2016-11-09 12:21:18

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

This driver enables Thunderbolt Networking on non-Apple platforms
running Linux.

Thunderbolt Networking provides peer-to-peer connections to transfer
files between computers, perform PC migrations, and/or set up small
workgroups with shared storage.

This is a virtual connection that emulates an Ethernet adapter that
enables Ethernet networking with the benefit of Thunderbolt superfast
medium capability.

Thunderbolt Networking enables two hosts and several devices that
have a Thunderbolt controller to be connected together in a linear
(Daisy chain) series from a single port.

Thunderbolt Networking for Linux is compatible with Thunderbolt
Networking on systems running macOS or Windows and also supports
Thunderbolt generation 2 and 3 controllers.

Note that all pre-existing Thunderbolt generation 3 features, such as
USB, Display and other Thunderbolt device connectivity will continue
to function exactly as they did prior to enabling Thunderbolt Networking.

Code and Software Specifications:
This kernel code creates a virtual ethernet device for computer to
computer communication over a Thunderbolt cable.
The new driver is a separate driver to the existing Thunderbolt driver.
It is designed to work on systems running Linux that
interface with Intel Connection Manager (ICM) firmware based
Thunderbolt controllers that support Thunderbolt Networking.
The kernel code operates in coordination with the Thunderbolt user-
space daemon to implement full Thunderbolt networking functionality.

Hardware Specifications:
Thunderbolt Hardware specs have not yet been published but are used
where necessary for register definitions.

Acked-by: Andreas Noever <[email protected]>
Tested-by: Mario Limonciello <[email protected]>

Changes since v8:
- Added support for more Thunderbolt device IDs

These patches were pushed to GitHub where they can be reviewed more
comfortably with green/red highlighting:
https://github.com/01org/thunderbolt-software-kernel-tree

Daemon code:
https://github.com/01org/thunderbolt-software-daemon

For reference, here's a link to version 8:
[v8]: https://lkml.org/lkml/2016/9/28/378

Amir Levy (8):
thunderbolt: Macro rename
thunderbolt: Updating the register definitions
thunderbolt: Communication with the ICM (firmware)
thunderbolt: Networking state machine
thunderbolt: Networking transmit and receive
thunderbolt: Kconfig for Thunderbolt Networking
thunderbolt: Networking doc
thunderbolt: Adding maintainer entry

Documentation/00-INDEX | 2 +
Documentation/thunderbolt/networking.txt | 132 ++
MAINTAINERS | 8 +-
drivers/thunderbolt/Kconfig | 27 +-
drivers/thunderbolt/Makefile | 3 +-
drivers/thunderbolt/icm/Makefile | 2 +
drivers/thunderbolt/icm/icm_nhi.c | 1520 ++++++++++++++++++++
drivers/thunderbolt/icm/icm_nhi.h | 85 ++
drivers/thunderbolt/icm/net.c | 2254 ++++++++++++++++++++++++++++++
drivers/thunderbolt/icm/net.h | 287 ++++
drivers/thunderbolt/nhi_regs.h | 115 +-
11 files changed, 4426 insertions(+), 9 deletions(-)
create mode 100644 Documentation/thunderbolt/networking.txt
create mode 100644 drivers/thunderbolt/icm/Makefile
create mode 100644 drivers/thunderbolt/icm/icm_nhi.c
create mode 100644 drivers/thunderbolt/icm/icm_nhi.h
create mode 100644 drivers/thunderbolt/icm/net.c
create mode 100644 drivers/thunderbolt/icm/net.h

--
2.7.4


2016-11-09 12:20:55

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 2/8] thunderbolt: Updating the register definitions

Adding more Thunderbolt(TM) register definitions
and some helper macros.

Signed-off-by: Amir Levy <[email protected]>
---
drivers/thunderbolt/nhi_regs.h | 109 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 109 insertions(+)

diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
index 75cf069..b8e961f 100644
--- a/drivers/thunderbolt/nhi_regs.h
+++ b/drivers/thunderbolt/nhi_regs.h
@@ -9,6 +9,11 @@

#include <linux/types.h>

+#define NHI_MMIO_BAR 0
+
+#define TBT_RING_MIN_NUM_BUFFERS 2
+#define TBT_RING_MAX_FRAME_SIZE (4 * 1024)
+
enum ring_flags {
RING_FLAG_ISOCH_ENABLE = 1 << 27, /* TX only? */
RING_FLAG_E2E_FLOW_CONTROL = 1 << 28,
@@ -39,6 +44,33 @@ struct ring_desc {
u32 time; /* write zero */
} __packed;

+/**
+ * struct tbt_buf_desc - TX/RX ring buffer descriptor.
+ * This is same as struct ring_desc, but without the use of bitfields and
+ * with explicit endianity.
+ */
+struct tbt_buf_desc {
+ __le64 phys;
+ __le32 attributes;
+ __le32 time;
+};
+
+#define DESC_ATTR_LEN_SHIFT 0
+#define DESC_ATTR_LEN_MASK GENMASK(11, DESC_ATTR_LEN_SHIFT)
+#define DESC_ATTR_EOF_SHIFT 12
+#define DESC_ATTR_EOF_MASK GENMASK(15, DESC_ATTR_EOF_SHIFT)
+#define DESC_ATTR_SOF_SHIFT 16
+#define DESC_ATTR_SOF_MASK GENMASK(19, DESC_ATTR_SOF_SHIFT)
+#define DESC_ATTR_TX_ISOCH_DMA_EN BIT(20) /* TX */
+#define DESC_ATTR_RX_CRC_ERR BIT(20) /* RX after use */
+#define DESC_ATTR_DESC_DONE BIT(21)
+#define DESC_ATTR_REQ_STS BIT(22) /* TX and RX before use */
+#define DESC_ATTR_RX_BUF_OVRN_ERR BIT(22) /* RX after use */
+#define DESC_ATTR_INT_EN BIT(23)
+#define DESC_ATTR_OFFSET_SHIFT 24
+#define DESC_ATTR_OFFSET_MASK GENMASK(31, DESC_ATTR_OFFSET_SHIFT)
+
+
/* NHI registers in bar 0 */

/*
@@ -60,6 +92,30 @@ struct ring_desc {
*/
#define REG_RX_RING_BASE 0x08000

+#define REG_RING_STEP 16
+#define REG_RING_PHYS_LO_OFFSET 0
+#define REG_RING_PHYS_HI_OFFSET 4
+#define REG_RING_CONS_PROD_OFFSET 8 /* cons - RO, prod - RW */
+#define REG_RING_CONS_SHIFT 0
+#define REG_RING_CONS_MASK GENMASK(15, REG_RING_CONS_SHIFT)
+#define REG_RING_PROD_SHIFT 16
+#define REG_RING_PROD_MASK GENMASK(31, REG_RING_PROD_SHIFT)
+#define REG_RING_SIZE_OFFSET 12
+#define REG_RING_SIZE_SHIFT 0
+#define REG_RING_SIZE_MASK GENMASK(15, REG_RING_SIZE_SHIFT)
+#define REG_RING_BUF_SIZE_SHIFT 16
+#define REG_RING_BUF_SIZE_MASK GENMASK(27, REG_RING_BUF_SIZE_SHIFT)
+
+#define TBT_RING_CONS_PROD_REG(iobase, ringbase, ringnumber) \
+ ((iobase) + (ringbase) + \
+ ((ringnumber) * REG_RING_STEP) + \
+ REG_RING_CONS_PROD_OFFSET)
+
+#define TBT_REG_RING_PROD_EXTRACT(val) (((val) & REG_RING_PROD_MASK) >> \
+ REG_RING_PROD_SHIFT)
+
+#define TBT_REG_RING_CONS_EXTRACT(val) (((val) & REG_RING_CONS_MASK) >> \
+ REG_RING_CONS_SHIFT)
/*
* 32 bytes per entry, one entry for every hop (REG_HOP_COUNT)
* 00: enum_ring_flags
@@ -77,6 +133,19 @@ struct ring_desc {
* ..: unknown
*/
#define REG_RX_OPTIONS_BASE 0x29800
+#define REG_RX_OPTS_TX_E2E_HOP_ID_SHIFT 12
+#define REG_RX_OPTS_TX_E2E_HOP_ID_MASK \
+ GENMASK(22, REG_RX_OPTS_TX_E2E_HOP_ID_SHIFT)
+#define REG_RX_OPTS_MASK_OFFSET 4
+#define REG_RX_OPTS_MASK_EOF_SHIFT 0
+#define REG_RX_OPTS_MASK_EOF_MASK GENMASK(15, REG_RX_OPTS_MASK_EOF_SHIFT)
+#define REG_RX_OPTS_MASK_SOF_SHIFT 16
+#define REG_RX_OPTS_MASK_SOF_MASK GENMASK(31, REG_RX_OPTS_MASK_SOF_SHIFT)
+
+#define REG_OPTS_STEP 32
+#define REG_OPTS_E2E_EN BIT(28)
+#define REG_OPTS_RAW BIT(30)
+#define REG_OPTS_VALID BIT(31)

/*
* three bitfields: tx, rx, rx overflow
@@ -86,6 +155,7 @@ struct ring_desc {
*/
#define REG_RING_NOTIFY_BASE 0x37800
#define RING_NOTIFY_REG_COUNT(nhi) ((31 + 3 * nhi->hop_count) / 32)
+#define REG_RING_NOTIFY_STEP 4

/*
* two bitfields: rx, tx
@@ -94,8 +164,47 @@ struct ring_desc {
*/
#define REG_RING_INTERRUPT_BASE 0x38200
#define RING_INTERRUPT_REG_COUNT(nhi) ((31 + 2 * nhi->hop_count) / 32)
+#define REG_RING_INT_TX_PROCESSED(ring_num) BIT(ring_num)
+#define REG_RING_INT_RX_PROCESSED(ring_num, num_paths) BIT((ring_num) + \
+ (num_paths))
+#define RING_INT_DISABLE(base, val) iowrite32( \
+ ioread32((base) + REG_RING_INTERRUPT_BASE) & ~(val), \
+ (base) + REG_RING_INTERRUPT_BASE)
+#define RING_INT_ENABLE(base, val) iowrite32( \
+ ioread32((base) + REG_RING_INTERRUPT_BASE) | (val), \
+ (base) + REG_RING_INTERRUPT_BASE)
+#define RING_INT_DISABLE_TX(base, ring_num) \
+ RING_INT_DISABLE(base, REG_RING_INT_TX_PROCESSED(ring_num))
+#define RING_INT_DISABLE_RX(base, ring_num, num_paths) \
+ RING_INT_DISABLE(base, REG_RING_INT_RX_PROCESSED(ring_num, num_paths))
+#define RING_INT_ENABLE_TX(base, ring_num) \
+ RING_INT_ENABLE(base, REG_RING_INT_TX_PROCESSED(ring_num))
+#define RING_INT_ENABLE_RX(base, ring_num, num_paths) \
+ RING_INT_ENABLE(base, REG_RING_INT_RX_PROCESSED(ring_num, num_paths))
+#define RING_INT_DISABLE_TX_RX(base, ring_num, num_paths) \
+ RING_INT_DISABLE(base, REG_RING_INT_TX_PROCESSED(ring_num) | \
+ REG_RING_INT_RX_PROCESSED(ring_num, num_paths))
+
+#define REG_RING_INTERRUPT_STEP 4
+
+#define REG_INT_THROTTLING_RATE 0x38c00
+#define REG_INT_THROTTLING_RATE_STEP 4
+#define NUM_INT_VECTORS 16
+
+#define REG_INT_VEC_ALLOC_BASE 0x38c40
+#define REG_INT_VEC_ALLOC_STEP 4
+#define REG_INT_VEC_ALLOC_FIELD_BITS 4
+#define REG_INT_VEC_ALLOC_FIELD_MASK (BIT(REG_INT_VEC_ALLOC_FIELD_BITS) - 1)
+#define REG_INT_VEC_ALLOC_PER_REG ((BITS_PER_BYTE * sizeof(u32)) / \
+ REG_INT_VEC_ALLOC_FIELD_BITS)

/* The last 11 bits contain the number of hops supported by the NHI port. */
#define REG_HOP_COUNT 0x39640
+#define REG_HOP_COUNT_TOTAL_PATHS_MASK GENMASK(10, 0)
+
+#define REG_HOST_INTERFACE_RST 0x39858
+
+#define REG_DMA_MISC 0x39864
+#define REG_DMA_MISC_INT_AUTO_CLEAR BIT(2)

#endif
--
2.7.4

2016-11-09 12:21:02

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 3/8] thunderbolt: Communication with the ICM (firmware)

This patch provides the communication protocol between the
Intel Connection Manager(ICM) firmware that is operational in the
Thunderbolt controller in non-Apple hardware.
The ICM firmware-based controller is used for establishing and maintaining
the Thunderbolt Networking connection - we need to be able to communicate
with it.

Signed-off-by: Amir Levy <[email protected]>
---
drivers/thunderbolt/icm/Makefile | 2 +
drivers/thunderbolt/icm/icm_nhi.c | 1257 +++++++++++++++++++++++++++++++++++++
drivers/thunderbolt/icm/icm_nhi.h | 85 +++
drivers/thunderbolt/icm/net.h | 217 +++++++
4 files changed, 1561 insertions(+)
create mode 100644 drivers/thunderbolt/icm/Makefile
create mode 100644 drivers/thunderbolt/icm/icm_nhi.c
create mode 100644 drivers/thunderbolt/icm/icm_nhi.h
create mode 100644 drivers/thunderbolt/icm/net.h

diff --git a/drivers/thunderbolt/icm/Makefile b/drivers/thunderbolt/icm/Makefile
new file mode 100644
index 0000000..f0d0fbb
--- /dev/null
+++ b/drivers/thunderbolt/icm/Makefile
@@ -0,0 +1,2 @@
+obj-${CONFIG_THUNDERBOLT_ICM} += thunderbolt-icm.o
+thunderbolt-icm-objs := icm_nhi.o
diff --git a/drivers/thunderbolt/icm/icm_nhi.c b/drivers/thunderbolt/icm/icm_nhi.c
new file mode 100644
index 0000000..c843ce8
--- /dev/null
+++ b/drivers/thunderbolt/icm/icm_nhi.c
@@ -0,0 +1,1257 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ ******************************************************************************/
+
+#include <linux/printk.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include "icm_nhi.h"
+#include "net.h"
+
+#define NHI_GENL_VERSION 1
+#define NHI_GENL_NAME "thunderbolt"
+
+#define DEVICE_DATA(num_ports, dma_port, nvm_ver_offset, nvm_auth_on_boot,\
+ support_full_e2e) \
+ ((num_ports) | ((dma_port) << 4) | ((nvm_ver_offset) << 10) | \
+ ((nvm_auth_on_boot) << 22) | ((support_full_e2e) << 23))
+#define DEVICE_DATA_NUM_PORTS(device_data) ((device_data) & 0xf)
+#define DEVICE_DATA_DMA_PORT(device_data) (((device_data) >> 4) & 0x3f)
+#define DEVICE_DATA_NVM_VER_OFFSET(device_data) (((device_data) >> 10) & 0xfff)
+#define DEVICE_DATA_NVM_AUTH_ON_BOOT(device_data) (((device_data) >> 22) & 0x1)
+#define DEVICE_DATA_SUPPORT_FULL_E2E(device_data) (((device_data) >> 23) & 0x1)
+
+#define USEC_TO_256_NSECS(usec) DIV_ROUND_UP((usec) * NSEC_PER_USEC, 256)
+
+/* NHI genetlink commands */
+enum {
+ NHI_CMD_UNSPEC,
+ NHI_CMD_SUBSCRIBE,
+ NHI_CMD_UNSUBSCRIBE,
+ NHI_CMD_QUERY_INFORMATION,
+ NHI_CMD_MSG_TO_ICM,
+ NHI_CMD_MSG_FROM_ICM,
+ NHI_CMD_MAILBOX,
+ NHI_CMD_APPROVE_TBT_NETWORKING,
+ NHI_CMD_ICM_IN_SAFE_MODE,
+ __NHI_CMD_MAX,
+};
+#define NHI_CMD_MAX (__NHI_CMD_MAX - 1)
+
+/* NHI genetlink policy */
+static const struct nla_policy nhi_genl_policy[NHI_ATTR_MAX + 1] = {
+ [NHI_ATTR_DRV_VERSION] = { .type = NLA_NUL_STRING, },
+ [NHI_ATTR_NVM_VER_OFFSET] = { .type = NLA_U16, },
+ [NHI_ATTR_NUM_PORTS] = { .type = NLA_U8, },
+ [NHI_ATTR_DMA_PORT] = { .type = NLA_U8, },
+ [NHI_ATTR_SUPPORT_FULL_E2E] = { .type = NLA_FLAG, },
+ [NHI_ATTR_MAILBOX_CMD] = { .type = NLA_U32, },
+ [NHI_ATTR_PDF] = { .type = NLA_U32, },
+ [NHI_ATTR_MSG_TO_ICM] = { .type = NLA_BINARY,
+ .len = TBT_ICM_RING_MAX_FRAME_SIZE },
+ [NHI_ATTR_MSG_FROM_ICM] = { .type = NLA_BINARY,
+ .len = TBT_ICM_RING_MAX_FRAME_SIZE },
+};
+
+/* NHI genetlink family */
+static struct genl_family nhi_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = FIELD_SIZEOF(struct tbt_nhi_ctxt, id),
+ .name = NHI_GENL_NAME,
+ .version = NHI_GENL_VERSION,
+ .maxattr = NHI_ATTR_MAX,
+};
+
+static LIST_HEAD(controllers_list);
+static DEFINE_MUTEX(controllers_list_mutex);
+static atomic_t subscribers = ATOMIC_INIT(0);
+/*
+ * Some of the received generic netlink messages are replied in a different
+ * context. The reply has to include the netlink portid of sender, therefore
+ * saving it in global variable (current assuption is one sender).
+ */
+static u32 portid;
+
+static bool nhi_nvm_authenticated(struct tbt_nhi_ctxt *nhi_ctxt)
+{
+ enum icm_operation_mode op_mode;
+ u32 *msg_head, port_id, reg;
+ struct sk_buff *skb;
+ int i;
+
+ if (!nhi_ctxt->nvm_auth_on_boot)
+ return true;
+
+ /*
+ * The check for NVM authentication can take time for iCM,
+ * especially in low power configuration.
+ */
+ for (i = 0; i < 5; i++) {
+ u32 status = ioread32(nhi_ctxt->iobase + REG_FW_STS);
+
+ if (status & REG_FW_STS_NVM_AUTH_DONE)
+ break;
+
+ msleep(30);
+ }
+ /*
+ * The check for authentication is done after checking if iCM
+ * is present so it shouldn't reach the max tries (=5).
+ * Anyway, the check for full functionality below covers the error case.
+ */
+ reg = ioread32(nhi_ctxt->iobase + REG_OUTMAIL_CMD);
+ op_mode = (reg & REG_OUTMAIL_CMD_OP_MODE_MASK) >>
+ REG_OUTMAIL_CMD_OP_MODE_SHIFT;
+ if (op_mode == FULL_FUNCTIONALITY)
+ return true;
+
+ dev_warn(&nhi_ctxt->pdev->dev, "controller id %#x is in operation mode %#x status %#lx, NVM image update might be required\n",
+ nhi_ctxt->id, op_mode,
+ (reg & REG_OUTMAIL_CMD_STS_MASK)>>REG_OUTMAIL_CMD_STS_SHIFT);
+
+ skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize), GFP_KERNEL);
+ if (!skb) {
+ dev_err(&nhi_ctxt->pdev->dev, "genlmsg_new failed: not enough memory to send controller operational mode\n");
+ return false;
+ }
+
+ /* keeping port_id into a local variable for next use */
+ port_id = portid;
+ msg_head = genlmsg_put(skb, port_id, 0, &nhi_genl_family, 0,
+ NHI_CMD_ICM_IN_SAFE_MODE);
+ if (!msg_head) {
+ nlmsg_free(skb);
+ dev_err(&nhi_ctxt->pdev->dev, "genlmsg_put failed: not enough memory to send controller operational mode\n");
+ return false;
+ }
+
+ *msg_head = nhi_ctxt->id;
+
+ genlmsg_end(skb, msg_head);
+
+ genlmsg_unicast(&init_net, skb, port_id);
+
+ return false;
+}
+
+int nhi_send_message(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+ u32 msg_len, const void *msg, bool ignore_icm_resp)
+{
+ u32 prod_cons, prod, cons, attr;
+ struct tbt_icm_ring_shared_memory *shared_mem;
+ void __iomem *reg = TBT_RING_CONS_PROD_REG(nhi_ctxt->iobase,
+ REG_TX_RING_BASE,
+ TBT_ICM_RING_NUM);
+
+ if (nhi_ctxt->d0_exit)
+ return -ENODEV;
+
+ prod_cons = ioread32(reg);
+ prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+ cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+ if (prod >= TBT_ICM_RING_NUM_TX_BUFS) {
+ dev_warn(&nhi_ctxt->pdev->dev,
+ "controller id %#x is not functional, producer %u out of range\n",
+ nhi_ctxt->id, prod);
+ return -ENODEV;
+ }
+ if (TBT_TX_RING_FULL(prod, cons, TBT_ICM_RING_NUM_TX_BUFS)) {
+ dev_err(&nhi_ctxt->pdev->dev,
+ "controller id %#x is not functional, TX ring full\n",
+ nhi_ctxt->id);
+ return -ENOSPC;
+ }
+
+ attr = (msg_len << DESC_ATTR_LEN_SHIFT) & DESC_ATTR_LEN_MASK;
+ attr |= (pdf << DESC_ATTR_EOF_SHIFT) & DESC_ATTR_EOF_MASK;
+
+ shared_mem = nhi_ctxt->icm_ring_shared_mem;
+ shared_mem->tx_buf_desc[prod].attributes = cpu_to_le32(attr);
+
+ memcpy(shared_mem->tx_buf[prod], msg, msg_len);
+
+ prod_cons &= ~REG_RING_PROD_MASK;
+ prod_cons |= (((prod + 1) % TBT_ICM_RING_NUM_TX_BUFS) <<
+ REG_RING_PROD_SHIFT) & REG_RING_PROD_MASK;
+
+ nhi_ctxt->wait_for_icm_resp = true;
+ nhi_ctxt->ignore_icm_resp = ignore_icm_resp;
+
+ iowrite32(prod_cons, reg);
+
+ return 0;
+}
+
+static int nhi_send_driver_ready_command(struct tbt_nhi_ctxt *nhi_ctxt)
+{
+ struct driver_ready_command {
+ __be32 req_code;
+ __be32 crc;
+ } drv_rdy_cmd = {
+ .req_code = cpu_to_be32(CC_DRV_READY),
+ };
+ u32 crc32;
+
+ crc32 = __crc32c_le(~0, (unsigned char const *)&drv_rdy_cmd,
+ offsetof(struct driver_ready_command, crc));
+
+ drv_rdy_cmd.crc = cpu_to_be32(~crc32);
+
+ return nhi_send_message(nhi_ctxt, PDF_SW_TO_FW_COMMAND,
+ sizeof(drv_rdy_cmd), &drv_rdy_cmd, false);
+}
+
+/**
+ * nhi_search_ctxt - search by id the controllers_list.
+ * Should be called under controllers_list_mutex.
+ *
+ * @id: id of the controller
+ *
+ * Return: driver context if found, NULL otherwise.
+ */
+static struct tbt_nhi_ctxt *nhi_search_ctxt(u32 id)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+
+ list_for_each_entry(nhi_ctxt, &controllers_list, node)
+ if (nhi_ctxt->id == id)
+ return nhi_ctxt;
+
+ return NULL;
+}
+
+static int nhi_genl_subscribe(__always_unused struct sk_buff *u_skb,
+ struct genl_info *info)
+ __acquires(&nhi_ctxt->send_sem)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+
+ /*
+ * To send driver ready command to iCM, need at least one subscriber
+ * that will handle the response.
+ * Currently the assumption is one user mode daemon as subscriber
+ * so one portid global variable (without locking).
+ */
+ if (atomic_inc_return(&subscribers) >= 1) {
+ portid = info->snd_portid;
+ if (mutex_lock_interruptible(&controllers_list_mutex)) {
+ atomic_dec_if_positive(&subscribers);
+ return -ERESTART;
+ }
+ list_for_each_entry(nhi_ctxt, &controllers_list, node) {
+ int res;
+
+ if (nhi_ctxt->d0_exit ||
+ !nhi_nvm_authenticated(nhi_ctxt))
+ continue;
+
+ res = down_timeout(&nhi_ctxt->send_sem,
+ msecs_to_jiffies(10*MSEC_PER_SEC));
+ if (res) {
+ dev_err(&nhi_ctxt->pdev->dev,
+ "%s: controller id %#x is not functional, timeout on waiting for FW response to previous message\n",
+ __func__, nhi_ctxt->id);
+ continue;
+ }
+
+ if (!mutex_trylock(&nhi_ctxt->d0_exit_send_mutex)) {
+ up(&nhi_ctxt->send_sem);
+ continue;
+ }
+
+ res = nhi_send_driver_ready_command(nhi_ctxt);
+
+ mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+ if (res)
+ up(&nhi_ctxt->send_sem);
+ }
+ mutex_unlock(&controllers_list_mutex);
+ }
+
+ return 0;
+}
+
+static int nhi_genl_unsubscribe(__always_unused struct sk_buff *u_skb,
+ __always_unused struct genl_info *info)
+{
+ atomic_dec_if_positive(&subscribers);
+
+ return 0;
+}
+
+static int nhi_genl_query_information(__always_unused struct sk_buff *u_skb,
+ struct genl_info *info)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ struct sk_buff *skb;
+ bool msg_too_long;
+ int res = -ENODEV;
+ u32 *msg_head;
+
+ if (!info || !info->userhdr)
+ return -EINVAL;
+
+ skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize) +
+ nla_total_size(sizeof(DRV_VERSION)) +
+ nla_total_size(sizeof(nhi_ctxt->nvm_ver_offset)) +
+ nla_total_size(sizeof(nhi_ctxt->num_ports)) +
+ nla_total_size(sizeof(nhi_ctxt->dma_port)) +
+ nla_total_size(0), /* nhi_ctxt->support_full_e2e */
+ GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ msg_head = genlmsg_put_reply(skb, info, &nhi_genl_family, 0,
+ NHI_CMD_QUERY_INFORMATION);
+ if (!msg_head) {
+ res = -ENOMEM;
+ goto genl_put_reply_failure;
+ }
+
+ if (mutex_lock_interruptible(&controllers_list_mutex)) {
+ res = -ERESTART;
+ goto genl_put_reply_failure;
+ }
+
+ nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+ if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+ *msg_head = nhi_ctxt->id;
+
+ msg_too_long = !!nla_put_string(skb, NHI_ATTR_DRV_VERSION,
+ DRV_VERSION);
+
+ msg_too_long = msg_too_long ||
+ nla_put_u16(skb, NHI_ATTR_NVM_VER_OFFSET,
+ nhi_ctxt->nvm_ver_offset);
+
+ msg_too_long = msg_too_long ||
+ nla_put_u8(skb, NHI_ATTR_NUM_PORTS,
+ nhi_ctxt->num_ports);
+
+ msg_too_long = msg_too_long ||
+ nla_put_u8(skb, NHI_ATTR_DMA_PORT,
+ nhi_ctxt->dma_port);
+
+ if (msg_too_long) {
+ res = -EMSGSIZE;
+ goto release_ctl_list_lock;
+ }
+
+ if (nhi_ctxt->support_full_e2e &&
+ nla_put_flag(skb, NHI_ATTR_SUPPORT_FULL_E2E)) {
+ res = -EMSGSIZE;
+ goto release_ctl_list_lock;
+ }
+ mutex_unlock(&controllers_list_mutex);
+
+ genlmsg_end(skb, msg_head);
+
+ return genlmsg_reply(skb, info);
+ }
+
+release_ctl_list_lock:
+ mutex_unlock(&controllers_list_mutex);
+ genlmsg_cancel(skb, msg_head);
+
+genl_put_reply_failure:
+ nlmsg_free(skb);
+
+ return res;
+}
+
+static int nhi_genl_msg_to_icm(__always_unused struct sk_buff *u_skb,
+ struct genl_info *info)
+ __acquires(&nhi_ctxt->send_sem)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ int res = -ENODEV;
+ int msg_len;
+ void *msg;
+
+ if (!info || !info->userhdr || !info->attrs ||
+ !info->attrs[NHI_ATTR_PDF] || !info->attrs[NHI_ATTR_MSG_TO_ICM])
+ return -EINVAL;
+
+ msg_len = nla_len(info->attrs[NHI_ATTR_MSG_TO_ICM]);
+ if (msg_len > TBT_ICM_RING_MAX_FRAME_SIZE)
+ return -ENOBUFS;
+
+ msg = nla_data(info->attrs[NHI_ATTR_MSG_TO_ICM]);
+
+ if (mutex_lock_interruptible(&controllers_list_mutex))
+ return -ERESTART;
+
+ nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+ if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+ /*
+ * waiting 10 seconds to receive a FW response
+ * if not, just give up and pop up an error
+ */
+ res = down_timeout(&nhi_ctxt->send_sem,
+ msecs_to_jiffies(10 * MSEC_PER_SEC));
+ if (res) {
+ void __iomem *rx_prod_cons = TBT_RING_CONS_PROD_REG(
+ nhi_ctxt->iobase,
+ REG_RX_RING_BASE,
+ TBT_ICM_RING_NUM);
+ void __iomem *tx_prod_cons = TBT_RING_CONS_PROD_REG(
+ nhi_ctxt->iobase,
+ REG_TX_RING_BASE,
+ TBT_ICM_RING_NUM);
+ dev_err(&nhi_ctxt->pdev->dev,
+ "%s: controller id %#x is not functional, timeout on waiting for FW response to previous message, tx prod&cons=%#x, rx prod&cons=%#x\n",
+ __func__, nhi_ctxt->id, ioread32(tx_prod_cons),
+ ioread32(rx_prod_cons));
+ goto release_ctl_list_lock;
+ }
+
+ if (!mutex_trylock(&nhi_ctxt->d0_exit_send_mutex)) {
+ up(&nhi_ctxt->send_sem);
+ goto release_ctl_list_lock;
+ }
+
+ mutex_unlock(&controllers_list_mutex);
+
+ res = nhi_send_message(nhi_ctxt,
+ nla_get_u32(info->attrs[NHI_ATTR_PDF]),
+ msg_len, msg, false);
+
+ mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+ if (res)
+ up(&nhi_ctxt->send_sem);
+
+ return res;
+ }
+
+release_ctl_list_lock:
+ mutex_unlock(&controllers_list_mutex);
+ return res;
+}
+
+int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit)
+{
+ u32 delay = deinit ? U32_C(20) : U32_C(100);
+ int i;
+
+ iowrite32(data, nhi_ctxt->iobase + REG_INMAIL_DATA);
+ iowrite32(cmd, nhi_ctxt->iobase + REG_INMAIL_CMD);
+
+#define NHI_INMAIL_CMD_RETRIES 50
+ /*
+ * READ_ONCE fetches the value of nhi_ctxt->d0_exit every time
+ * and avoid optimization.
+ * deinit = true to continue the loop even if D3 process has been
+ * carried out.
+ */
+ for (i = 0; (i < NHI_INMAIL_CMD_RETRIES) &&
+ (deinit || !READ_ONCE(nhi_ctxt->d0_exit)); i++) {
+ cmd = ioread32(nhi_ctxt->iobase + REG_INMAIL_CMD);
+
+ if (cmd & REG_INMAIL_CMD_ERROR)
+ return -EIO;
+
+ if (!(cmd & REG_INMAIL_CMD_REQUEST))
+ break;
+
+ msleep(delay);
+ }
+
+ if (i == NHI_INMAIL_CMD_RETRIES) {
+ if (!deinit)
+ dev_err(&nhi_ctxt->pdev->dev,
+ "controller id %#x is not functional, inmail timeout\n",
+ nhi_ctxt->id);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int nhi_mailbox_generic(struct tbt_nhi_ctxt *nhi_ctxt, u32 mb_cmd)
+ __releases(&controllers_list_mutex)
+{
+ int res = -ENODEV;
+
+ if (mutex_lock_interruptible(&nhi_ctxt->mailbox_mutex)) {
+ res = -ERESTART;
+ goto release_ctl_list_lock;
+ }
+
+ if (!mutex_trylock(&nhi_ctxt->d0_exit_mailbox_mutex)) {
+ mutex_unlock(&nhi_ctxt->mailbox_mutex);
+ goto release_ctl_list_lock;
+ }
+
+ mutex_unlock(&controllers_list_mutex);
+
+ res = nhi_mailbox(nhi_ctxt, mb_cmd, 0, false);
+ mutex_unlock(&nhi_ctxt->d0_exit_mailbox_mutex);
+ mutex_unlock(&nhi_ctxt->mailbox_mutex);
+
+ return res;
+
+release_ctl_list_lock:
+ mutex_unlock(&controllers_list_mutex);
+ return res;
+}
+
+static int nhi_genl_mailbox(__always_unused struct sk_buff *u_skb,
+ struct genl_info *info)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ u32 cmd, mb_cmd;
+
+ if (!info || !info->userhdr || !info->attrs ||
+ !info->attrs[NHI_ATTR_MAILBOX_CMD])
+ return -EINVAL;
+
+ cmd = nla_get_u32(info->attrs[NHI_ATTR_MAILBOX_CMD]);
+ mb_cmd = ((cmd << REG_INMAIL_CMD_CMD_SHIFT) &
+ REG_INMAIL_CMD_CMD_MASK) | REG_INMAIL_CMD_REQUEST;
+
+ if (mutex_lock_interruptible(&controllers_list_mutex))
+ return -ERESTART;
+
+ nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+ if (nhi_ctxt && !nhi_ctxt->d0_exit)
+ return nhi_mailbox_generic(nhi_ctxt, mb_cmd);
+
+ mutex_unlock(&controllers_list_mutex);
+ return -ENODEV;
+}
+
+
+static int nhi_genl_send_msg(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+ const u8 *msg, u32 msg_len)
+{
+ u32 *msg_head, port_id;
+ struct sk_buff *skb;
+ int res;
+
+ if (atomic_read(&subscribers) < 1)
+ return -ENOTCONN;
+
+ skb = genlmsg_new(NLMSG_ALIGN(nhi_genl_family.hdrsize) +
+ nla_total_size(msg_len) +
+ nla_total_size(sizeof(pdf)),
+ GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ port_id = portid;
+ msg_head = genlmsg_put(skb, port_id, 0, &nhi_genl_family, 0,
+ NHI_CMD_MSG_FROM_ICM);
+ if (!msg_head) {
+ res = -ENOMEM;
+ goto genl_put_reply_failure;
+ }
+
+ *msg_head = nhi_ctxt->id;
+
+ if (nla_put_u32(skb, NHI_ATTR_PDF, pdf) ||
+ nla_put(skb, NHI_ATTR_MSG_FROM_ICM, msg_len, msg)) {
+ res = -EMSGSIZE;
+ goto nla_put_failure;
+ }
+
+ genlmsg_end(skb, msg_head);
+
+ return genlmsg_unicast(&init_net, skb, port_id);
+
+nla_put_failure:
+ genlmsg_cancel(skb, msg_head);
+genl_put_reply_failure:
+ nlmsg_free(skb);
+
+ return res;
+}
+
+static bool nhi_msg_from_icm_analysis(struct tbt_nhi_ctxt *nhi_ctxt,
+ enum pdf_value pdf,
+ const u8 *msg, u32 msg_len)
+{
+ /*
+ * preparation for messages that won't be sent,
+ * currently unused in this patch.
+ */
+ bool send_event = true;
+
+ switch (pdf) {
+ case PDF_ERROR_NOTIFICATION:
+ /* fallthrough */
+ case PDF_WRITE_CONFIGURATION_REGISTERS:
+ /* fallthrough */
+ case PDF_READ_CONFIGURATION_REGISTERS:
+ if (nhi_ctxt->wait_for_icm_resp) {
+ nhi_ctxt->wait_for_icm_resp = false;
+ up(&nhi_ctxt->send_sem);
+ }
+ /* fallthrough */
+ default:
+ break;
+ }
+
+ return send_event;
+}
+
+static void nhi_msgs_from_icm(struct work_struct *work)
+ __releases(&nhi_ctxt->send_sem)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt = container_of(work, typeof(*nhi_ctxt),
+ icm_msgs_work);
+ void __iomem *reg = TBT_RING_CONS_PROD_REG(nhi_ctxt->iobase,
+ REG_RX_RING_BASE,
+ TBT_ICM_RING_NUM);
+ u32 prod_cons, prod, cons;
+
+ prod_cons = ioread32(reg);
+ prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+ cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+ if (prod >= TBT_ICM_RING_NUM_RX_BUFS) {
+ dev_warn(&nhi_ctxt->pdev->dev,
+ "controller id %#x is not functional, producer %u out of range\n",
+ nhi_ctxt->id, prod);
+ return;
+ }
+ if (cons >= TBT_ICM_RING_NUM_RX_BUFS) {
+ dev_warn(&nhi_ctxt->pdev->dev,
+ "controller id %#x is not functional, consumer %u out of range\n",
+ nhi_ctxt->id, cons);
+ return;
+ }
+
+ while (!TBT_RX_RING_EMPTY(prod, cons, TBT_ICM_RING_NUM_RX_BUFS) &&
+ !nhi_ctxt->d0_exit) {
+ struct tbt_buf_desc *rx_desc;
+ u8 *msg;
+ u32 msg_len;
+ enum pdf_value pdf;
+ bool send_event;
+
+ cons = (cons + 1) % TBT_ICM_RING_NUM_RX_BUFS;
+ rx_desc = &(nhi_ctxt->icm_ring_shared_mem->rx_buf_desc[cons]);
+ if (!(le32_to_cpu(rx_desc->attributes) & DESC_ATTR_DESC_DONE))
+ usleep_range(10, 20);
+
+ rmb(); /* read the descriptor and the buffer after DD check */
+ pdf = (le32_to_cpu(rx_desc->attributes) & DESC_ATTR_EOF_MASK)
+ >> DESC_ATTR_EOF_SHIFT;
+ msg = nhi_ctxt->icm_ring_shared_mem->rx_buf[cons];
+ msg_len = (le32_to_cpu(rx_desc->attributes)&DESC_ATTR_LEN_MASK)
+ >> DESC_ATTR_LEN_SHIFT;
+
+ send_event = nhi_msg_from_icm_analysis(nhi_ctxt, pdf, msg,
+ msg_len);
+
+ if (send_event)
+ nhi_genl_send_msg(nhi_ctxt, pdf, msg, msg_len);
+
+ /* set the descriptor for another receive */
+ rx_desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS |
+ DESC_ATTR_INT_EN);
+ rx_desc->time = 0;
+ }
+
+ /* free the descriptors for more receive */
+ prod_cons &= ~REG_RING_CONS_MASK;
+ prod_cons |= (cons << REG_RING_CONS_SHIFT) & REG_RING_CONS_MASK;
+ iowrite32(prod_cons, reg);
+
+ if (!nhi_ctxt->d0_exit) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&nhi_ctxt->lock, flags);
+ /* enable RX interrupt */
+ RING_INT_ENABLE_RX(nhi_ctxt->iobase, TBT_ICM_RING_NUM,
+ nhi_ctxt->num_paths);
+
+ spin_unlock_irqrestore(&nhi_ctxt->lock, flags);
+ }
+}
+
+static irqreturn_t nhi_icm_ring_rx_msix(int __always_unused irq, void *data)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt = data;
+
+ spin_lock(&nhi_ctxt->lock);
+ /*
+ * disable RX interrupt
+ * We like to allow interrupt mitigation until the work item
+ * will be completed.
+ */
+ RING_INT_DISABLE_RX(nhi_ctxt->iobase, TBT_ICM_RING_NUM,
+ nhi_ctxt->num_paths);
+
+ spin_unlock(&nhi_ctxt->lock);
+
+ schedule_work(&nhi_ctxt->icm_msgs_work);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t nhi_msi(int __always_unused irq, void *data)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt = data;
+ u32 isr0, isr1, imr0, imr1;
+
+ /* clear on read */
+ isr0 = ioread32(nhi_ctxt->iobase + REG_RING_NOTIFY_BASE);
+ isr1 = ioread32(nhi_ctxt->iobase + REG_RING_NOTIFY_BASE +
+ REG_RING_NOTIFY_STEP);
+ if (unlikely(!isr0 && !isr1))
+ return IRQ_NONE;
+
+ spin_lock(&nhi_ctxt->lock);
+
+ imr0 = ioread32(nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+ imr1 = ioread32(nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE +
+ REG_RING_INTERRUPT_STEP);
+ /* disable the arrived interrupts */
+ iowrite32(imr0 & ~isr0,
+ nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+ iowrite32(imr1 & ~isr1,
+ nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE +
+ REG_RING_INTERRUPT_STEP);
+
+ spin_unlock(&nhi_ctxt->lock);
+
+ if (isr0 & REG_RING_INT_RX_PROCESSED(TBT_ICM_RING_NUM,
+ nhi_ctxt->num_paths))
+ schedule_work(&nhi_ctxt->icm_msgs_work);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * nhi_set_int_vec - Mapping of the MSIX vector entry to the ring
+ * @nhi_ctxt: contains data on NHI controller
+ * @path: ring to be mapped
+ * @msix_msg_id: msix entry to be mapped
+ */
+static inline void nhi_set_int_vec(struct tbt_nhi_ctxt *nhi_ctxt, u32 path,
+ u8 msix_msg_id)
+{
+ void __iomem *reg;
+ u32 step, shift, ivr;
+
+ if (msix_msg_id % 2)
+ path += nhi_ctxt->num_paths;
+
+ step = path / REG_INT_VEC_ALLOC_PER_REG;
+ shift = (path % REG_INT_VEC_ALLOC_PER_REG) *
+ REG_INT_VEC_ALLOC_FIELD_BITS;
+ reg = nhi_ctxt->iobase + REG_INT_VEC_ALLOC_BASE +
+ (step * REG_INT_VEC_ALLOC_STEP);
+ ivr = ioread32(reg) & ~(REG_INT_VEC_ALLOC_FIELD_MASK << shift);
+ iowrite32(ivr | (msix_msg_id << shift), reg);
+}
+
+/* NHI genetlink operations array */
+static const struct genl_ops nhi_ops[] = {
+ {
+ .cmd = NHI_CMD_SUBSCRIBE,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_subscribe,
+ },
+ {
+ .cmd = NHI_CMD_UNSUBSCRIBE,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_unsubscribe,
+ },
+ {
+ .cmd = NHI_CMD_QUERY_INFORMATION,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_query_information,
+ },
+ {
+ .cmd = NHI_CMD_MSG_TO_ICM,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_msg_to_icm,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = NHI_CMD_MAILBOX,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_mailbox,
+ .flags = GENL_ADMIN_PERM,
+ },
+};
+
+static int nhi_suspend(struct device *dev) __releases(&nhi_ctxt->send_sem)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(to_pci_dev(dev));
+ void __iomem *rx_reg, *tx_reg;
+ u32 rx_reg_val, tx_reg_val;
+
+ /* must be after negotiation_events, since messages might be sent */
+ nhi_ctxt->d0_exit = true;
+
+ rx_reg = nhi_ctxt->iobase + REG_RX_OPTIONS_BASE +
+ (TBT_ICM_RING_NUM * REG_OPTS_STEP);
+ rx_reg_val = ioread32(rx_reg) & ~REG_OPTS_E2E_EN;
+ tx_reg = nhi_ctxt->iobase + REG_TX_OPTIONS_BASE +
+ (TBT_ICM_RING_NUM * REG_OPTS_STEP);
+ tx_reg_val = ioread32(tx_reg) & ~REG_OPTS_E2E_EN;
+ /* disable RX flow control */
+ iowrite32(rx_reg_val, rx_reg);
+ /* disable TX flow control */
+ iowrite32(tx_reg_val, tx_reg);
+ /* disable RX ring */
+ iowrite32(rx_reg_val & ~REG_OPTS_VALID, rx_reg);
+
+ mutex_lock(&nhi_ctxt->d0_exit_mailbox_mutex);
+ mutex_lock(&nhi_ctxt->d0_exit_send_mutex);
+
+ cancel_work_sync(&nhi_ctxt->icm_msgs_work);
+
+ if (nhi_ctxt->wait_for_icm_resp) {
+ nhi_ctxt->wait_for_icm_resp = false;
+ nhi_ctxt->ignore_icm_resp = false;
+ /*
+ * if there is response, it is lost, so unlock the send
+ * for the next resume.
+ */
+ up(&nhi_ctxt->send_sem);
+ }
+
+ mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+ mutex_unlock(&nhi_ctxt->d0_exit_mailbox_mutex);
+
+ /* wait for all TX to finish */
+ usleep_range(5 * USEC_PER_MSEC, 7 * USEC_PER_MSEC);
+
+ /* disable all interrupts */
+ iowrite32(0, nhi_ctxt->iobase + REG_RING_INTERRUPT_BASE);
+ /* disable TX ring */
+ iowrite32(tx_reg_val & ~REG_OPTS_VALID, tx_reg);
+
+ return 0;
+}
+
+static int nhi_resume(struct device *dev) __acquires(&nhi_ctxt->send_sem)
+{
+ dma_addr_t phys;
+ struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(to_pci_dev(dev));
+ struct tbt_buf_desc *desc;
+ void __iomem *iobase = nhi_ctxt->iobase;
+ void __iomem *reg;
+ int i;
+
+ if (nhi_ctxt->msix_entries) {
+ iowrite32(ioread32(iobase + REG_DMA_MISC) |
+ REG_DMA_MISC_INT_AUTO_CLEAR,
+ iobase + REG_DMA_MISC);
+ /*
+ * Vector #0, which is TX complete to ICM,
+ * isn't been used currently.
+ */
+ nhi_set_int_vec(nhi_ctxt, 0, 1);
+
+ for (i = 2; i < nhi_ctxt->num_vectors; i++)
+ nhi_set_int_vec(nhi_ctxt, nhi_ctxt->num_paths - (i/2),
+ i);
+ }
+
+ /* configure TX descriptors */
+ for (i = 0, phys = nhi_ctxt->icm_ring_shared_mem_dma_addr;
+ i < TBT_ICM_RING_NUM_TX_BUFS;
+ i++, phys += TBT_ICM_RING_MAX_FRAME_SIZE) {
+ desc = &nhi_ctxt->icm_ring_shared_mem->tx_buf_desc[i];
+ desc->phys = cpu_to_le64(phys);
+ desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS);
+ }
+ /* configure RX descriptors */
+ for (i = 0;
+ i < TBT_ICM_RING_NUM_RX_BUFS;
+ i++, phys += TBT_ICM_RING_MAX_FRAME_SIZE) {
+ desc = &nhi_ctxt->icm_ring_shared_mem->rx_buf_desc[i];
+ desc->phys = cpu_to_le64(phys);
+ desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS |
+ DESC_ATTR_INT_EN);
+ }
+
+ /* configure throttling rate for interrupts */
+ for (i = 0, reg = iobase + REG_INT_THROTTLING_RATE;
+ i < NUM_INT_VECTORS;
+ i++, reg += REG_INT_THROTTLING_RATE_STEP) {
+ iowrite32(USEC_TO_256_NSECS(128), reg);
+ }
+
+ /* configure TX for ICM ring */
+ reg = iobase + REG_TX_RING_BASE + (TBT_ICM_RING_NUM * REG_RING_STEP);
+ phys = nhi_ctxt->icm_ring_shared_mem_dma_addr +
+ offsetof(struct tbt_icm_ring_shared_memory, tx_buf_desc);
+ iowrite32(lower_32_bits(phys), reg + REG_RING_PHYS_LO_OFFSET);
+ iowrite32(upper_32_bits(phys), reg + REG_RING_PHYS_HI_OFFSET);
+ iowrite32((TBT_ICM_RING_NUM_TX_BUFS << REG_RING_SIZE_SHIFT) &
+ REG_RING_SIZE_MASK,
+ reg + REG_RING_SIZE_OFFSET);
+
+ reg = iobase + REG_TX_OPTIONS_BASE + (TBT_ICM_RING_NUM*REG_OPTS_STEP);
+ iowrite32(REG_OPTS_RAW | REG_OPTS_VALID, reg);
+
+ /* configure RX for ICM ring */
+ reg = iobase + REG_RX_RING_BASE + (TBT_ICM_RING_NUM * REG_RING_STEP);
+ phys = nhi_ctxt->icm_ring_shared_mem_dma_addr +
+ offsetof(struct tbt_icm_ring_shared_memory, rx_buf_desc);
+ iowrite32(lower_32_bits(phys), reg + REG_RING_PHYS_LO_OFFSET);
+ iowrite32(upper_32_bits(phys), reg + REG_RING_PHYS_HI_OFFSET);
+ iowrite32(((TBT_ICM_RING_NUM_RX_BUFS << REG_RING_SIZE_SHIFT) &
+ REG_RING_SIZE_MASK) |
+ ((TBT_ICM_RING_MAX_FRAME_SIZE << REG_RING_BUF_SIZE_SHIFT) &
+ REG_RING_BUF_SIZE_MASK),
+ reg + REG_RING_SIZE_OFFSET);
+ iowrite32(((TBT_ICM_RING_NUM_RX_BUFS - 1) << REG_RING_CONS_SHIFT) &
+ REG_RING_CONS_MASK,
+ reg + REG_RING_CONS_PROD_OFFSET);
+
+ reg = iobase + REG_RX_OPTIONS_BASE + (TBT_ICM_RING_NUM*REG_OPTS_STEP);
+ iowrite32(REG_OPTS_RAW | REG_OPTS_VALID, reg);
+
+ /* enable RX interrupt */
+ RING_INT_ENABLE_RX(iobase, TBT_ICM_RING_NUM, nhi_ctxt->num_paths);
+
+ if (likely((atomic_read(&subscribers) > 0) &&
+ nhi_nvm_authenticated(nhi_ctxt))) {
+ down(&nhi_ctxt->send_sem);
+ nhi_ctxt->d0_exit = false;
+ mutex_lock(&nhi_ctxt->d0_exit_send_mutex);
+ /*
+ * interrupts are enabled here before send due to
+ * implicit barrier in mutex
+ */
+ nhi_send_driver_ready_command(nhi_ctxt);
+ mutex_unlock(&nhi_ctxt->d0_exit_send_mutex);
+ } else {
+ nhi_ctxt->d0_exit = false;
+ }
+
+ return 0;
+}
+
+static void icm_nhi_shutdown(struct pci_dev *pdev)
+{
+ nhi_suspend(&pdev->dev);
+}
+
+static void icm_nhi_remove(struct pci_dev *pdev)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(pdev);
+ int i;
+
+ nhi_suspend(&pdev->dev);
+
+ if (nhi_ctxt->net_workqueue)
+ destroy_workqueue(nhi_ctxt->net_workqueue);
+
+ /*
+ * disable irq for msix or msi
+ */
+ if (likely(nhi_ctxt->msix_entries)) {
+ /* Vector #0 isn't been used currently */
+ devm_free_irq(&pdev->dev, nhi_ctxt->msix_entries[1].vector,
+ nhi_ctxt);
+ pci_disable_msix(pdev);
+ } else {
+ devm_free_irq(&pdev->dev, pdev->irq, nhi_ctxt);
+ pci_disable_msi(pdev);
+ }
+
+ /*
+ * remove controller from the controllers list
+ */
+ mutex_lock(&controllers_list_mutex);
+ list_del(&nhi_ctxt->node);
+ mutex_unlock(&controllers_list_mutex);
+
+ nhi_mailbox(
+ nhi_ctxt,
+ ((CC_DRV_UNLOADS_AND_DISCONNECT_INTER_DOMAIN_PATHS
+ << REG_INMAIL_CMD_CMD_SHIFT) &
+ REG_INMAIL_CMD_CMD_MASK) |
+ REG_INMAIL_CMD_REQUEST,
+ 0, true);
+
+ usleep_range(1 * USEC_PER_MSEC, 5 * USEC_PER_MSEC);
+ iowrite32(1, nhi_ctxt->iobase + REG_HOST_INTERFACE_RST);
+
+ mutex_destroy(&nhi_ctxt->d0_exit_send_mutex);
+ mutex_destroy(&nhi_ctxt->d0_exit_mailbox_mutex);
+ mutex_destroy(&nhi_ctxt->mailbox_mutex);
+ for (i = 0; i < nhi_ctxt->num_ports; i++)
+ mutex_destroy(&(nhi_ctxt->net_devices[i].state_mutex));
+}
+
+static int icm_nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ void __iomem *iobase;
+ int i, res;
+ bool enable_msi = false;
+
+ res = pcim_enable_device(pdev);
+ if (res) {
+ dev_err(&pdev->dev, "cannot enable PCI device, aborting\n");
+ return res;
+ }
+
+ res = pcim_iomap_regions(pdev, 1 << NHI_MMIO_BAR, pci_name(pdev));
+ if (res) {
+ dev_err(&pdev->dev, "cannot obtain PCI resources, aborting\n");
+ return res;
+ }
+
+ /* cannot fail - table is allocated in pcim_iomap_regions */
+ iobase = pcim_iomap_table(pdev)[NHI_MMIO_BAR];
+
+ /* check if ICM is running */
+ if (!(ioread32(iobase + REG_FW_STS) & REG_FW_STS_ICM_EN)) {
+ dev_err(&pdev->dev, "ICM isn't present, aborting\n");
+ return -ENODEV;
+ }
+
+ nhi_ctxt = devm_kzalloc(&pdev->dev, sizeof(*nhi_ctxt), GFP_KERNEL);
+ if (!nhi_ctxt)
+ return -ENOMEM;
+
+ nhi_ctxt->pdev = pdev;
+ nhi_ctxt->iobase = iobase;
+ nhi_ctxt->id = (PCI_DEVID(pdev->bus->number, pdev->devfn) << 16) |
+ id->device;
+ /*
+ * Number of paths represents the number of rings available for
+ * the controller.
+ */
+ nhi_ctxt->num_paths = ioread32(iobase + REG_HOP_COUNT) &
+ REG_HOP_COUNT_TOTAL_PATHS_MASK;
+
+ nhi_ctxt->nvm_auth_on_boot = DEVICE_DATA_NVM_AUTH_ON_BOOT(
+ id->driver_data);
+ nhi_ctxt->support_full_e2e = DEVICE_DATA_SUPPORT_FULL_E2E(
+ id->driver_data);
+
+ nhi_ctxt->dma_port = DEVICE_DATA_DMA_PORT(id->driver_data);
+ /*
+ * Number of ports in the controller
+ */
+ nhi_ctxt->num_ports = DEVICE_DATA_NUM_PORTS(id->driver_data);
+ nhi_ctxt->nvm_ver_offset = DEVICE_DATA_NVM_VER_OFFSET(id->driver_data);
+
+ mutex_init(&nhi_ctxt->d0_exit_send_mutex);
+ mutex_init(&nhi_ctxt->d0_exit_mailbox_mutex);
+ mutex_init(&nhi_ctxt->mailbox_mutex);
+
+ sema_init(&nhi_ctxt->send_sem, 1);
+
+ INIT_WORK(&nhi_ctxt->icm_msgs_work, nhi_msgs_from_icm);
+
+ spin_lock_init(&nhi_ctxt->lock);
+
+ nhi_ctxt->net_devices = devm_kcalloc(&pdev->dev,
+ nhi_ctxt->num_ports,
+ sizeof(struct port_net_dev),
+ GFP_KERNEL);
+ if (!nhi_ctxt->net_devices)
+ return -ENOMEM;
+
+ for (i = 0; i < nhi_ctxt->num_ports; i++)
+ mutex_init(&(nhi_ctxt->net_devices[i].state_mutex));
+
+ /*
+ * allocating RX and TX vectors for ICM and per port
+ * for thunderbolt networking.
+ * The mapping of the vector is carried out by
+ * nhi_set_int_vec and looks like:
+ * 0=tx icm, 1=rx icm, 2=tx data port 0,
+ * 3=rx data port 0...
+ */
+ nhi_ctxt->num_vectors = (1 + nhi_ctxt->num_ports) * 2;
+ nhi_ctxt->msix_entries = devm_kcalloc(&pdev->dev,
+ nhi_ctxt->num_vectors,
+ sizeof(struct msix_entry),
+ GFP_KERNEL);
+ if (likely(nhi_ctxt->msix_entries)) {
+ for (i = 0; i < nhi_ctxt->num_vectors; i++)
+ nhi_ctxt->msix_entries[i].entry = i;
+ res = pci_enable_msix_exact(pdev,
+ nhi_ctxt->msix_entries,
+ nhi_ctxt->num_vectors);
+
+ if (res ||
+ /*
+ * Allocating ICM RX only.
+ * vector #0, which is TX complete to ICM,
+ * isn't been used currently
+ */
+ devm_request_irq(&pdev->dev,
+ nhi_ctxt->msix_entries[1].vector,
+ nhi_icm_ring_rx_msix, 0, pci_name(pdev),
+ nhi_ctxt)) {
+ devm_kfree(&pdev->dev, nhi_ctxt->msix_entries);
+ nhi_ctxt->msix_entries = NULL;
+ enable_msi = true;
+ }
+ } else {
+ enable_msi = true;
+ }
+ /*
+ * In case allocation didn't succeed, use msi instead of msix
+ */
+ if (enable_msi) {
+ res = pci_enable_msi(pdev);
+ if (res) {
+ dev_err(&pdev->dev, "cannot enable MSI, aborting\n");
+ return res;
+ }
+ res = devm_request_irq(&pdev->dev, pdev->irq, nhi_msi, 0,
+ pci_name(pdev), nhi_ctxt);
+ if (res) {
+ dev_err(&pdev->dev,
+ "request_irq failed %d, aborting\n", res);
+ return res;
+ }
+ }
+ /*
+ * try to work with address space of 64 bits.
+ * In case this doesn't work, work with 32 bits.
+ */
+ if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
+ nhi_ctxt->pci_using_dac = true;
+ } else {
+ res = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (res) {
+ dev_err(&pdev->dev,
+ "No suitable DMA available, aborting\n");
+ return res;
+ }
+ }
+
+ BUILD_BUG_ON(sizeof(struct tbt_buf_desc) != 16);
+ BUILD_BUG_ON(sizeof(struct tbt_icm_ring_shared_memory) > PAGE_SIZE);
+ nhi_ctxt->icm_ring_shared_mem = dmam_alloc_coherent(
+ &pdev->dev, sizeof(*nhi_ctxt->icm_ring_shared_mem),
+ &nhi_ctxt->icm_ring_shared_mem_dma_addr,
+ GFP_KERNEL | __GFP_ZERO);
+ if (nhi_ctxt->icm_ring_shared_mem == NULL) {
+ dev_err(&pdev->dev, "dmam_alloc_coherent failed, aborting\n");
+ return -ENOMEM;
+ }
+
+ nhi_ctxt->net_workqueue = create_singlethread_workqueue("thunderbolt");
+ if (!nhi_ctxt->net_workqueue) {
+ dev_err(&pdev->dev, "create_singlethread_workqueue failed, aborting\n");
+ return -ENOMEM;
+ }
+
+ pci_set_master(pdev);
+ pci_set_drvdata(pdev, nhi_ctxt);
+
+ nhi_resume(&pdev->dev);
+ /*
+ * Add the new controller at the end of the list
+ */
+ mutex_lock(&controllers_list_mutex);
+ list_add_tail(&nhi_ctxt->node, &controllers_list);
+ mutex_unlock(&controllers_list_mutex);
+
+ return res;
+}
+
+/*
+ * The tunneled pci bridges are siblings of us. Use resume_noirq to reenable
+ * the tunnels asap. A corresponding pci quirk blocks the downstream bridges
+ * resume_noirq until we are done.
+ */
+static const struct dev_pm_ops icm_nhi_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(nhi_suspend, nhi_resume)
+};
+
+static const struct pci_device_id nhi_pci_device_ids[] = {
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_NHI),
+ DEVICE_DATA(1, 5, 0xa, false, false) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_NHI),
+ DEVICE_DATA(2, 5, 0xa, false, false) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI),
+ DEVICE_DATA(1, 5, 0xa, false, false) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI),
+ DEVICE_DATA(2, 5, 0xa, false, false) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI),
+ DEVICE_DATA(1, 3, 0xa, false, false) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI),
+ DEVICE_DATA(1, 5, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI),
+ DEVICE_DATA(2, 5, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI),
+ DEVICE_DATA(1, 5, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI),
+ DEVICE_DATA(1, 3, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI),
+ DEVICE_DATA(1, 3, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI),
+ DEVICE_DATA(1, 5, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI),
+ DEVICE_DATA(2, 5, 0xa, true, true) },
+ { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI),
+ DEVICE_DATA(1, 5, 0xa, true, true) },
+ { 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, nhi_pci_device_ids);
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+static struct pci_driver icm_nhi_driver = {
+ .name = "thunderbolt",
+ .id_table = nhi_pci_device_ids,
+ .probe = icm_nhi_probe,
+ .remove = icm_nhi_remove,
+ .shutdown = icm_nhi_shutdown,
+ .driver.pm = &icm_nhi_pm_ops,
+};
+
+static int __init icm_nhi_init(void)
+{
+ int rc;
+
+ if (dmi_match(DMI_BOARD_VENDOR, "Apple Inc."))
+ return -ENODEV;
+
+ rc = genl_register_family_with_ops(&nhi_genl_family, nhi_ops);
+ if (rc)
+ goto failure;
+
+ rc = pci_register_driver(&icm_nhi_driver);
+ if (rc)
+ goto failure_genl;
+
+ return 0;
+
+failure_genl:
+ genl_unregister_family(&nhi_genl_family);
+
+failure:
+ pr_debug("nhi: error %d occurred in %s\n", rc, __func__);
+ return rc;
+}
+
+static void __exit icm_nhi_unload(void)
+{
+ genl_unregister_family(&nhi_genl_family);
+ pci_unregister_driver(&icm_nhi_driver);
+}
+
+module_init(icm_nhi_init);
+module_exit(icm_nhi_unload);
diff --git a/drivers/thunderbolt/icm/icm_nhi.h b/drivers/thunderbolt/icm/icm_nhi.h
new file mode 100644
index 0000000..1db37e5
--- /dev/null
+++ b/drivers/thunderbolt/icm/icm_nhi.h
@@ -0,0 +1,85 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ ******************************************************************************/
+
+#ifndef ICM_NHI_H_
+#define ICM_NHI_H_
+
+#include <linux/pci.h>
+#include "../nhi_regs.h"
+
+#define DRV_VERSION "16.1.55.1"
+
+#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_NHI 0x157d /*Tbt 2 Low Pwr*/
+#define PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE 0x157e
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI 0x15bf /*Tbt 3 Low Pwr*/
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE 0x15c0
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI 0x15d2 /*Thunderbolt 3*/
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE 0x15d3
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI 0x15d9
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE 0x15da
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_USBONLY_NHI 0x15dc
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_USBONLY_NHI 0x15dd
+#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_USBONLY_NHI 0x15de
+
+#define TBT_ICM_RING_MAX_FRAME_SIZE 256
+#define TBT_ICM_RING_NUM 0
+#define TBT_RING_MAX_FRM_DATA_SZ (TBT_RING_MAX_FRAME_SIZE - \
+ sizeof(struct tbt_frame_header))
+
+enum icm_operation_mode {
+ SAFE_MODE,
+ AUTHENTICATION_MODE_FUNCTIONALITY,
+ ENDPOINT_OPERATION_MODE,
+ FULL_FUNCTIONALITY,
+};
+
+#define TBT_ICM_RING_NUM_TX_BUFS TBT_RING_MIN_NUM_BUFFERS
+#define TBT_ICM_RING_NUM_RX_BUFS ((PAGE_SIZE - (TBT_ICM_RING_NUM_TX_BUFS * \
+ (sizeof(struct tbt_buf_desc) + TBT_ICM_RING_MAX_FRAME_SIZE))) / \
+ (sizeof(struct tbt_buf_desc) + TBT_ICM_RING_MAX_FRAME_SIZE))
+
+/* struct tbt_icm_ring_shared_memory - memory area for DMA */
+struct tbt_icm_ring_shared_memory {
+ u8 tx_buf[TBT_ICM_RING_NUM_TX_BUFS][TBT_ICM_RING_MAX_FRAME_SIZE];
+ u8 rx_buf[TBT_ICM_RING_NUM_RX_BUFS][TBT_ICM_RING_MAX_FRAME_SIZE];
+ struct tbt_buf_desc tx_buf_desc[TBT_ICM_RING_NUM_TX_BUFS];
+ struct tbt_buf_desc rx_buf_desc[TBT_ICM_RING_NUM_RX_BUFS];
+} __aligned(TBT_ICM_RING_MAX_FRAME_SIZE);
+
+/* mailbox data from SW */
+#define REG_INMAIL_DATA 0x39900
+
+/* mailbox command from SW */
+#define REG_INMAIL_CMD 0x39904
+#define REG_INMAIL_CMD_CMD_SHIFT 0
+#define REG_INMAIL_CMD_CMD_MASK GENMASK(7, REG_INMAIL_CMD_CMD_SHIFT)
+#define REG_INMAIL_CMD_ERROR BIT(30)
+#define REG_INMAIL_CMD_REQUEST BIT(31)
+
+/* mailbox command from FW */
+#define REG_OUTMAIL_CMD 0x3990C
+#define REG_OUTMAIL_CMD_STS_SHIFT 0
+#define REG_OUTMAIL_CMD_STS_MASK GENMASK(7, REG_OUTMAIL_CMD_STS_SHIFT)
+#define REG_OUTMAIL_CMD_OP_MODE_SHIFT 8
+#define REG_OUTMAIL_CMD_OP_MODE_MASK \
+ GENMASK(11, REG_OUTMAIL_CMD_OP_MODE_SHIFT)
+#define REG_OUTMAIL_CMD_REQUEST BIT(31)
+
+#define REG_FW_STS 0x39944
+#define REG_FW_STS_ICM_EN GENMASK(1, 0)
+#define REG_FW_STS_NVM_AUTH_DONE BIT(31)
+
+#endif
diff --git a/drivers/thunderbolt/icm/net.h b/drivers/thunderbolt/icm/net.h
new file mode 100644
index 0000000..0281201
--- /dev/null
+++ b/drivers/thunderbolt/icm/net.h
@@ -0,0 +1,217 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ ******************************************************************************/
+
+#ifndef NET_H_
+#define NET_H_
+
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/mutex.h>
+#include <linux/semaphore.h>
+#include <net/genetlink.h>
+
+/*
+ * Each physical port contains 2 channels.
+ * Devices are exposed to user based on physical ports.
+ */
+#define CHANNELS_PER_PORT_NUM 2
+/*
+ * Calculate host physical port number (Zero-based numbering) from
+ * host channel/link which starts from 1.
+ */
+#define PORT_NUM_FROM_LINK(link) (((link) - 1) / CHANNELS_PER_PORT_NUM)
+
+#define TBT_TX_RING_FULL(prod, cons, size) ((((prod) + 1) % (size)) == (cons))
+#define TBT_TX_RING_EMPTY(prod, cons) ((prod) == (cons))
+#define TBT_RX_RING_FULL(prod, cons) ((prod) == (cons))
+#define TBT_RX_RING_EMPTY(prod, cons, size) ((((cons) + 1) % (size)) == (prod))
+
+#define PATH_FROM_PORT(num_paths, port_num) (((num_paths) - 1) - (port_num))
+
+/* Protocol Defined Field values for SW<->FW communication in raw mode */
+enum pdf_value {
+ PDF_READ_CONFIGURATION_REGISTERS = 1,
+ PDF_WRITE_CONFIGURATION_REGISTERS,
+ PDF_ERROR_NOTIFICATION,
+ PDF_ERROR_ACKNOWLEDGMENT,
+ PDF_PLUG_EVENT_NOTIFICATION,
+ PDF_INTER_DOMAIN_REQUEST,
+ PDF_INTER_DOMAIN_RESPONSE,
+ PDF_CM_OVERRIDE,
+ PDF_RESET_CIO_SWITCH,
+ PDF_FW_TO_SW_NOTIFICATION,
+ PDF_SW_TO_FW_COMMAND,
+ PDF_FW_TO_SW_RESPONSE
+};
+
+/*
+ * SW->FW commands
+ * CC = Command Code
+ */
+enum {
+ CC_GET_THUNDERBOLT_TOPOLOGY = 1,
+ CC_GET_VIDEO_RESOURCES_DATA,
+ CC_DRV_READY,
+ CC_APPROVE_PCI_CONNECTION,
+ CC_CHALLENGE_PCI_CONNECTION,
+ CC_ADD_DEVICE_AND_KEY,
+ CC_APPROVE_INTER_DOMAIN_CONNECTION = 0x10
+};
+
+/*
+ * FW->SW responses
+ * RC = response code
+ */
+enum {
+ RC_GET_TBT_TOPOLOGY = 1,
+ RC_GET_VIDEO_RESOURCES_DATA,
+ RC_DRV_READY,
+ RC_APPROVE_PCI_CONNECTION,
+ RC_CHALLENGE_PCI_CONNECTION,
+ RC_ADD_DEVICE_AND_KEY,
+ RC_INTER_DOMAIN_PKT_SENT = 8,
+ RC_APPROVE_INTER_DOMAIN_CONNECTION = 0x10
+};
+
+/*
+ * FW->SW notifications
+ * NC = notification code
+ */
+enum {
+ NC_DEVICE_CONNECTED = 3,
+ NC_DEVICE_DISCONNECTED,
+ NC_DP_DEVICE_CONNECTED_NOT_TUNNELED,
+ NC_INTER_DOMAIN_CONNECTED,
+ NC_INTER_DOMAIN_DISCONNECTED
+};
+
+/*
+ * SW -> FW mailbox commands
+ * CC = Command Code
+ */
+enum {
+ CC_STOP_CM_ACTIVITY,
+ CC_ENTER_PASS_THROUGH_MODE,
+ CC_ENTER_CM_OWNERSHIP_MODE,
+ CC_DRV_LOADED,
+ CC_DRV_UNLOADED,
+ CC_SAVE_CURRENT_CONNECTED_DEVICES,
+ CC_DISCONNECT_PCIE_PATHS,
+ CC_DRV_UNLOADS_AND_DISCONNECT_INTER_DOMAIN_PATHS,
+ DISCONNECT_PORT_A_INTER_DOMAIN_PATH = 0x10,
+ DISCONNECT_PORT_B_INTER_DOMAIN_PATH,
+ DP_TUNNEL_MODE_IN_ORDER_PER_CAPABILITIES = 0x1E,
+ DP_TUNNEL_MODE_MAXIMIZE_SNK_SRC_TUNNELS,
+ CC_SET_FW_MODE_FD1_D1_CERT = 0x20,
+ CC_SET_FW_MODE_FD1_D1_ALL,
+ CC_SET_FW_MODE_FD1_DA_CERT,
+ CC_SET_FW_MODE_FD1_DA_ALL,
+ CC_SET_FW_MODE_FDA_D1_CERT,
+ CC_SET_FW_MODE_FDA_D1_ALL,
+ CC_SET_FW_MODE_FDA_DA_CERT,
+ CC_SET_FW_MODE_FDA_DA_ALL
+};
+
+
+/* NHI genetlink attributes */
+enum {
+ NHI_ATTR_UNSPEC,
+ NHI_ATTR_DRV_VERSION,
+ NHI_ATTR_NVM_VER_OFFSET,
+ NHI_ATTR_NUM_PORTS,
+ NHI_ATTR_DMA_PORT,
+ NHI_ATTR_SUPPORT_FULL_E2E,
+ NHI_ATTR_MAILBOX_CMD,
+ NHI_ATTR_PDF,
+ NHI_ATTR_MSG_TO_ICM,
+ NHI_ATTR_MSG_FROM_ICM,
+ __NHI_ATTR_MAX,
+};
+#define NHI_ATTR_MAX (__NHI_ATTR_MAX - 1)
+
+struct port_net_dev {
+ struct net_device *net_dev;
+ struct mutex state_mutex;
+};
+
+/**
+ * struct tbt_nhi_ctxt - thunderbolt native host interface context
+ * @node: node in the controllers list.
+ * @pdev: pci device information.
+ * @iobase: address of I/O.
+ * @msix_entries: MSI-X vectors.
+ * @icm_ring_shared_mem: virtual address of iCM ring.
+ * @icm_ring_shared_mem_dma_addr: DMA addr of iCM ring.
+ * @send_sem: semaphore for sending messages to iCM
+ * one at a time.
+ * @mailbox_mutex: mutex for sending mailbox commands to
+ * iCM one at a time.
+ * @d0_exit_send_mutex: synchronizing the d0 exit with messages.
+ * @d0_exit_mailbox_mutex: synchronizing the d0 exit with mailbox.
+ * @lock: synchronizing the interrupt registers
+ * access.
+ * @icm_msgs_work: work queue for handling messages
+ * from iCM.
+ * @net_devices: net devices per port.
+ * @net_workqueue: work queue to send net messages.
+ * @id: id of the controller.
+ * @num_paths: number of paths supported by controller.
+ * @nvm_ver_offset: offset of NVM version in NVM.
+ * @num_vectors: number of MSI-X vectors.
+ * @num_ports: number of ports in the controller.
+ * @dma_port: DMA port.
+ * @d0_exit: whether controller exit D0 state.
+ * @nvm_auth_on_boot: whether iCM authenticates the NVM
+ * during boot.
+ * @wait_for_icm_resp: whether to wait for iCM response.
+ * @ignore_icm_resp: whether to ignore iCM response.
+ * @pci_using_dac: whether using DAC.
+ * @support_full_e2e: whether controller support full E2E.
+ */
+struct tbt_nhi_ctxt {
+ struct list_head node;
+ struct pci_dev *pdev;
+ void __iomem *iobase;
+ struct msix_entry *msix_entries;
+ struct tbt_icm_ring_shared_memory *icm_ring_shared_mem;
+ dma_addr_t icm_ring_shared_mem_dma_addr;
+ struct semaphore send_sem;
+ struct mutex mailbox_mutex;
+ struct mutex d0_exit_send_mutex;
+ struct mutex d0_exit_mailbox_mutex;
+ spinlock_t lock;
+ struct work_struct icm_msgs_work;
+ struct port_net_dev *net_devices;
+ struct workqueue_struct *net_workqueue;
+ u32 id;
+ u32 num_paths;
+ u16 nvm_ver_offset;
+ u8 num_vectors;
+ u8 num_ports;
+ u8 dma_port;
+ bool d0_exit;
+ bool nvm_auth_on_boot : 1;
+ bool wait_for_icm_resp : 1;
+ bool ignore_icm_resp : 1;
+ bool pci_using_dac : 1;
+ bool support_full_e2e : 1;
+};
+
+int nhi_send_message(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
+ u32 msg_len, const void *msg, bool ignore_icm_resp);
+int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit);
+
+#endif
--
2.7.4

2016-11-09 12:21:16

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 6/8] thunderbolt: Kconfig for Thunderbolt Networking

Update to the Kconfig Thunderbolt description to add
Thunderbolt networking as an option.
The menu item "Thunderbolt support" now offers:
"Apple Hardware Support" (existing)
and/or
"Thunderbolt Networking" (new)

You can choose the driver for your platform or build both drivers -
each driver will detect if it can run on the specific platform.
If the Thunderbolt Networking option is chosen, Thunderbolt Networking
will be enabled between Linux non-Apple systems, macOS and
Windows based systems.
Thunderbolt Networking will not affect any other Thunderbolt feature that
was previous available to Linux users on either Apple or
non-Apple platforms.

Signed-off-by: Amir Levy <[email protected]>
---
drivers/thunderbolt/Kconfig | 27 +++++++++++++++++++++++----
drivers/thunderbolt/Makefile | 3 ++-
2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/thunderbolt/Kconfig b/drivers/thunderbolt/Kconfig
index c121acc..376e5bb 100644
--- a/drivers/thunderbolt/Kconfig
+++ b/drivers/thunderbolt/Kconfig
@@ -1,13 +1,32 @@
-menuconfig THUNDERBOLT
- tristate "Thunderbolt support for Apple devices"
+config THUNDERBOLT
+ tristate "Thunderbolt support"
depends on PCI
select CRC32
help
- Cactus Ridge Thunderbolt Controller driver
+ Thunderbolt Controller driver
+
+if THUNDERBOLT
+
+config THUNDERBOLT_APPLE
+ tristate "Apple hardware support"
+ help
This driver is required if you want to hotplug Thunderbolt devices on
Apple hardware.

Device chaining is currently not supported.

- To compile this driver a module, choose M here. The module will be
+ To compile this driver as a module, choose M here. The module will be
called thunderbolt.
+
+config THUNDERBOLT_ICM
+ tristate "Thunderbolt Networking"
+ help
+ This driver is required if you want Thunderbolt Networking on
+ non-Apple hardware.
+ It creates a virtual Ethernet device that enables computer to
+ computer communication over a Thunderbolt cable.
+
+ To compile this driver as a module, choose M here. The module will be
+ called thunderbolt_icm.
+
+endif
diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
index 5d1053c..b6aa6a3 100644
--- a/drivers/thunderbolt/Makefile
+++ b/drivers/thunderbolt/Makefile
@@ -1,3 +1,4 @@
-obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
+obj-${CONFIG_THUNDERBOLT_APPLE} := thunderbolt.o
thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o path.o tunnel_pci.o eeprom.o

+obj-${CONFIG_THUNDERBOLT_ICM} += icm/
--
2.7.4

2016-11-09 12:21:41

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 8/8] thunderbolt: Adding maintainer entry

Add Amir Levy as maintainer for Thunderbolt(TM) ICM driver

Signed-off-by: Amir Levy <[email protected]>
---
MAINTAINERS | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index 411e3b8..87763c44 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10652,7 +10652,13 @@ F: include/uapi/linux/stm.h
THUNDERBOLT DRIVER
M: Andreas Noever <[email protected]>
S: Maintained
-F: drivers/thunderbolt/
+F: drivers/thunderbolt/*
+
+THUNDERBOLT ICM DRIVER
+M: Amir Levy <[email protected]>
+S: Maintained
+F: drivers/thunderbolt/icm/
+F: Documentation/thunderbolt/networking.txt

TI BQ27XXX POWER SUPPLY DRIVER
R: Andrew F. Davis <[email protected]>
--
2.7.4

2016-11-09 12:22:05

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 7/8] thunderbolt: Networking doc

Adding Thunderbolt(TM) networking documentation.

Signed-off-by: Amir Levy <[email protected]>
---
Documentation/00-INDEX | 2 +
Documentation/thunderbolt/networking.txt | 132 +++++++++++++++++++++++++++++++
2 files changed, 134 insertions(+)
create mode 100644 Documentation/thunderbolt/networking.txt

diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index 3acc4f1..0239e68 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -440,6 +440,8 @@ this_cpu_ops.txt
- List rationale behind and the way to use this_cpu operations.
thermal/
- directory with information on managing thermal issues (CPU/temp)
+thunderbolt/
+ - directory with info regarding Thunderbolt.
trace/
- directory with info on tracing technologies within linux
unaligned-memory-access.txt
diff --git a/Documentation/thunderbolt/networking.txt b/Documentation/thunderbolt/networking.txt
new file mode 100644
index 0000000..88d1c12
--- /dev/null
+++ b/Documentation/thunderbolt/networking.txt
@@ -0,0 +1,132 @@
+Intel Thunderbolt(TM) Networking driver
+=======================================
+
+Copyright(c) 2013 - 2016 Intel Corporation.
+
+Contact Information:
+Intel Thunderbolt mailing list <[email protected]>
+Edited by Amir Levy <[email protected]>
+
+Overview
+========
+
+* The Thunderbolt Networking driver enables peer to peer networking on non-Apple
+ platforms running Linux.
+
+* The driver creates a virtual Ethernet device that enables computer to computer
+ communication over the Thunderbolt cable.
+
+* Using Thunderbolt Networking you can perform high speed file transfers between
+ computers, perform PC migrations and/or set up small workgroups with shared
+ storage without compromising any other Thunderbolt functionality.
+
+* The driver is located in drivers/thunderbolt/icm.
+
+* This driver will function only on non-Apple platforms with firmware based
+ Thunderbolt controllers that support Thunderbolt Networking.
+
+ +----------------+ +----------------+
+ |Host 1 | |Host 2 |
+ | | | |
+ | +-------+ | | +-------+ |
+ | |Network| | | |Network| |
+ | |Stack | | | |Stack | |
+ | +-------+ | | +-------+ |
+ | ^ | | ^ |
+ | | | | | |
+ | v | | v |
+ | +-----------+ | | +-----------+ |
+ | |Thunderbolt| | | |Thunderbolt| |
+ | |Networking | | | |Networking | |
+ | |Driver | | | |Driver | |
+ | +-----------+ | | +-----------+ |
+ | ^ | | ^ |
+ | | | | | |
+ | v | | v |
+ | +-----------+ | | +-----------+ |
+ | |Thunderbolt| | | |Thunderbolt| |
+ | |Controller |<-+------------+->|Controller | |
+ | |with ICM | | | |with ICM | |
+ | |enabled | | | |enabled | |
+ | +-----------+ | | +-----------+ |
+ +----------------+ +----------------+
+
+Files
+=====
+
+The following files are located in the drivers/thunderbolt/icm directory:
+
+- icm_nhi.c/h: These files allow communication with the firmware (Intel
+ Connection Manager) based controller. They also create an interface for
+ netlink communication with a user space daemon.
+
+- net.c/net.h: These files implement the 'eth' interface for the
+ Thunderbolt(TM) Networking.
+
+Interface to User Space
+=======================
+
+The interface to the user space module is implemented through a Generic Netlink.
+This is the communications protocol between the Thunderbolt driver and the user
+space application.
+
+Note that this interface mediates user space communication with ICM.
+(Existing Linux tools can be used to configure the network interface.)
+
+The Thunderbolt Daemon utilizes this interface to communicate with the driver.
+To be accessed by the user space module, both kernel and user space modules
+have to register with the same GENL_NAME.
+For the purpose of the Thunderbolt Network driver, "thunderbolt" is used.
+The registration is done at driver initialization time for all instances
+of the Thunderbolt controllers. The communication is carried through pre-defined
+Thunderbolt messages. Each specific message has a callback function that is
+called when the related message is received.
+
+Message Definitions:
+* NHI_CMD_UNSPEC: Not used.
+* NHI_CMD_SUBSCRIBE: Subscription request from daemon to driver to open the
+ communication channel.
+* NHI_CMD_UNSUBSCRIBE: Request from daemon to driver to unsubscribe and
+ to close communication channel.
+* NHI_CMD_QUERY_INFORMATION: Request information from the driver such as
+ driver version, FW version offset, number of ports in the controller
+ and DMA port.
+* NHI_CMD_MSG_TO_ICM: Message from user space module to FW.
+* NHI_CMD_MSG_FROM_ICM: Response from FW to user space module.
+* NHI_CMD_MAILBOX: Message that uses mailbox mechanism such as FW policy
+ changes or disconnect path.
+* NHI_CMD_APPROVE_TBT_NETWORKING: Request from user space module to FW to
+ establish path.
+* NHI_CMD_ICM_IN_SAFE_MODE: Indication that the FW has entered safe mode.
+
+Communication with Intel Connection Manager(ICM) Firmware
+=========================================================
+
+There are several circular buffers in Thunderbolt each using Direct Memory
+Access (DMA).
+
+Communication with ICM utilizes circular buffer ring #0. (The other rings are
+used for peer to peer communication, packet transmission and receiving).
+
+The driver allocates a shared memory that is physically mapped onto the DMA
+physical space at ring #0.
+For the software to communicate with the firmware, the driver sends a command
+in ring #0. The command contains a pre-defined field (PDF) value notifying the
+firmware that the driver is ready. To proceed, the driver must receive the
+appropriate PDF value in response from the firmware.
+
+Once the exchange is completed, messages can be sent to the firmware through
+the driver. Similarly, the firmware can now send notifications about hardware
+and firmware events.
+
+Information
+===========
+
+Mailing list:
+ [email protected]
+ Register at: https://lists.01.org/mailman/listinfo/thunderbolt-software
+ Archives at: https://lists.01.org/pipermail/thunderbolt-software/
+
+For additional information about Thunderbolt technology visit:
+ https://01.org/thunderbolt-sw
+ https://thunderbolttechnology.net/
--
2.7.4

2016-11-09 12:21:11

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 5/8] thunderbolt: Networking transmit and receive

This patch provides the handling interface for sending and receiving
network packets between the hosts over the full communication route
(using the communication path established in the previous patch).

The Thunderbolt Network driver interfaces the Linux network stack
and the hardware controller configuration to handle packet transmissions:
+----------------+ +----------------+
|Host 1 | |Host 2 |
| | | |
| +-------+ | | +-------+ |
| |Network| | | |Network| |
| |Stack | | | |Stack | |
| +-------+ | | +-------+ |
| ^ | | ^ |
| | | | | |
| v | | v |
| +-----------+ | | +-----------+ |
| |Thunderbolt| | | |Thunderbolt| |
| |Networking | | | |Networking | |
| |Driver | | | |Driver | |
| +-----------+ | | +-----------+ |
| ^ | | ^ |
| | | | | |
| v | | v |
| +-----------+ | | +-----------+ |
| |Thunderbolt| | | |Thunderbolt| |
| |Controller |<-+------------+->|Controller | |
| +-----------+ | | +-----------+ |
+----------------+ +----------------+

Signed-off-by: Amir Levy <[email protected]>
---
drivers/thunderbolt/icm/icm_nhi.c | 15 +
drivers/thunderbolt/icm/net.c | 1471 +++++++++++++++++++++++++++++++++++++
2 files changed, 1486 insertions(+)

diff --git a/drivers/thunderbolt/icm/icm_nhi.c b/drivers/thunderbolt/icm/icm_nhi.c
index edc910b..b1cc347 100644
--- a/drivers/thunderbolt/icm/icm_nhi.c
+++ b/drivers/thunderbolt/icm/icm_nhi.c
@@ -928,6 +928,7 @@ static irqreturn_t nhi_msi(int __always_unused irq, void *data)
{
struct tbt_nhi_ctxt *nhi_ctxt = data;
u32 isr0, isr1, imr0, imr1;
+ int i;

/* clear on read */
isr0 = ioread32(nhi_ctxt->iobase + REG_RING_NOTIFY_BASE);
@@ -950,6 +951,20 @@ static irqreturn_t nhi_msi(int __always_unused irq, void *data)

spin_unlock(&nhi_ctxt->lock);

+ for (i = 0; i < nhi_ctxt->num_ports; ++i) {
+ struct net_device *net_dev =
+ nhi_ctxt->net_devices[i].net_dev;
+ if (net_dev) {
+ u8 path = PATH_FROM_PORT(nhi_ctxt->num_paths, i);
+
+ if (isr0 & REG_RING_INT_RX_PROCESSED(
+ path, nhi_ctxt->num_paths))
+ tbt_net_rx_msi(net_dev);
+ if (isr0 & REG_RING_INT_TX_PROCESSED(path))
+ tbt_net_tx_msi(net_dev);
+ }
+ }
+
if (isr0 & REG_RING_INT_RX_PROCESSED(TBT_ICM_RING_NUM,
nhi_ctxt->num_paths))
schedule_work(&nhi_ctxt->icm_msgs_work);
diff --git a/drivers/thunderbolt/icm/net.c b/drivers/thunderbolt/icm/net.c
index beeafb3..cf985dd 100644
--- a/drivers/thunderbolt/icm/net.c
+++ b/drivers/thunderbolt/icm/net.c
@@ -124,6 +124,17 @@ struct approve_inter_domain_connection_cmd {

};

+struct tbt_frame_header {
+ /* size of the data with the frame */
+ __le32 frame_size;
+ /* running index on the frames */
+ __le16 frame_index;
+ /* ID of the frame to match frames to specific packet */
+ __le16 frame_id;
+ /* how many frames assembles a full packet */
+ __le32 frame_count;
+};
+
enum neg_event {
RECEIVE_LOGOUT = NUM_MEDIUM_STATUSES,
RECEIVE_LOGIN_RESPONSE,
@@ -131,15 +142,81 @@ enum neg_event {
NUM_NEG_EVENTS
};

+enum frame_status {
+ GOOD_FRAME,
+ GOOD_AS_FIRST_FRAME,
+ GOOD_AS_FIRST_MULTICAST_FRAME,
+ FRAME_NOT_READY,
+ FRAME_ERROR,
+};
+
+enum packet_filter {
+ /* all multicast MAC addresses */
+ PACKET_TYPE_ALL_MULTICAST,
+ /* all types of MAC addresses: multicast, unicast and broadcast */
+ PACKET_TYPE_PROMISCUOUS,
+ /* all unicast MAC addresses */
+ PACKET_TYPE_UNICAST_PROMISCUOUS,
+};
+
enum disconnect_path_stage {
STAGE_1 = BIT(0),
STAGE_2 = BIT(1)
};

+struct tbt_net_stats {
+ u64 tx_packets;
+ u64 tx_bytes;
+ u64 tx_errors;
+ u64 rx_packets;
+ u64 rx_bytes;
+ u64 rx_length_errors;
+ u64 rx_over_errors;
+ u64 rx_crc_errors;
+ u64 rx_missed_errors;
+ u64 multicast;
+};
+
+static const char tbt_net_gstrings_stats[][ETH_GSTRING_LEN] = {
+ "tx_packets",
+ "tx_bytes",
+ "tx_errors",
+ "rx_packets",
+ "rx_bytes",
+ "rx_length_errors",
+ "rx_over_errors",
+ "rx_crc_errors",
+ "rx_missed_errors",
+ "multicast",
+};
+
+struct tbt_buffer {
+ dma_addr_t dma;
+ union {
+ struct tbt_frame_header *hdr;
+ struct page *page;
+ };
+ u32 page_offset;
+};
+
+struct tbt_desc_ring {
+ /* pointer to the descriptor ring memory */
+ struct tbt_buf_desc *desc;
+ /* physical address of the descriptor ring */
+ dma_addr_t dma;
+ /* array of buffer structs */
+ struct tbt_buffer *buffers;
+ /* last descriptor that was associated with a buffer */
+ u16 last_allocated;
+ /* next descriptor to check for DD status bit */
+ u16 next_to_clean;
+};
+
/**
* struct tbt_port - the basic tbt_port structure
* @tbt_nhi_ctxt: context of the nhi controller.
* @net_dev: networking device object.
+ * @napi: network API
* @login_retry_work: work queue for sending login requests.
* @login_response_work: work queue for sending login responses.
* @work_struct logout_work: work queue for sending logout requests.
@@ -155,6 +232,11 @@ enum disconnect_path_stage {
* @login_retry_count: counts number of login retries sent.
* @local_depth: depth of the remote peer in the chain.
* @transmit_path: routing parameter for the icm.
+ * @tx_ring: transmit ring from where the packets are sent.
+ * @rx_ring: receive ring where the packets are received.
+ * @stats: network statistics of the rx/tx packets.
+ * @packet_filters: defines filters for the received packets.
+ * @multicast_hash_table: hash table of multicast addresses.
* @frame_id: counting ID of frames.
* @num: port number.
* @local_path: routing parameter for the icm.
@@ -164,6 +246,7 @@ enum disconnect_path_stage {
struct tbt_port {
struct tbt_nhi_ctxt *nhi_ctxt;
struct net_device *net_dev;
+ struct napi_struct napi;
struct delayed_work login_retry_work;
struct work_struct login_response_work;
struct work_struct logout_work;
@@ -179,6 +262,17 @@ struct tbt_port {
u8 login_retry_count;
u8 local_depth;
u8 transmit_path;
+ struct tbt_desc_ring tx_ring ____cacheline_aligned_in_smp;
+ struct tbt_desc_ring rx_ring;
+ struct tbt_net_stats stats;
+ u32 packet_filters;
+ /*
+ * hash table of 1024 boolean entries with hashing of
+ * the multicast address
+ */
+ u32 multicast_hash_table[DIV_ROUND_UP(
+ TBT_NET_MULTICAST_HASH_TABLE_SIZE,
+ BITS_PER_U32)];
u16 frame_id;
u8 num;
u8 local_path;
@@ -225,6 +319,8 @@ static void tbt_net_tear_down(struct net_device *net_dev, bool send_logout)
(port->local_path * REG_OPTS_STEP);
u32 rx_reg_val = ioread32(rx_reg) & ~REG_OPTS_E2E_EN;

+ napi_disable(&port->napi);
+
tx_reg = iobase + REG_TX_OPTIONS_BASE +
(port->local_path * REG_OPTS_STEP);
tx_reg_val = ioread32(tx_reg) & ~REG_OPTS_E2E_EN;
@@ -266,8 +362,1336 @@ static void tbt_net_tear_down(struct net_device *net_dev, bool send_logout)
port->nhi_ctxt->num_paths);
spin_unlock_irqrestore(&port->nhi_ctxt->lock, flags);
}
+
+ port->rx_ring.next_to_clean = 0;
+ port->rx_ring.last_allocated = TBT_NET_NUM_RX_BUFS - 1;
+
+}
+
+void tbt_net_tx_msi(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ void __iomem *iobase = port->nhi_ctxt->iobase;
+ u32 prod_cons, prod, cons;
+
+ prod_cons = ioread32(TBT_RING_CONS_PROD_REG(iobase, REG_TX_RING_BASE,
+ port->local_path));
+ prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+ cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+ if (prod >= TBT_NET_NUM_TX_BUFS || cons >= TBT_NET_NUM_TX_BUFS)
+ return;
+
+ if (TBT_NUM_BUFS_BETWEEN(prod, cons, TBT_NET_NUM_TX_BUFS) >=
+ TX_WAKE_THRESHOLD) {
+ netif_wake_queue(port->net_dev);
+ } else {
+ spin_lock(&port->nhi_ctxt->lock);
+ /* enable TX interrupt */
+ RING_INT_ENABLE_TX(iobase, port->local_path);
+ spin_unlock(&port->nhi_ctxt->lock);
+ }
+}
+
+static irqreturn_t tbt_net_tx_msix(int __always_unused irq, void *data)
+{
+ struct tbt_port *port = data;
+ void __iomem *iobase = port->nhi_ctxt->iobase;
+ u32 prod_cons, prod, cons;
+
+ prod_cons = ioread32(TBT_RING_CONS_PROD_REG(iobase,
+ REG_TX_RING_BASE,
+ port->local_path));
+ prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+ cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+ if (prod < TBT_NET_NUM_TX_BUFS && cons < TBT_NET_NUM_TX_BUFS &&
+ TBT_NUM_BUFS_BETWEEN(prod, cons, TBT_NET_NUM_TX_BUFS) >=
+ TX_WAKE_THRESHOLD) {
+ spin_lock(&port->nhi_ctxt->lock);
+ /* disable TX interrupt */
+ RING_INT_DISABLE_TX(iobase, port->local_path);
+ spin_unlock(&port->nhi_ctxt->lock);
+
+ netif_wake_queue(port->net_dev);
+ }
+
+ return IRQ_HANDLED;
+}
+
+void tbt_net_rx_msi(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ napi_schedule_irqoff(&port->napi);
+}
+
+static irqreturn_t tbt_net_rx_msix(int __always_unused irq, void *data)
+{
+ struct tbt_port *port = data;
+
+ if (likely(napi_schedule_prep(&port->napi))) {
+ struct tbt_nhi_ctxt *nhi_ctx = port->nhi_ctxt;
+
+ spin_lock(&nhi_ctx->lock);
+ /* disable RX interrupt */
+ RING_INT_DISABLE_RX(nhi_ctx->iobase, port->local_path,
+ nhi_ctx->num_paths);
+ spin_unlock(&nhi_ctx->lock);
+
+ __napi_schedule_irqoff(&port->napi);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void tbt_net_pull_tail(struct sk_buff *skb)
+{
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
+ unsigned int pull_len;
+ unsigned char *va;
+
+ /*
+ * it is valid to use page_address instead of kmap since we are
+ * working with pages allocated out of the lomem pool
+ */
+ va = skb_frag_address(frag);
+
+ pull_len = eth_get_headlen(va, TBT_NET_RX_HDR_SIZE);
+
+ /* align pull length to size of long to optimize memcpy performance */
+ skb_copy_to_linear_data(skb, va, ALIGN(pull_len, sizeof(long)));
+
+ /* update all of the pointers */
+ skb_frag_size_sub(frag, pull_len);
+ frag->page_offset += pull_len;
+ skb->data_len -= pull_len;
+ skb->tail += pull_len;
+}
+
+static inline bool tbt_net_alloc_mapped_page(struct device *dev,
+ struct tbt_buffer *buf, gfp_t gfp)
+{
+ if (!buf->page) {
+ buf->page = alloc_page(gfp | __GFP_COLD);
+ if (unlikely(!buf->page))
+ return false;
+
+ buf->dma = dma_map_page(dev, buf->page, 0, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, buf->dma)) {
+ __free_page(buf->page);
+ buf->page = NULL;
+ return false;
+ }
+ buf->page_offset = 0;
+ }
+ return true;
+}
+
+static bool tbt_net_alloc_rx_buffers(struct device *dev,
+ struct tbt_desc_ring *rx_ring,
+ u16 cleaned_count, void __iomem *reg,
+ gfp_t gfp)
+{
+ u16 i = (rx_ring->last_allocated + 1) & (TBT_NET_NUM_RX_BUFS - 1);
+ bool res = false;
+
+ while (cleaned_count--) {
+ struct tbt_buf_desc *desc = &rx_ring->desc[i];
+ struct tbt_buffer *buf = &rx_ring->buffers[i];
+
+ /* making sure next_to_clean won't get old buffer */
+ desc->attributes = cpu_to_le32(DESC_ATTR_REQ_STS |
+ DESC_ATTR_INT_EN);
+ if (tbt_net_alloc_mapped_page(dev, buf, gfp)) {
+ res = true;
+ rx_ring->last_allocated = i;
+ i = (i + 1) & (TBT_NET_NUM_RX_BUFS - 1);
+ desc->phys = cpu_to_le64(buf->dma + buf->page_offset);
+ } else {
+ break;
+ }
+ }
+
+ if (res) {
+ iowrite32((rx_ring->last_allocated << REG_RING_CONS_SHIFT) &
+ REG_RING_CONS_MASK, reg);
+ }
+
+ return res;
+}
+
+static inline bool tbt_net_multicast_mac_set(const u32 *multicast_hash_table,
+ const u8 *ether_addr)
+{
+ u16 hash_val = TBT_NET_ETHER_ADDR_HASH(ether_addr);
+
+ return !!(multicast_hash_table[hash_val / BITS_PER_U32] &
+ BIT(hash_val % BITS_PER_U32));
+}
+
+static enum frame_status tbt_net_check_frame(struct tbt_port *port,
+ u16 frame_num, u32 *count,
+ u16 index, u16 *id, u32 *size)
+{
+ struct tbt_desc_ring *rx_ring = &port->rx_ring;
+ __le32 desc_attr = rx_ring->desc[frame_num].attributes;
+ enum frame_status res = GOOD_AS_FIRST_FRAME;
+ u32 len, frame_count, frame_size;
+ struct tbt_frame_header *hdr;
+
+ if (!(desc_attr & cpu_to_le32(DESC_ATTR_DESC_DONE)))
+ return FRAME_NOT_READY;
+
+ rmb(); /* read other fields from desc after checking DD */
+
+ if (unlikely(desc_attr & cpu_to_le32(DESC_ATTR_RX_CRC_ERR))) {
+ ++port->stats.rx_crc_errors;
+ goto err;
+ } else if (unlikely(desc_attr &
+ cpu_to_le32(DESC_ATTR_RX_BUF_OVRN_ERR))) {
+ ++port->stats.rx_over_errors;
+ goto err;
+ }
+
+ len = (le32_to_cpu(desc_attr) & DESC_ATTR_LEN_MASK)
+ >> DESC_ATTR_LEN_SHIFT;
+ if (len == 0)
+ len = TBT_RING_MAX_FRAME_SIZE;
+ /* should be greater than just header i.e. contains data */
+ if (unlikely(len <= sizeof(struct tbt_frame_header))) {
+ ++port->stats.rx_length_errors;
+ goto err;
+ }
+
+ prefetchw(rx_ring->buffers[frame_num].page);
+ hdr = page_address(rx_ring->buffers[frame_num].page) +
+ rx_ring->buffers[frame_num].page_offset;
+ /* prefetch first cache line of first page */
+ prefetch(hdr);
+
+ /* we are reusing so sync this buffer for CPU use */
+ dma_sync_single_range_for_cpu(&port->nhi_ctxt->pdev->dev,
+ rx_ring->buffers[frame_num].dma,
+ rx_ring->buffers[frame_num].page_offset,
+ TBT_RING_MAX_FRAME_SIZE,
+ DMA_FROM_DEVICE);
+
+ frame_count = le32_to_cpu(hdr->frame_count);
+ frame_size = le32_to_cpu(hdr->frame_size);
+
+ if (unlikely((frame_size > len - sizeof(struct tbt_frame_header)) ||
+ (frame_size == 0))) {
+ ++port->stats.rx_length_errors;
+ goto err;
+ }
+ /*
+ * In case we're in the middle of packet, validate the frame header
+ * based on first fragment of the packet
+ */
+ if (*count) {
+ /* check the frame count fits the count field */
+ if (frame_count != *count) {
+ ++port->stats.rx_length_errors;
+ goto check_as_first;
+ }
+
+ /*
+ * check the frame identifiers are incremented correctly,
+ * and id is matching
+ */
+ if ((le16_to_cpu(hdr->frame_index) != index) ||
+ (le16_to_cpu(hdr->frame_id) != *id)) {
+ ++port->stats.rx_missed_errors;
+ goto check_as_first;
+ }
+
+ *size += frame_size;
+ if (*size > TBT_NET_MTU) {
+ ++port->stats.rx_length_errors;
+ goto err;
+ }
+ res = GOOD_FRAME;
+ } else { /* start of packet, validate the frame header */
+ const u8 *addr;
+
+check_as_first:
+ rx_ring->next_to_clean = frame_num;
+
+ /* validate the first packet has a valid frame count */
+ if (unlikely(frame_count == 0 ||
+ frame_count > (TBT_NET_NUM_RX_BUFS / 4))) {
+ ++port->stats.rx_length_errors;
+ goto err;
+ }
+
+ /* validate the first packet has a valid frame index */
+ if (hdr->frame_index != 0) {
+ ++port->stats.rx_missed_errors;
+ goto err;
+ }
+
+ BUILD_BUG_ON(TBT_NET_RX_HDR_SIZE > TBT_RING_MAX_FRM_DATA_SZ);
+ if ((frame_count > 1) && (frame_size < TBT_NET_RX_HDR_SIZE)) {
+ ++port->stats.rx_length_errors;
+ goto err;
+ }
+
+ addr = (u8 *)(hdr + 1);
+
+ /* check the packet can go through the filter */
+ if (is_multicast_ether_addr(addr)) {
+ if (!is_broadcast_ether_addr(addr)) {
+ if ((port->packet_filters &
+ (BIT(PACKET_TYPE_PROMISCUOUS) |
+ BIT(PACKET_TYPE_ALL_MULTICAST))) ||
+ tbt_net_multicast_mac_set(
+ port->multicast_hash_table, addr))
+ res = GOOD_AS_FIRST_MULTICAST_FRAME;
+ else
+ goto err;
+ }
+ } else if (!(port->packet_filters &
+ (BIT(PACKET_TYPE_PROMISCUOUS) |
+ BIT(PACKET_TYPE_UNICAST_PROMISCUOUS))) &&
+ !ether_addr_equal(port->net_dev->dev_addr, addr)) {
+ goto err;
+ }
+
+ *size = frame_size;
+ *count = frame_count;
+ *id = le16_to_cpu(hdr->frame_id);
+ }
+
+#if (PREFETCH_STRIDE < 128)
+ prefetch((u8 *)hdr + PREFETCH_STRIDE);
+#endif
+
+ return res;
+
+err:
+ rx_ring->next_to_clean = (frame_num + 1) & (TBT_NET_NUM_RX_BUFS - 1);
+ return FRAME_ERROR;
+}
+
+static inline unsigned int tbt_net_max_frm_data_size(
+ __maybe_unused u32 frame_size)
+{
+#if (TBT_NUM_FRAMES_PER_PAGE > 1)
+ return ALIGN(frame_size + sizeof(struct tbt_frame_header),
+ L1_CACHE_BYTES) -
+ sizeof(struct tbt_frame_header);
+#else
+ return TBT_RING_MAX_FRM_DATA_SZ;
+#endif
+}
+
+static int tbt_net_poll(struct napi_struct *napi, int budget)
+{
+ struct tbt_port *port = container_of(napi, struct tbt_port, napi);
+ void __iomem *reg = TBT_RING_CONS_PROD_REG(port->nhi_ctxt->iobase,
+ REG_RX_RING_BASE,
+ port->local_path);
+ struct tbt_desc_ring *rx_ring = &port->rx_ring;
+ u16 cleaned_count = TBT_NUM_BUFS_BETWEEN(rx_ring->last_allocated,
+ rx_ring->next_to_clean,
+ TBT_NET_NUM_RX_BUFS);
+ unsigned long flags;
+ int rx_packets = 0;
+
+loop:
+ while (likely(rx_packets < budget)) {
+ struct sk_buff *skb;
+ enum frame_status status;
+ bool multicast = false;
+ u32 frame_count = 0, size;
+ u16 j, frame_id;
+ int i;
+
+ /*
+ * return some buffers to hardware, one at a time is too slow
+ * so allocate TBT_NET_RX_BUFFER_WRITE buffers at the same time
+ */
+ if (cleaned_count >= TBT_NET_RX_BUFFER_WRITE) {
+ tbt_net_alloc_rx_buffers(&port->nhi_ctxt->pdev->dev,
+ rx_ring, cleaned_count, reg,
+ GFP_ATOMIC);
+ cleaned_count = 0;
+ }
+
+ status = tbt_net_check_frame(port, rx_ring->next_to_clean,
+ &frame_count, 0, &frame_id,
+ &size);
+ if (status == FRAME_NOT_READY)
+ break;
+
+ if (status == FRAME_ERROR) {
+ ++cleaned_count;
+ continue;
+ }
+
+ multicast = (status == GOOD_AS_FIRST_MULTICAST_FRAME);
+
+ /*
+ * i is incremented up to the frame_count frames received,
+ * j cyclicly goes over the location from the next frame
+ * to clean in the ring
+ */
+ j = (rx_ring->next_to_clean + 1);
+ j &= (TBT_NET_NUM_RX_BUFS - 1);
+ for (i = 1; i < frame_count; ++i) {
+ status = tbt_net_check_frame(port, j, &frame_count, i,
+ &frame_id, &size);
+ if (status == FRAME_NOT_READY)
+ goto out;
+
+ j = (j + 1) & (TBT_NET_NUM_RX_BUFS - 1);
+
+ /* if a new frame is found, start over */
+ if (status == GOOD_AS_FIRST_FRAME ||
+ status == GOOD_AS_FIRST_MULTICAST_FRAME) {
+ multicast = (status ==
+ GOOD_AS_FIRST_MULTICAST_FRAME);
+ cleaned_count += i;
+ i = 0;
+ continue;
+ }
+
+ if (status == FRAME_ERROR) {
+ cleaned_count += (i + 1);
+ goto loop;
+ }
+ }
+
+ /* allocate a skb to store the frags */
+ skb = netdev_alloc_skb_ip_align(port->net_dev,
+ TBT_NET_RX_HDR_SIZE);
+ if (unlikely(!skb))
+ break;
+
+ /*
+ * we will be copying header into skb->data in
+ * tbt_net_pull_tail so it is in our interest to prefetch
+ * it now to avoid a possible cache miss
+ */
+ prefetchw(skb->data);
+
+ /*
+ * if overall size of packet smaller than TBT_NET_RX_HDR_SIZE
+ * which is a small buffer size we decided to allocate
+ * as the base to RX
+ */
+ if (size <= TBT_NET_RX_HDR_SIZE) {
+ struct tbt_buffer *buf =
+ &(rx_ring->buffers[rx_ring->next_to_clean]);
+ u8 *va = page_address(buf->page) + buf->page_offset +
+ sizeof(struct tbt_frame_header);
+
+ memcpy(__skb_put(skb, size), va,
+ ALIGN(size, sizeof(long)));
+
+ /*
+ * Reuse buffer as-is,
+ * just make sure it is local
+ * Access to local memory is faster than non-local
+ * memory so let's reuse.
+ * If not local, let's free it and reallocate later.
+ */
+ if (likely(page_to_nid(buf->page) == numa_node_id()))
+ /* sync the buffer for use by the device */
+ dma_sync_single_range_for_device(
+ &port->nhi_ctxt->pdev->dev,
+ buf->dma, buf->page_offset,
+ TBT_RING_MAX_FRAME_SIZE,
+ DMA_FROM_DEVICE);
+ else {
+ /* this page cannot be reused so discard it */
+ put_page(buf->page);
+ buf->page = NULL;
+ dma_unmap_page(&port->nhi_ctxt->pdev->dev,
+ buf->dma, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ }
+ rx_ring->next_to_clean = (rx_ring->next_to_clean + 1) &
+ (TBT_NET_NUM_RX_BUFS - 1);
+ } else {
+ for (i = 0; i < frame_count; ++i) {
+ struct tbt_buffer *buf = &(rx_ring->buffers[
+ rx_ring->next_to_clean]);
+ struct tbt_frame_header *hdr =
+ page_address(buf->page) +
+ buf->page_offset;
+ u32 frm_size = le32_to_cpu(hdr->frame_size);
+
+ unsigned int truesize =
+ tbt_net_max_frm_data_size(frm_size);
+
+ /* add frame to skb struct */
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
+ buf->page,
+ sizeof(struct tbt_frame_header)
+ + buf->page_offset,
+ frm_size, truesize);
+
+#if (TBT_NUM_FRAMES_PER_PAGE > 1)
+ /* move offset up to the next cache line */
+ buf->page_offset += (truesize +
+ sizeof(struct tbt_frame_header));
+
+ /*
+ * we can reuse buffer if there is space
+ * available and it is local
+ */
+ if (page_to_nid(buf->page) == numa_node_id()
+ && buf->page_offset <=
+ PAGE_SIZE - TBT_RING_MAX_FRAME_SIZE) {
+ /*
+ * bump ref count on page before
+ * it is given to the stack
+ */
+ get_page(buf->page);
+ /*
+ * sync the buffer for use by the
+ * device
+ */
+ dma_sync_single_range_for_device(
+ &port->nhi_ctxt->pdev->dev,
+ buf->dma, buf->page_offset,
+ TBT_RING_MAX_FRAME_SIZE,
+ DMA_FROM_DEVICE);
+ } else
+#endif
+ {
+ buf->page = NULL;
+ dma_unmap_page(
+ &port->nhi_ctxt->pdev->dev,
+ buf->dma, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ }
+
+ rx_ring->next_to_clean =
+ (rx_ring->next_to_clean + 1) &
+ (TBT_NET_NUM_RX_BUFS - 1);
+ }
+ /*
+ * place header from the first
+ * fragment in linear portion of buffer
+ */
+ tbt_net_pull_tail(skb);
+ }
+
+ /*
+ * The Thunderbolt medium doesn't have any restriction on
+ * minimum frame size, thus doesn't need any padding in
+ * transmit.
+ * The network stack accepts Runt Ethernet frames,
+ * therefor there is neither padding in receive.
+ */
+
+ skb->protocol = eth_type_trans(skb, port->net_dev);
+ napi_gro_receive(&port->napi, skb);
+
+ ++rx_packets;
+ port->stats.rx_bytes += size;
+ if (multicast)
+ ++port->stats.multicast;
+ cleaned_count += frame_count;
+ }
+
+out:
+ port->stats.rx_packets += rx_packets;
+
+ if (cleaned_count)
+ tbt_net_alloc_rx_buffers(&port->nhi_ctxt->pdev->dev,
+ rx_ring, cleaned_count, reg,
+ GFP_ATOMIC);
+
+ /* If all work not completed, return budget and keep polling */
+ if (rx_packets >= budget)
+ return budget;
+
+ /* Work is done so exit the polling mode and re-enable the interrupt */
+ napi_complete(napi);
+
+ spin_lock_irqsave(&port->nhi_ctxt->lock, flags);
+ /* enable RX interrupt */
+ RING_INT_ENABLE_RX(port->nhi_ctxt->iobase, port->local_path,
+ port->nhi_ctxt->num_paths);
+
+ spin_unlock_irqrestore(&port->nhi_ctxt->lock, flags);
+
+ return 0;
+}
+
+static int tbt_net_open(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ int res = 0;
+ int i, j;
+
+ /* change link state to off until path establishment finishes */
+ netif_carrier_off(net_dev);
+
+ /*
+ * if we previously succeeded to allocate msix entries,
+ * now request IRQ for them:
+ * 2=tx data port 0,
+ * 3=rx data port 0,
+ * 4=tx data port 1,
+ * 5=rx data port 1,
+ * ...
+ * if not, if msi is used, nhi_msi will handle icm & data paths
+ */
+ if (port->nhi_ctxt->msix_entries) {
+ char name[] = "tbt-net-xx-xx";
+
+ scnprintf(name, sizeof(name), "tbt-net-rx-%02u", port->num);
+ res = devm_request_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[3+(port->num*2)].vector,
+ tbt_net_rx_msix, 0, name, port);
+ if (res) {
+ netif_err(port, ifup, net_dev, "request_irq %s failed %d\n",
+ name, res);
+ goto out;
+ }
+ name[8] = 't';
+ res = devm_request_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[2+(port->num*2)].vector,
+ tbt_net_tx_msix, 0, name, port);
+ if (res) {
+ netif_err(port, ifup, net_dev, "request_irq %s failed %d\n",
+ name, res);
+ goto request_irq_failure;
+ }
+ }
+ /*
+ * Verifying that all buffer sizes are well defined.
+ * Starting with frame(s) will not tip over the
+ * page boundary
+ */
+ BUILD_BUG_ON(TBT_NUM_FRAMES_PER_PAGE < 1);
+ /*
+ * Just to make sure we have enough place for containing
+ * 3 max MTU packets for TX
+ */
+ BUILD_BUG_ON((TBT_NET_NUM_TX_BUFS * TBT_RING_MAX_FRAME_SIZE) <
+ (TBT_NET_MTU * 3));
+ /* make sure the number of TX Buffers is power of 2 */
+ BUILD_BUG_ON_NOT_POWER_OF_2(TBT_NET_NUM_TX_BUFS);
+ /*
+ * Just to make sure we have enough place for containing
+ * 3 max MTU packets for RX
+ */
+ BUILD_BUG_ON((TBT_NET_NUM_RX_BUFS * TBT_RING_MAX_FRAME_SIZE) <
+ (TBT_NET_MTU * 3));
+ /* make sure the number of RX Buffers is power of 2 */
+ BUILD_BUG_ON_NOT_POWER_OF_2(TBT_NET_NUM_RX_BUFS);
+
+ port->rx_ring.last_allocated = TBT_NET_NUM_RX_BUFS - 1;
+
+ port->tx_ring.buffers = vzalloc(TBT_NET_NUM_TX_BUFS *
+ sizeof(struct tbt_buffer));
+ if (!port->tx_ring.buffers)
+ goto ring_alloc_failure;
+ port->rx_ring.buffers = vzalloc(TBT_NET_NUM_RX_BUFS *
+ sizeof(struct tbt_buffer));
+ if (!port->rx_ring.buffers)
+ goto ring_alloc_failure;
+
+ /*
+ * Allocate TX and RX descriptors
+ * if the total size is less than a page, do a central allocation
+ * Otherwise, split TX and RX
+ */
+ if (TBT_NET_SIZE_TOTAL_DESCS <= PAGE_SIZE) {
+ port->tx_ring.desc = dmam_alloc_coherent(
+ &port->nhi_ctxt->pdev->dev,
+ TBT_NET_SIZE_TOTAL_DESCS,
+ &port->tx_ring.dma,
+ GFP_KERNEL | __GFP_ZERO);
+ if (!port->tx_ring.desc)
+ goto ring_alloc_failure;
+ /* RX starts where TX finishes */
+ port->rx_ring.desc = &port->tx_ring.desc[TBT_NET_NUM_TX_BUFS];
+ port->rx_ring.dma = port->tx_ring.dma +
+ (TBT_NET_NUM_TX_BUFS * sizeof(struct tbt_buf_desc));
+ } else {
+ port->tx_ring.desc = dmam_alloc_coherent(
+ &port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_TX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ &port->tx_ring.dma,
+ GFP_KERNEL | __GFP_ZERO);
+ if (!port->tx_ring.desc)
+ goto ring_alloc_failure;
+ port->rx_ring.desc = dmam_alloc_coherent(
+ &port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_RX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ &port->rx_ring.dma,
+ GFP_KERNEL | __GFP_ZERO);
+ if (!port->rx_ring.desc)
+ goto rx_desc_alloc_failure;
+ }
+
+ /* allocate TX buffers and configure the descriptors */
+ for (i = 0; i < TBT_NET_NUM_TX_BUFS; i++) {
+ port->tx_ring.buffers[i].hdr = dma_alloc_coherent(
+ &port->nhi_ctxt->pdev->dev,
+ TBT_NUM_FRAMES_PER_PAGE * TBT_RING_MAX_FRAME_SIZE,
+ &port->tx_ring.buffers[i].dma,
+ GFP_KERNEL);
+ if (!port->tx_ring.buffers[i].hdr)
+ goto buffers_alloc_failure;
+
+ port->tx_ring.desc[i].phys =
+ cpu_to_le64(port->tx_ring.buffers[i].dma);
+ port->tx_ring.desc[i].attributes =
+ cpu_to_le32(DESC_ATTR_REQ_STS |
+ TBT_NET_DESC_ATTR_SOF_EOF);
+
+ /*
+ * In case the page is bigger than the frame size,
+ * make the next buffer descriptor points
+ * on the next frame memory address within the page
+ */
+ for (i++, j = 1; (i < TBT_NET_NUM_TX_BUFS) &&
+ (j < TBT_NUM_FRAMES_PER_PAGE); i++, j++) {
+ port->tx_ring.buffers[i].dma =
+ port->tx_ring.buffers[i - 1].dma +
+ TBT_RING_MAX_FRAME_SIZE;
+ port->tx_ring.buffers[i].hdr =
+ (void *)(port->tx_ring.buffers[i - 1].hdr) +
+ TBT_RING_MAX_FRAME_SIZE;
+ /* move the next offset i.e. TBT_RING_MAX_FRAME_SIZE */
+ port->tx_ring.buffers[i].page_offset =
+ port->tx_ring.buffers[i - 1].page_offset +
+ TBT_RING_MAX_FRAME_SIZE;
+ port->tx_ring.desc[i].phys =
+ cpu_to_le64(port->tx_ring.buffers[i].dma);
+ port->tx_ring.desc[i].attributes =
+ cpu_to_le32(DESC_ATTR_REQ_STS |
+ TBT_NET_DESC_ATTR_SOF_EOF);
+ }
+ i--;
+ }
+
+ port->negotiation_status =
+ BIT(port->nhi_ctxt->net_devices[port->num].medium_sts);
+ if (port->negotiation_status == BIT(MEDIUM_READY_FOR_CONNECTION)) {
+ port->login_retry_count = 0;
+ queue_delayed_work(port->nhi_ctxt->net_workqueue,
+ &port->login_retry_work, 0);
+ }
+
+ netif_info(port, ifup, net_dev, "Thunderbolt(TM) Networking port %u - ready for ThunderboltIP negotiation\n",
+ port->num);
+ return 0;
+
+buffers_alloc_failure:
+ /*
+ * Rollback the Tx buffers that were already allocated
+ * until the failure
+ */
+ for (i--; i >= 0; i--) {
+ /* free only for first buffer allocation */
+ if (port->tx_ring.buffers[i].page_offset == 0)
+ dma_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NUM_FRAMES_PER_PAGE *
+ TBT_RING_MAX_FRAME_SIZE,
+ port->tx_ring.buffers[i].hdr,
+ port->tx_ring.buffers[i].dma);
+ port->tx_ring.buffers[i].hdr = NULL;
+ }
+ /*
+ * For central allocation, free all
+ * otherwise free RX and then TX separately
+ */
+ if (TBT_NET_SIZE_TOTAL_DESCS <= PAGE_SIZE) {
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_SIZE_TOTAL_DESCS,
+ port->tx_ring.desc,
+ port->tx_ring.dma);
+ port->rx_ring.desc = NULL;
+ } else {
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_RX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ port->rx_ring.desc,
+ port->rx_ring.dma);
+ port->rx_ring.desc = NULL;
+rx_desc_alloc_failure:
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_TX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ port->tx_ring.desc,
+ port->tx_ring.dma);
+ }
+ port->tx_ring.desc = NULL;
+ring_alloc_failure:
+ vfree(port->tx_ring.buffers);
+ port->tx_ring.buffers = NULL;
+ vfree(port->rx_ring.buffers);
+ port->rx_ring.buffers = NULL;
+ res = -ENOMEM;
+ netif_err(port, ifup, net_dev, "Thunderbolt(TM) Networking port %u - unable to allocate memory\n",
+ port->num);
+
+ if (!port->nhi_ctxt->msix_entries)
+ goto out;
+
+ devm_free_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[2 + (port->num * 2)].vector,
+ port);
+request_irq_failure:
+ devm_free_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[3 + (port->num * 2)].vector,
+ port);
+out:
+ return res;
+}
+
+static int tbt_net_close(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ int i;
+
+ /*
+ * Close connection, disable rings, flow controls
+ * and interrupts
+ */
+ tbt_net_tear_down(net_dev, !(port->negotiation_status &
+ BIT(RECEIVE_LOGOUT)));
+
+ cancel_work_sync(&port->login_response_work);
+ cancel_work_sync(&port->logout_work);
+ cancel_work_sync(&port->status_reply_work);
+ cancel_work_sync(&port->approve_inter_domain_work);
+
+ /* Rollback the Tx buffers that were allocated */
+ for (i = 0; i < TBT_NET_NUM_TX_BUFS; i++) {
+ if (port->tx_ring.buffers[i].page_offset == 0)
+ dma_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NUM_FRAMES_PER_PAGE *
+ TBT_RING_MAX_FRAME_SIZE,
+ port->tx_ring.buffers[i].hdr,
+ port->tx_ring.buffers[i].dma);
+ port->tx_ring.buffers[i].hdr = NULL;
+ }
+ /* Unmap the Rx buffers that were allocated */
+ for (i = 0; i < TBT_NET_NUM_RX_BUFS; i++)
+ if (port->rx_ring.buffers[i].page) {
+ put_page(port->rx_ring.buffers[i].page);
+ port->rx_ring.buffers[i].page = NULL;
+ dma_unmap_page(&port->nhi_ctxt->pdev->dev,
+ port->rx_ring.buffers[i].dma, PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ }
+
+ /*
+ * For central allocation, free all
+ * otherwise free RX and then TX separately
+ */
+ if (TBT_NET_SIZE_TOTAL_DESCS <= PAGE_SIZE) {
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_SIZE_TOTAL_DESCS,
+ port->tx_ring.desc,
+ port->tx_ring.dma);
+ port->rx_ring.desc = NULL;
+ } else {
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_RX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ port->rx_ring.desc,
+ port->rx_ring.dma);
+ port->rx_ring.desc = NULL;
+ dmam_free_coherent(&port->nhi_ctxt->pdev->dev,
+ TBT_NET_NUM_TX_BUFS *
+ sizeof(struct tbt_buf_desc),
+ port->tx_ring.desc,
+ port->tx_ring.dma);
+ }
+ port->tx_ring.desc = NULL;
+
+ vfree(port->tx_ring.buffers);
+ port->tx_ring.buffers = NULL;
+ vfree(port->rx_ring.buffers);
+ port->rx_ring.buffers = NULL;
+
+ devm_free_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[3 + (port->num * 2)].vector,
+ port);
+ devm_free_irq(&port->nhi_ctxt->pdev->dev,
+ port->nhi_ctxt->msix_entries[2 + (port->num * 2)].vector,
+ port);
+
+ netif_info(port, ifdown, net_dev, "Thunderbolt(TM) Networking port %u - is down\n",
+ port->num);
+
+ return 0;
+}
+
+static bool tbt_net_xmit_csum(struct sk_buff *skb,
+ struct tbt_desc_ring *tx_ring, u32 first,
+ u32 last, u32 frame_count)
+{
+
+ struct tbt_frame_header *hdr = tx_ring->buffers[first].hdr;
+ __wsum wsum = (__force __wsum)htonl(skb->len -
+ skb_transport_offset(skb));
+ int offset = skb_transport_offset(skb);
+ __sum16 *tucso; /* TCP UDP Checksum Segment Offset */
+ __be16 protocol = skb->protocol;
+ u8 *dest = (u8 *)(hdr + 1);
+ int len;
+
+ if (skb->ip_summed != CHECKSUM_PARTIAL) {
+ for (; first != last;
+ first = (first + 1) & (TBT_NET_NUM_TX_BUFS - 1)) {
+ hdr = tx_ring->buffers[first].hdr;
+ hdr->frame_count = cpu_to_le32(frame_count);
+ }
+ return true;
+ }
+
+ if (protocol == htons(ETH_P_8021Q)) {
+ struct vlan_hdr *vhdr, vh;
+
+ vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(vh), &vh);
+ if (!vhdr)
+ return false;
+
+ protocol = vhdr->h_vlan_encapsulated_proto;
+ }
+
+ /*
+ * Data points on the beginning of packet.
+ * Check is the checksum absolute place in the
+ * packet.
+ * ipcso will update IP checksum.
+ * tucso will update TCP/UPD checksum.
+ */
+ if (protocol == htons(ETH_P_IP)) {
+ __sum16 *ipcso = (__sum16 *)(dest +
+ ((u8 *)&(ip_hdr(skb)->check) - skb->data));
+
+ *ipcso = 0;
+ *ipcso = ip_fast_csum(dest + skb_network_offset(skb),
+ ip_hdr(skb)->ihl);
+ if (ip_hdr(skb)->protocol == IPPROTO_TCP)
+ tucso = (__sum16 *)(dest +
+ ((u8 *)&(tcp_hdr(skb)->check) - skb->data));
+ else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
+ tucso = (__sum16 *)(dest +
+ ((u8 *)&(udp_hdr(skb)->check) - skb->data));
+ else
+ return false;
+
+ *tucso = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+ ip_hdr(skb)->daddr, 0,
+ ip_hdr(skb)->protocol, 0);
+ } else if (skb_is_gso(skb)) {
+ if (skb_is_gso_v6(skb)) {
+ tucso = (__sum16 *)(dest +
+ ((u8 *)&(tcp_hdr(skb)->check) - skb->data));
+ *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ 0, IPPROTO_TCP, 0);
+ } else if ((protocol == htons(ETH_P_IPV6)) &&
+ (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)) {
+ tucso = (__sum16 *)(dest +
+ ((u8 *)&(udp_hdr(skb)->check) - skb->data));
+ *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ 0, IPPROTO_UDP, 0);
+ } else {
+ return false;
+ }
+ } else if (protocol == htons(ETH_P_IPV6)) {
+ tucso = (__sum16 *)(dest + skb_checksum_start_offset(skb) +
+ skb->csum_offset);
+ *tucso = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+ &ipv6_hdr(skb)->daddr,
+ 0, ipv6_hdr(skb)->nexthdr, 0);
+ } else {
+ return false;
+ }
+
+ /* First frame was headers, rest of the frames is data */
+ for (; first != last; first = (first + 1) & (TBT_NET_NUM_TX_BUFS - 1),
+ offset = 0) {
+ hdr = tx_ring->buffers[first].hdr;
+ dest = (u8 *)(hdr + 1) + offset;
+ len = le32_to_cpu(hdr->frame_size) - offset;
+ wsum = csum_partial(dest, len, wsum);
+ hdr->frame_count = cpu_to_le32(frame_count);
+ }
+ *tucso = csum_fold(wsum);
+
+ return true;
+}
+
+static netdev_tx_t tbt_net_xmit_frame(struct sk_buff *skb,
+ struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ void __iomem *iobase = port->nhi_ctxt->iobase;
+ void __iomem *reg = TBT_RING_CONS_PROD_REG(iobase,
+ REG_TX_RING_BASE,
+ port->local_path);
+ struct tbt_desc_ring *tx_ring = &port->tx_ring;
+ struct tbt_frame_header *hdr;
+ u32 prod_cons, prod, cons, first;
+ /* len equivalent to the fragment length */
+ unsigned int len = skb_headlen(skb);
+ /* data_len is overall packet length */
+ unsigned int data_len = skb->len;
+ u32 frm_idx, frag_num = 0;
+ const u8 *src = skb->data;
+ bool unmap = false;
+ __le32 *attr;
+ u8 *dest;
+
+ if (unlikely(data_len == 0 || data_len > TBT_NET_MTU))
+ goto invalid_packet;
+
+ prod_cons = ioread32(reg);
+ prod = TBT_REG_RING_PROD_EXTRACT(prod_cons);
+ cons = TBT_REG_RING_CONS_EXTRACT(prod_cons);
+ if (prod >= TBT_NET_NUM_TX_BUFS || cons >= TBT_NET_NUM_TX_BUFS)
+ goto tx_error;
+
+ if (data_len > (TBT_NUM_BUFS_BETWEEN(prod, cons, TBT_NET_NUM_TX_BUFS) *
+ TBT_RING_MAX_FRM_DATA_SZ)) {
+ unsigned long flags;
+
+ netif_stop_queue(net_dev);
+
+ spin_lock_irqsave(&port->nhi_ctxt->lock, flags);
+ /*
+ * Enable TX interrupt to be notified about available buffers
+ * and restart transmission upon this.
+ */
+ RING_INT_ENABLE_TX(iobase, port->local_path);
+ spin_unlock_irqrestore(&port->nhi_ctxt->lock, flags);
+
+ return NETDEV_TX_BUSY;
+ }
+
+ first = prod;
+ attr = &tx_ring->desc[prod].attributes;
+ hdr = tx_ring->buffers[prod].hdr;
+ dest = (u8 *)(hdr + 1);
+ /* if overall packet is bigger than the frame data size */
+ for (frm_idx = 0; data_len > TBT_RING_MAX_FRM_DATA_SZ; ++frm_idx) {
+ u32 size_left = TBT_RING_MAX_FRM_DATA_SZ;
+
+ *attr &= cpu_to_le32(~(DESC_ATTR_LEN_MASK |
+ DESC_ATTR_INT_EN |
+ DESC_ATTR_DESC_DONE));
+ hdr->frame_size = cpu_to_le32(TBT_RING_MAX_FRM_DATA_SZ);
+ hdr->frame_index = cpu_to_le16(frm_idx);
+ hdr->frame_id = cpu_to_le16(port->frame_id);
+
+ do {
+ if (len > size_left) {
+ /*
+ * Copy data onto tx buffer data with full
+ * frame size then break
+ * and go to next frame
+ */
+ memcpy(dest, src, size_left);
+ len -= size_left;
+ dest += size_left;
+ src += size_left;
+ break;
+ }
+
+ memcpy(dest, src, len);
+ size_left -= len;
+ dest += len;
+
+ if (unmap) {
+ kunmap_atomic((void *)src);
+ unmap = false;
+ }
+ /*
+ * Ensure all fragments have been processed
+ */
+ if (frag_num < skb_shinfo(skb)->nr_frags) {
+ const skb_frag_t *frag =
+ &(skb_shinfo(skb)->frags[frag_num]);
+ len = skb_frag_size(frag);
+ /* map and then unmap quickly */
+ src = kmap_atomic(skb_frag_page(frag)) +
+ frag->page_offset;
+ unmap = true;
+ ++frag_num;
+ } else if (unlikely(size_left > 0)) {
+ goto invalid_packet;
+ }
+ } while (size_left > 0);
+
+ data_len -= TBT_RING_MAX_FRM_DATA_SZ;
+ prod = (prod + 1) & (TBT_NET_NUM_TX_BUFS - 1);
+ attr = &tx_ring->desc[prod].attributes;
+ hdr = tx_ring->buffers[prod].hdr;
+ dest = (u8 *)(hdr + 1);
+ }
+
+ *attr &= cpu_to_le32(~(DESC_ATTR_LEN_MASK | DESC_ATTR_DESC_DONE));
+ /* Enable the interrupts, for resuming from stop queue later (if so) */
+ *attr |= cpu_to_le32(DESC_ATTR_INT_EN |
+ (((sizeof(struct tbt_frame_header) + data_len) <<
+ DESC_ATTR_LEN_SHIFT) & DESC_ATTR_LEN_MASK));
+ hdr->frame_size = cpu_to_le32(data_len);
+ hdr->frame_index = cpu_to_le16(frm_idx);
+ hdr->frame_id = cpu_to_le16(port->frame_id);
+
+ /* In case the remaining data_len is smaller than a frame */
+ while (len < data_len) {
+ memcpy(dest, src, len);
+ data_len -= len;
+ dest += len;
+
+ if (unmap) {
+ kunmap_atomic((void *)src);
+ unmap = false;
+ }
+
+ if (frag_num < skb_shinfo(skb)->nr_frags) {
+ const skb_frag_t *frag =
+ &(skb_shinfo(skb)->frags[frag_num]);
+ len = skb_frag_size(frag);
+ src = kmap_atomic(skb_frag_page(frag)) +
+ frag->page_offset;
+ unmap = true;
+ ++frag_num;
+ } else if (unlikely(data_len > 0)) {
+ goto invalid_packet;
+ }
+ }
+ memcpy(dest, src, data_len);
+ if (unmap) {
+ kunmap_atomic((void *)src);
+ unmap = false;
+ }
+
+ ++frm_idx;
+ prod = (prod + 1) & (TBT_NET_NUM_TX_BUFS - 1);
+
+ if (!tbt_net_xmit_csum(skb, tx_ring, first, prod, frm_idx))
+ goto invalid_packet;
+
+ if (port->match_frame_id)
+ ++port->frame_id;
+
+ prod_cons &= ~REG_RING_PROD_MASK;
+ prod_cons |= (prod << REG_RING_PROD_SHIFT) & REG_RING_PROD_MASK;
+ wmb(); /* make sure producer update is done after buffers are ready */
+ iowrite32(prod_cons, reg);
+
+ ++port->stats.tx_packets;
+ port->stats.tx_bytes += skb->len;
+
+ dev_consume_skb_any(skb);
+ return NETDEV_TX_OK;
+
+invalid_packet:
+ netif_err(port, tx_err, net_dev, "port %u invalid transmit packet\n",
+ port->num);
+tx_error:
+ ++port->stats.tx_errors;
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
}

+static void tbt_net_set_rx_mode(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ struct netdev_hw_addr *ha;
+
+ if (net_dev->flags & IFF_PROMISC)
+ port->packet_filters |= BIT(PACKET_TYPE_PROMISCUOUS);
+ else
+ port->packet_filters &= ~BIT(PACKET_TYPE_PROMISCUOUS);
+ if (net_dev->flags & IFF_ALLMULTI)
+ port->packet_filters |= BIT(PACKET_TYPE_ALL_MULTICAST);
+ else
+ port->packet_filters &= ~BIT(PACKET_TYPE_ALL_MULTICAST);
+
+ /* if you have more than a single MAC address */
+ if (netdev_uc_count(net_dev) > 1)
+ port->packet_filters |= BIT(PACKET_TYPE_UNICAST_PROMISCUOUS);
+ /* if have a single MAC address */
+ else if (netdev_uc_count(net_dev) == 1) {
+ netdev_for_each_uc_addr(ha, net_dev)
+ /* checks whether the MAC is what we set */
+ if (ether_addr_equal(ha->addr, net_dev->dev_addr))
+ port->packet_filters &=
+ ~BIT(PACKET_TYPE_UNICAST_PROMISCUOUS);
+ else
+ port->packet_filters |=
+ BIT(PACKET_TYPE_UNICAST_PROMISCUOUS);
+ } else {
+ port->packet_filters &= ~BIT(PACKET_TYPE_UNICAST_PROMISCUOUS);
+ }
+
+ /* Populate the multicast hash table with received MAC addresses */
+ memset(port->multicast_hash_table, 0,
+ sizeof(port->multicast_hash_table));
+ netdev_for_each_mc_addr(ha, net_dev) {
+ u16 hash_val = TBT_NET_ETHER_ADDR_HASH(ha->addr);
+
+ port->multicast_hash_table[hash_val / BITS_PER_U32] |=
+ BIT(hash_val % BITS_PER_U32);
+ }
+
+}
+
+static struct rtnl_link_stats64 *tbt_net_get_stats64(
+ struct net_device *net_dev,
+ struct rtnl_link_stats64 *stats)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ memset(stats, 0, sizeof(*stats));
+ stats->tx_packets = port->stats.tx_packets;
+ stats->tx_bytes = port->stats.tx_bytes;
+ stats->tx_errors = port->stats.tx_errors;
+ stats->rx_packets = port->stats.rx_packets;
+ stats->rx_bytes = port->stats.rx_bytes;
+ stats->rx_length_errors = port->stats.rx_length_errors;
+ stats->rx_over_errors = port->stats.rx_over_errors;
+ stats->rx_crc_errors = port->stats.rx_crc_errors;
+ stats->rx_missed_errors = port->stats.rx_missed_errors;
+ stats->rx_errors = stats->rx_length_errors + stats->rx_over_errors +
+ stats->rx_crc_errors + stats->rx_missed_errors;
+ stats->multicast = port->stats.multicast;
+ return stats;
+}
+
+static int tbt_net_set_mac_address(struct net_device *net_dev, void *addr)
+{
+ struct sockaddr *saddr = addr;
+
+ if (!is_valid_ether_addr(saddr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ memcpy(net_dev->dev_addr, saddr->sa_data, net_dev->addr_len);
+
+ return 0;
+}
+
+static int tbt_net_change_mtu(struct net_device *net_dev, int new_mtu)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ /* MTU < 68 is an error and causes problems on some kernels */
+ if (new_mtu < 68 || new_mtu > (TBT_NET_MTU - ETH_HLEN))
+ return -EINVAL;
+
+ netif_info(port, probe, net_dev, "Thunderbolt(TM) Networking port %u - changing MTU from %u to %d\n",
+ port->num, net_dev->mtu, new_mtu);
+
+ net_dev->mtu = new_mtu;
+
+ return 0;
+}
+
+static const struct net_device_ops tbt_netdev_ops = {
+ /* called when the network is up'ed */
+ .ndo_open = tbt_net_open,
+ /* called when the network is down'ed */
+ .ndo_stop = tbt_net_close,
+ .ndo_start_xmit = tbt_net_xmit_frame,
+ .ndo_set_rx_mode = tbt_net_set_rx_mode,
+ .ndo_get_stats64 = tbt_net_get_stats64,
+ .ndo_set_mac_address = tbt_net_set_mac_address,
+ .ndo_change_mtu = tbt_net_change_mtu,
+ .ndo_validate_addr = eth_validate_addr,
+};
+
+static int tbt_net_get_settings(__maybe_unused struct net_device *net_dev,
+ struct ethtool_cmd *ecmd)
+{
+ ecmd->supported |= SUPPORTED_20000baseKR2_Full;
+ ecmd->advertising |= ADVERTISED_20000baseKR2_Full;
+ ecmd->autoneg = AUTONEG_DISABLE;
+ ecmd->transceiver = XCVR_INTERNAL;
+ ecmd->supported |= SUPPORTED_FIBRE;
+ ecmd->advertising |= ADVERTISED_FIBRE;
+ ecmd->port = PORT_FIBRE;
+ ethtool_cmd_speed_set(ecmd, SPEED_20000);
+ ecmd->duplex = DUPLEX_FULL;
+
+ return 0;
+}
+
+
+static u32 tbt_net_get_msglevel(struct net_device *net_dev)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ return port->msg_enable;
+}
+
+static void tbt_net_set_msglevel(struct net_device *net_dev, u32 data)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ port->msg_enable = data;
+}
+
+static void tbt_net_get_strings(__maybe_unused struct net_device *net_dev,
+ u32 stringset, u8 *data)
+{
+ if (stringset == ETH_SS_STATS)
+ memcpy(data, tbt_net_gstrings_stats,
+ sizeof(tbt_net_gstrings_stats));
+}
+
+static void tbt_net_get_ethtool_stats(struct net_device *net_dev,
+ __maybe_unused struct ethtool_stats *sts,
+ u64 *data)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ memcpy(data, &port->stats, sizeof(port->stats));
+}
+
+static int tbt_net_get_sset_count(__maybe_unused struct net_device *net_dev,
+ int sset)
+{
+ if (sset == ETH_SS_STATS)
+ return sizeof(tbt_net_gstrings_stats) / ETH_GSTRING_LEN;
+ return -EOPNOTSUPP;
+}
+
+static void tbt_net_get_drvinfo(struct net_device *net_dev,
+ struct ethtool_drvinfo *drvinfo)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ strlcpy(drvinfo->driver, "Thunderbolt(TM) Networking",
+ sizeof(drvinfo->driver));
+ strlcpy(drvinfo->version, DRV_VERSION, sizeof(drvinfo->version));
+
+ strlcpy(drvinfo->bus_info, pci_name(port->nhi_ctxt->pdev),
+ sizeof(drvinfo->bus_info));
+ drvinfo->n_stats = tbt_net_get_sset_count(net_dev, ETH_SS_STATS);
+}
+
+static const struct ethtool_ops tbt_net_ethtool_ops = {
+ .get_settings = tbt_net_get_settings,
+ .get_drvinfo = tbt_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_msglevel = tbt_net_get_msglevel,
+ .set_msglevel = tbt_net_set_msglevel,
+ .get_strings = tbt_net_get_strings,
+ .get_ethtool_stats = tbt_net_get_ethtool_stats,
+ .get_sset_count = tbt_net_get_sset_count,
+};
+
static inline int send_message(struct tbt_port *port, const char *func,
enum pdf_value pdf, u32 msg_len,
const void *msg)
@@ -496,6 +1920,10 @@ void negotiation_events(struct net_device *net_dev,
/* configure TX ring */
reg = iobase + REG_TX_RING_BASE +
(port->local_path * REG_RING_STEP);
+ iowrite32(lower_32_bits(port->tx_ring.dma),
+ reg + REG_RING_PHYS_LO_OFFSET);
+ iowrite32(upper_32_bits(port->tx_ring.dma),
+ reg + REG_RING_PHYS_HI_OFFSET);

tx_ring_conf = (TBT_NET_NUM_TX_BUFS << REG_RING_SIZE_SHIFT) &
REG_RING_SIZE_MASK;
@@ -538,6 +1966,10 @@ void negotiation_events(struct net_device *net_dev,
*/
reg = iobase + REG_RX_RING_BASE +
(port->local_path * REG_RING_STEP);
+ iowrite32(lower_32_bits(port->rx_ring.dma),
+ reg + REG_RING_PHYS_LO_OFFSET);
+ iowrite32(upper_32_bits(port->rx_ring.dma),
+ reg + REG_RING_PHYS_HI_OFFSET);

rx_ring_conf = (TBT_NET_NUM_RX_BUFS << REG_RING_SIZE_SHIFT) &
REG_RING_SIZE_MASK;
@@ -547,6 +1979,17 @@ void negotiation_events(struct net_device *net_dev,
REG_RING_BUF_SIZE_MASK;

iowrite32(rx_ring_conf, reg + REG_RING_SIZE_OFFSET);
+ /* allocate RX buffers and configure the descriptors */
+ if (!tbt_net_alloc_rx_buffers(&port->nhi_ctxt->pdev->dev,
+ &port->rx_ring,
+ TBT_NET_NUM_RX_BUFS,
+ reg + REG_RING_CONS_PROD_OFFSET,
+ GFP_KERNEL)) {
+ netif_err(port, link, net_dev, "Thunderbolt(TM) Networking port %u - no memory for receive buffers\n",
+ port->num);
+ tbt_net_tear_down(net_dev, true);
+ break;
+ }

spin_lock_irqsave(&port->nhi_ctxt->lock, flags);
/* enable RX interrupt */
@@ -559,6 +2002,7 @@ void negotiation_events(struct net_device *net_dev,
netif_info(port, link, net_dev, "Thunderbolt(TM) Networking port %u - ready\n",
port->num);

+ napi_enable(&port->napi);
netif_carrier_on(net_dev);
netif_start_queue(net_dev);
break;
@@ -769,15 +2213,42 @@ struct net_device *nhi_alloc_etherdev(struct tbt_nhi_ctxt *nhi_ctxt,
scnprintf(net_dev->name, sizeof(net_dev->name), "tbtnet%%dp%hhu",
port_num);

+ net_dev->netdev_ops = &tbt_netdev_ops;
+
+ netif_napi_add(net_dev, &port->napi, tbt_net_poll, NAPI_POLL_WEIGHT);
+
+ net_dev->hw_features = NETIF_F_SG |
+ NETIF_F_ALL_TSO |
+ NETIF_F_UFO |
+ NETIF_F_GRO |
+ NETIF_F_IP_CSUM |
+ NETIF_F_IPV6_CSUM;
+ net_dev->features = net_dev->hw_features;
+ if (nhi_ctxt->pci_using_dac)
+ net_dev->features |= NETIF_F_HIGHDMA;
+
INIT_DELAYED_WORK(&port->login_retry_work, login_retry);
INIT_WORK(&port->login_response_work, login_response);
INIT_WORK(&port->logout_work, logout);
INIT_WORK(&port->status_reply_work, status_reply);
INIT_WORK(&port->approve_inter_domain_work, approve_inter_domain);

+ net_dev->ethtool_ops = &tbt_net_ethtool_ops;
+
+ tbt_net_change_mtu(net_dev, TBT_NET_MTU - ETH_HLEN);
+
+ if (register_netdev(net_dev))
+ goto err_register;
+
+ netif_carrier_off(net_dev);
+
netif_info(port, probe, net_dev,
"Thunderbolt(TM) Networking port %u - MAC Address: %pM\n",
port_num, net_dev->dev_addr);

return net_dev;
+
+err_register:
+ free_netdev(net_dev);
+ return NULL;
}
--
2.7.4

2016-11-09 12:22:39

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 1/8] thunderbolt: Macro rename

This first patch updates the NHI Thunderbolt controller registers file to
reflect that it is not only for Cactus Ridge.
No functional change intended.

Signed-off-by: Amir Levy <[email protected]>
Signed-off-by: Andreas Noever <[email protected]>
---
drivers/thunderbolt/nhi_regs.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/thunderbolt/nhi_regs.h b/drivers/thunderbolt/nhi_regs.h
index 86b996c..75cf069 100644
--- a/drivers/thunderbolt/nhi_regs.h
+++ b/drivers/thunderbolt/nhi_regs.h
@@ -1,11 +1,11 @@
/*
- * Thunderbolt Cactus Ridge driver - NHI registers
+ * Thunderbolt driver - NHI registers
*
* Copyright (c) 2014 Andreas Noever <[email protected]>
*/

-#ifndef DSL3510_REGS_H_
-#define DSL3510_REGS_H_
+#ifndef NHI_REGS_H_
+#define NHI_REGS_H_

#include <linux/types.h>

--
2.7.4

2016-11-09 12:23:13

by Levy, Amir (Jer)

[permalink] [raw]
Subject: [PATCH v9 4/8] thunderbolt: Networking state machine

This patch builds the peer to peer communication path.
Communication is established by a negotiation process whereby messages are
sent back and forth between the peers until a connection is established.
This includes the Thunderbolt Network driver communication with the second
peer via Intel Connection Manager(ICM) firmware.
+--------------------+ +--------------------+
|Host 1 | |Host 2 |
| | | |
| +-----------+ | | +-----------+ |
| |Thunderbolt| | | |Thunderbolt| |
| |Networking | | | |Networking | |
| |Driver | | | |Driver | |
| +-----------+ | | +-----------+ |
| ^ | | ^ |
| | | | | |
| +------------+---+ | | +------------+---+ |
| |Thunderbolt | | | | |Thunderbolt | | |
| |Controller v | | | |Controller v | |
| | +---+ | | | | +---+ | |
| | |ICM|<-+-+------------+-+-------->|ICM| | |
| | +---+ | | | | +---+ | |
| +----------------+ | | +----------------+ |
+--------------------+ +--------------------+
Note that this patch only establishes the link between the two hosts and
not Network Packet handling - this is dealt with in the next patch.

Signed-off-by: Amir Levy <[email protected]>
---
drivers/thunderbolt/icm/Makefile | 2 +-
drivers/thunderbolt/icm/icm_nhi.c | 262 ++++++++++++-
drivers/thunderbolt/icm/net.c | 783 ++++++++++++++++++++++++++++++++++++++
drivers/thunderbolt/icm/net.h | 70 ++++
4 files changed, 1109 insertions(+), 8 deletions(-)
create mode 100644 drivers/thunderbolt/icm/net.c

diff --git a/drivers/thunderbolt/icm/Makefile b/drivers/thunderbolt/icm/Makefile
index f0d0fbb..94a2797 100644
--- a/drivers/thunderbolt/icm/Makefile
+++ b/drivers/thunderbolt/icm/Makefile
@@ -1,2 +1,2 @@
obj-${CONFIG_THUNDERBOLT_ICM} += thunderbolt-icm.o
-thunderbolt-icm-objs := icm_nhi.o
+thunderbolt-icm-objs := icm_nhi.o net.o
diff --git a/drivers/thunderbolt/icm/icm_nhi.c b/drivers/thunderbolt/icm/icm_nhi.c
index c843ce8..edc910b 100644
--- a/drivers/thunderbolt/icm/icm_nhi.c
+++ b/drivers/thunderbolt/icm/icm_nhi.c
@@ -64,6 +64,13 @@ static const struct nla_policy nhi_genl_policy[NHI_ATTR_MAX + 1] = {
.len = TBT_ICM_RING_MAX_FRAME_SIZE },
[NHI_ATTR_MSG_FROM_ICM] = { .type = NLA_BINARY,
.len = TBT_ICM_RING_MAX_FRAME_SIZE },
+ [NHI_ATTR_LOCAL_ROUTE_STRING] = {
+ .len = sizeof(struct route_string) },
+ [NHI_ATTR_LOCAL_UUID] = { .len = sizeof(uuid_be) },
+ [NHI_ATTR_REMOTE_UUID] = { .len = sizeof(uuid_be) },
+ [NHI_ATTR_LOCAL_DEPTH] = { .type = NLA_U8, },
+ [NHI_ATTR_ENABLE_FULL_E2E] = { .type = NLA_FLAG, },
+ [NHI_ATTR_MATCH_FRAME_ID] = { .type = NLA_FLAG, },
};

/* NHI genetlink family */
@@ -480,6 +487,29 @@ int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit)
return 0;
}

+static inline bool nhi_is_path_disconnected(u32 cmd, u8 num_ports)
+{
+ return (cmd >= DISCONNECT_PORT_A_INTER_DOMAIN_PATH &&
+ cmd < (DISCONNECT_PORT_A_INTER_DOMAIN_PATH + num_ports));
+}
+
+static int nhi_mailbox_disconn_path(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd)
+ __releases(&controllers_list_mutex)
+{
+ struct port_net_dev *port;
+ u32 port_num = cmd - DISCONNECT_PORT_A_INTER_DOMAIN_PATH;
+
+ port = &(nhi_ctxt->net_devices[port_num]);
+ mutex_lock(&port->state_mutex);
+
+ mutex_unlock(&controllers_list_mutex);
+ port->medium_sts = MEDIUM_READY_FOR_APPROVAL;
+ if (port->net_dev)
+ negotiation_events(port->net_dev, MEDIUM_DISCONNECTED);
+ mutex_unlock(&port->state_mutex);
+ return 0;
+}
+
static int nhi_mailbox_generic(struct tbt_nhi_ctxt *nhi_ctxt, u32 mb_cmd)
__releases(&controllers_list_mutex)
{
@@ -526,13 +556,90 @@ static int nhi_genl_mailbox(__always_unused struct sk_buff *u_skb,
return -ERESTART;

nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
- if (nhi_ctxt && !nhi_ctxt->d0_exit)
- return nhi_mailbox_generic(nhi_ctxt, mb_cmd);
+ if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+
+ /* rwsem is released later by the below functions */
+ if (nhi_is_path_disconnected(cmd, nhi_ctxt->num_ports))
+ return nhi_mailbox_disconn_path(nhi_ctxt, cmd);
+ else
+ return nhi_mailbox_generic(nhi_ctxt, mb_cmd);
+
+ }

mutex_unlock(&controllers_list_mutex);
return -ENODEV;
}

+static int nhi_genl_approve_networking(__always_unused struct sk_buff *u_skb,
+ struct genl_info *info)
+{
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ struct route_string *route_str;
+ int res = -ENODEV;
+ u8 port_num;
+
+ if (!info || !info->userhdr || !info->attrs ||
+ !info->attrs[NHI_ATTR_LOCAL_ROUTE_STRING] ||
+ !info->attrs[NHI_ATTR_LOCAL_UUID] ||
+ !info->attrs[NHI_ATTR_REMOTE_UUID] ||
+ !info->attrs[NHI_ATTR_LOCAL_DEPTH])
+ return -EINVAL;
+
+ /*
+ * route_str is an unique topological address
+ * used for approving remote controller
+ */
+ route_str = nla_data(info->attrs[NHI_ATTR_LOCAL_ROUTE_STRING]);
+ /* extracts the port we're connected to */
+ port_num = PORT_NUM_FROM_LINK(L0_PORT_NUM(route_str->lo));
+
+ if (mutex_lock_interruptible(&controllers_list_mutex))
+ return -ERESTART;
+
+ nhi_ctxt = nhi_search_ctxt(*(u32 *)info->userhdr);
+ if (nhi_ctxt && !nhi_ctxt->d0_exit) {
+ struct port_net_dev *port;
+
+ if (port_num >= nhi_ctxt->num_ports) {
+ res = -EINVAL;
+ goto free_ctl_list;
+ }
+
+ port = &(nhi_ctxt->net_devices[port_num]);
+
+ mutex_lock(&port->state_mutex);
+ mutex_unlock(&controllers_list_mutex);
+
+ if (port->medium_sts != MEDIUM_READY_FOR_APPROVAL)
+ goto unlock;
+
+ port->medium_sts = MEDIUM_READY_FOR_CONNECTION;
+
+ if (!port->net_dev) {
+ port->net_dev = nhi_alloc_etherdev(nhi_ctxt, port_num,
+ info);
+ if (!port->net_dev) {
+ mutex_unlock(&port->state_mutex);
+ return -ENOMEM;
+ }
+ } else {
+ nhi_update_etherdev(nhi_ctxt, port->net_dev, info);
+
+ negotiation_events(port->net_dev,
+ MEDIUM_READY_FOR_CONNECTION);
+ }
+
+unlock:
+ mutex_unlock(&port->state_mutex);
+
+ return 0;
+ }
+
+free_ctl_list:
+ mutex_unlock(&controllers_list_mutex);
+
+ return res;
+}

static int nhi_genl_send_msg(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
const u8 *msg, u32 msg_len)
@@ -579,17 +686,127 @@ static int nhi_genl_send_msg(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
return res;
}

+static bool nhi_handle_inter_domain_msg(struct tbt_nhi_ctxt *nhi_ctxt,
+ struct thunderbolt_ip_header *hdr)
+{
+ struct port_net_dev *port;
+ u8 port_num;
+
+ const uuid_be proto_uuid = APPLE_THUNDERBOLT_IP_PROTOCOL_UUID;
+
+ if (uuid_be_cmp(proto_uuid, hdr->apple_tbt_ip_proto_uuid) != 0)
+ return true;
+
+ port_num = PORT_NUM_FROM_LINK(
+ L0_PORT_NUM(be32_to_cpu(hdr->route_str.lo)));
+
+ if (unlikely(port_num >= nhi_ctxt->num_ports))
+ return false;
+
+ port = &(nhi_ctxt->net_devices[port_num]);
+ mutex_lock(&port->state_mutex);
+ if (port->net_dev != NULL)
+ negotiation_messages(port->net_dev, hdr);
+ mutex_unlock(&port->state_mutex);
+
+ return false;
+}
+
+static void nhi_handle_notification_msg(struct tbt_nhi_ctxt *nhi_ctxt,
+ const u8 *msg)
+{
+ struct port_net_dev *port;
+ u8 port_num;
+
+#define INTER_DOMAIN_LINK_SHIFT 0
+#define INTER_DOMAIN_LINK_MASK GENMASK(2, INTER_DOMAIN_LINK_SHIFT)
+ switch (msg[3]) {
+
+ case NC_INTER_DOMAIN_CONNECTED:
+ port_num = PORT_NUM_FROM_MSG(msg[5]);
+#define INTER_DOMAIN_APPROVED BIT(3)
+ if (port_num < nhi_ctxt->num_ports &&
+ !(msg[5] & INTER_DOMAIN_APPROVED))
+ nhi_ctxt->net_devices[port_num].medium_sts =
+ MEDIUM_READY_FOR_APPROVAL;
+ break;
+
+ case NC_INTER_DOMAIN_DISCONNECTED:
+ port_num = PORT_NUM_FROM_MSG(msg[5]);
+
+ if (unlikely(port_num >= nhi_ctxt->num_ports))
+ break;
+
+ port = &(nhi_ctxt->net_devices[port_num]);
+ mutex_lock(&port->state_mutex);
+ port->medium_sts = MEDIUM_DISCONNECTED;
+
+ if (port->net_dev != NULL)
+ negotiation_events(port->net_dev,
+ MEDIUM_DISCONNECTED);
+ mutex_unlock(&port->state_mutex);
+ break;
+ }
+}
+
+static bool nhi_handle_icm_response_msg(struct tbt_nhi_ctxt *nhi_ctxt,
+ const u8 *msg)
+{
+ struct port_net_dev *port;
+ bool send_event = true;
+ u8 port_num;
+
+ if (nhi_ctxt->ignore_icm_resp &&
+ msg[3] == RC_INTER_DOMAIN_PKT_SENT) {
+ nhi_ctxt->ignore_icm_resp = false;
+ send_event = false;
+ }
+ if (nhi_ctxt->wait_for_icm_resp) {
+ nhi_ctxt->wait_for_icm_resp = false;
+ up(&nhi_ctxt->send_sem);
+ }
+
+ if (msg[3] == RC_APPROVE_INTER_DOMAIN_CONNECTION) {
+#define APPROVE_INTER_DOMAIN_ERROR BIT(0)
+ if (unlikely(msg[2] & APPROVE_INTER_DOMAIN_ERROR))
+ return send_event;
+
+ port_num = PORT_NUM_FROM_LINK((msg[5]&INTER_DOMAIN_LINK_MASK)>>
+ INTER_DOMAIN_LINK_SHIFT);
+
+ if (unlikely(port_num >= nhi_ctxt->num_ports))
+ return send_event;
+
+ port = &(nhi_ctxt->net_devices[port_num]);
+ mutex_lock(&port->state_mutex);
+ port->medium_sts = MEDIUM_CONNECTED;
+
+ if (port->net_dev != NULL)
+ negotiation_events(port->net_dev, MEDIUM_CONNECTED);
+ mutex_unlock(&port->state_mutex);
+ }
+
+ return send_event;
+}
+
static bool nhi_msg_from_icm_analysis(struct tbt_nhi_ctxt *nhi_ctxt,
enum pdf_value pdf,
const u8 *msg, u32 msg_len)
{
- /*
- * preparation for messages that won't be sent,
- * currently unused in this patch.
- */
bool send_event = true;

switch (pdf) {
+ case PDF_INTER_DOMAIN_REQUEST:
+ case PDF_INTER_DOMAIN_RESPONSE:
+ send_event = nhi_handle_inter_domain_msg(
+ nhi_ctxt,
+ (struct thunderbolt_ip_header *)msg);
+ break;
+
+ case PDF_FW_TO_SW_NOTIFICATION:
+ nhi_handle_notification_msg(nhi_ctxt, msg);
+ break;
+
case PDF_ERROR_NOTIFICATION:
/* fallthrough */
case PDF_WRITE_CONFIGURATION_REGISTERS:
@@ -599,7 +816,12 @@ static bool nhi_msg_from_icm_analysis(struct tbt_nhi_ctxt *nhi_ctxt,
nhi_ctxt->wait_for_icm_resp = false;
up(&nhi_ctxt->send_sem);
}
- /* fallthrough */
+ break;
+
+ case PDF_FW_TO_SW_RESPONSE:
+ send_event = nhi_handle_icm_response_msg(nhi_ctxt, msg);
+ break;
+
default:
break;
}
@@ -788,6 +1010,12 @@ static const struct genl_ops nhi_ops[] = {
.doit = nhi_genl_mailbox,
.flags = GENL_ADMIN_PERM,
},
+ {
+ .cmd = NHI_CMD_APPROVE_TBT_NETWORKING,
+ .policy = nhi_genl_policy,
+ .doit = nhi_genl_approve_networking,
+ .flags = GENL_ADMIN_PERM,
+ },
};

static int nhi_suspend(struct device *dev) __releases(&nhi_ctxt->send_sem)
@@ -795,6 +1023,17 @@ static int nhi_suspend(struct device *dev) __releases(&nhi_ctxt->send_sem)
struct tbt_nhi_ctxt *nhi_ctxt = pci_get_drvdata(to_pci_dev(dev));
void __iomem *rx_reg, *tx_reg;
u32 rx_reg_val, tx_reg_val;
+ int i;
+
+ for (i = 0; i < nhi_ctxt->num_ports; i++) {
+ struct port_net_dev *port = &nhi_ctxt->net_devices[i];
+
+ mutex_lock(&port->state_mutex);
+ port->medium_sts = MEDIUM_DISCONNECTED;
+ if (port->net_dev)
+ negotiation_events(port->net_dev, MEDIUM_DISCONNECTED);
+ mutex_unlock(&port->state_mutex);
+ }

/* must be after negotiation_events, since messages might be sent */
nhi_ctxt->d0_exit = true;
@@ -954,6 +1193,15 @@ static void icm_nhi_remove(struct pci_dev *pdev)

nhi_suspend(&pdev->dev);

+ for (i = 0; i < nhi_ctxt->num_ports; i++) {
+ mutex_lock(&nhi_ctxt->net_devices[i].state_mutex);
+ if (nhi_ctxt->net_devices[i].net_dev) {
+ nhi_dealloc_etherdev(nhi_ctxt->net_devices[i].net_dev);
+ nhi_ctxt->net_devices[i].net_dev = NULL;
+ }
+ mutex_unlock(&nhi_ctxt->net_devices[i].state_mutex);
+ }
+
if (nhi_ctxt->net_workqueue)
destroy_workqueue(nhi_ctxt->net_workqueue);

diff --git a/drivers/thunderbolt/icm/net.c b/drivers/thunderbolt/icm/net.c
new file mode 100644
index 0000000..beeafb3
--- /dev/null
+++ b/drivers/thunderbolt/icm/net.c
@@ -0,0 +1,783 @@
+/*******************************************************************************
+ *
+ * Intel Thunderbolt(TM) driver
+ * Copyright(c) 2014 - 2016 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ ******************************************************************************/
+
+#include <linux/etherdevice.h>
+#include <linux/crc32.h>
+#include <linux/prefetch.h>
+#include <linux/highmem.h>
+#include <linux/if_vlan.h>
+#include <linux/jhash.h>
+#include <linux/vmalloc.h>
+#include <net/ip6_checksum.h>
+#include "icm_nhi.h"
+#include "net.h"
+
+#define DEFAULT_MSG_ENABLE (NETIF_MSG_PROBE | NETIF_MSG_LINK | NETIF_MSG_IFUP)
+static int debug = -1;
+module_param(debug, int, 0000);
+MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+
+#define TBT_NET_RX_HDR_SIZE 256
+
+#define NUM_TX_LOGIN_RETRIES 60
+
+#define APPLE_THUNDERBOLT_IP_PROTOCOL_REVISION 1
+
+#define LOGIN_TX_PATH 0xf
+
+#define TBT_NET_MTU (64 * 1024)
+
+/* Number of Rx buffers we bundle into one write to the hardware */
+#define TBT_NET_RX_BUFFER_WRITE 16
+
+#define TBT_NET_MULTICAST_HASH_TABLE_SIZE 1024
+#define TBT_NET_ETHER_ADDR_HASH(addr) (((addr[4] >> 4) | (addr[5] << 4)) % \
+ TBT_NET_MULTICAST_HASH_TABLE_SIZE)
+
+#define BITS_PER_U32 (sizeof(u32) * BITS_PER_BYTE)
+
+#define TBT_NET_NUM_TX_BUFS 256
+#define TBT_NET_NUM_RX_BUFS 256
+#define TBT_NET_SIZE_TOTAL_DESCS ((TBT_NET_NUM_TX_BUFS + TBT_NET_NUM_RX_BUFS) \
+ * sizeof(struct tbt_buf_desc))
+
+
+#define TBT_NUM_FRAMES_PER_PAGE (PAGE_SIZE / TBT_RING_MAX_FRAME_SIZE)
+
+#define TBT_NUM_BUFS_BETWEEN(idx1, idx2, num_bufs) \
+ (((num_bufs) - 1) - \
+ ((((idx1) - (idx2)) + (num_bufs)) & ((num_bufs) - 1)))
+
+#define TX_WAKE_THRESHOLD (2 * DIV_ROUND_UP(TBT_NET_MTU, \
+ TBT_RING_MAX_FRM_DATA_SZ))
+
+#define TBT_NET_DESC_ATTR_SOF_EOF (((PDF_TBT_NET_START_OF_FRAME << \
+ DESC_ATTR_SOF_SHIFT) & \
+ DESC_ATTR_SOF_MASK) | \
+ ((PDF_TBT_NET_END_OF_FRAME << \
+ DESC_ATTR_EOF_SHIFT) & \
+ DESC_ATTR_EOF_MASK))
+
+/* E2E workaround */
+#define TBT_EXIST_BUT_UNUSED_HOPID 2
+
+enum tbt_net_frame_pdf {
+ PDF_TBT_NET_MIDDLE_FRAME,
+ PDF_TBT_NET_START_OF_FRAME,
+ PDF_TBT_NET_END_OF_FRAME,
+};
+
+struct thunderbolt_ip_login {
+ struct thunderbolt_ip_header header;
+ __be32 protocol_revision;
+ __be32 transmit_path;
+ __be32 reserved[4];
+ __be32 crc;
+};
+
+struct thunderbolt_ip_login_response {
+ struct thunderbolt_ip_header header;
+ __be32 status;
+ __be32 receiver_mac_address[2];
+ __be32 receiver_mac_address_length;
+ __be32 reserved[4];
+ __be32 crc;
+};
+
+struct thunderbolt_ip_logout {
+ struct thunderbolt_ip_header header;
+ __be32 crc;
+};
+
+struct thunderbolt_ip_status {
+ struct thunderbolt_ip_header header;
+ __be32 status;
+ __be32 crc;
+};
+
+struct approve_inter_domain_connection_cmd {
+ __be32 req_code;
+ __be32 attributes;
+#define AIDC_ATTR_LINK_SHIFT 16
+#define AIDC_ATTR_LINK_MASK GENMASK(18, AIDC_ATTR_LINK_SHIFT)
+#define AIDC_ATTR_DEPTH_SHIFT 20
+#define AIDC_ATTR_DEPTH_MASK GENMASK(23, AIDC_ATTR_DEPTH_SHIFT)
+ uuid_be remote_uuid;
+ __be16 transmit_ring_number;
+ __be16 transmit_path;
+ __be16 receive_ring_number;
+ __be16 receive_path;
+ __be32 crc;
+
+};
+
+enum neg_event {
+ RECEIVE_LOGOUT = NUM_MEDIUM_STATUSES,
+ RECEIVE_LOGIN_RESPONSE,
+ RECEIVE_LOGIN,
+ NUM_NEG_EVENTS
+};
+
+enum disconnect_path_stage {
+ STAGE_1 = BIT(0),
+ STAGE_2 = BIT(1)
+};
+
+/**
+ * struct tbt_port - the basic tbt_port structure
+ * @tbt_nhi_ctxt: context of the nhi controller.
+ * @net_dev: networking device object.
+ * @login_retry_work: work queue for sending login requests.
+ * @login_response_work: work queue for sending login responses.
+ * @work_struct logout_work: work queue for sending logout requests.
+ * @status_reply_work: work queue for sending logout replies.
+ * @approve_inter_domain_work: work queue for sending interdomain to icm.
+ * @route_str: allows to route the messages to destination.
+ * @interdomain_local_uuid: allows to route the messages from local source.
+ * @interdomain_remote_uuid: allows to route the messages to destination.
+ * @command_id a number that identifies the command.
+ * @negotiation_status: holds the network negotiation state.
+ * @msg_enable: used for debugging filters.
+ * @seq_num: a number that identifies the session.
+ * @login_retry_count: counts number of login retries sent.
+ * @local_depth: depth of the remote peer in the chain.
+ * @transmit_path: routing parameter for the icm.
+ * @frame_id: counting ID of frames.
+ * @num: port number.
+ * @local_path: routing parameter for the icm.
+ * @enable_full_e2e: whether to enable full E2E.
+ * @match_frame_id: whether to match frame id on incoming packets.
+ */
+struct tbt_port {
+ struct tbt_nhi_ctxt *nhi_ctxt;
+ struct net_device *net_dev;
+ struct delayed_work login_retry_work;
+ struct work_struct login_response_work;
+ struct work_struct logout_work;
+ struct work_struct status_reply_work;
+ struct work_struct approve_inter_domain_work;
+ struct route_string route_str;
+ uuid_be interdomain_local_uuid;
+ uuid_be interdomain_remote_uuid;
+ u32 command_id;
+ u16 negotiation_status;
+ u16 msg_enable;
+ u8 seq_num;
+ u8 login_retry_count;
+ u8 local_depth;
+ u8 transmit_path;
+ u16 frame_id;
+ u8 num;
+ u8 local_path;
+ bool enable_full_e2e : 1;
+ bool match_frame_id : 1;
+};
+
+static void disconnect_path(struct tbt_port *port,
+ enum disconnect_path_stage stage)
+{
+ u32 cmd = (DISCONNECT_PORT_A_INTER_DOMAIN_PATH + port->num);
+
+ cmd <<= REG_INMAIL_CMD_CMD_SHIFT;
+ cmd &= REG_INMAIL_CMD_CMD_MASK;
+ cmd |= REG_INMAIL_CMD_REQUEST;
+
+ mutex_lock(&port->nhi_ctxt->mailbox_mutex);
+ if (!mutex_trylock(&port->nhi_ctxt->d0_exit_mailbox_mutex)) {
+ netif_notice(port, link, port->net_dev, "controller id %#x is existing D0\n",
+ port->nhi_ctxt->id);
+ } else {
+ nhi_mailbox(port->nhi_ctxt, cmd, stage, false);
+
+ port->nhi_ctxt->net_devices[port->num].medium_sts =
+ MEDIUM_READY_FOR_CONNECTION;
+
+ mutex_unlock(&port->nhi_ctxt->d0_exit_mailbox_mutex);
+ }
+ mutex_unlock(&port->nhi_ctxt->mailbox_mutex);
+}
+
+static void tbt_net_tear_down(struct net_device *net_dev, bool send_logout)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ void __iomem *iobase = port->nhi_ctxt->iobase;
+ void __iomem *tx_reg = NULL;
+ u32 tx_reg_val = 0;
+
+ netif_carrier_off(net_dev);
+ netif_stop_queue(net_dev);
+
+ if (port->negotiation_status & BIT(MEDIUM_CONNECTED)) {
+ void __iomem *rx_reg = iobase + REG_RX_OPTIONS_BASE +
+ (port->local_path * REG_OPTS_STEP);
+ u32 rx_reg_val = ioread32(rx_reg) & ~REG_OPTS_E2E_EN;
+
+ tx_reg = iobase + REG_TX_OPTIONS_BASE +
+ (port->local_path * REG_OPTS_STEP);
+ tx_reg_val = ioread32(tx_reg) & ~REG_OPTS_E2E_EN;
+
+ disconnect_path(port, STAGE_1);
+
+ /* disable RX flow control */
+ iowrite32(rx_reg_val, rx_reg);
+ /* disable TX flow control */
+ iowrite32(tx_reg_val, tx_reg);
+ /* disable RX ring */
+ iowrite32(rx_reg_val & ~REG_OPTS_VALID, rx_reg);
+
+ rx_reg = iobase + REG_RX_RING_BASE +
+ (port->local_path * REG_RING_STEP);
+ iowrite32(0, rx_reg + REG_RING_PHYS_LO_OFFSET);
+ iowrite32(0, rx_reg + REG_RING_PHYS_HI_OFFSET);
+ }
+
+ /* Stop login messages */
+ cancel_delayed_work_sync(&port->login_retry_work);
+
+ if (send_logout)
+ queue_work(port->nhi_ctxt->net_workqueue, &port->logout_work);
+
+ if (port->negotiation_status & BIT(MEDIUM_CONNECTED)) {
+ unsigned long flags;
+
+ /* wait for TX to finish */
+ usleep_range(5 * USEC_PER_MSEC, 7 * USEC_PER_MSEC);
+ /* disable TX ring */
+ iowrite32(tx_reg_val & ~REG_OPTS_VALID, tx_reg);
+
+ disconnect_path(port, STAGE_2);
+
+ spin_lock_irqsave(&port->nhi_ctxt->lock, flags);
+ /* disable RX and TX interrupts */
+ RING_INT_DISABLE_TX_RX(iobase, port->local_path,
+ port->nhi_ctxt->num_paths);
+ spin_unlock_irqrestore(&port->nhi_ctxt->lock, flags);
+ }
+}
+
+static inline int send_message(struct tbt_port *port, const char *func,
+ enum pdf_value pdf, u32 msg_len,
+ const void *msg)
+{
+ u32 crc_offset = msg_len - sizeof(__be32);
+ __be32 *crc = (__be32 *)((u8 *)msg + crc_offset);
+ bool is_intdom = (pdf == PDF_INTER_DOMAIN_RESPONSE);
+ int res;
+
+ *crc = cpu_to_be32(~__crc32c_le(~0, msg, crc_offset));
+ res = down_timeout(&port->nhi_ctxt->send_sem,
+ msecs_to_jiffies(3 * MSEC_PER_SEC));
+ if (res) {
+ netif_err(port, link, port->net_dev, "%s: controller id %#x timeout on send semaphore\n",
+ func, port->nhi_ctxt->id);
+ return res;
+ }
+
+ if (!mutex_trylock(&port->nhi_ctxt->d0_exit_send_mutex)) {
+ up(&port->nhi_ctxt->send_sem);
+ netif_notice(port, link, port->net_dev, "%s: controller id %#x is existing D0\n",
+ func, port->nhi_ctxt->id);
+ return -ENODEV;
+ }
+
+ res = nhi_send_message(port->nhi_ctxt, pdf, msg_len, msg, is_intdom);
+
+ mutex_unlock(&port->nhi_ctxt->d0_exit_send_mutex);
+ if (res)
+ up(&port->nhi_ctxt->send_sem);
+
+ return res;
+}
+
+static void approve_inter_domain(struct work_struct *work)
+{
+ struct tbt_port *port = container_of(work, typeof(*port),
+ approve_inter_domain_work);
+ struct approve_inter_domain_connection_cmd approve_msg = {
+ .req_code = cpu_to_be32(CC_APPROVE_INTER_DOMAIN_CONNECTION),
+ .transmit_path = cpu_to_be16(LOGIN_TX_PATH),
+ };
+ u32 aidc = (L0_PORT_NUM(port->route_str.lo) << AIDC_ATTR_LINK_SHIFT) &
+ AIDC_ATTR_LINK_MASK;
+
+ aidc |= (port->local_depth << AIDC_ATTR_DEPTH_SHIFT) &
+ AIDC_ATTR_DEPTH_MASK;
+
+ approve_msg.attributes = cpu_to_be32(aidc);
+
+ memcpy(&approve_msg.remote_uuid, &port->interdomain_remote_uuid,
+ sizeof(approve_msg.remote_uuid));
+ approve_msg.transmit_ring_number = cpu_to_be16(port->local_path);
+ approve_msg.receive_ring_number = cpu_to_be16(port->local_path);
+ approve_msg.receive_path = cpu_to_be16(port->transmit_path);
+
+ send_message(port, __func__, PDF_SW_TO_FW_COMMAND, sizeof(approve_msg),
+ &approve_msg);
+}
+
+static inline void prepare_header(struct thunderbolt_ip_header *header,
+ struct tbt_port *port,
+ enum thunderbolt_ip_packet_type packet_type,
+ u8 len_dwords)
+{
+ const uuid_be proto_uuid = APPLE_THUNDERBOLT_IP_PROTOCOL_UUID;
+
+ header->packet_type = cpu_to_be32(packet_type);
+ header->route_str.hi = cpu_to_be32(port->route_str.hi);
+ header->route_str.lo = cpu_to_be32(port->route_str.lo);
+ header->attributes = cpu_to_be32(
+ ((port->seq_num << HDR_ATTR_SEQ_NUM_SHIFT) &
+ HDR_ATTR_SEQ_NUM_MASK) |
+ ((len_dwords << HDR_ATTR_LEN_SHIFT) & HDR_ATTR_LEN_MASK));
+ memcpy(&header->apple_tbt_ip_proto_uuid, &proto_uuid,
+ sizeof(header->apple_tbt_ip_proto_uuid));
+ memcpy(&header->initiator_uuid, &port->interdomain_local_uuid,
+ sizeof(header->initiator_uuid));
+ memcpy(&header->target_uuid, &port->interdomain_remote_uuid,
+ sizeof(header->target_uuid));
+ header->command_id = cpu_to_be32(port->command_id);
+
+ port->command_id++;
+}
+
+static void status_reply(struct work_struct *work)
+{
+ struct tbt_port *port = container_of(work, typeof(*port),
+ status_reply_work);
+ struct thunderbolt_ip_status status_msg = {
+ .status = 0,
+ };
+
+ prepare_header(&status_msg.header, port,
+ THUNDERBOLT_IP_STATUS_TYPE,
+ (offsetof(struct thunderbolt_ip_status, crc) -
+ offsetof(struct thunderbolt_ip_status,
+ header.apple_tbt_ip_proto_uuid)) /
+ sizeof(u32));
+
+ send_message(port, __func__, PDF_INTER_DOMAIN_RESPONSE,
+ sizeof(status_msg), &status_msg);
+
+}
+
+static void logout(struct work_struct *work)
+{
+ struct tbt_port *port = container_of(work, typeof(*port),
+ logout_work);
+ struct thunderbolt_ip_logout logout_msg;
+
+ prepare_header(&logout_msg.header, port,
+ THUNDERBOLT_IP_LOGOUT_TYPE,
+ (offsetof(struct thunderbolt_ip_logout, crc) -
+ offsetof(struct thunderbolt_ip_logout,
+ header.apple_tbt_ip_proto_uuid)) / sizeof(u32));
+
+ send_message(port, __func__, PDF_INTER_DOMAIN_RESPONSE,
+ sizeof(logout_msg), &logout_msg);
+
+}
+
+static void login_response(struct work_struct *work)
+{
+ struct tbt_port *port = container_of(work, typeof(*port),
+ login_response_work);
+ struct thunderbolt_ip_login_response login_res_msg = {
+ .receiver_mac_address_length = cpu_to_be32(ETH_ALEN),
+ };
+
+ prepare_header(&login_res_msg.header, port,
+ THUNDERBOLT_IP_LOGIN_RESPONSE_TYPE,
+ (offsetof(struct thunderbolt_ip_login_response, crc) -
+ offsetof(struct thunderbolt_ip_login_response,
+ header.apple_tbt_ip_proto_uuid)) / sizeof(u32));
+
+ ether_addr_copy((u8 *)login_res_msg.receiver_mac_address,
+ port->net_dev->dev_addr);
+
+ send_message(port, __func__, PDF_INTER_DOMAIN_RESPONSE,
+ sizeof(login_res_msg), &login_res_msg);
+
+}
+
+static void login_retry(struct work_struct *work)
+{
+ struct tbt_port *port = container_of(work, typeof(*port),
+ login_retry_work.work);
+ struct thunderbolt_ip_login login_msg = {
+ .protocol_revision = cpu_to_be32(
+ APPLE_THUNDERBOLT_IP_PROTOCOL_REVISION),
+ .transmit_path = cpu_to_be32(LOGIN_TX_PATH),
+ };
+
+
+ if (port->nhi_ctxt->d0_exit)
+ return;
+
+ port->login_retry_count++;
+
+ prepare_header(&login_msg.header, port,
+ THUNDERBOLT_IP_LOGIN_TYPE,
+ (offsetof(struct thunderbolt_ip_login, crc) -
+ offsetof(struct thunderbolt_ip_login,
+ header.apple_tbt_ip_proto_uuid)) / sizeof(u32));
+
+ if (send_message(port, __func__, PDF_INTER_DOMAIN_RESPONSE,
+ sizeof(login_msg), &login_msg) == -ENODEV)
+ return;
+
+ if (likely(port->login_retry_count < NUM_TX_LOGIN_RETRIES))
+ queue_delayed_work(port->nhi_ctxt->net_workqueue,
+ &port->login_retry_work,
+ msecs_to_jiffies(5 * MSEC_PER_SEC));
+ else
+ netif_notice(port, link, port->net_dev, "port %u (%#x) login timeout after %u retries\n",
+ port->num, port->negotiation_status,
+ port->login_retry_count);
+}
+
+void negotiation_events(struct net_device *net_dev,
+ enum medium_status medium_sts)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ void __iomem *iobase = port->nhi_ctxt->iobase;
+ u32 sof_eof_en, tx_ring_conf, rx_ring_conf, e2e_en;
+ void __iomem *reg;
+ unsigned long flags;
+ u16 hop_id;
+ bool send_logout;
+
+ if (!netif_running(net_dev)) {
+ netif_dbg(port, link, net_dev, "port %u (%#x) is down\n",
+ port->num, port->negotiation_status);
+ return;
+ }
+
+ netif_dbg(port, link, net_dev, "port %u (%#x) receive event %u\n",
+ port->num, port->negotiation_status, medium_sts);
+
+ switch (medium_sts) {
+ case MEDIUM_DISCONNECTED:
+ send_logout = (port->negotiation_status
+ & (BIT(MEDIUM_CONNECTED)
+ | BIT(MEDIUM_READY_FOR_CONNECTION)));
+ send_logout = send_logout && !(port->negotiation_status &
+ BIT(RECEIVE_LOGOUT));
+
+ tbt_net_tear_down(net_dev, send_logout);
+ port->negotiation_status = BIT(MEDIUM_DISCONNECTED);
+ break;
+
+ case MEDIUM_CONNECTED:
+ /*
+ * check if meanwhile other side sent logout
+ * if yes, just don't allow connection to take place
+ * and disconnect path
+ */
+ if (port->negotiation_status & BIT(RECEIVE_LOGOUT)) {
+ disconnect_path(port, STAGE_1 | STAGE_2);
+ break;
+ }
+
+ port->negotiation_status = BIT(MEDIUM_CONNECTED);
+
+ /* configure TX ring */
+ reg = iobase + REG_TX_RING_BASE +
+ (port->local_path * REG_RING_STEP);
+
+ tx_ring_conf = (TBT_NET_NUM_TX_BUFS << REG_RING_SIZE_SHIFT) &
+ REG_RING_SIZE_MASK;
+
+ iowrite32(tx_ring_conf, reg + REG_RING_SIZE_OFFSET);
+
+ /* enable the rings */
+ reg = iobase + REG_TX_OPTIONS_BASE +
+ (port->local_path * REG_OPTS_STEP);
+ if (port->enable_full_e2e) {
+ iowrite32(REG_OPTS_VALID | REG_OPTS_E2E_EN, reg);
+ hop_id = port->local_path;
+ } else {
+ iowrite32(REG_OPTS_VALID, reg);
+ hop_id = TBT_EXIST_BUT_UNUSED_HOPID;
+ }
+
+ reg = iobase + REG_RX_OPTIONS_BASE +
+ (port->local_path * REG_OPTS_STEP);
+
+ sof_eof_en = (BIT(PDF_TBT_NET_START_OF_FRAME) <<
+ REG_RX_OPTS_MASK_SOF_SHIFT) &
+ REG_RX_OPTS_MASK_SOF_MASK;
+
+ sof_eof_en |= (BIT(PDF_TBT_NET_END_OF_FRAME) <<
+ REG_RX_OPTS_MASK_EOF_SHIFT) &
+ REG_RX_OPTS_MASK_EOF_MASK;
+
+ iowrite32(sof_eof_en, reg + REG_RX_OPTS_MASK_OFFSET);
+
+ e2e_en = REG_OPTS_VALID | REG_OPTS_E2E_EN;
+ e2e_en |= (hop_id << REG_RX_OPTS_TX_E2E_HOP_ID_SHIFT) &
+ REG_RX_OPTS_TX_E2E_HOP_ID_MASK;
+
+ iowrite32(e2e_en, reg);
+
+ /*
+ * Configure RX ring
+ * must be after enable ring for E2E to work
+ */
+ reg = iobase + REG_RX_RING_BASE +
+ (port->local_path * REG_RING_STEP);
+
+ rx_ring_conf = (TBT_NET_NUM_RX_BUFS << REG_RING_SIZE_SHIFT) &
+ REG_RING_SIZE_MASK;
+
+ rx_ring_conf |= (TBT_RING_MAX_FRAME_SIZE <<
+ REG_RING_BUF_SIZE_SHIFT) &
+ REG_RING_BUF_SIZE_MASK;
+
+ iowrite32(rx_ring_conf, reg + REG_RING_SIZE_OFFSET);
+
+ spin_lock_irqsave(&port->nhi_ctxt->lock, flags);
+ /* enable RX interrupt */
+ iowrite32(ioread32(iobase + REG_RING_INTERRUPT_BASE) |
+ REG_RING_INT_RX_PROCESSED(port->local_path,
+ port->nhi_ctxt->num_paths),
+ iobase + REG_RING_INTERRUPT_BASE);
+ spin_unlock_irqrestore(&port->nhi_ctxt->lock, flags);
+
+ netif_info(port, link, net_dev, "Thunderbolt(TM) Networking port %u - ready\n",
+ port->num);
+
+ netif_carrier_on(net_dev);
+ netif_start_queue(net_dev);
+ break;
+
+ case MEDIUM_READY_FOR_CONNECTION:
+ /*
+ * If medium is connected, no reason to go back,
+ * keep it 'connected'.
+ * If received login response, don't need to trigger login
+ * retries again.
+ */
+ if (unlikely(port->negotiation_status &
+ (BIT(MEDIUM_CONNECTED) |
+ BIT(RECEIVE_LOGIN_RESPONSE))))
+ break;
+
+ port->negotiation_status = BIT(MEDIUM_READY_FOR_CONNECTION);
+ port->login_retry_count = 0;
+ queue_delayed_work(port->nhi_ctxt->net_workqueue,
+ &port->login_retry_work, 0);
+ break;
+
+ default:
+ break;
+ }
+}
+
+void negotiation_messages(struct net_device *net_dev,
+ struct thunderbolt_ip_header *hdr)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+ __be32 status;
+
+ if (!netif_running(net_dev)) {
+ netif_dbg(port, link, net_dev, "port %u (%#x) is down\n",
+ port->num, port->negotiation_status);
+ return;
+ }
+
+ switch (hdr->packet_type) {
+ case cpu_to_be32(THUNDERBOLT_IP_LOGIN_TYPE):
+ port->transmit_path = be32_to_cpu(
+ ((struct thunderbolt_ip_login *)hdr)->transmit_path);
+ netif_dbg(port, link, net_dev, "port %u (%#x) receive ThunderboltIP login message with transmit path %u\n",
+ port->num, port->negotiation_status,
+ port->transmit_path);
+
+ if (unlikely(port->negotiation_status &
+ BIT(MEDIUM_DISCONNECTED)))
+ break;
+
+ queue_work(port->nhi_ctxt->net_workqueue,
+ &port->login_response_work);
+
+ if (unlikely(port->negotiation_status & BIT(MEDIUM_CONNECTED)))
+ break;
+
+ /*
+ * In case a login response received from other peer
+ * on my login and acked their login for the first time,
+ * so just approve the inter-domain now
+ */
+ if (port->negotiation_status & BIT(RECEIVE_LOGIN_RESPONSE)) {
+ if (!(port->negotiation_status & BIT(RECEIVE_LOGIN)))
+ queue_work(port->nhi_ctxt->net_workqueue,
+ &port->approve_inter_domain_work);
+ /*
+ * if we reached the number of max retries or previous
+ * logout, schedule another round of login retries
+ */
+ } else if ((port->login_retry_count >= NUM_TX_LOGIN_RETRIES) ||
+ (port->negotiation_status & BIT(RECEIVE_LOGOUT))) {
+ port->negotiation_status &= ~(BIT(RECEIVE_LOGOUT));
+ port->login_retry_count = 0;
+ queue_delayed_work(port->nhi_ctxt->net_workqueue,
+ &port->login_retry_work, 0);
+ }
+
+ port->negotiation_status |= BIT(RECEIVE_LOGIN);
+
+ break;
+
+ case cpu_to_be32(THUNDERBOLT_IP_LOGIN_RESPONSE_TYPE):
+ status = ((struct thunderbolt_ip_login_response *)hdr)->status;
+ if (likely(status == 0)) {
+ netif_dbg(port, link, net_dev, "port %u (%#x) receive ThunderboltIP login response message\n",
+ port->num,
+ port->negotiation_status);
+
+ if (unlikely(port->negotiation_status &
+ (BIT(MEDIUM_DISCONNECTED) |
+ BIT(MEDIUM_CONNECTED) |
+ BIT(RECEIVE_LOGIN_RESPONSE))))
+ break;
+
+ port->negotiation_status |=
+ BIT(RECEIVE_LOGIN_RESPONSE);
+ cancel_delayed_work_sync(&port->login_retry_work);
+ /*
+ * login was received from other peer and now response
+ * on our login so approve the inter-domain
+ */
+ if (port->negotiation_status & BIT(RECEIVE_LOGIN))
+ queue_work(port->nhi_ctxt->net_workqueue,
+ &port->approve_inter_domain_work);
+ else
+ port->negotiation_status &=
+ ~BIT(RECEIVE_LOGOUT);
+ } else {
+ netif_notice(port, link, net_dev, "port %u (%#x) receive ThunderboltIP login response message with status %u\n",
+ port->num,
+ port->negotiation_status,
+ be32_to_cpu(status));
+ }
+ break;
+
+ case cpu_to_be32(THUNDERBOLT_IP_LOGOUT_TYPE):
+ netif_dbg(port, link, net_dev, "port %u (%#x) receive ThunderboltIP logout message\n",
+ port->num, port->negotiation_status);
+
+ queue_work(port->nhi_ctxt->net_workqueue,
+ &port->status_reply_work);
+ port->negotiation_status &= ~(BIT(RECEIVE_LOGIN) |
+ BIT(RECEIVE_LOGIN_RESPONSE));
+ port->negotiation_status |= BIT(RECEIVE_LOGOUT);
+
+ if (!(port->negotiation_status & BIT(MEDIUM_CONNECTED))) {
+ tbt_net_tear_down(net_dev, false);
+ break;
+ }
+
+ tbt_net_tear_down(net_dev, true);
+
+ port->negotiation_status |= BIT(MEDIUM_READY_FOR_CONNECTION);
+ port->negotiation_status &= ~(BIT(MEDIUM_CONNECTED));
+ break;
+
+ case cpu_to_be32(THUNDERBOLT_IP_STATUS_TYPE):
+ netif_dbg(port, link, net_dev, "port %u (%#x) receive ThunderboltIP status message with status %u\n",
+ port->num, port->negotiation_status,
+ be32_to_cpu(
+ ((struct thunderbolt_ip_status *)hdr)->status));
+ break;
+ }
+}
+
+void nhi_dealloc_etherdev(struct net_device *net_dev)
+{
+ unregister_netdev(net_dev);
+ free_netdev(net_dev);
+}
+
+void nhi_update_etherdev(struct tbt_nhi_ctxt *nhi_ctxt,
+ struct net_device *net_dev, struct genl_info *info)
+{
+ struct tbt_port *port = netdev_priv(net_dev);
+
+ nla_memcpy(&(port->route_str),
+ info->attrs[NHI_ATTR_LOCAL_ROUTE_STRING],
+ sizeof(port->route_str));
+ nla_memcpy(&port->interdomain_remote_uuid,
+ info->attrs[NHI_ATTR_REMOTE_UUID],
+ sizeof(port->interdomain_remote_uuid));
+ port->local_depth = nla_get_u8(info->attrs[NHI_ATTR_LOCAL_DEPTH]);
+ port->enable_full_e2e = nhi_ctxt->support_full_e2e ?
+ nla_get_flag(info->attrs[NHI_ATTR_ENABLE_FULL_E2E]) : false;
+ port->match_frame_id =
+ nla_get_flag(info->attrs[NHI_ATTR_MATCH_FRAME_ID]);
+ port->frame_id = 0;
+}
+
+struct net_device *nhi_alloc_etherdev(struct tbt_nhi_ctxt *nhi_ctxt,
+ u8 port_num, struct genl_info *info)
+{
+ struct tbt_port *port;
+ struct net_device *net_dev = alloc_etherdev(sizeof(struct tbt_port));
+ u32 hash;
+
+ if (!net_dev)
+ return NULL;
+
+ SET_NETDEV_DEV(net_dev, &nhi_ctxt->pdev->dev);
+
+ port = netdev_priv(net_dev);
+ port->nhi_ctxt = nhi_ctxt;
+ port->net_dev = net_dev;
+ nla_memcpy(&port->interdomain_local_uuid,
+ info->attrs[NHI_ATTR_LOCAL_UUID],
+ sizeof(port->interdomain_local_uuid));
+ nhi_update_etherdev(nhi_ctxt, net_dev, info);
+ port->num = port_num;
+ port->local_path = PATH_FROM_PORT(nhi_ctxt->num_paths, port_num);
+
+ port->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
+
+ net_dev->addr_assign_type = NET_ADDR_PERM;
+ /* unicast and locally administred MAC */
+ net_dev->dev_addr[0] = (port_num << 4) | 0x02;
+ hash = jhash2((u32 *)&port->interdomain_local_uuid,
+ sizeof(port->interdomain_local_uuid)/sizeof(u32), 0);
+
+ memcpy(net_dev->dev_addr + 1, &hash, sizeof(hash));
+ hash = jhash2((u32 *)&port->interdomain_local_uuid,
+ sizeof(port->interdomain_local_uuid)/sizeof(u32), hash);
+
+ net_dev->dev_addr[5] = hash & 0xff;
+
+ scnprintf(net_dev->name, sizeof(net_dev->name), "tbtnet%%dp%hhu",
+ port_num);
+
+ INIT_DELAYED_WORK(&port->login_retry_work, login_retry);
+ INIT_WORK(&port->login_response_work, login_response);
+ INIT_WORK(&port->logout_work, logout);
+ INIT_WORK(&port->status_reply_work, status_reply);
+ INIT_WORK(&port->approve_inter_domain_work, approve_inter_domain);
+
+ netif_info(port, probe, net_dev,
+ "Thunderbolt(TM) Networking port %u - MAC Address: %pM\n",
+ port_num, net_dev->dev_addr);
+
+ return net_dev;
+}
diff --git a/drivers/thunderbolt/icm/net.h b/drivers/thunderbolt/icm/net.h
index 0281201..1cb6701 100644
--- a/drivers/thunderbolt/icm/net.h
+++ b/drivers/thunderbolt/icm/net.h
@@ -23,6 +23,10 @@
#include <linux/semaphore.h>
#include <net/genetlink.h>

+#define APPLE_THUNDERBOLT_IP_PROTOCOL_UUID \
+ UUID_BE(0x9E588F79, 0x478A, 0x1636, \
+ 0x64, 0x56, 0xC6, 0x97, 0xDD, 0xC8, 0x20, 0xA9)
+
/*
* Each physical port contains 2 channels.
* Devices are exposed to user based on physical ports.
@@ -33,6 +37,9 @@
* host channel/link which starts from 1.
*/
#define PORT_NUM_FROM_LINK(link) (((link) - 1) / CHANNELS_PER_PORT_NUM)
+#define PORT_NUM_FROM_MSG(msg) PORT_NUM_FROM_LINK(((msg) & \
+ INTER_DOMAIN_LINK_MASK) >> \
+ INTER_DOMAIN_LINK_SHIFT)

#define TBT_TX_RING_FULL(prod, cons, size) ((((prod) + 1) % (size)) == (cons))
#define TBT_TX_RING_EMPTY(prod, cons) ((prod) == (cons))
@@ -125,6 +132,17 @@ enum {
CC_SET_FW_MODE_FDA_DA_ALL
};

+struct route_string {
+ u32 hi;
+ u32 lo;
+};
+
+struct route_string_be {
+ __be32 hi;
+ __be32 lo;
+};
+
+#define L0_PORT_NUM(cpu_route_str_lo) ((cpu_route_str_lo) & GENMASK(5, 0))

/* NHI genetlink attributes */
enum {
@@ -138,12 +156,53 @@ enum {
NHI_ATTR_PDF,
NHI_ATTR_MSG_TO_ICM,
NHI_ATTR_MSG_FROM_ICM,
+ NHI_ATTR_LOCAL_ROUTE_STRING,
+ NHI_ATTR_LOCAL_UUID,
+ NHI_ATTR_REMOTE_UUID,
+ NHI_ATTR_LOCAL_DEPTH,
+ NHI_ATTR_ENABLE_FULL_E2E,
+ NHI_ATTR_MATCH_FRAME_ID,
__NHI_ATTR_MAX,
};
#define NHI_ATTR_MAX (__NHI_ATTR_MAX - 1)

+/* ThunderboltIP Packet Types */
+enum thunderbolt_ip_packet_type {
+ THUNDERBOLT_IP_LOGIN_TYPE,
+ THUNDERBOLT_IP_LOGIN_RESPONSE_TYPE,
+ THUNDERBOLT_IP_LOGOUT_TYPE,
+ THUNDERBOLT_IP_STATUS_TYPE
+};
+
+struct thunderbolt_ip_header {
+ struct route_string_be route_str;
+ __be32 attributes;
+#define HDR_ATTR_LEN_SHIFT 0
+#define HDR_ATTR_LEN_MASK GENMASK(5, HDR_ATTR_LEN_SHIFT)
+#define HDR_ATTR_SEQ_NUM_SHIFT 27
+#define HDR_ATTR_SEQ_NUM_MASK GENMASK(28, HDR_ATTR_SEQ_NUM_SHIFT)
+ uuid_be apple_tbt_ip_proto_uuid;
+ uuid_be initiator_uuid;
+ uuid_be target_uuid;
+ __be32 packet_type;
+ __be32 command_id;
+};
+
+enum medium_status {
+ /* Handle cable disconnection or peer down */
+ MEDIUM_DISCONNECTED,
+ /* Connection is fully established */
+ MEDIUM_CONNECTED,
+ /* Awaiting for being approved by user-space module */
+ MEDIUM_READY_FOR_APPROVAL,
+ /* Approved by user-space, awaiting for establishment flow to finish */
+ MEDIUM_READY_FOR_CONNECTION,
+ NUM_MEDIUM_STATUSES
+};
+
struct port_net_dev {
struct net_device *net_dev;
+ enum medium_status medium_sts;
struct mutex state_mutex;
};

@@ -213,5 +272,16 @@ struct tbt_nhi_ctxt {
int nhi_send_message(struct tbt_nhi_ctxt *nhi_ctxt, enum pdf_value pdf,
u32 msg_len, const void *msg, bool ignore_icm_resp);
int nhi_mailbox(struct tbt_nhi_ctxt *nhi_ctxt, u32 cmd, u32 data, bool deinit);
+struct net_device *nhi_alloc_etherdev(struct tbt_nhi_ctxt *nhi_ctxt,
+ u8 port_num, struct genl_info *info);
+void nhi_update_etherdev(struct tbt_nhi_ctxt *nhi_ctxt,
+ struct net_device *net_dev, struct genl_info *info);
+void nhi_dealloc_etherdev(struct net_device *net_dev);
+void negotiation_events(struct net_device *net_dev,
+ enum medium_status medium_sts);
+void negotiation_messages(struct net_device *net_dev,
+ struct thunderbolt_ip_header *hdr);
+void tbt_net_rx_msi(struct net_device *net_dev);
+void tbt_net_tx_msi(struct net_device *net_dev);

#endif
--
2.7.4

2016-11-09 14:46:53

by Simon Guinot

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Wed, Nov 09, 2016 at 04:20:00PM +0200, Amir Levy wrote:
> This driver enables Thunderbolt Networking on non-Apple platforms
> running Linux.
>
> Thunderbolt Networking provides peer-to-peer connections to transfer
> files between computers, perform PC migrations, and/or set up small
> workgroups with shared storage.
>
> This is a virtual connection that emulates an Ethernet adapter that
> enables Ethernet networking with the benefit of Thunderbolt superfast
> medium capability.
>
> Thunderbolt Networking enables two hosts and several devices that
> have a Thunderbolt controller to be connected together in a linear
> (Daisy chain) series from a single port.
>
> Thunderbolt Networking for Linux is compatible with Thunderbolt
> Networking on systems running macOS or Windows and also supports
> Thunderbolt generation 2 and 3 controllers.
>
> Note that all pre-existing Thunderbolt generation 3 features, such as
> USB, Display and other Thunderbolt device connectivity will continue
> to function exactly as they did prior to enabling Thunderbolt Networking.
>
> Code and Software Specifications:
> This kernel code creates a virtual ethernet device for computer to
> computer communication over a Thunderbolt cable.
> The new driver is a separate driver to the existing Thunderbolt driver.
> It is designed to work on systems running Linux that
> interface with Intel Connection Manager (ICM) firmware based
> Thunderbolt controllers that support Thunderbolt Networking.
> The kernel code operates in coordination with the Thunderbolt user-
> space daemon to implement full Thunderbolt networking functionality.
>
> Hardware Specifications:
> Thunderbolt Hardware specs have not yet been published but are used
> where necessary for register definitions.

Hi Amir,

I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).

Is the thunderbolt-icm driver supposed to work with this chipset ?

I have installed both a 4.8.6 Linux kernel (patched with your v9
series) and the thunderbolt-software-daemon (27 october release)
inside a Debian system (Jessie).

If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt 2,
device ID 156c), I can see that the thunderbolt-icm driver is loaded and
that the thunderbolt-software-daemon is well started. But the Ethernet
interface is not created.

I have attached to this email the syslog file. There is the logs from
both the kernel and the daemon inside. Note that the daemon logs are
everything but clear about what could be the issue. Maybe I missed some
kind of configuration ? But I failed to find any valuable information
about configuring the driver and/or the daemon in the various
documentation files.

Please, can you provide some guidance ? I'd really like to test your
patch series.

Thanks in advance.

Simon


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2016-11-09 15:43:02

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> On Wed, Nov 09, 2016 at 04:20:00PM +0200, Amir Levy wrote:
> > This driver enables Thunderbolt Networking on non-Apple platforms
> > running Linux.
> >
> > Thunderbolt Networking provides peer-to-peer connections to transfer
> > files between computers, perform PC migrations, and/or set up small
> > workgroups with shared storage.
> >
> > This is a virtual connection that emulates an Ethernet adapter that
> > enables Ethernet networking with the benefit of Thunderbolt
> > superfast medium capability.
> >
> > Thunderbolt Networking enables two hosts and several devices that
> > have a Thunderbolt controller to be connected together in a linear
> > (Daisy
> > chain) series from a single port.
> >
> > Thunderbolt Networking for Linux is compatible with Thunderbolt
> > Networking on systems running macOS or Windows and also supports
> > Thunderbolt generation 2 and 3 controllers.
> >
> > Note that all pre-existing Thunderbolt generation 3 features, such
> > as USB, Display and other Thunderbolt device connectivity will
> > continue to function exactly as they did prior to enabling Thunderbolt Networking.
> >
> > Code and Software Specifications:
> > This kernel code creates a virtual ethernet device for computer to
> > computer communication over a Thunderbolt cable.
> > The new driver is a separate driver to the existing Thunderbolt driver.
> > It is designed to work on systems running Linux that interface with
> > Intel Connection Manager (ICM) firmware based Thunderbolt
> > controllers that support Thunderbolt Networking.
> > The kernel code operates in coordination with the Thunderbolt user-
> > space daemon to implement full Thunderbolt networking functionality.
> >
> > Hardware Specifications:
> > Thunderbolt Hardware specs have not yet been published but are used
> > where necessary for register definitions.
>
> Hi Amir,
>
> I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
> Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
>
> Is the thunderbolt-icm driver supposed to work with this chipset ?
>

Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
156d is the bridge - http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619

> I have installed both a 4.8.6 Linux kernel (patched with your v9
> series) and the thunderbolt-software-daemon (27 october release)
> inside a Debian system (Jessie).
>
> If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt 2,
> device ID 156c), I can see that the thunderbolt-icm driver is loaded
> and that the thunderbolt-software-daemon is well started. But the
> Ethernet interface is not created.
>
> I have attached to this email the syslog file. There is the logs from
> both the kernel and the daemon inside. Note that the daemon logs are
> everything but clear about what could be the issue. Maybe I missed
> some kind of configuration ? But I failed to find any valuable
> information about configuring the driver and/or the daemon in the various documentation files.
>
> Please, can you provide some guidance ? I'd really like to test your
> patch series.

First, thank you very much for willing to test it.
Thunderbolt Networking support was added during Falcon Ridge, in the latest FR images.
Do you know which Thunderbolt image version you have on your system?
Currently I submitted only Thunderbolt Networking feature in Linux, and we plan to add
more features like reading the image version and updating the image.
If you don't know the image version, the only thing I can suggest is to load windows, install thunderbolt SW
and check in the Thunderbolt application the image version.
To know if image update is needed, you can check - https://thunderbolttechnology.net/updates

>
> Thanks in advance.
>
> Simon

Thanks,
Amir

2016-11-10 11:32:43

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 7/8] thunderbolt: Networking doc

On Wed, Nov 09, 2016 at 04:20:07PM +0200, Amir Levy wrote:
> Adding Thunderbolt(TM) networking documentation.
>
> Signed-off-by: Amir Levy <[email protected]>
> ---
> Documentation/00-INDEX | 2 +
> Documentation/thunderbolt/networking.txt | 132 +++++++++++++++++++++++++++++++

Note, new files should be in .rst format, and live in the new
subdirectory for them (somewhere in Documentation, don't know off the
top of my head...)

> 2 files changed, 134 insertions(+)
> create mode 100644 Documentation/thunderbolt/networking.txt
>
> diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
> index 3acc4f1..0239e68 100644
> --- a/Documentation/00-INDEX
> +++ b/Documentation/00-INDEX
> @@ -440,6 +440,8 @@ this_cpu_ops.txt
> - List rationale behind and the way to use this_cpu operations.
> thermal/
> - directory with information on managing thermal issues (CPU/temp)
> +thunderbolt/
> + - directory with info regarding Thunderbolt.
> trace/
> - directory with info on tracing technologies within linux
> unaligned-memory-access.txt

This change is probably not needed.

> diff --git a/Documentation/thunderbolt/networking.txt b/Documentation/thunderbolt/networking.txt
> new file mode 100644
> index 0000000..88d1c12
> --- /dev/null
> +++ b/Documentation/thunderbolt/networking.txt
> @@ -0,0 +1,132 @@
> +Intel Thunderbolt(TM) Networking driver
> +=======================================
> +
> +Copyright(c) 2013 - 2016 Intel Corporation.
> +
> +Contact Information:
> +Intel Thunderbolt mailing list <[email protected]>
> +Edited by Amir Levy <[email protected]>
> +
> +Overview
> +========
> +
> +* The Thunderbolt Networking driver enables peer to peer networking on non-Apple
> + platforms running Linux.
> +
> +* The driver creates a virtual Ethernet device that enables computer to computer
> + communication over the Thunderbolt cable.
> +
> +* Using Thunderbolt Networking you can perform high speed file transfers between
> + computers, perform PC migrations and/or set up small workgroups with shared
> + storage without compromising any other Thunderbolt functionality.
> +
> +* The driver is located in drivers/thunderbolt/icm.
> +
> +* This driver will function only on non-Apple platforms with firmware based
> + Thunderbolt controllers that support Thunderbolt Networking.
> +
> + +----------------+ +----------------+
> + |Host 1 | |Host 2 |
> + | | | |
> + | +-------+ | | +-------+ |
> + | |Network| | | |Network| |
> + | |Stack | | | |Stack | |
> + | +-------+ | | +-------+ |
> + | ^ | | ^ |
> + | | | | | |
> + | v | | v |
> + | +-----------+ | | +-----------+ |
> + | |Thunderbolt| | | |Thunderbolt| |
> + | |Networking | | | |Networking | |
> + | |Driver | | | |Driver | |
> + | +-----------+ | | +-----------+ |
> + | ^ | | ^ |
> + | | | | | |
> + | v | | v |
> + | +-----------+ | | +-----------+ |
> + | |Thunderbolt| | | |Thunderbolt| |
> + | |Controller |<-+------------+->|Controller | |
> + | |with ICM | | | |with ICM | |
> + | |enabled | | | |enabled | |
> + | +-----------+ | | +-----------+ |
> + +----------------+ +----------------+
> +
> +Files
> +=====
> +
> +The following files are located in the drivers/thunderbolt/icm directory:
> +
> +- icm_nhi.c/h: These files allow communication with the firmware (Intel
> + Connection Manager) based controller. They also create an interface for
> + netlink communication with a user space daemon.
> +
> +- net.c/net.h: These files implement the 'eth' interface for the
> + Thunderbolt(TM) Networking.

You don't have to list the files, right?

> +
> +Interface to User Space
> +=======================
> +
> +The interface to the user space module is implemented through a Generic Netlink.

Huh? Not a normal network device?

> +This is the communications protocol between the Thunderbolt driver and the user
> +space application.

What userspace application?

> +Note that this interface mediates user space communication with ICM.

What is ICM?

> +(Existing Linux tools can be used to configure the network interface.)

Why aren't they sufficient for everything here?

> +
> +The Thunderbolt Daemon utilizes this interface to communicate with the driver.

What "Thunderbolt Daemon"? What is "this"?

> +To be accessed by the user space module, both kernel and user space modules
> +have to register with the same GENL_NAME.

What userspace modules?

How do you set GENL_NAME? What is that?

> +For the purpose of the Thunderbolt Network driver, "thunderbolt" is used.

What do you mean?

> +The registration is done at driver initialization time for all instances
> +of the Thunderbolt controllers.

Who does this?

> The communication is carried through pre-defined
> +Thunderbolt messages. Each specific message has a callback function that is
> +called when the related message is received.

Is this the internal structure of the driver? If so, why not just put
it all in the code itself and build the documentation from it?

> +
> +Message Definitions:
> +* NHI_CMD_UNSPEC: Not used.
> +* NHI_CMD_SUBSCRIBE: Subscription request from daemon to driver to open the
> + communication channel.
> +* NHI_CMD_UNSUBSCRIBE: Request from daemon to driver to unsubscribe and
> + to close communication channel.
> +* NHI_CMD_QUERY_INFORMATION: Request information from the driver such as
> + driver version, FW version offset, number of ports in the controller
> + and DMA port.
> +* NHI_CMD_MSG_TO_ICM: Message from user space module to FW.
> +* NHI_CMD_MSG_FROM_ICM: Response from FW to user space module.
> +* NHI_CMD_MAILBOX: Message that uses mailbox mechanism such as FW policy
> + changes or disconnect path.
> +* NHI_CMD_APPROVE_TBT_NETWORKING: Request from user space module to FW to
> + establish path.
> +* NHI_CMD_ICM_IN_SAFE_MODE: Indication that the FW has entered safe mode.
> +
> +Communication with Intel Connection Manager(ICM) Firmware
> +=========================================================
> +
> +There are several circular buffers in Thunderbolt each using Direct Memory
> +Access (DMA).

Again, internal documentation?

Isn't this just a "normal" network device? Why document any of this in
a separate way? What can a user do with this? Who is the audience of
this file?

still confused,

greg k-h

2016-11-10 11:32:41

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Wed, Nov 09, 2016 at 04:20:00PM +0200, Amir Levy wrote:
> This driver enables Thunderbolt Networking on non-Apple platforms
> running Linux.
>
> Thunderbolt Networking provides peer-to-peer connections to transfer
> files between computers, perform PC migrations, and/or set up small
> workgroups with shared storage.
>
> This is a virtual connection that emulates an Ethernet adapter that
> enables Ethernet networking with the benefit of Thunderbolt superfast
> medium capability.
>
> Thunderbolt Networking enables two hosts and several devices that
> have a Thunderbolt controller to be connected together in a linear
> (Daisy chain) series from a single port.
>
> Thunderbolt Networking for Linux is compatible with Thunderbolt
> Networking on systems running macOS or Windows and also supports
> Thunderbolt generation 2 and 3 controllers.
>
> Note that all pre-existing Thunderbolt generation 3 features, such as
> USB, Display and other Thunderbolt device connectivity will continue
> to function exactly as they did prior to enabling Thunderbolt Networking.
>
> Code and Software Specifications:
> This kernel code creates a virtual ethernet device for computer to
> computer communication over a Thunderbolt cable.
> The new driver is a separate driver to the existing Thunderbolt driver.
> It is designed to work on systems running Linux that
> interface with Intel Connection Manager (ICM) firmware based
> Thunderbolt controllers that support Thunderbolt Networking.
> The kernel code operates in coordination with the Thunderbolt user-
> space daemon to implement full Thunderbolt networking functionality.
>
> Hardware Specifications:
> Thunderbolt Hardware specs have not yet been published but are used
> where necessary for register definitions.
>
> Acked-by: Andreas Noever <[email protected]>
> Tested-by: Mario Limonciello <[email protected]>

This whole series is acked and tested by these people? If so, why did
you not include that in each patch?

And how about getting some internal-Intel kernel developers to review
and sign-off on this code? Don't make the community do the review when
you have access to resources like this. You have an internal mailing
list for this very purpose, use it!

thanks,

greg k-h

2016-11-10 11:39:27

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Wed, Nov 9 2016, 06:02 PM, Greg KH wrote:
> On Wed, Nov 09, 2016 at 04:20:00PM +0200, Amir Levy wrote:
> > This driver enables Thunderbolt Networking on non-Apple platforms
> > running Linux.
> >
> > Thunderbolt Networking provides peer-to-peer connections to transfer
> > files between computers, perform PC migrations, and/or set up small
> > workgroups with shared storage.
> >
> > This is a virtual connection that emulates an Ethernet adapter that
> > enables Ethernet networking with the benefit of Thunderbolt superfast
> > medium capability.
> >
> > Thunderbolt Networking enables two hosts and several devices that have
> > a Thunderbolt controller to be connected together in a linear (Daisy
> > chain) series from a single port.
> >
> > Thunderbolt Networking for Linux is compatible with Thunderbolt
> > Networking on systems running macOS or Windows and also supports
> > Thunderbolt generation 2 and 3 controllers.
> >
> > Note that all pre-existing Thunderbolt generation 3 features, such as
> > USB, Display and other Thunderbolt device connectivity will continue
> > to function exactly as they did prior to enabling Thunderbolt Networking.
> >
> > Code and Software Specifications:
> > This kernel code creates a virtual ethernet device for computer to
> > computer communication over a Thunderbolt cable.
> > The new driver is a separate driver to the existing Thunderbolt driver.
> > It is designed to work on systems running Linux that interface with
> > Intel Connection Manager (ICM) firmware based Thunderbolt controllers
> > that support Thunderbolt Networking.
> > The kernel code operates in coordination with the Thunderbolt user-
> > space daemon to implement full Thunderbolt networking functionality.
> >
> > Hardware Specifications:
> > Thunderbolt Hardware specs have not yet been published but are used
> > where necessary for register definitions.
> >
> > Acked-by: Andreas Noever <[email protected]>
> > Tested-by: Mario Limonciello <[email protected]>
>
> This whole series is acked and tested by these people? If so, why did you not
> include that in each patch?
>

Will add in next patch set.

> And how about getting some internal-Intel kernel developers to review and
> sign-off on this code? Don't make the community do the review when you
> have access to resources like this. You have an internal mailing list for this
> very purpose, use it!
>

The review with the internal-Intel kernel developers was done before submitting
the first patch set.
Version 9 that we have here isn't so different from Version 0.

> thanks,
>
> greg k-h

2016-11-10 11:44:05

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Thu, Nov 10, 2016 at 11:39:19AM +0000, Levy, Amir (Jer) wrote:
> > And how about getting some internal-Intel kernel developers to review and
> > sign-off on this code? Don't make the community do the review when you
> > have access to resources like this. You have an internal mailing list for this
> > very purpose, use it!
> >
>
> The review with the internal-Intel kernel developers was done before submitting
> the first patch set.

Then why is their signed-off-by:s not on the patchset showing that they
"bless" this series?

thanks,

greg k-h

2016-11-10 11:48:05

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 7/8] thunderbolt: Networking doc

On Wed, Nov 9 2016, 06:00 PM, Greg KH wrote:
> On Wed, Nov 09, 2016 at 04:20:07PM +0200, Amir Levy wrote:
> > Adding Thunderbolt(TM) networking documentation.
> >
> > Signed-off-by: Amir Levy <[email protected]>
> > ---
> > Documentation/00-INDEX | 2 +
> > Documentation/thunderbolt/networking.txt | 132
> > +++++++++++++++++++++++++++++++
>
> Note, new files should be in .rst format, and live in the new subdirectory for
> them (somewhere in Documentation, don't know off the top of my head...)
>
> > 2 files changed, 134 insertions(+)
> > create mode 100644 Documentation/thunderbolt/networking.txt
> >
> > diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX index
> > 3acc4f1..0239e68 100644
> > --- a/Documentation/00-INDEX
> > +++ b/Documentation/00-INDEX
> > @@ -440,6 +440,8 @@ this_cpu_ops.txt
> > - List rationale behind and the way to use this_cpu operations.
> > thermal/
> > - directory with information on managing thermal issues (CPU/temp)
> > +thunderbolt/
> > + - directory with info regarding Thunderbolt.
> > trace/
> > - directory with info on tracing technologies within linux
> > unaligned-memory-access.txt
>
> This change is probably not needed.
>
> > diff --git a/Documentation/thunderbolt/networking.txt
> > b/Documentation/thunderbolt/networking.txt
> > new file mode 100644
> > index 0000000..88d1c12
> > --- /dev/null
> > +++ b/Documentation/thunderbolt/networking.txt
> > @@ -0,0 +1,132 @@
> > +Intel Thunderbolt(TM) Networking driver
> > +=======================================
> > +
> > +Copyright(c) 2013 - 2016 Intel Corporation.
> > +
> > +Contact Information:
> > +Intel Thunderbolt mailing list <[email protected]>
> > +Edited by Amir Levy <[email protected]>
> > +
> > +Overview
> > +========
> > +
> > +* The Thunderbolt Networking driver enables peer to peer networking
> > +on non-Apple
> > + platforms running Linux.
> > +
> > +* The driver creates a virtual Ethernet device that enables computer
> > +to computer
> > + communication over the Thunderbolt cable.
> > +
> > +* Using Thunderbolt Networking you can perform high speed file
> > +transfers between
> > + computers, perform PC migrations and/or set up small workgroups
> > +with shared
> > + storage without compromising any other Thunderbolt functionality.
> > +
> > +* The driver is located in drivers/thunderbolt/icm.
> > +
> > +* This driver will function only on non-Apple platforms with firmware
> > +based
> > + Thunderbolt controllers that support Thunderbolt Networking.
> > +
> > + +----------------+ +----------------+
> > + |Host 1 | |Host 2 |
> > + | | | |
> > + | +-------+ | | +-------+ |
> > + | |Network| | | |Network| |
> > + | |Stack | | | |Stack | |
> > + | +-------+ | | +-------+ |
> > + | ^ | | ^ |
> > + | | | | | |
> > + | v | | v |
> > + | +-----------+ | | +-----------+ |
> > + | |Thunderbolt| | | |Thunderbolt| |
> > + | |Networking | | | |Networking | |
> > + | |Driver | | | |Driver | |
> > + | +-----------+ | | +-----------+ |
> > + | ^ | | ^ |
> > + | | | | | |
> > + | v | | v |
> > + | +-----------+ | | +-----------+ |
> > + | |Thunderbolt| | | |Thunderbolt| |
> > + | |Controller |<-+------------+->|Controller | |
> > + | |with ICM | | | |with ICM | |
> > + | |enabled | | | |enabled | |
> > + | +-----------+ | | +-----------+ |
> > + +----------------+ +----------------+
> > +
> > +Files
> > +=====
> > +
> > +The following files are located in the drivers/thunderbolt/icm directory:
> > +
> > +- icm_nhi.c/h: These files allow communication with the firmware
> (Intel
> > + Connection Manager) based controller. They also create an interface
> > +for
> > + netlink communication with a user space daemon.
> > +
> > +- net.c/net.h: These files implement the 'eth' interface for the
> > + Thunderbolt(TM) Networking.
>
> You don't have to list the files, right?
>
> > +
> > +Interface to User Space
> > +=======================
> > +
> > +The interface to the user space module is implemented through a Generic
> Netlink.
>
> Huh? Not a normal network device?
>
> > +This is the communications protocol between the Thunderbolt driver
> > +and the user space application.
>
> What userspace application?
>
> > +Note that this interface mediates user space communication with ICM.
>
> What is ICM?
>
> > +(Existing Linux tools can be used to configure the network
> > +interface.)
>
> Why aren't they sufficient for everything here?
>
> > +
> > +The Thunderbolt Daemon utilizes this interface to communicate with the
> driver.
>
> What "Thunderbolt Daemon"? What is "this"?
>
> > +To be accessed by the user space module, both kernel and user space
> > +modules have to register with the same GENL_NAME.
>
> What userspace modules?
>
> How do you set GENL_NAME? What is that?
>
> > +For the purpose of the Thunderbolt Network driver, "thunderbolt" is
> used.
>
> What do you mean?
>
> > +The registration is done at driver initialization time for all
> > +instances of the Thunderbolt controllers.
>
> Who does this?
>
> > The communication is carried through pre-defined
> > +Thunderbolt messages. Each specific message has a callback function
> > +that is called when the related message is received.
>
> Is this the internal structure of the driver? If so, why not just put it all in the
> code itself and build the documentation from it?
>
> > +
> > +Message Definitions:
> > +* NHI_CMD_UNSPEC: Not used.
> > +* NHI_CMD_SUBSCRIBE: Subscription request from daemon to driver to
> > +open the
> > + communication channel.
> > +* NHI_CMD_UNSUBSCRIBE: Request from daemon to driver to
> unsubscribe
> > +and
> > + to close communication channel.
> > +* NHI_CMD_QUERY_INFORMATION: Request information from the driver
> such
> > +as
> > + driver version, FW version offset, number of ports in the
> > +controller
> > + and DMA port.
> > +* NHI_CMD_MSG_TO_ICM: Message from user space module to FW.
> > +* NHI_CMD_MSG_FROM_ICM: Response from FW to user space module.
> > +* NHI_CMD_MAILBOX: Message that uses mailbox mechanism such as
> FW
> > +policy
> > + changes or disconnect path.
> > +* NHI_CMD_APPROVE_TBT_NETWORKING: Request from user space
> module to
> > +FW to
> > + establish path.
> > +* NHI_CMD_ICM_IN_SAFE_MODE: Indication that the FW has entered
> safe mode.
> > +
> > +Communication with Intel Connection Manager(ICM) Firmware
> >
> +=========================================================
> > +
> > +There are several circular buffers in Thunderbolt each using Direct
> > +Memory Access (DMA).
>
> Again, internal documentation?
>
> Isn't this just a "normal" network device? Why document any of this in a
> separate way? What can a user do with this? Who is the audience of this
> file?
>
> still confused,
>
> greg k-h

This document was one of the suggestions we got from internal-Intel kernel developers.
If you think it isn't needed, I'll remove it from next patch set.

2016-11-10 11:48:55

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Thu, Nov 10 2016, 01:44 PM, Greg KH wrote:
> On Thu, Nov 10, 2016 at 11:39:19AM +0000, Levy, Amir (Jer) wrote:
> > > And how about getting some internal-Intel kernel developers to
> > > review and sign-off on this code? Don't make the community do the
> > > review when you have access to resources like this. You have an
> > > internal mailing list for this very purpose, use it!
> > >
> >
> > The review with the internal-Intel kernel developers was done before
> > submitting the first patch set.
>
> Then why is their signed-off-by:s not on the patchset showing that they
> "bless" this series?
>

Working on it.

> thanks,
>
> greg k-h

2016-11-10 11:53:14

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 7/8] thunderbolt: Networking doc

On Thu, Nov 10, 2016 at 11:47:57AM +0000, Levy, Amir (Jer) wrote:
> On Wed, Nov 9 2016, 06:00 PM, Greg KH wrote:
> > On Wed, Nov 09, 2016 at 04:20:07PM +0200, Amir Levy wrote:
> > > Adding Thunderbolt(TM) networking documentation.
> > >
> > > Signed-off-by: Amir Levy <[email protected]>
> > > ---
> > > Documentation/00-INDEX | 2 +
> > > Documentation/thunderbolt/networking.txt | 132
> > > +++++++++++++++++++++++++++++++
> >
> > Note, new files should be in .rst format, and live in the new subdirectory for
> > them (somewhere in Documentation, don't know off the top of my head...)
> >
> > > 2 files changed, 134 insertions(+)
> > > create mode 100644 Documentation/thunderbolt/networking.txt
> > >
> > > diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX index
> > > 3acc4f1..0239e68 100644
> > > --- a/Documentation/00-INDEX
> > > +++ b/Documentation/00-INDEX
> > > @@ -440,6 +440,8 @@ this_cpu_ops.txt
> > > - List rationale behind and the way to use this_cpu operations.
> > > thermal/
> > > - directory with information on managing thermal issues (CPU/temp)
> > > +thunderbolt/
> > > + - directory with info regarding Thunderbolt.
> > > trace/
> > > - directory with info on tracing technologies within linux
> > > unaligned-memory-access.txt
> >
> > This change is probably not needed.
> >
> > > diff --git a/Documentation/thunderbolt/networking.txt
> > > b/Documentation/thunderbolt/networking.txt
> > > new file mode 100644
> > > index 0000000..88d1c12
> > > --- /dev/null
> > > +++ b/Documentation/thunderbolt/networking.txt
> > > @@ -0,0 +1,132 @@
> > > +Intel Thunderbolt(TM) Networking driver
> > > +=======================================
> > > +
> > > +Copyright(c) 2013 - 2016 Intel Corporation.
> > > +
> > > +Contact Information:
> > > +Intel Thunderbolt mailing list <[email protected]>
> > > +Edited by Amir Levy <[email protected]>
> > > +
> > > +Overview
> > > +========
> > > +
> > > +* The Thunderbolt Networking driver enables peer to peer networking
> > > +on non-Apple
> > > + platforms running Linux.
> > > +
> > > +* The driver creates a virtual Ethernet device that enables computer
> > > +to computer
> > > + communication over the Thunderbolt cable.
> > > +
> > > +* Using Thunderbolt Networking you can perform high speed file
> > > +transfers between
> > > + computers, perform PC migrations and/or set up small workgroups
> > > +with shared
> > > + storage without compromising any other Thunderbolt functionality.
> > > +
> > > +* The driver is located in drivers/thunderbolt/icm.
> > > +
> > > +* This driver will function only on non-Apple platforms with firmware
> > > +based
> > > + Thunderbolt controllers that support Thunderbolt Networking.
> > > +
> > > + +----------------+ +----------------+
> > > + |Host 1 | |Host 2 |
> > > + | | | |
> > > + | +-------+ | | +-------+ |
> > > + | |Network| | | |Network| |
> > > + | |Stack | | | |Stack | |
> > > + | +-------+ | | +-------+ |
> > > + | ^ | | ^ |
> > > + | | | | | |
> > > + | v | | v |
> > > + | +-----------+ | | +-----------+ |
> > > + | |Thunderbolt| | | |Thunderbolt| |
> > > + | |Networking | | | |Networking | |
> > > + | |Driver | | | |Driver | |
> > > + | +-----------+ | | +-----------+ |
> > > + | ^ | | ^ |
> > > + | | | | | |
> > > + | v | | v |
> > > + | +-----------+ | | +-----------+ |
> > > + | |Thunderbolt| | | |Thunderbolt| |
> > > + | |Controller |<-+------------+->|Controller | |
> > > + | |with ICM | | | |with ICM | |
> > > + | |enabled | | | |enabled | |
> > > + | +-----------+ | | +-----------+ |
> > > + +----------------+ +----------------+
> > > +
> > > +Files
> > > +=====
> > > +
> > > +The following files are located in the drivers/thunderbolt/icm directory:
> > > +
> > > +- icm_nhi.c/h: These files allow communication with the firmware
> > (Intel
> > > + Connection Manager) based controller. They also create an interface
> > > +for
> > > + netlink communication with a user space daemon.
> > > +
> > > +- net.c/net.h: These files implement the 'eth' interface for the
> > > + Thunderbolt(TM) Networking.
> >
> > You don't have to list the files, right?
> >
> > > +
> > > +Interface to User Space
> > > +=======================
> > > +
> > > +The interface to the user space module is implemented through a Generic
> > Netlink.
> >
> > Huh? Not a normal network device?
> >
> > > +This is the communications protocol between the Thunderbolt driver
> > > +and the user space application.
> >
> > What userspace application?
> >
> > > +Note that this interface mediates user space communication with ICM.
> >
> > What is ICM?
> >
> > > +(Existing Linux tools can be used to configure the network
> > > +interface.)
> >
> > Why aren't they sufficient for everything here?
> >
> > > +
> > > +The Thunderbolt Daemon utilizes this interface to communicate with the
> > driver.
> >
> > What "Thunderbolt Daemon"? What is "this"?
> >
> > > +To be accessed by the user space module, both kernel and user space
> > > +modules have to register with the same GENL_NAME.
> >
> > What userspace modules?
> >
> > How do you set GENL_NAME? What is that?
> >
> > > +For the purpose of the Thunderbolt Network driver, "thunderbolt" is
> > used.
> >
> > What do you mean?
> >
> > > +The registration is done at driver initialization time for all
> > > +instances of the Thunderbolt controllers.
> >
> > Who does this?
> >
> > > The communication is carried through pre-defined
> > > +Thunderbolt messages. Each specific message has a callback function
> > > +that is called when the related message is received.
> >
> > Is this the internal structure of the driver? If so, why not just put it all in the
> > code itself and build the documentation from it?
> >
> > > +
> > > +Message Definitions:
> > > +* NHI_CMD_UNSPEC: Not used.
> > > +* NHI_CMD_SUBSCRIBE: Subscription request from daemon to driver to
> > > +open the
> > > + communication channel.
> > > +* NHI_CMD_UNSUBSCRIBE: Request from daemon to driver to
> > unsubscribe
> > > +and
> > > + to close communication channel.
> > > +* NHI_CMD_QUERY_INFORMATION: Request information from the driver
> > such
> > > +as
> > > + driver version, FW version offset, number of ports in the
> > > +controller
> > > + and DMA port.
> > > +* NHI_CMD_MSG_TO_ICM: Message from user space module to FW.
> > > +* NHI_CMD_MSG_FROM_ICM: Response from FW to user space module.
> > > +* NHI_CMD_MAILBOX: Message that uses mailbox mechanism such as
> > FW
> > > +policy
> > > + changes or disconnect path.
> > > +* NHI_CMD_APPROVE_TBT_NETWORKING: Request from user space
> > module to
> > > +FW to
> > > + establish path.
> > > +* NHI_CMD_ICM_IN_SAFE_MODE: Indication that the FW has entered
> > safe mode.
> > > +
> > > +Communication with Intel Connection Manager(ICM) Firmware
> > >
> > +=========================================================
> > > +
> > > +There are several circular buffers in Thunderbolt each using Direct
> > > +Memory Access (DMA).
> >
> > Again, internal documentation?
> >
> > Isn't this just a "normal" network device? Why document any of this in a
> > separate way? What can a user do with this? Who is the audience of this
> > file?
> >
> > still confused,
> >
> > greg k-h
>
> This document was one of the suggestions we got from internal-Intel kernel developers.
> If you think it isn't needed, I'll remove it from next patch set.

I'm not saying it is not needed, I'm saying that if you want it, it
needs to actually be useful :)

As it is, look at the questions I asked above, I really don't understand
this document. And if I'm not the target audience for this, then great,
who is?

thanks,

greg k-h

2016-11-10 14:24:41

by Jonathan Corbet

[permalink] [raw]
Subject: Re: [PATCH v9 7/8] thunderbolt: Networking doc

On Wed, 9 Nov 2016 17:00:02 +0100
Greg KH <[email protected]> wrote:

> > Documentation/00-INDEX | 2 +
> > Documentation/thunderbolt/networking.txt | 132 +++++++++++++++++++++++++++++++
>
> Note, new files should be in .rst format, and live in the new
> subdirectory for them (somewhere in Documentation, don't know off the
> top of my head...)

This one's almost in RST already, happily.

We haven't really figured out a hierarchy for device-specific docs like
this yet; I should get on that, I guess.

I do believe that we should separate documents for end users from those
aimed at kernel developers; those are two very different audiences
looking for different kinds of information.

Thanks,

jon

2016-11-15 10:59:30

by Simon Guinot

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Wed, Nov 09, 2016 at 03:42:53PM +0000, Levy, Amir (Jer) wrote:
> On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> > On Wed, Nov 09, 2016 at 04:20:00PM +0200, Amir Levy wrote:
> > > This driver enables Thunderbolt Networking on non-Apple platforms
> > > running Linux.
> > >
> > > Thunderbolt Networking provides peer-to-peer connections to transfer
> > > files between computers, perform PC migrations, and/or set up small
> > > workgroups with shared storage.
> > >
> > > This is a virtual connection that emulates an Ethernet adapter that
> > > enables Ethernet networking with the benefit of Thunderbolt
> > > superfast medium capability.
> > >
> > > Thunderbolt Networking enables two hosts and several devices that
> > > have a Thunderbolt controller to be connected together in a linear
> > > (Daisy
> > > chain) series from a single port.
> > >
> > > Thunderbolt Networking for Linux is compatible with Thunderbolt
> > > Networking on systems running macOS or Windows and also supports
> > > Thunderbolt generation 2 and 3 controllers.
> > >
> > > Note that all pre-existing Thunderbolt generation 3 features, such
> > > as USB, Display and other Thunderbolt device connectivity will
> > > continue to function exactly as they did prior to enabling Thunderbolt Networking.
> > >
> > > Code and Software Specifications:
> > > This kernel code creates a virtual ethernet device for computer to
> > > computer communication over a Thunderbolt cable.
> > > The new driver is a separate driver to the existing Thunderbolt driver.
> > > It is designed to work on systems running Linux that interface with
> > > Intel Connection Manager (ICM) firmware based Thunderbolt
> > > controllers that support Thunderbolt Networking.
> > > The kernel code operates in coordination with the Thunderbolt user-
> > > space daemon to implement full Thunderbolt networking functionality.
> > >
> > > Hardware Specifications:
> > > Thunderbolt Hardware specs have not yet been published but are used
> > > where necessary for register definitions.
> >
> > Hi Amir,
> >
> > I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
> > Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
> >
> > Is the thunderbolt-icm driver supposed to work with this chipset ?
> >
>
> Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
> 156d is the bridge - http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619
>
> > I have installed both a 4.8.6 Linux kernel (patched with your v9
> > series) and the thunderbolt-software-daemon (27 october release)
> > inside a Debian system (Jessie).
> >
> > If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt 2,
> > device ID 156c), I can see that the thunderbolt-icm driver is loaded
> > and that the thunderbolt-software-daemon is well started. But the
> > Ethernet interface is not created.
> >
> > I have attached to this email the syslog file. There is the logs from
> > both the kernel and the daemon inside. Note that the daemon logs are
> > everything but clear about what could be the issue. Maybe I missed
> > some kind of configuration ? But I failed to find any valuable
> > information about configuring the driver and/or the daemon in the various documentation files.
> >
> > Please, can you provide some guidance ? I'd really like to test your
> > patch series.
>
> First, thank you very much for willing to test it.
> Thunderbolt Networking support was added during Falcon Ridge, in the latest FR images.
> Do you know which Thunderbolt image version you have on your system?
> Currently I submitted only Thunderbolt Networking feature in Linux, and we plan to add
> more features like reading the image version and updating the image.
> If you don't know the image version, the only thing I can suggest is to load windows, install thunderbolt SW
> and check in the Thunderbolt application the image version.
> To know if image update is needed, you can check - https://thunderbolttechnology.net/updates

Hi Amir,

From the Windows Thunderbolt software, I can read 13.00 for the firmware
version. And from https://thunderbolttechnology.net/updates, I can see
that there is no update available for my ASUS motherboard.

Am I good to go ?

BTW, it is quite a shame that the Thunderbolt firmware version can't be
read from Linux.

Simon


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2016-11-18 08:48:51

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Tue, Nov 15 2016, 12:59 PM, Simon Guinot wrote:
> On Wed, Nov 09, 2016 at 03:42:53PM +0000, Levy, Amir (Jer) wrote:
> > On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> > > Hi Amir,
> > >
> > > I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
> > > Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
> > >
> > > Is the thunderbolt-icm driver supposed to work with this chipset ?
> > >
> >
> > Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
> > 156d is the bridge -
> > http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619
> >
> > > I have installed both a 4.8.6 Linux kernel (patched with your v9
> > > series) and the thunderbolt-software-daemon (27 october release)
> > > inside a Debian system (Jessie).
> > >
> > > If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt
> > > 2, device ID 156c), I can see that the thunderbolt-icm driver is
> > > loaded and that the thunderbolt-software-daemon is well started.
> > > But the Ethernet interface is not created.
> > >
> > > I have attached to this email the syslog file. There is the logs
> > > from both the kernel and the daemon inside. Note that the daemon
> > > logs are everything but clear about what could be the issue. Maybe
> > > I missed some kind of configuration ? But I failed to find any
> > > valuable information about configuring the driver and/or the
> > > daemon in
> the various documentation files.
> > >
> > > Please, can you provide some guidance ? I'd really like to test
> > > your patch series.
> >
> > First, thank you very much for willing to test it.
> > Thunderbolt Networking support was added during Falcon Ridge, in the
> latest FR images.
> > Do you know which Thunderbolt image version you have on your system?
> > Currently I submitted only Thunderbolt Networking feature in Linux,
> > and we plan to add more features like reading the image version and
> updating the image.
> > If you don't know the image version, the only thing I can suggest is
> > to load windows, install thunderbolt SW and check in the Thunderbolt
> application the image version.
> > To know if image update is needed, you can check -
> > https://thunderbolttechnology.net/updates
>
> Hi Amir,
>
> From the Windows Thunderbolt software, I can read 13.00 for the
> firmware version. And from https://thunderbolttechnology.net/updates,
> I can see that there is no update available for my ASUS motherboard.
>
> Am I good to go ?
>

Thunderbolt Networking is supported on both Thunderbolt(tm) 2 and Thunderbolt(tm) 3 systems.
Thunderbolt 2 systems must have updated NVM (version 25 or later) in order for the functionality to work properly.
If the system does not have the update, please contact the OEM directly for an updated NVM.
For best functionality and support, Intel recommends using Thunderbolt 3 systems for all validation and testing.

> BTW, it is quite a shame that the Thunderbolt firmware version can't
> be read from Linux.
>

This is WIP, once this patch will be upstream, we will be able to focus more
on aligning Linux with the Thunderbolt features that we have for windows.

Regards,
Amir

2016-11-18 10:06:55

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> > BTW, it is quite a shame that the Thunderbolt firmware version can't
> > be read from Linux.
> >
>
> This is WIP, once this patch will be upstream, we will be able to focus more
> on aligning Linux with the Thunderbolt features that we have for windows.

Why is this patch somehow holding that work back? You aren't just
sitting around waiting for people to review this and not doing anything
else, right? Is there some basic building block in these patches that
your firmware download code is going to rely on?

confused,

greg k-h

2016-11-18 11:20:16

by Simon Guinot

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> On Tue, Nov 15 2016, 12:59 PM, Simon Guinot wrote:
> > On Wed, Nov 09, 2016 at 03:42:53PM +0000, Levy, Amir (Jer) wrote:
> > > On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> > > > Hi Amir,
> > > >
> > > > I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
> > > > Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
> > > >
> > > > Is the thunderbolt-icm driver supposed to work with this chipset ?
> > > >
> > >
> > > Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
> > > 156d is the bridge -
> > > http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619
> > >
> > > > I have installed both a 4.8.6 Linux kernel (patched with your v9
> > > > series) and the thunderbolt-software-daemon (27 october release)
> > > > inside a Debian system (Jessie).
> > > >
> > > > If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt
> > > > 2, device ID 156c), I can see that the thunderbolt-icm driver is
> > > > loaded and that the thunderbolt-software-daemon is well started.
> > > > But the Ethernet interface is not created.
> > > >
> > > > I have attached to this email the syslog file. There is the logs
> > > > from both the kernel and the daemon inside. Note that the daemon
> > > > logs are everything but clear about what could be the issue. Maybe
> > > > I missed some kind of configuration ? But I failed to find any
> > > > valuable information about configuring the driver and/or the
> > > > daemon in
> > the various documentation files.
> > > >
> > > > Please, can you provide some guidance ? I'd really like to test
> > > > your patch series.
> > >
> > > First, thank you very much for willing to test it.
> > > Thunderbolt Networking support was added during Falcon Ridge, in the
> > latest FR images.
> > > Do you know which Thunderbolt image version you have on your system?
> > > Currently I submitted only Thunderbolt Networking feature in Linux,
> > > and we plan to add more features like reading the image version and
> > updating the image.
> > > If you don't know the image version, the only thing I can suggest is
> > > to load windows, install thunderbolt SW and check in the Thunderbolt
> > application the image version.
> > > To know if image update is needed, you can check -
> > > https://thunderbolttechnology.net/updates
> >
> > Hi Amir,
> >
> > From the Windows Thunderbolt software, I can read 13.00 for the
> > firmware version. And from https://thunderbolttechnology.net/updates,
> > I can see that there is no update available for my ASUS motherboard.
> >
> > Am I good to go ?
> >
>
> Thunderbolt Networking is supported on both Thunderbolt(tm) 2 and Thunderbolt(tm) 3 systems.
> Thunderbolt 2 systems must have updated NVM (version 25 or later) in order for the functionality to work properly.
> If the system does not have the update, please contact the OEM directly for an updated NVM.
> For best functionality and support, Intel recommends using Thunderbolt 3 systems for all validation and testing.

Maybe it is worth mentioning in the documentation and/or in the Kconfig
help message that a minimal firmware version is needed for Thunderbolt 2
controllers.

It would have saved some time for me :)

>
> > BTW, it is quite a shame that the Thunderbolt firmware version can't
> > be read from Linux.
> >
>
> This is WIP, once this patch will be upstream, we will be able to focus more
> on aligning Linux with the Thunderbolt features that we have for windows.

Well, I rather see the firmware identification and update as basic
features on the top of which ones you can build a driver. For example in
this case this would allow the ICM driver and/or the userland daemon to
exit with a useful error message rather than just not working without any
explanation.

Next week I'll try the driver with a Thunderbolt 3 controller.

Thanks for your help!

Simon


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2016-11-20 06:30:30

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Fri, Nov 18 2016, 12:07 PM, [email protected] wrote:
> On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> > > BTW, it is quite a shame that the Thunderbolt firmware version can't
> > > be read from Linux.
> > >
> >
> > This is WIP, once this patch will be upstream, we will be able to
> > focus more on aligning Linux with the Thunderbolt features that we have
> for windows.
>
> Why is this patch somehow holding that work back? You aren't just sitting
> around waiting for people to review this and not doing anything else, right?
> Is there some basic building block in these patches that your firmware
> download code is going to rely on?
>
> confused,
>
> greg k-h

All the Thunderbolt SW features (including networking and FW update) depend
on the communication with FW, which is patch 3/8 in the series.
The patch also sets up a generic netlink for user space communication.
So yes, the communication with Thunderbolt FW is a basic building block.

2016-11-21 12:22:37

by Greg Kroah-Hartman

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Sun, Nov 20, 2016 at 06:30:19AM +0000, Levy, Amir (Jer) wrote:
> On Fri, Nov 18 2016, 12:07 PM, [email protected] wrote:
> > On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> > > > BTW, it is quite a shame that the Thunderbolt firmware version can't
> > > > be read from Linux.
> > > >
> > >
> > > This is WIP, once this patch will be upstream, we will be able to
> > > focus more on aligning Linux with the Thunderbolt features that we have
> > for windows.
> >
> > Why is this patch somehow holding that work back? You aren't just sitting
> > around waiting for people to review this and not doing anything else, right?
> > Is there some basic building block in these patches that your firmware
> > download code is going to rely on?
> >
> > confused,
> >
> > greg k-h
>
> All the Thunderbolt SW features (including networking and FW update) depend
> on the communication with FW, which is patch 3/8 in the series.
> The patch also sets up a generic netlink for user space communication.

It's that "generic netlink" connection that I really want a whole lot of
revewers to read over as it's very unusual and "different" from all
other driver subsystems.

thanks,

greg k-h

2016-11-22 17:28:38

by Simon Guinot

[permalink] [raw]
Subject: Re: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Fri, Nov 18, 2016 at 12:20:07PM +0100, Simon Guinot wrote:
> On Fri, Nov 18, 2016 at 08:48:36AM +0000, Levy, Amir (Jer) wrote:
> > On Tue, Nov 15 2016, 12:59 PM, Simon Guinot wrote:
> > > On Wed, Nov 09, 2016 at 03:42:53PM +0000, Levy, Amir (Jer) wrote:
> > > > On Wed, Nov 9 2016, 04:36 PM, Simon Guinot wrote:
> > > > > Hi Amir,
> > > > >
> > > > > I have an ASUS "All Series/Z87-DELUXE/QUAD" motherboard with a
> > > > > Thunderbolt 2 "Falcon Ridge" chipset (device ID 156d).
> > > > >
> > > > > Is the thunderbolt-icm driver supposed to work with this chipset ?
> > > > >
> > > >
> > > > Yes, the thunderbolt-icm supports Falcon Ridge, device ID 156c.
> > > > 156d is the bridge -
> > > > http://lxr.free-electrons.com/source/include/linux/pci_ids.h#L2619
> > > >
> > > > > I have installed both a 4.8.6 Linux kernel (patched with your v9
> > > > > series) and the thunderbolt-software-daemon (27 october release)
> > > > > inside a Debian system (Jessie).
> > > > >
> > > > > If I connect the ASUS motherboard with a MacBook Pro (Thunderbolt
> > > > > 2, device ID 156c), I can see that the thunderbolt-icm driver is
> > > > > loaded and that the thunderbolt-software-daemon is well started.
> > > > > But the Ethernet interface is not created.
> > > > >
> > > > > I have attached to this email the syslog file. There is the logs
> > > > > from both the kernel and the daemon inside. Note that the daemon
> > > > > logs are everything but clear about what could be the issue. Maybe
> > > > > I missed some kind of configuration ? But I failed to find any
> > > > > valuable information about configuring the driver and/or the
> > > > > daemon in
> > > the various documentation files.
> > > > >
> > > > > Please, can you provide some guidance ? I'd really like to test
> > > > > your patch series.
> > > >
> > > > First, thank you very much for willing to test it.
> > > > Thunderbolt Networking support was added during Falcon Ridge, in the
> > > latest FR images.
> > > > Do you know which Thunderbolt image version you have on your system?
> > > > Currently I submitted only Thunderbolt Networking feature in Linux,
> > > > and we plan to add more features like reading the image version and
> > > updating the image.
> > > > If you don't know the image version, the only thing I can suggest is
> > > > to load windows, install thunderbolt SW and check in the Thunderbolt
> > > application the image version.
> > > > To know if image update is needed, you can check -
> > > > https://thunderbolttechnology.net/updates
> > >
> > > Hi Amir,
> > >
> > > From the Windows Thunderbolt software, I can read 13.00 for the
> > > firmware version. And from https://thunderbolttechnology.net/updates,
> > > I can see that there is no update available for my ASUS motherboard.
> > >
> > > Am I good to go ?
> > >
> >
> > Thunderbolt Networking is supported on both Thunderbolt(tm) 2 and Thunderbolt(tm) 3 systems.
> > Thunderbolt 2 systems must have updated NVM (version 25 or later) in order for the functionality to work properly.
> > If the system does not have the update, please contact the OEM directly for an updated NVM.
> > For best functionality and support, Intel recommends using Thunderbolt 3 systems for all validation and testing.
>
> Maybe it is worth mentioning in the documentation and/or in the Kconfig
> help message that a minimal firmware version is needed for Thunderbolt 2
> controllers.
>
> It would have saved some time for me :)
>
> >
> > > BTW, it is quite a shame that the Thunderbolt firmware version can't
> > > be read from Linux.
> > >
> >
> > This is WIP, once this patch will be upstream, we will be able to focus more
> > on aligning Linux with the Thunderbolt features that we have for windows.
>
> Well, I rather see the firmware identification and update as basic
> features on the top of which ones you can build a driver. For example in
> this case this would allow the ICM driver and/or the userland daemon to
> exit with a useful error message rather than just not working without any
> explanation.
>
> Next week I'll try the driver with a Thunderbolt 3 controller.

Hi Amir,

I tested the thunderbolt-icm driver (v9 series) on an Gigabyte
motherboard (Z170X-UD5 TH-CF) with a Thunderbolt 3 controller (Alpine
Ridge 4C).

I can see that the network interface is well created when the
motherboard is connected to a MacBook Pro (Thunderbolt 2 or 3).

And here are the TCP bandwidths measured using the iperf3 benchmark:

- MacBook Pro Thunderbolt 2: 8.46Gbits/sec
- MacBook Pro Thunderbolt 3: 11.8Gbits/sec

Are this results consistent with your expectations ?

From the MacOS system interface on the MacBook Pro Thunderbolt 3,
I noticed that the interface appears as dual lane (2x 20Gb/sec). But
when two MacBook Pro are connected together, the interface appears as
single lane (1x 40Gb/sec). Is some lane bonding support missing in the
Linux implementation ?

Here are a couple of additional questions:

- When the network interface is created, there is no IP address
assigned (or negotiated ?) on the Linux side. But it is done on the
MacOS side. And in the Linux kernel logs I can also read the message:
"ready for ThunderboltIP negotiation". Is there something missing or
not working on the Linux side ? What is the correct way to configure
or negotiate the IP address. For my tests I did it manually...

- When the Linux machine is started with the Thunderbolt wire already
connected to a MacBook Pro, sometimes (but not every time) the
network interface is not created. The Thunderbolt wire needs to be
replugged.

FWIW you get my

Tested-by: Simon Guinot <[email protected]>

Simon


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2016-11-22 17:36:20

by Mario Limonciello

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

> Here are a couple of additional questions:
>
> - When the network interface is created, there is no IP address
> assigned (or negotiated ?) on the Linux side. But it is done on the
> MacOS side. And in the Linux kernel logs I can also read the message:
> "ready for ThunderboltIP negotiation". Is there something missing or
> not working on the Linux side ? What is the correct way to configure
> or negotiate the IP address. For my tests I did it manually...
>
> - When the Linux machine is started with the Thunderbolt wire already
> connected to a MacBook Pro, sometimes (but not every time) the
> network interface is not created. The Thunderbolt wire needs to be
> replugged.
>
> FWIW you get my
>
> Tested-by: Simon Guinot <[email protected]>
>
> Simon

Simon,

Since I also performed testing on the previous patchset, I'll share what I did.

I configured Network Manager to use the TBT interface to share an internet
connection to another box. This configures a static IP address on the local
Linux side and sets up routing.

Network manager remembers setup this in a configuration database.
When the interface goes up it will then set up a DHCP server to hand
out an IP address to the other side.



2016-11-24 20:35:37

by Levy, Amir (Jer)

[permalink] [raw]
Subject: RE: [PATCH v9 0/8] thunderbolt: Introducing Thunderbolt(TM) Networking

On Tue, Nov 22 2016, 07:28 PM, Simon Guinot wrote:
> Hi Amir,
>
> I tested the thunderbolt-icm driver (v9 series) on an Gigabyte
> motherboard
> (Z170X-UD5 TH-CF) with a Thunderbolt 3 controller (Alpine Ridge 4C).
>
> I can see that the network interface is well created when the
> motherboard is connected to a MacBook Pro (Thunderbolt 2 or 3).
>
> And here are the TCP bandwidths measured using the iperf3 benchmark:

AFAIK, in UD5, Thunderbolt 3 is installed on 4 lanes of PCI Express Gen 3,
which is good for performance.

>
> - MacBook Pro Thunderbolt 2: 8.46Gbits/sec
> - MacBook Pro Thunderbolt 3: 11.8Gbits/sec
>
> Are this results consistent with your expectations ?

Thunderbolt 2 - yes,
Thunderbolt 3 - we didn't check the bandwidth with MacBook Pro Thunderbolt 3 yet.
The bandwidth in Linux<->Linux and Linux<->Windows setups with Thunderbolt 3
is around 15G (one direction).

>
> From the MacOS system interface on the MacBook Pro Thunderbolt 3, I
> noticed that the interface appears as dual lane (2x 20Gb/sec). But
> when two MacBook Pro are connected together, the interface appears as
> single lane (1x 40Gb/sec). Is some lane bonding support missing in the
> Linux implementation ?

At the moment the iCM doesn't lane bond the inter domain link.
This will be added in a future drop of the iCM once the networking BW will be such that requires the bonding.

>
> Here are a couple of additional questions:
>
> - When the network interface is created, there is no IP address
> assigned (or negotiated ?) on the Linux side. But it is done on the
> MacOS side. And in the Linux kernel logs I can also read the message:
> "ready for ThunderboltIP negotiation". Is there something missing or
> not working on the Linux side ? What is the correct way to configure
> or negotiate the IP address. For my tests I did it manually...

This is not related to Thunderbolt, but to OS administration.
I usually use ZeroConf in any OS that support Thunderbolt Networking, but static IP also works.
"ready for ThunderboltIP negotiation" is an important part of the path establishment, but isn't related to IP address.

Thanks,
Amir