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Subject: Re: [RFC 1/2] vhost: IFC VF hardware operation layer
To:     Zhu Lingshan <lingshan.zhu@intel.com>, mst@redhat.com,
        alex.williamson@redhat.com
Cc:     linux-kernel@vger.kernel.org,
        virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
        netdev@vger.kernel.org, dan.daly@intel.com,
        cunming.liang@intel.com, tiwei.bie@intel.com, jason.zeng@intel.com,
        zhiyuan.lv@intel.com
References: <20191016013050.3918-1-lingshan.zhu@intel.com>
 <20191016013050.3918-2-lingshan.zhu@intel.com>
From:   Jason Wang <jasowang@redhat.com>
Message-ID: <991d41c6-4032-6341-f6c8-6e69d698f629@redhat.com>
Date:   Wed, 16 Oct 2019 16:40:13 +0800
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On 2019/10/16 上午9:30, Zhu Lingshan wrote:
> This commit introduced ifcvf_base layer, which handles IFC VF NIC
> hardware operations and configurations.


It's better to describe the difference between ifc vf and virtio in the 
commit log or is there a open doc for this?


>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
> ---
>   drivers/vhost/ifcvf/ifcvf_base.c | 390 +++++++++++++++++++++++++++++++++++++++
>   drivers/vhost/ifcvf/ifcvf_base.h | 137 ++++++++++++++
>   2 files changed, 527 insertions(+)
>   create mode 100644 drivers/vhost/ifcvf/ifcvf_base.c
>   create mode 100644 drivers/vhost/ifcvf/ifcvf_base.h
>
> diff --git a/drivers/vhost/ifcvf/ifcvf_base.c b/drivers/vhost/ifcvf/ifcvf_base.c
> new file mode 100644
> index 000000000000..b85e14c9bdcf
> --- /dev/null
> +++ b/drivers/vhost/ifcvf/ifcvf_base.c
> @@ -0,0 +1,390 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2019 Intel Corporation.
> + */
> +
> +#include "ifcvf_base.h"
> +
> +static void *get_cap_addr(struct ifcvf_hw *hw, struct virtio_pci_cap *cap)
> +{
> +	u8 bar = cap->bar;
> +	u32 length = cap->length;
> +	u32 offset = cap->offset;
> +	struct ifcvf_adapter *ifcvf =
> +		container_of(hw, struct ifcvf_adapter, vf);
> +
> +	if (bar >= IFCVF_PCI_MAX_RESOURCE) {
> +		IFC_ERR(ifcvf->dev,
> +			"Invalid bar number %u to get capabilities.\n", bar);
> +		return NULL;
> +	}
> +
> +	if (offset + length < offset) {
> +		IFC_ERR(ifcvf->dev, "offset(%u) + length(%u) overflows\n",
> +			offset, length);
> +		return NULL;
> +	}
> +
> +	if (offset + length > hw->mem_resource[cap->bar].len) {
> +		IFC_ERR(ifcvf->dev,
> +			"offset(%u) + len(%u) overflows bar%u to get capabilities.\n",
> +			offset, length, bar);
> +		return NULL;
> +	}
> +
> +	return hw->mem_resource[bar].addr + offset;
> +}
> +
> +int ifcvf_read_config_range(struct pci_dev *dev,
> +			uint32_t *val, int size, int where)
> +{
> +	int i;
> +
> +	for (i = 0; i < size; i += 4) {
> +		if (pci_read_config_dword(dev, where + i, val + i / 4) < 0)
> +			return -1;
> +	}
> +	return 0;
> +}
> +
> +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev)
> +{
> +	int ret;
> +	u8 pos;
> +	struct virtio_pci_cap cap;
> +	u32 i;
> +	u16 notify_off;
> +
> +	ret = pci_read_config_byte(dev, PCI_CAPABILITY_LIST, &pos);
> +
> +	if (ret < 0) {
> +		IFC_ERR(&dev->dev, "failed to read PCI capability list.\n");
> +		return -EIO;
> +	}
> +
> +	while (pos) {
> +		ret = ifcvf_read_config_range(dev, (u32 *)&cap,
> +				sizeof(cap), pos);
> +
> +		if (ret < 0) {
> +			IFC_ERR(&dev->dev, "failed to get PCI capability at %x",
> +					pos);
> +			break;
> +		}
> +
> +		if (cap.cap_vndr != PCI_CAP_ID_VNDR)
> +			goto next;
> +
> +		IFC_INFO(&dev->dev, "read PCI config:\n"
> +					"config type: %u.\n"
> +					"PCI bar: %u.\n"
> +					"PCI bar offset: %u.\n"
> +					"PCI config len: %u.\n",
> +					cap.cfg_type, cap.bar,
> +					cap.offset, cap.length);
> +
> +		switch (cap.cfg_type) {
> +		case VIRTIO_PCI_CAP_COMMON_CFG:
> +			hw->common_cfg = get_cap_addr(hw, &cap);
> +			IFC_INFO(&dev->dev, "hw->common_cfg = %p.\n",
> +					hw->common_cfg);
> +			break;
> +		case VIRTIO_PCI_CAP_NOTIFY_CFG:
> +			pci_read_config_dword(dev, pos + sizeof(cap),
> +				&hw->notify_off_multiplier);
> +			hw->notify_bar = cap.bar;
> +			hw->notify_base = get_cap_addr(hw, &cap);
> +			IFC_INFO(&dev->dev, "hw->notify_base = %p.\n",
> +					hw->notify_base);
> +			break;
> +		case VIRTIO_PCI_CAP_ISR_CFG:
> +			hw->isr = get_cap_addr(hw, &cap);
> +			IFC_INFO(&dev->dev, "hw->isr = %p.\n", hw->isr);
> +			break;
> +		case VIRTIO_PCI_CAP_DEVICE_CFG:
> +			hw->dev_cfg = get_cap_addr(hw, &cap);
> +			IFC_INFO(&dev->dev, "hw->dev_cfg = %p.\n", hw->dev_cfg);
> +			break;
> +		}
> +next:
> +		pos = cap.cap_next;
> +	}
> +
> +	if (hw->common_cfg == NULL || hw->notify_base == NULL ||
> +		hw->isr == NULL || hw->dev_cfg == NULL) {
> +		IFC_ERR(&dev->dev, "Incomplete PCI capabilities.\n");
> +		return -1;
> +	}
> +
> +	for (i = 0; i < (IFCVF_MAX_QUEUE_PAIRS * 2); i++) {


Any reason for using hard coded queue pairs limit other than the 
max_queue_pairs in the net config?


> +		iowrite16(i, &hw->common_cfg->queue_select);
> +		notify_off = ioread16(&hw->common_cfg->queue_notify_off);
> +		hw->notify_addr[i] = (void *)((u8 *)hw->notify_base +
> +				notify_off * hw->notify_off_multiplier);
> +	}
> +
> +	hw->lm_cfg = hw->mem_resource[4].addr;
> +
> +	IFC_INFO(&dev->dev, "PCI capability mapping:\n"
> +				"common cfg: %p\n"
> +				"notify base: %p\n"
> +				"isr cfg: %p\n"
> +				"device cfg: %p\n"
> +				"multiplier: %u\n",
> +				hw->common_cfg,
> +				hw->notify_base,
> +				hw->isr,
> +				hw->dev_cfg,
> +				hw->notify_off_multiplier);
> +
> +	return 0;
> +}
> +
> +static u8 ifcvf_get_status(struct ifcvf_hw *hw)
> +{
> +	return ioread8(&hw->common_cfg->device_status);
> +}
> +
> +static void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
> +{
> +	iowrite8(status, &hw->common_cfg->device_status);
> +}
> +
> +static void ifcvf_reset(struct ifcvf_hw *hw)
> +{
> +	ifcvf_set_status(hw, 0);
> +
> +	/* flush status write */
> +	ifcvf_get_status(hw);


Why this flush is needed?


> +	hw->generation++;
> +}
> +
> +static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
> +{
> +	if (status != 0)
> +		status |= ifcvf_get_status(hw);
> +
> +	ifcvf_set_status(hw, status);
> +	ifcvf_get_status(hw);
> +}
> +
> +u64 ifcvf_get_features(struct ifcvf_hw *hw)
> +{
> +	u32 features_lo, features_hi;
> +	struct virtio_pci_common_cfg *cfg = hw->common_cfg;
> +
> +	iowrite32(0, &cfg->device_feature_select);
> +	features_lo = ioread32(&cfg->device_feature);
> +
> +	iowrite32(1, &cfg->device_feature_select);
> +	features_hi = ioread32(&cfg->device_feature);
> +
> +	return ((u64)features_hi << 32) | features_lo;
> +}
> +static int ifcvf_with_feature(struct ifcvf_hw *hw, u64 bit)
> +{
> +	return (hw->req_features & (1ULL << bit)) != 0;
> +}
> +
> +static void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset,
> +		       void *dst, int length)
> +{
> +	int i;
> +	u8 *p;
> +	u8 old_gen, new_gen;
> +
> +	do {
> +		old_gen = ioread8(&hw->common_cfg->config_generation);
> +
> +		p = dst;
> +		for (i = 0; i < length; i++)
> +			*p++ = ioread8((u8 *)hw->dev_cfg + offset + i);
> +
> +		new_gen = ioread8(&hw->common_cfg->config_generation);
> +	} while (old_gen != new_gen);
> +}
> +
> +void ifcvf_get_linkstatus(struct ifcvf_hw *hw, u8 *is_linkup)
> +{


Why not just return bollean?


> +	u16 status;
> +	u64 host_features;
> +
> +	host_features = ifcvf_get_features(hw);
> +	if (ifcvf_with_feature(hw, VIRTIO_NET_F_STATUS)) {
> +		ifcvf_read_dev_config(hw,
> +				offsetof(struct ifcvf_net_config, status),
> +				&status, sizeof(status));
> +		if ((status & VIRTIO_NET_S_LINK_UP) == 0)
> +			(*is_linkup) = 1;
> +		else
> +			(*is_linkup) = 0;
> +	} else
> +		(*is_linkup) = 0;
> +}
> +
> +static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
> +{
> +	struct virtio_pci_common_cfg *cfg = hw->common_cfg;
> +
> +	iowrite32(0, &cfg->guest_feature_select);
> +	iowrite32(features & ((1ULL << 32) - 1), &cfg->guest_feature);
> +
> +	iowrite32(1, &cfg->guest_feature_select);
> +	iowrite32(features >> 32, &cfg->guest_feature);
> +}
> +
> +static int ifcvf_config_features(struct ifcvf_hw *hw)
> +{
> +	u64 host_features;
> +	struct ifcvf_adapter *ifcvf =
> +		container_of(hw, struct ifcvf_adapter, vf);
> +
> +	host_features = ifcvf_get_features(hw);
> +	hw->req_features &= host_features;


Is this a must, can't device deal with this?


> +
> +	ifcvf_set_features(hw, hw->req_features);
> +	ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
> +
> +	if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
> +		IFC_ERR(ifcvf->dev, "Failed to set FEATURES_OK status\n");
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
> +static void io_write64_twopart(u64 val, u32 *lo, u32 *hi)
> +{
> +	iowrite32(val & ((1ULL << 32) - 1), lo);
> +	iowrite32(val >> 32, hi);
> +}
> +
> +static int ifcvf_hw_enable(struct ifcvf_hw *hw)
> +{
> +	struct virtio_pci_common_cfg *cfg;
> +	u8 *lm_cfg;
> +	u32 i;
> +	struct ifcvf_adapter *ifcvf =
> +		container_of(hw, struct ifcvf_adapter, vf);
> +
> +	cfg = hw->common_cfg;
> +	lm_cfg = hw->lm_cfg;
> +
> +	iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
> +	if (ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
> +		IFC_ERR(ifcvf->dev, "No msix vector for device config.\n");
> +		return -1;
> +	}
> +
> +	for (i = 0; i < hw->nr_vring; i++) {
> +		iowrite16(i, &cfg->queue_select);
> +		io_write64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
> +				&cfg->queue_desc_hi);
> +		io_write64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
> +				&cfg->queue_avail_hi);
> +		io_write64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
> +				&cfg->queue_used_hi);
> +		iowrite16(hw->vring[i].size, &cfg->queue_size);
> +
> +		*(u32 *)(lm_cfg + IFCVF_LM_RING_STATE_OFFSET +
> +				(i / 2) * IFCVF_LM_CFG_SIZE + (i % 2) * 4) =
> +			(u32)hw->vring[i].last_avail_idx |
> +			((u32)hw->vring[i].last_used_idx << 16);
> +
> +		iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
> +		if (ioread16(&cfg->queue_msix_vector) ==
> +				VIRTIO_MSI_NO_VECTOR) {
> +			IFC_ERR(ifcvf->dev,
> +				"No msix vector for queue %u.\n", i);
> +			return -1;
> +		}
> +
> +		iowrite16(1, &cfg->queue_enable);
> +	}
> +
> +	return 0;
> +}
> +
> +static void ifcvf_hw_disable(struct ifcvf_hw *hw)
> +{
> +	u32 i;
> +	struct virtio_pci_common_cfg *cfg;
> +
> +	cfg = hw->common_cfg;
> +
> +	iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
> +	for (i = 0; i < hw->nr_vring; i++) {
> +		iowrite16(i, &cfg->queue_select);
> +		iowrite16(0, &cfg->queue_enable);
> +		iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
> +	}
> +}
> +
> +int ifcvf_start_hw(struct ifcvf_hw *hw)
> +{
> +	ifcvf_reset(hw);
> +	ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
> +	ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
> +
> +	if (ifcvf_config_features(hw) < 0)
> +		return -1;
> +
> +	if (ifcvf_hw_enable(hw) < 0)
> +		return -1;
> +
> +	ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
> +
> +	return 0;
> +}
> +
> +void ifcvf_stop_hw(struct ifcvf_hw *hw)
> +{
> +	ifcvf_hw_disable(hw);
> +	ifcvf_reset(hw);
> +}
> +
> +void ifcvf_enable_logging_vf(struct ifcvf_hw *hw, u64 log_base, u64 log_size)
> +{
> +	u8 *lm_cfg;
> +
> +	lm_cfg = hw->lm_cfg;
> +
> +	*(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_LOW) =
> +		log_base & IFCVF_32_BIT_MASK;
> +
> +	*(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_HIGH) =
> +		(log_base >> 32) & IFCVF_32_BIT_MASK;
> +
> +	*(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_LOW) =
> +		(log_base + log_size) & IFCVF_32_BIT_MASK;
> +
> +	*(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_HIGH) =
> +		((log_base + log_size) >> 32) & IFCVF_32_BIT_MASK;
> +
> +	*(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_ENABLE_VF;
> +}


Is the device using iova or gpa for the logging?


> +
> +void ifcvf_disable_logging(struct ifcvf_hw *hw)
> +{
> +	u8 *lm_cfg;
> +
> +	lm_cfg = hw->lm_cfg;
> +	*(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_DISABLE;
> +}
> +
> +void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
> +{
> +
> +	iowrite16(qid, hw->notify_addr[qid]);
> +}
> +
> +u8 ifcvf_get_notify_region(struct ifcvf_hw *hw)
> +{
> +	return hw->notify_bar;
> +}
> +
> +u64 ifcvf_get_queue_notify_off(struct ifcvf_hw *hw, int qid)
> +{
> +	return (u8 *)hw->notify_addr[qid] -
> +		(u8 *)hw->mem_resource[hw->notify_bar].addr;
> +}
> diff --git a/drivers/vhost/ifcvf/ifcvf_base.h b/drivers/vhost/ifcvf/ifcvf_base.h
> new file mode 100644
> index 000000000000..1ab1a1c40f24
> --- /dev/null
> +++ b/drivers/vhost/ifcvf/ifcvf_base.h
> @@ -0,0 +1,137 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Copyright (C) 2019 Intel Corporation.
> + */
> +
> +#ifndef _IFCVF_H_
> +#define _IFCVF_H_
> +
> +#include <linux/virtio_mdev.h>
> +#include <linux/pci.h>
> +#include <linux/pci_regs.h>
> +#include <uapi/linux/virtio_net.h>
> +#include <uapi/linux/virtio_config.h>
> +#include <uapi/linux/virtio_pci.h>
> +
> +#define IFCVF_VENDOR_ID         0x1AF4
> +#define IFCVF_DEVICE_ID         0x1041
> +#define IFCVF_SUBSYS_VENDOR_ID  0x8086
> +#define IFCVF_SUBSYS_DEVICE_ID  0x001A
> +
> +/*
> + * Some ifcvf feature bits (currently bits 28 through 31) are
> + * reserved for the transport being used (eg. ifcvf_ring), the
> + * rest are per-device feature bits.
> + */
> +#define IFCVF_TRANSPORT_F_START 28
> +#define IFCVF_TRANSPORT_F_END   34
> +
> +#define IFC_SUPPORTED_FEATURES \
> +		((1ULL << VIRTIO_NET_F_MAC)			| \
> +		 (1ULL << VIRTIO_F_ANY_LAYOUT)			| \
> +		 (1ULL << VIRTIO_F_VERSION_1)			| \
> +		 (1ULL << VHOST_F_LOG_ALL)			| \
> +		 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE)		| \
> +		 (1ULL << VIRTIO_NET_F_CTRL_VQ)			| \
> +		 (1ULL << VIRTIO_NET_F_STATUS)			| \
> +		 (1ULL << VIRTIO_NET_F_MRG_RXBUF)) /* not fully supported */
> +
> +#define IFCVF_MAX_QUEUE_PAIRS		1
> +#define IFCVF_MAX_QUEUES		2
> +
> +#define IFCVF_QUEUE_ALIGNMENT		PAGE_SIZE
> +
> +#define IFCVF_MSI_CONFIG_OFF	0
> +#define IFCVF_MSI_QUEUE_OFF	1
> +#define IFCVF_PCI_MAX_RESOURCE	6
> +
> +/* 46 bit CPU physical address, avoid overlap */
> +#define LM_IOVA 0x400000000000
> +
> +#define IFCVF_LM_CFG_SIZE		0x40
> +#define IFCVF_LM_RING_STATE_OFFSET	0x20
> +
> +#define IFCVF_LM_LOGGING_CTRL		0x0
> +
> +#define IFCVF_LM_BASE_ADDR_LOW		0x10
> +#define IFCVF_LM_BASE_ADDR_HIGH		0x14
> +#define IFCVF_LM_END_ADDR_LOW		0x18
> +#define IFCVF_LM_END_ADDR_HIGH		0x1c
> +
> +#define IFCVF_LM_DISABLE		0x0
> +#define IFCVF_LM_ENABLE_VF		0x1
> +#define IFCVF_LM_ENABLE_PF		0x3
> +
> +#define IFCVF_32_BIT_MASK		0xffffffff
> +
> +#define IFC_ERR(dev, fmt, ...)	dev_err(dev, fmt, ##__VA_ARGS__)
> +#define IFC_INFO(dev, fmt, ...)	dev_info(dev, fmt, ##__VA_ARGS__)
> +
> +struct ifcvf_net_config {
> +	u8    mac[6];
> +	u16   status;
> +	u16   max_virtqueue_pairs;
> +} __packed;
> +
> +struct ifcvf_pci_mem_resource {
> +	u64      phys_addr; /**< Physical address, 0 if not resource. */
> +	u64      len;       /**< Length of the resource. */
> +	u8       *addr;     /**< Virtual address, NULL when not mapped. */
> +};
> +
> +struct vring_info {
> +	u64 desc;
> +	u64 avail;
> +	u64 used;
> +	u16 size;
> +	u16 last_avail_idx;
> +	u16 last_used_idx;
> +	bool ready;
> +	char msix_name[256];
> +	struct virtio_mdev_callback cb;
> +};
> +
> +struct ifcvf_hw {
> +	u8	*isr;
> +	u8	notify_bar;
> +	u8	*lm_cfg;
> +	u8	status;
> +	u8	nr_vring;


Is the the number of queue currently used?


> +	u16	*notify_base;
> +	u16	*notify_addr[IFCVF_MAX_QUEUE_PAIRS * 2];
> +	u32	generation;
> +	u32	notify_off_multiplier;
> +	u64	req_features;
> +	struct	virtio_pci_common_cfg *common_cfg;
> +	struct	ifcvf_net_config *dev_cfg;
> +	struct	vring_info vring[IFCVF_MAX_QUEUE_PAIRS * 2];
> +	struct	ifcvf_pci_mem_resource mem_resource[IFCVF_PCI_MAX_RESOURCE];
> +};
> +
> +#define IFC_PRIVATE_TO_VF(adapter) \
> +	(&((struct ifcvf_adapter *)adapter)->vf)
> +
> +#define IFCVF_MAX_INTR (IFCVF_MAX_QUEUE_PAIRS * 2 + 1)


The extra one means the config interrupt?


> +
> +struct ifcvf_adapter {
> +	struct	device *dev;
> +	struct	mutex mdev_lock;


Not used in the patch, move to next one?


> +	int	mdev_count;


Not used.


> +	struct	list_head dma_maps;


This is not used.

Thanks


> +	int	vectors;
> +	struct	ifcvf_hw vf;
> +};
> +
> +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev);
> +u64 ifcvf_get_features(struct ifcvf_hw *hw);
> +int ifcvf_start_hw(struct ifcvf_hw *hw);
> +void ifcvf_stop_hw(struct ifcvf_hw *hw);
> +void ifcvf_enable_logging(struct ifcvf_hw *hw, u64 log_base, u64 log_size);
> +void ifcvf_enable_logging_vf(struct ifcvf_hw *hw, u64 log_base, u64 log_size);
> +void ifcvf_disable_logging(struct ifcvf_hw *hw);
> +void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid);
> +void ifcvf_get_linkstatus(struct ifcvf_hw *hw, u8 *is_linkup);
> +u8 ifcvf_get_notify_region(struct ifcvf_hw *hw);
> +u64 ifcvf_get_queue_notify_off(struct ifcvf_hw *hw, int qid);
> +
> +#endif /* _IFCVF_H_ */