Return-Path: From: Ville Tervo To: linux-bluetooth@vger.kernel.org Cc: Ville Tervo Subject: [PATCH 3/6] Bluetooth: Use LE buffers for LE traffic Date: Mon, 18 Oct 2010 16:02:53 +0300 Message-Id: <1287406976-13463-4-git-send-email-ville.tervo@nokia.com> In-Reply-To: <1287406976-13463-1-git-send-email-ville.tervo@nokia.com> References: <1287406976-13463-1-git-send-email-ville.tervo@nokia.com> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: BLuetooth chips may have separate buffers for LE traffic. This patch add support to use LE buffers provided by the chip. Signed-off-by: Ville Tervo --- include/net/bluetooth/hci.h | 2 + include/net/bluetooth/hci_core.h | 5 +++ net/bluetooth/hci_conn.c | 6 +++ net/bluetooth/hci_core.c | 74 +++++++++++++++++++++++++++++++++++-- net/bluetooth/hci_event.c | 40 +++++++++++++++++++- 5 files changed, 121 insertions(+), 6 deletions(-) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index 02055b9..b42edf0 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -189,6 +189,8 @@ enum { #define LMP_EV4 0x01 #define LMP_EV5 0x02 +#define LMP_NO_BREDR 0x20 +#define LMP_LE 0x40 #define LMP_SNIFF_SUBR 0x02 #define LMP_EDR_ESCO_2M 0x20 diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index fc2aaee..326d290 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -103,15 +103,19 @@ struct hci_dev { atomic_t cmd_cnt; unsigned int acl_cnt; unsigned int sco_cnt; + unsigned int le_cnt; unsigned int acl_mtu; unsigned int sco_mtu; + unsigned int le_mtu; unsigned int acl_pkts; unsigned int sco_pkts; + unsigned int le_pkts; unsigned long cmd_last_tx; unsigned long acl_last_tx; unsigned long sco_last_tx; + unsigned long le_last_tx; struct workqueue_struct *workqueue; @@ -469,6 +473,7 @@ void hci_conn_del_sysfs(struct hci_conn *conn); #define lmp_sniffsubr_capable(dev) ((dev)->features[5] & LMP_SNIFF_SUBR) #define lmp_esco_capable(dev) ((dev)->features[3] & LMP_ESCO) #define lmp_ssp_capable(dev) ((dev)->features[6] & LMP_SIMPLE_PAIR) +#define lmp_le_capable(dev) ((dev)->features[4] & LMP_LE) /* ----- HCI protocols ----- */ struct hci_proto { diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index c1eb8e0..c7309e4 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -324,6 +324,11 @@ int hci_conn_del(struct hci_conn *conn) /* Unacked frames */ hdev->acl_cnt += conn->sent; + } else if (conn->type == LE_LINK) { + if (hdev->le_pkts) + hdev->le_cnt += conn->sent; + else + hdev->acl_cnt += conn->sent; } else { struct hci_conn *acl = conn->link; if (acl) { @@ -409,6 +414,7 @@ struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 return NULL; hci_le_connect(le); + hci_conn_hold(le); return le; } diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index bc2a052..45c78c2 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -254,6 +254,14 @@ static void hci_init_req(struct hci_dev *hdev, unsigned long opt) hci_send_cmd(hdev, HCI_OP_WRITE_CA_TIMEOUT, 2, ¶m); } +static void hci_le_init_req(struct hci_dev *hdev, unsigned long opt) +{ + BT_DBG("%s", hdev->name); + + /* Read LE buffer size */ + hci_send_cmd(hdev, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL); +} + static void hci_scan_req(struct hci_dev *hdev, unsigned long opt) { __u8 scan = opt; @@ -509,6 +517,10 @@ int hci_dev_open(__u16 dev) ret = __hci_request(hdev, hci_init_req, 0, msecs_to_jiffies(HCI_INIT_TIMEOUT)); + if (lmp_le_capable(hdev)) + ret = __hci_request(hdev, hci_le_init_req, 0, + msecs_to_jiffies(HCI_INIT_TIMEOUT)); + clear_bit(HCI_INIT, &hdev->flags); } @@ -645,7 +657,7 @@ int hci_dev_reset(__u16 dev) hdev->flush(hdev); atomic_set(&hdev->cmd_cnt, 1); - hdev->acl_cnt = 0; hdev->sco_cnt = 0; + hdev->acl_cnt = 0; hdev->sco_cnt = 0; hdev->le_cnt = 0; if (!test_bit(HCI_RAW, &hdev->flags)) ret = __hci_request(hdev, hci_reset_req, 0, @@ -1456,8 +1468,25 @@ static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int } if (conn) { - int cnt = (type == ACL_LINK ? hdev->acl_cnt : hdev->sco_cnt); - int q = cnt / num; + int cnt, q; + + switch (conn->type) { + case ACL_LINK: + cnt = hdev->acl_cnt; + break; + case SCO_LINK: + case ESCO_LINK: + cnt = hdev->sco_cnt; + break; + case LE_LINK: + cnt = hdev->le_mtu ? hdev->le_cnt : hdev->acl_cnt; + break; + default: + cnt = 0; + BT_ERR("Unknown link type"); + } + + q = cnt / num; *quote = q ? q : 1; } else *quote = 0; @@ -1556,6 +1585,40 @@ static inline void hci_sched_esco(struct hci_dev *hdev) } } +static inline void hci_sched_le(struct hci_dev *hdev) +{ + struct hci_conn *conn; + struct sk_buff *skb; + int quote, cnt; + + BT_DBG("%s", hdev->name); + + if (!test_bit(HCI_RAW, &hdev->flags)) { + /* ACL tx timeout must be longer than maximum + * link supervision timeout (40.9 seconds) */ + if (!hdev->le_cnt && + time_after(jiffies, hdev->le_last_tx + HZ * 45)) + hci_acl_tx_to(hdev); + } + + cnt = hdev->le_pkts ? hdev->le_cnt : hdev->acl_cnt; + while (cnt && (conn = hci_low_sent(hdev, LE_LINK, "e))) { + while (quote-- && (skb = skb_dequeue(&conn->data_q))) { + BT_DBG("skb %p len %d", skb, skb->len); + + hci_send_frame(skb); + hdev->le_last_tx = jiffies; + + cnt--; + conn->sent++; + } + } + if (hdev->le_pkts) + hdev->le_cnt = cnt; + else + hdev->acl_cnt = cnt; +} + static void hci_tx_task(unsigned long arg) { struct hci_dev *hdev = (struct hci_dev *) arg; @@ -1563,7 +1626,8 @@ static void hci_tx_task(unsigned long arg) read_lock(&hci_task_lock); - BT_DBG("%s acl %d sco %d", hdev->name, hdev->acl_cnt, hdev->sco_cnt); + BT_DBG("%s acl %d sco %d le %d", hdev->name, hdev->acl_cnt, + hdev->sco_cnt, hdev->le_cnt); /* Schedule queues and send stuff to HCI driver */ @@ -1573,6 +1637,8 @@ static void hci_tx_task(unsigned long arg) hci_sched_esco(hdev); + hci_sched_le(hdev); + /* Send next queued raw (unknown type) packet */ while ((skb = skb_dequeue(&hdev->raw_q))) hci_send_frame(skb); diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 4061613..499c823 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -539,6 +539,26 @@ static void hci_cc_read_bd_addr(struct hci_dev *hdev, struct sk_buff *skb) hci_req_complete(hdev, rp->status); } +static void hci_cc_le_read_buffer_size(struct hci_dev *hdev, + struct sk_buff *skb) +{ + struct hci_rp_le_read_buffer_size *rp = (void *) skb->data; + + BT_DBG("%s status 0x%x", hdev->name, rp->status); + + if (rp->status) + return; + + hdev->le_mtu = __le16_to_cpu(rp->le_mtu); + hdev->le_pkts = rp->le_max_pkt; + + hdev->le_cnt = hdev->le_pkts; + + BT_DBG("%s le mtu %d:%d", hdev->name, hdev->le_mtu, hdev->le_pkts); + + hci_req_complete(hdev, rp->status); +} + static inline void hci_cs_inquiry(struct hci_dev *hdev, __u8 status) { BT_DBG("%s status 0x%x", hdev->name, status); @@ -1352,6 +1372,10 @@ static inline void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *sk hci_cc_read_bd_addr(hdev, skb); break; + case HCI_OP_LE_READ_BUFFER_SIZE: + hci_cc_le_read_buffer_size(hdev, skb); + break; + default: BT_DBG("%s opcode 0x%x", hdev->name, opcode); break; @@ -1489,10 +1513,22 @@ static inline void hci_num_comp_pkts_evt(struct hci_dev *hdev, struct sk_buff *s conn->sent -= count; if (conn->type == ACL_LINK) { - if ((hdev->acl_cnt += count) > hdev->acl_pkts) + hdev->acl_cnt += count; + if (hdev->acl_cnt > hdev->acl_pkts) hdev->acl_cnt = hdev->acl_pkts; + } else if (conn->type == LE_LINK) { + if (hdev->le_pkts) { + hdev->le_cnt += count; + if (hdev->le_cnt > hdev->le_pkts) + hdev->le_cnt = hdev->le_pkts; + } else { + hdev->acl_cnt += count; + if (hdev->acl_cnt > hdev->acl_pkts) + hdev->acl_cnt = hdev->acl_pkts; + } } else { - if ((hdev->sco_cnt += count) > hdev->sco_pkts) + hdev->sco_cnt += count; + if (hdev->sco_cnt > hdev->sco_pkts) hdev->sco_cnt = hdev->sco_pkts; } } -- 1.7.1