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Bluetooth: Add initial reliable packet support for Three-wire UART

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This patch adds initial support for reliable packets along with the
necessary retransmission timer for the Three-wire UART HCI driver.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Johan Hedberg 2012-07-16 16:12:04 +03:00 • committed by Gustavo Padovan
parent 7d664fbafa
commit 3f27e95b83
1 changed files with 56 additions and 0 deletions
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56
drivers/bluetooth/hci_h5.c
View file

@ -30,6 +30,10 @@
#include "hci_uart.h" #include "hci_uart.h"
#define H5_TXWINSIZE 4
#define H5_ACK_TIMEOUT msecs_to_jiffies(250)
struct h5 { struct h5 {
struct sk_buff_head unack; /* Unack'ed packets queue */ struct sk_buff_head unack; /* Unack'ed packets queue */
struct sk_buff_head rel; /* Reliable packets queue */ struct sk_buff_head rel; /* Reliable packets queue */
@ -37,11 +41,34 @@ struct h5 {
struct sk_buff *rx_skb; struct sk_buff *rx_skb;
struct timer_list timer; /* Retransmission timer */
bool txack_req; bool txack_req;
u8 msgq_txseq; u8 msgq_txseq;
}; };
static void h5_timed_event(unsigned long arg)
{
struct hci_uart *hu = (struct hci_uart *) arg;
struct h5 *h5 = hu->priv;
struct sk_buff *skb;
unsigned long flags;
BT_DBG("hu %p retransmitting %u pkts", hu, h5->unack.qlen);
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
while ((skb = __skb_dequeue_tail(&h5->unack)) != NULL) {
h5->msgq_txseq = (h5->msgq_txseq - 1) & 0x07;
skb_queue_head(&h5->rel, skb);
}
spin_unlock_irqrestore(&h5->unack.lock, flags);
hci_uart_tx_wakeup(hu);
}
static int h5_open(struct hci_uart *hu) static int h5_open(struct hci_uart *hu)
{ {
struct h5 *h5; struct h5 *h5;
@ -58,6 +85,10 @@ static int h5_open(struct hci_uart *hu)
skb_queue_head_init(&h5->rel); skb_queue_head_init(&h5->rel);
skb_queue_head_init(&h5->unrel); skb_queue_head_init(&h5->unrel);
init_timer(&h5->timer);
h5->timer.function = h5_timed_event;
h5->timer.data = (unsigned long) hu;
return 0; return 0;
} }
@ -69,6 +100,8 @@ static int h5_close(struct hci_uart *hu)
skb_queue_purge(&h5->rel); skb_queue_purge(&h5->rel);
skb_queue_purge(&h5->unrel); skb_queue_purge(&h5->unrel);
del_timer(&h5->timer);
kfree(h5); kfree(h5);
return 0; return 0;
@ -123,6 +156,7 @@ static struct sk_buff *h5_prepare_ack(struct h5 *h5)
static struct sk_buff *h5_dequeue(struct hci_uart *hu) static struct sk_buff *h5_dequeue(struct hci_uart *hu)
{ {
struct h5 *h5 = hu->priv; struct h5 *h5 = hu->priv;
unsigned long flags;
struct sk_buff *skb, *nskb; struct sk_buff *skb, *nskb;
if ((skb = skb_dequeue(&h5->unrel)) != NULL) { if ((skb = skb_dequeue(&h5->unrel)) != NULL) {
@ -136,6 +170,28 @@ static struct sk_buff *h5_dequeue(struct hci_uart *hu)
BT_ERR("Could not dequeue pkt because alloc_skb failed"); BT_ERR("Could not dequeue pkt because alloc_skb failed");
} }
spin_lock_irqsave_nested(&h5->unack.lock, flags, SINGLE_DEPTH_NESTING);
if (h5->unack.qlen >= H5_TXWINSIZE)
goto unlock;
if ((skb = skb_dequeue(&h5->rel)) != NULL) {
nskb = h5_prepare_pkt(h5, skb);
if (nskb) {
__skb_queue_tail(&h5->unack, skb);
mod_timer(&h5->timer, jiffies + H5_ACK_TIMEOUT);
spin_unlock_irqrestore(&h5->unack.lock, flags);
return nskb;
}
skb_queue_head(&h5->rel, skb);
BT_ERR("Could not dequeue pkt because alloc_skb failed");
}
unlock:
spin_unlock_irqrestore(&h5->unack.lock, flags);
if (h5->txack_req) if (h5->txack_req)
return h5_prepare_ack(h5); return h5_prepare_ack(h5);