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NFC: Requeue lost LLCP frames 

When receiving an I or RR frame telling us that some of the pending queues
were not received, we should requeue them before the currently pending ones.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-05-30 17:48:29 +02:00
parent 6fbbdc16be
commit 8445796038
1 changed files with 55 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
net/nfc/llcp/llcp.c
View File

@ -411,28 +411,6 @@ int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
local->remote_gb_len - 3);
}
static void nfc_llcp_tx_work(struct work_struct *work)
{
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
tx_work);
struct sk_buff *skb;
skb = skb_dequeue(&local->tx_queue);
if (skb != NULL) {
pr_debug("Sending pending skb\n");
print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET,
16, 1, skb->data, skb->len, true);
nfc_data_exchange(local->dev, local->target_idx,
skb, nfc_llcp_recv, local);
} else {
nfc_llcp_send_symm(local->dev);
}
mod_timer(&local->link_timer,
jiffies + msecs_to_jiffies(local->remote_lto));
}
static u8 nfc_llcp_dsap(struct sk_buff *pdu)
{
return (pdu->data[0] & 0xfc) >> 2;
@ -465,6 +443,45 @@ static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
sock->recv_ack_n = (sock->recv_n - 1) % 16;
}
static void nfc_llcp_tx_work(struct work_struct *work)
{
struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
tx_work);
struct sk_buff *skb;
struct sock *sk;
struct nfc_llcp_sock *llcp_sock;
skb = skb_dequeue(&local->tx_queue);
if (skb != NULL) {
sk = skb->sk;
llcp_sock = nfc_llcp_sock(sk);
if (llcp_sock != NULL) {
int ret;
pr_debug("Sending pending skb\n");
print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
DUMP_PREFIX_OFFSET, 16, 1,
skb->data, skb->len, true);
ret = nfc_data_exchange(local->dev, local->target_idx,
skb, nfc_llcp_recv, local);
if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
skb = skb_get(skb);
skb_queue_tail(&llcp_sock->tx_pending_queue,
skb);
}
} else {
nfc_llcp_send_symm(local->dev);
}
} else {
nfc_llcp_send_symm(local->dev);
}
mod_timer(&local->link_timer,
jiffies + msecs_to_jiffies(2 * local->remote_lto));
}
static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
u8 ssap)
{
@ -705,7 +722,7 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
/* Try to queue some I frames for transmission */
while (sock->remote_ready &&
skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
struct sk_buff *pdu, *pending_pdu;
struct sk_buff *pdu;
pdu = skb_dequeue(&sock->tx_queue);
if (pdu == NULL)
@ -714,10 +731,7 @@ int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
/* Update N(S)/N(R) */
nfc_llcp_set_nrns(sock, pdu);
pending_pdu = skb_clone(pdu, GFP_KERNEL);
skb_queue_tail(&local->tx_queue, pdu);
skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
nr_frames++;
}
@ -774,11 +788,21 @@ static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
llcp_sock->send_ack_n = nr;
skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
if (nfc_llcp_ns(s) <= nr) {
skb_unlink(s, &llcp_sock->tx_pending_queue);
kfree_skb(s);
}
/* Remove and free all skbs until ns == nr */
skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
skb_unlink(s, &llcp_sock->tx_pending_queue);
kfree_skb(s);
if (nfc_llcp_ns(s) == nr)
break;
}
/* Re-queue the remaining skbs for transmission */
skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
s, tmp) {
skb_unlink(s, &llcp_sock->tx_pending_queue);
skb_queue_head(&local->tx_queue, s);
}
}
if (ptype == LLCP_PDU_RR)