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NFC: Stop sending LLCP frames when tx queues are getting too deep 

When the tx pending queues and/or the socket tx queue is getting too deep,
we have to let userspace know. We won't be queueing any more frames until
the congestion is fixed.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-11-01 23:33:00 +01:00
parent 6e950fd214
commit dd2bf43ffc
1 changed files with 17 additions and 0 deletions
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17
net/nfc/llcp/commands.c
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@ -528,6 +528,23 @@ int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
if (local == NULL)
return -ENODEV;
/* Remote is ready but has not acknowledged our frames */
if((sock->remote_ready &&
skb_queue_len(&sock->tx_pending_queue) >= sock->rw &&
skb_queue_len(&sock->tx_queue) >= 2 * sock->rw)) {
pr_err("Pending queue is full %d frames\n",
skb_queue_len(&sock->tx_pending_queue));
return -ENOBUFS;
}
/* Remote is not ready and we've been queueing enough frames */
if ((!sock->remote_ready &&
skb_queue_len(&sock->tx_queue) >= 2 * sock->rw)) {
pr_err("Tx queue is full %d frames\n",
skb_queue_len(&sock->tx_queue));
return -ENOBUFS;
}
msg_data = kzalloc(len, GFP_KERNEL);
if (msg_data == NULL)
return -ENOMEM;