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Commit dd2bf43f authored by Samuel Ortiz's avatar Samuel Ortiz
Browse files

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: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 6e950fd2

net/nfc/llcp/commands.c

+17 −0
Original line number Diff line number Diff line
@@ -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;