diff options
| author |   Samuel Ortiz <sameo@linux.intel.com> | 2012-11-01 23:33:00 +0100 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2012-11-19 23:57:00 +0100 |
| commit | dd2bf43ffcf0d1bba94d20abc6cc44ed294db66b (patch) | |
| tree | 8798f1c8c66330e0a2c5f327212e764fdc51a92d /net/nfc | |
| parent | NFC: Copy user space buffer when sending UI frames (diff) | |
| download | linux-dev-dd2bf43ffcf0d1bba94d20abc6cc44ed294db66b.tar.xz linux-dev-dd2bf43ffcf0d1bba94d20abc6cc44ed294db66b.zip | |
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>
Diffstat (limited to 'net/nfc')
| -rw-r--r-- | net/nfc/llcp/commands.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/nfc/llcp/commands.c b/net/nfc/llcp/commands.c index f0a39456f26b..df24be48d4da 100644 --- a/net/nfc/llcp/commands.c +++ b/net/nfc/llcp/commands.c @@ -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; |