From 7aa51da7c88d42cc0bb85ab7d01429fbd4e51282 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 22 Sep 2016 00:29:31 +0100 Subject: rxrpc: Expedite ping response transmission Expedite the transmission of a response to a PING ACK by sending it from sendmsg if one is pending. We're most likely to see a PING ACK during the client call Tx phase as the other side may use it to determine a number of parameters, such as the client's receive window size, the RTT and whether the client is doing slow start (similar to RFC5681). If we don't expedite it, it's left to the background processing thread to transmit. Signed-off-by: David Howells --- net/rxrpc/sendmsg.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c index 814b17f23971..3c969de3ef05 100644 --- a/net/rxrpc/sendmsg.c +++ b/net/rxrpc/sendmsg.c @@ -180,6 +180,10 @@ static int rxrpc_send_data(struct rxrpc_sock *rx, copied = 0; do { + /* Check to see if there's a ping ACK to reply to. */ + if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) + rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK); + if (!skb) { size_t size, chunk, max, space; -- cgit v1.2.3-58-ga151