From 805b21b929e29192fb5de16154f616bfc1116e3e Mon Sep 17 00:00:00 2001 From: David Howells Date: Sat, 24 Sep 2016 18:05:26 +0100 Subject: rxrpc: Send an ACK after every few DATA packets we receive Send an ACK if we haven't sent one for the last two packets we've received. This keeps the other end apprised of where we've got to - which is important if they're doing slow-start. We do this in recvmsg so that we can dispatch a packet directly without the need to wake up the background thread. This should possibly be made configurable in future. Signed-off-by: David Howells --- net/rxrpc/recvmsg.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'net/rxrpc/recvmsg.c') diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c index 8c7f3de45bac..a7458c398b9e 100644 --- a/net/rxrpc/recvmsg.c +++ b/net/rxrpc/recvmsg.c @@ -201,8 +201,19 @@ static void rxrpc_rotate_rx_window(struct rxrpc_call *call) _debug("%u,%u,%02x", hard_ack, top, flags); trace_rxrpc_receive(call, rxrpc_receive_rotate, serial, hard_ack); - if (flags & RXRPC_LAST_PACKET) + if (flags & RXRPC_LAST_PACKET) { rxrpc_end_rx_phase(call); + } else { + /* Check to see if there's an ACK that needs sending. */ + if (after_eq(hard_ack, call->ackr_consumed + 2) || + after_eq(top, call->ackr_seen + 2) || + (hard_ack == top && after(hard_ack, call->ackr_consumed))) + rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, 0, serial, + true, false, + rxrpc_propose_ack_rotate_rx); + if (call->ackr_reason) + rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK); + } } /* -- cgit v1.2.3