From 0d967960d39ee89f9e0289692e9f7232f490e55c Mon Sep 17 00:00:00 2001 From: David Howells Date: Sat, 24 Sep 2016 18:05:27 +0100 Subject: [PATCH] rxrpc: Schedule an ACK if the reply to a client call appears overdue If we've sent all the request data in a client call but haven't seen any sign of the reply data yet, schedule an ACK to be sent to the server to find out if the reply data got lost. If the server hasn't yet hard-ACK'd the request data, we send a PING ACK to demand a response to find out whether we need to retransmit. If the server says it has received all of the data, we send an IDLE ACK to tell the server that we haven't received anything in the receive phase as yet. To make this work, a non-immediate PING ACK must carry a delay. I've chosen the same as the IDLE ACK for the moment. Signed-off-by: David Howells --- net/rxrpc/ar-internal.h | 2 ++ net/rxrpc/call_event.c | 1 + net/rxrpc/input.c | 8 ++++++++ net/rxrpc/misc.c | 2 ++ 4 files changed, 13 insertions(+) diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index 1a700b6a998b..b1e697fc9ffb 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -707,7 +707,9 @@ enum rxrpc_timer_trace { extern const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8]; enum rxrpc_propose_ack_trace { + rxrpc_propose_ack_client_tx_end, rxrpc_propose_ack_input_data, + rxrpc_propose_ack_ping_for_lost_reply, rxrpc_propose_ack_ping_for_params, rxrpc_propose_ack_respond_to_ack, rxrpc_propose_ack_respond_to_ping, diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c index d5bf9ce7ec6f..05b94d1acf52 100644 --- a/net/rxrpc/call_event.c +++ b/net/rxrpc/call_event.c @@ -100,6 +100,7 @@ static void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, expiry = rxrpc_soft_ack_delay; break; + case RXRPC_ACK_PING: case RXRPC_ACK_IDLE: if (rxrpc_idle_ack_delay < expiry) expiry = rxrpc_idle_ack_delay; diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c index dd699667eeef..0344f4494eb7 100644 --- a/net/rxrpc/input.c +++ b/net/rxrpc/input.c @@ -138,6 +138,8 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, write_unlock(&call->state_lock); if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) { + rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, false, true, + rxrpc_propose_ack_client_tx_end); trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); } else { trace_rxrpc_transmit(call, rxrpc_transmit_end); @@ -684,6 +686,12 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, return; } + if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & + RXRPC_TX_ANNO_LAST && + summary.nr_acks == call->tx_top - hard_ack) + rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial, + false, true, + rxrpc_propose_ack_ping_for_lost_reply); } /* diff --git a/net/rxrpc/misc.c b/net/rxrpc/misc.c index 901c012a2700..a608769343e6 100644 --- a/net/rxrpc/misc.c +++ b/net/rxrpc/misc.c @@ -198,7 +198,9 @@ const char rxrpc_timer_traces[rxrpc_timer__nr_trace][8] = { }; const char rxrpc_propose_ack_traces[rxrpc_propose_ack__nr_trace][8] = { + [rxrpc_propose_ack_client_tx_end] = "ClTxEnd", [rxrpc_propose_ack_input_data] = "DataIn ", + [rxrpc_propose_ack_ping_for_lost_reply] = "LostRpl", [rxrpc_propose_ack_ping_for_params] = "Params ", [rxrpc_propose_ack_respond_to_ack] = "Rsp2Ack", [rxrpc_propose_ack_respond_to_ping] = "Rsp2Png", -- 2.34.1