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 <dhowells@redhat.com>

diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 1a700b6..b1e697f 100644 (file)
--- 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 d5bf9ce..05b94d1 100644 (file)
--- 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 dd69966..0344f44 100644 (file)
--- 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 901c012..a608769 100644 (file)
--- 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",