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rxrpc: Fix RTT determination to use any ACK as a source 

Fix RTT determination to be able to use any type of ACK as the response
from which RTT can be calculated provided its ack.serial is non-zero and
matches the serial number of an outgoing DATA or ACK packet.  This
shouldn't be limited to REQUESTED-type ACKs as these can have other types
substituted for them for things like duplicate or out-of-order packets.

Fixes: 4700c4d80b ("rxrpc: Fix loss of RTT samples due to interposed ACK")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: "David S. Miller" <davem@davemloft.net>
cc: Eric Dumazet <edumazet@google.com>
cc: Jakub Kicinski <kuba@kernel.org>
cc: Paolo Abeni <pabeni@redhat.com>
cc: linux-afs@lists.infradead.org
cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells 2023-11-16 13:12:58 +00:00 committed by David S. Miller
parent 75a50c4f5b
commit 3798680f2f
2 changed files with 17 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/trace/events/rxrpc.h
View File

@ -328,7 +328,7 @@
E_(rxrpc_rtt_tx_ping, "PING")
#define rxrpc_rtt_rx_traces \
EM(rxrpc_rtt_rx_cancel, "CNCL") \
EM(rxrpc_rtt_rx_other_ack, "OACK") \
EM(rxrpc_rtt_rx_obsolete, "OBSL") \
EM(rxrpc_rtt_rx_lost, "LOST") \
EM(rxrpc_rtt_rx_ping_response, "PONG") \

35
net/rxrpc/input.c
View File

@ -643,12 +643,8 @@ static void rxrpc_complete_rtt_probe(struct rxrpc_call *call,
clear_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail);
smp_mb(); /* Read data before setting avail bit */
set_bit(i, &call->rtt_avail);
if (type != rxrpc_rtt_rx_cancel)
rxrpc_peer_add_rtt(call, type, i, acked_serial, ack_serial,
sent_at, resp_time);
else
trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_cancel, i,
orig_serial, acked_serial, 0, 0);
rxrpc_peer_add_rtt(call, type, i, acked_serial, ack_serial,
sent_at, resp_time);
matched = true;
}
@ -801,20 +797,21 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
summary.ack_reason, nr_acks);
rxrpc_inc_stat(call->rxnet, stat_rx_acks[ack.reason]);
switch (ack.reason) {
case RXRPC_ACK_PING_RESPONSE:
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_ping_response);
break;
case RXRPC_ACK_REQUESTED:
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_requested_ack);
break;
default:
if (acked_serial != 0)
if (acked_serial != 0) {
switch (ack.reason) {
case RXRPC_ACK_PING_RESPONSE:
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_cancel);
break;
rxrpc_rtt_rx_ping_response);
break;
case RXRPC_ACK_REQUESTED:
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_requested_ack);
break;
default:
rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial,
rxrpc_rtt_rx_other_ack);
break;
}
}
if (ack.reason == RXRPC_ACK_PING) {