6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Howells <dhowells@xxxxxxxxxx>
[ Upstream commit 3798680f2fbbe0ca3ab6138b34e0d161c36497ee ]
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: 4700c4d80b7b ("rxrpc: Fix loss of RTT samples due to interposed ACK")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
cc: Eric Dumazet <edumazet@xxxxxxxxxx>
cc: Jakub Kicinski <kuba@xxxxxxxxxx>
cc: Paolo Abeni <pabeni@xxxxxxxxxx>
cc: linux-afs@xxxxxxxxxxxxxxxxxxx
cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/trace/events/rxrpc.h | 2 +-
net/rxrpc/input.c | 35 ++++++++++++++++-------------------
2 files changed, 17 insertions(+), 20 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 4c53a5ef6257b..f7e537f64db45 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -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") \
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 030d64f282f37..3f9594d125192 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -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) {
--
2.42.0
