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authorDavid Howells <dhowells@redhat.com>2020-04-29 00:06:54 +0300
committerDavid Howells <dhowells@redhat.com>2020-05-20 17:33:41 +0300
commitd1f129470e6cb79b8b97fecd12689f6eb49e27fe (patch)
tree99ec5401d87696e41505fc1e0fdf9d6e010d5d9e /net/rxrpc/input.c
parentc410bf01933e5e09d142c66c3df9ad470a7eec13 (diff)
downloadlinux-d1f129470e6cb79b8b97fecd12689f6eb49e27fe.tar.xz
rxrpc: Trace discarded ACKs
Add a tracepoint to track received ACKs that are discarded due to being outside of the Tx window. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/input.c')
-rw-r--r--net/rxrpc/input.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index e438bfd3fdf5..2f22f082a66c 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -866,8 +866,12 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
/* Discard any out-of-order or duplicate ACKs (outside lock). */
if (before(first_soft_ack, call->ackr_first_seq) ||
- before(prev_pkt, call->ackr_prev_seq))
+ before(prev_pkt, call->ackr_prev_seq)) {
+ trace_rxrpc_rx_discard_ack(call->debug_id, sp->hdr.serial,
+ first_soft_ack, call->ackr_first_seq,
+ prev_pkt, call->ackr_prev_seq);
return;
+ }
buf.info.rxMTU = 0;
ioffset = offset + nr_acks + 3;
@@ -879,8 +883,12 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
/* Discard any out-of-order or duplicate ACKs (inside lock). */
if (before(first_soft_ack, call->ackr_first_seq) ||
- before(prev_pkt, call->ackr_prev_seq))
+ before(prev_pkt, call->ackr_prev_seq)) {
+ trace_rxrpc_rx_discard_ack(call->debug_id, sp->hdr.serial,
+ first_soft_ack, call->ackr_first_seq,
+ prev_pkt, call->ackr_prev_seq);
goto out;
+ }
call->acks_latest_ts = skb->tstamp;
call->ackr_first_seq = first_soft_ack;