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rxrpc: Trace discarded ACKs

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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>
This commit is contained in:
David Howells
2020-04-28 22:06:54 +01:00
parent c410bf0193
commit d1f129470e
2 changed files with 45 additions and 2 deletions
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12
net/rxrpc/input.c
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@@ -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;