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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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35
include/trace/events/rxrpc.h
View file

@ -1541,6 +1541,41 @@ TRACE_EVENT(rxrpc_notify_socket,
__entry->serial)
);
TRACE_EVENT(rxrpc_rx_discard_ack,
TP_PROTO(unsigned int debug_id, rxrpc_serial_t serial,
rxrpc_seq_t first_soft_ack, rxrpc_seq_t call_ackr_first,
rxrpc_seq_t prev_pkt, rxrpc_seq_t call_ackr_prev),
TP_ARGS(debug_id, serial, first_soft_ack, call_ackr_first,
prev_pkt, call_ackr_prev),
TP_STRUCT__entry(
__field(unsigned int, debug_id )
__field(rxrpc_serial_t, serial )
__field(rxrpc_seq_t, first_soft_ack)
__field(rxrpc_seq_t, call_ackr_first)
__field(rxrpc_seq_t, prev_pkt)
__field(rxrpc_seq_t, call_ackr_prev)
),
TP_fast_assign(
__entry->debug_id = debug_id;
__entry->serial = serial;
__entry->first_soft_ack = first_soft_ack;
__entry->call_ackr_first = call_ackr_first;
__entry->prev_pkt = prev_pkt;
__entry->call_ackr_prev = call_ackr_prev;
),
TP_printk("c=%08x r=%08x %08x<%08x %08x<%08x",
__entry->debug_id,
__entry->serial,
__entry->first_soft_ack,
__entry->call_ackr_first,
__entry->prev_pkt,
__entry->call_ackr_prev)
);
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */

12
net/rxrpc/input.c
View file

@ -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;