From: David Howells dhowells@redhat.com
[ Upstream commit d1f129470e6cb79b8b97fecd12689f6eb49e27fe ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- include/trace/events/rxrpc.h | 35 +++++++++++++++++++++++++++++++++++ net/rxrpc/input.c | 12 ++++++++++-- 2 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h index ab75f261f04a..ba9efdc848f9 100644 --- a/include/trace/events/rxrpc.h +++ b/include/trace/events/rxrpc.h @@ -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 */ 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;