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rxrpc: Add a tracepoint to log injected Rx packet loss

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Add a tracepoint to log received packets that get discarded due to Rx
packet loss.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-09-23 12:39:22 +01:00
parent be832aecc5
commit 89b475abdb
2 changed files with 26 additions and 6 deletions
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21
include/trace/events/rxrpc.h
View file

@ -484,6 +484,27 @@ TRACE_EVENT(rxrpc_timer,
__entry->timer - __entry->now)
);
TRACE_EVENT(rxrpc_rx_lose,
TP_PROTO(struct rxrpc_skb_priv *sp),
TP_ARGS(sp),
TP_STRUCT__entry(
__field_struct(struct rxrpc_host_header, hdr )
),
TP_fast_assign(
memcpy(&__entry->hdr, &sp->hdr, sizeof(__entry->hdr));
),
TP_printk("%08x:%08x:%08x:%04x %08x %08x %02x %02x %s *LOSE*",
__entry->hdr.epoch, __entry->hdr.cid,
__entry->hdr.callNumber, __entry->hdr.serviceId,
__entry->hdr.serial, __entry->hdr.seq,
__entry->hdr.type, __entry->hdr.flags,
__entry->hdr.type <= 15 ? rxrpc_pkts[__entry->hdr.type] : "?UNK")
);
#endif /* _TRACE_RXRPC_H */
/* This part must be outside protection */

11
net/rxrpc/input.c
View file

@ -837,20 +837,19 @@ void rxrpc_data_ready(struct sock *udp_sk)
skb_orphan(skb);
sp = rxrpc_skb(skb);
/* dig out the RxRPC connection details */
if (rxrpc_extract_header(sp, skb) < 0)
goto bad_message;
if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
static int lose;
if ((lose++ & 7) == 7) {
trace_rxrpc_rx_lose(sp);
rxrpc_lose_skb(skb, rxrpc_skb_rx_lost);
return;
}
}
_net("Rx UDP packet from %08x:%04hu",
ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source));
/* dig out the RxRPC connection details */
if (rxrpc_extract_header(sp, skb) < 0)
goto bad_message;
trace_rxrpc_rx_packet(sp);
_net("Rx RxRPC %s ep=%x call=%x:%x",