linux/include/trace/events/udp.h
Satoru Moriya 296f7ea75b udp: add tracepoints for queueing skb to rcvbuf
This patch adds a tracepoint to __udp_queue_rcv_skb to get the
return value of ip_queue_rcv_skb. It indicates why kernel drops
a packet at this point.

ip_queue_rcv_skb returns following values in the packet drop case:

rcvbuf is full                 : -ENOMEM
sk_filter returns error        : -EINVAL, -EACCESS, -ENOMEM, etc.
__sk_mem_schedule returns error: -ENOBUF

Signed-off-by: Satoru Moriya <satoru.moriya@hds.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-06-21 16:06:10 -07:00

32 lines
593 B
C

#undef TRACE_SYSTEM
#define TRACE_SYSTEM udp
#if !defined(_TRACE_UDP_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_UDP_H
#include <linux/udp.h>
#include <linux/tracepoint.h>
TRACE_EVENT(udp_fail_queue_rcv_skb,
TP_PROTO(int rc, struct sock *sk),
TP_ARGS(rc, sk),
TP_STRUCT__entry(
__field(int, rc)
__field(__u16, lport)
),
TP_fast_assign(
__entry->rc = rc;
__entry->lport = inet_sk(sk)->inet_num;
),
TP_printk("rc=%d port=%hu", __entry->rc, __entry->lport)
);
#endif /* _TRACE_UDP_H */
/* This part must be outside protection */
#include <trace/define_trace.h>