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296f7ea75b
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>
32 lines
593 B
C
32 lines
593 B
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM udp
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#if !defined(_TRACE_UDP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_UDP_H
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#include <linux/udp.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(udp_fail_queue_rcv_skb,
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TP_PROTO(int rc, struct sock *sk),
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TP_ARGS(rc, sk),
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TP_STRUCT__entry(
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__field(int, rc)
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__field(__u16, lport)
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),
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TP_fast_assign(
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__entry->rc = rc;
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__entry->lport = inet_sk(sk)->inet_num;
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),
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TP_printk("rc=%d port=%hu", __entry->rc, __entry->lport)
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);
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#endif /* _TRACE_UDP_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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