[Patch net-next 09/13] udp: introduce tracepoint trace_udp_rcv()
flat view
STALE1898d
REVIEWED: 1 (0M)
From: Cong Wang <hidden>
Date: 2021-08-05 18:58:11
Subsystem:
networking [general], the rest, tracing, user datagram protocol (udp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Steven Rostedt, Masami Hiramatsu, Willem de Bruijn
1 review trailer.
From: Qitao Xu <redacted> Tracepoint trace_udp_rcv() is introduced to trace skb at the entrance of UDP layer on RX side. Reviewed-by: Cong Wang <redacted> Signed-off-by: Qitao Xu <redacted> --- include/trace/events/udp.h | 17 +++++++++++++++++ net/ipv4/udp.c | 8 +++++++- 2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/include/trace/events/udp.h b/include/trace/events/udp.h
index 6af4b402237a..5008bdd546e8 100644
--- a/include/trace/events/udp.h
+++ b/include/trace/events/udp.h@@ -27,6 +27,23 @@ TRACE_EVENT(udp_fail_queue_rcv_skb, TP_printk("rc=%d port=%hu", __entry->rc, __entry->lport) ); +TRACE_EVENT(udp_rcv, + + TP_PROTO(const struct sk_buff *skb), + + TP_ARGS(skb), + + TP_STRUCT__entry( + __field(const void *, skbaddr) + ), + + TP_fast_assign( + __entry->skbaddr = skb; + ), + + TP_printk("skbaddr=%px", __entry->skbaddr) +); + TRACE_EVENT(udp_send_skb, TP_PROTO(const struct sock *sk, const struct sk_buff *skb),
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index daa618465a1d..4751a8f9acff 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c@@ -2617,7 +2617,13 @@ int udp_v4_early_demux(struct sk_buff *skb) int udp_rcv(struct sk_buff *skb) { - return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); + int ret; + + ret = __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); + if (!ret) + trace_udp_rcv(skb); + return ret; + } void udp_destroy_sock(struct sock *sk)
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2.27.0