[Patch net-next 04/13] udp: introduce tracepoint trace_udp_send_skb()
From: Cong Wang <hidden>
Date: 2021-08-05 18:58:04
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
From: Qitao Xu <redacted> Tracepoint trace_udp_send_skb() is introduced to trace skb at the exit of UDP layer on TX side. Reviewed-by: Cong Wang <redacted> Signed-off-by: Qitao Xu <redacted> --- include/trace/events/udp.h | 19 +++++++++++++++++++ net/ipv4/udp.c | 4 +++- 2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/include/trace/events/udp.h b/include/trace/events/udp.h
index 336fe272889f..7babc1a11693 100644
--- a/include/trace/events/udp.h
+++ b/include/trace/events/udp.h@@ -27,6 +27,25 @@ TRACE_EVENT(udp_fail_queue_rcv_skb, TP_printk("rc=%d port=%hu", __entry->rc, __entry->lport) ); +TRACE_EVENT(udp_send_skb, + + TP_PROTO(const struct sock *sk, const struct sk_buff *skb), + + TP_ARGS(sk, skb), + + TP_STRUCT__entry( + __field(const void *, skaddr) + __field(const void *, skbaddr) + ), + + TP_fast_assign( + __entry->skaddr = sk; + __entry->skbaddr = skb; + ), + + TP_printk("skaddr=%px, skbaddr=%px", __entry->skaddr, __entry->skbaddr) +); + #endif /* _TRACE_UDP_H */ /* This part must be outside protection */
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 1a742b710e54..daa618465a1d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c@@ -970,9 +970,11 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4, UDP_MIB_SNDBUFERRORS, is_udplite); err = 0; } - } else + } else { UDP_INC_STATS(sock_net(sk), UDP_MIB_OUTDATAGRAMS, is_udplite); + trace_udp_send_skb(sk, skb); + } return err; }
--
2.27.0