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Date: Thu, 5 Aug 2021 11:57:46 -0700 From: Cong Wang <xiyou.wangcong@...il.com> To: netdev@...r.kernel.org Cc: Qitao Xu <qitao.xu@...edance.com>, Cong Wang <cong.wang@...edance.com> Subject: [Patch net-next 09/13] udp: introduce tracepoint trace_udp_rcv() From: Qitao Xu <qitao.xu@...edance.com> Tracepoint trace_udp_rcv() is introduced to trace skb at the entrance of UDP layer on RX side. Reviewed-by: Cong Wang <cong.wang@...edance.com> Signed-off-by: Qitao Xu <qitao.xu@...edance.com> --- 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) -- 2.27.0
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