From af4325ecc24f45933d5567e72227cff2c1594764 Mon Sep 17 00:00:00 2001 From: Yafang Shao Date: Mon, 24 Sep 2018 20:57:29 +0800 Subject: [PATCH] tcp: expose sk_state in tcp_retransmit_skb tracepoint After sk_state exposed, we can get in which state this retransmission occurs. That could give us more detail for dignostic. For example, if this retransmission occurs in SYN_SENT state, it may also indicates that the syn packet may be dropped on the remote peer due to syn backlog queue full and then we could check the remote peer. BTW,SYNACK retransmission is traced in tcp_retransmit_synack tracepoint. Signed-off-by: Yafang Shao Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/trace/events/tcp.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h index ac55b328d61b..2bc9960a31aa 100644 --- a/include/trace/events/tcp.h +++ b/include/trace/events/tcp.h @@ -56,6 +56,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb, TP_STRUCT__entry( __field(const void *, skbaddr) __field(const void *, skaddr) + __field(int, state) __field(__u16, sport) __field(__u16, dport) __array(__u8, saddr, 4) @@ -70,6 +71,7 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb, __entry->skbaddr = skb; __entry->skaddr = sk; + __entry->state = sk->sk_state; __entry->sport = ntohs(inet->inet_sport); __entry->dport = ntohs(inet->inet_dport); @@ -84,9 +86,10 @@ DECLARE_EVENT_CLASS(tcp_event_sk_skb, sk->sk_v6_rcv_saddr, sk->sk_v6_daddr); ), - TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c", + TP_printk("sport=%hu dport=%hu saddr=%pI4 daddr=%pI4 saddrv6=%pI6c daddrv6=%pI6c state=%s\n", __entry->sport, __entry->dport, __entry->saddr, __entry->daddr, - __entry->saddr_v6, __entry->daddr_v6) + __entry->saddr_v6, __entry->daddr_v6, + show_tcp_state_name(__entry->state)) ); DEFINE_EVENT(tcp_event_sk_skb, tcp_retransmit_skb, -- 2.30.2