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authorYafang Shao <laoar.shao@gmail.com>2018-09-24 15:57:29 +0300
committerDavid S. Miller <davem@davemloft.net>2018-09-27 06:07:19 +0300
commitaf4325ecc24f45933d5567e72227cff2c1594764 (patch)
treeb63e4f7ea1df4325cdc4292709371498d1ebefb8 /include
parent0a715156656bddf4aa92d9868f850aeeb0465fd0 (diff)
downloadlinux-af4325ecc24f45933d5567e72227cff2c1594764.tar.xz
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 <laoar.shao@gmail.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/tcp.h7
1 files 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,