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tcp: expose sk_state in tcp_retransmit_skb tracepoint

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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>
This commit is contained in:
Yafang Shao 2018-09-24 20:57:29 +08:00 committed by David S. Miller
parent 0a71515665
commit af4325ecc2
1 changed files with 5 additions and 2 deletions
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7
include/trace/events/tcp.h
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@ -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,