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tcp: use data length instead of skb->len in tcp_probe

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skb->len is meaningless to user.
data length could be more helpful, with which we can easily filter out
the packet without payload.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yafang Shao 2018-05-25 18:14:05 +08:00 committed by David S. Miller
parent 06c14de5a2
commit 2d68c0745a
1 changed files with 4 additions and 4 deletions
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8
include/trace/events/tcp.h
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@ -236,7 +236,7 @@ TRACE_EVENT(tcp_probe,
__field(__u16, sport)
__field(__u16, dport)
__field(__u32, mark)
__field(__u16, length)
__field(__u16, data_len)
__field(__u32, snd_nxt)
__field(__u32, snd_una)
__field(__u32, snd_cwnd)
@ -261,7 +261,7 @@ TRACE_EVENT(tcp_probe,
__entry->dport = ntohs(inet->inet_dport);
__entry->mark = skb->mark;
__entry->length = skb->len;
__entry->data_len = skb->len - tcp_hdrlen(skb);
__entry->snd_nxt = tp->snd_nxt;
__entry->snd_una = tp->snd_una;
__entry->snd_cwnd = tp->snd_cwnd;
@ -272,9 +272,9 @@ TRACE_EVENT(tcp_probe,
__entry->sock_cookie = sock_gen_cookie(sk);
),
TP_printk("src=%pISpc dest=%pISpc mark=%#x length=%d snd_nxt=%#x snd_una=%#x snd_cwnd=%u ssthresh=%u snd_wnd=%u srtt=%u rcv_wnd=%u sock_cookie=%llx",
TP_printk("src=%pISpc dest=%pISpc mark=%#x data_len=%d snd_nxt=%#x snd_una=%#x snd_cwnd=%u ssthresh=%u snd_wnd=%u srtt=%u rcv_wnd=%u sock_cookie=%llx",
__entry->saddr, __entry->daddr, __entry->mark,
__entry->length, __entry->snd_nxt, __entry->snd_una,
__entry->data_len, __entry->snd_nxt, __entry->snd_una,
__entry->snd_cwnd, __entry->ssthresh, __entry->snd_wnd,
__entry->srtt, __entry->rcv_wnd, __entry->sock_cookie)
);