> On May 24, 2018, at 5:48 AM, Yafang Shao <laoar.s...@gmail.com> wrote:
>
> 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.s...@gmail.com>
> ---
> include/trace/events/tcp.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
> index c1a5284..259b991 100644
> --- a/include/trace/events/tcp.h
> +++ b/include/trace/events/tcp.h
> @@ -261,7 +261,7 @@
> __entry->dport = ntohs(inet->inet_dport);
> __entry->mark = skb->mark;
>
> - __entry->length = skb->len;
> + __entry->length = skb->len - tcp_hdrlen(skb);
We should also rename __entry->length to __entry->data_len, so that whoever
using this field will notice the change.
Thanks,
Song
> __entry->snd_nxt = tp->snd_nxt;
> __entry->snd_una = tp->snd_una;
> __entry->snd_cwnd = tp->snd_cwnd;
> @@ -272,7 +272,7 @@
> __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->snd_cwnd, __entry->ssthresh, __entry->snd_wnd,
> --
> 1.8.3.1
>
