netdev - Re: [PATCH] net: tracepoint: exposing sk

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Message-ID: <CANn89i+ZggZvj_bEo7Jd+Ac=kiE9SZGxJ7JQ=NVTHCkM97jE6g@mail.gmail.com>
Date:   Tue, 2 Feb 2021 08:38:55 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Hariharan Ananthakrishnan <hari@...flix.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Brendan Gregg <bgregg@...flix.com>
Subject: Re: [PATCH] net: tracepoint: exposing sk_family in all tcp:tracepoints

On Mon, Feb 1, 2021 at 11:06 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 29 Jan 2021 00:12:10 +0000 Hariharan Ananthakrishnan wrote:
> > Similar to sock:inet_sock_set_state tracepoint, expose sk_family to
> > distinguish AF_INET and AF_INET6 families.
> >
> > The following tcp tracepoints are updated:
> > tcp:tcp_destroy_sock
> > tcp:tcp_rcv_space_adjust
> > tcp:tcp_retransmit_skb
> > tcp:tcp_send_reset
> > tcp:tcp_receive_reset
> > tcp:tcp_retransmit_synack
> > tcp:tcp_probe
> >
> > Signed-off-by: Hariharan Ananthakrishnan <hari@...flix.com>
> > Signed-off-by: Brendan Gregg <bgregg@...flix.com>
>
> Eric, any thoughts?


I do not use these tracepoints in production scripts, but I wonder if
existing tools could break after this change ?

Or do we consider tracepoints format is not part of the ABI and can be
arbitrarily changed by anyone ?