linux-kernel - Re: [PATCH] net: tcp_drop adds `reason` and SNMP parameters for tracing v4

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Message-ID: <CAM_iQpVB97-t+J+zEF5xzLi07+YPK6O+Ph-NyTxAHV-2=cY93Q@mail.gmail.com>
Date:   Mon, 20 Sep 2021 09:58:50 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Zhongya Yan <yan2228598786@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, hengqi.chen@...il.com,
        Yonghong Song <yhs@...com>,
        Brendan Gregg <brendan.d.gregg@...il.com>,
        Zhongya Yan <2228598786@...com>
Subject: Re: [PATCH] net: tcp_drop adds `reason` and SNMP parameters for
 tracing v4

On Sat, Sep 4, 2021 at 7:51 PM Zhongya Yan <yan2228598786@...il.com> wrote:
> Thanks for the tip!
> See reason:https://github.com/iovisor/bcc/issues/3533

This link only explains why TCP needs it, my question is why not
do it for other protocols too, therefore neither this link nor you
answers it.

BTW, net/core/drop_monitor.c is based on kfree_skb() tracepoint
too, in case you are only interested in tracepoints not other things.

Thanks.