linux-kernel - Re: [PATCH v3 net-next 1/7] net: skb_drop_reason: add document for drop reasons

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Message-ID: <CADxym3b-D-08P_YzQSSP-YdrTcw981MRyAmxNcXrdorWYcJniQ@mail.gmail.com>
Date:   Fri, 11 Feb 2022 16:49:50 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Ahern <dsahern@...il.com>, David Ahern <dsahern@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>, mingo@...hat.com,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        pablo@...filter.org, kadlec@...filter.org,
        Florian Westphal <fw@...len.de>,
        Menglong Dong <imagedong@...cent.com>,
        Eric Dumazet <edumazet@...gle.com>, alobakin@...me,
        paulb@...dia.com, Kees Cook <keescook@...omium.org>,
        talalahmad@...gle.com, haokexin@...il.com, memxor@...il.com,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH v3 net-next 1/7] net: skb_drop_reason: add document for
 drop reasons

On Fri, Feb 11, 2022 at 12:13 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Thu, 10 Feb 2022 21:42:14 +0800 Menglong Dong wrote:
> > How about introducing a field to 'struct sock' for drop reasons? As sk is
> > locked during the packet process in tcp_v4_do_rcv(), this seems to work.
>
> I find adding temporary storage to persistent data structures awkward.
> You can put a structure on the stack and pass it thru the call chain,
> that's just my subjective preference, tho, others may have better ideas.

Yes, I also feel it is awkward. I'll try to do this job by passing drop reasons
through the call chain. Thanks for your help :)