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

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Message-ID: <CADxym3b0COE3c8J8Qb6B61OZySzyZevrE2WDBWFBHOKuDjJ9hg@mail.gmail.com>
Date:   Fri, 11 Feb 2022 16:53:25 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, David Ahern <dsahern@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Menglong Dong <imagedong@...cent.com>,
        Alexander Lobakin <alobakin@...me>, paulb@...dia.com,
        Kees Cook <keescook@...omium.org>,
        Talal Ahmad <talalahmad@...gle.com>,
        Kevin Hao <haokexin@...il.com>,
        Kumar Kartikeya Dwivedi <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 12:29 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Thu, Feb 10, 2022 at 8:13 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.
>
> I had a similar TODO item, because stuff like 'waking up task' or free
> one skb (or list of skb) could be performed outside of socket lock.

May I ask what it's like? Is it used to solve this kind of problem?

Thanks!
Menglong Dong