netdev - Re: [PATCH net-next 3/6] net: ipv4: use kfree_skb_reason() in ip_rcv_finish

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Message-ID: <CADxym3Y5Ld-BcM4-Y=vJZiwsCEfRZpBqd1oj6ct+Xeu8F=wXew@mail.gmail.com>
Date:   Wed, 26 Jan 2022 11:13:35 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>, mingo@...hat.com,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.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, Paolo Abeni <pabeni@...hat.com>,
        talalahmad@...gle.com, haokexin@...il.com,
        Kees Cook <keescook@...omium.org>, 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 net-next 3/6] net: ipv4: use kfree_skb_reason() in ip_rcv_finish_core()

On Wed, Jan 26, 2022 at 10:57 AM David Ahern <dsahern@...il.com> wrote:
>
> On 1/25/22 7:36 PM, Menglong Dong wrote:
> > Is't it meaningful? I name it from the meaning of 'ip route lookup or validate
> > failed in input path', can't it express this information?
>
>
> ip_route_input_noref has many failures and not all of them are FIB
> lookups. ip_route_input_slow has a bunch of EINVAL cases for example.
>
> Returning a 'reason' as the code function name has no meaning to a user
> and could actually be misleading in some cases. I would skip this one
> for now.

Yeah, the real reason can be complex. I'll skip this case for now.