netdev - Re: [PATCH v2] sched: report if filter is too large to dump

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Message-ID: <CAM_iQpWhPxGO_=qHjxcrB0wCJetmh71w5o6wz2bEQkxYohQkLg@mail.gmail.com>
Date:   Tue, 20 Feb 2018 10:43:43 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Roman Kapl <code@...pl.cz>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>, Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCH v2] sched: report if filter is too large to dump

On Mon, Feb 19, 2018 at 12:32 PM, Roman Kapl <code@...pl.cz> wrote:
> So far, if the filter was too large to fit in the allocated skb, the
> kernel did not return any error and stopped dumping. Modify the dumper
> so that it returns -EMSGSIZE when a filter fails to dump and it is the
> first filter in the skb. If we are not first, we will get a next chance
> with more room.
>
> I understand this is pretty near to being an API change, but the
> original design (silent truncation) can be considered a bug.
>
> Note: The error case can happen pretty easily if you create a filter
> with 32 actions and have 4kb pages. Also recent versions of iproute try
> to be clever with their buffer allocation size, which in turn leads to
>
> Signed-off-by: Roman Kapl <code@...pl.cz>

Acked-by: Cong Wang <xiyou.wangcong@...il.com>