netdev - Re: Problem in pfmemalloc skb handling in net/core/dev.c

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Message-ID: <CAJht_EOmcOdKGKnoUQDJD-=mnHOK0MKiV0+4Epty5H5DMED-qw@mail.gmail.com>
Date:   Fri, 9 Apr 2021 03:14:00 -0700
From:   Xie He <xie.he.0141@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Mel Gorman <mgorman@...e.de>, jslaby@...e.cz,
        Neil Brown <neilb@...e.de>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mike Christie <michaelc@...wisc.edu>,
        Eric B Munson <emunson@...bm.net>,
        Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
        Christoph Lameter <cl@...ux.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Problem in pfmemalloc skb handling in net/core/dev.c

On Fri, Apr 9, 2021 at 3:04 AM Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> Note that pfmemalloc skbs are normally dropped in sk_filter_trim_cap()
>
> Simply make sure your protocol use it.

It seems "sk_filter_trim_cap" needs an "struct sock" argument. Some of
my protocols act like a middle layer to another protocol and don't
have any "struct sock".

Also, I think this is a problem in net/core/dev.c, there are a lot of
old protocols that are not aware of pfmemalloc skbs. I don't think
it's a good idea to fix them one by one.