netdev - Re: [RFC PATCH 0/5] net: remove sk skb caches

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Message-ID: <CANn89iLOL0er35k=G=BeDKtOcA6Rn3n3k+pgVQX8bVFdA1w_Dw@mail.gmail.com>
Date:   Fri, 17 Sep 2021 09:47:57 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Ayush Sawal <ayush.sawal@...lsio.com>,
        MPTCP Upstream <mptcp@...ts.linux.dev>
Subject: Re: [RFC PATCH 0/5] net: remove sk skb caches

On Fri, Sep 17, 2021 at 8:39 AM Paolo Abeni <pabeni@...hat.com> wrote:
>
> Eric noted we would be better off reverting the sk
> skb caches.
>
> MPTCP relies on such a feature, so we need a
> little refactor of the MPTCP tx path before the mentioned
> revert.
>
> The first patch avoids that the next one will cause a name
> clash. The second exposes additional TCP helpers. The 3rd patch
> changes the MPTCP code to do locally the whole skb allocation
> and updating, so it does not rely anymore on core TCP helpers
> for that nor the sk skb cache.
>
> As a side effect, we can drop the tcp_build_frag helper.
>
> Finally, we can pull Eric's revert.
>
> Note that patch 3/5 will conflict with the pending -net fix
> for a recently reported syzkaller splat.
>

Thanks for working on this Paolo !