netdev - Re: [PATCH net] tcp: consistently disable header prediction for mptcp

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Date:   Wed, 30 Jun 2021 15:20:03 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Davide Caratti <dcaratti@...hat.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        mptcp@...ts.linux.dev
Subject: Re: [PATCH net] tcp: consistently disable header prediction for mptcp



On 6/30/21 1:42 PM, Paolo Abeni wrote:
> The MPTCP receive path is hooked only into the TCP slow-path.
> The DSS presence allows plain MPTCP traffic to hit that
> consistently.
> 
> Since commit e1ff9e82e2ea ("net: mptcp: improve fallback to TCP"),
> when an MPTCP socket falls back to TCP, it can hit the TCP receive
> fast-path, and delay or stop triggering the event notification.
> 
> Address the issue explicitly disabling the header prediction
> for MPTCP sockets.
> 
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/200
> Fixes: e1ff9e82e2ea ("net: mptcp: improve fallback to TCP")
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---

SGTM, thanks.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>