netdev - Re: [PATCH net] net: mptcp: make DACK4/DACK8 usage consistent among all subflows

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Date:   Tue, 6 Oct 2020 16:58:58 -0700 (PDT)
From:   Mat Martineau <mathew.j.martineau@...ux.intel.com>
To:     Davide Caratti <dcaratti@...hat.com>
cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        mptcp@...ts.01.org, Christoph Paasch <cpaasch@...le.com>,
        pabeni@...hat.com, Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH net] net: mptcp: make DACK4/DACK8 usage consistent among
 all subflows

On Tue, 6 Oct 2020, Davide Caratti wrote:

> using packetdrill it's possible to observe the same MPTCP DSN being acked
> by different subflows with DACK4 and DACK8. This is in contrast with what
> specified in RFC8684 §3.3.2: if an MPTCP endpoint transmits a 64-bit wide
> DSN, it MUST be acknowledged with a 64-bit wide DACK. Fix 'use_64bit_ack'
> variable to make it a property of MPTCP sockets, not TCP subflows.
>
> Fixes: a0c1d0eafd1e ("mptcp: Use 32-bit DATA_ACK when possible")
> Acked-by: Paolo Abeni <pabeni@...hat.com>
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>
> ---
> net/mptcp/options.c  | 2 +-
> net/mptcp/protocol.h | 2 +-
> net/mptcp/subflow.c  | 3 +--
> 3 files changed, 3 insertions(+), 4 deletions(-)

Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>

--
Mat Martineau
Intel