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mptcp: fix retransmission loop when csum is enabled

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Sashiko noted that retransmission with csum enabled can actually
transmit new data, but currently the relevant code does not update
accordingly snd_nxt.

The may cause incoming ack drop and an endless retransmission loop.

Address the issue incrementing snd_nxt as needed.

Fixes: 4e14867d5e ("mptcp: tune re-injections for csum enabled mode")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260602-net-mptcp-misc-fixes-7-1-rc7-v2-2-856831229976@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2026-06-02 22:14:09 +10:00 committed by Jakub Kicinski
parent 9d8d28738f
commit d1918b36ed
1 changed files with 4 additions and 0 deletions
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4
net/mptcp/protocol.c
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@ -2869,6 +2869,10 @@ static void __mptcp_retrans(struct sock *sk)
msk->bytes_retrans += len;
dfrag->already_sent = max(dfrag->already_sent, len);
/* With csum enabled retransmission can send new data. */
if (after64(dfrag->already_sent + dfrag->data_seq, msk->snd_nxt))
WRITE_ONCE(msk->snd_nxt, dfrag->already_sent + dfrag->data_seq);
reset_timer:
mptcp_check_and_set_pending(sk);