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mptcp: add a missing retransmission timer scheduling

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Currently we do not schedule the MPTCP retransmission
timer after pushing the data when such action happens
in the subflow context.

This may cause hang-up on active-backup scenarios, or
even when only single subflow msks are involved, if we lost
some peer's ack.

Fixes: 6e628cd3a8 ("mptcp: use mptcp release_cb for delayed tasks")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-02-11 15:30:42 -08:00 committed by David S. Miller
parent e3859603ba
commit d09d818ec2
2 changed files with 4 additions and 2 deletions
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3
net/mptcp/options.c
View file

@ -880,8 +880,7 @@ static void ack_update_msk(struct mptcp_sock *msk,
msk->wnd_end = new_wnd_end;
/* this assumes mptcp_incoming_options() is invoked after tcp_ack() */
if (after64(msk->wnd_end, READ_ONCE(msk->snd_nxt)) &&
sk_stream_memory_free(ssk))
if (after64(msk->wnd_end, READ_ONCE(msk->snd_nxt)))
__mptcp_check_push(sk, ssk);
if (after64(new_snd_una, old_snd_una)) {

3
net/mptcp/protocol.c
View file

@ -1582,6 +1582,9 @@ static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk)
mptcp_set_timeout(sk, ssk);
tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
info.size_goal);
if (!mptcp_timer_pending(sk))
mptcp_reset_timer(sk);
if (msk->snd_data_fin_enable &&
msk->snd_nxt + 1 == msk->write_seq)
mptcp_schedule_work(sk);