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mptcp: skip to next candidate if subflow has unacked data

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In case a subflow path is blocked, MPTCP-level retransmit may not take
place anymore because such subflow is likely to have unacked data left
in its write queue.

Ignore subflows that have experienced loss and test next candidate.

Fixes: 3b1d6210a9 ("mptcp: implement and use MPTCP-level retransmission")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Florian Westphal 2020-11-19 11:45:56 -08:00 committed by Jakub Kicinski
parent 26aa231439
commit 860975c6f8
1 changed files with 4 additions and 1 deletions
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5
net/mptcp/protocol.c
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@ -1726,8 +1726,11 @@ static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk)
continue;
/* still data outstanding at TCP level? Don't retransmit. */
if (!tcp_write_queue_empty(ssk))
if (!tcp_write_queue_empty(ssk)) {
if (inet_csk(ssk)->icsk_ca_state >= TCP_CA_Loss)
continue;
return NULL;
}
if (subflow->backup) {
if (!backup)