提交 860975c6 编写于 作者: F Florian Westphal 提交者: Jakub Kicinski

mptcp: skip to next candidate if subflow has unacked data

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: 3b1d6210 ("mptcp: implement and use MPTCP-level retransmission")
Signed-off-by: NFlorian Westphal <fw@strlen.de>
Signed-off-by: NMat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
上级 26aa2314
...@@ -1726,8 +1726,11 @@ static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk) ...@@ -1726,8 +1726,11 @@ static struct sock *mptcp_subflow_get_retrans(const struct mptcp_sock *msk)
continue; continue;
/* still data outstanding at TCP level? Don't retransmit. */ /* 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; return NULL;
}
if (subflow->backup) { if (subflow->backup) {
if (!backup) if (!backup)
......
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