From 40dc9416cc957ac8b74d09550a808fabfd4435f8 Mon Sep 17 00:00:00 2001
From: Paolo Abeni <pabeni@redhat.com>
Date: Wed, 20 Jan 2021 15:39:13 +0100
Subject: [PATCH] mptcp: schedule work for better snd subflow selection

Otherwise the packet scheduler policy will not be
enforced when pushing pending data at MPTCP-level
ack reception time.

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 net/mptcp/protocol.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e741201acc98f..8cb582eee2862 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2242,6 +2242,7 @@ static void mptcp_worker(struct work_struct *work)
 	if (unlikely(state == TCP_CLOSE))
 		goto unlock;
 
+	mptcp_push_pending(sk, 0);
 	mptcp_check_data_fin_ack(sk);
 	__mptcp_flush_join_list(msk);
 
@@ -2899,10 +2900,14 @@ void __mptcp_check_push(struct sock *sk, struct sock *ssk)
 	if (!mptcp_send_head(sk))
 		return;
 
-	if (!sock_owned_by_user(sk))
-		__mptcp_subflow_push_pending(sk, ssk);
-	else
+	if (!sock_owned_by_user(sk)) {
+		if (mptcp_subflow_get_send(mptcp_sk(sk)) == ssk)
+			__mptcp_subflow_push_pending(sk, ssk);
+		else
+			mptcp_schedule_work(sk);
+	} else {
 		set_bit(MPTCP_PUSH_PENDING, &mptcp_sk(sk)->flags);
+	}
 }
 
 #define MPTCP_DEFERRED_ALL (TCPF_WRITE_TIMER_DEFERRED)
-- 
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