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From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
Date: Fri, 23 Feb 2024 17:14:14 +0100
Subject: [PATCH net 04/10] mptcp: push at DSS boundaries
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Message-Id: <20240223-upstream-net-20240223-misc-fixes-v1-4-162e87e48497@kernel.org>
References: <20240223-upstream-net-20240223-misc-fixes-v1-0-162e87e48497@kernel.org>
In-Reply-To: <20240223-upstream-net-20240223-misc-fixes-v1-0-162e87e48497@kernel.org>
To: mptcp@lists.linux.dev, Mat Martineau <martineau@kernel.org>, 
 Geliang Tang <geliang@kernel.org>, "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, Florian Westphal <fw@strlen.de>, 
 Kishen Maloor <kishen.maloor@intel.com>, Shuah Khan <shuah@kernel.org>, 
 Peter Krystad <peter.krystad@linux.intel.com>, 
 Christoph Paasch <cpaasch@apple.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-kselftest@vger.kernel.org, 
 "Matthieu Baerts (NGI0)" <matttbe@kernel.org>, stable@vger.kernel.org

From: Paolo Abeni <pabeni@redhat.com>

when inserting not contiguous data in the subflow write queue,
the protocol creates a new skb and prevent the TCP stack from
merging it later with already queued skbs by setting the EOR marker.

Still no push flag is explicitly set at the end of previous GSO
packet, making the aggregation on the receiver side sub-optimal -
and packetdrill self-tests less predictable.

Explicitly mark the end of not contiguous DSS with the push flag.

Fixes: 6d0060f600ad ("mptcp: Write MPTCP DSS headers to outgoing data packets")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
 net/mptcp/protocol.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 948606a537da..442fa7d9b57a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1260,6 +1260,7 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
 		mpext = mptcp_get_ext(skb);
 		if (!mptcp_skb_can_collapse_to(data_seq, skb, mpext)) {
 			TCP_SKB_CB(skb)->eor = 1;
+			tcp_mark_push(tcp_sk(ssk), skb);
 			goto alloc_skb;
 		}
 

-- 
2.43.0