Hi Greg,
On 04/03/2024 09:28, gregkh@linuxfoundation.org wrote:
The patch below does not apply to the 5.4-stable tree.
(...)
------------------ original commit in Linus's tree ------------------
From b9cd26f640a308ea314ad23532de9a8592cd09d2 Mon Sep 17 00:00:00 2001 From: Paolo Abeni pabeni@redhat.com Date: Fri, 23 Feb 2024 17:14:14 +0100 Subject: [PATCH] mptcp: push at DSS boundaries
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")
I guess this patch has been selected for v5.4 by accident because MPTCP has been introduced in v5.6. In other words, we don't need this patch for v5.4 :)
Cheers, Matt