Merge branch 'revert-advertising-the-tcp-mss-from-the-configured-mtu'

Esko Mobius AKA Yongjian Wang says:

====================
Revert advertising the TCP MSS from the configured MTU

Commit 2640e6419594 ("net: advertise TCP MSS from the configured MTU,
not the learned PMTU") breaks TCP for clients behind networks that
filter inbound ICMP, when the server reaches them through a hop with a
smaller MTU: the handshake completes, then the connection stalls as
soon as the client sends full-size segments. This was reported in [1]
and confirmed on 7.3-rc7; reverting the commit on top of 7.3-rc7 fixes
it. Details and numbers are in patch 2.

The asymmetric (DSR-style) case that commit targets can still be served
by the existing per-route advmss metric, which overrides the default
after the revert; patch 2 includes a test of that as well. If you would
rather keep the new behaviour as an explicit opt-in some other way, I
am happy to test or rework this.

Patch 1 removes the packetdrill tests that assert the reverted
behaviour, patch 2 is the revert itself.

[1] https://lore.kernel.org/regressions/4F0FAEB6-A13B-47F3-BFF1-C706686C6F64@gmail.com/
====================

Link: https://patch.msgid.link/20261026-advmss-revert-v1-0-272fa4b7ecb6@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions