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Yan Zhai 61e7e18fa6 udp: gso: do not drop small packets when PMTU reduces ... [ Upstream commit 235174b2be ] Commit 4094871db1 ("udp: only do GSO if # of segs > 1") avoided GSO for small packets. But the kernel currently dismisses GSO requests only after checking MTU/PMTU on gso_size. This means any packets, regardless of their payload sizes, could be dropped when PMTU becomes smaller than requested gso_size. We encountered this issue in production and it caused a reliability problem that new QUIC connection cannot be established before PMTU cache expired, while non GSO sockets still worked fine at the same time. Ideally, do not check any GSO related constraints when payload size is smaller than requested gso_size, and return EMSGSIZE instead of EINVAL on MTU/PMTU check failure to be more specific on the error cause. Fixes: 4094871db1 ("udp: only do GSO if # of segs > 1") Signed-off-by: Yan Zhai <yan@cloudflare.com> Suggested-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-03-13 12:50:22 +01:00
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fault-injection	docs: fault-injection: convert docs to ReST and rename to *.rst	2019-06-14 14:21:07 -06:00
ktest	ktest.pl: Check kernelrelease return in get_version	2025-03-13 12:50:15 +01:00
kunit	kunit: tool: Import missing importlib.abc	2022-02-23 12:03:04 +01:00
nvdimm	memremap: remove support for external pgmap refcounts	2022-08-17 14:23:43 +02:00
radix-tree	radix tree test suite: fix incorrect allocation size for pthreads	2023-08-16 18:21:58 +02:00
scatterlist	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
selftests	udp: gso: do not drop small packets when PMTU reduces	2025-03-13 12:50:22 +01:00
vsock	vsock_diag_test: remove free_sock_stat() call in test_no_sockets	2021-10-15 17:21:34 -07:00