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Yan Zhai 235174b2be udp: gso: do not drop small packets when PMTU reduces 
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>
2025-02-03 10:13:27 +00:00
arch s390 fixes for 6.14 merge window 2025-01-30 10:53:49 -08:00
block Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
Documentation First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
drivers tg3: Disable tg3 PCIe AER on system reboot 2025-02-03 10:12:14 +00:00
fs Provide stable parent and name to ->d_revalidate() instances 2025-01-30 09:13:35 -08:00
include First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
init treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
io_uring treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel Summary: 2025-01-29 10:35:40 -08:00
lib CRC fixes for 6.14 2025-01-29 10:50:28 -08:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm Summary: 2025-01-29 10:35:40 -08:00
net udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
rust Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
samples Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
scripts Char/Misc/IIO driver updates for 6.14-rc1 2025-01-27 16:51:51 -08:00
security treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
sound Driver core and debugfs updates 2025-01-28 12:25:12 -08:00
tools udp: gso: do not drop small packets when PMTU reduces 2025-02-03 10:13:27 +00:00
usr kbuild: Drop support for include/asm-<arch> in headers_check.pl 2024-12-21 11:43:17 +09:00
virt Merge branch 'kvm-mirror-page-tables' into HEAD 2025-01-20 07:15:58 -05:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-01-10 00:17:25 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: use host dylib naming convention to support macOS 2025-01-10 01:01:24 +01:00
.mailmap Mainly individually changelogged singleton patches. The patch series in 2025-01-26 17:50:53 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Mainly individually changelogged singleton patches. The patch series in 2025-01-26 17:50:53 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS First batch of fixes for 6.14. Nothing really stands out, 2025-01-30 12:24:20 -08:00
Makefile Networking changes for 6.14. 2025-01-22 08:28:57 -08:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.