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D. Wythe 94a0ae698b net/smc: avoid data corruption caused by decline [ Upstream commit `e6d71b437a` ] We found a data corruption issue during testing of SMC-R on Redis applications. The benchmark has a low probability of reporting a strange error as shown below. "Error: Protocol error, got "\xe2" as reply type byte" Finally, we found that the retrieved error data was as follows: 0xE2 0xD4 0xC3 0xD9 0x04 0x00 0x2C 0x20 0xA6 0x56 0x00 0x16 0x3E 0x0C 0xCB 0x04 0x02 0x01 0x00 0x00 0x20 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xE2 It is quite obvious that this is a SMC DECLINE message, which means that the applications received SMC protocol message. We found that this was caused by the following situations: client server ¦ clc proposal -------------> ¦ clc accept <------------- ¦ clc confirm -------------> wait llc confirm send llc confirm ¦failed llc confirm ¦ x------ (after 2s)timeout wait llc confirm rsp wait decline (after 1s) timeout (after 2s) timeout ¦ decline --------------> ¦ decline <-------------- As a result, a decline message was sent in the implementation, and this message was read from TCP by the already-fallback connection. This patch double the client timeout as 2x of the server value, With this simple change, the Decline messages should never cross or collide (during Confirm link timeout). This issue requires an immediate solution, since the protocol updates involve a more long-term solution. Fixes: `0fb0b02bd6` ("net/smc: adapt SMC client code to use the LLC flow") Signed-off-by: D. Wythe <alibuda@linux.alibaba.com> Reviewed-by: Wen Gu <guwen@linux.alibaba.com> Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2023-12-03 07:32:08 +01:00
arch	RISC-V: drop error print from riscv_hartid_to_cpuid()	2023-11-28 17:07:23 +00:00
block	blk-core: use pr_warn_ratelimited() in bio_check_ro()	2023-11-20 11:52:17 +01:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: pcrypt - Fix hungtask for PADATA_RESET	2023-11-28 17:06:58 +00:00
Documentation	smp,csd: Throw an error if a CSD lock is stuck for too long	2023-11-28 17:06:55 +00:00
drivers	net: usb: ax88179_178a: fix failed operations during ax88179_reset	2023-12-03 07:32:07 +01:00
fs	afs: Make error on cell lookup failure consistent with OpenAFS	2023-12-03 07:32:07 +01:00
include	HID: fix HID device resource race between HID core and debugging support	2023-12-03 07:32:07 +01:00
init	proc: sysctl: prevent aliased sysctls from getting passed to init	2023-11-28 17:07:08 +00:00
io_uring	io_uring/net: ensure socket is marked connected on connect retry	2023-11-20 11:52:18 +01:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	tracing: Have trace_event_file have ref counters	2023-11-28 17:07:23 +00:00
lib	lib/generic-radix-tree.c: Don't overflow in peek()	2023-11-28 17:06:54 +00:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm: kmem: drop __GFP_NOFAIL when allocating objcg vectors	2023-11-28 17:07:20 +00:00
net	net/smc: avoid data corruption caused by decline	2023-12-03 07:32:08 +01:00
rust	rust: allocator: Prevent mis-aligned allocation	2023-08-11 12:08:18 +02:00
samples	fprobe: Pass entry_data to handlers	2023-10-25 12:03:12 +02:00
scripts	randstruct: Fix gcc-plugin performance mode to stay in group	2023-11-28 17:07:07 +00:00
security	ima: detect changes to the backing overlay file	2023-11-28 17:07:12 +00:00
sound	ALSA: hda/realtek: Add quirks for HP Laptops	2023-11-28 17:07:16 +00:00
tools	cxl/region: Fix x1 root-decoder granularity calculations	2023-11-28 17:07:18 +00:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	kvm/vfio: ensure kvg instance stays around in kvm_vfio_group_add()	2023-09-13 09:42:46 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -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	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
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	devlink: move code to a dedicated directory	2023-08-30 16:11:00 +02:00
Makefile	Linux 6.1.64	2023-11-28 17:07:23 +00:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -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 Restructured Text 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.