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Joel Stanley 0733316978 net: ftgmac100: Disable hardware checksum on AST2600 
[ Upstream commit 6fd45e79e8 ]

The AST2600 when using the i210 NIC over NC-SI has been observed to
produce incorrect checksum results with specific MTU values. This was
first observed when sending data across a long distance set of networks.

On a local network, the following test was performed using a 1MB file of
random data.

On the receiver run this script:

 #!/bin/bash
 while [ 1 ]; do
        # Zero the stats
        nstat -r  > /dev/null
        nc -l 9899 > test-file
        # Check for checksum errors
        TcpInCsumErrors=$(nstat | grep TcpInCsumErrors)
        if [ -z "$TcpInCsumErrors" ]; then
                echo No TcpInCsumErrors
        else
                echo TcpInCsumErrors = $TcpInCsumErrors
        fi
 done

On an AST2600 system:

 # nc <IP of  receiver host> 9899 < test-file

The test was repeated with various MTU values:

 # ip link set mtu 1410 dev eth0

The observed results:

 1500 - good
 1434 - bad
 1400 - good
 1410 - bad
 1420 - good

The test was repeated after disabling tx checksumming:

 # ethtool -K eth0 tx-checksumming off

And all MTU values tested resulted in transfers without error.

An issue with the driver cannot be ruled out, however there has been no
bug discovered so far.

David has done the work to take the original bug report of slow data
transfer between long distance connections and triaged it down to this
test case.

The vendor suspects this this is a hardware issue when using NC-SI. The
fixes line refers to the patch that introduced AST2600 support.

Reported-by: David Wilder <wilder@us.ibm.com>
Reviewed-by: Dylan Hung <dylan_hung@aspeedtech.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-06-06 08:47:50 +02:00
arch KVM: arm64: Don't hypercall before EL2 init 2022-06-06 08:47:50 +02:00
block block/mq-deadline: Set the fifo_time member also if inserting at head 2022-05-25 09:59:06 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: xts - Add softdep on ecb 2022-04-08 13:58:36 +02:00
Documentation random: fix sysctl documentation nits 2022-05-30 09:27:12 +02:00
drivers net: ftgmac100: Disable hardware checksum on AST2600 2022-06-06 08:47:50 +02:00
fs afs: Fix afs_getattr() to refetch file status if callback break occurred 2022-05-25 09:59:15 +02:00
include random: move randomize_page() into mm where it belongs 2022-05-30 09:27:18 +02:00
init random: handle latent entropy and command line from random_init() 2022-05-30 09:27:17 +02:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel timekeeping: Add raw clock fallback for random_get_entropy() 2022-05-30 09:27:13 +02:00
lib percpu_ref_init(): clean ->percpu_count_ref on failure 2022-06-06 08:47:50 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm random: move randomize_page() into mm where it belongs 2022-05-30 09:27:18 +02:00
net net: af_key: check encryption module availability consistency 2022-06-06 08:47:50 +02:00
samples samples/bpf, xdpsock: Fix race when running for fix duration of time 2022-04-08 13:58:18 +02:00
scripts kconfig: add fflush() before ferror() check 2022-05-25 09:58:59 +02:00
security lockdown: also lock down previous kgdb use 2022-05-25 09:59:10 +02:00
sound ALSA: hda/realtek: Add quirk for the Framework Laptop 2022-06-06 08:47:49 +02:00
tools selftests: add ping test with ping_group_range tuned 2022-05-25 09:59:13 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-25 09:59:03 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.12 2022-05-30 09:27:19 +02:00
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.