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Felipe Negrelli Wolter 100a75d56b wifi: wfx: fix case where rates are out of order 
[ Upstream commit ea2274ab0b ]

When frames are sent over the air, the device always applies the data
rates in descending order. The driver assumed Minstrel also provided
rate in descending order.

However, in some cases, Minstrel can a choose a fallback rate greater
than the primary rate. In this case, the two rates was inverted, the
device try highest rate first and we get many retries.

Since the device always applies rates in descending order, the
workaround is to drop the rate when it higher than its predecessor in
the rate list. Thus [ 4, 5, 3 ] becomes [ 4, 3 ].

This patch has been tested in isolated room with a series of
attenuators. Here are the Minstrel statistics with 80dBm of attenuation:

  Without the fix:

                  best    ____________rate__________    ____statistics___    _____last____    ______sum-of________
    mode guard #  rate   [name   idx airtime  max_tp]  [avg(tp) avg(prob)]  [retry|suc|att]  [#success | #attempts]
    HT20  LGI  1       S  MCS0     0    1477     5.6       5.2      82.7       3     0 0             3   4
    HT20  LGI  1          MCS1     1     738    10.6       0.0       0.0       0     0 0             0   1
    HT20  LGI  1     D    MCS2     2     492    14.9      13.5      81.5       5     0 0             5   9
    HT20  LGI  1    C     MCS3     3     369    18.8      17.6      84.3       5     0 0            76   96
    HT20  LGI  1  A   P   MCS4     4     246    25.4      22.4      79.5       5     0 0         11268   14026
    HT20  LGI  1   B   S  MCS5     5     185    30.7      19.7      57.7       5     8 9          3918   9793
    HT20  LGI  1          MCS6     6     164    33.0       0.0       0.0       5     0 0             6   102
    HT20  LGI  1          MCS7     7     148    35.1       0.0       0.0       0     0 0             0   44

  With the fix:

                  best    ____________rate__________    ____statistics___    _____last____    ______sum-of________
    mode guard #  rate   [name   idx airtime  max_tp]  [avg(tp) avg(prob)]  [retry|suc|att]  [#success | #attempts]
    HT20  LGI  1       S  MCS0     0    1477     5.6       1.8      28.6       1     0 0             1   5
    HT20  LGI  1     DP   MCS1     1     738    10.6       9.7      82.6       4     0 0            14   34
    HT20  LGI  1          MCS2     2     492    14.9       9.2      55.4       5     0 0            52   77
    HT20  LGI  1   B   S  MCS3     3     369    18.8      15.6      74.9       5     1 1           417   554
    HT20  LGI  1  A       MCS4     4     246    25.4      16.7      59.2       5     1 1         13812   17951
    HT20  LGI  1    C  S  MCS5     5     185    30.7      14.0      41.0       5     1 5            57   640
    HT20  LGI  1          MCS6     6     164    33.0       0.0       0.0       0     0 1             0   48
    HT20  LGI  1       S  MCS7     7     148    35.1       0.0       0.0       0     0 0             0   36

We can notice the device try now to send with lower rates (and high
success rates). At the end, we measured 20-25% better throughput with
this patch.

Fixes: 9bca45f3d6 ("staging: wfx: allow to send 802.11 frames")
Tested-by: Olivier Souloumiac <olivier.souloumiac@silabs.com>
Tested-by: Alexandr Suslenko <suslenko.o@ajax.systems>
Reported-by: Alexandr Suslenko <suslenko.o@ajax.systems>
Co-developed-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Felipe Negrelli Wolter <felipe.negrelliwolter@silabs.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20231004123039.157112-1-jerome.pouiller@silabs.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-11-20 11:51:54 +01:00
arch x86/boot: Fix incorrect startup_gdt_descr.size 2023-11-20 11:51:50 +01:00
block blk-throttle: check for overflow in calculate_bytes_allowed 2023-11-02 09:35:29 +01:00
certs certs: Fix build error when PKCS#11 URI contains semicolon 2023-02-09 11:28:11 +01:00
crypto crypto: lrw,xts - Replace strlcpy with strscpy 2023-09-23 11:11:01 +02:00
Documentation dt-bindings: mmc: sdhci-msm: correct minimum number of clocks 2023-10-25 12:03:13 +02:00
drivers wifi: wfx: fix case where rates are out of order 2023-11-20 11:51:54 +01:00
fs pstore/platform: Add check for kstrdup 2023-11-20 11:51:50 +01:00
include wifi: cfg80211: add flush functions for wiphy work 2023-11-20 11:51:51 +01:00
init sched/psi: Select KERNFS as needed 2023-09-13 09:42:28 +02:00
io_uring io_uring: kiocb_done() should *not* trust ->ki_pos if ->{read,write}_iter() failed 2023-11-08 14:11:02 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel genirq/matrix: Exclude managed interrupts in irq_matrix_allocated() 2023-11-20 11:51:51 +01:00
lib maple_tree: add GFP_KERNEL to allocations in mas_expected_entries() 2023-11-02 09:35:24 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm vfs: fix readahead(2) on block devices 2023-11-20 11:51:50 +01:00
net tcp_metrics: do not create an entry from tcp_init_metrics() 2023-11-20 11:51:53 +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 kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[] 2023-10-25 12:03:16 +02:00
security KEYS: trusted: Remove redundant static calls usage 2023-10-19 23:08:50 +02:00
sound ASoC: SOF: sof-pci-dev: Fix community key quirk detection 2023-11-08 14:11:05 +01:00
tools selftests/bpf: Correct map_fd to data_fd in tailcalls 2023-11-20 11:51:51 +01:00
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
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes
.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 6.1.62 2023-11-08 14:11:05 +01:00
README

README 

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

There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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    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.