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Vinicius Costa Gomes afa141583d igc: Retrieve TX timestamp during interrupt handling 
When the interrupt is handled, the TXTT_0 bit in the TSYNCTXCTL
register should already be set and the timestamp value already loaded
in the appropriate register.

This simplifies the handling, and reduces the latency for retrieving
the TX timestamp, which increase the amount of TX timestamps that can
be handled in a given time period.

As the "work" function doesn't run in a workqueue anymore, rename it
to something more sensible, a event handler.

Using ntpperf[1] we can see the following performance improvements:

Before:

$ sudo ./ntpperf -i enp3s0 -m 10:22:22:22:22:21 -d 192.168.1.3 -s 172.18.0.0/16 -I -H -o -37
               |          responses            |     TX timestamp offset (ns)
rate   clients |  lost invalid   basic  xleave |    min    mean     max stddev
1000       100   0.00%   0.00%   0.00% 100.00%      -56      +9     +52     19
1500       150   0.00%   0.00%   0.00% 100.00%      -40     +30     +75     22
2250       225   0.00%   0.00%   0.00% 100.00%      -11     +29     +72     15
3375       337   0.00%   0.00%   0.00% 100.00%      -18     +40     +88     22
5062       506   0.00%   0.00%   0.00% 100.00%      -19     +23     +77     15
7593       759   0.00%   0.00%   0.00% 100.00%       +7     +47   +5168     43
11389     1138   0.00%   0.00%   0.00% 100.00%      -11     +41   +5240     39
17083     1708   0.00%   0.00%   0.00% 100.00%      +19     +60   +5288     50
25624     2562   0.00%   0.00%   0.00% 100.00%       +1     +56   +5368     58
38436     3843   0.00%   0.00%   0.00% 100.00%      -84     +12   +8847     66
57654     5765   0.00%   0.00% 100.00%   0.00%
86481     8648   0.00%   0.00% 100.00%   0.00%
129721   12972   0.00%   0.00% 100.00%   0.00%
194581   16384   0.00%   0.00% 100.00%   0.00%
291871   16384  27.35%   0.00%  72.65%   0.00%
437806   16384  50.05%   0.00%  49.95%   0.00%

After:

$ sudo ./ntpperf -i enp3s0 -m 10:22:22:22:22:21 -d 192.168.1.3 -s 172.18.0.0/16 -I -H -o -37
               |          responses            |     TX timestamp offset (ns)
rate   clients |  lost invalid   basic  xleave |    min    mean     max stddev
1000       100   0.00%   0.00%   0.00% 100.00%      -44      +0     +61     19
1500       150   0.00%   0.00%   0.00% 100.00%       -6     +39     +81     16
2250       225   0.00%   0.00%   0.00% 100.00%      -22     +25     +69     15
3375       337   0.00%   0.00%   0.00% 100.00%      -28     +15     +56     14
5062       506   0.00%   0.00%   0.00% 100.00%       +7     +78    +143     27
7593       759   0.00%   0.00%   0.00% 100.00%      -54     +24    +144     47
11389     1138   0.00%   0.00%   0.00% 100.00%      -90     -33     +28     21
17083     1708   0.00%   0.00%   0.00% 100.00%      -50      -2     +35     14
25624     2562   0.00%   0.00%   0.00% 100.00%      -62      +7     +66     23
38436     3843   0.00%   0.00%   0.00% 100.00%      -33     +30   +5395     36
57654     5765   0.00%   0.00% 100.00%   0.00%
86481     8648   0.00%   0.00% 100.00%   0.00%
129721   12972   0.00%   0.00% 100.00%   0.00%
194581   16384  19.50%   0.00%  80.50%   0.00%
291871   16384  35.81%   0.00%  64.19%   0.00%
437806   16384  55.40%   0.00%  44.60%   0.00%

[1] https://github.com/mlichvar/ntpperf

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2023-06-22 08:22:35 -07:00
arch bpf-for-netdev 2023-06-21 13:59:46 -07:00
block blk-mq: fix blk_mq_hw_ctx active request accounting 2023-06-03 17:20:00 -06:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-06-02 15:36:23 +02:00
Documentation Devicetree fixes for v6.4, part 3: 2023-06-13 10:27:56 -07:00
drivers igc: Retrieve TX timestamp during interrupt handling 2023-06-22 08:22:35 -07:00
fs Fix two regressions in ext4, one report by syzkaller[1], and reported by 2023-06-15 15:40:58 -07:00
include netfilter pull request 23-06-21 2023-06-22 14:39:06 +02:00
init Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
io_uring io_uring/io-wq: don't clear PF_IO_WORKER on exit 2023-06-12 11:16:09 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel bpf-for-netdev 2023-06-21 13:59:46 -07:00
lib 19 hotfixes. 14 are cc:stable and the remainder address issues which were 2023-06-12 16:14:34 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm 19 hotfixes. 14 are cc:stable and the remainder address issues which were 2023-06-12 16:14:34 -07:00
net netfilter pull request 23-06-21 2023-06-22 14:39:06 +02:00
rust Rust changes for v6.4 2023-04-30 11:20:22 -07:00
samples samples/bpf: Drop unnecessary fallthrough 2023-05-16 19:44:05 +02:00
scripts Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
security selinux: don't use make's grouped targets feature yet 2023-06-01 13:56:13 -04:00
sound ALSA: hda/realtek: Enable 4 amplifiers instead of 2 on a HP platform 2023-06-06 17:44:24 +02:00
tools selftests: forwarding: Fix race condition in mirror installation 2023-06-22 10:03:07 +02:00
usr initramfs: Check negative timestamp to prevent broken cpio archive 2023-04-16 17:37:01 +09:00
virt KVM: Fix vcpu_array[0] races 2023-05-19 13:56:26 -04:00
.clang-format cxl for v6.4 2023-04-30 11:51:51 -07:00
.cocciconfig
.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 *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore linux-kselftest-kunit-6.4-rc1 2023-04-24 12:31:32 -07:00
.mailmap mailmap: add entry for John Keeping 2023-06-12 11:31:52 -07:00
.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: sctp: move Neil to CREDITS 2023-05-12 08:51:32 +01:00
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 MAINTAINERS: add me as maintainer of MEDIATEK SWITCH DRIVER 2023-06-20 09:40:26 +01:00
Makefile Linux 6.4-rc6 2023-06-11 14:35:30 -07:00
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.