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Vladimir Oltean 039b167d68 net: dsa: sja1105: don't use burst SPI reads for port statistics 
The current internal sja1105 driver API is optimized for retrieving many
statistics counters at once. But the switch does not do atomic snapshotting
for them anyway.

In case we start reporting the hardware port counters through
ndo_get_stats64 as well, not just ethtool, it would be good to be able
to read individual port counters and not all of them.

Additionally, since Arnd Bergmann's commit ae1804de93 ("dsa: sja1105:
dynamically allocate stats structure"), sja1105_get_ethtool_stats
allocates memory dynamically, since struct sja1105_port_status was
deemed to consume too much stack memory. That is not ideal.
The large structure is only needed because of the burst read.
If we read statistics one by one, we can consume less memory, and
we can avoid dynamic allocation.

Additionally, latency-sensitive interfaces such as PTP operations (for
phc2sys) might suffer if the SPI mutex is being held for too long, which
happens in the case of SPI burst reads. By reading counters one by one,
we give a chance for higher priority processes to preempt and take the
SPI bus mutex for accessing the PTP clock.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-05-21 14:01:41 -07:00
arch Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-05-19 12:58:29 -07:00
block block-5.13-2021-05-07 2021-05-07 11:35:12 -07:00
certs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
crypto for-5.13/drivers-2021-04-27 2021-04-28 14:39:37 -07:00
Documentation dt-bindings: net: dsa: add MT7530 interrupt controller binding 2021-05-19 13:27:42 -07:00
drivers net: dsa: sja1105: don't use burst SPI reads for port statistics 2021-05-21 14:01:41 -07:00
fs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
include Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2021-05-19 12:58:29 -07:00
init Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
ipc ipc/sem.c: spelling fix 2021-05-07 00:26:34 -07:00
kernel bpf: Make some symbols static 2021-05-19 10:47:43 -07:00
lib Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
LICENSES
mm mm: fix typos in comments 2021-05-07 00:26:35 -07:00
net net: atm: use DEVICE_ATTR_RO macro 2021-05-20 15:50:54 -07:00
samples samples, bpf: Suppress compiler warning 2021-05-12 12:29:43 -07:00
scripts Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
security Simple code cleanup 2021-05-05 12:08:06 -07:00
sound sound fixes for 5.13-rc1 2021-05-07 11:40:18 -07:00
tools selftests: net: devlink_port_split.py: skip the test if no devlink device 2021-05-20 15:46:57 -07:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
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COPYING
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
Kbuild
Kconfig
MAINTAINERS net: phy: add driver for Motorcomm yt8511 phy 2021-05-21 13:19:11 -07:00
Makefile Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
README

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.