Re: [PATCH 0/3] Fix for KSZ DSA switch shutdown

From: Vladimir Oltean
Date: Thu Sep 09 2021 - 10:23:51 EST

On Thu, Sep 09, 2021 at 02:42:48PM +0300, Vladimir Oltean wrote:
> I feel that something is missing in your system. Is the device link
> created? Is it deleted before going into effect on shutdown?

So in case my questions were confusing, you can check the presence of
the device links via sysfs.

On my board, eno2 is the top-level DSA master, there is a switch which
is PCIe PF 0000:00:00.5 which is its consumer:

ls -la /sys/class/net/eno2/device/consumer\:pci\:0000\:00\:00.5
lrwxrwxrwx 1 root root 0 Jan 1 00:00 /sys/class/net/eno2/device/consumer:pci:0000:00:00.5 -> ../../../../../virtual/devlink/pci:0000:00:00.2--pci:0000:00:00.5

In turn, that switch is a DSA master on two ports for SPI-attached switches:

ls -la /sys/class/net/swp0/device/consumer\:spi\:spi2.*
lrwxrwxrwx 1 root root 0 Jan 1 00:04 /sys/class/net/swp0/device/consumer:spi:spi2.0 -> ../../../../../virtual/devlink/pci:0000:00:00.5--spi:spi2.0
lrwxrwxrwx 1 root root 0 Jan 1 00:04 /sys/class/net/swp0/device/consumer:spi:spi2.1 -> ../../../../../virtual/devlink/pci:0000:00:00.5--spi:spi2.1

Do you see similar things on your 5.10 kernel?

Please note that I don't think that particular patch with device links
was backported to v5.10, at least I don't see it when I run:

git tag --contains 07b90056cb15f

So how did it reach your tree?