Re: [PATCH net-next v2 01/10] net: dsa: add debugfs interface

On 08/28/2017 12:50 PM, Jiri Pirko wrote:

Mon, Aug 28, 2017 at 09:17:39PM CEST, vivien.didelot@savoirfairelinux.com wrote:

quoted

This commit adds a DEBUG_FS dependent DSA core file creating a generic
debug filesystem interface for the DSA switch devices.

The interface can be mounted with:

   # mount -t debugfs none /sys/kernel/debug

The dsa directory contains one directory per switch chip:

   # cd /sys/kernel/debug/dsa/
   # ls
   switch0  switch1 switch2

Each chip directory contains one directory per port:

   # ls -l switch0/
   drwxr-xr-x 2 root root 0 Jan  1 00:00 port0
   drwxr-xr-x 2 root root 0 Jan  1 00:00 port1
   drwxr-xr-x 2 root root 0 Jan  1 00:00 port2
   drwxr-xr-x 2 root root 0 Jan  1 00:00 port5
   drwxr-xr-x 2 root root 0 Jan  1 00:00 port6

Future patches will add entry files to these directories.

Signed-off-by: Vivien Didelot <redacted>

Oh no, no debugfs please!

What do you need to expose? I'm sure we can find out some generic, well
defined and reusable way.

We have no CPU or DSA (cross switches) net_device reprensentors because
those would be two ends of the same pipe so it would be both confusing
and a duplication. For a CPU interface, one side goes to the switch, the
other one is the master net_device (normal Ethernet MAC). For a DSA
interface, one interface is on one switch, and the other is on the other
switch.

If you look at the patch series it's pretty obvious what is being exposed :)
-- 
Florian