linux-kernel - Re: drivers/net/dsa/dsa_loop

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Date: Tue, 14 May 2024 10:28:55 +0100
From: Stephen Langstaff <stephenlangstaff1@...il.com>
To: Florian Fainelli <f.fainelli@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org, OlteanV@...il.com
Subject: Re: drivers/net/dsa/dsa_loop_bdinfo.c build problems

On Mon, May 13, 2024 at 8:05 PM Florian Fainelli <f.fainelli@...il.com> wrote:
> Attached is a configuration that I use on a x86-64 VM for testing that
> is started with:

That's kind of what I expect to be happening on my target, but it's not.

I notice that your configuration does not define CONFIG_FIXED_PHY as
either a module or built-in - could that explain both the fact that my
dsa_loop_bdinfo.c does not get compiled when using the default
Makefiles, and that if I force compilation to a module it does not
appear to create the expected lanX@...0 interfaces?

I have added some printk debug lines to the dsa_loop_init and
dsa_loop_drv_probe functions, and only see the one from the init
function, which makes me suspect that something is stopping the probe
from happening - I assume this should happen when the dsa_loop_bdinfo
module is inserted?

root@...hine:~/dsa_test# ls
dsa_loop.ko  dsa_loop_bdinfo.ko

root@...hine:~/dsa_test# modprobe dsa_core
root@...hine:~/dsa_test#

root@...hine:~/dsa_test# insmod dsa_loop_bdinfo.ko
[   51.742367] dsa_loop_bdinfo_init

root@...hine:~/dsa_test# insmod dsa_loop.ko
[   58.485104] dsa_loop_init

root@...hine:~/dsa_test# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP
mode DEFAULT group default qlen 1000
    link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state
DOWN mode DEFAULT group default qlen 1000
    link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
4: can0: <NOARP,ECHO> mtu 16 qdisc noop state DOWN mode DEFAULT group
default qlen 10
    link/can