Re: [PATCH RFC] net: sfp: support assigning status LEDs to SFP connectors

[Ioana Ciornei <ioana.ciornei@nxp.com>]

On Tue, May 10, 2022 at 12:44:41PM +0300, Josua Mayer wrote:

> One issue is that the interfaces don't have stable names. It purely depends
> on probe order,
> which is controlled by sending commands to the networking coprocessor.
> 
> We actually get asked this question sometimes how to have stable device
> names, and so far the answer has been systemd services with explicit sleep
> to force the order.
> But this is a different topic.
> 

Stable names can be achieved using some udev rules based on the OF node.
For example, I am using the following rules on a Clearfog CX LX2:

[root@clearfog-cx-lx2 ~] # cat /etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="fsl_dpaa2_eth", ENV{OF_FULLNAME}=="/soc/fsl-mc@80c000000/dpmacs/ethernet@7", NAME="eth7"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="fsl_dpaa2_eth", ENV{OF_FULLNAME}=="/soc/fsl-mc@80c000000/dpmacs/ethernet@8", NAME="eth8"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="fsl_dpaa2_eth", ENV{OF_FULLNAME}=="/soc/fsl-mc@80c000000/dpmacs/ethernet@9", NAME="eth9"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="fsl_dpaa2_eth", ENV{OF_FULLNAME}=="/soc/fsl-mc@80c000000/dpmacs/ethernet@a", NAME="eth10"
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="fsl_dpaa2_eth", ENV{OF_FULLNAME}=="/soc/fsl-mc@80c000000/dpmacs/ethernet@11", NAME="eth17"

Ioana