netdev - Re: [PATCH] net-sysfs: allow changing sysfs carrier when interface is down

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Date:   Thu, 2 Jun 2022 10:52:15 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Joakim Tjernlund <Joakim.Tjernlund@...inera.com>
Cc:     "stephen@...workplumber.org" <stephen@...workplumber.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] net-sysfs: allow changing sysfs carrier when interface
 is down

On Thu, 2 Jun 2022 17:15:13 +0000 Joakim Tjernlund wrote:
> > What is "our HW", what kernel driver does it use and why can't the
> > kernel driver take care of making sure the device is not accessed
> > when it'd crash the system?  
> 
> It is a custom asic with some homegrown controller. The full config path is too complex for kernel too
> know and depends on user input.

We have a long standing tradition of not caring about user space
drivers in netdev land. I see no reason to merge this patch upstream.

> > > Maybe so but it seems to me that this limitation was put in place without much thought.  
> > 
> > Don't make unnecessary disparaging statements about someone else's work.
> > Whoever that person was.  
> 
> That was not meant the way you read it, sorry for being unclear.
> The commit from 2012 simply says:
> net: allow to change carrier via sysfs
>     
>     Make carrier writable

Yeah, IIUC the interface was created for software devices.