netdev - Re: [PATCH v5 net-next 1/4] rtnetlink: return ENODEV when ifname does not exist and group is given

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Date:   Tue, 19 Apr 2022 08:04:15 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Florent Fourcot <florent.fourcot@...irst.fr>
Cc:     netdev@...r.kernel.org, cong.wang@...edance.com,
        edumazet@...gle.com, Brian Baboch <brian.baboch@...irst.fr>
Subject: Re: [PATCH v5 net-next 1/4] rtnetlink: return ENODEV when ifname
 does not exist and group is given

On Tue, 19 Apr 2022 09:29:37 +0200
Florent Fourcot <florent.fourcot@...irst.fr> wrote:

> Hello,
> 
> 
> >> +		if (link_specified)
> >> +			return -ENODEV;  
> > 
> > Please add extack error message as well?
> > Simple errno's are harder to debug.  
> 
> 
> What kind of message have you in mind for that one? Something like 
> "Interface not found" does not have extra information for ENODEV code.
> 
> At this place, one gave interface index or interface name, and nothing 
> matched.

Not sure how code gets here. Maybe "interface name required"