netdev - Re: [patch net-next 0/9] Introduce devlink interface and first drivers to use it

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Date:	Tue, 23 Feb 2016 15:45:51 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
	eladr@...lanox.com, yotamg@...lanox.com, ogerlitz@...lanox.com,
	yishaih@...lanox.com, dledford@...hat.com, sean.hefty@...el.com,
	hal.rosenstock@...il.com, eugenia@...lanox.com,
	roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
	hadarh@...lanox.com, jhs@...atatu.com, john.fastabend@...il.com,
	jeffrey.t.kirsher@...el.com, brouer@...hat.com, ivecera@...hat.com,
	rami.rosen@...el.com
Subject: Re: [patch net-next 0/9] Introduce devlink interface and first
 drivers to use it

Tue, Feb 23, 2016 at 03:34:19PM CET, gospo@...ulusnetworks.com wrote:

<snip>
>> 
>> >> 	myhost:~$ dl port show
>> >> 	devlink0/1: type eth netdev ens4
>> >                             ^^^^^^^^^^^
>> >> 	devlink0/2: type ib ibdev mlx4_0
>> >                            ^^^^^^^^^^^^
>> >I think my only other question about this implementation is whether or
>> >not one would really want to have the true netdev/ibdev names mapped
>> >here.
>> >
>> >Would be as reasonable to simply specify the type (and there may be more
>> >types within ethernet that could be useful in multi-chip configurations)
>> >and then let normal infrastructure that exists today figure out how to
>> >map the names for the netdevs to the devices?
>> 
>> What normal infrastructure you have in mind? There is no info about
>> devlink port mapping to netdev/ibdev anywhere. Only here. I might be
>> missing something but I fail to see what's wrong with it.
>
>I was simply wondering out loud if we _really_ wanted to name netdevs
>this way.  I was suggesting that output could be like this:
>
>myhost:~$ dl port show
>devlink0/1: type eth
>devlink0/2: type ib 
>
>mnd that udev/systemd/biosdevname/etc would take care of naming the
>device whataever it wanted.  This appears to be essentially the same
>concern Hannes has.

Wait. The only thing which will be renamed by udev is "devlink0". The
suffixes "/1" and "/2" are direct indexes as used inside the driver.

And you need some link to netdev in case netdev exists - therefore
"netdev ens4" attribute is there. There's no other way to get the
mapping of "devlink0/1" to "ens4" anywhere else.