netdev - Re: [patch net-next 3/9] mlx4: Implement port type setting via devlink interface

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Date:	Tue, 23 Feb 2016 17:04:58 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
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 3/9] mlx4: Implement port type setting via
 devlink interface

Tue, Feb 23, 2016 at 04:57:17PM CET, hannes@...essinduktion.org wrote:
>On 23.02.2016 16:30, Jiri Pirko wrote:
>>Tue, Feb 23, 2016 at 04:16:11PM CET, hannes@...essinduktion.org wrote:
>>
>><snip>
>>
>>>>>1) is easily solvable, just drop the ifindex style attributes and always
>>>>>force the user to enter the bus and bus-topology id.
>>>>
>>>>But why? Use can easily get that info and map it to devlink index. It
>>>>aligns with nl80211 iface.
>>>>
>>>>Do you really want to do commands like:
>>>>myhost:~$ dl dev show pci_0000:01:00.0
>>>>?
>>>
>>>Yes, exactly I would. I would put them into a boot-up script based on my
>>>system configuration and can be sure it will work the next boot, too, and
>>>adapt them when I replace the hardware or do some configuration changes.
>>>
>>>I think sysadmins or scripts are the primary users of this interface not
>>>kernel developers which switch their settings around all the time, no?
>>
>>I can easily add this to the userspace tool to accept "pci_0000:01:00.0"
>>format and to map it internally to devlink index. No problem.
>
>I argue for this stable topology identifier to be the default. Especially if
>you add device info before the actual module is loaded (this is during
>initramfs, when udev cannot rename devlink names to stable ones), a user has
>to deal with pre-devlink-ids before rename and after. Do you have plans how
>to address that?

You can still access devlink using pci_addr using dl. I don't see a
problem.


>
>Current initramfs for stable interface names uses EUI48 based mac addresses
>most of the time and udev runs then after the pivot_root.
>
>The devlink names can easily be aliases in user space.

I don't want to store them anywhere. I just use "dl" tool and pass the
name there.


>
>Bye,
>Hannes
>
>