netdev - Re: Exposing device ACL setting through devlink

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Message-ID: <447a0b01-bd40-35f5-cdfc-babdc2a968e5@linux.ibm.com>
Date:   Wed, 23 Sep 2020 12:01:15 -0500
From:   Thomas Falcon <tlfalcon@...ux.ibm.com>
To:     Jakub Kicinski <kuba@...nel.org>, Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, jiri@...dia.com
Subject: Re: Exposing device ACL setting through devlink


On 9/21/20 3:37 PM, Jakub Kicinski wrote:
> On Sun, 20 Sep 2020 17:21:36 +0200 Jiri Pirko wrote:
>>> Yes, this the filtering is done on a virtual switch in Power firmware. I am
>>> really just trying to report the ACL list's configured at the firmware level
>>> to users on the guest OS.
>> We have means to model switches properly in linux and offload to them.
>> I advise you to do that.
> I think it may have gotten lost in the conversation, but Tom is after
> exposing the information to the client side of the switch. AFAIU we
> don't have anything like that right now, perhaps the way to go is to
> expose enum devlink_port_function_attr on the client side?
>
> Still - it feels hacky when I think about it.
>
> IMHO kernel device APIs are not the place to expose network config.
> It's not like MVRP results pop up as a netdev attribute.
>
> Tomorrow Amazon, Google, and all other cloud providers will want to
> expose some other info, and we'll have to worry about how to make it
> common, drawing the lines, reviewing etc.
>
> Tom, is there no way higher layer (cloud) APIs can be used to
> communicate this information to the guest?

None that I know of, Jakub. As far as I know, this information can only 
be retrieved through the device driver if the user only has access to 
the guest.

Tom