netdev - RE: [PATCH net-next 1/2] devlink: Add support to set port function as trusted

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Message-ID: <PH0PR12MB5481E3E9D38D0F8DE175A915DC519@PH0PR12MB5481.namprd12.prod.outlook.com>
Date:   Tue, 11 Jan 2022 19:39:37 +0000
From:   Parav Pandit <parav@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Sunil Sudhakar Rani <sunrani@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Jiri Pirko <jiri@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Bodong Wang <bodong@...dia.com>
Subject: RE: [PATCH net-next 1/2] devlink: Add support to set port function as
 trusted


> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Wednesday, January 12, 2022 12:54 AM
> 
> On Tue, 11 Jan 2022 18:26:16 +0000 Parav Pandit wrote:
> > > From: Jakub Kicinski <kuba@...nel.org>
> > > Sent: Tuesday, January 11, 2022 11:50 PM
> > > > This discussed got paused in yet another year-end holidays. :)
> > > > Resuming now and refreshing everyone's cache.
> > > >
> > > > We need to set/clear the capabilities of the function before
> > > > deploying such function. As you suggested we discussed the
> > > > granular approach and at present we have following features to on/off.
> > > >
> > > > Generic features:
> > > > 1. ipsec offload
> > >
> > > Why is ipsec offload a trusted feature?
> >
> > It isn't trusted feature. The scope in few weeks got expanded from
> > trusted to more granular at controlling capabilities. One that came up
> > was ipsec or other offloads that consumes more device resources.
> 
> That's what I thought. Resource control is different than privileges, and
> requires a different API.
>
It's the capability that is turned on/off.
A device is composed based on what is needed. ipsec offload is not always needed.
Its counter intuitive to expose some low level hardware resource to disable ipsec indirectly.
So it is better to do as capability/param rather than some resource.
It is capability is more than just resource.

> > > > 2. ptp device
> > >
> > > Makes sense.
> > >
> > > > Device specific:
> > > > 1. sw steering
> > >
> > > No idea what that is/entails.
> > >
> > :) it the device specific knob.
> >
> > > > 2. physical port counters query
> > >
> > > Still don't know why VF needs to know phy counters.
> >
> > A prometheous kind of monitoring software wants to monitor the
> > physical port counters, running in a container. Such container doesn't
> > have direct access to the PF or physical representor. Just for sake of
> > monitoring counters, user doesn't want to run the monitoring container
> > in root net ns.
> 
> Containerizing monitors seems very counter-intuitive to me.
>
May be. But it is in use at [1] for a long time now.

[1] docker run -p 9090:9090 prom/prometheus
 
> > > > It was implicit that a driver API callback addition for both types
> > > > of features is not good.
> > > > Devlink port function params enables to achieve both generic and
> > > > device specific features.
> > > > Shall we proceed with port function params? What do you think?
> > >
> > > I already addressed this. I don't like devlink params. They muddy
> > > the water between vendor specific gunk and bona fide Linux uAPI.
> > > Build a normal dedicated API.
> > For sure we prefer the bona fide Linux uAPI for standard features.
> > But internal knobs of how to do steering etc, is something not generic
> > enough. May be only those quirks live in the port function params and
> > rest in standard uAPIs?
> 
> Something talks to that steering API, and it's not netdev. So please don't push
> problems which are not ours onto us.
Not sure I follow you.
Netdev of a mlx5 function talks to the driver internal steering API in addition to other drivers operating this mlx5 function.