netdev - Re: [RFC PATCH net-next 08/19] pds_core: initial VF configuration

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Date:   Mon, 28 Nov 2022 15:37:19 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Shannon Nelson <shnelson@....com>
Cc:     Shannon Nelson <snelson@...sando.io>, netdev@...r.kernel.org,
        davem@...emloft.net, mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org, drivers@...sando.io
Subject: Re: [RFC PATCH net-next 08/19] pds_core: initial VF configuration

On Mon, 28 Nov 2022 14:25:56 -0800 Shannon Nelson wrote:
> On 11/28/22 10:28 AM, Jakub Kicinski wrote:
> > On Fri, 18 Nov 2022 14:56:45 -0800 Shannon Nelson wrote:  
> >> +     .ndo_set_vf_vlan        = pdsc_set_vf_vlan,
> >> +     .ndo_set_vf_mac         = pdsc_set_vf_mac,
> >> +     .ndo_set_vf_trust       = pdsc_set_vf_trust,
> >> +     .ndo_set_vf_rate        = pdsc_set_vf_rate,
> >> +     .ndo_set_vf_spoofchk    = pdsc_set_vf_spoofchk,
> >> +     .ndo_set_vf_link_state  = pdsc_set_vf_link_state,
> >> +     .ndo_get_vf_config      = pdsc_get_vf_config,
> >> +     .ndo_get_vf_stats       = pdsc_get_vf_stats,  
> > 
> > These are legacy, you're adding a fancy SmartNIC (or whatever your
> > marketing decided to call it) driver. Please don't use these at all.  
> 
> Since these are the existing APIs that I am aware of for doing this kind 
> of VF configuration, it seemed to be the right choice.  I'm not aware of 
> any other obvious solutions.  Do you have an alternate suggestion?

If this is a "SmartNIC" there should be alternative solution based on
representors for each of those callbacks, and the device should support
forwarding using proper netdev constructs like bridge, routing, or tc.

This has been our high level guidance for a few years now. It's quite
hard to move the ball forward since all major vendors have a single
driver for multiple generations of HW :(