netdev - Re: [PATCH net-next 00/19] Mellanox, mlx5 sub function support

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Date:   Sat, 9 Nov 2019 09:41:03 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Parav Pandit <parav@...lanox.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jiri Pirko <jiri@...nulli.us>,
        David M <david.m.ertman@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Or Gerlitz <gerlitz.or@...il.com>,
        "Jason Wang (jasowang@...hat.com)" <jasowang@...hat.com>
Subject: Re: [PATCH net-next 00/19] Mellanox, mlx5 sub function support

On Fri, 8 Nov 2019 20:57:08 -0400, Jason Gunthorpe wrote:
> On Fri, Nov 08, 2019 at 10:48:31PM +0000, Parav Pandit wrote:
> > We should be creating 3 different buses, instead of mdev bus being de-multiplexer of that?
> > 
> > Hence, depending the device flavour specified, create such device on right bus?
> > 
> > For example,
> > $ devlink create subdev pci/0000:05:00.0 flavour virtio name foo subdev_id 1
> > $ devlink create subdev pci/0000:05:00.0 flavour mdev <uuid> subdev_id 2
> > $ devlink create subdev pci/0000:05:00.0 flavour mlx5 id 1 subdev_id 3  
> 
> I like the idea of specifying what kind of interface you want at sub
> device creation time. It fits the driver model pretty well and doesn't
> require abusing the vfio mdev for binding to a netdev driver.

Aren't the HW resources spun out in all three cases exactly identical?

IMHO creation of sub device should only define which HW resources are
provisioned/relegated. Specifying a driver when recreating a device
seems a little backwards.