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[73.202.202.92]) by smtp.gmail.com with ESMTPSA id a23sm5103400pjv.26.2019.11.09.09.41.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 Nov 2019 09:41:07 -0800 (PST) Date: Sat, 9 Nov 2019 09:41:03 -0800 From: Jakub Kicinski To: Jason Gunthorpe Cc: Parav Pandit , Alex Williamson , Jiri Pirko , David M , "gregkh@linuxfoundation.org" , "davem@davemloft.net" , "kvm@vger.kernel.org" , "netdev@vger.kernel.org" , Saeed Mahameed , "kwankhede@nvidia.com" , "leon@kernel.org" , "cohuck@redhat.com" , Jiri Pirko , "linux-rdma@vger.kernel.org" , Or Gerlitz , "Jason Wang (jasowang@redhat.com)" Subject: Re: [PATCH net-next 00/19] Mellanox, mlx5 sub function support Message-ID: <20191109094103.739033a3@cakuba> In-Reply-To: <20191109005708.GC31761@ziepe.ca> References: <20191107153234.0d735c1f@cakuba.netronome.com> <20191108121233.GJ6990@nanopsycho> <20191108144054.GC10956@ziepe.ca> <20191108111238.578f44f1@cakuba> <20191108201253.GE10956@ziepe.ca> <20191108133435.6dcc80bd@x1.home> <20191108210545.GG10956@ziepe.ca> <20191108145210.7ad6351c@x1.home> <20191109005708.GC31761@ziepe.ca> Organization: Netronome Systems, Ltd. MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 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.