From: Parav Pandit <email@example.com> To: Jakub Kicinski <firstname.lastname@example.org>, Jason Gunthorpe <email@example.com> Cc: Saeed Mahameed <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org>, Jiri Pirko <email@example.com>, "firstname.lastname@example.org" <email@example.com>, Leon Romanovsky <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org> Subject: RE: [PATCH net-next 00/13] Add mlx5 subfunction support Date: Fri, 20 Nov 2020 03:50:34 +0000 [thread overview] Message-ID: <BY5PR12MB4322FD44A4CF021627A9E841DCFF0@BY5PR12MB4322.namprd12.prod.outlook.com> (raw) In-Reply-To: <20201119193526.014b968b@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net> > From: Jakub Kicinski <email@example.com> > Sent: Friday, November 20, 2020 9:05 AM > > On Thu, 19 Nov 2020 10:00:17 -0400 Jason Gunthorpe wrote: > > Finally, in the mlx5 model VDPA is just an "application". It asks the > > device to create a 'RDMA' raw ethernet packet QP that is uses rings > > formed in the virtio-net specification. We can create it in the kernel > > using mlx5_vdpa, and we can create it in userspace through the RDMA > > subsystem. Like any "RDMA" application it is contained by the security > > boundary of the PF/VF/SF the mlx5_core is running on. > > Thanks for the write up! > > The SF part is pretty clear to me, it is what it is. DPDK camp has been pretty > excited about ADI/PASID for a while now. > > > The part that's blurry to me is VDPA. > > I was under the impression that for VDPA the device is supposed to support > native virtio 2.0 (or whatever the "HW friendly" spec was). > > I believe that's what the early patches from Intel did. > > You're saying it's a client application like any other - do I understand it right that > the hypervisor driver will be translating descriptors between virtio and device- > native then? > mlx5 device support virtio descriptors natively. So no need of translation. > The vdpa parent is in the hypervisor correct? > Yep. > Can a VDPA device have multiple children of the same type? > I guess, you mean VDPA parentdev? If so, yes, however at present we see only one_to_one mapping of vdpa device and parent dev. > Why do we have a representor for a SF, if the interface is actually VDPA? Because vdpa is just one client out of multiple. At the moment there is one to one relation of vdpa device to a SF/VF. > Block and net traffic can't reasonably be treated the same by the switch. > > Also I'm confused how block device can bind to mlx5_core - in that case I'm > assuming the QP is bound 1:1 with a QP on the SmartNIC side, and that QP is > plugged into an appropriate backend? So far there isn't mlx5_vdpa.ko or plan to do block. But yes, in future for block, it needs to bind to a QP in backend in smartnic.
next prev parent reply other threads:[~2020-11-20 3:51 UTC|newest] Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-12 19:24 Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 01/13] devlink: Prepare code to fill multiple port function attributes Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 02/13] devlink: Introduce PCI SF port flavour and port attribute Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 03/13] devlink: Support add and delete devlink port Parav Pandit 2020-11-18 16:21 ` David Ahern 2020-11-18 17:02 ` Parav Pandit 2020-11-18 18:03 ` David Ahern 2020-11-18 18:38 ` Jason Gunthorpe 2020-11-18 19:36 ` David Ahern 2020-11-18 20:42 ` Jason Gunthorpe 2020-11-18 19:22 ` Parav Pandit 2020-11-19 0:41 ` Jacob Keller 2020-11-19 1:17 ` David Ahern 2020-11-19 1:56 ` Samudrala, Sridhar 2020-11-19 0:52 ` Jacob Keller 2020-11-12 19:24 ` [PATCH net-next 04/13] devlink: Support get and set state of port function Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 05/13] devlink: Avoid global devlink mutex, use per instance reload lock Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 06/13] devlink: Introduce devlink refcount to reduce scope of global devlink_mutex Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 07/13] net/mlx5: SF, Add auxiliary device support Parav Pandit 2020-12-07 2:48 ` David Ahern 2020-12-07 4:53 ` Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 08/13] net/mlx5: SF, Add auxiliary device driver Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 09/13] net/mlx5: E-switch, Prepare eswitch to handle SF vport Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 10/13] net/mlx5: E-switch, Add eswitch helpers for " Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 11/13] net/mlx5: SF, Add SF configuration hardware commands Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 12/13] net/mlx5: SF, Add port add delete functionality Parav Pandit 2020-11-12 19:24 ` [PATCH net-next 13/13] net/mlx5: SF, Port function state change support Parav Pandit 2020-11-16 22:52 ` [PATCH net-next 00/13] Add mlx5 subfunction support Jakub Kicinski 2020-11-17 0:06 ` Saeed Mahameed 2020-11-17 1:58 ` Jakub Kicinski 2020-11-17 4:08 ` Parav Pandit 2020-11-17 17:11 ` Jakub Kicinski 2020-11-17 18:49 ` Jason Gunthorpe 2020-11-19 2:14 ` Jakub Kicinski 2020-11-19 4:35 ` David Ahern 2020-11-19 5:57 ` Saeed Mahameed 2020-11-20 1:31 ` Jakub Kicinski 2020-11-25 5:33 ` David Ahern 2020-11-25 6:00 ` Parav Pandit 2020-11-25 14:37 ` David Ahern 2020-11-20 1:29 ` Jakub Kicinski 2020-11-20 17:58 ` Alexander Duyck 2020-11-20 19:04 ` Samudrala, Sridhar 2020-11-23 21:51 ` Saeed Mahameed 2020-11-24 7:01 ` Jason Wang 2020-11-24 7:05 ` Jason Wang 2020-11-19 6:12 ` Saeed Mahameed 2020-11-19 8:25 ` Parav Pandit 2020-11-20 1:35 ` Jakub Kicinski 2020-11-20 3:34 ` Parav Pandit 2020-11-17 18:50 ` Parav Pandit 2020-11-19 2:23 ` Jakub Kicinski 2020-11-19 6:22 ` Saeed Mahameed 2020-11-19 14:00 ` Jason Gunthorpe 2020-11-20 3:35 ` Jakub Kicinski 2020-11-20 3:50 ` Parav Pandit [this message] 2020-11-20 16:16 ` Jason Gunthorpe
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