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From: Saeed Mahameed <saeed@kernel.org>
To: Jakub Kicinski <kuba@kernel.org>, Parav Pandit <parav@nvidia.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	Jiri Pirko <jiri@nvidia.com>, Jason Gunthorpe <jgg@nvidia.com>,
	"dledford@redhat.com" <dledford@redhat.com>,
	Leon Romanovsky <leonro@nvidia.com>,
	"davem@davemloft.net" <davem@davemloft.net>
Subject: Re: [PATCH net-next 00/13] Add mlx5 subfunction support
Date: Wed, 18 Nov 2020 22:22:51 -0800	[thread overview]
Message-ID: <28239ff66a27c0ddf8be4f1461e27b0ac0b02871.camel@kernel.org> (raw)
In-Reply-To: <20201118182319.7bad1ca6@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>

On Wed, 2020-11-18 at 18:23 -0800, Jakub Kicinski wrote:
> On Tue, 17 Nov 2020 18:50:57 +0000 Parav Pandit wrote:
> > At this point vdpa tool of [1] can create one or more vdpa net
> > devices on this subfunction device in below sequence.
> > 
> > $ vdpa parentdev list
> > auxiliary/mlx5_core.sf.4
> >   supported_classes
> >     net
> > 
> > $ vdpa dev add parentdev auxiliary/mlx5_core.sf.4 type net name
> > foo0
> > 
> > $ vdpa dev show foo0
> > foo0: parentdev auxiliary/mlx5_core.sf.4 type network parentdev
> > vdpasim vendor_id 0 max_vqs 2 max_vq_size 256
> > 
> > > I'm asking how the vdpa API fits in with this, and you're showing
> > > me the two
> > > devlink commands we already talked about in the past.  
> > Oh ok, sorry, my bad. I understood your question now about relation
> > of vdpa commands with this.
> > Please look at the above example sequence that covers the vdpa
> > example also.
> > 
> > [1] 
> > https://lore.kernel.org/netdev/20201112064005.349268-1-parav@nvidia.com/
> 
> I think the biggest missing piece in my understanding is what's the
> technical difference between an SF and a VDPA device.
> 

Same difference as between a VF and netdev.
SF == VF, so a full HW function.
VDPA/RDMA/netdev/SCSI/nvme/etc.. are just interfaces (ULPs) sharing the
same functions as always been, nothing new about this.

Today on a VF we load a RDMA/VDPA/netdev interfaces
SF will do exactly the same and the ULPs will simply load, and we don't
need to modify them.

> Isn't a VDPA device an SF with a particular descriptor format for the
> queues?
No :/, 
I hope the above answer clarifies things a bit.
SF is a device function that provides all kinds of queues.



  reply	other threads:[~2020-11-19  6:22 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 [this message]
2020-11-19 14:00                 ` Jason Gunthorpe
2020-11-20  3:35                   ` Jakub Kicinski
2020-11-20  3:50                     ` Parav Pandit
2020-11-20 16:16                     ` Jason Gunthorpe

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