linux-kernel - Re: [PATCH v3 0/2] vdpa: support set mac address from vdpa tool

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Message-ID: <20240710020852-mutt-send-email-mst@kernel.org>
Date: Wed, 10 Jul 2024 02:10:37 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: Cindy Lu <lulu@...hat.com>, Parav Pandit <parav@...dia.com>,
	Dragos Tatulea <dtatulea@...dia.com>,
	"sgarzare@...hat.com" <sgarzare@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	Leonardo Milleri <lmilleri@...hat.com>
Subject: Re: [PATCH v3 0/2] vdpa: support set mac address from vdpa tool

On Wed, Jul 10, 2024 at 11:05:48AM +0800, Jason Wang wrote:
> On Tue, Jul 9, 2024 at 8:42 PM Michael S. Tsirkin <mst@...hat.com> wrote:
> >
> > On Tue, Jul 09, 2024 at 02:19:19PM +0800, Cindy Lu wrote:
> > > On Tue, 9 Jul 2024 at 11:59, Parav Pandit <parav@...dia.com> wrote:
> > > >
> > > > Hi Cindy,
> > > >
> > > > > From: Cindy Lu <lulu@...hat.com>
> > > > > Sent: Monday, July 8, 2024 12:17 PM
> > > > >
> > > > > Add support for setting the MAC address using the VDPA tool.
> > > > > This feature will allow setting the MAC address using the VDPA tool.
> > > > > For example, in vdpa_sim_net, the implementation sets the MAC address to
> > > > > the config space. However, for other drivers, they can implement their own
> > > > > function, not limited to the config space.
> > > > >
> > > > > Changelog v2
> > > > >  - Changed the function name to prevent misunderstanding
> > > > >  - Added check for blk device
> > > > >  - Addressed the comments
> > > > > Changelog v3
> > > > >  - Split the function of the net device from vdpa_nl_cmd_dev_attr_set_doit
> > > > >  - Add a lock for the network device's dev_set_attr operation
> > > > >  - Address the comments
> > > > >
> > > > > Cindy Lu (2):
> > > > >   vdpa: support set mac address from vdpa tool
> > > > >   vdpa_sim_net: Add the support of set mac address
> > > > >
> > > > >  drivers/vdpa/vdpa.c                  | 81 ++++++++++++++++++++++++++++
> > > > >  drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 19 ++++++-
> > > > >  include/linux/vdpa.h                 |  9 ++++
> > > > >  include/uapi/linux/vdpa.h            |  1 +
> > > > >  4 files changed, 109 insertions(+), 1 deletion(-)
> > > > >
> > > > > --
> > > > > 2.45.0
> > > >
> > > > Mlx5 device already allows setting the mac and mtu during the vdpa device creation time.
> > > > Once the vdpa device is created, it binds to vdpa bus and other driver vhost_vdpa etc bind to it.
> > > > So there was no good reason in the past to support explicit config after device add complicate the flow for synchronizing this.
> > > >
> > > > The user who wants a device with new attributes, as well destroy and recreate the vdpa device with new desired attributes.
> > > >
> > > > vdpa_sim_net can also be extended for similar way when adding the vdpa device.
> > > >
> > > > Have you considered using the existing tool and kernel in place since 2021?
> > > > Such as commit d8ca2fa5be1.
> > > >
> > > > An example of it is,
> > > > $ vdpa dev add name bar mgmtdev vdpasim_net mac 00:11:22:33:44:55 mtu 9000
> > > >
> > > Hi Parav
> > > Really thanks for your comments. The reason for adding this function
> > > is to support Kubevirt.
> > > the problem we meet is that kubevirt chooses one random vdpa device
> > > from the pool and we don't know which one it going to pick. That means
> > > we can't get to know the Mac address before it is created. So we plan
> > > to have this function to change the mac address after it is created
> > > Thanks
> > > cindy
> >
> > Well you will need to change kubevirt to teach it to set
> > mac address, right?
> 
> That's the plan. Adding Leonardo.
> 
> Thanks

So given you are going to change kubevirt, can we
change it to create devices as needed with the
existing API?

> >
> > --
> > MST
> >