netdev - Re: [PATH v4 3/3] vdpa/mlx5: Add the support of set mac address

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Message-ID: <7a4d99e0f16cbe91000c3c780334a4c866904182.camel@nvidia.com>
Date: Mon, 22 Jul 2024 09:45:43 +0000
From: Dragos Tatulea <dtatulea@...dia.com>
To: "lulu@...hat.com" <lulu@...hat.com>, "jasowang@...hat.com"
	<jasowang@...hat.com>
CC: "sgarzare@...hat.com" <sgarzare@...hat.com>, Parav Pandit
	<parav@...dia.com>, "mst@...hat.com" <mst@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org"
	<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATH v4 3/3] vdpa/mlx5: Add the support of set mac address

On Mon, 2024-07-22 at 15:48 +0800, Jason Wang wrote:
> On Mon, Jul 22, 2024 at 9:06 AM Cindy Lu <lulu@...hat.com> wrote:
> > 
> > Add the function to support setting the MAC address.
> > For vdpa/mlx5, the function will use mlx5_mpfs_add_mac
> > to set the mac address
> > 
> > Tested in ConnectX-6 Dx device
> > 
> > Signed-off-by: Cindy Lu <lulu@...hat.com>
> > ---
> >  drivers/vdpa/mlx5/net/mlx5_vnet.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index ecfc16151d61..415b527a9c72 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -3785,10 +3785,35 @@ static void mlx5_vdpa_dev_del(struct vdpa_mgmt_dev *v_mdev, struct vdpa_device *
> >         destroy_workqueue(wq);
> >         mgtdev->ndev = NULL;
> >  }
> > +static int mlx5_vdpa_set_attr(struct vdpa_mgmt_dev *v_mdev,
> > +                             struct vdpa_device *dev,
> > +                             const struct vdpa_dev_set_config *add_config)
> > +{
> > +       struct mlx5_vdpa_dev *mvdev;
> > +       struct mlx5_vdpa_net *ndev;
> > +       struct mlx5_core_dev *mdev;
> > +       struct virtio_net_config *config;
> > +       struct mlx5_core_dev *pfmdev;
Reverse xmas tree?

> > +       int err = -EOPNOTSUPP;
> > +
> > +       mvdev = to_mvdev(dev);
> > +       ndev = to_mlx5_vdpa_ndev(mvdev);
> > +       mdev = mvdev->mdev;
> > +       config = &ndev->config;
> > +
You still need to take the ndev->reslock.

> > +       if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
> > +               pfmdev = pci_get_drvdata(pci_physfn(mdev->pdev));
> > +               err = mlx5_mpfs_add_mac(pfmdev, config->mac);
> > +               if (!err)
> > +                       memcpy(config->mac, add_config->net.mac, ETH_ALEN);
What is the expected behaviour when the device is in use?

> > +       }
> > +       return err;
> 
> Similar to net simulator, how could be serialize the modification to
> mac address:
> 
> 1) from vdpa tool
> 2) via control virtqueue
> 
> Thanks
> 
> > +}
> > 
> >  static const struct vdpa_mgmtdev_ops mdev_ops = {
> >         .dev_add = mlx5_vdpa_dev_add,
> >         .dev_del = mlx5_vdpa_dev_del,
> > +       .dev_set_attr = mlx5_vdpa_set_attr,
> >  };
> > 
> >  static struct virtio_device_id id_table[] = {
> > --
> > 2.45.0
> > 
> 
Thanks,
Dragos