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

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Message-ID: <CACGkMEt6S7MCJCbyfaDRj+FPfV0uUYDTbeVzgnyqkOR2YPtt1w@mail.gmail.com>
Date: Tue, 23 Jul 2024 09:29:15 +0800
From: Jason Wang <jasowang@...hat.com>
To: Dragos Tatulea <dtatulea@...dia.com>
Cc: "lulu@...hat.com" <lulu@...hat.com>, "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, Jul 22, 2024 at 5:45 PM Dragos Tatulea <dtatulea@...dia.com> wrote:
>
> 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?

Should be a fault of the mgmt layer, so I think we probably don't need
to worry about that.

Thanks

>
> > > +       }
> > > +       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