netdev - RE: [PATCH] vdpa/mlx5: Add the support of set mac address

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Message-ID:
 <PH0PR12MB5481507DD48109352EB422FCDCDB2@PH0PR12MB5481.namprd12.prod.outlook.com>
Date: Tue, 9 Jul 2024 04:03:37 +0000
From: Parav Pandit <parav@...dia.com>
To: Andrew Lunn <andrew@...n.ch>, Cindy Lu <lulu@...hat.com>
CC: Dragos Tatulea <dtatulea@...dia.com>, "mst@...hat.com" <mst@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.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>
Subject: RE: [PATCH] vdpa/mlx5: Add the support of set mac address

Hi Andrew,

> From: Andrew Lunn <andrew@...n.ch>
> Sent: Tuesday, July 9, 2024 12:31 AM
> To: Cindy Lu <lulu@...hat.com>
> Cc: Dragos Tatulea <dtatulea@...dia.com>; mst@...hat.com;
> jasowang@...hat.com; Parav Pandit <parav@...dia.com>;
> sgarzare@...hat.com; netdev@...r.kernel.org; virtualization@...ts.linux-
> foundation.org; linux-kernel@...r.kernel.org; kvm@...r.kernel.org
> Subject: Re: [PATCH] vdpa/mlx5: Add the support of set mac address
> 
> On Mon, Jul 08, 2024 at 02:55:49PM +0800, Cindy Lu 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 | 23 +++++++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> >
> > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > index 26ba7da6b410..f78701386690 100644
> > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> > @@ -3616,10 +3616,33 @@ 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_mac(struct vdpa_mgmt_dev *v_mdev,
> > +				  struct vdpa_device *dev,
> > +				  const struct vdpa_dev_set_config
> *add_config) {
> > +	struct mlx5_vdpa_dev *mvdev = to_mvdev(dev);
> > +	struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> > +	struct mlx5_core_dev *mdev = mvdev->mdev;
> > +	struct virtio_net_config *config = &ndev->config;
> > +	int err;
> > +	struct mlx5_core_dev *pfmdev;
> > +
> > +	if (add_config->mask & (1 <<
> VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
> > +		if (!is_zero_ether_addr(add_config->net.mac)) {
> 
> Is the core happy to call into the driver without validating the MAC address?
> Will the core pass the broadcast address? That is not zero. Or a multicast
> address? Should every driver repeat the same validation, and probably get it
> just as wrong?
> 
>     Andrew
> 
I will submit the patch to add the check in the vdpa core for mac address validation.

> ---
> pw-bot: cr