linux-kernel - Re: [PATH v5 1/3] vdpa: support set mac address from vdpa tool

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Message-ID: <8ff8f8d8-1061-42a2-b238-82f685639115@lunn.ch>
Date: Tue, 23 Jul 2024 20:48:21 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Cindy Lu <lulu@...hat.com>
Cc: dtatulea@...dia.com, mst@...hat.com, jasowang@...hat.com,
	parav@...dia.com, sgarzare@...hat.com, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATH v5 1/3] vdpa: support set mac address from vdpa tool

On Tue, Jul 23, 2024 at 01:39:20PM +0800, Cindy Lu wrote:
> Add new UAPI to support the mac address from vdpa tool
> Function vdpa_nl_cmd_dev_attr_set_doit() will get the
> new MAC address from the vdpa tool and then set it to the device.
> 
> The usage is: vdpa dev set name vdpa_name mac **:**:**:**:**:**
> 
> Here is example:
> root@L1# vdpa -jp dev config show vdpa0
> {
>     "config": {
>         "vdpa0": {
>             "mac": "82:4d:e9:5d:d7:e6",
>             "link ": "up",
>             "link_announce ": false,
>             "mtu": 1500
>         }
>     }
> }
> 
> root@L1# vdpa dev set name vdpa0 mac 00:11:22:33:44:55
> 
> root@L1# vdpa -jp dev config show vdpa0
> {
>     "config": {
>         "vdpa0": {
>             "mac": "00:11:22:33:44:55",
>             "link ": "up",
>             "link_announce ": false,
>             "mtu": 1500
>         }
>     }
> }
> 
> Signed-off-by: Cindy Lu <lulu@...hat.com>
> ---
>  drivers/vdpa/vdpa.c       | 84 +++++++++++++++++++++++++++++++++++++++
>  include/linux/vdpa.h      |  9 +++++
>  include/uapi/linux/vdpa.h |  1 +
>  3 files changed, 94 insertions(+)
> 
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 8d391947eb8d..07d61ee62839 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -1361,6 +1361,85 @@ static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info
>  	return err;
>  }
>  
> +static int vdpa_dev_net_device_attr_set(struct vdpa_device *vdev,
> +					struct genl_info *info)
> +{
> +	struct vdpa_dev_set_config set_config = {};
> +	const u8 *macaddr;
> +	struct vdpa_mgmt_dev *mdev = vdev->mdev;
> +	struct nlattr **nl_attrs = info->attrs;
> +	int err = -EINVAL;
> +
> +	if (!vdev->mdev)
> +		return -EINVAL;
> +
> +	down_write(&vdev->cf_lock);
> +	if ((mdev->supported_features & BIT_ULL(VIRTIO_NET_F_MAC)) &&
> +	    nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
> +		set_config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
> +		macaddr = nla_data(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
> +
> +		if (is_valid_ether_addr(macaddr)) {
> +			memcpy(set_config.net.mac, macaddr, ETH_ALEN);
> +			if (mdev->ops->dev_set_attr) {
> +				err = mdev->ops->dev_set_attr(mdev, vdev,
> +							      &set_config);
> +			} else {
> +				NL_SET_ERR_MSG_FMT_MOD(info->extack,
> +						       "device not supported");
> +			}
> +		} else {
> +			NL_SET_ERR_MSG_FMT_MOD(info->extack,
> +					       "Invalid MAC address");
> +		}
> +	}
> +	up_write(&vdev->cf_lock);
> +	return err;
> +}
> +static int vdpa_nl_cmd_dev_attr_set_doit(struct sk_buff *skb,
> +					 struct genl_info *info)
> +{
> +	const char *name;
> +	int err = 0;
> +	struct device *dev;
> +	struct vdpa_device *vdev;
> +	u64 classes;
> +
> +	if (!info->attrs[VDPA_ATTR_DEV_NAME])
> +		return -EINVAL;
> +
> +	name = nla_data(info->attrs[VDPA_ATTR_DEV_NAME]);
> +
> +	down_write(&vdpa_dev_lock);
> +	dev = bus_find_device(&vdpa_bus, NULL, name, vdpa_name_match);
> +	if (!dev) {
> +		NL_SET_ERR_MSG_MOD(info->extack, "device not found");
> +		err = -ENODEV;
> +		goto dev_err;
> +	}
> +	vdev = container_of(dev, struct vdpa_device, dev);
> +	if (!vdev->mdev) {
> +		NL_SET_ERR_MSG_MOD(
> +			info->extack,
> +			"Fail to find the specified management device");
> +		err = -EINVAL;
> +		goto mdev_err;
> +	}
> +	classes = vdpa_mgmtdev_get_classes(vdev->mdev, NULL);
> +	if (classes & BIT_ULL(VIRTIO_ID_NET)) {
> +		err = vdpa_dev_net_device_attr_set(vdev, info);
> +	} else {
> +		NL_SET_ERR_MSG_FMT_MOD(info->extack, "%s device not supported",
> +				       name);
> +	}
> +
> +mdev_err:
> +	put_device(dev);
> +dev_err:
> +	up_write(&vdpa_dev_lock);
> +	return err;
> +}
> +
>  static int vdpa_dev_config_dump(struct device *dev, void *data)
>  {
>  	struct vdpa_device *vdev = container_of(dev, struct vdpa_device, dev);
> @@ -1497,6 +1576,11 @@ static const struct genl_ops vdpa_nl_ops[] = {
>  		.doit = vdpa_nl_cmd_dev_stats_get_doit,
>  		.flags = GENL_ADMIN_PERM,
>  	},
> +	{
> +		.cmd = VDPA_CMD_DEV_ATTR_SET,
> +		.doit = vdpa_nl_cmd_dev_attr_set_doit,
> +		.flags = GENL_ADMIN_PERM,
> +	},
>  };
>  
>  static struct genl_family vdpa_nl_family __ro_after_init = {
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 7977ca03ac7a..3511156c10db 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -582,11 +582,20 @@ void vdpa_set_status(struct vdpa_device *vdev, u8 status);
>   *	     @dev: vdpa device to remove
>   *	     Driver need to remove the specified device by calling
>   *	     _vdpa_unregister_device().
> +  * @dev_set_attr: change a vdpa device's attr after it was create
> + *	     @mdev: parent device to use for device

The indentation looks a bit odd here.

    Andrew

---
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