netdev - Re: [PATCH v7 1/3] vdpa: support set mac address from vdpa tool

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Message-ID: <52af9b4f-aa8f-4c6f-9ced-c6fa9b396343@lunn.ch>
Date: Mon, 29 Jul 2024 21:13:26 +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: [PATCH v7 1/3] vdpa: support set mac address from vdpa tool

> +static int vdpa_dev_net_device_attr_set(struct vdpa_device *vdev,
> +					struct genl_info *info)
> +{
> +	struct vdpa_dev_set_config set_config = {};
> +	struct vdpa_mgmt_dev *mdev = vdev->mdev;
> +	struct nlattr **nl_attrs = info->attrs;
> +	const u8 *macaddr;
> +	int err = -EINVAL;
> +
> +	down_write(&vdev->cf_lock);
> +	if (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)) {
> +			ether_addr_copy(set_config.net.mac, macaddr);
> +			memcpy(set_config.net.mac, macaddr, ETH_ALEN);

ether_addr_copy() and memcpy()?

> +			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 does not support changing the MAC address");

You would generally return EOPNOTSUPP in this case, not EINVAL.

Also, the device does not support setting attributes. Given the
generic name, i assume you plan to set other attributes in the future,
at which point this error message will be wrong.

	Andrew