Re: [PATCH 1/2] vdpa: support set mac address from vdpa tool

From: Cindy Lu
Date: Thu Jun 13 2024 - 09:30:02 EST

On Thu, Jun 13, 2024 at 2:59 PM Michael S. Tsirkin <mst@xxxxxxxxxx> wrote:
>
> On Tue, Jun 11, 2024 at 01:32:32PM +0800, Cindy Lu wrote:
> > Add new UAPI to support the mac address from vdpa tool
> > Function vdpa_nl_cmd_dev_config_set_doit() will get the
> > 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 sample:
> > 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@xxxxxxxxxx>
>
>
>
> I think actually the idea of allowing provisioning
> by specifying config of the device is actually valid.
> However
> - the name SET_CONFIG makes people think this allows
> writing even when e.g. device is assigned to guest
> - having the internal api be mac specific is weird
>
> Shouldn't config be an attribute maybe, not a new command?
>
Got it. Thanks, Michael. I will change this.
Thanks
Cindy
>
> > ---
> > drivers/vdpa/vdpa.c | 71 +++++++++++++++++++++++++++++++++++++++
> > include/linux/vdpa.h | 2 ++
> > include/uapi/linux/vdpa.h | 1 +
> > 3 files changed, 74 insertions(+)
> >
> > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > index a7612e0783b3..347ae6e7749d 100644
> > --- a/drivers/vdpa/vdpa.c
> > +++ b/drivers/vdpa/vdpa.c
> > @@ -1149,6 +1149,72 @@ static int vdpa_nl_cmd_dev_config_get_doit(struct sk_buff *skb, struct genl_info
> > return err;
> > }
> >
> > +static int vdpa_nl_cmd_dev_config_set_doit(struct sk_buff *skb,
> > + struct genl_info *info)
> > +{
> > + struct vdpa_dev_set_config set_config = {};
> > + struct nlattr **nl_attrs = info->attrs;
> > + struct vdpa_mgmt_dev *mdev;
> > + const u8 *macaddr;
> > + const char *name;
> > + int err = 0;
> > + struct device *dev;
> > + struct vdpa_device *vdev;
> > +
> > + 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;
> > + }
> > + mdev = vdev->mdev;
> > + if (nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]) {
> > + if (!(mdev->supported_features & BIT_ULL(VIRTIO_NET_F_MAC))) {
> > + NL_SET_ERR_MSG_FMT_MOD(
> > + info->extack,
> > + "Missing features 0x%llx for provided attributes",
> > + BIT_ULL(VIRTIO_NET_F_MAC));
> > + err = -EINVAL;
> > + goto mdev_err;
> > + }
> > + macaddr = nla_data(nl_attrs[VDPA_ATTR_DEV_NET_CFG_MACADDR]);
> > + memcpy(set_config.net.mac, macaddr, ETH_ALEN);
> > + set_config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
> > + if (mdev->ops->set_mac) {
> > + err = mdev->ops->set_mac(mdev, vdev, &set_config);
> > + } else {
> > + NL_SET_ERR_MSG_FMT_MOD(
> > + info->extack,
> > + "%s device not support set mac address ", name);
> > + }
> > +
> > + } else {
> > + NL_SET_ERR_MSG_FMT_MOD(info->extack,
> > + "%s device not support this config ",
> > + 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);
> > @@ -1285,6 +1351,11 @@ static const struct genl_ops vdpa_nl_ops[] = {
> > .doit = vdpa_nl_cmd_dev_stats_get_doit,
> > .flags = GENL_ADMIN_PERM,
> > },
> > + {
> > + .cmd = VDPA_CMD_DEV_CONFIG_SET,
> > + .doit = vdpa_nl_cmd_dev_config_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 db15ac07f8a6..c97f4f1da753 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -581,6 +581,8 @@ struct vdpa_mgmtdev_ops {
> > int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name,
> > const struct vdpa_dev_set_config *config);
> > void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev);
> > + int (*set_mac)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev,
> > + const struct vdpa_dev_set_config *config);
> > };
> >
> > /**
> > diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> > index 54b649ab0f22..53f249fb26bc 100644
> > --- a/include/uapi/linux/vdpa.h
> > +++ b/include/uapi/linux/vdpa.h
> > @@ -19,6 +19,7 @@ enum vdpa_command {
> > VDPA_CMD_DEV_GET, /* can dump */
> > VDPA_CMD_DEV_CONFIG_GET, /* can dump */
> > VDPA_CMD_DEV_VSTATS_GET,
> > + VDPA_CMD_DEV_CONFIG_SET,
> > };
> >
> > enum vdpa_attr {
> > --
> > 2.45.0
>