[PATCH net-next 5/9] devlink: Support vdev HW address set

[Yuval Avnery]

Allow privileged user to set the HW address of a vdev.

Example:

$ devlink vdev set pci/0000:03:00.0/1 hw_addr 00:23:35:af:35:34

$ devlink vdev show pci/0000:03:00.0/1
pci/0000:03:00.0/1: flavour pcivf pf 0 vf 0 port_index 1 hw_addr 
00:23:35:af:35:34

$ devlink vdev show pci/0000:03:00.0/1 -pj
{
    "vdev": {
        "pci/0000:03:00.0/1": {
            "flavour": "pcivf",
            "pf": 0,
            "vf": 0,
            "port_index": 1,
            "hw_addr": "00:23:35:af:35:34"
        }
    }
}

Signed-off-by: Yuval Avnery <yuva...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
---
 include/net/devlink.h |  2 ++
 net/core/devlink.c    | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 12550cc92e9d..5ae329813ec8 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -765,6 +765,8 @@ struct devlink_ops {
 };
 
 struct devlink_vdev_ops {
+       int (*hw_addr_set)(struct devlink_vdev *vdev,
+                          u8 *hw_addr, struct netlink_ext_ack *extack);
        int (*hw_addr_get)(struct devlink_vdev *vdev,
                           u8 *hw_addr, struct netlink_ext_ack *extack);
        unsigned int hw_addr_len;
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 94599409f12c..15cc674b05ce 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -1063,6 +1063,23 @@ static int devlink_nl_cmd_vdev_get_dumpit(struct sk_buff 
*msg,
 static int devlink_nl_cmd_vdev_set_doit(struct sk_buff *skb,
                                        struct genl_info *info)
 {
+       struct nlattr *nla_hw_addr = info->attrs[DEVLINK_ATTR_VDEV_HW_ADDR];
+       struct devlink_vdev *devlink_vdev = info->user_ptr[0];
+       const struct devlink_vdev_ops *ops;
+       int err;
+
+       ops = devlink_vdev->ops;
+       if (nla_hw_addr) {
+               u8 *hw_addr;
+
+               if (!ops || !ops->hw_addr_set)
+                       return -EOPNOTSUPP;
+
+               hw_addr = nla_data(nla_hw_addr);
+               err = ops->hw_addr_set(devlink_vdev, hw_addr, info->extack);
+               if (err)
+                       return err;
+       }
        return 0;
 }
 
-- 
2.17.1