Add support for setting the MAC address using the VDPA tool.
This feature will allow setting the MAC address using the VDPA tool.
For example, in vdpa_sim_net, the implementation sets the MAC address
to the config space. However, for other drivers, they can implement their
own function, not limited to the config space.

Changelog v2
 - Changed the function name to prevent misunderstanding
 - Added check for blk device
 - Addressed the comments
Changelog v3
 - Split the function of the net device from vdpa_nl_cmd_dev_attr_set_doit
 - Add a lock for the network device's dev_set_attr operation
 - Address the comments

Cindy Lu (2):
  vdpa: support set mac address from vdpa tool
  vdpa_sim_net: Add the support of set mac address

 drivers/vdpa/vdpa.c                  | 81 ++++++++++++++++++++++++++++
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 19 ++++++-
 include/linux/vdpa.h                 |  9 ++++
 include/uapi/linux/vdpa.h            |  1 +
 4 files changed, 109 insertions(+), 1 deletion(-)

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2.45.0