RDMA/hns: Response dmac to userspace

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8HZ7W
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d3f4020a213e1cb125eed2363fca372a23f7de7a



----------------------------------------------------------------------

While creating AH, dmac is already resolved in kernel. Response dmac
to userspace so that userspace doesn't need to resolve dmac repeatedly.

Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://lore.kernel.org/r/20231207114231.2872104-3-huangjunxian6@hisilicon.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Juan Zhou <zhoujuan51@h-partners.com>