As dmac is already resolved in kernel while creating AH, there is no need to repeat the resolving in userspace. Prioritizes getting dmac from kernel driver, unless kernel driver didn't response one. Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com> Signed-off-by: Ran Zhou <zhouran10@h-partners.com> (cherry picked from commit e6ea204613586ab8d53dadee2b83eccadde447ec)
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