net: hns3: add wait until mac link down

mainline inclusion
from mainline-v6.5-rc6
commit 6265e242
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7WQZ1
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6265e242f7b95f2c1195b42ec912b84ad161470e



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In some configure flow of hns3 driver, for example, change mtu, it will
disable MAC through firmware before configuration. But firmware disables
MAC asynchronously. The rx traffic may be not stopped in this case.

So fixes it by waiting until mac link is down.

Fixes: a9775bb6 ("net: hns3: fix set and get link ksettings issue")
Signed-off-by: Jie Wang <wangjie125@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20230807113452.474224-4-shaojijie@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jiantao Xiao <xiaojiantao1@h-partners.com>