RDMA/hns: Update posting & querying mailbox
This patch updates the implementation of the mailbox command interface by using command queue instead of operating registers. With this update, the software can be well decoupled with the hardware. Signed-off-by: Lijun Ou <oulijun@huawei.com> Signed-off-by: Yixian Liu <liuyixian@huawei.com> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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