RDMA/hns: add handling of CMD_EXEC_TIMEOUT

driver inclusion
category: bugfix
bugzilla: NA
CVE: NA

The application layer should be aware of cmq timeout, so we assign
last_status with CMD_EXEC_TIMEOUT in this case. In other situations,
app layer don't care about this variable.

Feature or Bugfix: Bugfix
Signed-off-by: NWeihang Li <liweihang@hisilicon.com>
Reviewed-by: Nchenglang <chenglang@huawei.com>
Reviewed-by: Nliuyixian <liuyixian@huawei.com>
Reviewed-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -1208,9 +1208,12 @@ static int __hns_roce_cmq_send(struct hns_roce_dev *hr_dev,
 			desc_ret = le16_to_cpu(desc[handle].retval);
 			if (desc_ret == CMD_EXEC_SUCCESS)
 				ret = 0;
-			else
+			else if (desc_ret == CMD_EXEC_TIMEOUT) {
+				priv->cmq.last_status = desc_ret;
+				ret = -ETIME;
+			} else
 				ret = -EIO;
-			priv->cmq.last_status = desc_ret;
+
 			ntc++;
 			handle++;
 			if (ntc == csq->desc_num)

drivers/infiniband/hw/hns/hns_roce_hw_v2.h

@@ -306,6 +306,7 @@ enum hns_roce_cmd_return_status {
 	CMD_NO_AUTH		= 1,
 	CMD_NOT_EXEC		= 2,
 	CMD_QUEUE_FULL		= 3,
+	CMD_EXEC_TIMEOUT	= 8,
 };
 
 enum hns_roce_sgid_type {