RDMA/hns: Remove magic number

mainline inclusion
from mainline-v5.16-rc2
commit 9c3631d1
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4QOTS
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=9c3631d17054a8766dbdc1abf8d29306260e7c7f

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

Don't use unintelligible constants.

Link: https://lore.kernel.org/r/20211119140208.40416-10-liangwenpeng@huawei.comSigned-off-by: NXinhao Liu <liuxinhao5@hisilicon.com>
Signed-off-by: NWenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>
sigend-off-by: NGuofeng Yue <yueguofeng@hisilicon.com>
Reviewed-by: NYangyang Li <liyangyang20@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -678,6 +678,7 @@ static void hns_roce_write512(struct hns_roce_dev *hr_dev, u64 *val,
 static void write_dwqe(struct hns_roce_dev *hr_dev, struct hns_roce_qp *qp,
 		       void *wqe)
 {
+#define HNS_ROCE_SL_SHIFT 2
 	struct hns_roce_v2_rc_send_wqe *rc_sq_wqe = wqe;
 
 	/* All kinds of DirectWQE have the same header field layout */
@@ -685,7 +686,8 @@ static void write_dwqe(struct hns_roce_dev *hr_dev, struct hns_roce_qp *qp,
 	roce_set_field(rc_sq_wqe->byte_4, V2_RC_SEND_WQE_BYTE_4_DB_SL_L_M,
 		       V2_RC_SEND_WQE_BYTE_4_DB_SL_L_S, qp->sl);
 	roce_set_field(rc_sq_wqe->byte_4, V2_RC_SEND_WQE_BYTE_4_DB_SL_H_M,
-		       V2_RC_SEND_WQE_BYTE_4_DB_SL_H_S, qp->sl >> 2);
+		       V2_RC_SEND_WQE_BYTE_4_DB_SL_H_S,
+		       qp->sl >> HNS_ROCE_SL_SHIFT);
 	roce_set_field(rc_sq_wqe->byte_4, V2_RC_SEND_WQE_BYTE_4_WQE_INDEX_M,
 		       V2_RC_SEND_WQE_BYTE_4_WQE_INDEX_S, qp->sq.head);