RDMA: Constify the argument of the work request conversion functions

When posting a send work request, the work request that is posted is not
modified by any of the RDMA drivers. Make this explicit by constifying
most ib_send_wr pointers in RDMA transport drivers.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hns/hns_roce_device.h

@@ -985,7 +985,7 @@ void hns_roce_qp_remove(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp);
 void hns_roce_qp_free(struct hns_roce_dev *hr_dev, struct hns_roce_qp *hr_qp);
 void hns_roce_release_range_qp(struct hns_roce_dev *hr_dev, int base_qpn,
 			       int cnt);
-__be32 send_ieth(struct ib_send_wr *wr);
+__be32 send_ieth(const struct ib_send_wr *wr);
 int to_hr_qp_type(int qp_type);
 
 struct ib_cq *hns_roce_ib_create_cq(struct ib_device *ib_dev,

drivers/infiniband/hw/hns/hns_roce_hw_v2.c

@@ -53,7 +53,7 @@ static void set_data_seg_v2(struct hns_roce_v2_wqe_data_seg *dseg,
 	dseg->len  = cpu_to_le32(sg->length);
 }
 
-static void set_extend_sge(struct hns_roce_qp *qp, struct ib_send_wr *wr,
+static void set_extend_sge(struct hns_roce_qp *qp, const struct ib_send_wr *wr,
 			   unsigned int *sge_ind)
 {
 	struct hns_roce_v2_wqe_data_seg *dseg;
@@ -100,7 +100,7 @@ static void set_extend_sge(struct hns_roce_qp *qp, struct ib_send_wr *wr,
 	}
 }
 
-static int set_rwqe_data_seg(struct ib_qp *ibqp, struct ib_send_wr *wr,
+static int set_rwqe_data_seg(struct ib_qp *ibqp, const struct ib_send_wr *wr,
 			     struct hns_roce_v2_rc_send_wqe *rc_sq_wqe,
 			     void *wqe, unsigned int *sge_ind,
 			     struct ib_send_wr **bad_wr)