IB/iser: Use iser_fr_desc as registration context

After removing the FMR support in iSER, there is only one type of
registration context. Replace the void pointer with the explicit structure
for registration (struct iser_fr_desc).

Link: https://lore.kernel.org/r/20220308145546.8372-3-mgurtovoy@nvidia.com
Reviewed-by: Sergey Gorenko <sergeygo@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/iser/iscsi_iser.h

@@ -203,12 +203,12 @@ struct iser_reg_resources;
  *
  * @sge:          memory region sg element
  * @rkey:         memory region remote key
- * @mem_h:        pointer to registration context (FMR/Fastreg)
+ * @desc:         pointer to fast registration context
  */
 struct iser_mem_reg {
-	struct ib_sge	 sge;
-	u32		 rkey;
-	void		*mem_h;
+	struct ib_sge sge;
+	u32 rkey;
+	struct iser_fr_desc *desc;
 };
 
 enum iser_desc_type {

drivers/infiniband/ulp/iser/iser_initiator.c

@@ -619,13 +619,13 @@ static int iser_check_remote_inv(struct iser_conn *iser_conn, struct ib_wc *wc,
 			struct iser_fr_desc *desc;
 
 			if (iser_task->dir[ISER_DIR_IN]) {
-				desc = iser_task->rdma_reg[ISER_DIR_IN].mem_h;
+				desc = iser_task->rdma_reg[ISER_DIR_IN].desc;
 				if (unlikely(iser_inv_desc(desc, rkey)))
 					return -EINVAL;
 			}
 
 			if (iser_task->dir[ISER_DIR_OUT]) {
-				desc = iser_task->rdma_reg[ISER_DIR_OUT].mem_h;
+				desc = iser_task->rdma_reg[ISER_DIR_OUT].desc;
 				if (unlikely(iser_inv_desc(desc, rkey)))
 					return -EINVAL;
 			}

drivers/infiniband/ulp/iser/iser_memory.c

@@ -129,7 +129,7 @@ void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 	struct iser_fr_desc *desc;
 	struct ib_mr_status mr_status;
 
-	desc = reg->mem_h;
+	desc = reg->desc;
 	if (!desc)
 		return;
 
@@ -146,8 +146,8 @@ void iser_unreg_mem_fastreg(struct iscsi_iser_task *iser_task,
 		ib_check_mr_status(desc->rsc.sig_mr, IB_MR_CHECK_SIG_STATUS,
 				   &mr_status);
 	}
-	iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->mem_h);
-	reg->mem_h = NULL;
+	iser_reg_desc_put_fr(&iser_task->iser_conn->ib_conn, reg->desc);
+	reg->desc = NULL;
 }
 
 static void iser_set_dif_domain(struct scsi_cmnd *sc,
@@ -357,7 +357,7 @@ int iser_reg_mem_fastreg(struct iscsi_iser_task *task,
 		desc->sig_protected = true;
 	}
 
-	reg->mem_h = desc;
+	reg->desc = desc;
 
 	return 0;
 

drivers/infiniband/ulp/iser/iser_verbs.c

@@ -904,7 +904,7 @@ u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
 			     enum iser_data_dir cmd_dir, sector_t *sector)
 {
 	struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
-	struct iser_fr_desc *desc = reg->mem_h;
+	struct iser_fr_desc *desc = reg->desc;
 	unsigned long sector_size = iser_task->sc->device->sector_size;
 	struct ib_mr_status mr_status;
 	int ret;