IB/iser: Unwind WR union at iser_tx_desc

After decreasing WRs array size from 7 to 3 it is more
readable to give each WR a descriptive name.

Signed-off-by: Israel Rukshin <[e-mail]>
Reviewed-by: Max Gurtovoy <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Sagi Grimberg <[e-mail]>
Signed-off-by: Jason Gunthorpe <[e-mail]>

drivers/infiniband/ulp/iser/iscsi_iser.c

···
 		goto out;
 	}
 
-	tx_desc->wr_idx = 0;
+	tx_desc->inv_wr.next = NULL;
+	tx_desc->reg_wr.wr.next = NULL;
 	tx_desc->mapped = true;
 	tx_desc->dma_addr = dma_addr;
 	tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;

drivers/infiniband/ulp/iser/iscsi_iser.h

···
 	ISCSI_TX_DATAOUT
 };
 
-/*
- * Maximum number of work requests per task
- * (invalidate, registration, send)
- */
-#define ISER_MAX_WRS 3
-
 /**
  * struct iser_tx_desc - iSER TX descriptor
  *
···
  *                 unsolicited data-out or control
  * @num_sge:       number sges used on this TX task
  * @mapped:        Is the task header mapped
- * @wr_idx:        Current WR index
- * @wrs:           Array of WRs per task
+ * reg_wr:         registration WR
+ * send_wr:        send WR
+ * inv_wr:         invalidate WR
  */
 struct iser_tx_desc {
 	struct iser_ctrl             iser_header;
···
 	int                          num_sge;
 	struct ib_cqe		     cqe;
 	bool			     mapped;
-	u8                           wr_idx;
-	union iser_wr {
-		struct ib_send_wr		send;
-		struct ib_reg_wr		fast_reg;
-	} wrs[ISER_MAX_WRS];
+	struct ib_reg_wr	     reg_wr;
+	struct ib_send_wr	     send_wr;
+	struct ib_send_wr	     inv_wr;
 };
 
 #define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
···
 void
 iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
 		      struct iser_fr_desc *desc);
-
-static inline struct ib_send_wr *
-iser_tx_next_wr(struct iser_tx_desc *tx_desc)
-{
-	struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx].send;
-	struct ib_send_wr *last_wr;
-
-	if (tx_desc->wr_idx) {
-		last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1].send;
-		last_wr->next = cur_wr;
-	}
-	tx_desc->wr_idx++;
-
-	return cur_wr;
-}
 
 static inline struct iser_conn *
 to_iser_conn(struct ib_conn *ib_conn)

drivers/infiniband/ulp/iser/iser_memory.c

···
 static inline void
 iser_inv_rkey(struct ib_send_wr *inv_wr,
 	      struct ib_mr *mr,
-	      struct ib_cqe *cqe)
+	      struct ib_cqe *cqe,
+	      struct ib_send_wr *next_wr)
 {
 	inv_wr->opcode = IB_WR_LOCAL_INV;
 	inv_wr->wr_cqe = cqe;
 	inv_wr->ex.invalidate_rkey = mr->rkey;
 	inv_wr->send_flags = 0;
 	inv_wr->num_sge = 0;
+	inv_wr->next = next_wr;
 }
 
 static int
···
 	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
 	struct ib_mr *mr = rsc->sig_mr;
 	struct ib_sig_attrs *sig_attrs = mr->sig_attrs;
-	struct ib_reg_wr *wr;
+	struct ib_reg_wr *wr = &tx_desc->reg_wr;
 	int ret;
 
 	memset(sig_attrs, 0, sizeof(*sig_attrs));
···
 	iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
 
 	if (rsc->mr_valid)
-		iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
+		iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
 
 	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
 
···
 		goto err;
 	}
 
-	wr = container_of(iser_tx_next_wr(tx_desc), struct ib_reg_wr, wr);
 	memset(wr, 0, sizeof(*wr));
+	wr->wr.next = &tx_desc->send_wr;
 	wr->wr.opcode = IB_WR_REG_MR_INTEGRITY;
 	wr->wr.wr_cqe = cqe;
 	wr->wr.num_sge = 0;
···
 	struct iser_tx_desc *tx_desc = &iser_task->desc;
 	struct ib_cqe *cqe = &iser_task->iser_conn->ib_conn.reg_cqe;
 	struct ib_mr *mr = rsc->mr;
-	struct ib_reg_wr *wr;
+	struct ib_reg_wr *wr = &tx_desc->reg_wr;
 	int n;
 
 	if (rsc->mr_valid)
-		iser_inv_rkey(iser_tx_next_wr(tx_desc), mr, cqe);
+		iser_inv_rkey(&tx_desc->inv_wr, mr, cqe, &wr->wr);
 
 	ib_update_fast_reg_key(mr, ib_inc_rkey(mr->rkey));
 
···
 		return n < 0 ? n : -EINVAL;
 	}
 
-	wr = container_of(iser_tx_next_wr(tx_desc), struct ib_reg_wr, wr);
+	wr->wr.next = &tx_desc->send_wr;
 	wr->wr.opcode = IB_WR_REG_MR;
 	wr->wr.wr_cqe = cqe;
 	wr->wr.send_flags = 0;

drivers/infiniband/ulp/iser/iser_verbs.c

···
 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
 		   bool signal)
 {
-	struct ib_send_wr *wr = iser_tx_next_wr(tx_desc);
+	struct ib_send_wr *wr = &tx_desc->send_wr;
+	struct ib_send_wr *first_wr;
 	int ib_ret;
 
 	ib_dma_sync_single_for_device(ib_conn->device->ib_device,
···
 	wr->opcode = IB_WR_SEND;
 	wr->send_flags = signal ? IB_SEND_SIGNALED : 0;
 
-	ib_ret = ib_post_send(ib_conn->qp, &tx_desc->wrs[0].send, NULL);
+	if (tx_desc->inv_wr.next)
+		first_wr = &tx_desc->inv_wr;
+	else if (tx_desc->reg_wr.wr.next)
+		first_wr = &tx_desc->reg_wr.wr;
+	else
+		first_wr = wr;
+
+	ib_ret = ib_post_send(ib_conn->qp, first_wr, NULL);
 	if (ib_ret)
 		iser_err("ib_post_send failed, ret:%d opcode:%d\n",
 			 ib_ret, wr->opcode);