IB/iser: Replace fastreg descriptor valid bool with indicators container

In T10-PI support we will have memory keys for protection buffers and
signature transactions.  We prefer to compact indicators rather than
keeping multiple bools.

This commit does not change any functionality.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Alex Tabachnik <alext@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/ulp/iser/iscsi_iser.h

@@ -280,13 +280,17 @@ struct iser_device {
 							    enum iser_data_dir cmd_dir);
 };
 
+enum iser_reg_indicator {
+	ISER_DATA_KEY_VALID = 1 << 0,
+};
+
 struct fast_reg_descriptor {
 	struct list_head		  list;
 	/* For fast registration - FRWR */
 	struct ib_mr			 *data_mr;
 	struct ib_fast_reg_page_list     *data_frpl;
-	/* Valid for fast registration flag */
-	bool				  valid;
+	/* registration indicators container */
+	u8				  reg_indicators;
 };
 
 struct iser_conn {

drivers/infiniband/ulp/iser/iser_memory.c

@@ -479,7 +479,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
 		return -EINVAL;
 	}
 
-	if (!desc->valid) {
+	if (!(desc->reg_indicators & ISER_DATA_KEY_VALID)) {
 		memset(&inv_wr, 0, sizeof(inv_wr));
 		inv_wr.wr_id = ISER_FASTREG_LI_WRID;
 		inv_wr.opcode = IB_WR_LOCAL_INV;
@@ -514,7 +514,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task *iser_task,
 		iser_err("fast registration failed, ret:%d\n", ret);
 		return ret;
 	}
-	desc->valid = false;
+	desc->reg_indicators &= ~ISER_DATA_KEY_VALID;
 
 	sge->lkey = desc->data_mr->lkey;
 	sge->addr = desc->data_frpl->page_list[0] + offset;

drivers/infiniband/ulp/iser/iser_verbs.c

@@ -296,7 +296,7 @@ iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd,
 	}
 	iser_info("Create fr_desc %p page_list %p\n",
 		  desc, desc->data_frpl->page_list);
-	desc->valid = true;
+	desc->reg_indicators |= ISER_DATA_KEY_VALID;
 
 	return 0;