net/mlx5: reduce flex item flow handle size

[ upstream commit cfe337e ]

Reduce flex item flow handle size from 32 bits to 8 bits for each
flow.
The patch will save memory in setups with millions of flows.

Fixes: a23e9b6 ("net/mlx5: handle flex item in flows")

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

drivers/net/mlx5/mlx5_flow.h

@@ -698,7 +698,6 @@ struct mlx5_flow_handle {
 	uint32_t split_flow_id:27; /**< Sub flow unique match flow id. */
 	uint32_t is_meter_flow_id:1; /**< Indicate if flow_id is for meter. */
 	uint32_t fate_action:3; /**< Fate action type. */
-	uint32_t flex_item; /**< referenced Flex Item bitmask. */
 	union {
 		uint32_t rix_hrxq; /**< Hash Rx queue object index. */
 		uint32_t rix_jump; /**< Index to the jump action resource. */
@@ -714,6 +713,7 @@ struct mlx5_flow_handle {
 #if defined(HAVE_IBV_FLOW_DV_SUPPORT) || !defined(HAVE_INFINIBAND_VERBS_H)
 	struct mlx5_flow_handle_dv dvh;
 #endif
+	uint8_t flex_item; /**< referenced Flex Item bitmask. */
 } __rte_packed;
 
 /*

drivers/net/mlx5/mlx5_flow_dv.c

@@ -10196,7 +10196,7 @@ flow_dv_translate_item_flex(struct rte_eth_dev *dev, void *matcher, void *key,
 		/* Don't count both inner and outer flex items in one rule. */
 		if (mlx5_flex_acquire_index(dev, spec->handle, true) != index)
 			MLX5_ASSERT(false);
-		dev_flow->handle->flex_item |= RTE_BIT32(index);
+		dev_flow->handle->flex_item |= (uint8_t)RTE_BIT32(index);
 	}
 	mlx5_flex_flow_translate_item(dev, matcher, key, item, is_inner);
 }
@@ -14535,7 +14535,7 @@ flow_dv_destroy(struct rte_eth_dev *dev, struct rte_flow *flow)
 			int index = rte_bsf32(dev_handle->flex_item);
 
 			mlx5_flex_release_index(dev, index);
-			dev_handle->flex_item &= ~RTE_BIT32(index);
+			dev_handle->flex_item &= ~(uint8_t)RTE_BIT32(index);
 		}
 		if (dev_handle->dvh.matcher)
 			flow_dv_matcher_release(dev, dev_handle);