net/mlx5: Add a no-append flow insertion mode

If no-append flag is set, we will add a new FTE, instead of appending
the actions of the inserted rule when the same match already exists.

While here, move the has_flow_tag boolean indicator to be a flag too.

This patch doesn't change any functionality.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanmox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/infiniband/hw/mlx5/main.c

@@ -2793,7 +2793,7 @@ static int parse_flow_attr(struct mlx5_core_dev *mdev, u32 *match_c,
 			return -EINVAL;
 
 		action->flow_tag = ib_spec->flow_tag.tag_id;
-		action->has_flow_tag = true;
+		action->flags |= FLOW_ACT_HAS_TAG;
 		break;
 	case IB_FLOW_SPEC_ACTION_DROP:
 		if (FIELDS_NOT_SUPPORTED(ib_spec->drop,
@@ -2886,7 +2886,7 @@ is_valid_esp_aes_gcm(struct mlx5_core_dev *mdev,
 		return egress ? VALID_SPEC_INVALID : VALID_SPEC_NA;
 
 	return is_crypto && is_ipsec &&
-		(!egress || (!is_drop && !flow_act->has_flow_tag)) ?
+		(!egress || (!is_drop && !(flow_act->flags & FLOW_ACT_HAS_TAG))) ?
 		VALID_SPEC_VALID : VALID_SPEC_INVALID;
 }
 
@@ -3349,7 +3349,7 @@ static struct mlx5_ib_flow_handler *_create_flow_rule(struct mlx5_ib_dev *dev,
 					MLX5_FLOW_CONTEXT_ACTION_FWD_NEXT_PRIO;
 	}
 
-	if (flow_act.has_flow_tag &&
+	if ((flow_act.flags & FLOW_ACT_HAS_TAG)  &&
 	    (flow_attr->type == IB_FLOW_ATTR_ALL_DEFAULT ||
 	     flow_attr->type == IB_FLOW_ATTR_MC_DEFAULT)) {
 		mlx5_ib_warn(dev, "Flow tag %u and attribute type %x isn't allowed in leftovers\n",

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -684,9 +684,9 @@ mlx5e_tc_add_nic_flow(struct mlx5e_priv *priv,
 	struct mlx5_flow_destination dest[2] = {};
 	struct mlx5_flow_act flow_act = {
 		.action = attr->action,
-		.has_flow_tag = true,
 		.flow_tag = attr->flow_tag,
 		.reformat_id = 0,
+		.flags    = FLOW_ACT_HAS_TAG,
 	};
 	struct mlx5_fc *counter = NULL;
 	bool table_created = false;

drivers/net/ethernet/mellanox/mlx5/core/fpga/ipsec.c

@@ -650,7 +650,7 @@ static bool mlx5_is_fpga_egress_ipsec_rule(struct mlx5_core_dev *dev,
 	    (match_criteria_enable &
 	     ~(MLX5_MATCH_OUTER_HEADERS | MLX5_MATCH_MISC_PARAMETERS)) ||
 	    (flow_act->action & ~(MLX5_FLOW_CONTEXT_ACTION_ENCRYPT | MLX5_FLOW_CONTEXT_ACTION_ALLOW)) ||
-	     flow_act->has_flow_tag)
+	     (flow_act->flags & FLOW_ACT_HAS_TAG))
 		return false;
 
 	return true;

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -1428,7 +1428,7 @@ static int check_conflicting_ftes(struct fs_fte *fte, const struct mlx5_flow_act
 		return -EEXIST;
 	}
 
-	if (flow_act->has_flow_tag &&
+	if ((flow_act->flags & FLOW_ACT_HAS_TAG) &&
 	    fte->action.flow_tag != flow_act->flow_tag) {
 		mlx5_core_warn(get_dev(&fte->node),
 			       "FTE flow tag %u already exists with different flow tag %u\n",
@@ -1628,6 +1628,8 @@ try_add_to_existing_fg(struct mlx5_flow_table *ft,
 
 search_again_locked:
 	version = matched_fgs_get_version(match_head);
+	if (flow_act->flags & FLOW_ACT_NO_APPEND)
+		goto skip_search;
 	/* Try to find a fg that already contains a matching fte */
 	list_for_each_entry(iter, match_head, list) {
 		struct fs_fte *fte_tmp;
@@ -1644,6 +1646,11 @@ search_again_locked:
 		return rule;
 	}
 
+skip_search:
+	/* No group with matching fte found, or we skipped the search.
+	 * Try to add a new fte to any matching fg.
+	 */
+
 	/* Check the ft version, for case that new flow group
 	 * was added while the fgs weren't locked
 	 */

include/linux/mlx5/fs.h

@@ -158,20 +158,28 @@ struct mlx5_fs_vlan {
 
 #define MLX5_FS_VLAN_DEPTH	2
 
+enum {
+	FLOW_ACT_HAS_TAG   = BIT(0),
+	FLOW_ACT_NO_APPEND = BIT(1),
+};
+
 struct mlx5_flow_act {
 	u32 action;
-	bool has_flow_tag;
 	u32 flow_tag;
 	u32 reformat_id;
 	u32 modify_id;
 	uintptr_t esp_id;
+	u32 flags;
 	struct mlx5_fs_vlan vlan[MLX5_FS_VLAN_DEPTH];
 	struct ib_counters *counters;
 };
 
 #define MLX5_DECLARE_FLOW_ACT(name) \
-	struct mlx5_flow_act name = {MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,\
-				     MLX5_FS_DEFAULT_FLOW_TAG, 0, 0}
+	struct mlx5_flow_act name = { .action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST,\
+				      .flow_tag = MLX5_FS_DEFAULT_FLOW_TAG, \
+				      .reformat_id = 0, \
+				      .modify_id = 0, \
+				      .flags =  0, }
 
 /* Single destination per rule.
  * Group ID is implied by the match criteria.