mlxsw: spectrum_flower: Split iif parsing to a separate function

Currently, mlxsw only supports the 'ingress_ifindex' field in the
'FLOW_DISSECTOR_KEY_META' key, but subsequent patches are going to add
support for the 'l2_miss' field as well. Split the parsing of the
'ingress_ifindex' field to a separate function to avoid nesting. No
functional changes intended.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c

@@ -281,45 +281,35 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 	return 0;
 }
 
-static int mlxsw_sp_flower_parse_meta(struct mlxsw_sp_acl_rule_info *rulei,
-				      struct flow_cls_offload *f,
-				      struct mlxsw_sp_flow_block *block)
+static int
+mlxsw_sp_flower_parse_meta_iif(struct mlxsw_sp_acl_rule_info *rulei,
+			       const struct mlxsw_sp_flow_block *block,
+			       const struct flow_match_meta *match,
+			       struct netlink_ext_ack *extack)
 {
-	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
 	struct mlxsw_sp_port *mlxsw_sp_port;
 	struct net_device *ingress_dev;
-	struct flow_match_meta match;
-
-	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META))
-		return 0;
-
-	flow_rule_match_meta(rule, &match);
 
-	if (match.mask->l2_miss) {
-		NL_SET_ERR_MSG_MOD(f->common.extack, "Can't match on \"l2_miss\"");
-		return -EOPNOTSUPP;
-	}
-
-	if (match.mask->ingress_ifindex != 0xFFFFFFFF) {
-		NL_SET_ERR_MSG_MOD(f->common.extack, "Unsupported ingress ifindex mask");
+	if (match->mask->ingress_ifindex != 0xFFFFFFFF) {
+		NL_SET_ERR_MSG_MOD(extack, "Unsupported ingress ifindex mask");
 		return -EINVAL;
 	}
 
 	ingress_dev = __dev_get_by_index(block->net,
-					 match.key->ingress_ifindex);
+					 match->key->ingress_ifindex);
 	if (!ingress_dev) {
-		NL_SET_ERR_MSG_MOD(f->common.extack, "Can't find specified ingress port to match on");
+		NL_SET_ERR_MSG_MOD(extack, "Can't find specified ingress port to match on");
 		return -EINVAL;
 	}
 
 	if (!mlxsw_sp_port_dev_check(ingress_dev)) {
-		NL_SET_ERR_MSG_MOD(f->common.extack, "Can't match on non-mlxsw ingress port");
+		NL_SET_ERR_MSG_MOD(extack, "Can't match on non-mlxsw ingress port");
 		return -EINVAL;
 	}
 
 	mlxsw_sp_port = netdev_priv(ingress_dev);
 	if (mlxsw_sp_port->mlxsw_sp != block->mlxsw_sp) {
-		NL_SET_ERR_MSG_MOD(f->common.extack, "Can't match on a port from different device");
+		NL_SET_ERR_MSG_MOD(extack, "Can't match on a port from different device");
 		return -EINVAL;
 	}
 
@@ -327,9 +317,31 @@ static int mlxsw_sp_flower_parse_meta(struct mlxsw_sp_acl_rule_info *rulei,
 				       MLXSW_AFK_ELEMENT_SRC_SYS_PORT,
 				       mlxsw_sp_port->local_port,
 				       0xFFFFFFFF);
+
 	return 0;
 }
 
+static int mlxsw_sp_flower_parse_meta(struct mlxsw_sp_acl_rule_info *rulei,
+				      struct flow_cls_offload *f,
+				      struct mlxsw_sp_flow_block *block)
+{
+	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
+	struct flow_match_meta match;
+
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_META))
+		return 0;
+
+	flow_rule_match_meta(rule, &match);
+
+	if (match.mask->l2_miss) {
+		NL_SET_ERR_MSG_MOD(f->common.extack, "Can't match on \"l2_miss\"");
+		return -EOPNOTSUPP;
+	}
+
+	return mlxsw_sp_flower_parse_meta_iif(rulei, block, &match,
+					      f->common.extack);
+}
+
 static void mlxsw_sp_flower_parse_ipv4(struct mlxsw_sp_acl_rule_info *rulei,
 				       struct flow_cls_offload *f)
 {