flow_offload: add flow_rule and flow_match structures and use them

This patch wraps the dissector key and mask - that flower uses to
represent the matching side - around the flow_match structure.

To avoid a follow up patch that would edit the same LoCs in the drivers,
this patch also wraps this new flow match structure around the flow rule
object. This new structure will also contain the flow actions in follow
up patches.

This introduces two new interfaces:

	bool flow_rule_match_key(rule, dissector_id)

that returns true if a given matching key is set on, and:

	flow_rule_match_XYZ(rule, &match);

To fetch the matching side XYZ into the match container structure, to
retrieve the key and the mask with one single call.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 88 insertions, 114 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
index ff072358d950..a20379e29e02 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -113,59 +113,49 @@ static int mlxsw_sp_flower_parse_actions(struct mlxsw_sp *mlxsw_sp,
 static void mlxsw_sp_flower_parse_ipv4(struct mlxsw_sp_acl_rule_info *rulei,
 				       struct tc_cls_flower_offload *f)
 {
-	struct flow_dissector_key_ipv4_addrs *key =
-		skb_flow_dissector_target(f->dissector,
-					  FLOW_DISSECTOR_KEY_IPV4_ADDRS,
-					  f->key);
-	struct flow_dissector_key_ipv4_addrs *mask =
-		skb_flow_dissector_target(f->dissector,
-					  FLOW_DISSECTOR_KEY_IPV4_ADDRS,
-					  f->mask);
+	struct flow_match_ipv4_addrs match;
+
+	flow_rule_match_ipv4_addrs(f->rule, &match);
 
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_0_31,
-				       (char *) &key->src,
-				       (char *) &mask->src, 4);
+				       (char *) &match.key->src,
+				       (char *) &match.mask->src, 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_0_31,
-				       (char *) &key->dst,
-				       (char *) &mask->dst, 4);
+				       (char *) &match.key->dst,
+				       (char *) &match.mask->dst, 4);
 }
 
 static void mlxsw_sp_flower_parse_ipv6(struct mlxsw_sp_acl_rule_info *rulei,
 				       struct tc_cls_flower_offload *f)
 {
-	struct flow_dissector_key_ipv6_addrs *key =
-		skb_flow_dissector_target(f->dissector,
-					  FLOW_DISSECTOR_KEY_IPV6_ADDRS,
-					  f->key);
-	struct flow_dissector_key_ipv6_addrs *mask =
-		skb_flow_dissector_target(f->dissector,
-					  FLOW_DISSECTOR_KEY_IPV6_ADDRS,
-					  f->mask);
+	struct flow_match_ipv6_addrs match;
+
+	flow_rule_match_ipv6_addrs(f->rule, &match);
 
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_96_127,
-				       &key->src.s6_addr[0x0],
-				       &mask->src.s6_addr[0x0], 4);
+				       &match.key->src.s6_addr[0x0],
+				       &match.mask->src.s6_addr[0x0], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_64_95,
-				       &key->src.s6_addr[0x4],
-				       &mask->src.s6_addr[0x4], 4);
+				       &match.key->src.s6_addr[0x4],
+				       &match.mask->src.s6_addr[0x4], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_32_63,
-				       &key->src.s6_addr[0x8],
-				       &mask->src.s6_addr[0x8], 4);
+				       &match.key->src.s6_addr[0x8],
+				       &match.mask->src.s6_addr[0x8], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_SRC_IP_0_31,
-				       &key->src.s6_addr[0xC],
-				       &mask->src.s6_addr[0xC], 4);
+				       &match.key->src.s6_addr[0xC],
+				       &match.mask->src.s6_addr[0xC], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_96_127,
-				       &key->dst.s6_addr[0x0],
-				       &mask->dst.s6_addr[0x0], 4);
+				       &match.key->dst.s6_addr[0x0],
+				       &match.mask->dst.s6_addr[0x0], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_64_95,
-				       &key->dst.s6_addr[0x4],
-				       &mask->dst.s6_addr[0x4], 4);
+				       &match.key->dst.s6_addr[0x4],
+				       &match.mask->dst.s6_addr[0x4], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_32_63,
-				       &key->dst.s6_addr[0x8],
-				       &mask->dst.s6_addr[0x8], 4);
+				       &match.key->dst.s6_addr[0x8],
+				       &match.mask->dst.s6_addr[0x8], 4);
 	mlxsw_sp_acl_rulei_keymask_buf(rulei, MLXSW_AFK_ELEMENT_DST_IP_0_31,
-				       &key->dst.s6_addr[0xC],
-				       &mask->dst.s6_addr[0xC], 4);
+				       &match.key->dst.s6_addr[0xC],
+				       &match.mask->dst.s6_addr[0xC], 4);
 }
 
 static int mlxsw_sp_flower_parse_ports(struct mlxsw_sp *mlxsw_sp,
@@ -173,9 +163,10 @@ static int mlxsw_sp_flower_parse_ports(struct mlxsw_sp *mlxsw_sp,
 				       struct tc_cls_flower_offload *f,
 				       u8 ip_proto)
 {
-	struct flow_dissector_key_ports *key, *mask;
+	const struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
+	struct flow_match_ports match;
 
-	if (!dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_PORTS))
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS))
 		return 0;
 
 	if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP) {
@@ -184,16 +175,13 @@ static int mlxsw_sp_flower_parse_ports(struct mlxsw_sp *mlxsw_sp,
 		return -EINVAL;
 	}
 
-	key = skb_flow_dissector_target(f->dissector,
-					FLOW_DISSECTOR_KEY_PORTS,
-					f->key);
-	mask = skb_flow_dissector_target(f->dissector,
-					 FLOW_DISSECTOR_KEY_PORTS,
-					 f->mask);
+	flow_rule_match_ports(rule, &match);
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_DST_L4_PORT,
-				       ntohs(key->dst), ntohs(mask->dst));
+				       ntohs(match.key->dst),
+				       ntohs(match.mask->dst));
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_SRC_L4_PORT,
-				       ntohs(key->src), ntohs(mask->src));
+				       ntohs(match.key->src),
+				       ntohs(match.mask->src));
 	return 0;
 }
 
@@ -202,9 +190,10 @@ static int mlxsw_sp_flower_parse_tcp(struct mlxsw_sp *mlxsw_sp,
 				     struct tc_cls_flower_offload *f,
 				     u8 ip_proto)
 {
-	struct flow_dissector_key_tcp *key, *mask;
+	const struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
+	struct flow_match_tcp match;
 
-	if (!dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_TCP))
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP))
 		return 0;
 
 	if (ip_proto != IPPROTO_TCP) {
@@ -213,14 +202,11 @@ static int mlxsw_sp_flower_parse_tcp(struct mlxsw_sp *mlxsw_sp,
 		return -EINVAL;
 	}
 
-	key = skb_flow_dissector_target(f->dissector,
-					FLOW_DISSECTOR_KEY_TCP,
-					f->key);
-	mask = skb_flow_dissector_target(f->dissector,
-					 FLOW_DISSECTOR_KEY_TCP,
-					 f->mask);
+	flow_rule_match_tcp(rule, &match);
+
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_TCP_FLAGS,
-				       ntohs(key->flags), ntohs(mask->flags));
+				       ntohs(match.key->flags),
+				       ntohs(match.mask->flags));
 	return 0;
 }
 
@@ -229,9 +215,10 @@ static int mlxsw_sp_flower_parse_ip(struct mlxsw_sp *mlxsw_sp,
 				    struct tc_cls_flower_offload *f,
 				    u16 n_proto)
 {
-	struct flow_dissector_key_ip *key, *mask;
+	const struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
+	struct flow_match_ip match;
 
-	if (!dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_IP))
+	if (!flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IP))
 		return 0;
 
 	if (n_proto != ETH_P_IP && n_proto != ETH_P_IPV6) {
@@ -240,20 +227,18 @@ static int mlxsw_sp_flower_parse_ip(struct mlxsw_sp *mlxsw_sp,
 		return -EINVAL;
 	}
 
-	key = skb_flow_dissector_target(f->dissector,
-					FLOW_DISSECTOR_KEY_IP,
-					f->key);
-	mask = skb_flow_dissector_target(f->dissector,
-					 FLOW_DISSECTOR_KEY_IP,
-					 f->mask);
+	flow_rule_match_ip(rule, &match);
+
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_IP_TTL_,
-				       key->ttl, mask->ttl);
+				       match.key->ttl, match.mask->ttl);
 
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_IP_ECN,
-				       key->tos & 0x3, mask->tos & 0x3);
+				       match.key->tos & 0x3,
+				       match.mask->tos & 0x3);
 
 	mlxsw_sp_acl_rulei_keymask_u32(rulei, MLXSW_AFK_ELEMENT_IP_DSCP,
-				       key->tos >> 6, mask->tos >> 6);
+				       match.key->tos >> 6,
+				       match.mask->tos >> 6);
 
 	return 0;
 }
@@ -263,13 +248,15 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 				 struct mlxsw_sp_acl_rule_info *rulei,
 				 struct tc_cls_flower_offload *f)
 {
+	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
+	struct flow_dissector *dissector = rule->match.dissector;
 	u16 n_proto_mask = 0;
 	u16 n_proto_key = 0;
 	u16 addr_type = 0;
 	u8 ip_proto = 0;
 	int err;
 
-	if (f->dissector->used_keys &
+	if (dissector->used_keys &
 	    ~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
 	      BIT(FLOW_DISSECTOR_KEY_BASIC) |
 	      BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
@@ -286,25 +273,19 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 
 	mlxsw_sp_acl_rulei_priority(rulei, f->common.prio);
 
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
-		struct flow_dissector_key_control *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_CONTROL,
-						  f->key);
-		addr_type = key->addr_type;
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
+		struct flow_match_control match;
+
+		flow_rule_match_control(rule, &match);
+		addr_type = match.key->addr_type;
 	}
 
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
-		struct flow_dissector_key_basic *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_BASIC,
-						  f->key);
-		struct flow_dissector_key_basic *mask =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_BASIC,
-						  f->mask);
-		n_proto_key = ntohs(key->n_proto);
-		n_proto_mask = ntohs(mask->n_proto);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
+		struct flow_match_basic match;
+
+		flow_rule_match_basic(rule, &match);
+		n_proto_key = ntohs(match.key->n_proto);
+		n_proto_mask = ntohs(match.mask->n_proto);
 
 		if (n_proto_key == ETH_P_ALL) {
 			n_proto_key = 0;
@@ -314,60 +295,53 @@ static int mlxsw_sp_flower_parse(struct mlxsw_sp *mlxsw_sp,
 					       MLXSW_AFK_ELEMENT_ETHERTYPE,
 					       n_proto_key, n_proto_mask);
 
-		ip_proto = key->ip_proto;
+		ip_proto = match.key->ip_proto;
 		mlxsw_sp_acl_rulei_keymask_u32(rulei,
 					       MLXSW_AFK_ELEMENT_IP_PROTO,
-					       key->ip_proto, mask->ip_proto);
+					       match.key->ip_proto,
+					       match.mask->ip_proto);
 	}
 
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
-		struct flow_dissector_key_eth_addrs *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_ETH_ADDRS,
-						  f->key);
-		struct flow_dissector_key_eth_addrs *mask =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_ETH_ADDRS,
-						  f->mask);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
+		struct flow_match_eth_addrs match;
 
+		flow_rule_match_eth_addrs(rule, &match);
 		mlxsw_sp_acl_rulei_keymask_buf(rulei,
 					       MLXSW_AFK_ELEMENT_DMAC_32_47,
-					       key->dst, mask->dst, 2);
+					       match.key->dst,
+					       match.mask->dst, 2);
 		mlxsw_sp_acl_rulei_keymask_buf(rulei,
 					       MLXSW_AFK_ELEMENT_DMAC_0_31,
-					       key->dst + 2, mask->dst + 2, 4);
+					       match.key->dst + 2,
+					       match.mask->dst + 2, 4);
 		mlxsw_sp_acl_rulei_keymask_buf(rulei,
 					       MLXSW_AFK_ELEMENT_SMAC_32_47,
-					       key->src, mask->src, 2);
+					       match.key->src,
+					       match.mask->src, 2);
 		mlxsw_sp_acl_rulei_keymask_buf(rulei,
 					       MLXSW_AFK_ELEMENT_SMAC_0_31,
-					       key->src + 2, mask->src + 2, 4);
+					       match.key->src + 2,
+					       match.mask->src + 2, 4);
 	}
 
-	if (dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_VLAN)) {
-		struct flow_dissector_key_vlan *key =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_VLAN,
-						  f->key);
-		struct flow_dissector_key_vlan *mask =
-			skb_flow_dissector_target(f->dissector,
-						  FLOW_DISSECTOR_KEY_VLAN,
-						  f->mask);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
+		struct flow_match_vlan match;
 
+		flow_rule_match_vlan(rule, &match);
 		if (mlxsw_sp_acl_block_is_egress_bound(block)) {
 			NL_SET_ERR_MSG_MOD(f->common.extack, "vlan_id key is not supported on egress");
 			return -EOPNOTSUPP;
 		}
-		if (mask->vlan_id != 0)
+		if (match.mask->vlan_id != 0)
 			mlxsw_sp_acl_rulei_keymask_u32(rulei,
 						       MLXSW_AFK_ELEMENT_VID,
-						       key->vlan_id,
-						       mask->vlan_id);
-		if (mask->vlan_priority != 0)
+						       match.key->vlan_id,
+						       match.mask->vlan_id);
+		if (match.mask->vlan_priority != 0)
 			mlxsw_sp_acl_rulei_keymask_u32(rulei,
 						       MLXSW_AFK_ELEMENT_PCP,
-						       key->vlan_priority,
-						       mask->vlan_priority);
+						       match.key->vlan_priority,
+						       match.mask->vlan_priority);
 	}
 
 	if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS)