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, 74 insertions, 100 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
index c683b5e96b1d..90a2170c5138 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_tc.c
@@ -177,18 +177,12 @@ static int bnxt_tc_parse_actions(struct bnxt *bp,
 	return 0;
 }
 
-#define GET_KEY(flow_cmd, key_type)					\
-		skb_flow_dissector_target((flow_cmd)->dissector, key_type,\
-					  (flow_cmd)->key)
-#define GET_MASK(flow_cmd, key_type)					\
-		skb_flow_dissector_target((flow_cmd)->dissector, key_type,\
-					  (flow_cmd)->mask)
-
 static int bnxt_tc_parse_flow(struct bnxt *bp,
 			      struct tc_cls_flower_offload *tc_flow_cmd,
 			      struct bnxt_tc_flow *flow)
 {
-	struct flow_dissector *dissector = tc_flow_cmd->dissector;
+	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(tc_flow_cmd);
+	struct flow_dissector *dissector = rule->match.dissector;
 
 	/* KEY_CONTROL and KEY_BASIC are needed for forming a meaningful key */
 	if ((dissector->used_keys & BIT(FLOW_DISSECTOR_KEY_CONTROL)) == 0 ||
@@ -198,140 +192,120 @@ static int bnxt_tc_parse_flow(struct bnxt *bp,
 		return -EOPNOTSUPP;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_BASIC)) {
-		struct flow_dissector_key_basic *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_BASIC);
-		struct flow_dissector_key_basic *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_BASIC);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
+		struct flow_match_basic match;
 
-		flow->l2_key.ether_type = key->n_proto;
-		flow->l2_mask.ether_type = mask->n_proto;
+		flow_rule_match_basic(rule, &match);
+		flow->l2_key.ether_type = match.key->n_proto;
+		flow->l2_mask.ether_type = match.mask->n_proto;
 
-		if (key->n_proto == htons(ETH_P_IP) ||
-		    key->n_proto == htons(ETH_P_IPV6)) {
-			flow->l4_key.ip_proto = key->ip_proto;
-			flow->l4_mask.ip_proto = mask->ip_proto;
+		if (match.key->n_proto == htons(ETH_P_IP) ||
+		    match.key->n_proto == htons(ETH_P_IPV6)) {
+			flow->l4_key.ip_proto = match.key->ip_proto;
+			flow->l4_mask.ip_proto = match.mask->ip_proto;
 		}
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
-		struct flow_dissector_key_eth_addrs *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ETH_ADDRS);
-		struct flow_dissector_key_eth_addrs *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ETH_ADDRS);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
+		struct flow_match_eth_addrs match;
 
+		flow_rule_match_eth_addrs(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_ETH_ADDRS;
-		ether_addr_copy(flow->l2_key.dmac, key->dst);
-		ether_addr_copy(flow->l2_mask.dmac, mask->dst);
-		ether_addr_copy(flow->l2_key.smac, key->src);
-		ether_addr_copy(flow->l2_mask.smac, mask->src);
+		ether_addr_copy(flow->l2_key.dmac, match.key->dst);
+		ether_addr_copy(flow->l2_mask.dmac, match.mask->dst);
+		ether_addr_copy(flow->l2_key.smac, match.key->src);
+		ether_addr_copy(flow->l2_mask.smac, match.mask->src);
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_VLAN)) {
-		struct flow_dissector_key_vlan *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_VLAN);
-		struct flow_dissector_key_vlan *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_VLAN);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
+		struct flow_match_vlan match;
 
+		flow_rule_match_vlan(rule, &match);
 		flow->l2_key.inner_vlan_tci =
-		   cpu_to_be16(VLAN_TCI(key->vlan_id, key->vlan_priority));
+			cpu_to_be16(VLAN_TCI(match.key->vlan_id,
+					     match.key->vlan_priority));
 		flow->l2_mask.inner_vlan_tci =
-		   cpu_to_be16((VLAN_TCI(mask->vlan_id, mask->vlan_priority)));
+			cpu_to_be16((VLAN_TCI(match.mask->vlan_id,
+					      match.mask->vlan_priority)));
 		flow->l2_key.inner_vlan_tpid = htons(ETH_P_8021Q);
 		flow->l2_mask.inner_vlan_tpid = htons(0xffff);
 		flow->l2_key.num_vlans = 1;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
-		struct flow_dissector_key_ipv4_addrs *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
-		struct flow_dissector_key_ipv4_addrs *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
+		struct flow_match_ipv4_addrs match;
 
+		flow_rule_match_ipv4_addrs(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_IPV4_ADDRS;
-		flow->l3_key.ipv4.daddr.s_addr = key->dst;
-		flow->l3_mask.ipv4.daddr.s_addr = mask->dst;
-		flow->l3_key.ipv4.saddr.s_addr = key->src;
-		flow->l3_mask.ipv4.saddr.s_addr = mask->src;
-	} else if (dissector_uses_key(dissector,
-				      FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
-		struct flow_dissector_key_ipv6_addrs *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
-		struct flow_dissector_key_ipv6_addrs *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
-
+		flow->l3_key.ipv4.daddr.s_addr = match.key->dst;
+		flow->l3_mask.ipv4.daddr.s_addr = match.mask->dst;
+		flow->l3_key.ipv4.saddr.s_addr = match.key->src;
+		flow->l3_mask.ipv4.saddr.s_addr = match.mask->src;
+	} else if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS)) {
+		struct flow_match_ipv6_addrs match;
+
+		flow_rule_match_ipv6_addrs(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_IPV6_ADDRS;
-		flow->l3_key.ipv6.daddr = key->dst;
-		flow->l3_mask.ipv6.daddr = mask->dst;
-		flow->l3_key.ipv6.saddr = key->src;
-		flow->l3_mask.ipv6.saddr = mask->src;
+		flow->l3_key.ipv6.daddr = match.key->dst;
+		flow->l3_mask.ipv6.daddr = match.mask->dst;
+		flow->l3_key.ipv6.saddr = match.key->src;
+		flow->l3_mask.ipv6.saddr = match.mask->src;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_PORTS)) {
-		struct flow_dissector_key_ports *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_PORTS);
-		struct flow_dissector_key_ports *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_PORTS);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
+		struct flow_match_ports match;
 
+		flow_rule_match_ports(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_PORTS;
-		flow->l4_key.ports.dport = key->dst;
-		flow->l4_mask.ports.dport = mask->dst;
-		flow->l4_key.ports.sport = key->src;
-		flow->l4_mask.ports.sport = mask->src;
+		flow->l4_key.ports.dport = match.key->dst;
+		flow->l4_mask.ports.dport = match.mask->dst;
+		flow->l4_key.ports.sport = match.key->src;
+		flow->l4_mask.ports.sport = match.mask->src;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ICMP)) {
-		struct flow_dissector_key_icmp *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ICMP);
-		struct flow_dissector_key_icmp *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ICMP);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP)) {
+		struct flow_match_icmp match;
 
+		flow_rule_match_icmp(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_ICMP;
-		flow->l4_key.icmp.type = key->type;
-		flow->l4_key.icmp.code = key->code;
-		flow->l4_mask.icmp.type = mask->type;
-		flow->l4_mask.icmp.code = mask->code;
+		flow->l4_key.icmp.type = match.key->type;
+		flow->l4_key.icmp.code = match.key->code;
+		flow->l4_mask.icmp.type = match.mask->type;
+		flow->l4_mask.icmp.code = match.mask->code;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
-		struct flow_dissector_key_ipv4_addrs *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS);
-		struct flow_dissector_key_ipv4_addrs *mask =
-				GET_MASK(tc_flow_cmd,
-					 FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS)) {
+		struct flow_match_ipv4_addrs match;
 
+		flow_rule_match_enc_ipv4_addrs(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_IPV4_ADDRS;
-		flow->tun_key.u.ipv4.dst = key->dst;
-		flow->tun_mask.u.ipv4.dst = mask->dst;
-		flow->tun_key.u.ipv4.src = key->src;
-		flow->tun_mask.u.ipv4.src = mask->src;
-	} else if (dissector_uses_key(dissector,
+		flow->tun_key.u.ipv4.dst = match.key->dst;
+		flow->tun_mask.u.ipv4.dst = match.mask->dst;
+		flow->tun_key.u.ipv4.src = match.key->src;
+		flow->tun_mask.u.ipv4.src = match.mask->src;
+	} else if (flow_rule_match_key(rule,
 				      FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS)) {
 		return -EOPNOTSUPP;
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
-		struct flow_dissector_key_keyid *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ENC_KEYID);
-		struct flow_dissector_key_keyid *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ENC_KEYID);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
+		struct flow_match_enc_keyid match;
 
+		flow_rule_match_enc_keyid(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_ID;
-		flow->tun_key.tun_id = key32_to_tunnel_id(key->keyid);
-		flow->tun_mask.tun_id = key32_to_tunnel_id(mask->keyid);
+		flow->tun_key.tun_id = key32_to_tunnel_id(match.key->keyid);
+		flow->tun_mask.tun_id = key32_to_tunnel_id(match.mask->keyid);
 	}
 
-	if (dissector_uses_key(dissector, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
-		struct flow_dissector_key_ports *key =
-			GET_KEY(tc_flow_cmd, FLOW_DISSECTOR_KEY_ENC_PORTS);
-		struct flow_dissector_key_ports *mask =
-			GET_MASK(tc_flow_cmd, FLOW_DISSECTOR_KEY_ENC_PORTS);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_PORTS)) {
+		struct flow_match_ports match;
 
+		flow_rule_match_enc_ports(rule, &match);
 		flow->flags |= BNXT_TC_FLOW_FLAGS_TUNL_PORTS;
-		flow->tun_key.tp_dst = key->dst;
-		flow->tun_mask.tp_dst = mask->dst;
-		flow->tun_key.tp_src = key->src;
-		flow->tun_mask.tp_src = mask->src;
+		flow->tun_key.tp_dst = match.key->dst;
+		flow->tun_mask.tp_dst = match.mask->dst;
+		flow->tun_key.tp_src = match.key->src;
+		flow->tun_mask.tp_src = match.mask->src;
 	}
 
 	return bnxt_tc_parse_actions(bp, &flow->actions, tc_flow_cmd->exts);