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, 57 insertions, 92 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 2cdbf29ecbe7..74f7ff292052 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -102,23 +102,22 @@ nfp_flower_xmit_flow(struct nfp_app *app, struct nfp_fl_payload *nfp_flow,
 
 static bool nfp_flower_check_higher_than_mac(struct tc_cls_flower_offload *f)
 {
-	return dissector_uses_key(f->dissector,
-				  FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
-		dissector_uses_key(f->dissector,
-				   FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
-		dissector_uses_key(f->dissector,
-				   FLOW_DISSECTOR_KEY_PORTS) ||
-		dissector_uses_key(f->dissector, FLOW_DISSECTOR_KEY_ICMP);
+	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(f);
+
+	return flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV4_ADDRS) ||
+	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_IPV6_ADDRS) ||
+	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS) ||
+	       flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ICMP);
 }
 
 static int
-nfp_flower_calc_opt_layer(struct flow_dissector_key_enc_opts *enc_opts,
+nfp_flower_calc_opt_layer(struct flow_match_enc_opts *enc_opts,
 			  u32 *key_layer_two, int *key_size)
 {
-	if (enc_opts->len > NFP_FL_MAX_GENEVE_OPT_KEY)
+	if (enc_opts->key->len > NFP_FL_MAX_GENEVE_OPT_KEY)
 		return -EOPNOTSUPP;
 
-	if (enc_opts->len > 0) {
+	if (enc_opts->key->len > 0) {
 		*key_layer_two |= NFP_FLOWER_LAYER2_GENEVE_OP;
 		*key_size += sizeof(struct nfp_flower_geneve_options);
 	}
@@ -133,20 +132,21 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 				struct tc_cls_flower_offload *flow,
 				enum nfp_flower_tun_type *tun_type)
 {
-	struct flow_dissector_key_basic *mask_basic = NULL;
-	struct flow_dissector_key_basic *key_basic = NULL;
+	struct flow_rule *rule = tc_cls_flower_offload_flow_rule(flow);
+	struct flow_dissector *dissector = rule->match.dissector;
+	struct flow_match_basic basic = { NULL, NULL};
 	struct nfp_flower_priv *priv = app->priv;
 	u32 key_layer_two;
 	u8 key_layer;
 	int key_size;
 	int err;
 
-	if (flow->dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
+	if (dissector->used_keys & ~NFP_FLOWER_WHITELIST_DISSECTOR)
 		return -EOPNOTSUPP;
 
 	/* If any tun dissector is used then the required set must be used. */
-	if (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
-	    (flow->dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
+	if (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR &&
+	    (dissector->used_keys & NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 	    != NFP_FLOWER_WHITELIST_TUN_DISSECTOR_R)
 		return -EOPNOTSUPP;
 
@@ -155,76 +155,53 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 	key_size = sizeof(struct nfp_flower_meta_tci) +
 		   sizeof(struct nfp_flower_in_port);
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
-	    dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_MPLS)) {
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS) ||
+	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_MPLS)) {
 		key_layer |= NFP_FLOWER_LAYER_MAC;
 		key_size += sizeof(struct nfp_flower_mac_mpls);
 	}
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_VLAN)) {
-		struct flow_dissector_key_vlan *flow_vlan;
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
+		struct flow_match_vlan vlan;
 
-		flow_vlan = skb_flow_dissector_target(flow->dissector,
-						      FLOW_DISSECTOR_KEY_VLAN,
-						      flow->mask);
+		flow_rule_match_vlan(rule, &vlan);
 		if (!(priv->flower_ext_feats & NFP_FL_FEATS_VLAN_PCP) &&
-		    flow_vlan->vlan_priority)
+		    vlan.key->vlan_priority)
 			return -EOPNOTSUPP;
 	}
 
-	if (dissector_uses_key(flow->dissector,
-			       FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
-		struct flow_dissector_key_ipv4_addrs *mask_ipv4 = NULL;
-		struct flow_dissector_key_ports *mask_enc_ports = NULL;
-		struct flow_dissector_key_enc_opts *enc_op = NULL;
-		struct flow_dissector_key_ports *enc_ports = NULL;
-		struct flow_dissector_key_control *mask_enc_ctl =
-			skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_ENC_CONTROL,
-						  flow->mask);
-		struct flow_dissector_key_control *enc_ctl =
-			skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_ENC_CONTROL,
-						  flow->key);
-
-		if (mask_enc_ctl->addr_type != 0xffff ||
-		    enc_ctl->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_CONTROL)) {
+		struct flow_match_enc_opts enc_op = { NULL, NULL };
+		struct flow_match_ipv4_addrs ipv4_addrs;
+		struct flow_match_control enc_ctl;
+		struct flow_match_ports enc_ports;
+
+		flow_rule_match_enc_control(rule, &enc_ctl);
+
+		if (enc_ctl.mask->addr_type != 0xffff ||
+		    enc_ctl.key->addr_type != FLOW_DISSECTOR_KEY_IPV4_ADDRS)
 			return -EOPNOTSUPP;
 
 		/* These fields are already verified as used. */
-		mask_ipv4 =
-			skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
-						  flow->mask);
-		if (mask_ipv4->dst != cpu_to_be32(~0))
+		flow_rule_match_enc_ipv4_addrs(rule, &ipv4_addrs);
+		if (ipv4_addrs.mask->dst != cpu_to_be32(~0))
 			return -EOPNOTSUPP;
 
-		mask_enc_ports =
-			skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_ENC_PORTS,
-						  flow->mask);
-		enc_ports =
-			skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_ENC_PORTS,
-						  flow->key);
 
-		if (mask_enc_ports->dst != cpu_to_be16(~0))
+		flow_rule_match_enc_ports(rule, &enc_ports);
+		if (enc_ports.mask->dst != cpu_to_be16(~0))
 			return -EOPNOTSUPP;
 
-		if (dissector_uses_key(flow->dissector,
-				       FLOW_DISSECTOR_KEY_ENC_OPTS)) {
-			enc_op = skb_flow_dissector_target(flow->dissector,
-							   FLOW_DISSECTOR_KEY_ENC_OPTS,
-							   flow->key);
-		}
+		if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_OPTS))
+			flow_rule_match_enc_opts(rule, &enc_op);
 
-		switch (enc_ports->dst) {
+		switch (enc_ports.key->dst) {
 		case htons(NFP_FL_VXLAN_PORT):
 			*tun_type = NFP_FL_TUNNEL_VXLAN;
 			key_layer |= NFP_FLOWER_LAYER_VXLAN;
 			key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 
-			if (enc_op)
+			if (enc_op.key)
 				return -EOPNOTSUPP;
 			break;
 		case htons(NFP_FL_GENEVE_PORT):
@@ -236,11 +213,11 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 			key_layer_two |= NFP_FLOWER_LAYER2_GENEVE;
 			key_size += sizeof(struct nfp_flower_ipv4_udp_tun);
 
-			if (!enc_op)
+			if (!enc_op.key)
 				break;
 			if (!(priv->flower_ext_feats & NFP_FL_FEATS_GENEVE_OPT))
 				return -EOPNOTSUPP;
-			err = nfp_flower_calc_opt_layer(enc_op, &key_layer_two,
+			err = nfp_flower_calc_opt_layer(&enc_op, &key_layer_two,
 							&key_size);
 			if (err)
 				return err;
@@ -254,19 +231,12 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 			return -EOPNOTSUPP;
 	}
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
-		mask_basic = skb_flow_dissector_target(flow->dissector,
-						       FLOW_DISSECTOR_KEY_BASIC,
-						       flow->mask);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC))
+		flow_rule_match_basic(rule, &basic);
 
-		key_basic = skb_flow_dissector_target(flow->dissector,
-						      FLOW_DISSECTOR_KEY_BASIC,
-						      flow->key);
-	}
-
-	if (mask_basic && mask_basic->n_proto) {
+	if (basic.mask && basic.mask->n_proto) {
 		/* Ethernet type is present in the key. */
-		switch (key_basic->n_proto) {
+		switch (basic.key->n_proto) {
 		case cpu_to_be16(ETH_P_IP):
 			key_layer |= NFP_FLOWER_LAYER_IPV4;
 			key_size += sizeof(struct nfp_flower_ipv4);
@@ -305,9 +275,9 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 		}
 	}
 
-	if (mask_basic && mask_basic->ip_proto) {
+	if (basic.mask && basic.mask->ip_proto) {
 		/* Ethernet type is present in the key. */
-		switch (key_basic->ip_proto) {
+		switch (basic.key->ip_proto) {
 		case IPPROTO_TCP:
 		case IPPROTO_UDP:
 		case IPPROTO_SCTP:
@@ -324,14 +294,12 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 		}
 	}
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_TCP)) {
-		struct flow_dissector_key_tcp *tcp;
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_TCP)) {
+		struct flow_match_tcp tcp;
 		u32 tcp_flags;
 
-		tcp = skb_flow_dissector_target(flow->dissector,
-						FLOW_DISSECTOR_KEY_TCP,
-						flow->key);
-		tcp_flags = be16_to_cpu(tcp->flags);
+		flow_rule_match_tcp(rule, &tcp);
+		tcp_flags = be16_to_cpu(tcp.key->flags);
 
 		if (tcp_flags & ~NFP_FLOWER_SUPPORTED_TCPFLAGS)
 			return -EOPNOTSUPP;
@@ -347,12 +315,12 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 		 * space, thus we need to ensure we include a IPv4/IPv6 key
 		 * layer if we have not done so already.
 		 */
-		if (!key_basic)
+		if (!basic.key)
 			return -EOPNOTSUPP;
 
 		if (!(key_layer & NFP_FLOWER_LAYER_IPV4) &&
 		    !(key_layer & NFP_FLOWER_LAYER_IPV6)) {
-			switch (key_basic->n_proto) {
+			switch (basic.key->n_proto) {
 			case cpu_to_be16(ETH_P_IP):
 				key_layer |= NFP_FLOWER_LAYER_IPV4;
 				key_size += sizeof(struct nfp_flower_ipv4);
@@ -369,14 +337,11 @@ nfp_flower_calculate_key_layers(struct nfp_app *app,
 		}
 	}
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_CONTROL)) {
-		struct flow_dissector_key_control *key_ctl;
-
-		key_ctl = skb_flow_dissector_target(flow->dissector,
-						    FLOW_DISSECTOR_KEY_CONTROL,
-						    flow->key);
+	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
+		struct flow_match_control ctl;
 
-		if (key_ctl->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
+		flow_rule_match_control(rule, &ctl);
+		if (ctl.key->flags & ~NFP_FLOWER_SUPPORTED_CTLFLAGS)
 			return -EOPNOTSUPP;
 	}