nfp: flower: refactor shared ip header in match offload

Refactored shared ip header code for IPv4 and IPv6 in match offload.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/cmsg.h

@@ -260,6 +260,13 @@ struct nfp_flower_tp_ports {
 	__be16 port_dst;
 };
 
+struct nfp_flower_ip_ext {
+	u8 tos;
+	u8 proto;
+	u8 ttl;
+	u8 flags;
+};
+
 /* L3 IPv4 details (3W/12B)
  *    3                   2                   1
  *  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
@@ -272,10 +279,7 @@ struct nfp_flower_tp_ports {
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
 struct nfp_flower_ipv4 {
-	u8 tos;
-	u8 proto;
-	u8 ttl;
-	u8 flags;
+	struct nfp_flower_ip_ext ip_ext;
 	__be32 ipv4_src;
 	__be32 ipv4_dst;
 };
@@ -284,7 +288,7 @@ struct nfp_flower_ipv4 {
  *    3                   2                   1
  *  1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- * |    DSCP   |ECN|   protocol    |          reserved             |
+ * |    DSCP   |ECN|   protocol    |      ttl      |     flags     |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  * |   ipv6_exthdr   | res |            ipv6_flow_label            |
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -306,10 +310,7 @@ struct nfp_flower_ipv4 {
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
 struct nfp_flower_ipv6 {
-	u8 tos;
-	u8 proto;
-	u8 ttl;
-	u8 reserved;
+	struct nfp_flower_ip_ext ip_ext;
 	__be32 ipv6_flow_label_exthdr;
 	struct in6_addr ipv6_src;
 	struct in6_addr ipv6_dst;

drivers/net/ethernet/netronome/nfp/flower/match.c

@@ -146,26 +146,15 @@ nfp_flower_compile_tport(struct nfp_flower_tp_ports *frame,
 }
 
 static void
-nfp_flower_compile_ipv4(struct nfp_flower_ipv4 *frame,
-			struct tc_cls_flower_offload *flow,
-			bool mask_version)
+nfp_flower_compile_ip_ext(struct nfp_flower_ip_ext *frame,
+			  struct tc_cls_flower_offload *flow,
+			  bool mask_version)
 {
 	struct fl_flow_key *target = mask_version ? flow->mask : flow->key;
-	struct flow_dissector_key_ipv4_addrs *addr;
-	struct flow_dissector_key_basic *basic;
-
-	memset(frame, 0, sizeof(struct nfp_flower_ipv4));
-
-	if (dissector_uses_key(flow->dissector,
-			       FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
-		addr = skb_flow_dissector_target(flow->dissector,
-						 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
-						 target);
-		frame->ipv4_src = addr->src;
-		frame->ipv4_dst = addr->dst;
-	}
 
 	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
+		struct flow_dissector_key_basic *basic;
+
 		basic = skb_flow_dissector_target(flow->dissector,
 						  FLOW_DISSECTOR_KEY_BASIC,
 						  target);
@@ -203,6 +192,28 @@ nfp_flower_compile_ipv4(struct nfp_flower_ipv4 *frame,
 	}
 }
 
+static void
+nfp_flower_compile_ipv4(struct nfp_flower_ipv4 *frame,
+			struct tc_cls_flower_offload *flow,
+			bool mask_version)
+{
+	struct fl_flow_key *target = mask_version ? flow->mask : flow->key;
+	struct flow_dissector_key_ipv4_addrs *addr;
+
+	memset(frame, 0, sizeof(struct nfp_flower_ipv4));
+
+	if (dissector_uses_key(flow->dissector,
+			       FLOW_DISSECTOR_KEY_IPV4_ADDRS)) {
+		addr = skb_flow_dissector_target(flow->dissector,
+						 FLOW_DISSECTOR_KEY_IPV4_ADDRS,
+						 target);
+		frame->ipv4_src = addr->src;
+		frame->ipv4_dst = addr->dst;
+	}
+
+	nfp_flower_compile_ip_ext(&frame->ip_ext, flow, mask_version);
+}
+
 static void
 nfp_flower_compile_ipv6(struct nfp_flower_ipv6 *frame,
 			struct tc_cls_flower_offload *flow,
@@ -210,7 +221,6 @@ nfp_flower_compile_ipv6(struct nfp_flower_ipv6 *frame,
 {
 	struct fl_flow_key *target = mask_version ? flow->mask : flow->key;
 	struct flow_dissector_key_ipv6_addrs *addr;
-	struct flow_dissector_key_basic *basic;
 
 	memset(frame, 0, sizeof(struct nfp_flower_ipv6));
 
@@ -223,22 +233,7 @@ nfp_flower_compile_ipv6(struct nfp_flower_ipv6 *frame,
 		frame->ipv6_dst = addr->dst;
 	}
 
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_BASIC)) {
-		basic = skb_flow_dissector_target(flow->dissector,
-						  FLOW_DISSECTOR_KEY_BASIC,
-						  target);
-		frame->proto = basic->ip_proto;
-	}
-
-	if (dissector_uses_key(flow->dissector, FLOW_DISSECTOR_KEY_IP)) {
-		struct flow_dissector_key_ip *flow_ip;
-
-		flow_ip = skb_flow_dissector_target(flow->dissector,
-						    FLOW_DISSECTOR_KEY_IP,
-						    target);
-		frame->tos = flow_ip->tos;
-		frame->ttl = flow_ip->ttl;
-	}
+	nfp_flower_compile_ip_ext(&frame->ip_ext, flow, mask_version);
 }
 
 static void