openvswitch: Pack struct sw_flow_key.

struct sw_flow_key has two 16-bit holes. Move the most matched
conntrack match fields there.  In some typical cases this reduces the
size of the key that needs to be hashed into half and into one cache
line.

Signed-off-by: Jarno Rajahalme <jarno@ovn.org>
Acked-by: Joe Stringer <joe@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/openvswitch/conntrack.c

@@ -152,7 +152,7 @@ static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
 					const struct nf_conntrack_tuple *orig,
 					u8 icmp_proto)
 {
-	key->ct.orig_proto = orig->dst.protonum;
+	key->ct_orig_proto = orig->dst.protonum;
 	if (orig->dst.protonum == icmp_proto) {
 		key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
 		key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
@@ -166,8 +166,8 @@ static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
 				const struct nf_conntrack_zone *zone,
 				const struct nf_conn *ct)
 {
-	key->ct.state = state;
-	key->ct.zone = zone->id;
+	key->ct_state = state;
+	key->ct_zone = zone->id;
 	key->ct.mark = ovs_ct_get_mark(ct);
 	ovs_ct_get_labels(ct, &key->ct.labels);
 
@@ -195,10 +195,10 @@ static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
 			return;
 		}
 	}
-	/* Clear 'ct.orig_proto' to mark the non-existence of conntrack
+	/* Clear 'ct_orig_proto' to mark the non-existence of conntrack
 	 * original direction key fields.
 	 */
-	key->ct.orig_proto = 0;
+	key->ct_orig_proto = 0;
 }
 
 /* Update 'key' based on skb->_nfct.  If 'post_ct' is true, then OVS has
@@ -228,7 +228,7 @@ static void ovs_ct_update_key(const struct sk_buff *skb,
 		if (ct->master)
 			state |= OVS_CS_F_RELATED;
 		if (keep_nat_flags) {
-			state |= key->ct.state & OVS_CS_F_NAT_MASK;
+			state |= key->ct_state & OVS_CS_F_NAT_MASK;
 		} else {
 			if (ct->status & IPS_SRC_NAT)
 				state |= OVS_CS_F_SRC_NAT;
@@ -259,11 +259,11 @@ void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
 int ovs_ct_put_key(const struct sw_flow_key *swkey,
 		   const struct sw_flow_key *output, struct sk_buff *skb)
 {
-	if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct.state))
+	if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
 		return -EMSGSIZE;
 
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
-	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct.zone))
+	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
 		return -EMSGSIZE;
 
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
@@ -275,14 +275,14 @@ int ovs_ct_put_key(const struct sw_flow_key *swkey,
 		    &output->ct.labels))
 		return -EMSGSIZE;
 
-	if (swkey->ct.orig_proto) {
+	if (swkey->ct_orig_proto) {
 		if (swkey->eth.type == htons(ETH_P_IP)) {
 			struct ovs_key_ct_tuple_ipv4 orig = {
 				output->ipv4.ct_orig.src,
 				output->ipv4.ct_orig.dst,
 				output->ct.orig_tp.src,
 				output->ct.orig_tp.dst,
-				output->ct.orig_proto,
+				output->ct_orig_proto,
 			};
 			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
 				    sizeof(orig), &orig))
@@ -293,7 +293,7 @@ int ovs_ct_put_key(const struct sw_flow_key *swkey,
 				IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst),
 				output->ct.orig_tp.src,
 				output->ct.orig_tp.dst,
-				output->ct.orig_proto,
+				output->ct_orig_proto,
 			};
 			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
 				    sizeof(orig), &orig))
@@ -612,11 +612,11 @@ static bool skb_nfct_cached(struct net *net,
 	 * due to an upcall.  If the connection was not confirmed, it is not
 	 * cached and needs to be run through conntrack again.
 	 */
-	if (!ct && key->ct.state & OVS_CS_F_TRACKED &&
-	    !(key->ct.state & OVS_CS_F_INVALID) &&
-	    key->ct.zone == info->zone.id) {
+	if (!ct && key->ct_state & OVS_CS_F_TRACKED &&
+	    !(key->ct_state & OVS_CS_F_INVALID) &&
+	    key->ct_zone == info->zone.id) {
 		ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
-					  !!(key->ct.state
+					  !!(key->ct_state
 					     & OVS_CS_F_NAT_MASK));
 		if (ct)
 			nf_ct_get(skb, &ctinfo);
@@ -740,7 +740,7 @@ static void ovs_nat_update_key(struct sw_flow_key *key,
 	if (maniptype == NF_NAT_MANIP_SRC) {
 		__be16 src;
 
-		key->ct.state |= OVS_CS_F_SRC_NAT;
+		key->ct_state |= OVS_CS_F_SRC_NAT;
 		if (key->eth.type == htons(ETH_P_IP))
 			key->ipv4.addr.src = ip_hdr(skb)->saddr;
 		else if (key->eth.type == htons(ETH_P_IPV6))
@@ -762,7 +762,7 @@ static void ovs_nat_update_key(struct sw_flow_key *key,
 	} else {
 		__be16 dst;
 
-		key->ct.state |= OVS_CS_F_DST_NAT;
+		key->ct_state |= OVS_CS_F_DST_NAT;
 		if (key->eth.type == htons(ETH_P_IP))
 			key->ipv4.addr.dst = ip_hdr(skb)->daddr;
 		else if (key->eth.type == htons(ETH_P_IPV6))
@@ -886,7 +886,7 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		 * NAT after the nf_conntrack_in() call.  We can actually clear
 		 * the whole state, as it will be re-initialized below.
 		 */
-		key->ct.state = 0;
+		key->ct_state = 0;
 
 		/* Update the key, but keep the NAT flags. */
 		ovs_ct_update_key(skb, info, key, true, true);
@@ -902,9 +902,9 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		 *
 		 * NAT will be done only if the CT action has NAT, and only
 		 * once per packet (per zone), as guarded by the NAT bits in
-		 * the key->ct.state.
+		 * the key->ct_state.
 		 */
-		if (info->nat && !(key->ct.state & OVS_CS_F_NAT_MASK) &&
+		if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
 		    (nf_ct_is_confirmed(ct) || info->commit) &&
 		    ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
 			return -EINVAL;

net/openvswitch/conntrack.h

@@ -76,14 +76,14 @@ static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 static inline void ovs_ct_fill_key(const struct sk_buff *skb,
 				   struct sw_flow_key *key)
 {
-	key->ct.state = 0;
-	key->ct.zone = 0;
+	key->ct_state = 0;
+	key->ct_zone = 0;
 	key->ct.mark = 0;
 	memset(&key->ct.labels, 0, sizeof(key->ct.labels));
-	/* Clear 'ct.orig_proto' to mark the non-existence of original
+	/* Clear 'ct_orig_proto' to mark the non-existence of original
 	 * direction key fields.
 	 */
-	key->ct.orig_proto = 0;
+	key->ct_orig_proto = 0;
 }
 
 static inline int ovs_ct_put_key(const struct sw_flow_key *swkey,

net/openvswitch/flow.h

@@ -85,6 +85,11 @@ struct sw_flow_key {
 		struct vlan_head cvlan;
 		__be16 type;		/* Ethernet frame type. */
 	} eth;
+	/* Filling a hole of two bytes. */
+	u8 ct_state;
+	u8 ct_orig_proto;		/* CT original direction tuple IP
+					 * protocol.
+					 */
 	union {
 		struct {
 			__be32 top_lse;	/* top label stack entry */
@@ -96,6 +101,7 @@ struct sw_flow_key {
 			u8     frag;	/* One of OVS_FRAG_TYPE_*. */
 		} ip;
 	};
+	u16 ct_zone;			/* Conntrack zone. */
 	struct {
 		__be16 src;		/* TCP/UDP/SCTP source port. */
 		__be16 dst;		/* TCP/UDP/SCTP destination port. */
@@ -138,16 +144,12 @@ struct sw_flow_key {
 		} ipv6;
 	};
 	struct {
-		/* Connection tracking fields. */
-		u8 state;
-		u8 orig_proto;		/* CT orig tuple IP protocol. */
-		u16 zone;
-		u32 mark;
+		/* Connection tracking fields not packed above. */
 		struct {
 			__be16 src;	/* CT orig tuple tp src port. */
 			__be16 dst;	/* CT orig tuple tp dst port. */
 		} orig_tp;
-
+		u32 mark;
 		struct ovs_key_ct_labels labels;
 	} ct;
 

net/openvswitch/flow_netlink.c

@@ -1072,14 +1072,14 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 			return -EINVAL;
 		}
 
-		SW_FLOW_KEY_PUT(match, ct.state, ct_state, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
 	}
 	if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
 	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
 		u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
 
-		SW_FLOW_KEY_PUT(match, ct.zone, ct_zone, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
 	}
 	if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
@@ -1107,7 +1107,7 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 		SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
 		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
 		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
-		SW_FLOW_KEY_PUT(match, ct.orig_proto, ct->ipv4_proto, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
 	}
 	if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
@@ -1123,7 +1123,7 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 				   is_mask);
 		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
 		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
-		SW_FLOW_KEY_PUT(match, ct.orig_proto, ct->ipv6_proto, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
 	}
 
@@ -1564,6 +1564,9 @@ int ovs_nla_get_flow_metadata(struct net *net,
 	memset(&match, 0, sizeof(match));
 	match.key = key;
 
+	key->ct_state = 0;
+	key->ct_zone = 0;
+	key->ct_orig_proto = 0;
 	memset(&key->ct, 0, sizeof(key->ct));
 	memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
 	memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));