ipv6: move tcpv6_protocol and udpv6_protocol to net_hotdata

These structures are read in rx path, move them to net_hotdata
for better cache locality.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20240306160031.874438-13-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/hotdata.h

@@ -14,6 +14,10 @@ struct net_hotdata {
 	struct net_offload 	udpv4_offload;
 	struct packet_offload	ipv6_packet_offload;
 	struct net_offload	tcpv6_offload;
+#if IS_ENABLED(CONFIG_IPV6)
+	struct inet6_protocol	tcpv6_protocol;
+	struct inet6_protocol	udpv6_protocol;
+#endif
 	struct net_offload	udpv6_offload;
 #endif
 	struct list_head	offload_base;

net/ipv6/tcp_ipv6.c

@@ -58,6 +58,7 @@
 #include <net/timewait_sock.h>
 #include <net/inet_common.h>
 #include <net/secure_seq.h>
+#include <net/hotdata.h>
 #include <net/busy_poll.h>
 
 #include <linux/proc_fs.h>
@@ -2367,11 +2368,6 @@ struct proto tcpv6_prot = {
 };
 EXPORT_SYMBOL_GPL(tcpv6_prot);
 
-static const struct inet6_protocol tcpv6_protocol = {
-	.handler	=	tcp_v6_rcv,
-	.err_handler	=	tcp_v6_err,
-	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
-};
 
 static struct inet_protosw tcpv6_protosw = {
 	.type		=	SOCK_STREAM,
@@ -2408,7 +2404,12 @@ int __init tcpv6_init(void)
 {
 	int ret;
 
-	ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
+	net_hotdata.tcpv6_protocol = (struct inet6_protocol) {
+		.handler     = tcp_v6_rcv,
+		.err_handler = tcp_v6_err,
+		.flags	     = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
+	};
+	ret = inet6_add_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP);
 	if (ret)
 		goto out;
 
@@ -2433,7 +2434,7 @@ int __init tcpv6_init(void)
 out_tcpv6_protosw:
 	inet6_unregister_protosw(&tcpv6_protosw);
 out_tcpv6_protocol:
-	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
+	inet6_del_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP);
 	goto out;
 }
 
@@ -2441,5 +2442,5 @@ void tcpv6_exit(void)
 {
 	unregister_pernet_subsys(&tcpv6_net_ops);
 	inet6_unregister_protosw(&tcpv6_protosw);
-	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
+	inet6_del_protocol(&net_hotdata.tcpv6_protocol, IPPROTO_TCP);
 }

net/ipv6/udp.c

@@ -1702,11 +1702,6 @@ int udpv6_getsockopt(struct sock *sk, int level, int optname,
 	return ipv6_getsockopt(sk, level, optname, optval, optlen);
 }
 
-static const struct inet6_protocol udpv6_protocol = {
-	.handler	=	udpv6_rcv,
-	.err_handler	=	udpv6_err,
-	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
-};
 
 /* ------------------------------------------------------------------------ */
 #ifdef CONFIG_PROC_FS
@@ -1803,7 +1798,12 @@ int __init udpv6_init(void)
 {
 	int ret;
 
-	ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
+	net_hotdata.udpv6_protocol = (struct inet6_protocol) {
+		.handler     = udpv6_rcv,
+		.err_handler = udpv6_err,
+		.flags	     = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
+	};
+	ret = inet6_add_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP);
 	if (ret)
 		goto out;
 
@@ -1814,12 +1814,12 @@ int __init udpv6_init(void)
 	return ret;
 
 out_udpv6_protocol:
-	inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
+	inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP);
 	goto out;
 }
 
 void udpv6_exit(void)
 {
 	inet6_unregister_protosw(&udpv6_protosw);
-	inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
+	inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP);
 }