net: move ip_packet_offload and ipv6_packet_offload to net_hotdata

These structures are used in GRO and GSO paths.

v2: ipv6_packet_offload definition depends on CONFIG_INET
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/20240306160031.874438-7-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/hotdata.h

@@ -3,9 +3,14 @@
 #define _NET_HOTDATA_H
 
 #include <linux/types.h>
+#include <linux/netdevice.h>
 
 /* Read mostly data used in network fast paths. */
 struct net_hotdata {
+#if IS_ENABLED(CONFIG_INET)
+	struct packet_offload	ip_packet_offload;
+	struct packet_offload	ipv6_packet_offload;
+#endif
 	struct list_head	offload_base;
 	struct list_head	ptype_all;
 	int			gro_normal_batch;

net/ipv4/af_inet.c

@@ -1904,14 +1904,6 @@ static int ipv4_proc_init(void);
  *	IP protocol layer initialiser
  */
 
-static struct packet_offload ip_packet_offload __read_mostly = {
-	.type = cpu_to_be16(ETH_P_IP),
-	.callbacks = {
-		.gso_segment = inet_gso_segment,
-		.gro_receive = inet_gro_receive,
-		.gro_complete = inet_gro_complete,
-	},
-};
 
 static const struct net_offload ipip_offload = {
 	.callbacks = {
@@ -1938,7 +1930,15 @@ static int __init ipv4_offload_init(void)
 	if (ipip_offload_init() < 0)
 		pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
 
-	dev_add_offload(&ip_packet_offload);
+	net_hotdata.ip_packet_offload = (struct packet_offload) {
+		.type = cpu_to_be16(ETH_P_IP),
+		.callbacks = {
+			.gso_segment = inet_gso_segment,
+			.gro_receive = inet_gro_receive,
+			.gro_complete = inet_gro_complete,
+		},
+	};
+	dev_add_offload(&net_hotdata.ip_packet_offload);
 	return 0;
 }
 

net/ipv6/ip6_offload.c

@@ -419,14 +419,6 @@ static int ip4ip6_gro_complete(struct sk_buff *skb, int nhoff)
 	return inet_gro_complete(skb, nhoff);
 }
 
-static struct packet_offload ipv6_packet_offload __read_mostly = {
-	.type = cpu_to_be16(ETH_P_IPV6),
-	.callbacks = {
-		.gso_segment = ipv6_gso_segment,
-		.gro_receive = ipv6_gro_receive,
-		.gro_complete = ipv6_gro_complete,
-	},
-};
 
 static struct sk_buff *sit_gso_segment(struct sk_buff *skb,
 				       netdev_features_t features)
@@ -486,7 +478,15 @@ static int __init ipv6_offload_init(void)
 	if (ipv6_exthdrs_offload_init() < 0)
 		pr_crit("%s: Cannot add EXTHDRS protocol offload\n", __func__);
 
-	dev_add_offload(&ipv6_packet_offload);
+	net_hotdata.ipv6_packet_offload = (struct packet_offload) {
+		.type = cpu_to_be16(ETH_P_IPV6),
+		.callbacks = {
+			.gso_segment = ipv6_gso_segment,
+			.gro_receive = ipv6_gro_receive,
+			.gro_complete = ipv6_gro_complete,
+		},
+	};
+	dev_add_offload(&net_hotdata.ipv6_packet_offload);
 
 	inet_add_offload(&sit_offload, IPPROTO_IPV6);
 	inet6_add_offload(&ip6ip6_offload, IPPROTO_IPV6);