net: gro: move two declarations to include/net/gro.h

Move gro_find_receive_by_type() and gro_find_complete_by_type()
to include/net/gro.h where they belong.

Also use _NET_GRO_H instead of _NET_IPV6_GRO_H to protect
include/net/gro.h from multiple inclusions.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240308102230.296224-1-edumazet@google.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/netdevice.h

@@ -3901,8 +3901,6 @@ void napi_gro_flush(struct napi_struct *napi, bool flush_old);
 struct sk_buff *napi_get_frags(struct napi_struct *napi);
 void napi_get_frags_check(struct napi_struct *napi);
 gro_result_t napi_gro_frags(struct napi_struct *napi);
-struct packet_offload *gro_find_receive_by_type(__be16 type);
-struct packet_offload *gro_find_complete_by_type(__be16 type);
 
 static inline void napi_free_frags(struct napi_struct *napi)
 {

include/net/gro.h

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 
-#ifndef _NET_IPV6_GRO_H
-#define _NET_IPV6_GRO_H
+#ifndef _NET_GRO_H
+#define _NET_GRO_H
 
 #include <linux/indirect_call_wrapper.h>
 #include <linux/ip.h>
@@ -494,4 +494,7 @@ static inline void inet6_get_iif_sdif(const struct sk_buff *skb, int *iif, int *
 #endif
 }
 
-#endif /* _NET_IPV6_GRO_H */
+struct packet_offload *gro_find_receive_by_type(__be16 type);
+struct packet_offload *gro_find_complete_by_type(__be16 type);
+
+#endif /* _NET_GRO_H */