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gre_offload: statically build GRE offloading support 

GRO/GSO layers can be enabled on a node, even if said
node is only forwarding packets.

This patch permits GSO (and upcoming GRO) support for GRE
encapsulated packets, even if the host has no GRE tunnel setup.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: H.K. Jerry Chu <hkchu@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2014-01-06 14:03:07 -08:00 committed by David S. Miller
parent 0e5959346c
commit 438e38fadc
4 changed files with 7 additions and 16 deletions
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3
include/net/gre.h
View File

@ -33,9 +33,6 @@ struct gre_cisco_protocol {
int gre_cisco_register(struct gre_cisco_protocol *proto);
int gre_cisco_unregister(struct gre_cisco_protocol *proto);
int gre_offload_init(void);
void gre_offload_exit(void);
void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
int hdr_len);

4
net/ipv4/Makefile
View File

@ -11,7 +11,7 @@ obj-y := route.o inetpeer.o protocol.o \
tcp_offload.o datagram.o raw.o udp.o udplite.o \
udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
fib_frontend.o fib_semantics.o fib_trie.o \
inet_fragment.o ping.o ip_tunnel_core.o
inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o
obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
@ -19,7 +19,7 @@ obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
obj-$(CONFIG_IP_MROUTE) += ipmr.o
obj-$(CONFIG_NET_IPIP) += ipip.o
gre-y := gre_demux.o gre_offload.o
gre-y := gre_demux.o
obj-$(CONFIG_NET_IPGRE_DEMUX) += gre.o
obj-$(CONFIG_NET_IPGRE) += ip_gre.o
obj-$(CONFIG_NET_IPVTI) += ip_vti.o

9
net/ipv4/gre_demux.c
View File

@ -355,14 +355,7 @@ static int __init gre_init(void)
goto err_gre;
}
if (gre_offload_init()) {
pr_err("can't add protocol offload\n");
goto err_gso;
}
return 0;
err_gso:
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
err_gre:
inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
err:
@ -371,8 +364,6 @@ err:
static void __exit gre_exit(void)
{
gre_offload_exit();
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
}

7
net/ipv4/gre_offload.c
View File

@ -123,12 +123,15 @@ static const struct net_offload gre_offload = {
},
};
int __init gre_offload_init(void)
static int __init gre_offload_init(void)
{
return inet_add_offload(&gre_offload, IPPROTO_GRE);
}
void __exit gre_offload_exit(void)
static void __exit gre_offload_exit(void)
{
inet_del_offload(&gre_offload, IPPROTO_GRE);
}
module_init(gre_offload_init);
module_exit(gre_offload_exit);