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net: Add net protocol offload registration infrustructure 

Create a new data structure for IPv4 protocols that holds GRO/GSO
callbacks and a new array to track the protocols that register GRO/GSO.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2012-11-15 08:49:12 +00:00 committed by David S. Miller
parent 22061d8014
commit de27d001d1
3 changed files with 45 additions and 0 deletions
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12
include/net/protocol.h
View File

@ -77,6 +77,15 @@ struct inet6_protocol {
#define INET6_PROTO_GSO_EXTHDR 0x4
#endif
struct net_offload {
int (*gso_send_check)(struct sk_buff *skb);
struct sk_buff *(*gso_segment)(struct sk_buff *skb,
netdev_features_t features);
struct sk_buff **(*gro_receive)(struct sk_buff **head,
struct sk_buff *skb);
int (*gro_complete)(struct sk_buff *skb);
};
/* This is used to register socket interfaces for IP protocols. */
struct inet_protosw {
struct list_head list;
@ -96,6 +105,7 @@ struct inet_protosw {
#define INET_PROTOSW_ICSK 0x04 /* Is this an inet_connection_sock? */
extern const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
#if IS_ENABLED(CONFIG_IPV6)
extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
@ -103,6 +113,8 @@ extern const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
extern int inet_add_protocol(const struct net_protocol *prot, unsigned char num);
extern int inet_del_protocol(const struct net_protocol *prot, unsigned char num);
extern int inet_add_offload(const struct net_offload *prot, unsigned char num);
extern int inet_del_offload(const struct net_offload *prot, unsigned char num);
extern void inet_register_protosw(struct inet_protosw *p);
extern void inet_unregister_protosw(struct inet_protosw *p);

12
net/ipv4/af_inet.c
View File

@ -1566,6 +1566,13 @@ static const struct net_protocol tcp_protocol = {
.netns_ok = 1,
};
static const struct net_offload tcp_offload = {
.gso_send_check = tcp_v4_gso_send_check,
.gso_segment = tcp_tso_segment,
.gro_receive = tcp4_gro_receive,
.gro_complete = tcp4_gro_complete,
};
static const struct net_protocol udp_protocol = {
.handler = udp_rcv,
.err_handler = udp_err,
@ -1575,6 +1582,11 @@ static const struct net_protocol udp_protocol = {
.netns_ok = 1,
};
static const struct net_offload udp_offload = {
.gso_send_check = udp4_ufo_send_check,
.gso_segment = udp4_ufo_fragment,
};
static const struct net_protocol icmp_protocol = {
.handler = icmp_rcv,
.err_handler = ping_err,

21
net/ipv4/protocol.c
View File

@ -29,6 +29,7 @@
#include <net/protocol.h>
const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
/*
* Add a protocol handler to the hash tables
@ -41,6 +42,13 @@ int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol)
}
EXPORT_SYMBOL(inet_add_protocol);
int inet_add_offload(const struct net_offload *prot, unsigned char protocol)
{
return !cmpxchg((const struct net_offload **)&inet_offloads[protocol],
NULL, prot) ? 0 : -1;
}
EXPORT_SYMBOL(inet_add_offload);
/*
* Remove a protocol from the hash tables.
*/
@ -57,3 +65,16 @@ int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol)
return ret;
}
EXPORT_SYMBOL(inet_del_protocol);
int inet_del_offload(const struct net_offload *prot, unsigned char protocol)
{
int ret;
ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol],
prot, NULL) == prot) ? 0 : -1;
synchronize_net();
return ret;
}
EXPORT_SYMBOL(inet_del_offload);