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Commit de27d001 authored by Vlad Yasevich's avatar Vlad Yasevich Committed by David S. Miller
Browse files

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: default avatarVlad Yasevich <vyasevic@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 22061d80

include/net/protocol.h

+12 −0
Original line number Diff line number Diff line
@@ -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);

net/ipv4/af_inet.c

+12 −0
Original line number Diff line number Diff line
@@ -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,

net/ipv4/protocol.c

+21 −0
Original line number Diff line number Diff line
@@ -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);