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linux/include/net/ip6_route.h
Herbert Xu f83ef8c0b5 [IPV6]: Added GSO support for TCPv6 
This patch adds GSO support for IPv6 and TCPv6.  This is based on a patch
by Ananda Raju <Ananda.Raju@neterion.com>.  His original description is:

	This patch enables TSO over IPv6. Currently Linux network stacks
	restricts TSO over IPv6 by clearing of the NETIF_F_TSO bit from
	"dev->features". This patch will remove this restriction.

	This patch will introduce a new flag NETIF_F_TSO6 which will be used
	to check whether device supports TSO over IPv6. If device support TSO
	over IPv6 then we don't clear of NETIF_F_TSO and which will make the
	TCP layer to create TSO packets. Any device supporting TSO over IPv6
	will set NETIF_F_TSO6 flag in "dev->features" along with NETIF_F_TSO.

	In case when user disables TSO using ethtool, NETIF_F_TSO will get
	cleared from "dev->features". So even if we have NETIF_F_TSO6 we don't
	get TSO packets created by TCP layer.

	SKB_GSO_TCPV4 renamed to SKB_GSO_TCP to make it generic GSO packet.
	SKB_GSO_UDPV4 renamed to SKB_GSO_UDP as UFO is not a IPv4 feature.
	UFO is supported over IPv6 also

	The following table shows there is significant improvement in
	throughput with normal frames and CPU usage for both normal and jumbo.

	--------------------------------------------------
	|          |     1500        |      9600         |
	|          ------------------|-------------------|
	|          | thru     CPU    |  thru     CPU     |
	--------------------------------------------------
	| TSO OFF  | 2.00   5.5% id  |  5.66   20.0% id  |
	--------------------------------------------------
	| TSO ON   | 2.63   78.0 id  |  5.67   39.0% id  |
	--------------------------------------------------

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-30 14:12:10 -07:00

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#ifndef _NET_IP6_ROUTE_H
#define _NET_IP6_ROUTE_H
#define IP6_RT_PRIO_FW 16
#define IP6_RT_PRIO_USER 1024
#define IP6_RT_PRIO_ADDRCONF 256
#define IP6_RT_PRIO_KERN 512
#define IP6_RT_FLOW_MASK 0x00ff
struct route_info {
__u8 type;
__u8 length;
__u8 prefix_len;
#if defined(__BIG_ENDIAN_BITFIELD)
__u8 reserved_h:3,
route_pref:2,
reserved_l:3;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
__u8 reserved_l:3,
route_pref:2,
reserved_h:3;
#endif
__u32 lifetime;
__u8 prefix[0]; /* 0,8 or 16 */
};
#ifdef __KERNEL__
#include <net/flow.h>
#include <net/ip6_fib.h>
#include <net/sock.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
struct pol_chain {
int type;
int priority;
struct fib6_node *rules;
struct pol_chain *next;
};
extern struct rt6_info ip6_null_entry;
extern int ip6_rt_gc_interval;
extern void ip6_route_input(struct sk_buff *skb);
extern struct dst_entry * ip6_route_output(struct sock *sk,
struct flowi *fl);
extern int ip6_route_me_harder(struct sk_buff *skb);
extern void ip6_route_init(void);
extern void ip6_route_cleanup(void);
extern int ipv6_route_ioctl(unsigned int cmd, void __user *arg);
extern int ip6_route_add(struct in6_rtmsg *rtmsg,
struct nlmsghdr *,
void *rtattr,
struct netlink_skb_parms *req);
extern int ip6_ins_rt(struct rt6_info *,
struct nlmsghdr *,
void *rtattr,
struct netlink_skb_parms *req);
extern int ip6_del_rt(struct rt6_info *,
struct nlmsghdr *,
void *rtattr,
struct netlink_skb_parms *req);
extern int ip6_rt_addr_add(struct in6_addr *addr,
struct net_device *dev,
int anycast);
extern int ip6_rt_addr_del(struct in6_addr *addr,
struct net_device *dev);
extern void rt6_sndmsg(int type, struct in6_addr *dst,
struct in6_addr *src,
struct in6_addr *gw,
struct net_device *dev,
int dstlen, int srclen,
int metric, __u32 flags);
extern struct rt6_info *rt6_lookup(struct in6_addr *daddr,
struct in6_addr *saddr,
int oif, int flags);
extern struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
struct neighbour *neigh,
struct in6_addr *addr,
int (*output)(struct sk_buff *));
extern int ndisc_dst_gc(int *more);
extern void fib6_force_start_gc(void);
extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
const struct in6_addr *addr,
int anycast);
/*
* support functions for ND
*
*/
extern struct rt6_info * rt6_get_dflt_router(struct in6_addr *addr,
struct net_device *dev);
extern struct rt6_info * rt6_add_dflt_router(struct in6_addr *gwaddr,
struct net_device *dev,
unsigned int pref);
extern void rt6_purge_dflt_routers(void);
extern int rt6_route_rcv(struct net_device *dev,
u8 *opt, int len,
struct in6_addr *gwaddr);
extern void rt6_redirect(struct in6_addr *dest,
struct in6_addr *saddr,
struct neighbour *neigh,
u8 *lladdr,
int on_link);
extern void rt6_pmtu_discovery(struct in6_addr *daddr,
struct in6_addr *saddr,
struct net_device *dev,
u32 pmtu);
struct nlmsghdr;
struct netlink_callback;
extern int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
extern int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
extern int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
extern int inet6_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
extern void rt6_ifdown(struct net_device *dev);
extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
extern rwlock_t rt6_lock;
/*
* Store a destination cache entry in a socket
*/
static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
struct in6_addr *daddr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct rt6_info *rt = (struct rt6_info *) dst;
write_lock(&sk->sk_dst_lock);
sk_setup_caps(sk, dst);
np->daddr_cache = daddr;
np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
write_unlock(&sk->sk_dst_lock);
}
static inline int ipv6_unicast_destination(struct sk_buff *skb)
{
struct rt6_info *rt = (struct rt6_info *) skb->dst;
return rt->rt6i_flags & RTF_LOCAL;
}
#endif
#endif
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