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ipv4: Inline neigh binding.

Browse source 
Get rid of all of the useless and costly indirection
by doing the neigh hash table lookup directly inside
of the neighbour binding.

Rename from arp_bind_neighbour to rt_bind_neighbour.

Use new helpers {__,}ipv4_neigh_lookup()

In rt_bind_neighbour() get rid of useless tests which
are never true in the context this function is called,
namely dev is never NULL and the dst->neighbour is
always NULL.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Miller 2011-07-11 22:44:24 +00:00 committed by David S. Miller
parent e5b1de1f5e
commit 3769cffb1c
3 changed files with 59 additions and 28 deletions
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33
include/net/arp.h
View file

@ -15,6 +15,38 @@ static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd
return val * hash_rnd;
}
static inline struct neighbour *__ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, u32 key)
{
struct neigh_hash_table *nht;
struct neighbour *n;
u32 hash_val;
rcu_read_lock_bh();
nht = rcu_dereference_bh(tbl->nht);
hash_val = arp_hashfn(key, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
n != NULL;
n = rcu_dereference_bh(n->next)) {
if (n->dev == dev && *(u32 *)n->primary_key == key) {
if (!atomic_inc_not_zero(&n->refcnt))
n = NULL;
break;
}
}
rcu_read_unlock_bh();
return n;
}
static inline struct neighbour *ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const __be32 *pkey)
{
struct neighbour *n = __ipv4_neigh_lookup(tbl, dev,
*(__force u32 *)pkey);
if (n)
return n;
return neigh_create(tbl, pkey, dev);
}
extern void arp_init(void);
extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
@ -22,7 +54,6 @@ extern void arp_send(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw,
const unsigned char *src_hw, const unsigned char *th);
extern int arp_bind_neighbour(struct dst_entry *dst);
extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
extern void arp_ifdown(struct net_device *dev);

24
net/ipv4/arp.c
View file

@ -517,30 +517,6 @@ EXPORT_SYMBOL(arp_find);
/* END OF OBSOLETE FUNCTIONS */
int arp_bind_neighbour(struct dst_entry *dst)
{
struct net_device *dev = dst->dev;
struct neighbour *n = dst->neighbour;
if (dev == NULL)
return -EINVAL;
if (n == NULL) {
__be32 nexthop = ((struct rtable *)dst)->rt_gateway;
if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
nexthop = 0;
n = __neigh_lookup_errno(
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
dev->type == ARPHRD_ATM ?
clip_tbl_hook :
#endif
&arp_tbl, &nexthop, dev);
if (IS_ERR(n))
return PTR_ERR(n);
dst->neighbour = n;
}
return 0;
}
/*
* Check if we can use proxy ARP for this path
*/

30
net/ipv4/route.c
View file

@ -108,6 +108,7 @@
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
#include <net/atmclip.h>
#define RT_FL_TOS(oldflp4) \
((u32)(oldflp4->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)))
@ -1006,6 +1007,29 @@ static int slow_chain_length(const struct rtable *head)
return length >> FRACT_BITS;
}
static int rt_bind_neighbour(struct rtable *rt)
{
static const __be32 inaddr_any = 0;
struct net_device *dev = rt->dst.dev;
struct neigh_table *tbl = &arp_tbl;
const __be32 *nexthop;
struct neighbour *n;
#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
if (dev->type == ARPHRD_ATM)
tbl = clip_tbl_hook;
#endif
nexthop = &rt->rt_gateway;
if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
nexthop = &inaddr_any;
n = ipv4_neigh_lookup(tbl, dev, nexthop);
if (IS_ERR(n))
return PTR_ERR(n);
rt->dst.neighbour = n;
return 0;
}
static struct rtable *rt_intern_hash(unsigned hash, struct rtable *rt,
struct sk_buff *skb, int ifindex)
{
@ -1042,7 +1066,7 @@ restart:
rt->dst.flags |= DST_NOCACHE;
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
int err = arp_bind_neighbour(&rt->dst);
int err = rt_bind_neighbour(rt);
if (err) {
if (net_ratelimit())
printk(KERN_WARNING
@ -1138,7 +1162,7 @@ restart:
route or unicast forwarding path.
*/
if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
int err = arp_bind_neighbour(&rt->dst);
int err = rt_bind_neighbour(rt);
if (err) {
spin_unlock_bh(rt_hash_lock_addr(hash));
@ -1599,7 +1623,7 @@ static int check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
rt->dst.neighbour = NULL;
rt->rt_gateway = peer->redirect_learned.a4;
if (arp_bind_neighbour(&rt->dst) ||
if (rt_bind_neighbour(rt) ||
!(rt->dst.neighbour->nud_state & NUD_VALID)) {
if (rt->dst.neighbour)
neigh_event_send(rt->dst.neighbour, NULL);