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Date: Tue, 03 Jul 2012 02:47:04 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 17/19] ipv4: No need to set generic neighbour pointer.
Nobody reads it any longer.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
net/ipv4/route.c | 62 +++---------------------------------------------------
1 file changed, 3 insertions(+), 59 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 7453dfc..72e88c2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1111,16 +1111,6 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
return neigh_create(&arp_tbl, pkey, dev);
}
-static int rt_bind_neighbour(struct rtable *rt)
-{
- struct neighbour *n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);
- if (IS_ERR(n))
- return PTR_ERR(n);
- dst_set_neighbour(&rt->dst, n);
-
- return 0;
-}
-
static struct rtable *rt_intern_hash(unsigned int hash, struct rtable *rt,
struct sk_buff *skb, int ifindex)
{
@@ -1129,7 +1119,6 @@ static struct rtable *rt_intern_hash(unsigned int hash, struct rtable *rt,
unsigned long now;
u32 min_score;
int chain_length;
- int attempts = !in_softirq();
restart:
chain_length = 0;
@@ -1156,15 +1145,6 @@ restart:
*/
rt->dst.flags |= DST_NOCACHE;
- if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
- int err = rt_bind_neighbour(rt);
- if (err) {
- net_warn_ratelimited("Neighbour table failure & not caching routes\n");
- ip_rt_put(rt);
- return ERR_PTR(err);
- }
- }
-
goto skip_hashing;
}
@@ -1247,40 +1227,6 @@ restart:
}
}
- /* Try to bind route to arp only if it is output
- route or unicast forwarding path.
- */
- if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
- int err = rt_bind_neighbour(rt);
- if (err) {
- spin_unlock_bh(rt_hash_lock_addr(hash));
-
- if (err != -ENOBUFS) {
- rt_drop(rt);
- return ERR_PTR(err);
- }
-
- /* Neighbour tables are full and nothing
- can be released. Try to shrink route cache,
- it is most likely it holds some neighbour records.
- */
- if (attempts-- > 0) {
- int saved_elasticity = ip_rt_gc_elasticity;
- int saved_int = ip_rt_gc_min_interval;
- ip_rt_gc_elasticity = 1;
- ip_rt_gc_min_interval = 0;
- rt_garbage_collect(&ipv4_dst_ops);
- ip_rt_gc_min_interval = saved_int;
- ip_rt_gc_elasticity = saved_elasticity;
- goto restart;
- }
-
- net_warn_ratelimited("Neighbour table overflow\n");
- rt_drop(rt);
- return ERR_PTR(-ENOBUFS);
- }
- }
-
rt->dst.rt_next = rt_hash_table[hash].chain;
/*
@@ -1388,26 +1334,24 @@ static void check_peer_redir(struct dst_entry *dst, struct inet_peer *peer)
{
struct rtable *rt = (struct rtable *) dst;
__be32 orig_gw = rt->rt_gateway;
- struct neighbour *n, *old_n;
+ struct neighbour *n;
dst_confirm(&rt->dst);
rt->rt_gateway = peer->redirect_learned.a4;
n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);
- if (IS_ERR(n)) {
+ if (!n) {
rt->rt_gateway = orig_gw;
return;
}
- old_n = xchg(&rt->dst._neighbour, n);
- if (old_n)
- neigh_release(old_n);
if (!(n->nud_state & NUD_VALID)) {
neigh_event_send(n, NULL);
} else {
rt->rt_flags |= RTCF_REDIRECTED;
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n);
}
+ neigh_release(n);
}
/* called in rcu_read_lock() section */
--
1.7.10
--
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