net: Embed hh_cache inside of struct neighbour.
Now that there is a one-to-one correspondance between neighbour
and hh_cache entries, we no longer need:
1) dynamic allocation
2) attachment to dst->hh
3) refcounting
Initialization of the hh_cache entry is indicated by hh_len
being non-zero, and such initialization is always done with
the neighbour's lock held as a writer.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 54119d5..a621b96 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -182,6 +182,7 @@
struct rtable *rt = (struct rtable *)dst;
struct net_device *dev = dst->dev;
unsigned int hh_len = LL_RESERVED_SPACE(dev);
+ struct neighbour *neigh;
if (rt->rt_type == RTN_MULTICAST) {
IP_UPD_PO_STATS(dev_net(dev), IPSTATS_MIB_OUTMCAST, skb->len);
@@ -203,11 +204,14 @@
skb = skb2;
}
- if (dst->hh)
- return neigh_hh_output(dst->hh, skb);
- else if (dst->neighbour)
- return dst->neighbour->output(skb);
-
+ neigh = dst->neighbour;
+ if (neigh) {
+ struct hh_cache *hh = &neigh->hh;
+ if (hh->hh_len)
+ return neigh_hh_output(hh, skb);
+ else
+ return dst->neighbour->output(skb);
+ }
if (net_ratelimit())
printk(KERN_DEBUG "ip_finish_output2: No header cache and no neighbour!\n");
kfree_skb(skb);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c6388e8..a52bb74 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -426,9 +426,10 @@
(int)((dst_metric(&r->dst, RTAX_RTT) >> 3) +
dst_metric(&r->dst, RTAX_RTTVAR)),
r->rt_key_tos,
- r->dst.hh ? atomic_read(&r->dst.hh->hh_refcnt) : -1,
- r->dst.hh ? (r->dst.hh->hh_output ==
- dev_queue_xmit) : 0,
+ -1,
+ (r->dst.neighbour ?
+ (r->dst.neighbour->hh.hh_output ==
+ dev_queue_xmit) : 0),
r->rt_spec_dst, &len);
seq_printf(seq, "%*s\n", 127 - len, "");