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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-03 04:09:10 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-03 20:01:52 -0700
commitfaa9dcf793beba05f7178b63a59eaa3ca5175b6a (patch)
tree0addd3f98e77ab34a8686eaf6855896efe2f9c4f /net/ipv4
parent4736022844fe694c4ee971fa2b6c1cb38dadbc78 (diff)
arp: RCU changes
Avoid two atomic ops in arp_fwd_proxy() Avoid two atomic ops in arp_process() Valid optims since arp_rcv() is run under rcu_read_lock() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/arp.c11
1 files changed, 4 insertions, 7 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index f094b75810db..917d2d66162e 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -545,10 +545,10 @@ static inline int arp_fwd_proxy(struct in_device *in_dev,
/* place to check for proxy_arp for routes */
- if ((out_dev = in_dev_get(rt->u.dst.dev)) != NULL) {
+ out_dev = __in_dev_get_rcu(rt->u.dst.dev);
+ if (out_dev)
omi = IN_DEV_MEDIUM_ID(out_dev);
- in_dev_put(out_dev);
- }
+
return (omi != imi && omi != -1);
}
@@ -741,7 +741,7 @@ void arp_send(int type, int ptype, __be32 dest_ip,
static int arp_process(struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
- struct in_device *in_dev = in_dev_get(dev);
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
struct arphdr *arp;
unsigned char *arp_ptr;
struct rtable *rt;
@@ -890,7 +890,6 @@ static int arp_process(struct sk_buff *skb)
arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr,sha);
} else {
pneigh_enqueue(&arp_tbl, in_dev->arp_parms, skb);
- in_dev_put(in_dev);
return 0;
}
goto out;
@@ -936,8 +935,6 @@ static int arp_process(struct sk_buff *skb)
}
out:
- if (in_dev)
- in_dev_put(in_dev);
consume_skb(skb);
return 0;
}