diff mbox

[net-next-2.6] arp: RCU changes

Message ID 1275574150.2456.52.camel@edumazet-laptop
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Eric Dumazet June 3, 2010, 2:09 p.m. UTC 
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>
---
 net/ipv4/arp.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)



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Comments

David Miller June 4, 2010, 3:04 a.m. UTC | #1 
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 03 Jun 2010 16:09:10 +0200

> 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>

Applied.
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diff mbox

Patch

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index f094b75..917d2d6 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;
 }