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authorEric Dumazet <eric.dumazet@gmail.com>2010-10-07 10:44:07 +0000
committerDavid S. Miller <davem@davemloft.net>2010-10-11 12:54:04 -0700
commit0ed8ddf4045fcfcac36bad753dc4046118c603ec (patch)
treecf1d9eb14668c4d2257b3519ed7deec8c5cb396d /net/sched
parentd122179a3c0fdc71b88cb9e3605f372b1651a9ff (diff)
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neigh: Protect neigh->ha[] with a seqlock
Add a seqlock in struct neighbour to protect neigh->ha[], and avoid dirtying neighbour in stress situation (many different flows / dsts) Dirtying takes place because of read_lock(&n->lock) and n->used writes. Switching to a seqlock, and writing n->used only on jiffies changes permits less dirtying. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/sch_teql.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index feaabc1..401af95 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -241,11 +241,11 @@ __teql_resolve(struct sk_buff *skb, struct sk_buff *skb_res, struct net_device *
}
if (neigh_event_send(n, skb_res) == 0) {
int err;
+ char haddr[MAX_ADDR_LEN];
- read_lock(&n->lock);
- err = dev_hard_header(skb, dev, ntohs(skb->protocol),
- n->ha, NULL, skb->len);
- read_unlock(&n->lock);
+ neigh_ha_snapshot(haddr, n, dev);
+ err = dev_hard_header(skb, dev, ntohs(skb->protocol), haddr,
+ NULL, skb->len);
if (err < 0) {
neigh_release(n);