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[NET]: Convert hh_lock to seqlock.

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The hard header cache is in the main output path, so using
seqlock instead of reader/writer lock should reduce overhead.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2006-12-07 15:08:17 -08:00
committed by David S. Miller
parent eb991b3938
commit 3644f0cee7
5 changed files with 31 additions and 29 deletions
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18
include/net/neighbour.h
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@@ -309,6 +309,24 @@ static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
return 0;
}
static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
{
unsigned seq;
int hh_len;
do {
int hh_alen;
seq = read_seqbegin(&hh->hh_lock);
hh_len = hh->hh_len;
hh_alen = HH_DATA_ALIGN(hh_len);
memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
} while (read_seqretry(&hh->hh_lock, seq));
skb_push(skb, hh_len);
return hh->hh_output(skb);
}
static inline struct neighbour *
__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
{