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net: Abstract default MTU metric calculation behind an accessor.

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Like RTAX_ADVMSS, make the default calculation go through a dst_ops
method rather than caching the computation in the routing cache
entries.

Now dst metrics are pretty much left as-is when new entries are
created, thus optimizing metric sharing becomes a real possibility.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2010-12-14 13:01:14 -08:00
parent 9fe146aef4
commit d33e455337
6 changed files with 60 additions and 39 deletions
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15
include/net/dst.h
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@ -113,7 +113,8 @@ static inline u32
dst_metric(const struct dst_entry *dst, const int metric)
{
WARN_ON_ONCE(metric == RTAX_HOPLIMIT ||
metric == RTAX_ADVMSS);
metric == RTAX_ADVMSS ||
metric == RTAX_MTU);
return dst_metric_raw(dst, metric);
}
@ -156,11 +157,11 @@ dst_feature(const struct dst_entry *dst, u32 feature)
static inline u32 dst_mtu(const struct dst_entry *dst)
{
u32 mtu = dst_metric(dst, RTAX_MTU);
/*
* Alexey put it here, so ask him about it :)
*/
barrier();
u32 mtu = dst_metric_raw(dst, RTAX_MTU);
if (!mtu)
mtu = dst->ops->default_mtu(dst);
return mtu;
}
@ -186,7 +187,7 @@ dst_allfrag(const struct dst_entry *dst)
}
static inline int
dst_metric_locked(struct dst_entry *dst, int metric)
dst_metric_locked(const struct dst_entry *dst, int metric)
{
return dst_metric(dst, RTAX_LOCK) & (1<<metric);
}