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net: Pre-COW metrics for TCP.

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TCP is going to record metrics for the connection,
so pre-COW the route metrics at route cache entry
creation time.

This avoids several atomic operations that have to
occur if we COW the metrics after the entry reaches
global visibility.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-01-27 22:01:53 -08:00
parent 8571a19c4a
commit a4daad6b09
4 changed files with 36 additions and 5 deletions
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3
include/net/flow.h
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@ -48,7 +48,8 @@ struct flowi {
__u8 proto;
__u8 flags;
#define FLOWI_FLAG_ANYSRC 0x01
#define FLOWI_FLAG_ANYSRC 0x01
#define FLOWI_FLAG_PRECOW_METRICS 0x02
union {
struct {
__be16 sport;