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net: Add helper flowi4_init_output(). 

On-stack initialization via assignment of flow structures are
expensive because GCC emits a memset() to clear the entire
structure out no matter what.

Add a helper for ipv4 output flow key setup which we can use to avoid
the memset.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-03-31 04:52:14 -07:00
parent 0a5c047507
commit 83229aa5e2
1 changed files with 21 additions and 0 deletions
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21
include/net/flow.h
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@ -70,6 +70,27 @@ struct flowi4 {
#define fl4_gre_key uli.gre_key
};
static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
__u32 mark, __u8 tos, __u8 scope,
__u8 proto, __u8 flags,
__be32 daddr, __be32 saddr,
__be16 dport, __be32 sport)
{
fl4->flowi4_oif = oif;
fl4->flowi4_iif = 0;
fl4->flowi4_mark = mark;
fl4->flowi4_tos = tos;
fl4->flowi4_scope = scope;
fl4->flowi4_proto = proto;
fl4->flowi4_flags = flags;
fl4->flowi4_secid = 0;
fl4->daddr = daddr;
fl4->saddr = saddr;
fl4->fl4_sport = sport;
fl4->fl4_dport = dport;
}
struct flowi6 {
struct flowi_common __fl_common;
#define flowi6_oif __fl_common.flowic_oif