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ipv4: Optimize flow initialization in input route lookup. 

Like in commit 44713b67db
("ipv4: Optimize flow initialization in output route lookup."
we can optimize the on-stack flow setup to only initialize
the members which are actually used.

Otherwise we bzero the entire structure, then initialize
explicitly the first half of it.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-03-09 20:42:07 -08:00
parent 2f4e1b3970
commit 67e28ffd86
1 changed files with 8 additions and 6 deletions
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14
net/ipv4/route.c
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@ -2081,12 +2081,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
{
struct fib_result res;
struct in_device *in_dev = __in_dev_get_rcu(dev);
struct flowi fl = { .fl4_dst = daddr,
.fl4_src = saddr,
.fl4_tos = tos,
.fl4_scope = RT_SCOPE_UNIVERSE,
.mark = skb->mark,
.iif = dev->ifindex };
struct flowi fl;
unsigned flags = 0;
u32 itag = 0;
struct rtable * rth;
@ -2123,6 +2118,13 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
/*
* Now we are ready to route packet.
*/
fl.oif = 0;
fl.iif = dev->ifindex;
fl.mark = skb->mark;
fl.fl4_dst = daddr;
fl.fl4_src = saddr;
fl.fl4_tos = tos;
fl.fl4_scope = RT_SCOPE_UNIVERSE;
err = fib_lookup(net, &fl, &res);
if (err != 0) {
if (!IN_DEV_FORWARD(in_dev))