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Subject[PATCH net-next] net: copy routing table more efficiently in rt_dst_clone
Instead of copying field-by-field, copy the entire struct at once. This
should lead to a performance improvment in rt_dst_clone.

Signed-off-by: Oliver Crumrine <ozlinuxc@gmail.com>
---
net/ipv4/route.c | 16 +---------------
1 file changed, 1 insertion(+), 15 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 16615d107cf0..ebb17c3a0dec 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1664,22 +1664,8 @@ struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt)
rt->dst.flags);

if (new_rt) {
+ *new_rt = *rt;
new_rt->rt_genid = rt_genid_ipv4(dev_net(dev));
- new_rt->rt_flags = rt->rt_flags;
- new_rt->rt_type = rt->rt_type;
- new_rt->rt_is_input = rt->rt_is_input;
- new_rt->rt_iif = rt->rt_iif;
- new_rt->rt_pmtu = rt->rt_pmtu;
- new_rt->rt_mtu_locked = rt->rt_mtu_locked;
- new_rt->rt_gw_family = rt->rt_gw_family;
- if (rt->rt_gw_family == AF_INET)
- new_rt->rt_gw4 = rt->rt_gw4;
- else if (rt->rt_gw_family == AF_INET6)
- new_rt->rt_gw6 = rt->rt_gw6;
-
- new_rt->dst.input = rt->dst.input;
- new_rt->dst.output = rt->dst.output;
- new_rt->dst.error = rt->dst.error;
new_rt->dst.lastuse = jiffies;
new_rt->dst.lwtstate = lwtstate_get(rt->dst.lwtstate);
}
--
2.43.0

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