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gre: optimize hash lookup 

Instead of keeping candidate tunnel device from all categories,
keep only one candidate with best score. This optimizes stack
usage and speeds up exit code.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timo Teras 2009-01-26 20:56:10 -08:00 коммит произвёл David S. Miller
Родитель 3eacdf58c2
Коммит afcf12422e
1 изменённых файлов: 40 добавлений и 29 удалений
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69
net/ipv4/ip_gre.c
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@ -172,11 +172,11 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
int link = dev->ifindex;
unsigned h0 = HASH(remote);
unsigned h1 = HASH(key);
struct ip_tunnel *t, *sel[4] = { NULL, NULL, NULL, NULL };
struct ip_tunnel *t, *cand = NULL;
struct ipgre_net *ign = net_generic(net, ipgre_net_id);
int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
ARPHRD_ETHER : ARPHRD_IPGRE;
int idx;
int score, cand_score = 4;
for (t = ign->tunnels_r_l[h0^h1]; t; t = t->next) {
if (local != t->parms.iph.saddr ||
@ -189,15 +189,18 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
t->dev->type != dev_type)
continue;
idx = 0;
score = 0;
if (t->parms.link != link)
idx |= 1;
score |= 1;
if (t->dev->type != dev_type)
idx |= 2;
if (idx == 0)
score |= 2;
if (score == 0)
return t;
if (sel[idx] == NULL)
sel[idx] = t;
if (score < cand_score) {
cand = t;
cand_score = score;
}
}
for (t = ign->tunnels_r[h0^h1]; t; t = t->next) {
@ -210,15 +213,18 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
t->dev->type != dev_type)
continue;
idx = 0;
score = 0;
if (t->parms.link != link)
idx |= 1;
score |= 1;
if (t->dev->type != dev_type)
idx |= 2;
if (idx == 0)
score |= 2;
if (score == 0)
return t;
if (sel[idx] == NULL)
sel[idx] = t;
if (score < cand_score) {
cand = t;
cand_score = score;
}
}
for (t = ign->tunnels_l[h1]; t; t = t->next) {
@ -233,15 +239,18 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
t->dev->type != dev_type)
continue;
idx = 0;
score = 0;
if (t->parms.link != link)
idx |= 1;
score |= 1;
if (t->dev->type != dev_type)
idx |= 2;
if (idx == 0)
score |= 2;
if (score == 0)
return t;
if (sel[idx] == NULL)
sel[idx] = t;
if (score < cand_score) {
cand = t;
cand_score = score;
}
}
for (t = ign->tunnels_wc[h1]; t; t = t->next) {
@ -253,20 +262,22 @@ static struct ip_tunnel * ipgre_tunnel_lookup(struct net_device *dev,
t->dev->type != dev_type)
continue;
idx = 0;
score = 0;
if (t->parms.link != link)
idx |= 1;
score |= 1;
if (t->dev->type != dev_type)
idx |= 2;
if (idx == 0)
score |= 2;
if (score == 0)
return t;
if (sel[idx] == NULL)
sel[idx] = t;
if (score < cand_score) {
cand = t;
cand_score = score;
}
}
for (idx = 1; idx < ARRAY_SIZE(sel); idx++)
if (sel[idx] != NULL)
return sel[idx];
if (cand != NULL)
return cand;
if (ign->fb_tunnel_dev->flags & IFF_UP)
return netdev_priv(ign->fb_tunnel_dev);