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authorEric Dumazet <dada1@cosmosbay.com>2009-02-20 11:03:33 +0100
committerPatrick McHardy <kaber@trash.net>2009-02-20 11:03:33 +0100
commit08361aa807ae5e5007cd226ca9e34287512de737 (patch)
tree2b0a51af98e4df407f7bce90ca8cd1a065691b1c
parent268cb38e1802db560c73167e643f14a3dcb4b07c (diff)
downloadop-kernel-dev-08361aa807ae5e5007cd226ca9e34287512de737.zip
op-kernel-dev-08361aa807ae5e5007cd226ca9e34287512de737.tar.gz
netfilter: ip_tables: unfold two critical loops in ip_packet_match()
While doing oprofile tests I noticed two loops are not properly unrolled by gcc Using a hand coded unrolled loop provides nice speedup : ipt_do_table credited of 2.52 % of cpu instead of 3.29 % in tbench. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
-rw-r--r--net/ipv4/netfilter/ip_tables.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 08cde5b..e5294ae 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -74,6 +74,25 @@ do { \
Hence the start of any table is given by get_table() below. */
+static unsigned long ifname_compare(const char *_a, const char *_b,
+ const unsigned char *_mask)
+{
+ const unsigned long *a = (const unsigned long *)_a;
+ const unsigned long *b = (const unsigned long *)_b;
+ const unsigned long *mask = (const unsigned long *)_mask;
+ unsigned long ret;
+
+ ret = (a[0] ^ b[0]) & mask[0];
+ if (IFNAMSIZ > sizeof(unsigned long))
+ ret |= (a[1] ^ b[1]) & mask[1];
+ if (IFNAMSIZ > 2 * sizeof(unsigned long))
+ ret |= (a[2] ^ b[2]) & mask[2];
+ if (IFNAMSIZ > 3 * sizeof(unsigned long))
+ ret |= (a[3] ^ b[3]) & mask[3];
+ BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
+ return ret;
+}
+
/* Returns whether matches rule or not. */
/* Performance critical - called for every packet */
static inline bool
@@ -83,7 +102,6 @@ ip_packet_match(const struct iphdr *ip,
const struct ipt_ip *ipinfo,
int isfrag)
{
- size_t i;
unsigned long ret;
#define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
@@ -103,12 +121,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- /* Look for ifname matches; this should unroll nicely. */
- for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
- ret |= (((const unsigned long *)indev)[i]
- ^ ((const unsigned long *)ipinfo->iniface)[i])
- & ((const unsigned long *)ipinfo->iniface_mask)[i];
- }
+ ret = ifname_compare(indev, ipinfo->iniface, ipinfo->iniface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
@@ -117,11 +130,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- for (i = 0, ret = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
- ret |= (((const unsigned long *)outdev)[i]
- ^ ((const unsigned long *)ipinfo->outiface)[i])
- & ((const unsigned long *)ipinfo->outiface_mask)[i];
- }
+ ret = ifname_compare(outdev, ipinfo->outiface, ipinfo->outiface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
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