From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
To: davem@davemloft.net, netdev@vger.kernel.org
Cc: yoshfuji@linux-ipv6.org
Subject: [PATCH net-next 3/5] ipv6: Optimize ipv6_addr_is_solict_mult().
Date: Mon, 21 Jan 2013 02:39:07 +0900 [thread overview]
Message-ID: <50FC2BBB.6040404@linux-ipv6.org> (raw)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
---
include/net/addrconf.h | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 3a3eeb4..9dc5efc 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -307,10 +307,17 @@ static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr)
{
- return (addr->s6_addr32[0] == htonl(0xff020000) &&
- addr->s6_addr32[1] == htonl(0x00000000) &&
- addr->s6_addr32[2] == htonl(0x00000001) &&
- addr->s6_addr[12] == 0xff);
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+ __u64 *p = (__u64 *)addr;
+ return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) |
+ ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) &
+ cpu_to_be64(0xffffffffff000000UL))) == 0UL;
+#else
+ return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
+ addr->s6_addr32[1] |
+ (addr->s6_addr32[2] ^ htonl(0x00000001)) |
+ (addr->s6_addr[12] ^ 0xff)) == 0;
+#endif
}
#ifdef CONFIG_PROC_FS
--
1.7.9.5
reply other threads:[~2013-01-20 17:39 UTC|newest]
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