From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
To: davem@davemloft.net, netdev@vger.kernel.org
Cc: yoshfuji@linux-ipv6.org
Subject: [PATCH net-next 4/5] ipv6: Optimize ipv6_addr_is_ll_all_{nodes,routers}().
Date: Mon, 21 Jan 2013 02:38:52 +0900 [thread overview]
Message-ID: <50FC2BAC.4070107@linux-ipv6.org> (raw)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
---
include/net/addrconf.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 9dc5efc..6c58d50 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -288,16 +288,26 @@ static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr)
{
+#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(1))) == 0UL;
+#else
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
addr->s6_addr32[1] | addr->s6_addr32[2] |
(addr->s6_addr32[3] ^ htonl(0x00000001))) == 0;
+#endif
}
static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr)
{
+#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(2))) == 0UL;
+#else
return ((addr->s6_addr32[0] ^ htonl(0xff020000)) |
addr->s6_addr32[1] | addr->s6_addr32[2] |
(addr->s6_addr32[3] ^ htonl(0x00000002))) == 0;
+#endif
}
static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr)
--
1.7.9.5
reply other threads:[~2013-01-20 17:38 UTC|newest]
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