From: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
To: davem@davemloft.net, netdev@vger.kernel.org
Cc: yoshfuji@linux-ipv6.org
Subject: [PATCH 6/6] ipv6: 64bit version of ipv6_prefix_equal().
Date: Tue, 15 Jan 2013 02:10:38 +0900 [thread overview]
Message-ID: <50F43C0E.8060003@linux-ipv6.org> (raw)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
---
include/net/ipv6.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index fe95053..3d32a8e 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -399,6 +399,31 @@ static inline bool ipv6_addr_equal(const struct in6_addr *a1,
#endif
}
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
+static inline bool __ipv6_prefix_equal64_half(const __be64 *a1,
+ const __be64 *a2,
+ unsigned int len)
+{
+ if (len && ((*a1 ^ *a2) & cpu_to_be64(~0UL) << (64 - len)))
+ return false;
+ return true;
+}
+
+static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
+ const struct in6_addr *addr2,
+ unsigned int prefixlen)
+{
+ const __be64 *a1 = (const __be64 *)addr1;
+ const __be64 *a2 = (const __be64 *)addr2;
+
+ if (prefixlen >= 64) {
+ if (a1[0] ^ a2[0])
+ return false;
+ return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);
+ }
+ return __ipv6_prefix_equal64_half(a1, a2, prefixlen);
+}
+#else
static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
const struct in6_addr *addr2,
unsigned int prefixlen)
@@ -419,6 +444,7 @@ static inline bool ipv6_prefix_equal(const struct in6_addr *addr1,
return true;
}
+#endif
struct inet_frag_queue;
--
1.7.9.5
reply other threads:[~2013-01-14 17:10 UTC|newest]
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