Catalli's threaded switch

[sliver-openvswitch.git] / lib / hash.c

diff --git a/lib/hash.c b/lib/hash.c
index af8f21b..63b4784 100644 (file)
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -1,17 +1,17 @@
 /*
  * Copyright (c) 2008, 2009 Nicira Networks.
  *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
  *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 #include <config.h>
 #include "hash.h"
@@ -52,6 +52,21 @@ hash_words(const uint32_t *p, size_t n, uint32_t basis)
     return c;
 }
 
+/* Returns the hash of the pair of aligned 32-bit words at 'p', starting from
+ * 'basis'. */
+uint32_t
+hash_2words(const uint32_t *p, uint32_t basis)
+{
+    uint32_t a, b, c;
+
+    a = b = c = 0xdeadbeef + (2 << 2) + basis;
+    b += p[1];
+    a += p[0];
+    HASH_FINAL(a, b, c);
+
+    return c;
+}
+
 /* Returns the hash of the 'n' bytes at 'p', starting from 'basis'. */
 uint32_t
 hash_bytes(const void *p_, size_t n, uint32_t basis)