hash: Implement hash function for Boolean values.

[openvswitch] / lib / mac-learning.c

diff --git a/lib/mac-learning.c b/lib/mac-learning.c
index f03668082c8508d2bdf321b4485546a95e80ecd7..c9b7d3e73d65c65cab5c33fbf1334f2fcaf8a292 100644 (file)
--- a/lib/mac-learning.c
+++ b/lib/mac-learning.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>
@@ -32,32 +32,13 @@
 #define THIS_MODULE VLM_mac_learning
 #include "vlog.h"
 
-#define MAC_HASH_BITS 10
-#define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
-#define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
-
-#define MAC_MAX 1024
-
-/* A MAC learning table entry. */
-struct mac_entry {
-    struct list hash_node;      /* Element in a mac_learning 'table' list. */
-    struct list lru_node;       /* Element in 'lrus' or 'free' list. */
-    time_t expires;             /* Expiration time. */
-    uint8_t mac[ETH_ADDR_LEN];  /* Known MAC address. */
-    uint16_t vlan;              /* VLAN tag. */
-    int port;                   /* Port on which MAC was most recently seen. */
-    tag_type tag;               /* Tag for this learning entry. */
-};
-
-/* MAC learning table. */
-struct mac_learning {
-    struct list free;           /* Not-in-use entries. */
-    struct list lrus;           /* In-use entries, least recently used at the
-                                   front, most recently used at the back. */
-    struct list table[MAC_HASH_SIZE]; /* Hash table. */
-    struct mac_entry entries[MAC_MAX]; /* All entries. */
-    uint32_t secret;            /* Secret for  */
-};
+/* Returns the number of seconds since 'e' was last learned. */
+int
+mac_entry_age(const struct mac_entry *e)
+{
+    time_t remaining = e->expires - time_now();
+    return MAC_ENTRY_IDLE_TIME - remaining;
+}
 
 static uint32_t
 mac_table_hash(const uint8_t mac[ETH_ADDR_LEN], uint16_t vlan)
@@ -201,7 +182,7 @@ mac_learning_learn(struct mac_learning *ml,
     /* Make the entry most-recently-used. */
     list_remove(&e->lru_node);
     list_push_back(&ml->lrus, &e->lru_node);
-    e->expires = time_now() + 60;
+    e->expires = time_now() + MAC_ENTRY_IDLE_TIME;
 
     /* Did we learn something? */
     if (e->port != src_port) {