X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fmac-learning.h;h=8f8fd45875624d5a9891f0a98fd356f872fde3e0;hb=c2725b60074755713b2fdd73559b6d24d5eb7970;hp=c4a0e28b5b316a22f2a93294fefbdd0c8a5736de;hpb=a0bc29a541fc7dc6e20137d5558e2094d614e6ab;p=openvswitch

diff --git a/lib/mac-learning.h b/lib/mac-learning.h
index c4a0e28b..8f8fd458 100644
--- a/lib/mac-learning.h
+++ b/lib/mac-learning.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,57 +18,101 @@
 #define MAC_LEARNING_H 1
 
 #include <time.h>
+#include "hmap.h"
 #include "list.h"
 #include "packets.h"
 #include "tag.h"
+#include "timeval.h"
 
-#define MAC_HASH_BITS 10
-#define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
-#define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
+struct mac_learning;
 
 #define MAC_MAX 2048
 
 /* Time, in seconds, before expiring a mac_entry due to inactivity. */
-#define MAC_ENTRY_IDLE_TIME 60
+#define MAC_ENTRY_DEFAULT_IDLE_TIME 300
+
+/* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
+ * relearning based on a reflection from a bond slave. */
+#define MAC_GRAT_ARP_LOCK_TIME 5
 
 /* 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. */
+    struct hmap_node hmap_node; /* Node in a mac_learning hmap. */
+    struct list lru_node;       /* Element in 'lrus' list. */
     time_t expires;             /* Expiration time. */
+    time_t grat_arp_lock;       /* Gratuitous ARP lock 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. */
+
+    /* Learned port. */
+    union {
+        void *p;
+        int i;
+    } port;
 };
 
-int mac_entry_age(const struct mac_entry *);
+int mac_entry_age(const struct mac_learning *, const struct mac_entry *);
+
+/* Returns true if mac_learning_insert() just created 'mac' and the caller has
+ * not yet properly initialized it. */
+static inline bool mac_entry_is_new(const struct mac_entry *mac)
+{
+    return !mac->tag;
+}
+
+/* Sets a gratuitous ARP lock on 'mac' that will expire in
+ * MAC_GRAT_ARP_LOCK_TIME seconds. */
+static inline void mac_entry_set_grat_arp_lock(struct mac_entry *mac)
+{
+    mac->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
+}
+
+/* Returns true if a gratuitous ARP lock is in effect on 'mac', false if none
+ * has ever been asserted or if it has expired. */
+static inline bool mac_entry_is_grat_arp_locked(const struct mac_entry *mac)
+{
+    return time_now() < mac->grat_arp_lock;
+}
 
 /* MAC learning table. */
 struct mac_learning {
-    struct list free;           /* Not-in-use entries. */
+    struct hmap table;          /* Learning table. */
     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 randomizing hash table. */
     unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
+    unsigned int idle_time;     /* Max age before deleting an entry. */
 };
 
-struct mac_learning *mac_learning_create(void);
+/* Basics. */
+struct mac_learning *mac_learning_create(unsigned int idle_time);
 void mac_learning_destroy(struct mac_learning *);
-bool mac_learning_set_flood_vlans(struct mac_learning *,
-                                  unsigned long *bitmap);
-tag_type mac_learning_learn(struct mac_learning *,
-                            const uint8_t src[ETH_ADDR_LEN], uint16_t vlan,
-                            uint16_t src_port);
-int mac_learning_lookup(const struct mac_learning *,
-                        const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan);
-int mac_learning_lookup_tag(const struct mac_learning *,
-                            const uint8_t dst[ETH_ADDR_LEN],
-                            uint16_t vlan, tag_type *tag);
-void mac_learning_flush(struct mac_learning *);
+
 void mac_learning_run(struct mac_learning *, struct tag_set *);
 void mac_learning_wait(struct mac_learning *);
 
+/* Configuration. */
+bool mac_learning_set_flood_vlans(struct mac_learning *,
+                                  const unsigned long *bitmap);
+void mac_learning_set_idle_time(struct mac_learning *, unsigned int idle_time);
+
+/* Learning. */
+bool mac_learning_may_learn(const struct mac_learning *,
+                            const uint8_t src_mac[ETH_ADDR_LEN],
+                            uint16_t vlan);
+struct mac_entry *mac_learning_insert(struct mac_learning *,
+                                      const uint8_t src[ETH_ADDR_LEN],
+                                      uint16_t vlan);
+tag_type mac_learning_changed(struct mac_learning *, struct mac_entry *);
+
+/* Lookup. */
+struct mac_entry *mac_learning_lookup(const struct mac_learning *,
+                                      const uint8_t dst[ETH_ADDR_LEN],
+                                      uint16_t vlan, tag_type *);
+
+/* Flushing. */
+void mac_learning_expire(struct mac_learning *, struct mac_entry *);
+void mac_learning_flush(struct mac_learning *, struct tag_set *);
+
 #endif /* mac-learning.h */