X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fmac-learning.c;h=c8582f3123c98d577596d9dcc47a4e54635e648b;hb=refs%2Fheads%2Flts-1.0a;hp=eeebce86629b32b3e66b0481866cdc8bf29a0b61;hpb=34e63086edddcae06d7c1a4fa84fec0861e50758;p=sliver-openvswitch.git

diff --git a/lib/mac-learning.c b/lib/mac-learning.c
index eeebce866..c8582f312 100644
--- a/lib/mac-learning.c
+++ b/lib/mac-learning.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,6 +21,7 @@
 #include <inttypes.h>
 #include <stdlib.h>
 
+#include "bitmap.h"
 #include "coverage.h"
 #include "hash.h"
 #include "list.h"
@@ -28,10 +29,18 @@
 #include "tag.h"
 #include "timeval.h"
 #include "util.h"
-
-#define THIS_MODULE VLM_mac_learning
 #include "vlog.h"
 
+VLOG_DEFINE_THIS_MODULE(mac_learning)
+
+/* 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)
 {
@@ -121,6 +130,7 @@ mac_learning_create(void)
         list_push_front(&ml->free, &s->lru_node);
     }
     ml->secret = random_uint32();
+    ml->flood_vlans = NULL;
     return ml;
 }
 
@@ -128,9 +138,35 @@ mac_learning_create(void)
 void
 mac_learning_destroy(struct mac_learning *ml)
 {
+    if (ml) {
+        bitmap_free(ml->flood_vlans);
+    }
     free(ml);
 }
 
+/* Provides a bitmap of VLANs which have learning disabled, that is, VLANs on
+ * which all packets are flooded.  It takes ownership of the bitmap.  Returns
+ * true if the set has changed from the previous value. */
+bool
+mac_learning_set_flood_vlans(struct mac_learning *ml, unsigned long *bitmap)
+{
+    bool ret = (bitmap == NULL
+                ? ml->flood_vlans != NULL
+                : (ml->flood_vlans == NULL
+                   || !bitmap_equal(bitmap, ml->flood_vlans, 4096)));
+
+    bitmap_free(ml->flood_vlans);
+    ml->flood_vlans = bitmap;
+
+    return ret;
+}
+
+static bool
+is_learning_vlan(const struct mac_learning *ml, uint16_t vlan)
+{
+    return !(ml->flood_vlans && bitmap_is_set(ml->flood_vlans, vlan));
+}
+
 /* Attempts to make 'ml' learn from the fact that a frame from 'src_mac' was
  * just observed arriving from 'src_port' on the given 'vlan'.
  *
@@ -139,15 +175,22 @@ mac_learning_destroy(struct mac_learning *ml)
  * that now need revalidation.
  *
  * The 'vlan' parameter is used to maintain separate per-VLAN learning tables.
- * Specify 0 if this behavior is undesirable. */
+ * Specify 0 if this behavior is undesirable.
+ *
+ * 'lock_type' specifies whether the entry should be locked or existing locks
+ * are check. */
 tag_type
 mac_learning_learn(struct mac_learning *ml,
                    const uint8_t src_mac[ETH_ADDR_LEN], uint16_t vlan,
-                   uint16_t src_port)
+                   uint16_t src_port, enum grat_arp_lock_type lock_type)
 {
     struct mac_entry *e;
     struct list *bucket;
 
+    if (!is_learning_vlan(ml, vlan)) {
+        return 0;
+    }
+
     if (eth_addr_is_multicast(src_mac)) {
         static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(30, 30);
         VLOG_DBG_RL(&rl, "multicast packet source "ETH_ADDR_FMT,
@@ -169,32 +212,42 @@ mac_learning_learn(struct mac_learning *ml,
         e->port = -1;
         e->vlan = vlan;
         e->tag = make_unknown_mac_tag(ml, src_mac, vlan);
+        e->grat_arp_lock = TIME_MIN;
     }
 
-    /* Make the entry most-recently-used. */
-    list_remove(&e->lru_node);
-    list_push_back(&ml->lrus, &e->lru_node);
-    e->expires = time_now() + 60;
-
-    /* Did we learn something? */
-    if (e->port != src_port) {
-        tag_type old_tag = e->tag;
-        e->port = src_port;
-        e->tag = tag_create_random();
-        COVERAGE_INC(mac_learning_learned);
-        return old_tag;
+    if (lock_type != GRAT_ARP_LOCK_CHECK || time_now() >= e->grat_arp_lock) {
+        /* Make the entry most-recently-used. */
+        list_remove(&e->lru_node);
+        list_push_back(&ml->lrus, &e->lru_node);
+        e->expires = time_now() + MAC_ENTRY_IDLE_TIME;
+        if (lock_type == GRAT_ARP_LOCK_SET) {
+            e->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
+        }
+
+        /* Did we learn something? */
+        if (e->port != src_port) {
+            tag_type old_tag = e->tag;
+            e->port = src_port;
+            e->tag = tag_create_random();
+            COVERAGE_INC(mac_learning_learned);
+            return old_tag;
+        }
     }
+
     return 0;
 }
 
 /* Looks up MAC 'dst' for VLAN 'vlan' in 'ml'.  Returns the port on which a
- * frame destined for 'dst' should be sent, -1 if unknown. */
+ * frame destined for 'dst' should be sent, -1 if unknown. 'is_grat_arp_locked'
+ * is an optional parameter that returns whether the entry is currently
+ * locked. */
 int
 mac_learning_lookup(const struct mac_learning *ml,
-                    const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan)
+                    const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan,
+                    bool *is_grat_arp_locked)
 {
     tag_type tag = 0;
-    return mac_learning_lookup_tag(ml, dst, vlan, &tag);
+    return mac_learning_lookup_tag(ml, dst, vlan, &tag, is_grat_arp_locked);
 }
 
 /* Looks up MAC 'dst' for VLAN 'vlan' in 'ml'.  Returns the port on which a
@@ -202,19 +255,27 @@ mac_learning_lookup(const struct mac_learning *ml,
  *
  * Adds to '*tag' (which the caller must have initialized) the tag that should
  * be attached to any flow created based on the return value, if any, to allow
- * those flows to be revalidated when the MAC learning entry changes. */
+ * those flows to be revalidated when the MAC learning entry changes.
+ *
+ * 'is_grat_arp_locked' is an optional parameter that returns whether the entry
+ * is currently locked.*/
 int
 mac_learning_lookup_tag(const struct mac_learning *ml,
                         const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan,
-                        tag_type *tag)
+                        tag_type *tag, bool *is_grat_arp_locked)
 {
-    if (eth_addr_is_multicast(dst)) {
+    if (eth_addr_is_multicast(dst) || !is_learning_vlan(ml, vlan)) {
         return -1;
     } else {
         struct mac_entry *e = search_bucket(mac_table_bucket(ml, dst, vlan),
                                             dst, vlan);
         if (e) {
             *tag |= e->tag;
+
+            if (is_grat_arp_locked) {
+                *is_grat_arp_locked = time_now() < e->grat_arp_lock;
+            }
+
             return e->port;
         } else {
             *tag |= make_unknown_mac_tag(ml, dst, vlan);
@@ -253,6 +314,6 @@ mac_learning_wait(struct mac_learning *ml)
 {
     if (!list_is_empty(&ml->lrus)) {
         struct mac_entry *e = mac_entry_from_lru_node(ml->lrus.next);
-        poll_timer_wait((e->expires - time_now()) * 1000);
+        poll_timer_wait_until(e->expires * 1000LL);
     }
 }