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https://github.com/openvswitch/ovs
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d004060472
Most callers of mac_learning_flush() need to revalidate all flows anyway, but this update forces new callers of mac_learning_flush() to think about whether or not they need to explicitly handle revalidation. Also, it's theoretically more efficient when there are lots of flows but the learning table is empty, (e.g. bridges that don't use the NORMAL action). Signed-off-by: Ethan Jackson <ethan@nicira.com>
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MAC_LEARNING_H
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#define MAC_LEARNING_H 1
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#include <time.h>
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#include "hmap.h"
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#include "list.h"
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#include "packets.h"
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#include "tag.h"
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#include "timeval.h"
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#define MAC_MAX 2048
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/* Time, in seconds, before expiring a mac_entry due to inactivity. */
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#define MAC_ENTRY_IDLE_TIME 60
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/* Time, in seconds, to lock an entry updated by a gratuitous ARP to avoid
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* relearning based on a reflection from a bond slave. */
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#define MAC_GRAT_ARP_LOCK_TIME 5
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/* A MAC learning table entry. */
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struct mac_entry {
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struct hmap_node hmap_node; /* Node in a mac_learning hmap. */
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struct list lru_node; /* Element in 'lrus' list. */
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time_t expires; /* Expiration time. */
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time_t grat_arp_lock; /* Gratuitous ARP lock expiration time. */
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uint8_t mac[ETH_ADDR_LEN]; /* Known MAC address. */
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uint16_t vlan; /* VLAN tag. */
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tag_type tag; /* Tag for this learning entry. */
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/* Learned port. */
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union {
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void *p;
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int i;
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} port;
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};
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int mac_entry_age(const struct mac_entry *);
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/* Returns true if mac_learning_insert() just created 'mac' and the caller has
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* not yet properly initialized it. */
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static inline bool mac_entry_is_new(const struct mac_entry *mac)
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{
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return !mac->tag;
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}
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/* Sets a gratuitous ARP lock on 'mac' that will expire in
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* MAC_GRAT_ARP_LOCK_TIME seconds. */
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static inline void mac_entry_set_grat_arp_lock(struct mac_entry *mac)
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{
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mac->grat_arp_lock = time_now() + MAC_GRAT_ARP_LOCK_TIME;
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}
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/* Returns true if a gratuitous ARP lock is in effect on 'mac', false if none
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* has ever been asserted or if it has expired. */
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static inline bool mac_entry_is_grat_arp_locked(const struct mac_entry *mac)
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{
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return time_now() < mac->grat_arp_lock;
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}
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/* MAC learning table. */
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struct mac_learning {
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struct hmap table; /* Learning table. */
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struct list lrus; /* In-use entries, least recently used at the
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front, most recently used at the back. */
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uint32_t secret; /* Secret for randomizing hash table. */
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unsigned long *flood_vlans; /* Bitmap of learning disabled VLANs. */
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};
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/* Basics. */
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struct mac_learning *mac_learning_create(void);
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void mac_learning_destroy(struct mac_learning *);
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void mac_learning_run(struct mac_learning *, struct tag_set *);
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void mac_learning_wait(struct mac_learning *);
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/* Configuration. */
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bool mac_learning_set_flood_vlans(struct mac_learning *,
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const unsigned long *bitmap);
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/* Learning. */
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bool mac_learning_may_learn(const struct mac_learning *,
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const uint8_t src_mac[ETH_ADDR_LEN],
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uint16_t vlan);
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struct mac_entry *mac_learning_insert(struct mac_learning *,
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const uint8_t src[ETH_ADDR_LEN],
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uint16_t vlan);
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tag_type mac_learning_changed(struct mac_learning *, struct mac_entry *);
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/* Lookup. */
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struct mac_entry *mac_learning_lookup(const struct mac_learning *,
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const uint8_t dst[ETH_ADDR_LEN],
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uint16_t vlan, tag_type *);
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/* Flushing. */
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void mac_learning_expire(struct mac_learning *, struct mac_entry *);
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void mac_learning_flush(struct mac_learning *, struct tag_set *);
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#endif /* mac-learning.h */
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