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30a2c8b162
Given a possible 1,024 ports on a bridge the previous limit of 2,048 entries seems low. If we want to increase this further we should introduce dynamic allocation of table entries to avoid wasting memory in the common case. CC: Keith Amidon <keith@nicira.com>
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*
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* Copyright (c) 2008, 2009 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 "list.h"
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#include "packets.h"
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#include "tag.h"
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#define MAC_HASH_BITS 10
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#define MAC_HASH_MASK (MAC_HASH_SIZE - 1)
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#define MAC_HASH_SIZE (1u << MAC_HASH_BITS)
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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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/* A MAC learning table entry. */
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struct mac_entry {
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struct list hash_node; /* Element in a mac_learning 'table' list. */
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struct list lru_node; /* Element in 'lrus' or 'free' list. */
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time_t expires; /* 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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int port; /* Port on which MAC was most recently seen. */
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tag_type tag; /* Tag for this learning entry. */
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};
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int mac_entry_age(const struct mac_entry *);
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/* MAC learning table. */
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struct mac_learning {
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struct list free; /* Not-in-use entries. */
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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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struct list table[MAC_HASH_SIZE]; /* Hash table. */
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struct mac_entry entries[MAC_MAX]; /* All entries. */
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uint32_t secret; /* Secret for */
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};
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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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tag_type mac_learning_learn(struct mac_learning *,
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const uint8_t src[ETH_ADDR_LEN], uint16_t vlan,
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uint16_t src_port);
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int mac_learning_lookup(const struct mac_learning *,
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const uint8_t dst[ETH_ADDR_LEN], uint16_t vlan);
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int mac_learning_lookup_tag(const struct mac_learning *,
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const uint8_t dst[ETH_ADDR_LEN],
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uint16_t vlan, tag_type *tag);
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void mac_learning_flush(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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#endif /* mac-learning.h */
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