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https://github.com/AsahiLinux/u-boot
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149 lines
4.5 KiB
C
149 lines
4.5 KiB
C
/**
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* @file IxEthDBLearning.c
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*
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* @par
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* IXP400 SW Release version 2.0
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*
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* -- Copyright Notice --
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*
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* @par
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* Copyright 2001-2005, Intel Corporation.
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* All rights reserved.
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*
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* @par
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* @par
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @par
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* -- End of Copyright Notice --
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*/
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#include "IxEthDB_p.h"
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/**
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* @brief hashes the mac address in a mac descriptor with a XOR function
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*
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* @param entry pointer to a mac descriptor to be hashed
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*
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* This function only extracts the mac address and employs ixEthDBKeyXORHash()
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* to do the actual hashing.
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* Used only to add a whole entry to a hash table, as opposed to searching which
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* takes only a key and uses the key hashing directly.
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*
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* @see ixEthDBKeyXORHash()
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*
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* @return the hash value
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*
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* @internal
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*/
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UINT32 ixEthDBEntryXORHash(void *entry)
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{
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MacDescriptor *descriptor = (MacDescriptor *) entry;
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return ixEthDBKeyXORHash(descriptor->macAddress);
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}
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/**
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* @brief hashes a mac address
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*
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* @param key pointer to a 6 byte structure (typically an IxEthDBMacAddr pointer)
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* to be hashed
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*
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* Given a 6 bytes MAC address, the hash used is:
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*
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* hash(MAC[0:5]) = MAC[0:1] ^ MAC[2:3] ^ MAC[4:5]
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*
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* Used by the hash table to search and remove entries based
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* solely on their keys (mac addresses).
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*
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* @return the hash value
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*
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* @internal
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*/
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UINT32 ixEthDBKeyXORHash(void *key)
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{
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UINT32 hashValue;
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UINT8 *value = (UINT8 *) key;
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hashValue = (value[5] << 8) | value[4];
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hashValue ^= (value[3] << 8) | value[2];
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hashValue ^= (value[1] << 8) | value[0];
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return hashValue;
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}
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/**
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* @brief mac descriptor match function
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*
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* @param reference mac address (typically an IxEthDBMacAddr pointer) structure
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* @param entry pointer to a mac descriptor whose key (mac address) is to be
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* matched against the reference key
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*
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* Used by the hash table to retrieve entries. Hashing entries can produce
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* collisions, i.e. descriptors with different mac addresses and the same
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* hash value, where this function is used to differentiate entries.
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*
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* @retval TRUE if the entry matches the reference key (equal addresses)
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* @retval FALSE if the entry does not match the reference key
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*
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* @internal
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*/
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BOOL ixEthDBAddressMatch(void *reference, void *entry)
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{
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return (ixEthDBAddressCompare(reference, ((MacDescriptor *) entry)->macAddress) == 0);
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}
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/**
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* @brief compares two mac addresses
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*
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* @param mac1 first mac address to compare
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* @param mac2 second mac address to compare
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*
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* This comparison works in a similar way to strcmp, producing similar results.
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* Used to insert values keyed on mac addresses into binary search trees.
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*
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* @retval -1 if mac1 < mac2
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* @retval 0 if ma1 == mac2
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* @retval 1 if mac1 > mac2
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*/
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UINT32 ixEthDBAddressCompare(UINT8 *mac1, UINT8 *mac2)
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{
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UINT32 local_index;
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for (local_index = 0 ; local_index < IX_IEEE803_MAC_ADDRESS_SIZE ; local_index++)
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{
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if (mac1[local_index] > mac2[local_index])
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{
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return 1;
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}
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else if (mac1[local_index] < mac2[local_index])
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{
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return -1;
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}
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}
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return 0;
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}
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