mv643xx_eth: massively simplify multicast address crc8 computation
Replace the 70-line crc8 computation (used for multicast address filtering tables) by a 5-line version. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Acked-by: Dale Farnsworth <dale@farnsworth.org>
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1682005477
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1 changed files with 21 additions and 74 deletions
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@ -1141,16 +1141,29 @@ static int mv643xx_eth_set_mac_address(struct net_device *dev, void *addr)
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return 0;
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}
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static int addr_crc(unsigned char *addr)
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{
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int crc = 0;
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int i;
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for (i = 0; i < 6; i++) {
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int j;
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crc = (crc ^ addr[i]) << 8;
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for (j = 7; j >= 0; j--) {
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if (crc & (0x100 << j))
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crc ^= 0x107 << j;
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}
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}
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return crc;
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}
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static void mc_addr(struct mv643xx_eth_private *mp, unsigned char *addr)
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{
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unsigned int port_num = mp->port_num;
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unsigned int mac_h;
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unsigned int mac_l;
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unsigned char crc_result = 0;
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int table;
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int mac_array[48];
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int crc[8];
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int i;
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int crc;
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if ((addr[0] == 0x01) && (addr[1] == 0x00) &&
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(addr[2] == 0x5E) && (addr[3] == 0x00) && (addr[4] == 0x00)) {
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@ -1159,76 +1172,10 @@ static void mc_addr(struct mv643xx_eth_private *mp, unsigned char *addr)
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return;
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}
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/* Calculate CRC-8 out of the given address */
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mac_h = (addr[0] << 8) | (addr[1]);
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mac_l = (addr[2] << 24) | (addr[3] << 16) |
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(addr[4] << 8) | (addr[5] << 0);
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for (i = 0; i < 32; i++)
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mac_array[i] = (mac_l >> i) & 0x1;
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for (i = 32; i < 48; i++)
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mac_array[i] = (mac_h >> (i - 32)) & 0x1;
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crc[0] = mac_array[45] ^ mac_array[43] ^ mac_array[40] ^ mac_array[39] ^
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mac_array[35] ^ mac_array[34] ^ mac_array[31] ^ mac_array[30] ^
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mac_array[28] ^ mac_array[23] ^ mac_array[21] ^ mac_array[19] ^
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mac_array[18] ^ mac_array[16] ^ mac_array[14] ^ mac_array[12] ^
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mac_array[8] ^ mac_array[7] ^ mac_array[6] ^ mac_array[0];
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crc[1] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^
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mac_array[41] ^ mac_array[39] ^ mac_array[36] ^ mac_array[34] ^
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mac_array[32] ^ mac_array[30] ^ mac_array[29] ^ mac_array[28] ^
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mac_array[24] ^ mac_array[23] ^ mac_array[22] ^ mac_array[21] ^
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mac_array[20] ^ mac_array[18] ^ mac_array[17] ^ mac_array[16] ^
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mac_array[15] ^ mac_array[14] ^ mac_array[13] ^ mac_array[12] ^
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mac_array[9] ^ mac_array[6] ^ mac_array[1] ^ mac_array[0];
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crc[2] = mac_array[47] ^ mac_array[46] ^ mac_array[44] ^ mac_array[43] ^
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mac_array[42] ^ mac_array[39] ^ mac_array[37] ^ mac_array[34] ^
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mac_array[33] ^ mac_array[29] ^ mac_array[28] ^ mac_array[25] ^
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mac_array[24] ^ mac_array[22] ^ mac_array[17] ^ mac_array[15] ^
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mac_array[13] ^ mac_array[12] ^ mac_array[10] ^ mac_array[8] ^
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mac_array[6] ^ mac_array[2] ^ mac_array[1] ^ mac_array[0];
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crc[3] = mac_array[47] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^
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mac_array[40] ^ mac_array[38] ^ mac_array[35] ^ mac_array[34] ^
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mac_array[30] ^ mac_array[29] ^ mac_array[26] ^ mac_array[25] ^
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mac_array[23] ^ mac_array[18] ^ mac_array[16] ^ mac_array[14] ^
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mac_array[13] ^ mac_array[11] ^ mac_array[9] ^ mac_array[7] ^
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mac_array[3] ^ mac_array[2] ^ mac_array[1];
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crc[4] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[41] ^
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mac_array[39] ^ mac_array[36] ^ mac_array[35] ^ mac_array[31] ^
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mac_array[30] ^ mac_array[27] ^ mac_array[26] ^ mac_array[24] ^
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mac_array[19] ^ mac_array[17] ^ mac_array[15] ^ mac_array[14] ^
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mac_array[12] ^ mac_array[10] ^ mac_array[8] ^ mac_array[4] ^
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mac_array[3] ^ mac_array[2];
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crc[5] = mac_array[47] ^ mac_array[46] ^ mac_array[45] ^ mac_array[42] ^
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mac_array[40] ^ mac_array[37] ^ mac_array[36] ^ mac_array[32] ^
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mac_array[31] ^ mac_array[28] ^ mac_array[27] ^ mac_array[25] ^
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mac_array[20] ^ mac_array[18] ^ mac_array[16] ^ mac_array[15] ^
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mac_array[13] ^ mac_array[11] ^ mac_array[9] ^ mac_array[5] ^
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mac_array[4] ^ mac_array[3];
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crc[6] = mac_array[47] ^ mac_array[46] ^ mac_array[43] ^ mac_array[41] ^
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mac_array[38] ^ mac_array[37] ^ mac_array[33] ^ mac_array[32] ^
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mac_array[29] ^ mac_array[28] ^ mac_array[26] ^ mac_array[21] ^
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mac_array[19] ^ mac_array[17] ^ mac_array[16] ^ mac_array[14] ^
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mac_array[12] ^ mac_array[10] ^ mac_array[6] ^ mac_array[5] ^
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mac_array[4];
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crc[7] = mac_array[47] ^ mac_array[44] ^ mac_array[42] ^ mac_array[39] ^
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mac_array[38] ^ mac_array[34] ^ mac_array[33] ^ mac_array[30] ^
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mac_array[29] ^ mac_array[27] ^ mac_array[22] ^ mac_array[20] ^
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mac_array[18] ^ mac_array[17] ^ mac_array[15] ^ mac_array[13] ^
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mac_array[11] ^ mac_array[7] ^ mac_array[6] ^ mac_array[5];
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for (i = 0; i < 8; i++)
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crc_result = crc_result | (crc[i] << i);
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crc = addr_crc(addr);
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table = OTHER_MCAST_TABLE(port_num);
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set_filter_table_entry(mp, table, crc_result);
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set_filter_table_entry(mp, table, crc);
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}
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static void set_multicast_list(struct net_device *dev)
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