From: Dale Farnsworth Date: Mon, 16 Jan 2006 23:50:02 +0000 (-0700) Subject: [PATCH] mv643xx_eth: Add multicast support X-Git-Tag: v2.6.16-rc2~366^2~64 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16e0301831767ee1b8e5e022cc08e76f9f8a8938;p=linux-2.6 [PATCH] mv643xx_eth: Add multicast support This code is adapted from code in a ppc-specific version of the driver. Signed-off-by: Dale Farnsworth mv643xx_eth.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 197 insertions(+), 4 deletions(-) Signed-off-by: Jeff Garzik --- diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c index 88a59d9715..f100ca7d3e 100644 --- a/drivers/net/mv643xx_eth.c +++ b/drivers/net/mv643xx_eth.c @@ -80,6 +80,7 @@ static int eth_port_link_is_up(unsigned int eth_port_num); static void eth_port_uc_addr_get(struct net_device *dev, unsigned char *MacAddr); +static void eth_port_set_multicast_list(struct net_device *); static int mv643xx_eth_real_open(struct net_device *); static int mv643xx_eth_real_stop(struct net_device *); static int mv643xx_eth_change_mtu(struct net_device *, int); @@ -269,6 +270,8 @@ static void mv643xx_eth_set_rx_mode(struct net_device *dev) mp->port_config &= ~(u32) MV643XX_ETH_UNICAST_PROMISCUOUS_MODE; mv_write(MV643XX_ETH_PORT_CONFIG_REG(mp->port_num), mp->port_config); + + eth_port_set_multicast_list(dev); } /* @@ -2044,6 +2047,196 @@ static int eth_port_uc_addr(unsigned int eth_port_num, unsigned char uc_nibble, return 1; } +/* + * The entries in each table are indexed by a hash of a packet's MAC + * address. One bit in each entry determines whether the packet is + * accepted. There are 4 entries (each 8 bits wide) in each register + * of the table. The bits in each entry are defined as follows: + * 0 Accept=1, Drop=0 + * 3-1 Queue (ETH_Q0=0) + * 7-4 Reserved = 0; + */ +static void eth_port_set_filter_table_entry(int table, unsigned char entry) +{ + unsigned int table_reg; + unsigned int tbl_offset; + unsigned int reg_offset; + + tbl_offset = (entry / 4) * 4; /* Register offset of DA table entry */ + reg_offset = entry % 4; /* Entry offset within the register */ + + /* Set "accepts frame bit" at specified table entry */ + table_reg = mv_read(table + tbl_offset); + table_reg |= 0x01 << (8 * reg_offset); + mv_write(table + tbl_offset, table_reg); +} + +/* + * eth_port_mc_addr - Multicast address settings. + * + * The MV device supports multicast using two tables: + * 1) Special Multicast Table for MAC addresses of the form + * 0x01-00-5E-00-00-XX (where XX is between 0x00 and 0x_FF). + * The MAC DA[7:0] bits are used as a pointer to the Special Multicast + * Table entries in the DA-Filter table. + * 2) Other Multicast Table for multicast of another type. A CRC-8bit + * is used as an index to the Other Multicast Table entries in the + * DA-Filter table. This function calculates the CRC-8bit value. + * In either case, eth_port_set_filter_table_entry() is then called + * to set to set the actual table entry. + */ +static void eth_port_mc_addr(unsigned int eth_port_num, unsigned char *p_addr) +{ + unsigned int mac_h; + unsigned int mac_l; + unsigned char crc_result = 0; + int table; + int mac_array[48]; + int crc[8]; + int i; + + if ((p_addr[0] == 0x01) && (p_addr[1] == 0x00) && + (p_addr[2] == 0x5E) && (p_addr[3] == 0x00) && (p_addr[4] == 0x00)) { + table = MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE + (eth_port_num); + eth_port_set_filter_table_entry(table, p_addr[5]); + return; + } + + /* Calculate CRC-8 out of the given address */ + mac_h = (p_addr[0] << 8) | (p_addr[1]); + mac_l = (p_addr[2] << 24) | (p_addr[3] << 16) | + (p_addr[4] << 8) | (p_addr[5] << 0); + + for (i = 0; i < 32; i++) + mac_array[i] = (mac_l >> i) & 0x1; + for (i = 32; i < 48; i++) + mac_array[i] = (mac_h >> (i - 32)) & 0x1; + + crc[0] = mac_array[45] ^ mac_array[43] ^ mac_array[40] ^ mac_array[39] ^ + mac_array[35] ^ mac_array[34] ^ mac_array[31] ^ mac_array[30] ^ + mac_array[28] ^ mac_array[23] ^ mac_array[21] ^ mac_array[19] ^ + mac_array[18] ^ mac_array[16] ^ mac_array[14] ^ mac_array[12] ^ + mac_array[8] ^ mac_array[7] ^ mac_array[6] ^ mac_array[0]; + + crc[1] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^ + mac_array[41] ^ mac_array[39] ^ mac_array[36] ^ mac_array[34] ^ + mac_array[32] ^ mac_array[30] ^ mac_array[29] ^ mac_array[28] ^ + mac_array[24] ^ mac_array[23] ^ mac_array[22] ^ mac_array[21] ^ + mac_array[20] ^ mac_array[18] ^ mac_array[17] ^ mac_array[16] ^ + mac_array[15] ^ mac_array[14] ^ mac_array[13] ^ mac_array[12] ^ + mac_array[9] ^ mac_array[6] ^ mac_array[1] ^ mac_array[0]; + + crc[2] = mac_array[47] ^ mac_array[46] ^ mac_array[44] ^ mac_array[43] ^ + mac_array[42] ^ mac_array[39] ^ mac_array[37] ^ mac_array[34] ^ + mac_array[33] ^ mac_array[29] ^ mac_array[28] ^ mac_array[25] ^ + mac_array[24] ^ mac_array[22] ^ mac_array[17] ^ mac_array[15] ^ + mac_array[13] ^ mac_array[12] ^ mac_array[10] ^ mac_array[8] ^ + mac_array[6] ^ mac_array[2] ^ mac_array[1] ^ mac_array[0]; + + crc[3] = mac_array[47] ^ mac_array[45] ^ mac_array[44] ^ mac_array[43] ^ + mac_array[40] ^ mac_array[38] ^ mac_array[35] ^ mac_array[34] ^ + mac_array[30] ^ mac_array[29] ^ mac_array[26] ^ mac_array[25] ^ + mac_array[23] ^ mac_array[18] ^ mac_array[16] ^ mac_array[14] ^ + mac_array[13] ^ mac_array[11] ^ mac_array[9] ^ mac_array[7] ^ + mac_array[3] ^ mac_array[2] ^ mac_array[1]; + + crc[4] = mac_array[46] ^ mac_array[45] ^ mac_array[44] ^ mac_array[41] ^ + mac_array[39] ^ mac_array[36] ^ mac_array[35] ^ mac_array[31] ^ + mac_array[30] ^ mac_array[27] ^ mac_array[26] ^ mac_array[24] ^ + mac_array[19] ^ mac_array[17] ^ mac_array[15] ^ mac_array[14] ^ + mac_array[12] ^ mac_array[10] ^ mac_array[8] ^ mac_array[4] ^ + mac_array[3] ^ mac_array[2]; + + crc[5] = mac_array[47] ^ mac_array[46] ^ mac_array[45] ^ mac_array[42] ^ + mac_array[40] ^ mac_array[37] ^ mac_array[36] ^ mac_array[32] ^ + mac_array[31] ^ mac_array[28] ^ mac_array[27] ^ mac_array[25] ^ + mac_array[20] ^ mac_array[18] ^ mac_array[16] ^ mac_array[15] ^ + mac_array[13] ^ mac_array[11] ^ mac_array[9] ^ mac_array[5] ^ + mac_array[4] ^ mac_array[3]; + + crc[6] = mac_array[47] ^ mac_array[46] ^ mac_array[43] ^ mac_array[41] ^ + mac_array[38] ^ mac_array[37] ^ mac_array[33] ^ mac_array[32] ^ + mac_array[29] ^ mac_array[28] ^ mac_array[26] ^ mac_array[21] ^ + mac_array[19] ^ mac_array[17] ^ mac_array[16] ^ mac_array[14] ^ + mac_array[12] ^ mac_array[10] ^ mac_array[6] ^ mac_array[5] ^ + mac_array[4]; + + crc[7] = mac_array[47] ^ mac_array[44] ^ mac_array[42] ^ mac_array[39] ^ + mac_array[38] ^ mac_array[34] ^ mac_array[33] ^ mac_array[30] ^ + mac_array[29] ^ mac_array[27] ^ mac_array[22] ^ mac_array[20] ^ + mac_array[18] ^ mac_array[17] ^ mac_array[15] ^ mac_array[13] ^ + mac_array[11] ^ mac_array[7] ^ mac_array[6] ^ mac_array[5]; + + for (i = 0; i < 8; i++) + crc_result = crc_result | (crc[i] << i); + + table = MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE(eth_port_num); + eth_port_set_filter_table_entry(table, crc_result); +} + +/* + * Set the entire multicast list based on dev->mc_list. + */ +static void eth_port_set_multicast_list(struct net_device *dev) +{ + + struct dev_mc_list *mc_list; + int i; + int table_index; + struct mv643xx_private *mp = netdev_priv(dev); + unsigned int eth_port_num = mp->port_num; + + /* If the device is in promiscuous mode or in all multicast mode, + * we will fully populate both multicast tables with accept. + * This is guaranteed to yield a match on all multicast addresses... + */ + if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI)) { + for (table_index = 0; table_index <= 0xFC; table_index += 4) { + /* Set all entries in DA filter special multicast + * table (Ex_dFSMT) + * Set for ETH_Q0 for now + * Bits + * 0 Accept=1, Drop=0 + * 3-1 Queue ETH_Q0=0 + * 7-4 Reserved = 0; + */ + mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE(eth_port_num) + table_index, 0x01010101); + + /* Set all entries in DA filter other multicast + * table (Ex_dFOMT) + * Set for ETH_Q0 for now + * Bits + * 0 Accept=1, Drop=0 + * 3-1 Queue ETH_Q0=0 + * 7-4 Reserved = 0; + */ + mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE(eth_port_num) + table_index, 0x01010101); + } + return; + } + + /* We will clear out multicast tables every time we get the list. + * Then add the entire new list... + */ + for (table_index = 0; table_index <= 0xFC; table_index += 4) { + /* Clear DA filter special multicast table (Ex_dFSMT) */ + mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE + (eth_port_num) + table_index, 0); + + /* Clear DA filter other multicast table (Ex_dFOMT) */ + mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE + (eth_port_num) + table_index, 0); + } + + /* Get pointer to net_device multicast list and add each one... */ + for (i = 0, mc_list = dev->mc_list; + (i < 256) && (mc_list != NULL) && (i < dev->mc_count); + i++, mc_list = mc_list->next) + if (mc_list->dmi_addrlen == 6) + eth_port_mc_addr(eth_port_num, mc_list->dmi_addr); +} + /* * eth_port_init_mac_tables - Clear all entrance in the UC, SMC and OMC tables * @@ -2071,11 +2264,11 @@ static void eth_port_init_mac_tables(unsigned int eth_port_num) for (table_index = 0; table_index <= 0xFC; table_index += 4) { /* Clear DA filter special multicast table (Ex_dFSMT) */ - mv_write((MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE - (eth_port_num) + table_index), 0); + mv_write(MV643XX_ETH_DA_FILTER_SPECIAL_MULTICAST_TABLE_BASE + (eth_port_num) + table_index, 0); /* Clear DA filter other multicast table (Ex_dFOMT) */ - mv_write((MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE - (eth_port_num) + table_index), 0); + mv_write(MV643XX_ETH_DA_FILTER_OTHER_MULTICAST_TABLE_BASE + (eth_port_num) + table_index, 0); } }