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[PATCH] mv643xx_eth: Add multicast support
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This code is adapted from code in a ppc-specific version of the driver.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>

 mv643xx_eth.c |  201 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 197 insertions(+), 4 deletions(-)
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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Dale Farnsworth authored and Jeff Garzik committed Jan 17, 2006
1 parent 4eaa3cb commit 16e0301
Showing 1 changed file with 197 additions and 4 deletions.
201 changes: 197 additions & 4 deletions drivers/net/mv643xx_eth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
Expand Down Expand Up @@ -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);
}

/*
Expand Down Expand Up @@ -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
*
Expand Down Expand Up @@ -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);
}
}

Expand Down

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