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macb: Add multicast capability

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Add multicast capability to Atmel ethernet macb driver.

Signed-off-by: Patrice Vilchez <patrice.vilchez@rfo.atmel.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Patrice Vilchez 2007-07-12 19:07:25 +02:00 committed by Jeff Garzik
parent 6c36a70744
commit 446ebd0118
1 changed files with 120 additions and 0 deletions
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120
drivers/net/macb.c
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@ -796,6 +796,125 @@ static void macb_init_hw(struct macb *bp)
}
/*
* The hash address register is 64 bits long and takes up two
* locations in the memory map. The least significant bits are stored
* in EMAC_HSL and the most significant bits in EMAC_HSH.
*
* The unicast hash enable and the multicast hash enable bits in the
* network configuration register enable the reception of hash matched
* frames. The destination address is reduced to a 6 bit index into
* the 64 bit hash register using the following hash function. The
* hash function is an exclusive or of every sixth bit of the
* destination address.
*
* hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
* hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
* hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
* hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
* hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
* hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
*
* da[0] represents the least significant bit of the first byte
* received, that is, the multicast/unicast indicator, and da[47]
* represents the most significant bit of the last byte received. If
* the hash index, hi[n], points to a bit that is set in the hash
* register then the frame will be matched according to whether the
* frame is multicast or unicast. A multicast match will be signalled
* if the multicast hash enable bit is set, da[0] is 1 and the hash
* index points to a bit set in the hash register. A unicast match
* will be signalled if the unicast hash enable bit is set, da[0] is 0
* and the hash index points to a bit set in the hash register. To
* receive all multicast frames, the hash register should be set with
* all ones and the multicast hash enable bit should be set in the
* network configuration register.
*/
static inline int hash_bit_value(int bitnr, __u8 *addr)
{
if (addr[bitnr / 8] & (1 << (bitnr % 8)))
return 1;
return 0;
}
/*
* Return the hash index value for the specified address.
*/
static int hash_get_index(__u8 *addr)
{
int i, j, bitval;
int hash_index = 0;
for (j = 0; j < 6; j++) {
for (i = 0, bitval = 0; i < 8; i++)
bitval ^= hash_bit_value(i*6 + j, addr);
hash_index |= (bitval << j);
}
return hash_index;
}
/*
* Add multicast addresses to the internal multicast-hash table.
*/
static void macb_sethashtable(struct net_device *dev)
{
struct dev_mc_list *curr;
unsigned long mc_filter[2];
unsigned int i, bitnr;
struct macb *bp = netdev_priv(dev);
mc_filter[0] = mc_filter[1] = 0;
curr = dev->mc_list;
for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
if (!curr) break; /* unexpected end of list */
bitnr = hash_get_index(curr->dmi_addr);
mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
}
macb_writel(bp, HRB, mc_filter[0]);
macb_writel(bp, HRT, mc_filter[1]);
}
/*
* Enable/Disable promiscuous and multicast modes.
*/
static void macb_set_rx_mode(struct net_device *dev)
{
unsigned long cfg;
struct macb *bp = netdev_priv(dev);
cfg = macb_readl(bp, NCFGR);
if (dev->flags & IFF_PROMISC)
/* Enable promiscuous mode */
cfg |= MACB_BIT(CAF);
else if (dev->flags & (~IFF_PROMISC))
/* Disable promiscuous mode */
cfg &= ~MACB_BIT(CAF);
if (dev->flags & IFF_ALLMULTI) {
/* Enable all multicast mode */
macb_writel(bp, HRB, -1);
macb_writel(bp, HRT, -1);
cfg |= MACB_BIT(NCFGR_MTI);
} else if (dev->mc_count > 0) {
/* Enable specific multicasts */
macb_sethashtable(dev);
cfg |= MACB_BIT(NCFGR_MTI);
} else if (dev->flags & (~IFF_ALLMULTI)) {
/* Disable all multicast mode */
macb_writel(bp, HRB, 0);
macb_writel(bp, HRT, 0);
cfg &= ~MACB_BIT(NCFGR_MTI);
}
macb_writel(bp, NCFGR, cfg);
}
static int macb_open(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
@ -1025,6 +1144,7 @@ static int __devinit macb_probe(struct platform_device *pdev)
dev->stop = macb_close;
dev->hard_start_xmit = macb_start_xmit;
dev->get_stats = macb_get_stats;
dev->set_multicast_list = macb_set_rx_mode;
dev->do_ioctl = macb_ioctl;
dev->poll = macb_poll;
dev->weight = 64;