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r6040: fix r6040_multicast_list 

As reported in <https://bugzilla.kernel.org/show_bug.cgi?id=15355>, r6040_
multicast_list currently crashes. This is due a wrong maximum of multicast
entries. This patch fixes the following issues with multicast:

- number of maximum entries if off-by-one (4 instead of 3)

- the writing of the hash table index is not necessary and leads to invalid
values being written into the MCR1 register, so the MAC is simply put in a non
coherent state

- when we exceed the maximum number of mutlticast address, writing the
broadcast address should be done in registers MID_1{L,M,H} instead of
MID_O{L,M,H}, otherwise we would loose the adapter's MAC address

Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2010-04-07 16:50:58 -07:00 committed by David S. Miller
parent 005c93b5d8
commit 3bcf8229a8
1 changed files with 4 additions and 7 deletions
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11
drivers/net/r6040.c
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@ -135,7 +135,7 @@
#define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor))
#define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor))
#define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */
#define MCAST_MAX 4 /* Max number multicast addresses to filter */
#define MCAST_MAX 3 /* Max number multicast addresses to filter */
/* Descriptor status */
#define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */
@ -983,9 +983,6 @@ static void r6040_multicast_list(struct net_device *dev)
crc >>= 26;
hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
}
/* Write the index of the hash table */
for (i = 0; i < 4; i++)
iowrite16(hash_table[i] << 14, ioaddr + MCR1);
/* Fill the MAC hash tables with their values */
iowrite16(hash_table[0], ioaddr + MAR0);
iowrite16(hash_table[1], ioaddr + MAR1);
@ -1001,9 +998,9 @@ static void r6040_multicast_list(struct net_device *dev)
iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
} else {
iowrite16(0xffff, ioaddr + MID_0L + 8 * i);
iowrite16(0xffff, ioaddr + MID_0M + 8 * i);
iowrite16(0xffff, ioaddr + MID_0H + 8 * i);
iowrite16(0xffff, ioaddr + MID_1L + 8 * i);
iowrite16(0xffff, ioaddr + MID_1M + 8 * i);
iowrite16(0xffff, ioaddr + MID_1H + 8 * i);
}
i++;
}