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EMAC driver: bf537 MAC multicast hash filtering patch

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The bf537 Ethernet MAC driver in the 2007R1.1-RC3 kernel (and the
current kernel) do not implement multicast hash filtering. This
is a performance problem if you have lots of multicast on your network.

This patch plugs the right bits into the multicast hash registers.

Signed-off-by: Aidan Williams <aidan@nicta.com.au>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aidan Williams 2008-01-30 16:52:23 +08:00 committed by David S. Miller
parent 7cc8f38188
commit 775919bc23
1 changed files with 41 additions and 1 deletions
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42
drivers/net/bfin_mac.c
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@ -11,6 +11,7 @@
* Description:
*
* Modified:
* 2006-12-19 Aidan Williams, multicast hash support
* Copyright 2004-2006 Analog Devices Inc.
*
* Bugs: Enter bugs at http://blackfin.uclinux.org/
@ -800,6 +801,39 @@ static void bf537mac_timeout(struct net_device *dev)
netif_wake_queue(dev);
}
static void bf537mac_multicast_hash(struct net_device *dev)
{
u32 emac_hashhi, emac_hashlo;
struct dev_mc_list *dmi = dev->mc_list;
char *addrs;
int i;
u32 crc;
emac_hashhi = emac_hashlo = 0;
for (i = 0; i < dev->mc_count; i++) {
addrs = dmi->dmi_addr;
dmi = dmi->next;
/* skip non-multicast addresses */
if (!(*addrs & 1))
continue;
crc = ether_crc(ETH_ALEN, addrs);
crc >>= 26;
if (crc & 0x20)
emac_hashhi |= 1 << (crc & 0x1f);
else
emac_hashlo |= 1 << (crc & 0x1f);
}
bfin_write_EMAC_HASHHI(emac_hashhi);
bfin_write_EMAC_HASHLO(emac_hashlo);
return;
}
/*
* This routine will, depending on the values passed to it,
* either make it accept multicast packets, go into
@ -815,11 +849,17 @@ static void bf537mac_set_multicast_list(struct net_device *dev)
sysctl = bfin_read_EMAC_OPMODE();
sysctl |= RAF;
bfin_write_EMAC_OPMODE(sysctl);
} else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
} else if (dev->flags & IFF_ALLMULTI) {
/* accept all multicast */
sysctl = bfin_read_EMAC_OPMODE();
sysctl |= PAM;
bfin_write_EMAC_OPMODE(sysctl);
} else if (dev->mc_count) {
/* set up multicast hash table */
sysctl = bfin_read_EMAC_OPMODE();
sysctl |= HM;
bfin_write_EMAC_OPMODE(sysctl);
bf537mac_multicast_hash(dev);
} else {
/* clear promisc or multicast mode */
sysctl = bfin_read_EMAC_OPMODE();