diff options
| author | Aidan Williams <aidan@nicta.com.au> | 2008-01-30 16:52:23 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-02-03 04:28:47 -0800 |
| commit | 775919bc23880f250ca1029a6420187ee4bb5b26 (patch) | |
| tree | 1dc0ce2d7f978ea912cea8bfcc2c540f682b308e /drivers | |
| parent | 7cc8f38188133e0c278b9f207d63c2c2b4d98236 (diff) | |
EMAC driver: bf537 MAC multicast hash filtering patch
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/bfin_mac.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c index ee398196ea8..c6586cdb8b9 100644 --- a/drivers/net/bfin_mac.c +++ b/drivers/net/bfin_mac.c @@ -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(); |