Commit 775919bc authored by Aidan Williams's avatar Aidan Williams Committed by David S. Miller
Browse files

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: default avatarAidan Williams <aidan@nicta.com.au>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7cc8f381

drivers/net/bfin_mac.c

+41 −1
Original line number Diff line number Diff line
@@ -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();

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