Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=775919bc23880f250ca1029a6420187ee4bb5b26
Commit: 775919bc23880f250ca1029a6420187ee4bb5b26
Parent: 7cc8f38188133e0c278b9f207d63c2c2b4d98236
Author: Aidan Williams <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 16:52:23 2008 +0800
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Sun Feb 3 04:28:47 2008 -0800
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 <[EMAIL PROTECTED]>
Signed-off-by: Bryan Wu <[EMAIL PROTECTED]>
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
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 ee39819..c6586cd 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();
-
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