openwrt/target/linux/rdc/patches-2.6.32/015-r6040_fix_multicast.patch

The original code does not work well when the number of mulitcast
address to handle is greater than MCAST_MAX. It only enable promiscous
mode instead of multicast hash table mode, so the hash table function
will not be activated and all multicast frames will be recieved in this
condition.

This patch fixes the following issues with the r6040 NIC operating in
multicast:

1) When the IFF_ALLMULTI flag is set, we should write 0xffff to the NIC
hash table registers to make it process multicast traffic.

2) When the number of multicast address to handle is smaller than
MCAST_MAX, we should use the NIC multicast registers MID1_{L,M,H}.

3) The hashing of the address was not correct, due to an invalid
substraction (15 - (crc & 0x0f)) instead of (crc & 0x0f) and an
incorrect crc algorithm (ether_crc_le) instead of (ether_crc).

4) If necessary, we should set HASH_EN flag in MCR0 to enable multicast
hash table function.


The version is for net-next-2.6:

Reported-by: Marc Leclerc <marc-leclerc@signaturealpha.com>
Tested-by: Marc Leclerc <marc-leclerc@signaturealpha.com>
Signed-off-by: Shawn Lin <shawn@dmp.com.tw>
Signed-off-by: Albert Chen <albert.chen@rdc.com.tw>
---
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -70,6 +70,8 @@
 
 /* MAC registers */
 #define MCR0		0x00	/* Control register 0 */
+#define  PROMISC	0x0020	/* Promiscuous mode */
+#define  HASH_EN	0x0100	/* Enable multicast hash table function */
 #define MCR1		0x04	/* Control register 1 */
 #define  MAC_RST	0x0001	/* Reset the MAC */
 #define MBCR		0x08	/* Bus control */
@@ -837,76 +839,88 @@ static void r6040_multicast_list(struct
 {
 	struct r6040_private *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->base;
-	u16 *adrp;
-	u16 reg;
 	unsigned long flags;
 	struct dev_mc_list *dmi = dev->mc_list;
 	int i;
+	u16 hash_table[4] = { 0 };
 
-	/* MAC Address */
-	adrp = (u16 *)dev->dev_addr;
-	iowrite16(adrp[0], ioaddr + MID_0L);
-	iowrite16(adrp[1], ioaddr + MID_0M);
-	iowrite16(adrp[2], ioaddr + MID_0H);
-
-	/* Promiscous Mode */
 	spin_lock_irqsave(&lp->lock, flags);
 
 	/* Clear AMCP & PROM bits */
-	reg = ioread16(ioaddr) & ~0x0120;
+	lp->mcr0 = ioread16(ioaddr + MCR0) & ~(PROMISC | HASH_EN);
+
+	/* Promiscuous mode */
 	if (dev->flags & IFF_PROMISC) {
-		reg |= 0x0020;
-		lp->mcr0 |= 0x0020;
+		lp->mcr0 |= PROMISC;
 	}
-	/* Too many multicast addresses
-	 * accept all traffic */
-	else if ((dev->mc_count > MCAST_MAX)
-		|| (dev->flags & IFF_ALLMULTI))
-		reg |= 0x0020;
 
-	iowrite16(reg, ioaddr);
-	spin_unlock_irqrestore(&lp->lock, flags);
-
-	/* Build the hash table */
-	if (dev->mc_count > MCAST_MAX) {
-		u16 hash_table[4];
-		u32 crc;
+	/* Enable multicast hash table function to
+	 * receive all multicast packets. */
+	else if (dev->flags & IFF_ALLMULTI) {
+		lp->mcr0 |= HASH_EN;
+
+		for (i = 0; i < MCAST_MAX ; i++) {
+			iowrite16(0, ioaddr + MID_1L + 8 * i);
+			iowrite16(0, ioaddr + MID_1M + 8 * i);
+			iowrite16(0, ioaddr + MID_1H + 8 * i);
+		}
 
 		for (i = 0; i < 4; i++)
-			hash_table[i] = 0;
+			hash_table[i] = 0xffff;
+	}
 
-		for (i = 0; i < dev->mc_count; i++) {
-			char *addrs = dmi->dmi_addr;
+	/* Use internal multicast address registers if the number of
+	 * multicast addresses is not greater than MCAST_MAX. */
+	else if (dev->mc_count <= MCAST_MAX) {
+		i = 0;
+		while (i < dev->mc_count) {
+			u16 *adrp = (u16 *)dmi->dmi_addr;
 
 			dmi = dmi->next;
+			iowrite16(adrp[0], ioaddr + MID_1L + 8 * i);
+			iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
+			iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
+			i++;
+		}
+		while (i < MCAST_MAX) {
+			iowrite16(0, ioaddr + MID_1L + 8 * i);
+			iowrite16(0, ioaddr + MID_1M + 8 * i);
+			iowrite16(0, ioaddr + MID_1H + 8 * i);
+			i++;
+		}
+	}
+	/* Otherwise, Enable multicast hash table function. */
+	else {
+		u32 crc;
 
-			if (!(*addrs & 1))
-				continue;
+		lp->mcr0 |= HASH_EN;
 
-			crc = ether_crc_le(6, addrs);
-			crc >>= 26;
-			hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
+		for (i = 0; i < MCAST_MAX ; i++) {
+			iowrite16(0, ioaddr + MID_1L + 8 * i);
+			iowrite16(0, ioaddr + MID_1M + 8 * i);
+			iowrite16(0, ioaddr + MID_1H + 8 * i);
 		}
-		/* Fill the MAC hash tables with their values */
+
+		/* Build multicast hash table */
+		for (i = 0; i < dev->mc_count; i++) {
+			u8 *addrs = dmi->dmi_addr;
+			dmi = dmi->next;
+
+			crc = ether_crc(ETH_ALEN, addrs);
+			hash_table[crc >> 4] |= 1 << (crc & 0xf);
+		}
+	}
+	iowrite16(lp->mcr0, ioaddr + MCR0);
+
+	/* Fill the MAC hash tables with their values */
+	if (lp->mcr0 && HASH_EN) {
 		iowrite16(hash_table[0], ioaddr + MAR0);
 		iowrite16(hash_table[1], ioaddr + MAR1);
 		iowrite16(hash_table[2], ioaddr + MAR2);
 		iowrite16(hash_table[3], ioaddr + MAR3);
 	}
-	/* Multicast Address 1~4 case */
-	dmi = dev->mc_list;
-	for (i = 0, dmi; (i < dev->mc_count) && (i < MCAST_MAX); i++) {
-		adrp = (u16 *)dmi->dmi_addr;
-		iowrite16(adrp[0], ioaddr + MID_1L + 8*i);
-		iowrite16(adrp[1], ioaddr + MID_1M + 8*i);
-		iowrite16(adrp[2], ioaddr + MID_1H + 8*i);
-		dmi = dmi->next;
-	}
-	for (i = dev->mc_count; i < MCAST_MAX; i++) {
-		iowrite16(0xffff, ioaddr + MID_1L + 8*i);
-		iowrite16(0xffff, ioaddr + MID_1M + 8*i);
-		iowrite16(0xffff, ioaddr + MID_1H + 8*i);
-	}
+
+	spin_unlock_irqrestore(&lp->lock, flags);
 }
 
 static void netdev_get_drvinfo(struct net_device *dev,