--- /dev/null
+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,
projects / openwrt / svn-archive / archive.git / commitdiff