mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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4405aa6006
git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@24007 3c298f89-4303-0410-b956-a3cf2f4a3e73
178 lines
5.2 KiB
Plaintext
178 lines
5.2 KiB
Plaintext
The original code does not work well when the number of mulitcast
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address to handle is greater than MCAST_MAX. It only enable promiscous
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mode instead of multicast hash table mode, so the hash table function
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will not be activated and all multicast frames will be recieved in this
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condition.
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This patch fixes the following issues with the r6040 NIC operating in
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multicast:
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1) When the IFF_ALLMULTI flag is set, we should write 0xffff to the NIC
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hash table registers to make it process multicast traffic.
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2) When the number of multicast address to handle is smaller than
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MCAST_MAX, we should use the NIC multicast registers MID1_{L,M,H}.
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3) The hashing of the address was not correct, due to an invalid
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substraction (15 - (crc & 0x0f)) instead of (crc & 0x0f) and an
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incorrect crc algorithm (ether_crc_le) instead of (ether_crc).
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4) If necessary, we should set HASH_EN flag in MCR0 to enable multicast
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hash table function.
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The version is for net-next-2.6:
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Reported-by: Marc Leclerc <marc-leclerc@signaturealpha.com>
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Tested-by: Marc Leclerc <marc-leclerc@signaturealpha.com>
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Signed-off-by: Shawn Lin <shawn@dmp.com.tw>
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Signed-off-by: Albert Chen <albert.chen@rdc.com.tw>
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---
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--- a/drivers/net/r6040.c
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+++ b/drivers/net/r6040.c
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@@ -70,6 +70,8 @@
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/* MAC registers */
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#define MCR0 0x00 /* Control register 0 */
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+#define PROMISC 0x0020 /* Promiscuous mode */
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+#define HASH_EN 0x0100 /* Enable multicast hash table function */
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#define MCR1 0x04 /* Control register 1 */
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#define MAC_RST 0x0001 /* Reset the MAC */
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#define MBCR 0x08 /* Bus control */
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@@ -837,76 +839,88 @@ static void r6040_multicast_list(struct
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{
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struct r6040_private *lp = netdev_priv(dev);
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void __iomem *ioaddr = lp->base;
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- u16 *adrp;
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- u16 reg;
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unsigned long flags;
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struct dev_mc_list *dmi = dev->mc_list;
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int i;
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+ u16 hash_table[4] = { 0 };
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- /* MAC Address */
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- adrp = (u16 *)dev->dev_addr;
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- iowrite16(adrp[0], ioaddr + MID_0L);
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- iowrite16(adrp[1], ioaddr + MID_0M);
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- iowrite16(adrp[2], ioaddr + MID_0H);
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-
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- /* Promiscous Mode */
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spin_lock_irqsave(&lp->lock, flags);
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/* Clear AMCP & PROM bits */
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- reg = ioread16(ioaddr) & ~0x0120;
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+ lp->mcr0 = ioread16(ioaddr + MCR0) & ~(PROMISC | HASH_EN);
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+
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+ /* Promiscuous mode */
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if (dev->flags & IFF_PROMISC) {
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- reg |= 0x0020;
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- lp->mcr0 |= 0x0020;
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+ lp->mcr0 |= PROMISC;
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}
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- /* Too many multicast addresses
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- * accept all traffic */
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- else if ((dev->mc_count > MCAST_MAX)
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- || (dev->flags & IFF_ALLMULTI))
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- reg |= 0x0020;
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- iowrite16(reg, ioaddr);
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- spin_unlock_irqrestore(&lp->lock, flags);
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-
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- /* Build the hash table */
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- if (dev->mc_count > MCAST_MAX) {
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- u16 hash_table[4];
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- u32 crc;
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+ /* Enable multicast hash table function to
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+ * receive all multicast packets. */
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+ else if (dev->flags & IFF_ALLMULTI) {
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+ lp->mcr0 |= HASH_EN;
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+
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+ for (i = 0; i < MCAST_MAX ; i++) {
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+ iowrite16(0, ioaddr + MID_1L + 8 * i);
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+ iowrite16(0, ioaddr + MID_1M + 8 * i);
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+ iowrite16(0, ioaddr + MID_1H + 8 * i);
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+ }
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for (i = 0; i < 4; i++)
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- hash_table[i] = 0;
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+ hash_table[i] = 0xffff;
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+ }
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- for (i = 0; i < dev->mc_count; i++) {
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- char *addrs = dmi->dmi_addr;
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+ /* Use internal multicast address registers if the number of
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+ * multicast addresses is not greater than MCAST_MAX. */
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+ else if (dev->mc_count <= MCAST_MAX) {
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+ i = 0;
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+ while (i < dev->mc_count) {
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+ u16 *adrp = (u16 *)dmi->dmi_addr;
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dmi = dmi->next;
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+ iowrite16(adrp[0], ioaddr + MID_1L + 8 * i);
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+ iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
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+ iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
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+ i++;
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+ }
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+ while (i < MCAST_MAX) {
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+ iowrite16(0, ioaddr + MID_1L + 8 * i);
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+ iowrite16(0, ioaddr + MID_1M + 8 * i);
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+ iowrite16(0, ioaddr + MID_1H + 8 * i);
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+ i++;
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+ }
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+ }
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+ /* Otherwise, Enable multicast hash table function. */
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+ else {
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+ u32 crc;
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- if (!(*addrs & 1))
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- continue;
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+ lp->mcr0 |= HASH_EN;
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- crc = ether_crc_le(6, addrs);
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- crc >>= 26;
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- hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
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+ for (i = 0; i < MCAST_MAX ; i++) {
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+ iowrite16(0, ioaddr + MID_1L + 8 * i);
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+ iowrite16(0, ioaddr + MID_1M + 8 * i);
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+ iowrite16(0, ioaddr + MID_1H + 8 * i);
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}
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- /* Fill the MAC hash tables with their values */
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+
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+ /* Build multicast hash table */
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+ for (i = 0; i < dev->mc_count; i++) {
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+ u8 *addrs = dmi->dmi_addr;
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+ dmi = dmi->next;
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+
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+ crc = ether_crc(ETH_ALEN, addrs);
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+ hash_table[crc >> 4] |= 1 << (crc & 0xf);
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+ }
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+ }
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+ iowrite16(lp->mcr0, ioaddr + MCR0);
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+
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+ /* Fill the MAC hash tables with their values */
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+ if (lp->mcr0 && HASH_EN) {
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iowrite16(hash_table[0], ioaddr + MAR0);
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iowrite16(hash_table[1], ioaddr + MAR1);
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iowrite16(hash_table[2], ioaddr + MAR2);
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iowrite16(hash_table[3], ioaddr + MAR3);
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}
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- /* Multicast Address 1~4 case */
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- dmi = dev->mc_list;
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- for (i = 0, dmi; (i < dev->mc_count) && (i < MCAST_MAX); i++) {
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- adrp = (u16 *)dmi->dmi_addr;
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- iowrite16(adrp[0], ioaddr + MID_1L + 8*i);
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- iowrite16(adrp[1], ioaddr + MID_1M + 8*i);
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- iowrite16(adrp[2], ioaddr + MID_1H + 8*i);
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- dmi = dmi->next;
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- }
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- for (i = dev->mc_count; i < MCAST_MAX; i++) {
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- iowrite16(0xffff, ioaddr + MID_1L + 8*i);
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- iowrite16(0xffff, ioaddr + MID_1M + 8*i);
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- iowrite16(0xffff, ioaddr + MID_1H + 8*i);
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- }
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+
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+ spin_unlock_irqrestore(&lp->lock, flags);
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}
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static void netdev_get_drvinfo(struct net_device *dev,
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