From: Florian Fainelli <florian@openwrt•org>
To: netdev@vger•kernel.org
Cc: David Miller <davem@davemloft•net>, darkadept@hispeed•ch
Subject: [PATCH] r6040: fix r6040_multicast_list
Date: Wed, 7 Apr 2010 13:18:48 +0200 [thread overview]
Message-ID: <201004071318.48883.florian@openwrt.org> (raw)
As reported in <https://bugzilla.kernel.org/show_bug.cgi?id=15355>, r6040_
multicast_list currently crashes. This is due a wrong maximum of multicast
entries. This patch fixes the following issues with multicast:
- number of maximum entries if off-by-one (4 instead of 3)
- the writing of the hash table index is not necessary and leads to invalid
values being written into the MCR1 register, so the MAC is simply put in a non
coherent state
- when we exceed the maximum number of mutlticast address, writing the
broadcast address should be done in registers MID_1{L,M,H} instead of
MID_O{L,M,H}, otherwise we would loose the adapter's MAC address
Signed-off-by: Florian Fainelli <florian@openwrt•org>
---
diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
index f5a0e96..83ebc75 100644
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -135,7 +135,7 @@
#define RX_DESC_SIZE (RX_DCNT * sizeof(struct r6040_descriptor))
#define TX_DESC_SIZE (TX_DCNT * sizeof(struct r6040_descriptor))
#define MBCR_DEFAULT 0x012A /* MAC Bus Control Register */
-#define MCAST_MAX 4 /* Max number multicast addresses to filter */
+#define MCAST_MAX 3 /* Max number multicast addresses to filter */
/* Descriptor status */
#define DSC_OWNER_MAC 0x8000 /* MAC is the owner of this descriptor */
@@ -983,9 +983,6 @@ static void r6040_multicast_list(struct net_device *dev)
crc >>= 26;
hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
}
- /* Write the index of the hash table */
- for (i = 0; i < 4; i++)
- iowrite16(hash_table[i] << 14, ioaddr + MCR1);
/* Fill the MAC hash tables with their values */
iowrite16(hash_table[0], ioaddr + MAR0);
iowrite16(hash_table[1], ioaddr + MAR1);
@@ -1001,9 +998,9 @@ static void r6040_multicast_list(struct net_device *dev)
iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
} else {
- iowrite16(0xffff, ioaddr + MID_0L + 8 * i);
- iowrite16(0xffff, ioaddr + MID_0M + 8 * i);
- iowrite16(0xffff, ioaddr + MID_0H + 8 * i);
+ iowrite16(0xffff, ioaddr + MID_1L + 8 * i);
+ iowrite16(0xffff, ioaddr + MID_1M + 8 * i);
+ iowrite16(0xffff, ioaddr + MID_1H + 8 * i);
}
i++;
}
next reply other threads:[~2010-04-07 11:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-07 11:18 Florian Fainelli [this message]
2010-04-07 23:51 ` [PATCH] r6040: fix r6040_multicast_list David Miller
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