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Subject[path] via-rhine.c
Date

hello list,

this patch is agains 1.15 of via-rhine.c
it isn't supposed to be a fix, but a workaround. if you have any
better idea why the error is occuring, you are welcome.

regards,
h.rosmanith


--- via-rhine.c.p9-debug Thu Aug 29 07:14:12 2002
+++ via-rhine.c Thu Aug 29 07:12:43 2002
@@ -100,6 +100,15 @@
- allow selecting backoff algorithm (module parameter)
- cosmetic cleanups, remove 3 unused members of struct netdev_private

+ preliminary: (Herbert Rosmanith):
+ - for some yet unknown reason (which seems to be collision-related),
+ TX DMA is off in via_rhine_interrupt in the ChipCmd register. this
+ leads to an entry in the ringbuffer which is never processed and
+ therefore blocks the ringbuffer. the hack provided sets the TxRingPtr
+ in the chip to the entry blocking the ringbuffer, marking it for
+ being processed again. this error seems to happen only with the VT6103.
+
*/

#define DRV_NAME "via-rhine"
@@ -474,6 +483,8 @@

#define MAX_MII_CNT 4
struct netdev_private {
+ // XXX hack hack hack
+ int intr_cmd;
/* Descriptor rings */
struct rx_desc *rx_ring;
struct tx_desc *tx_ring;
@@ -1294,11 +1305,13 @@
static void via_rhine_interrupt(int irq, void *dev_instance, struct pt_regs *rgs)
{
struct net_device *dev = dev_instance;
+ struct netdev_private *np=dev->priv;
long ioaddr;
u32 intr_status;
int boguscnt = max_interrupt_work;

ioaddr = dev->base_addr;
+ np->intr_cmd=readw(ioaddr+ChipCmd); // needed later in via_rhine_tx

while ((intr_status = readw(ioaddr + IntrStatus))) {
/* Acknowledge all of the current interrupt sources ASAP. */
@@ -1350,8 +1363,12 @@
if (debug > 6)
printk(KERN_DEBUG " Tx scavenge %d status %8.8x.\n",
entry, txstatus);
- if (txstatus & DescOwn)
+ if (txstatus & DescOwn) {
+ if ((np->intr_cmd&0x0010)==0) // Gack! DMA is off
+ writel(np->tx_ring_dma + entry * sizeof(struct tx_desc),
+ dev->base_addr+TxRingPtr);
break;
+ }
if (txstatus & 0x8000) {
if (debug > 1)
printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
-
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