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SubjectRe: Sun GEM card looses TX on x86 32bit PCI
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Hi David,

It seems I fubar'd. I recompiled the module and run it through the test
again... no hang. It looks like I forgot to copy the new module into my
/lib/modules/<blah>. Apologies for messing up there.

Anyway... the new driver still drops packets after the initial RX
overflow, so I had a poke around with it and I've seen some definate
improvement by forcing the whole chip to reset when the RX overflows.

My modifications to the driver are evil and I only intend them to be a
test, but it helps to shed some extra light on what's going on.

When the chip does a full reset I loose a whole load of packets, but I'm
guessing this is normal :(

Also, I can't remember where I read it, but the Extreme Summit 48 is
supposed to support *receiving* the xon/xoff Pause stuff (I'm no expert
in this area, so I could be talking complete twaddle!), no transmit
capability though.

Here's what I get out of the module when it resets (with my limit=5000
mod);

eth0: RX buffer overflowed - running rxmac_reset
eth0: RX MAC resetting
eth0: RX MAC *ONLY* reset
eth0: RX MAC reset ok?
eth0: RX MAC will not disable, resetting whole chip.
eth0: PCS AutoNEG complete.
eth0: PCS link is now up.

Without the limit=5000, it appears that the module detects the RX
section is "un-hung" when it isn't.

Cheers,

Beezly

On Mon, 2002-03-11 at 19:02, David S. Miller wrote:
> From: Beezly <beezly@beezly.org.uk>
> Date: 11 Mar 2002 18:35:01 +0000
>
> Sorry it took so long for me to get back to you. Sadly it also hung with
> this patch ;) I was unable to get an oops out of it (machine was
> completely hosed and in X so I couldn't even note the oops on paper :(
> ).
>
> So rerun the test not under X please?

--- sungem.c Mon Mar 11 20:37:57 2002
+++ sungem.c.testing Mon Mar 11 20:31:12 2002
@@ -302,14 +302,23 @@
u64 desc_dma;
u32 val;

+ printk(KERN_ERR "%s: RX MAC resetting\n", dev->name);
/* First, reset MAC RX. */
writel(gp->mac_rx_cfg & ~MAC_RXCFG_ENAB,
gp->regs + MAC_RXCFG);
+ printk(KERN_ERR "%s: RX MAC *ONLY* reset\n", dev->name);
+
for (limit = 0; limit < 5000; limit++) {
- if (!(readl(gp->regs + MAC_RXCFG) & MAC_RXCFG_ENAB))
+ if (!(readl(gp->regs + MAC_RXCFG) & MAC_RXCFG_ENAB)) {
+ printk(KERN_ERR "%s: RX MAC reset ok?\n", dev->name);
break;
+ }
udelay(10);
}
+
+ /* RX MAC reset doesn't appear to work so I force a whole reset */
+ limit = 5000;
+
if (limit == 5000) {
printk(KERN_ERR "%s: RX MAC will not disable, resetting whole "
"chip.\n", dev->name);
@@ -323,6 +332,9 @@
break;
udelay(10);
}
+
+ limit=5000;
+
if (limit == 5000) {
printk(KERN_ERR "%s: RX DMA will not disable, resetting whole "
"chip.\n", dev->name);
@@ -399,6 +411,8 @@
if (rxmac_stat & MAC_RXSTAT_OFLW) {
gp->net_stats.rx_over_errors++;
gp->net_stats.rx_fifo_errors++;
+ printk(KERN_DEBUG "%s: RX buffer overflowed - running rxmac_reset\n",
+ gp->dev->name);

ret = gem_rxmac_reset(gp);
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