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SubjectRe: net: skge breakage on 2.6.24-rc1
On Wed, Nov 07, 2007 at 11:46:21PM +0200, Heikki Orsila wrote:
> After some bisecting, I found that net skge driver broke on
> commit 7fb7ac241162dc51ec0f7644d4a97b2855213c32
> My network card is:
> 0000:00:0e.0 Ethernet controller: 3Com Corporation 3c940 10/100/1000Base-T [Marvell] (rev 12)
> Linux cheradenine 2.6.24-rc1-dirty #15 Wed Nov 7 23:39:28 EET 2007 x86_64 GNU/Linux

Sorry, forgot to say what the problem is. Doing

nc host port < /dev/zero

on a sending machine (not skge) to an skge machine that is receiving:

nc -l -p port >/dev/null

with ~60 MiB/s speed, causes the interface go malfunct. A slow
transfer doesn't cause a problem.

Also, after some fiddling, I noticed that not changing the register
write order on patch:

+ skge_write32(hw, RB_ADDR(q, RB_END), end);
skge_write32(hw, RB_ADDR(q, RB_WP), start);
skge_write32(hw, RB_ADDR(q, RB_RP), start);
- skge_write32(hw, RB_ADDR(q, RB_END), end);

fixes the visible effect.. Possibly not the root cause of the problem,
but changing the order back fixes networking here.

Heikki Orsila Barbie's law: "Math is hard, let's go shopping!"
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