netdev - 2.6.29 forcedeth: NIC always asleep/borked at reboot. Boot hangs@...P-Discover

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Date:	Fri, 03 Apr 2009 19:39:27 +0000
From:	"Sasha V. Alexandr" <s.alexandr@...h.com>
To:	netdev@...r.kernel.org
Cc:	s.alexandr@...h.com
Subject: 2.6.29 forcedeth: NIC always asleep/borked at reboot. Boot hangs@...P-Discover 

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Hi netdev folks,

I have been following the several threads regarding forcedeth since
the release of 2.6.29 and mainly they are focused on NAPI-troubles-
or-not, and WOL not working. I think what I am experiencing since
2.6.29 is directly related to neither WOL nor NAPI, but is a
forcedeth issue. I do not use WOL (wake-on-lan is a BIOS option I
have unset) and the problem happens whether I enable NAPI or not.
Currently I have NAPI disabled.

The email subject says it all; at reboot with 2.6.29, the NIC seems
to be AWOL/asleep/powered-off, and boot hangs at DHCP Discover
until the dhcpd wait-delay expires (60 secs currently). Once I have
my desktop (or console, whatever) I stop and restart the network a
few times (ifconfig eth0 down/up/down/up and ./rc.inet1 restart)
and the NIC comes back to life and gets its IP address after a
short delay.

With 2.6.28.7, the NIC gets an IP address instantly during boot, in
a half-blink of an eye, no visible delay at all.

Both kernels are identical in their configurations (same .config
file used), and neither are tainted. I have saved a dmesg from each
kernel, and they are as expected pretty similar except for the lack
of DHCP communications on the 2.6.29 dmesg.

I am suspecting the following:

commit cb52deba12f27af90a46d2f8667a64888118a888
forcedeth: power down phy when interface is down

though I could be way off; but nothing else RE:forcedeth in the
2.6.29 changelog popped out at me as a possible suspect.

Motherboard: MSI-7350 (nVidia P6N-SLI-FI)
NIC: Realtek 8211BL
DHCP server: locally connected ISC-DHCP-3.1.2, serves my LAN
OS: Slackware 11
BIOS: MSI ver 2.7

I was not sure whether I should paste a whole lot of dmesg stuff
here, or what might be useful, so I'll ask now: any further input I
can supply like dmesges or ifconfig output, lspci output, or
whatever, or you want me to test patches or try something else, I
can do. I have the time. Ask and ye shall receive. And if so, CC me
if you like, but I'll be watching the netdev list anyhow.

Many thanks,
Sasha Alexandr

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