Broadcom Ethernet interface broken under kernel-xen (module issue?)

[Naoki]

I just noticed this (and I think reported in fedora-devel) that under a
new FC6 install using kernel-xen-2.6.18-1.2798.fc6 the 'eth0' device
would DHCP and obtain an IP address, but then would be unable to ping
even the default route, and would not respond to 'ethtool' commands,
only stating "Link: Yes".  'mii-tool' just barfs saying "Operation
not
supported". Problem also seems to be in kernel-xen-2.6.19-1.2895.fc6
although I have some problems blocking testing there.

I have seen this on an IBM server and a Dell desktop, both using
Broadcom adaptors.

Sounds to be the same issues as 
http://lists.xensource.com/archives/html/xen-users/2006-07/msg00599.html
http://lists.xensource.com/archives/html/xen-users/2006-08/msg00553.html



Working (until IRQ bug kills it) 2.6.19-1.2895.fc6
alias eth0 tg3
# lspci |grep -i eth
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5751
Gigabit Ethernet PCI Express (rev 01)


Working 2.6.18-1.2798.fc6
alias eth0 bnx2
# lspci |grep -i eth
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708
Gigabit Ethernet (rev 11)
06:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708
Gigabit Ethernet (rev 11)


And this BZ looks like the same problem, I'll add my info there unless
anybody tells me I'm on the wrong track..
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=213991