em loses link after IPMI reset

[Jason Wolfe]

Andrey,

Are you running Supermicro hardware by chance?  We had a very similar issue
that was caused by a buggy version of the IPMI firmware on a good number of
machines with the same 82574 chips.  At any rate, might give the IPMI
update a try and see if that changes the behavior at all.

Jason

On Sun, Jan 15, 2012 at 12:17 PM, Andrey Zonov <andrey at zonov.org> wrote:

> Hi,
>
> I have a few boxes with Intel 82574L NIC that run under 8.2-STABLE.  After
> execution `ipmitool mc reset cold' NIC loses link and after negotiation it
> sets 100TX media type (normal is 1000T).  Under Linux on the same box this
> problem doesn't occur, after BMC reset driver doesn't lose link.
>
> It seems that em driver sets (or doesn't set) some IPMI relied registers.
>  In Linux there is some magic about 82574/82583 chips and IPMI [1].  What
> do you think this is a solution for my problem or this is about something
> else?
>
>
> [1]
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/net/ethernet/intel/e1000e/netdev.c;h=3911401ed65d59ceafe9b28080a6630f4adf6371;hb=HEAD#l2696
>
> --
> Andrey Zonov
>
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