em driver: netif hangs the system if interface is cabled and configured but there is no link

[Andreas Nilsson]

On Thu, Jun 12, 2014 at 6:11 PM, John Jasem <jjasen at gmail.com> wrote:

> I'm configuring a system that's destined to be a multi-homed server,
> using Intel dual port 1GbE cards that rely on the em driver.
>
> em0 has link, and only needed configuration.
>
> In an attempt to be ahead of the game, I pre-configured em2, plugged in
> my side of the cable to be ready when the other side plugged theirs in,
> and rebooted the box.
>
> In this state, it appears the box will hang as netif works through
> interfaces defined in rc.conf. I'm not sure if permanently, but I'm
> willing to call 20 minutes 'permanent' for the purposes of this exercise.
>
> I eventually was able to narrow it down to the configurations for em2,
> and em2 not having link WHILE a cable was plugged in. I was able to
> replicate the expected condition by unplugging the cable, and was able
> to replicate the failure condition on em1 and em3 by moving the cable
> and configurations.
>
> Any thoughts? Am I missing something?
>
> -- John Jasen (jjasen at gmail.com)
>
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If it is a dual port card, shouldn't it be em0 and em1 ?

Best regards
Andreas