Fwd: Re: [openib-general] static LID computation with TS_HOST_DRIVER

[David M. Brean]

Hello,

A couple of clarifying statements about this problem:

1) assignment of the IP address to the platform ethernet during boot has 
nothing to do with LID assignment.  [If it does, why is there a 
relationship?]

2) in the version of the software Tom is using, the ib_mthca driver will 
pick a LID if it doesn't find an IB port in the ACTIVE (or ARMED) 
state.  This is a hack and Roland has removed the hack from the latest 
version of the software.

If both (1) and (2) are true, is there still a plan to implement a 
mechanism where the applications can create connections before the SM 
assigns a LID and brings the port up to ACTIVE state?  [I hope the 
response is "no".]

-David

Roland Dreier wrote:

>    Tom> [KERNEL_IB][ib_mad_static_compute_base][/build1/tduffy/openib-work/linux-2.6.9-rc2-openib/drivers/infiniband/core/mad_static.c:94]Couldn't
>    Tom> find a suitable network device; setting lid_base to 1
>
>    Tom> I am trying to track down why this is happening, but it seems
>    Tom> to pop up when the ib_mthca driver is loaded at boot time on
>    Tom> my sparc64 box (haven't tested other architectures).
>
>    Tom> I guess you need to have your ethernet driver loaded in and
>    Tom> up with an IP address /before/ you load ib_mthca?  What if
>    Tom> this is not the case?
>
>Yeah, if it can't find a configured interface it bails out and picks
>1.  It's benign and it will go away when we switch MAD layers.  In
>fact I'm going to disable it on my tree now...
>
>    Tom> Anyways, I thought the LID would be assigned by the SM...
>
>Yeah, this is a hack to try and pick a LID that the SM won't change.
>Some applications create connections before the SM has discovered the
>node and don't want them broken when the SM does come around.
>
> - R.
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