[openib-general] [PATCH] Allow setting of NodeDescription

[Eitan Zahavi]

Fab Tillier wrote:
>>From: Roland Dreier [mailto:rolandd at cisco.com]
>>Sent: Thursday, September 15, 2005 9:01 AM
>>
>>    Jack> The resulting set of NodeDescription strings present in the
>>    Jack> SM and SA could then be a race-dependent salad (depending on
>>    Jack> the timing of QP0 entering RTS state, SM subnet sweep, and
>>    Jack> resetting of the local NodeDescription string).
>>
>>Yes, it's unfortunate.
>>
>>But I don't see any way to handle the situation arising when booting
>>over IB, where a system needs the SM to bring its port to active
>>before it can boot, but where the system doesn't know its host name
>>until after it boots.
> 
> 
> What happens during the handoff from the boot environment to the OS?
> Does the
> HCA get disabled and then the mthca driver starts fresh?  Or does the
> mthca
> driver inherit a device that is already fully initialized.  If it gets
> re-initialized, don't the ports go down when the boot agent shuts down
> (and the
> SM should get a GID out of service trap), 

Actually the SM will get either a port state change unaffiliated async event if
the subnet has no switch, or a Trap 128 from the switch connected to the rebooted HCA.

EZ
followed by the ports going up
> when
> mthca starts?  Or is the problem that the boot driver doesn't know when
> the
> handoff is, and thus can't disable the device?
> 
> Thanks,
> 
> - Fab
> 
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