[openib-general] APM support in openib stack

[Venkatesh Babu]

All the patches are attached to the bugzilla bug reports.

Yes, it is possible to enhance  ib_cm_init_qp_attr(), but it requires a 
new parameter *alternate_path and changing it might break the 
compatibility with the existing code. So I thought, it is better to add 
new interface, so that it won't cause any interference with the existing 
code. And also initializing QP attributes for rearming is slightly 
different than initializing QP attributes for bringing it up.

Loading the alternate path may not necessarily indicate the failover. It 
is just saying that alternate path is available. Failover actually 
happens only when primary path's any components like local port or 
remote port or switch port goes down. We should get some events when 
this happens to cause the failover.

 VBabu

Sean Hefty wrote:

>>I have implemented this interface and proposing this in bug#172. You
>>have to patch it manually to get it working.
>>    
>>
>
>Can you post the patch to the list?  If the functionality is needed, I'd like to
>queue it for 2.6.20.  Although, I'd prefer if the existing ib_cm_init_qp_attr()
>routine were used with state handling instead of adding a new API routine.
>
>And thinking about it more, we might be able to use that call as the indication
>to the ib_cm to failover to the alternate path.
>
>- Sean
>  
>