[openib-general] APM support in openib stack

[Sean Hefty]

Venkatesh Babu wrote:
> 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.

 From the CM's perspective, I see that two (independent) things need to occur:

1. The CM itself must failover to the alternate path.
2. The CM must allow loading a new alternate path.

The call ib_send_cm_lap() should be used to load a new alternate path, and would 
be independent of failover.  And ib_cm_init_qp_attr() could be used to notify 
the CM that failover has occurred, based on the state of the connection.


- Sean