[openib-general] APM support in openib stack

[Sean Hefty]

>The problem is for the the remote node where RC QP listen was accepted
>this connection (Passive side). There is no way for this node to know
>that port failure has occurred on the Active side. So it requires some
>interfaces to get this notification. So ib_sa_serv_notice_hdlr()
>interface as described in the patch attached to bug#159 can be used to
>register for the remote port events. This interface has to be called
>separately for for PORT_ERR and PORT_ACTIVE events. When the handler for
>remote PORT_ERR occurs, then RC QP's path_mig_state can be changed to
>IB_MIG_MIGRATED to cause the failover.

Hal pointed me to your patches for this, since I'm working on adding InformInfo
/ Notice support.  I believe that a good portion of the code there is usable.
What I didn't see in the patch was reference counting to handle multiple users
registering for the same event, but I'm planning on leveraging the multicast
handling code for that.

- Sean