[openib-general] APM: QP migration state change when failover triggered by hw

[Venkatesh Babu]

 According to IB Spec either Verbs consumer or CI can initiate the path 
migration, but it doesn't describe the poliy who should initiate the 
path migration and doesn't cleary define who should change the state in 
each case.

 If the hca (mthca0 - MT25208) supports automatic path migration when 
the port error (for example pulling the cable) occurrs, who is 
responsible for changeing the QP state from "Armed" to "Migrated" ? Is 
it the CI or the verbs consumer ?

 With the same MT25208 HCA, using the Gen1 code this APM functionality 
works fine. When cable is removed from the port corresponding to primary 
path, CI migrates to the alternate path; changes the QP state from 
"Armed" to "Migrated" and sends an event IB_QP_PATH_MIGRATED to verbs 
consumer.

 With OFED 1.0, when cable is removed from the port corresponding to the 
primary path, CI sends an event IB_EVENT_PATH_MIG, but is not changeing 
the state to "Migrated" and not migrating to the alternate path.  So the 
traffic doesn't resume on the alternate path.

 With OFED 1.0, verbs consumer initiates the failover by explicitly 
changing the state from "Armed" to "Migrated", it correctly migrates to 
the alternate path and traffic resumes on that.

 VBabu