[openib-general] Re: [PATCH 1 of 3] core: static rate encoding changesupport

[Roland Dreier]

    Waleri> Michael, Roland, There can be a situation where the
    Waleri> link/port speed gets changed for example from 12x to 4x...
    Waleri> Does OpenIb/IPoIB take care about this new configuration,
    Waleri> i.e. does stack reconfigure all qps by sending modify_qp
    Waleri> with the new link speed to inform hca about the change or
    Waleri> should hca take care about reconfiguring the qps?

No, this is a problem.  IPoIB should be OK because you can't change
port speeds without bringing the port down first, and that will
trigger a flush of all IPoIB path information.  But an RC QP can stay
connected even if the port goes down temporarily, and it would
continue to use the old static rate information.

But I don't think this is very likely in practice.

 - R.