To solve this problem, this update implements custom ifup-ib and ifdown-ib network scripts that are aware of the portion of an IPoIB's MAC address that is constant versus the portion that is subject to change. Consequently, when users created ifcfg-ibX files that specified the MAC address of the IPoIB interface, after a reload of the IPoIB kernel module, when the MAC address no longer matched, the IPoIB interface failed to be recognized as a configured interface by the network subsystem. Because the queue pair number is encoded in the MAC address of the IPoIB interface, and because it can change when the IPoIB module is unloaded and reloaded, the final MAC address of IPoIB interfaces can change. However, when unloading and reloading the IPoIB module, it is likely that a different queue pair to the IPoIB queue pair will be assigned. The queue pair that the interface is attached to is encoded in the hardware MAC address. The IPoIB interface has a generated hardware MAC address. IP over InfinBand ( IPoIB) interfaces are artificial constructs created on top of InfiniBand RDMA devices.
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