When you upgrade Onload, you must also upgrade the sfc network driver to the version supplied with Onload.
The Onload Operator does not interact with the MachineConfig Operator (MCO), and so you must upgrade the sfc driver separately from Onload. You are recommended to update the sfc MachineConfig first, then when that has finished you should trigger the Onload upgrade. This results in a period of time after the machine has rebooted with the new sfc driver version, but with an old version of Onload. Onload-accelerated apps are not expected to work during this period, and you should wait until the Onload upgrade has finished before re-starting your workload.