I think the packets were are detecting may be Backward Explicit Congestion Notification (BECN) packets used for congestion control for UC transfers. These Congestion Notification Packets (CNP) are described in the IB specification Annex A10 on Congestion Control. The CNP has 0x80 for the op code, according to Annex A10.3.2. The newer versions of OFED, starting around version 2.0 have support for congestion control. Can anyone confirm this information? Is anyone enabling Congestion Control in their network?
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