KNI deadlocks when used with Mellanox device

https://bugs.dpdk.org/show_bug.cgi?id=410

            Bug ID: 410
           Summary: KNI deadlocks when used with Mellanox device
           Product: DPDK
           Version: 18.02
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

The KNI driver calls out to userspace holding the kernel networking lock (RTNL).
This causes deadlock when a DPDK device driver (like Mellanox) needs to interact with the kernel to change the underlying device.

This is a design flaw in the original implementation of KNI, only exposed by the first bifurcated drivers.

See: https://patchwork.dpdk.org/patch/64106/

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