* [dpdk-dev] [Bug 410] KNI deadlocks when used with Mellanox device
@ 2020-02-25 23:52 bugzilla
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From: bugzilla @ 2020-02-25 23:52 UTC (permalink / raw)
To: dev
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: dev@dpdk.org
Reporter: stephen@networkplumber.org
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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