[DPDK/core Bug 1657] Unsuitable IOVA mode may be picked as the default

[DPDK/core Bug 1657] Unsuitable IOVA mode may be picked as the default

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1657

            Bug ID: 1657
           Summary: Unsuitable IOVA mode may be picked as the default
           Product: DPDK
           Version: 18.11
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: nandinipersad361@gmail.com
  Target Milestone: ---

Not all kernel drivers and not all devices support all IOVA modes. EAL will
attempt to pick a reasonable default based on a number of factors, but there
may be cases where the default may be unsuitable (for example, hotplugging
devices using igb_uio driver while having picked IOVA as VA mode on EAL
initialization).

Implication
Some devices (hotplugged or otherwise) may not work due to incompatible IOVA
mode being automatically picked by EAL.

Resolution/Workaround:
It is possible to force EAL to pick a particular IOVA mode by using the
–iova-mode command-line parameter. If conflicting requirements are present
(such as one device requiring IOVA as PA and one requiring IOVA as VA mode),
there is no workaround.

Affected Environment/Platform:
Linux.

Driver/Module:
ALL.

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