[DPDK/other Bug 1649] igb_uio legacy mode can not be used in X710/XL710/XXV710

[DPDK/other Bug 1649] igb_uio legacy mode can not be used in X710/XL710/XXV710

[bugzilla]

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https://bugs.dpdk.org/show_bug.cgi?id=1649

            Bug ID: 1649
           Summary: igb_uio legacy mode can not be used in
                    X710/XL710/XXV710
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: other
          Assignee: dev@dpdk.org
          Reporter: nandinipersad361@gmail.com
  Target Milestone: ---

X710/XL710/XXV710 NICs lack support for indicating INTx is asserted via the
interrupt bit in the PCI status register. Linux deleted them from INTx support
table. The related commit.

Implication:
When insmod igb_uio with intr_mode=legacy and test link status interrupt. Since
INTx interrupt is not supported by X710/XL710/XXV710, it will cause
Input/Output error when reading file descriptor.

Resolution/Workaround:
Do not bind igb_uio with legacy mode in X710/XL710/XXV710 NICs, or do not use
kernel version >4.7 when you bind igb_uio with legacy mode.

Affected Environment/Platform:
ALL.

Driver/Module:
Poll Mode Driver (PMD).

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