[dpdk-dev] [Bug 322] eal: ctrl thread calculation assumes 1:1 mapping between cpu and lcore id

[dpdk-dev] [Bug 322] eal: ctrl thread calculation assumes 1:1 mapping between cpu and lcore id

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=322

            Bug ID: 322
           Summary: eal: ctrl thread calculation assumes 1:1 mapping
                    between cpu and lcore id
           Product: DPDK
           Version: 18.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: core
          Assignee: dev@dpdk.org
          Reporter: johan.kallstrom@ericsson.com
  Target Milestone: ---

ctrl thread calculation assumes 1:1 mapping between cpu and lcore id.
This is not the case when --lcores and the optional cpuset mask is used. 
The calculation introduced in c3568ea376700 (and 18.11.2 23a9f69ed3d9) assumes
a 1:1 mapping between cpu and lcore id. This is not the case when --lcores and
the optional cpuset mask is used.

The calculation fails when --lcores and cpuset mask is set so cpu and lcore no
longer maps 1:1.

The code silently started on the wrong physical thread with following eal
arguments(if not cpusets are used to limit the thread affinity):

--master-lcore 0 --lcores (0,19)@(19,1,2,3)


If cpusets are used(and the calculated thread is outside the cpuset) eal fails
to start with the following output:

EAL: Failed to create thread for interrupt handling
EAL: FATAL: Cannot init interrupt-handling thread
EAL: Cannot init interrupt-handling thread
EAL: Error - exiting with code: 1
  Cause: Invalid EAL arguments: -1 - Unknown error -1

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