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[0/7] Register external threads as lcore

Message ID 20200610144506.30505-1-david.marchand@redhat.com (mailing list archive)
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David Marchand June 10, 2020, 2:44 p.m. UTC 
  OVS and some other applications have been hacking into DPDK internals to
fake EAL threads and avoid performance penalty of only having non-EAL
threads.

This series proposes to add a new type of lcores and maps those external
threads to such lcores.
Those threads won't run the DPDK eal mainloop and as a consequence part of
the EAL threads API cannot work.

Having new lcores appearing during the process lifetime is not expected
by some DPDK components. This is addressed by notifying of such lcore
hotplug.

This patchset has still some more work (like refusing new lcore type in
incompatible EAL threads API, updating the documentation and adding unit
tests) but I am sending it anyway as I would like to get this in for
20.08.

For the interested parties, I have a patch [1] against dpdk-latest OVS
branch that makes use of this series.

1: https://github.com/david-marchand/ovs/commit/dpdk-latest-external-lcores