[dpdk-dev] [PATCH v3 0/7] service cores: cover letter

Harry van Haaren harry.van.haaren at intel.com
Sun Jul 2 23:35:07 CEST 2017

This patchset introduces service cores to DPDK. A service core
is an lcore that performs functions to abstract away details of
differences in environment of the application.

An example is using the eventdev API, where either a software or hardware
PMD performs scheduling. In the case of the software PMD an lcore is
required to perform scheduling, which means application logic would have
to be aware of the PMD running under the API. To abstract away the
differences in HW / SW PMDs, service cores can run the SW PMD service
without application logic specifying the exact cores to use. Note that
eventdev is only one API that benefits; timers, interrupts handling,
statistics and monitoring, and a range of other infrastructure that
requires a slice of CPU time may all benefit from service cores.

The application is not obliged to manually use the service cores API,
however if an application wishes to use the service cores API for fine
grained control over how the services are run, this is possible. Deciding
between a performance threading-profile and scaled-down profile can be
achieved by advanced usage of service cores and setting the lcore mappings.

Finally, the last patch introduces how a PMD can register a service to run
a function. This is then available (along with any other registered services)
to be run by the service cores.

Regards, -Harry

- Added docs
- Added release notes
- Updated maintainers file
- Compile checks with devtools/test-build.sh
- Validated patches apply to latest dpdk/master
- Based on discussion, rte_service_iterate() is *not* included,
  but could be adding at a later date if use-cases require it.
- Future work includes enabling the eventdev_pipeline sample app, but there
  is still some churn there to enable both HW/SW PMDs seamlessly. Once sample
  app is enabled a service core walk-through with that sample app can be added
  to the docs, to provide a tutorial on service-core usage.

Harry van Haaren (7):
  service cores: header and implementation
  service cores: EAL init changes
  service cores: coremask parsing
  service cores: add unit tests
  service cores: enable event/sw with service
  maintainers: claim service cores
  doc: add service cores to doc and release notes

 MAINTAINERS                                        |   6 +
 doc/api/doxy-api-index.md                          |   1 +
 doc/guides/eventdevs/sw.rst                        |   4 +-
 doc/guides/prog_guide/index.rst                    |   1 +
 doc/guides/prog_guide/service_cores.rst            |  81 +++
 doc/guides/rel_notes/release_17_08.rst             |   8 +
 drivers/event/sw/sw_evdev.c                        |  32 +
 drivers/event/sw/sw_evdev.h                        |   3 +
 lib/librte_eal/bsdapp/eal/Makefile                 |   1 +
 lib/librte_eal/bsdapp/eal/eal.c                    |  22 +
 lib/librte_eal/bsdapp/eal/rte_eal_version.map      |  28 +
 lib/librte_eal/common/Makefile                     |   1 +
 lib/librte_eal/common/eal_common_lcore.c           |   1 +
 lib/librte_eal/common/eal_common_options.c         |  77 +++
 lib/librte_eal/common/include/rte_eal.h            |   4 +
 lib/librte_eal/common/include/rte_lcore.h          |   3 +-
 lib/librte_eal/common/include/rte_service.h        | 298 +++++++++
 .../common/include/rte_service_private.h           | 118 ++++
 lib/librte_eal/common/rte_service.c                | 671 +++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/Makefile               |   1 +
 lib/librte_eal/linuxapp/eal/eal.c                  |  23 +
 lib/librte_eal/linuxapp/eal/eal_thread.c           |   9 +-
 lib/librte_eal/linuxapp/eal/rte_eal_version.map    |  29 +
 test/test/Makefile                                 |   2 +
 test/test/test_service_cores.c                     | 496 +++++++++++++++
 25 files changed, 1917 insertions(+), 3 deletions(-)
 create mode 100644 doc/guides/prog_guide/service_cores.rst
 create mode 100644 lib/librte_eal/common/include/rte_service.h
 create mode 100644 lib/librte_eal/common/include/rte_service_private.h
 create mode 100644 lib/librte_eal/common/rte_service.c
 create mode 100644 test/test/test_service_cores.c


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