[spp] [PATCH 0/3] add document of pipe PMD

[Yasufumi Ogawa]

> This series of patches add document about pipe PMD.
Acked-by: Yasufumi Ogawa <yasufum.o at gmail.com>

> 
> Itsuro Oda (3):
>    docs: add CLI for pipe PMD
>    docs: add REST API for pipe PMD
>    docs: add document of pipe PMD usecase
> 
>   docs/guides/api_ref/spp_primary.rst           |  56 +-
>   docs/guides/commands/primary.rst              |  16 +
>   .../images/usecases/pipe_usecase_pipe.svg     | 611 ++++++++++++
>   .../images/usecases/pipe_usecase_sfc_nfv.svg  | 722 ++++++++++++++
>   .../images/usecases/pipe_usecase_sfc_vf.svg   | 933 ++++++++++++++++++
>   docs/guides/usecases/index.rst                |   1 +
>   docs/guides/usecases/pipe_pmd.rst             | 133 +++
>   7 files changed, 2464 insertions(+), 8 deletions(-)
>   create mode 100644 docs/guides/images/usecases/pipe_usecase_pipe.svg
>   create mode 100644 docs/guides/images/usecases/pipe_usecase_sfc_nfv.svg
>   create mode 100644 docs/guides/images/usecases/pipe_usecase_sfc_vf.svg
>   create mode 100644 docs/guides/usecases/pipe_pmd.rst
>