[RFC PATCH v2 0/4] liburing: add api for napi busy poll timeout

[Stefan Roesch <shr@devkernel.io>]

This adds two new api's to set and clear the napi busy poll timeout. The
two new functions are called:
- io_uring_register_busy_poll_timeout and
- io_uring_unregister_busy_poll_timeout.

The patch series also contains the documentation for the two new functions
and two test programs. The client program is called napi-busy-poll-client
and the server program napi-busy-poll-server. The client measures the
roundtrip times of requests.

There is also a kernel patch "io-uring: support napi busy poll" to enable
this feature on the kernel side.

Changes:
- V2:
  - Updated the liburing.map file for the two new functions.
    (added a 2.4 section)
  - Added a description of the new feature to the changelog file
  - Fixed the indentation of the longopts structure
  - Used defined exit constants
  - Fixed encodeUserData to support 32 bit builds


Signed-off-by: Stefan Roesch <shr@devkernel.io>

Stefan Roesch (4):
  liburing: add api to set napi busy poll timeout
  liburing: add documentation for new napi busy polling
  liburing: add test programs for napi busy poll
  liburing: update changelog with new feature

 CHANGELOG                       |   3 +
 man/io_uring_register_napi.3    |  35 +++
 man/io_uring_unregister_napi.3  |  26 ++
 src/include/liburing.h          |   4 +
 src/include/liburing/io_uring.h |   4 +
 src/liburing.map                |   8 +
 src/register.c                  |  15 ++
 test/Makefile                   |   2 +
 test/napi-busy-poll-client.c    | 422 ++++++++++++++++++++++++++++++++
 test/napi-busy-poll-server.c    | 372 ++++++++++++++++++++++++++++
 10 files changed, 891 insertions(+)
 create mode 100644 man/io_uring_register_napi.3
 create mode 100644 man/io_uring_unregister_napi.3
 create mode 100644 test/napi-busy-poll-client.c
 create mode 100644 test/napi-busy-poll-server.c


base-commit: 754bc068ec482c5338a07dd74b7d3892729bb847
-- 
2.30.2