[PATCHv3 0/3]

[Keith Busch <kbusch@meta.com>]

From: Keith Busch <kbusch@kernel.org>

Previous version:

  https://lore.kernel.org/io-uring/20250904192716.3064736-1-kbusch@meta.com/

The CQ supports mixed size entries, so why not for SQ's too? There are
use cases that currently allocate different queues just to keep these
things separated, but we can efficiently handle both cases in a single
ring.

Changes since v2:

 - Define 128B opcodes to be used on mixed SQs. This is done instead of
   using the last SQE flags bit to generically identify a command as
   such. The new opcodes are valid only on a mixed SQ.

 - Fixed up the accounting of sqes left to dispatch. The big sqes on a
   mixed sq count for two entries, so previously would have fetched too
   many.

 - liburing won't bother submitting the nop-skip for the wrap-around
   condition if there are not enoungh free entries for the big-sqe.

kernel:

Keith Busch (1):
  io_uring: add support for IORING_SETUP_SQE_MIXED

 include/uapi/linux/io_uring.h |  8 ++++++++
 io_uring/fdinfo.c             | 34 +++++++++++++++++++++++++++-------
 io_uring/io_uring.c           | 27 +++++++++++++++++++++++----
 io_uring/io_uring.h           |  8 +++++---
 io_uring/opdef.c              | 26 ++++++++++++++++++++++++++
 io_uring/opdef.h              |  2 ++
 io_uring/register.c           |  2 +-
 io_uring/uring_cmd.c          | 12 ++++++++++--
 io_uring/uring_cmd.h          |  1 +
 9 files changed, 103 insertions(+), 17 deletions(-)

liburing:

Keith Busch (3):
  Add support IORING_SETUP_SQE_MIXED
  Add nop testing for IORING_SETUP_SQE_MIXED
  Add mixed sqe test for uring commands

 src/include/liburing.h          |  50 +++++++++++
 src/include/liburing/io_uring.h |  11 +++
 test/Makefile                   |   3 +
 test/sqe-mixed-bad-wrap.c       |  89 ++++++++++++++++++++
 test/sqe-mixed-nop.c            |  82 ++++++++++++++++++
 test/sqe-mixed-uring_cmd.c      | 142 ++++++++++++++++++++++++++++++++
 6 files changed, 377 insertions(+)
 create mode 100644 test/sqe-mixed-bad-wrap.c
 create mode 100644 test/sqe-mixed-nop.c
 create mode 100644 test/sqe-mixed-uring_cmd.c

-- 
2.47.3