[PATCH v3 0/3] io_uring passthru: set result on blk-mq request completion

[Caleb Sander Mateos <csander@purestorage.com>]

io_uring NVMe passthru currently receives the NVMe status and result in
the blk-mq request completion callback nvme_uring_cmd_end_io() but
doesn't post the io_uring CQE until the io_uring task work callback
nvme_uring_task_cb(). The status and result must be plumbed through
struct nvme_uring_cmd_pdu, taking up 16 bytes of the 32 available.

Store the status and result on the io_uring request in
nvme_uring_cmd_end_io() instead of nvme_uring_task_cb() so it doesn't
need to be passed through struct nvme_uring_cmd_pdu.

v3:
- Inline io_uring_cmd_set_res*() (Ming, Jens)
- Document that io_uring_cmd_set_res*() must be called before
  __io_uring_cmd_done() (Joanne)
- Add Reviewed-by tag (Joanne)

v2: https://lore.kernel.org/io-uring/20260902225708.2379840-1-csander@purestorage.com/
- Keep io_uring_cmd_done{,32}() wrappers to reduce changes in uring_cmd
  implementations (Joanne)

v1: https://lore.kernel.org/io-uring/20260827185722.3234622-1-csander@purestorage.com/

Caleb Sander Mateos (3):
  io_uring: move req_set_*() to public header
  io_uring/cmd: split io_uring_cmd_set_res() from io_uring_cmd_done()
  nvme/ioctl: call io_uring_cmd_set_res32() in ->end_io()

 drivers/nvme/host/ioctl.c    | 19 +++++++++----------
 include/linux/io_uring.h     | 32 ++++++++++++++++++++++++++++++++
 include/linux/io_uring/cmd.h | 34 ++++++++++++++++++++++++++++------
 io_uring/io_uring.h          | 31 -------------------------------
 io_uring/uring_cmd.c         | 19 +------------------
 5 files changed, 70 insertions(+), 65 deletions(-)

-- 
2.55.0