[RFC PATCH v3 0/3] Async nvme passthrough over io_uring

[Kanchan Joshi <joshi.k@samsung.com>]

This series adds async passthrough capability for nvme block-dev over
iouring_cmd. The patches are on top of Jens uring-cmd branch:
https://git.kernel.dk/cgit/linux-block/log/?h=io_uring-fops.v3

Application is expected to allocate passthrough command structure, set
it up traditionally, and pass its address via "block_uring_cmd->addr".
On completion, CQE is posted with completion-status after any ioctl
specific buffer/field update.

Changes from v2:
1. Rebase against latest uring-cmd branch of Jens
2. Remove per-io nvme_command allocation
3. Disallow passthrough commands with non-zero command effects

Change from v1:
1. Rewire the work on top of Jens uring-cmd interface
2. Support only passthrough, and not other nvme ioctls

Kanchan Joshi (3):
  io_uring: add helper for uring_cmd completion in submitter-task
  nvme: keep nvme_command instead of pointer to it
  nvme: wire up support for async passthrough

 drivers/nvme/host/core.c     | 186 ++++++++++++++++++++++++++++++-----
 drivers/nvme/host/fabrics.c  |   4 +-
 drivers/nvme/host/lightnvm.c |  16 +--
 drivers/nvme/host/nvme.h     |   5 +-
 drivers/nvme/host/pci.c      |   1 +
 fs/io_uring.c                |  36 ++++++-
 include/linux/io_uring.h     |   8 ++
 7 files changed, 213 insertions(+), 43 deletions(-)

-- 
2.25.1