This patchset adds a new I/O engine (io_uring_cmd), which enables support for io_uring passthrough commands. This work is based on upcoming 5.19 kernel. https://github.com/torvalds/linux/commits/master This engine will use most of the existing helpers from io_uring. The I/O preparation, completion, file open, file close and post init paths are going to differ and hence io_uring_cmd will have its own helpers for them. The current uring passthrough support is present only with nvme-ns character device (/dev/ngXnY). This includes both conventional as well as ZNS devices. Add a new io_uring_cmd engine specific option: * cmd_type cmd_type provides the flexibility to support different types of passthrough commands in future. To enable support for nvme passthrough commands, we are adding nvme.c and nvme.h files. These will have the necessary NVMe specification data structures, opcodes and helper functions for sending admin and I/O passthrough commands. O_DIRECT flag support is not present with nvme-ns charatcer devices, hence zbd will check for them only if fio filetype is a block device. The t/zbd/test-zbd-support test case #1 is now appropriately updated to run only for block device. Changes from v2 to v3: - I/O command formation cleanup and example config file changes as per the review comments from Vincent and Jens. - Addressed review comments from Kanchan with regards to io_uring_cmd options. - test case 1 skip only for character device fixed, as reported by Shin'ichiro. Ankit Kumar (5): configure: check nvme uring command support nvme: add nvme opcodes, structures and helper functions docs: document options for io_uring_cmd I/O engine zbd: Check for direct flag only if its block device engines/io_uring: Enable zone device support for io_uring_cmd I/O engine Anuj Gupta (4): io_uring.h: add IORING_SETUP_SQE128 and IORING_SETUP_CQE32 init: return error incase an invalid value is passed as option engines/io_uring: add new I/O engine for uring passthrough support examples: add 2 example job file for io_uring_cmd engine HOWTO.rst | 41 +++- Makefile | 4 +- configure | 21 +++ engines/io_uring.c | 350 ++++++++++++++++++++++++++++++++++- engines/nvme.c | 345 ++++++++++++++++++++++++++++++++++ engines/nvme.h | 214 +++++++++++++++++++++ examples/uring-cmd-ng.fio | 25 +++ examples/uring-cmd-zoned.fio | 31 ++++ file.h | 12 +- fio.1 | 33 +++- init.c | 9 + os/linux/io_uring.h | 45 ++++- t/zbd/test-zbd-support | 11 +- zbd.c | 4 +- 14 files changed, 1113 insertions(+), 32 deletions(-) create mode 100644 engines/nvme.c create mode 100644 engines/nvme.h create mode 100644 examples/uring-cmd-ng.fio create mode 100644 examples/uring-cmd-zoned.fio base-commit: e1aeff3ac96a51128b0493377f405e38bdc83500 -- 2.17.1
