[RFC 0/7] 64-bit data integrity field support

[Keith Busch <kbusch@kernel.org>]

The NVM Express protocol added enhancements to the data integrity field
formats beyond the T10 defined protection information. A detailed
description of the new formats can be found in the NVMe's NVM Command
Set Specification, section 5.2, available at:

  https://nvmexpress.org/wp-content/uploads/NVM-Command-Set-Specification-1.0b-2021.12.18-Ratified.pdf

This series implements one possible new format: the CRC64 guard with
48-bit reference tags. This does not add support for the variable
"storage tag" field.

The NVMe CRC64 parameters (from Rocksoft) were not implemented in the
kernel, so a software implementation is included in this series based on
the generated table. This series does not include any possible hardware
excelleration (ex: x86's pclmulqdq), so it's not very high performant
right now.

Keith Busch (7):
  block: support pi with extended metadata
  nvme: allow integrity on extended metadata formats
  lib: add rocksoft model crc64
  lib: add crc64 tests
  asm-generic: introduce be48 unaligned accessors
  block: add pi for nvme enhanced integrity
  nvme: add support for enhanced metadata

 block/Kconfig                   |   1 +
 block/bio-integrity.c           |   1 +
 block/t10-pi.c                  | 198 +++++++++++++++++++++++++++++++-
 drivers/nvme/host/core.c        | 167 ++++++++++++++++++++++-----
 drivers/nvme/host/nvme.h        |   1 +
 include/asm-generic/unaligned.h |  26 +++++
 include/linux/blk-integrity.h   |   1 +
 include/linux/crc64.h           |   2 +
 include/linux/nvme.h            |  53 ++++++++-
 include/linux/t10-pi.h          |  20 ++++
 lib/Kconfig.debug               |   3 +
 lib/Makefile                    |   1 +
 lib/crc64.c                     |  79 +++++++++++++
 lib/gen_crc64table.c            |  33 ++++--
 lib/test_crc64.c                |  68 +++++++++++
 15 files changed, 608 insertions(+), 46 deletions(-)
 create mode 100644 lib/test_crc64.c

-- 
2.25.4