[v4,0/4] regex/mlx5: support scattered mbuf

  The scattered mbuf was not supported in mlx5 RegEx driver. This
patch set adds the support of scattered mbuf by UMR WQE.

UMR(User-Mode Memory Registration) WQE can present data buffers
scattered within multiple mbufs with single indirect mkey. Take
advantage of the UMR WQE, scattered mbuf in one operation can be
presented to an indirect mkey. The RegEx which only accepts one
mkey can now process the whole scattered mbuf in one operation.

The maximum scattered mbuf can be supported in one UMR WQE is now
defined as 64. The mbufs from multiple operations can be combined
into one UMR WQE as well if there is enough space in the KLM array,
since the operations can address their own mbuf's content by the
mkey's address and length. However, one operation's scattered mbuf's
can't be placed in two different UMR WQE's KLM array, if the UMR
WQE's KLM does not has enough free space for one operation, the
extra UMR WQE will be engaged.

In case the UMR WQE's indirect mkey will be over wrapped by the SQ's
WQE move, the mkey's index used by the UMR WQE should be the index
of last the RegEX WQE in the operations. As one operation consumes
one WQE set, build the RegEx WQE by reverse helps address the mkey
more efficiently. Once the operations in one burst consumes multiple
mkeys, when the mkey KLM array is full, the reverse WQE set index
will always be the last of the new mkey's for the new UMR WQE.

In GGA mode, the SQ WQE's memory layout becomes UMR/NOP and RegEx
WQE by interleave. The UMR and RegEx WQE can be called as WQE set.
The SQ's pi and ci will also be increased as WQE set not as WQE.

For operations don't have scattered mbuf, uses the mbuf's mkey directly,
the WQE set combination is NOP + RegEx.
For operations have scattered mubf but share the UMR WQE with others,
the WQE set combination is NOP + RegEx.
For operations complete the UMR WQE, the WQE set combination is UMR +
RegEx.

v4:
1. git log improvement.

v3:
1. Move testregex.rst change to the correct commit.
2. Code rebase to the latest version.

v2:
1. Check mbuf multiple seg by nb_segs.
2. Add ops prefetch.
3. Allocate ops and mbuf memory together in test application.
4. Fix ci and pi in correct issue.

John Hurley (1):
  regex/mlx5: prevent wrong calculation of free sqs in umr mode

Suanming Mou (3):
  common/mlx5: add user memory registration bits
  regex/mlx5: add data path scattered mbuf process
  app/test-regex: support scattered mbuf input

 app/test-regex/main.c                    | 134 ++++++--
 doc/guides/regexdevs/mlx5.rst            |   5 +
 doc/guides/rel_notes/release_21_05.rst   |   4 +
 doc/guides/tools/testregex.rst           |   3 +
 drivers/common/mlx5/linux/meson.build    |   2 +
 drivers/common/mlx5/mlx5_devx_cmds.c     |   5 +
 drivers/common/mlx5/mlx5_devx_cmds.h     |   3 +
 drivers/regex/mlx5/mlx5_regex.c          |   9 +
 drivers/regex/mlx5/mlx5_regex.h          |  26 +-
 drivers/regex/mlx5/mlx5_regex_control.c  |  43 ++-
 drivers/regex/mlx5/mlx5_regex_fastpath.c | 380 +++++++++++++++++++++--
 11 files changed, 531 insertions(+), 83 deletions(-)