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| author | Jason Gunthorpe <jgg@nvidia.com> | 2020-09-04 19:41:42 -0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2020-09-09 15:33:17 -0300 |
| commit | a40c20dabdf9045270767c75918feb67f0727c89 (patch) | |
| tree | 18d950f161029c7eb29da0f5a31c9d89da64b71d /tools/perf/scripts/python | |
| parent | 71ff3f6268644783d556fab10066f1027030135f (diff) | |
| download | kernel-a40c20dabdf9045270767c75918feb67f0727c89.tar.gz | |
RDMA/umem: Fix ib_umem_find_best_pgsz() for mappings that cross a page boundary
It is possible for a single SGL to span an aligned boundary, eg if the SGL
is
61440 -> 90112
Then the length is 28672, which currently limits the block size to
32k. With a 32k page size the two covering blocks will be:
32768->65536 and 65536->98304
However, the correct answer is a 128K block size which will span the whole
28672 bytes in a single block.
Instead of limiting based on length figure out which high IOVA bits don't
change between the start and end addresses. That is the highest useful
page size.
Fixes: 4a35339958f1 ("RDMA/umem: Add API to find best driver supported page size in an MR")
Link: https://lore.kernel.org/r/1-v2-270386b7e60b+28f4-umem_1_jgg@nvidia.com
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions