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RDMA/mlx5: Fix page size bitmap calculation for KSM mode

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When using KSM (Key Scatter-gather Memory) access mode, the HW requires
the IOVA to be aligned to the selected page size.
Without this alignment, the HW may not function correctly.

Currently, mlx5_umem_mkc_find_best_pgsz() does not filter out page sizes
that would result in misaligned IOVAs for KSM mode. This can lead to
selecting page sizes that are incompatible with the given IOVA.

Fix this by filtering the page size bitmap when in KSM mode, keeping
only page sizes to which the IOVA is aligned to.

Fixes: fcfb03597b ("RDMA/mlx5: Align mkc page size capability check to PRM")
Signed-off-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/20250824144839.154717-1-edwards@nvidia.com
Reviewed-by: Michael Guralnik <michaelgur@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Edward Srouji
2025-08-24 17:48:39 +03:00
committed by Leon Romanovsky
parent aae757ec20
commit 372fdb5c75
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/mlx5/mlx5_ib.h
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@@ -1805,6 +1805,10 @@ mlx5_umem_mkc_find_best_pgsz(struct mlx5_ib_dev *dev, struct ib_umem *umem,
bitmap = GENMASK_ULL(max_log_entity_size_cap, min_log_entity_size_cap);
/* In KSM mode HW requires IOVA and mkey's page size to be aligned */
if (access_mode == MLX5_MKC_ACCESS_MODE_KSM && iova)
bitmap &= GENMASK_ULL(__ffs64(iova), 0);
return ib_umem_find_best_pgsz(umem, bitmap, iova);
}