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RDMA/mlx5: align MR mem allocation size to power-of-two

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The MR memory allocation requests extra bytes to guarantee that there
is enough space to find the memory aligned to MLX5_UMR_ALIGN.

For power-of-two sizes, the alignment can be guaranteed by kmalloc()
according to commit 59bb47985c ("mm, sl[aou]b: guarantee natural
alignment for kmalloc(power-of-two)").

So if target alignment is power-of-two and adding the extra bytes
crosses a power-of-two boundary, use the next power-of-two as the
allocation size.

Signed-off-by: Yuanyuan Zhong <yzhong@purestorage.com>
Link: https://lore.kernel.org/r/20230629213248.3184245-2-yzhong@purestorage.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Yuanyuan Zhong
2023-06-29 15:32:48 -06:00
committed by Leon Romanovsky
parent 06c2afb862
commit 52b4bdd28c
1 changed files with 5 additions and 0 deletions
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5
drivers/infiniband/hw/mlx5/mr.c
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@@ -1766,6 +1766,11 @@ mlx5_alloc_priv_descs(struct ib_device *device,
int ret;
add_size = max_t(int, MLX5_UMR_ALIGN - ARCH_KMALLOC_MINALIGN, 0);
if (is_power_of_2(MLX5_UMR_ALIGN) && add_size) {
int end = max_t(int, MLX5_UMR_ALIGN, roundup_pow_of_two(size));
add_size = min_t(int, end - size, add_size);
}
mr->descs_alloc = kzalloc(size + add_size, GFP_KERNEL);
if (!mr->descs_alloc)