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| author | Yishai Hadas <[email protected]> | 2025-07-17 12:17:32 +0000 |
|---|---|---|
| committer | Leon Romanovsky <[email protected]> | 2025-07-23 05:42:11 +0000 |
| commit | e1bed9a94da86a7c01b985c2e9a030207269cbc7 (patch) | |
| tree | ac27a14a6c4428d82cdcf95394b987eec242e462 /drivers/infiniband/hw/mlx5/devx.c | |
| parent | IB: Extend UVERBS_METHOD_REG_MR to get DMAH (diff) | |
| download | kernel-e1bed9a94da86a7c01b985c2e9a030207269cbc7.tar.gz kernel-e1bed9a94da86a7c01b985c2e9a030207269cbc7.zip | |
RDMA/mlx5: Add DMAH support for reg_user_mr/reg_user_dmabuf_mr
As part of this enhancement, allow the creation of an MKEY associated
with a DMA handle.
Additional notes:
MKEYs with TPH (i.e. TLP Processing Hints) attributes are currently not
UMR-capable unless explicitly enabled by firmware or hardware.
Therefore, to maintain such MKEYs in the MR cache, the TPH fields have
been added to the rb_key structure, with a dedicated hash bucket.
The ability to bypass the kernel verbs flow and create an MKEY with TPH
attributes using DEVX has been restricted. TPH must follow the standard
InfiniBand flow, where a DMAH is created with the appropriate security
checks and management mechanisms in place.
DMA handles are currently not supported in conjunction with On-Demand
Paging (ODP).
Re-registration of memory regions originally created with TPH attributes
is currently not supported.
Signed-off-by: Yishai Hadas <[email protected]>
Reviewed-by: Edward Srouji <[email protected]>
Link: https://patch.msgid.link/1c485651cf8417694ddebb80446c5093d5a791a9.1752752567.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <[email protected]>
Diffstat (limited to 'drivers/infiniband/hw/mlx5/devx.c')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/devx.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx5/devx.c b/drivers/infiniband/hw/mlx5/devx.c index c03fe5414b9a..c6ced06111dd 100644 --- a/drivers/infiniband/hw/mlx5/devx.c +++ b/drivers/infiniband/hw/mlx5/devx.c @@ -1393,6 +1393,10 @@ static int devx_handle_mkey_create(struct mlx5_ib_dev *dev, } MLX5_SET(create_mkey_in, in, mkey_umem_valid, 1); + /* TPH is not allowed to bypass the regular kernel's verbs flow */ + MLX5_SET(mkc, mkc, pcie_tph_en, 0); + MLX5_SET(mkc, mkc, pcie_tph_steering_tag_index, + MLX5_MKC_PCIE_TPH_NO_STEERING_TAG_INDEX); return 0; } |