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| author |   Jason Gunthorpe <jgg@mellanox.com> | 2019-10-09 13:09:23 -0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-10-28 16:41:13 -0300 |
| commit | 806b101b2bfa800a9c779336b750bee39c7fb3b4 (patch) | |
| tree | d92097667a5f091dc25780f8c863cd3e28f72ed9 /drivers/infiniband/hw/mlx5/mlx5_ib.h | |
| parent | RDMA/mlx5: Split sig_err MR data into its own xarray (diff) | |
| download | linux-dev-806b101b2bfa800a9c779336b750bee39c7fb3b4.tar.xz linux-dev-806b101b2bfa800a9c779336b750bee39c7fb3b4.zip | |
RDMA/mlx5: Use a dedicated mkey xarray for ODP
There is a per device xarray storing mkeys that is used to store every
mkey in the system. However, this xarray is now only read by ODP for
certain ODP designated MRs (ODP, implicit ODP, MW, DEVX_INDIRECT).
Create an xarray only for use by ODP, that only contains ODP related
MKeys. This xarray is protected by SRCU and all erases are protected by a
synchronize.
This improves performance:
- All MRs in the odp_mkeys xarray are ODP MRs, so some tests for is_odp()
can be deleted. The xarray will also consume fewer nodes.
- normal MR's are never mixed with ODP MRs in a SRCU data structure so
performance sucking synchronize_srcu() on every MR destruction is not
needed.
- No smp_load_acquire(live) and xa_load() double barrier on read
Due to the SRCU locking scheme care must be taken with the placement of
the xa_store(). Once it completes the MR is immediately visible to other
threads and only through a xa_erase() & synchronize_srcu() cycle could it
be destroyed.
Link: https://lore.kernel.org/r/20191009160934.3143-4-jgg@ziepe.ca
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/hw/mlx5/mlx5_ib.h')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/mlx5_ib.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h index f4ce58354544..2cf91db6a36f 100644 --- a/drivers/infiniband/hw/mlx5/mlx5_ib.h +++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h @@ -606,7 +606,6 @@ struct mlx5_ib_mr { struct mlx5_ib_dev *dev; u32 out[MLX5_ST_SZ_DW(create_mkey_out)]; struct mlx5_core_sig_ctx *sig; - unsigned int live; void *descs_alloc; int access_flags; /* Needed for rereg MR */ @@ -975,7 +974,9 @@ struct mlx5_ib_dev { * Sleepable RCU that prevents destruction of MRs while they are still * being used by a page fault handler. */ - struct srcu_struct mr_srcu; + struct srcu_struct odp_srcu; + struct xarray odp_mkeys; + u32 null_mkey; struct mlx5_ib_flow_db *flow_db; /* protect resources needed as part of reset flow */ |