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IB/mlx5: Introduce DEVX

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Introduce DEVX to enable direct device commands in downstream patches
from this series.

In that mode of work the firmware manages the isolation between
processes' resources and as such a DEVX user id is created and assigned
to the given user context upon allocation request.

A capability check is done to make sure that this feature is really
supported by the firmware prior to creating the DEVX user id.

Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Yishai Hadas
2018-06-17 12:59:57 +03:00
committed by Jason Gunthorpe
parent 7dc08dcfc8
commit a8b92ca1b0
5 changed files with 96 additions and 3 deletions
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24
drivers/infiniband/hw/mlx5/main.c
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@@ -1650,8 +1650,8 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
if (err)
return ERR_PTR(err);
if (req.flags)
return ERR_PTR(-EINVAL);
if (req.flags & ~MLX5_IB_ALLOC_UCTX_DEVX)
return ERR_PTR(-EOPNOTSUPP);
if (req.comp_mask || req.reserved0 || req.reserved1 || req.reserved2)
return ERR_PTR(-EOPNOTSUPP);
@@ -1735,6 +1735,18 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
goto out_uars;
}
if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX) {
/* Block DEVX on Infiniband as of SELinux */
if (mlx5_ib_port_link_layer(ibdev, 1) != IB_LINK_LAYER_ETHERNET) {
err = -EPERM;
goto out_td;
}
err = mlx5_ib_devx_create(dev, context);
if (err)
goto out_td;
}
INIT_LIST_HEAD(&context->vma_private_list);
mutex_init(&context->vma_private_list_mutex);
INIT_LIST_HEAD(&context->db_page_list);
@@ -1795,7 +1807,7 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
err = ib_copy_to_udata(udata, &resp, resp.response_length);
if (err)
goto out_td;
goto out_mdev;
bfregi->ver = ver;
bfregi->num_low_latency_bfregs = req.num_low_latency_bfregs;
@@ -1805,6 +1817,9 @@ static struct ib_ucontext *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
return &context->ibucontext;
out_mdev:
if (req.flags & MLX5_IB_ALLOC_UCTX_DEVX)
mlx5_ib_devx_destroy(dev, context);
out_td:
if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))
mlx5_ib_dealloc_transport_domain(dev, context->tdn);
@@ -1830,6 +1845,9 @@ static int mlx5_ib_dealloc_ucontext(struct ib_ucontext *ibcontext)
struct mlx5_ib_dev *dev = to_mdev(ibcontext->device);
struct mlx5_bfreg_info *bfregi;
if (context->devx_uid)
mlx5_ib_devx_destroy(dev, context);
bfregi = &context->bfregi;
if (MLX5_CAP_GEN(dev->mdev, log_max_transport_domain))
mlx5_ib_dealloc_transport_domain(dev, context->tdn);