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RDMA/mlx5: Add support for dmabuf to devx umem

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This is modeled after the similar EFA enablement in commit
66f4817b57 ("RDMA/efa: Add support for dmabuf memory regions").

Like EFA there is no support for revocation so we simply call the
ib_umem_dmabuf_get_pinned() to obtain a umem instead of the normal
ib_umem_get().  Everything else stays the same.

Link: https://lore.kernel.org/r/3-v1-bd147097458e+ede-umem_dmabuf_jgg@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2022-09-01 11:20:55 -03:00
parent 015bda8abd
commit 9af859c58d
2 changed files with 22 additions and 3 deletions
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24
drivers/infiniband/hw/mlx5/devx.c
View file

@ -2183,9 +2183,25 @@ static int devx_umem_get(struct mlx5_ib_dev *dev, struct ib_ucontext *ucontext,
if (err)
return err;
obj->umem = ib_umem_get(&dev->ib_dev, addr, size, access);
if (IS_ERR(obj->umem))
return PTR_ERR(obj->umem);
if (uverbs_attr_is_valid(attrs, MLX5_IB_ATTR_DEVX_UMEM_REG_DMABUF_FD)) {
struct ib_umem_dmabuf *umem_dmabuf;
int dmabuf_fd;
err = uverbs_get_raw_fd(&dmabuf_fd, attrs,
MLX5_IB_ATTR_DEVX_UMEM_REG_DMABUF_FD);
if (err)
return -EFAULT;
umem_dmabuf = ib_umem_dmabuf_get_pinned(
&dev->ib_dev, addr, size, dmabuf_fd, access);
if (IS_ERR(umem_dmabuf))
return PTR_ERR(umem_dmabuf);
obj->umem = &umem_dmabuf->umem;
} else {
obj->umem = ib_umem_get(&dev->ib_dev, addr, size, access);
if (IS_ERR(obj->umem))
return PTR_ERR(obj->umem);
}
return 0;
}
@ -2835,6 +2851,8 @@ DECLARE_UVERBS_NAMED_METHOD(
UVERBS_ATTR_PTR_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_LEN,
UVERBS_ATTR_TYPE(u64),
UA_MANDATORY),
UVERBS_ATTR_RAW_FD(MLX5_IB_ATTR_DEVX_UMEM_REG_DMABUF_FD,
UA_OPTIONAL),
UVERBS_ATTR_FLAGS_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
enum ib_access_flags),
UVERBS_ATTR_CONST_IN(MLX5_IB_ATTR_DEVX_UMEM_REG_PGSZ_BITMAP,

1
include/uapi/rdma/mlx5_user_ioctl_cmds.h
View file

@ -174,6 +174,7 @@ enum mlx5_ib_devx_umem_reg_attrs {
MLX5_IB_ATTR_DEVX_UMEM_REG_ACCESS,
MLX5_IB_ATTR_DEVX_UMEM_REG_OUT_ID,
MLX5_IB_ATTR_DEVX_UMEM_REG_PGSZ_BITMAP,
MLX5_IB_ATTR_DEVX_UMEM_REG_DMABUF_FD,
};
enum mlx5_ib_devx_umem_dereg_attrs {