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RDMA/core: Add UVERBS_ATTR_RAW_FD

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This uses the same passing protocol as UVERBS_ATTR_FD (eg len = 0 data_s64
= fd), except that the FD is not required to be a uverbs object and the
core code does not covert the FD to an object handle automatically.

Access to the int fd is provided by uverbs_get_raw_fd().

Link: https://lore.kernel.org/r/2-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 11:20:54 -03:00
parent 4bf207d7a5
commit 015bda8abd
2 changed files with 21 additions and 0 deletions
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8
drivers/infiniband/core/uverbs_ioctl.c
View File

@ -337,6 +337,14 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
break;
case UVERBS_ATTR_TYPE_RAW_FD:
if (uattr->attr_data.reserved || uattr->len != 0 ||
uattr->data_s64 < INT_MIN || uattr->data_s64 > INT_MAX)
return -EINVAL;
/* _uverbs_get_const_signed() is the accessor */
e->ptr_attr.data = uattr->data_s64;
break;
case UVERBS_ATTR_TYPE_IDRS_ARRAY:
return uverbs_process_idrs_array(pbundle, attr_uapi,
&e->objs_arr_attr, uattr,

13
include/rdma/uverbs_ioctl.h
View File

@ -24,6 +24,7 @@ enum uverbs_attr_type {
UVERBS_ATTR_TYPE_PTR_OUT,
UVERBS_ATTR_TYPE_IDR,
UVERBS_ATTR_TYPE_FD,
UVERBS_ATTR_TYPE_RAW_FD,
UVERBS_ATTR_TYPE_ENUM_IN,
UVERBS_ATTR_TYPE_IDRS_ARRAY,
};
@ -521,6 +522,11 @@ struct uapi_definition {
.u.obj.access = _access, \
__VA_ARGS__ } })
#define UVERBS_ATTR_RAW_FD(_attr_id, ...) \
(&(const struct uverbs_attr_def){ \
.id = (_attr_id), \
.attr = { .type = UVERBS_ATTR_TYPE_RAW_FD, __VA_ARGS__ } })
#define UVERBS_ATTR_PTR_IN(_attr_id, _type, ...) \
(&(const struct uverbs_attr_def){ \
.id = _attr_id, \
@ -999,4 +1005,11 @@ _uverbs_get_const_unsigned(u64 *to,
uverbs_get_const_default_unsigned(_to, _attrs_bundle, _idx, \
_default))
static inline int
uverbs_get_raw_fd(int *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx)
{
return uverbs_get_const_signed(to, attrs_bundle, idx);
}
#endif