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RDMA/uverbs: Add helpers to mark uapi functions as unsupported

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We have many cases where parts of the uapi are not supported in a driver,
needs a certain protocol, or whatever. It is best to reflect this directly
into the struct uverbs_api when it is built so that everything is simply
blocked off, and future introspection can report a proper supported list.

This is done by adding some additional helpers to the definition list
language that disable objects based on a 'supported' call back, and a
helper that disables based on a NULL struct ib_device function pointer.

Disablement is global. For instance, if a driver disables an object then
everything connected to that object is removed, including core methods.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
This commit is contained in:
Jason Gunthorpe
2018-11-12 22:59:52 +02:00
parent c27f6aa8c9
commit 6829c1c2b3
4 changed files with 196 additions and 18 deletions
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31
include/rdma/uverbs_ioctl.h
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@@ -300,10 +300,17 @@ enum uapi_definition_kind {
UAPI_DEF_END = 0,
UAPI_DEF_CHAIN_OBJ_TREE,
UAPI_DEF_CHAIN,
UAPI_DEF_IS_SUPPORTED_FUNC,
UAPI_DEF_IS_SUPPORTED_DEV_FN,
};
enum uapi_definition_scope {
UAPI_SCOPE_OBJECT = 1,
};
struct uapi_definition {
u8 kind;
u8 scope;
union {
struct {
u16 object_id;
@@ -311,11 +318,35 @@ struct uapi_definition {
};
union {
bool (*func_is_supported)(struct ib_device *device);
const struct uapi_definition *chain;
const struct uverbs_object_def *chain_obj_tree;
size_t needs_fn_offset;
};
};
/*
* Object is only supported if the function pointer named ibdev_fn in struct
* ib_device is not NULL.
*/
#define UAPI_DEF_OBJ_NEEDS_FN(ibdev_fn) \
{ \
.kind = UAPI_DEF_IS_SUPPORTED_DEV_FN, \
.scope = UAPI_SCOPE_OBJECT, \
.needs_fn_offset = \
offsetof(struct ib_device, ibdev_fn) + \
BUILD_BUG_ON_ZERO( \
sizeof(((struct ib_device *)0)->ibdev_fn) != \
sizeof(void *)), \
}
/* Call a function to determine if the entire object is supported or not */
#define UAPI_DEF_IS_OBJ_SUPPORTED(_func) \
{ \
.kind = UAPI_DEF_IS_SUPPORTED_FUNC, \
.scope = UAPI_SCOPE_OBJECT, .func_is_supported = _func, \
}
/* Include another struct uapi_definition in this one */
#define UAPI_DEF_CHAIN(_def_var) \
{ \