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| author |   Jason Gunthorpe <jgg@mellanox.com> | 2018-11-12 22:59:52 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-11-22 11:57:32 -0700 |
| commit | 6829c1c2b371674a05562a39d608b5cf48351bea (patch) | |
| tree | 637fbc743a57f244ff178cc11dc790175dd3f40a /include/rdma | |
| parent | RDMA/uverbs: Factor out the add/get pattern into a helper (diff) | |
| download | linux-dev-6829c1c2b371674a05562a39d608b5cf48351bea.tar.xz linux-dev-6829c1c2b371674a05562a39d608b5cf48351bea.zip | |
RDMA/uverbs: Add helpers to mark uapi functions as unsupported
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>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/uverbs_ioctl.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h index 9fa0cca45783..130f05e1a53b 100644 --- a/include/rdma/uverbs_ioctl.h +++ b/include/rdma/uverbs_ioctl.h @@ -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) \ { \ |