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authorJason Gunthorpe <jgg@mellanox.com>2018-11-12 22:59:52 +0200
committerJason Gunthorpe <jgg@mellanox.com>2018-11-22 11:57:32 -0700
commit6829c1c2b371674a05562a39d608b5cf48351bea (patch)
tree637fbc743a57f244ff178cc11dc790175dd3f40a /include/rdma/uverbs_ioctl.h
parentc27f6aa8c9df7f3270d5f5f2957a2a024262eb99 (diff)
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/uverbs_ioctl.h')
-rw-r--r--include/rdma/uverbs_ioctl.h31
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) \
{ \