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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/infiniband/core/rdma_core.h
View File

@ -121,6 +121,7 @@ void release_ufile_idr_uobject(struct ib_uverbs_file *ufile);
struct uverbs_api_object {
const struct uverbs_obj_type *type_attrs;
const struct uverbs_obj_type_class *type_class;
u8 disabled:1;
};
struct uverbs_api_ioctl_method {
@ -130,6 +131,7 @@ struct uverbs_api_ioctl_method {
u16 bundle_size;
u8 use_stack:1;
u8 driver_method:1;
u8 disabled:1;
u8 key_bitmap_len;
u8 destroy_bkey;
};
@ -138,7 +140,6 @@ struct uverbs_api_attr {
struct uverbs_attr_spec spec;
};
struct uverbs_api_object;
struct uverbs_api {
/* radix tree contains struct uverbs_api_* pointers */
struct radix_tree_root radix;
@ -152,8 +153,7 @@ uapi_get_object(struct uverbs_api *uapi, u16 object_id)
}
char *uapi_key_format(char *S, unsigned int key);
struct uverbs_api *uverbs_alloc_api(const struct uapi_definition *driver_def,
enum rdma_driver_id driver_id);
struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev);
void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev);
void uverbs_disassociate_api(struct uverbs_api *uapi);
void uverbs_destroy_api(struct uverbs_api *uapi);

2
drivers/infiniband/core/uverbs_main.c
View File

@ -1224,7 +1224,7 @@ static int ib_uverbs_create_uapi(struct ib_device *device,
{
struct uverbs_api *uapi;
uapi = uverbs_alloc_api(device->driver_def, device->driver_id);
uapi = uverbs_alloc_api(device);
if (IS_ERR(uapi))
return PTR_ERR(uapi);

175
drivers/infiniband/core/uverbs_uapi.c
View File

@ -167,11 +167,33 @@ static int uapi_merge_obj_tree(struct uverbs_api *uapi,
return 0;
}
static int uapi_merge_def(struct uverbs_api *uapi,
static int uapi_disable_elm(struct uverbs_api *uapi,
const struct uapi_definition *def,
u32 obj_key)
{
bool exists;
if (def->scope == UAPI_SCOPE_OBJECT) {
struct uverbs_api_object *obj_elm;
obj_elm = uapi_add_get_elm(
uapi, obj_key, sizeof(*obj_elm), &exists);
if (IS_ERR(obj_elm))
return PTR_ERR(obj_elm);
obj_elm->disabled = 1;
return 0;
}
WARN_ON(true);
return -EINVAL;
}
static int uapi_merge_def(struct uverbs_api *uapi, struct ib_device *ibdev,
const struct uapi_definition *def_list,
bool is_driver)
{
const struct uapi_definition *def = def_list;
u32 cur_obj_key = UVERBS_API_KEY_ERR;
int rc;
if (!def_list)
@ -180,7 +202,7 @@ static int uapi_merge_def(struct uverbs_api *uapi,
for (;; def++) {
switch ((enum uapi_definition_kind)def->kind) {
case UAPI_DEF_CHAIN:
rc = uapi_merge_def(uapi, def->chain, is_driver);
rc = uapi_merge_def(uapi, ibdev, def->chain, is_driver);
if (rc)
return rc;
continue;
@ -190,6 +212,7 @@ static int uapi_merge_def(struct uverbs_api *uapi,
def->chain_obj_tree->id))
return -EINVAL;
cur_obj_key = uapi_key_obj(def->object_start.object_id);
rc = uapi_merge_obj_tree(uapi, def->chain_obj_tree,
is_driver);
if (rc)
@ -198,6 +221,25 @@ static int uapi_merge_def(struct uverbs_api *uapi,
case UAPI_DEF_END:
return 0;
case UAPI_DEF_IS_SUPPORTED_DEV_FN: {
void **ibdev_fn = (void *)ibdev + def->needs_fn_offset;
if (*ibdev_fn)
continue;
rc = uapi_disable_elm(uapi, def, cur_obj_key);
if (rc)
return rc;
continue;
}
case UAPI_DEF_IS_SUPPORTED_FUNC:
if (def->func_is_supported(ibdev))
continue;
rc = uapi_disable_elm(uapi, def, cur_obj_key);
if (rc)
return rc;
continue;
}
WARN_ON(true);
return -EINVAL;
@ -286,18 +328,122 @@ static int uapi_finalize(struct uverbs_api *uapi)
return 0;
}
void uverbs_destroy_api(struct uverbs_api *uapi)
static void uapi_remove_range(struct uverbs_api *uapi, u32 start, u32 last)
{
struct radix_tree_iter iter;
void __rcu **slot;
if (!uapi)
return;
radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
radix_tree_for_each_slot (slot, &uapi->radix, &iter, start) {
if (iter.index > last)
return;
kfree(rcu_dereference_protected(*slot, true));
radix_tree_iter_delete(&uapi->radix, &iter, slot);
}
}
static void uapi_remove_object(struct uverbs_api *uapi, u32 obj_key)
{
uapi_remove_range(uapi, obj_key,
obj_key | UVERBS_API_METHOD_KEY_MASK |
UVERBS_API_ATTR_KEY_MASK);
}
static void uapi_remove_method(struct uverbs_api *uapi, u32 method_key)
{
uapi_remove_range(uapi, method_key,
method_key | UVERBS_API_ATTR_KEY_MASK);
}
static u32 uapi_get_obj_id(struct uverbs_attr_spec *spec)
{
if (spec->type == UVERBS_ATTR_TYPE_IDR ||
spec->type == UVERBS_ATTR_TYPE_FD)
return spec->u.obj.obj_type;
if (spec->type == UVERBS_ATTR_TYPE_IDRS_ARRAY)
return spec->u2.objs_arr.obj_type;
return UVERBS_API_KEY_ERR;
}
static void uapi_finalize_disable(struct uverbs_api *uapi)
{
struct radix_tree_iter iter;
u32 starting_key = 0;
bool scan_again = false;
void __rcu **slot;
again:
radix_tree_for_each_slot (slot, &uapi->radix, &iter, starting_key) {
if (uapi_key_is_object(iter.index)) {
struct uverbs_api_object *obj_elm =
rcu_dereference_protected(*slot, true);
if (obj_elm->disabled) {
/* Have to check all the attrs again */
scan_again = true;
starting_key = iter.index;
uapi_remove_object(uapi, iter.index);
goto again;
}
continue;
}
if (uapi_key_is_ioctl_method(iter.index)) {
struct uverbs_api_ioctl_method *method_elm =
rcu_dereference_protected(*slot, true);
if (method_elm->disabled) {
starting_key = iter.index;
uapi_remove_method(uapi, iter.index);
goto again;
}
continue;
}
if (uapi_key_is_attr(iter.index)) {
struct uverbs_api_attr *attr_elm =
rcu_dereference_protected(*slot, true);
const struct uverbs_api_object *tmp_obj;
u32 obj_key;
/*
* If the method has a mandatory object handle
* attribute which relies on an object which is not
* present then the entire method is uncallable.
*/
if (!attr_elm->spec.mandatory)
continue;
obj_key = uapi_get_obj_id(&attr_elm->spec);
if (obj_key == UVERBS_API_KEY_ERR)
continue;
tmp_obj = uapi_get_object(uapi, obj_key);
if (tmp_obj && !tmp_obj->disabled)
continue;
starting_key = iter.index;
uapi_remove_method(
uapi,
iter.index & (UVERBS_API_OBJ_KEY_MASK |
UVERBS_API_METHOD_KEY_MASK));
goto again;
}
WARN_ON(false);
}
if (!scan_again)
return;
scan_again = false;
starting_key = 0;
goto again;
}
void uverbs_destroy_api(struct uverbs_api *uapi)
{
if (!uapi)
return;
uapi_remove_range(uapi, 0, U32_MAX);
kfree(uapi);
}
@ -306,8 +452,7 @@ static const struct uapi_definition uverbs_core_api[] = {
{},
};
struct uverbs_api *uverbs_alloc_api(const struct uapi_definition *driver_def,
enum rdma_driver_id driver_id)
struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev)
{
struct uverbs_api *uapi;
int rc;
@ -317,15 +462,16 @@ struct uverbs_api *uverbs_alloc_api(const struct uapi_definition *driver_def,
return ERR_PTR(-ENOMEM);
INIT_RADIX_TREE(&uapi->radix, GFP_KERNEL);
uapi->driver_id = driver_id;
uapi->driver_id = ibdev->driver_id;
rc = uapi_merge_def(uapi, uverbs_core_api, false);
rc = uapi_merge_def(uapi, ibdev, uverbs_core_api, false);
if (rc)
goto err;
rc = uapi_merge_def(uapi, driver_def, true);
rc = uapi_merge_def(uapi, ibdev, ibdev->driver_def, true);
if (rc)
goto err;
uapi_finalize_disable(uapi);
rc = uapi_finalize(uapi);
if (rc)
goto err;
@ -333,8 +479,9 @@ struct uverbs_api *uverbs_alloc_api(const struct uapi_definition *driver_def,
return uapi;
err:
if (rc != -ENOMEM)
pr_err("Setup of uverbs_api failed, kernel parsing tree description is not valid (%d)??\n",
rc);
dev_err(&ibdev->dev,
"Setup of uverbs_api failed, kernel parsing tree description is not valid (%d)??\n",
rc);
uverbs_destroy_api(uapi);
return ERR_PTR(rc);

31
include/rdma/uverbs_ioctl.h
View File

@ -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) \
{ \