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1/*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
4 * Copyright (c) 2005-2017 Mellanox Technologies. All rights reserved.
5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6 * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 */
36
37#ifndef RDMA_CORE_H
38#define RDMA_CORE_H
39
40#include <linux/idr.h>
41#include <rdma/uverbs_types.h>
42#include <rdma/uverbs_ioctl.h>
43#include <rdma/ib_verbs.h>
44#include <linux/mutex.h>
45
46struct ib_uverbs_device;
47
48void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile,
49 enum rdma_remove_reason reason);
50
51int uobj_destroy(struct ib_uobject *uobj, struct uverbs_attr_bundle *attrs);
52
53/*
54 * Get an ib_uobject that corresponds to the given id from ufile, assuming
55 * the object is from the given type. Lock it to the required access when
56 * applicable.
57 * This function could create (access == NEW), destroy (access == DESTROY)
58 * or unlock (access == READ || access == WRITE) objects if required.
59 * The action will be finalized only when uverbs_finalize_object or
60 * uverbs_finalize_objects are called.
61 */
62struct ib_uobject *
63uverbs_get_uobject_from_file(u16 object_id, enum uverbs_obj_access access,
64 s64 id, struct uverbs_attr_bundle *attrs);
65
66void uverbs_finalize_object(struct ib_uobject *uobj,
67 enum uverbs_obj_access access, bool hw_obj_valid,
68 bool commit, struct uverbs_attr_bundle *attrs);
69
70int uverbs_output_written(const struct uverbs_attr_bundle *bundle, size_t idx);
71
72void setup_ufile_idr_uobject(struct ib_uverbs_file *ufile);
73void release_ufile_idr_uobject(struct ib_uverbs_file *ufile);
74
75struct ib_udata *uverbs_get_cleared_udata(struct uverbs_attr_bundle *attrs);
76
77/*
78 * This is the runtime description of the uverbs API, used by the syscall
79 * machinery to validate and dispatch calls.
80 */
81
82/*
83 * Depending on ID the slot pointer in the radix tree points at one of these
84 * structs.
85 */
86
87struct uverbs_api_ioctl_method {
88 int(__rcu *handler)(struct uverbs_attr_bundle *attrs);
89 DECLARE_BITMAP(attr_mandatory, UVERBS_API_ATTR_BKEY_LEN);
90 u16 bundle_size;
91 u8 use_stack:1;
92 u8 driver_method:1;
93 u8 disabled:1;
94 u8 has_udata:1;
95 u8 key_bitmap_len;
96 u8 destroy_bkey;
97};
98
99struct uverbs_api_write_method {
100 int (*handler)(struct uverbs_attr_bundle *attrs);
101 u8 disabled:1;
102 u8 is_ex:1;
103 u8 has_udata:1;
104 u8 has_resp:1;
105 u8 req_size;
106 u8 resp_size;
107};
108
109struct uverbs_api_attr {
110 struct uverbs_attr_spec spec;
111};
112
113struct uverbs_api {
114 /* radix tree contains struct uverbs_api_* pointers */
115 struct radix_tree_root radix;
116 enum rdma_driver_id driver_id;
117
118 unsigned int num_write;
119 unsigned int num_write_ex;
120 struct uverbs_api_write_method notsupp_method;
121 const struct uverbs_api_write_method **write_methods;
122 const struct uverbs_api_write_method **write_ex_methods;
123};
124
125/*
126 * Get an uverbs_api_object that corresponds to the given object_id.
127 * Note:
128 * -ENOMSG means that any object is allowed to match during lookup.
129 */
130static inline const struct uverbs_api_object *
131uapi_get_object(struct uverbs_api *uapi, u16 object_id)
132{
133 const struct uverbs_api_object *res;
134
135 if (object_id == UVERBS_IDR_ANY_OBJECT)
136 return ERR_PTR(-ENOMSG);
137
138 res = radix_tree_lookup(&uapi->radix, uapi_key_obj(object_id));
139 if (!res)
140 return ERR_PTR(-ENOENT);
141
142 return res;
143}
144
145char *uapi_key_format(char *S, unsigned int key);
146struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev);
147void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev);
148void uverbs_disassociate_api(struct uverbs_api *uapi);
149void uverbs_destroy_api(struct uverbs_api *uapi);
150void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
151 unsigned int num_attrs);
152void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile);
153
154extern const struct uapi_definition uverbs_def_obj_async_fd[];
155extern const struct uapi_definition uverbs_def_obj_counters[];
156extern const struct uapi_definition uverbs_def_obj_cq[];
157extern const struct uapi_definition uverbs_def_obj_device[];
158extern const struct uapi_definition uverbs_def_obj_dm[];
159extern const struct uapi_definition uverbs_def_obj_flow_action[];
160extern const struct uapi_definition uverbs_def_obj_intf[];
161extern const struct uapi_definition uverbs_def_obj_mr[];
162extern const struct uapi_definition uverbs_def_obj_qp[];
163extern const struct uapi_definition uverbs_def_obj_srq[];
164extern const struct uapi_definition uverbs_def_obj_wq[];
165extern const struct uapi_definition uverbs_def_write_intf[];
166
167static inline const struct uverbs_api_write_method *
168uapi_get_method(const struct uverbs_api *uapi, u32 command)
169{
170 u32 cmd_idx = command & IB_USER_VERBS_CMD_COMMAND_MASK;
171
172 if (command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
173 IB_USER_VERBS_CMD_COMMAND_MASK))
174 return ERR_PTR(-EINVAL);
175
176 if (command & IB_USER_VERBS_CMD_FLAG_EXTENDED) {
177 if (cmd_idx >= uapi->num_write_ex)
178 return ERR_PTR(-EOPNOTSUPP);
179 return uapi->write_ex_methods[cmd_idx];
180 }
181
182 if (cmd_idx >= uapi->num_write)
183 return ERR_PTR(-EOPNOTSUPP);
184 return uapi->write_methods[cmd_idx];
185}
186
187void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
188 struct ib_udata *udata, unsigned int attr_in,
189 unsigned int attr_out);
190
191#endif /* RDMA_CORE_H */
1/*
2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
4 * Copyright (c) 2005-2017 Mellanox Technologies. All rights reserved.
5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6 * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 */
36
37#ifndef RDMA_CORE_H
38#define RDMA_CORE_H
39
40#include <linux/idr.h>
41#include <rdma/uverbs_types.h>
42#include <rdma/uverbs_ioctl.h>
43#include <rdma/ib_verbs.h>
44#include <linux/mutex.h>
45
46int uverbs_ns_idx(u16 *id, unsigned int ns_count);
47const struct uverbs_object_spec *uverbs_get_object(const struct ib_device *ibdev,
48 uint16_t object);
49const struct uverbs_method_spec *uverbs_get_method(const struct uverbs_object_spec *object,
50 uint16_t method);
51/*
52 * These functions initialize the context and cleanups its uobjects.
53 * The context has a list of objects which is protected by a mutex
54 * on the context. initialize_ucontext should be called when we create
55 * a context.
56 * cleanup_ucontext removes all uobjects from the context and puts them.
57 */
58void uverbs_cleanup_ucontext(struct ib_ucontext *ucontext, bool device_removed);
59void uverbs_initialize_ucontext(struct ib_ucontext *ucontext);
60
61/*
62 * uverbs_uobject_get is called in order to increase the reference count on
63 * an uobject. This is useful when a handler wants to keep the uobject's memory
64 * alive, regardless if this uobject is still alive in the context's objects
65 * repository. Objects are put via uverbs_uobject_put.
66 */
67void uverbs_uobject_get(struct ib_uobject *uobject);
68
69/*
70 * In order to indicate we no longer needs this uobject, uverbs_uobject_put
71 * is called. When the reference count is decreased, the uobject is freed.
72 * For example, this is used when attaching a completion channel to a CQ.
73 */
74void uverbs_uobject_put(struct ib_uobject *uobject);
75
76/* Indicate this fd is no longer used by this consumer, but its memory isn't
77 * necessarily released yet. When the last reference is put, we release the
78 * memory. After this call is executed, calling uverbs_uobject_get isn't
79 * allowed.
80 * This must be called from the release file_operations of the file!
81 */
82void uverbs_close_fd(struct file *f);
83
84/*
85 * Get an ib_uobject that corresponds to the given id from ucontext, assuming
86 * the object is from the given type. Lock it to the required access when
87 * applicable.
88 * This function could create (access == NEW), destroy (access == DESTROY)
89 * or unlock (access == READ || access == WRITE) objects if required.
90 * The action will be finalized only when uverbs_finalize_object or
91 * uverbs_finalize_objects are called.
92 */
93struct ib_uobject *uverbs_get_uobject_from_context(const struct uverbs_obj_type *type_attrs,
94 struct ib_ucontext *ucontext,
95 enum uverbs_obj_access access,
96 int id);
97int uverbs_finalize_object(struct ib_uobject *uobj,
98 enum uverbs_obj_access access,
99 bool commit);
100/*
101 * Note that certain finalize stages could return a status:
102 * (a) alloc_commit could return a failure if the object is committed at the
103 * same time when the context is destroyed.
104 * (b) remove_commit could fail if the object wasn't destroyed successfully.
105 * Since multiple objects could be finalized in one transaction, it is very NOT
106 * recommended to have several finalize actions which have side effects.
107 * For example, it's NOT recommended to have a certain action which has both
108 * a commit action and a destroy action or two destroy objects in the same
109 * action. The rule of thumb is to have one destroy or commit action with
110 * multiple lookups.
111 * The first non zero return value of finalize_object is returned from this
112 * function. For example, this could happen when we couldn't destroy an
113 * object.
114 */
115int uverbs_finalize_objects(struct uverbs_attr_bundle *attrs_bundle,
116 struct uverbs_attr_spec_hash * const *spec_hash,
117 size_t num,
118 bool commit);
119
120#endif /* RDMA_CORE_H */