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[linux.git] / drivers / infiniband / core / uverbs.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 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 UVERBS_H
38 #define UVERBS_H
39
40 #include <linux/kref.h>
41 #include <linux/idr.h>
42 #include <linux/mutex.h>
43 #include <linux/completion.h>
44 #include <linux/cdev.h>
45
46 #include <rdma/ib_verbs.h>
47 #include <rdma/ib_umem.h>
48 #include <rdma/ib_user_verbs.h>
49 #include <rdma/uverbs_std_types.h>
50
51 #define UVERBS_MODULE_NAME ib_uverbs
52 #include <rdma/uverbs_named_ioctl.h>
53
54 static inline void
55 ib_uverbs_init_udata(struct ib_udata *udata,
56                      const void __user *ibuf,
57                      void __user *obuf,
58                      size_t ilen, size_t olen)
59 {
60         udata->inbuf  = ibuf;
61         udata->outbuf = obuf;
62         udata->inlen  = ilen;
63         udata->outlen = olen;
64 }
65
66 static inline void
67 ib_uverbs_init_udata_buf_or_null(struct ib_udata *udata,
68                                  const void __user *ibuf,
69                                  void __user *obuf,
70                                  size_t ilen, size_t olen)
71 {
72         ib_uverbs_init_udata(udata,
73                              ilen ? ibuf : NULL, olen ? obuf : NULL,
74                              ilen, olen);
75 }
76
77 /*
78  * Our lifetime rules for these structs are the following:
79  *
80  * struct ib_uverbs_device: One reference is held by the module and
81  * released in ib_uverbs_remove_one().  Another reference is taken by
82  * ib_uverbs_open() each time the character special file is opened,
83  * and released in ib_uverbs_release_file() when the file is released.
84  *
85  * struct ib_uverbs_file: One reference is held by the VFS and
86  * released when the file is closed.  Another reference is taken when
87  * an asynchronous event queue file is created and released when the
88  * event file is closed.
89  *
90  * struct ib_uverbs_event_queue: Base structure for
91  * struct ib_uverbs_async_event_file and struct ib_uverbs_completion_event_file.
92  * One reference is held by the VFS and released when the file is closed.
93  * For asynchronous event files, another reference is held by the corresponding
94  * main context file and released when that file is closed.  For completion
95  * event files, a reference is taken when a CQ is created that uses the file,
96  * and released when the CQ is destroyed.
97  */
98
99 struct ib_uverbs_device {
100         atomic_t                                refcount;
101         int                                     num_comp_vectors;
102         struct completion                       comp;
103         struct device                           dev;
104         /* First group for device attributes, NULL terminated array */
105         const struct attribute_group            *groups[2];
106         struct ib_device        __rcu          *ib_dev;
107         int                                     devnum;
108         struct cdev                             cdev;
109         struct rb_root                          xrcd_tree;
110         struct mutex                            xrcd_tree_mutex;
111         struct srcu_struct                      disassociate_srcu;
112         struct mutex                            lists_mutex; /* protect lists */
113         struct list_head                        uverbs_file_list;
114         struct list_head                        uverbs_events_file_list;
115         struct uverbs_api                       *uapi;
116 };
117
118 struct ib_uverbs_event_queue {
119         spinlock_t                              lock;
120         int                                     is_closed;
121         wait_queue_head_t                       poll_wait;
122         struct fasync_struct                   *async_queue;
123         struct list_head                        event_list;
124 };
125
126 struct ib_uverbs_async_event_file {
127         struct ib_uverbs_event_queue            ev_queue;
128         struct ib_uverbs_file                  *uverbs_file;
129         struct kref                             ref;
130         struct list_head                        list;
131 };
132
133 struct ib_uverbs_completion_event_file {
134         struct ib_uobject                       uobj;
135         struct ib_uverbs_event_queue            ev_queue;
136 };
137
138 struct ib_uverbs_file {
139         struct kref                             ref;
140         struct ib_uverbs_device                *device;
141         struct mutex                            ucontext_lock;
142         /*
143          * ucontext must be accessed via ib_uverbs_get_ucontext() or with
144          * ucontext_lock held
145          */
146         struct ib_ucontext                     *ucontext;
147         struct ib_event_handler                 event_handler;
148         struct ib_uverbs_async_event_file       *async_file;
149         struct list_head                        list;
150
151         /*
152          * To access the uobjects list hw_destroy_rwsem must be held for write
153          * OR hw_destroy_rwsem held for read AND uobjects_lock held.
154          * hw_destroy_rwsem should be called across any destruction of the HW
155          * object of an associated uobject.
156          */
157         struct rw_semaphore     hw_destroy_rwsem;
158         spinlock_t              uobjects_lock;
159         struct list_head        uobjects;
160
161         struct mutex umap_lock;
162         struct list_head umaps;
163
164         u64 uverbs_cmd_mask;
165         u64 uverbs_ex_cmd_mask;
166
167         struct idr              idr;
168         /* spinlock protects write access to idr */
169         spinlock_t              idr_lock;
170 };
171
172 struct ib_uverbs_event {
173         union {
174                 struct ib_uverbs_async_event_desc       async;
175                 struct ib_uverbs_comp_event_desc        comp;
176         }                                       desc;
177         struct list_head                        list;
178         struct list_head                        obj_list;
179         u32                                    *counter;
180 };
181
182 struct ib_uverbs_mcast_entry {
183         struct list_head        list;
184         union ib_gid            gid;
185         u16                     lid;
186 };
187
188 struct ib_uevent_object {
189         struct ib_uobject       uobject;
190         struct list_head        event_list;
191         u32                     events_reported;
192 };
193
194 struct ib_uxrcd_object {
195         struct ib_uobject       uobject;
196         atomic_t                refcnt;
197 };
198
199 struct ib_usrq_object {
200         struct ib_uevent_object uevent;
201         struct ib_uxrcd_object *uxrcd;
202 };
203
204 struct ib_uqp_object {
205         struct ib_uevent_object uevent;
206         /* lock for mcast list */
207         struct mutex            mcast_lock;
208         struct list_head        mcast_list;
209         struct ib_uxrcd_object *uxrcd;
210 };
211
212 struct ib_uwq_object {
213         struct ib_uevent_object uevent;
214 };
215
216 struct ib_ucq_object {
217         struct ib_uobject       uobject;
218         struct list_head        comp_list;
219         struct list_head        async_list;
220         u32                     comp_events_reported;
221         u32                     async_events_reported;
222 };
223
224 extern const struct file_operations uverbs_event_fops;
225 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue);
226 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
227                                               struct ib_device *ib_dev);
228 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *uverbs_file);
229 void ib_uverbs_flow_resources_free(struct ib_uflow_resources *uflow_res);
230
231 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
232                            struct ib_uverbs_completion_event_file *ev_file,
233                            struct ib_ucq_object *uobj);
234 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
235                               struct ib_uevent_object *uobj);
236 void ib_uverbs_release_file(struct kref *ref);
237
238 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context);
239 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr);
240 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr);
241 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr);
242 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr);
243 void ib_uverbs_event_handler(struct ib_event_handler *handler,
244                              struct ib_event *event);
245 int ib_uverbs_dealloc_xrcd(struct ib_uobject *uobject, struct ib_xrcd *xrcd,
246                            enum rdma_remove_reason why);
247
248 int uverbs_dealloc_mw(struct ib_mw *mw);
249 void ib_uverbs_detach_umcast(struct ib_qp *qp,
250                              struct ib_uqp_object *uobj);
251
252 void create_udata(struct uverbs_attr_bundle *ctx, struct ib_udata *udata);
253 long ib_uverbs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
254
255 struct ib_uverbs_flow_spec {
256         union {
257                 union {
258                         struct ib_uverbs_flow_spec_hdr hdr;
259                         struct {
260                                 __u32 type;
261                                 __u16 size;
262                                 __u16 reserved;
263                         };
264                 };
265                 struct ib_uverbs_flow_spec_eth     eth;
266                 struct ib_uverbs_flow_spec_ipv4    ipv4;
267                 struct ib_uverbs_flow_spec_esp     esp;
268                 struct ib_uverbs_flow_spec_tcp_udp tcp_udp;
269                 struct ib_uverbs_flow_spec_ipv6    ipv6;
270                 struct ib_uverbs_flow_spec_action_tag   flow_tag;
271                 struct ib_uverbs_flow_spec_action_drop  drop;
272                 struct ib_uverbs_flow_spec_action_handle action;
273                 struct ib_uverbs_flow_spec_action_count flow_count;
274         };
275 };
276
277 int ib_uverbs_kern_spec_to_ib_spec_filter(enum ib_flow_spec_type type,
278                                           const void *kern_spec_mask,
279                                           const void *kern_spec_val,
280                                           size_t kern_filter_sz,
281                                           union ib_flow_spec *ib_spec);
282
283 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_DEVICE);
284 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_PD);
285 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_MR);
286 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_COMP_CHANNEL);
287 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_CQ);
288 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_QP);
289 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_AH);
290 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_MW);
291 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_SRQ);
292 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_FLOW);
293 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_WQ);
294 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_RWQ_IND_TBL);
295 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_XRCD);
296 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_FLOW_ACTION);
297 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_DM);
298 extern const struct uverbs_object_def UVERBS_OBJECT(UVERBS_OBJECT_COUNTERS);
299
300 #define IB_UVERBS_DECLARE_CMD(name)                                     \
301         ssize_t ib_uverbs_##name(struct ib_uverbs_file *file,           \
302                                  const char __user *buf, int in_len,    \
303                                  int out_len)
304
305 IB_UVERBS_DECLARE_CMD(get_context);
306 IB_UVERBS_DECLARE_CMD(query_device);
307 IB_UVERBS_DECLARE_CMD(query_port);
308 IB_UVERBS_DECLARE_CMD(alloc_pd);
309 IB_UVERBS_DECLARE_CMD(dealloc_pd);
310 IB_UVERBS_DECLARE_CMD(reg_mr);
311 IB_UVERBS_DECLARE_CMD(rereg_mr);
312 IB_UVERBS_DECLARE_CMD(dereg_mr);
313 IB_UVERBS_DECLARE_CMD(alloc_mw);
314 IB_UVERBS_DECLARE_CMD(dealloc_mw);
315 IB_UVERBS_DECLARE_CMD(create_comp_channel);
316 IB_UVERBS_DECLARE_CMD(create_cq);
317 IB_UVERBS_DECLARE_CMD(resize_cq);
318 IB_UVERBS_DECLARE_CMD(poll_cq);
319 IB_UVERBS_DECLARE_CMD(req_notify_cq);
320 IB_UVERBS_DECLARE_CMD(destroy_cq);
321 IB_UVERBS_DECLARE_CMD(create_qp);
322 IB_UVERBS_DECLARE_CMD(open_qp);
323 IB_UVERBS_DECLARE_CMD(query_qp);
324 IB_UVERBS_DECLARE_CMD(modify_qp);
325 IB_UVERBS_DECLARE_CMD(destroy_qp);
326 IB_UVERBS_DECLARE_CMD(post_send);
327 IB_UVERBS_DECLARE_CMD(post_recv);
328 IB_UVERBS_DECLARE_CMD(post_srq_recv);
329 IB_UVERBS_DECLARE_CMD(create_ah);
330 IB_UVERBS_DECLARE_CMD(destroy_ah);
331 IB_UVERBS_DECLARE_CMD(attach_mcast);
332 IB_UVERBS_DECLARE_CMD(detach_mcast);
333 IB_UVERBS_DECLARE_CMD(create_srq);
334 IB_UVERBS_DECLARE_CMD(modify_srq);
335 IB_UVERBS_DECLARE_CMD(query_srq);
336 IB_UVERBS_DECLARE_CMD(destroy_srq);
337 IB_UVERBS_DECLARE_CMD(create_xsrq);
338 IB_UVERBS_DECLARE_CMD(open_xrcd);
339 IB_UVERBS_DECLARE_CMD(close_xrcd);
340
341 #define IB_UVERBS_DECLARE_EX_CMD(name)                          \
342         int ib_uverbs_ex_##name(struct ib_uverbs_file *file,    \
343                                 struct ib_udata *ucore,         \
344                                 struct ib_udata *uhw)
345
346 IB_UVERBS_DECLARE_EX_CMD(create_flow);
347 IB_UVERBS_DECLARE_EX_CMD(destroy_flow);
348 IB_UVERBS_DECLARE_EX_CMD(query_device);
349 IB_UVERBS_DECLARE_EX_CMD(create_cq);
350 IB_UVERBS_DECLARE_EX_CMD(create_qp);
351 IB_UVERBS_DECLARE_EX_CMD(create_wq);
352 IB_UVERBS_DECLARE_EX_CMD(modify_wq);
353 IB_UVERBS_DECLARE_EX_CMD(destroy_wq);
354 IB_UVERBS_DECLARE_EX_CMD(create_rwq_ind_table);
355 IB_UVERBS_DECLARE_EX_CMD(destroy_rwq_ind_table);
356 IB_UVERBS_DECLARE_EX_CMD(modify_qp);
357 IB_UVERBS_DECLARE_EX_CMD(modify_cq);
358
359 #endif /* UVERBS_H */