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1 /*
2  * Copyright (c) 2017, Mellanox Technologies inc.  All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32
33 #include <rdma/uverbs_std_types.h>
34 #include "rdma_core.h"
35 #include "uverbs.h"
36
37 static int uverbs_free_cq(struct ib_uobject *uobject,
38                           enum rdma_remove_reason why,
39                           struct uverbs_attr_bundle *attrs)
40 {
41         struct ib_cq *cq = uobject->object;
42         struct ib_uverbs_event_queue *ev_queue = cq->cq_context;
43         struct ib_ucq_object *ucq =
44                 container_of(uobject, struct ib_ucq_object, uobject);
45         int ret;
46
47         ret = ib_destroy_cq_user(cq, &attrs->driver_udata);
48         if (ib_is_destroy_retryable(ret, why, uobject))
49                 return ret;
50
51         ib_uverbs_release_ucq(
52                 attrs->ufile,
53                 ev_queue ? container_of(ev_queue,
54                                         struct ib_uverbs_completion_event_file,
55                                         ev_queue) :
56                            NULL,
57                 ucq);
58         return ret;
59 }
60
61 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
62         struct uverbs_attr_bundle *attrs)
63 {
64         struct ib_ucq_object *obj = container_of(
65                 uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE),
66                 typeof(*obj), uobject);
67         struct ib_device *ib_dev = attrs->context->device;
68         int ret;
69         u64 user_handle;
70         struct ib_cq_init_attr attr = {};
71         struct ib_cq                   *cq;
72         struct ib_uverbs_completion_event_file    *ev_file = NULL;
73         struct ib_uobject *ev_file_uobj;
74
75         if (!ib_dev->ops.create_cq || !ib_dev->ops.destroy_cq)
76                 return -EOPNOTSUPP;
77
78         ret = uverbs_copy_from(&attr.comp_vector, attrs,
79                                UVERBS_ATTR_CREATE_CQ_COMP_VECTOR);
80         if (!ret)
81                 ret = uverbs_copy_from(&attr.cqe, attrs,
82                                        UVERBS_ATTR_CREATE_CQ_CQE);
83         if (!ret)
84                 ret = uverbs_copy_from(&user_handle, attrs,
85                                        UVERBS_ATTR_CREATE_CQ_USER_HANDLE);
86         if (ret)
87                 return ret;
88
89         ret = uverbs_get_flags32(&attr.flags, attrs,
90                                  UVERBS_ATTR_CREATE_CQ_FLAGS,
91                                  IB_UVERBS_CQ_FLAGS_TIMESTAMP_COMPLETION |
92                                          IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN);
93         if (ret)
94                 return ret;
95
96         ev_file_uobj = uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_COMP_CHANNEL);
97         if (!IS_ERR(ev_file_uobj)) {
98                 ev_file = container_of(ev_file_uobj,
99                                        struct ib_uverbs_completion_event_file,
100                                        uobj);
101                 uverbs_uobject_get(ev_file_uobj);
102         }
103
104         if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) {
105                 ret = -EINVAL;
106                 goto err_event_file;
107         }
108
109         obj->comp_events_reported  = 0;
110         obj->async_events_reported = 0;
111         INIT_LIST_HEAD(&obj->comp_list);
112         INIT_LIST_HEAD(&obj->async_list);
113
114         cq = ib_dev->ops.create_cq(ib_dev, &attr, &attrs->driver_udata);
115         if (IS_ERR(cq)) {
116                 ret = PTR_ERR(cq);
117                 goto err_event_file;
118         }
119
120         cq->device        = ib_dev;
121         cq->uobject       = &obj->uobject;
122         cq->comp_handler  = ib_uverbs_comp_handler;
123         cq->event_handler = ib_uverbs_cq_event_handler;
124         cq->cq_context    = ev_file ? &ev_file->ev_queue : NULL;
125         obj->uobject.object = cq;
126         obj->uobject.user_handle = user_handle;
127         atomic_set(&cq->usecnt, 0);
128         cq->res.type = RDMA_RESTRACK_CQ;
129         rdma_restrack_uadd(&cq->res);
130
131         ret = uverbs_copy_to(attrs, UVERBS_ATTR_CREATE_CQ_RESP_CQE, &cq->cqe,
132                              sizeof(cq->cqe));
133         if (ret)
134                 goto err_cq;
135
136         return 0;
137 err_cq:
138         ib_destroy_cq_user(cq, uverbs_get_cleared_udata(attrs));
139
140 err_event_file:
141         if (ev_file)
142                 uverbs_uobject_put(ev_file_uobj);
143         return ret;
144 };
145
146 DECLARE_UVERBS_NAMED_METHOD(
147         UVERBS_METHOD_CQ_CREATE,
148         UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_CQ_HANDLE,
149                         UVERBS_OBJECT_CQ,
150                         UVERBS_ACCESS_NEW,
151                         UA_MANDATORY),
152         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_CQE,
153                            UVERBS_ATTR_TYPE(u32),
154                            UA_MANDATORY),
155         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_USER_HANDLE,
156                            UVERBS_ATTR_TYPE(u64),
157                            UA_MANDATORY),
158         UVERBS_ATTR_FD(UVERBS_ATTR_CREATE_CQ_COMP_CHANNEL,
159                        UVERBS_OBJECT_COMP_CHANNEL,
160                        UVERBS_ACCESS_READ,
161                        UA_OPTIONAL),
162         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_COMP_VECTOR,
163                            UVERBS_ATTR_TYPE(u32),
164                            UA_MANDATORY),
165         UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_CREATE_CQ_FLAGS,
166                              enum ib_uverbs_ex_create_cq_flags),
167         UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_CQ_RESP_CQE,
168                             UVERBS_ATTR_TYPE(u32),
169                             UA_MANDATORY),
170         UVERBS_ATTR_UHW());
171
172 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(
173         struct uverbs_attr_bundle *attrs)
174 {
175         struct ib_uobject *uobj =
176                 uverbs_attr_get_uobject(attrs, UVERBS_ATTR_DESTROY_CQ_HANDLE);
177         struct ib_ucq_object *obj =
178                 container_of(uobj, struct ib_ucq_object, uobject);
179         struct ib_uverbs_destroy_cq_resp resp = {
180                 .comp_events_reported = obj->comp_events_reported,
181                 .async_events_reported = obj->async_events_reported
182         };
183
184         return uverbs_copy_to(attrs, UVERBS_ATTR_DESTROY_CQ_RESP, &resp,
185                               sizeof(resp));
186 }
187
188 DECLARE_UVERBS_NAMED_METHOD(
189         UVERBS_METHOD_CQ_DESTROY,
190         UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_CQ_HANDLE,
191                         UVERBS_OBJECT_CQ,
192                         UVERBS_ACCESS_DESTROY,
193                         UA_MANDATORY),
194         UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_DESTROY_CQ_RESP,
195                             UVERBS_ATTR_TYPE(struct ib_uverbs_destroy_cq_resp),
196                             UA_MANDATORY));
197
198 DECLARE_UVERBS_NAMED_OBJECT(
199         UVERBS_OBJECT_CQ,
200         UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_ucq_object), uverbs_free_cq),
201
202 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_LEGACY_VERBS_NEW_UAPI)
203         &UVERBS_METHOD(UVERBS_METHOD_CQ_CREATE),
204         &UVERBS_METHOD(UVERBS_METHOD_CQ_DESTROY)
205 #endif
206 );
207
208 const struct uapi_definition uverbs_def_obj_cq[] = {
209         UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_CQ,
210                                       UAPI_DEF_OBJ_NEEDS_FN(destroy_cq)),
211         {}
212 };