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 #include "restrack.h"
37 
uverbs_free_cq(struct ib_uobject * uobject,enum rdma_remove_reason why,struct uverbs_attr_bundle * attrs)38 static int uverbs_free_cq(struct ib_uobject *uobject,
39 			  enum rdma_remove_reason why,
40 			  struct uverbs_attr_bundle *attrs)
41 {
42 	struct ib_cq *cq = uobject->object;
43 	struct ib_uverbs_event_queue *ev_queue = cq->cq_context;
44 	struct ib_ucq_object *ucq =
45 		container_of(uobject, struct ib_ucq_object, uevent.uobject);
46 	int ret;
47 
48 	ret = ib_destroy_cq_user(cq, &attrs->driver_udata);
49 	if (ret)
50 		return ret;
51 
52 	ib_uverbs_release_ucq(
53 		ev_queue ? container_of(ev_queue,
54 					struct ib_uverbs_completion_event_file,
55 					ev_queue) :
56 			   NULL,
57 		ucq);
58 	return 0;
59 }
60 
UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)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), uevent.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 	obj->uevent.event_file = ib_uverbs_get_async_event(
105 		attrs, UVERBS_ATTR_CREATE_CQ_EVENT_FD);
106 
107 	if (attr.comp_vector >= attrs->ufile->device->num_comp_vectors) {
108 		ret = -EINVAL;
109 		goto err_event_file;
110 	}
111 
112 	INIT_LIST_HEAD(&obj->comp_list);
113 	INIT_LIST_HEAD(&obj->uevent.event_list);
114 
115 	cq = rdma_zalloc_drv_obj(ib_dev, ib_cq);
116 	if (!cq) {
117 		ret = -ENOMEM;
118 		goto err_event_file;
119 	}
120 
121 	cq->device        = ib_dev;
122 	cq->uobject       = obj;
123 	cq->comp_handler  = ib_uverbs_comp_handler;
124 	cq->event_handler = ib_uverbs_cq_event_handler;
125 	cq->cq_context    = ev_file ? &ev_file->ev_queue : NULL;
126 	atomic_set(&cq->usecnt, 0);
127 
128 	rdma_restrack_new(&cq->res, RDMA_RESTRACK_CQ);
129 	rdma_restrack_set_name(&cq->res, NULL);
130 
131 	ret = ib_dev->ops.create_cq(cq, &attr, &attrs->driver_udata);
132 	if (ret)
133 		goto err_free;
134 
135 	obj->uevent.uobject.object = cq;
136 	obj->uevent.uobject.user_handle = user_handle;
137 	rdma_restrack_add(&cq->res);
138 	uverbs_finalize_uobj_create(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE);
139 
140 	ret = uverbs_copy_to(attrs, UVERBS_ATTR_CREATE_CQ_RESP_CQE, &cq->cqe,
141 			     sizeof(cq->cqe));
142 	return ret;
143 
144 err_free:
145 	rdma_restrack_put(&cq->res);
146 	kfree(cq);
147 err_event_file:
148 	if (obj->uevent.event_file)
149 		uverbs_uobject_put(&obj->uevent.event_file->uobj);
150 	if (ev_file)
151 		uverbs_uobject_put(ev_file_uobj);
152 	return ret;
153 };
154 
155 DECLARE_UVERBS_NAMED_METHOD(
156 	UVERBS_METHOD_CQ_CREATE,
157 	UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_CQ_HANDLE,
158 			UVERBS_OBJECT_CQ,
159 			UVERBS_ACCESS_NEW,
160 			UA_MANDATORY),
161 	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_CQE,
162 			   UVERBS_ATTR_TYPE(u32),
163 			   UA_MANDATORY),
164 	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_USER_HANDLE,
165 			   UVERBS_ATTR_TYPE(u64),
166 			   UA_MANDATORY),
167 	UVERBS_ATTR_FD(UVERBS_ATTR_CREATE_CQ_COMP_CHANNEL,
168 		       UVERBS_OBJECT_COMP_CHANNEL,
169 		       UVERBS_ACCESS_READ,
170 		       UA_OPTIONAL),
171 	UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_COMP_VECTOR,
172 			   UVERBS_ATTR_TYPE(u32),
173 			   UA_MANDATORY),
174 	UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_CREATE_CQ_FLAGS,
175 			     enum ib_uverbs_ex_create_cq_flags),
176 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_CQ_RESP_CQE,
177 			    UVERBS_ATTR_TYPE(u32),
178 			    UA_MANDATORY),
179 	UVERBS_ATTR_FD(UVERBS_ATTR_CREATE_CQ_EVENT_FD,
180 		       UVERBS_OBJECT_ASYNC_EVENT,
181 		       UVERBS_ACCESS_READ,
182 		       UA_OPTIONAL),
183 	UVERBS_ATTR_UHW());
184 
UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)185 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(
186 	struct uverbs_attr_bundle *attrs)
187 {
188 	struct ib_uobject *uobj =
189 		uverbs_attr_get_uobject(attrs, UVERBS_ATTR_DESTROY_CQ_HANDLE);
190 	struct ib_ucq_object *obj =
191 		container_of(uobj, struct ib_ucq_object, uevent.uobject);
192 	struct ib_uverbs_destroy_cq_resp resp = {
193 		.comp_events_reported = obj->comp_events_reported,
194 		.async_events_reported = obj->uevent.events_reported
195 	};
196 
197 	return uverbs_copy_to(attrs, UVERBS_ATTR_DESTROY_CQ_RESP, &resp,
198 			      sizeof(resp));
199 }
200 
201 DECLARE_UVERBS_NAMED_METHOD(
202 	UVERBS_METHOD_CQ_DESTROY,
203 	UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_CQ_HANDLE,
204 			UVERBS_OBJECT_CQ,
205 			UVERBS_ACCESS_DESTROY,
206 			UA_MANDATORY),
207 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_DESTROY_CQ_RESP,
208 			    UVERBS_ATTR_TYPE(struct ib_uverbs_destroy_cq_resp),
209 			    UA_MANDATORY));
210 
211 DECLARE_UVERBS_NAMED_OBJECT(
212 	UVERBS_OBJECT_CQ,
213 	UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_ucq_object), uverbs_free_cq),
214 	&UVERBS_METHOD(UVERBS_METHOD_CQ_CREATE),
215 	&UVERBS_METHOD(UVERBS_METHOD_CQ_DESTROY)
216 );
217 
218 const struct uapi_definition uverbs_def_obj_cq[] = {
219 	UAPI_DEF_CHAIN_OBJ_TREE_NAMED(UVERBS_OBJECT_CQ,
220 				      UAPI_DEF_OBJ_NEEDS_FN(destroy_cq)),
221 	{}
222 };
223