drivers/infiniband/core/uverbs_std_types_cq.c

   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 {
  40         struct ib_cq *cq = uobject->object;
  41         struct ib_uverbs_event_queue *ev_queue = cq->cq_context;
  42         struct ib_ucq_object *ucq =
  43                 container_of(uobject, struct ib_ucq_object, uobject);
  44         int ret;
  45
  46         ret = ib_destroy_cq(cq);
  47         if (ib_is_destroy_retryable(ret, why, uobject))
  48                 return ret;
  49
  50         ib_uverbs_release_ucq(
  51                 uobject->context->ufile,
  52                 ev_queue ? container_of(ev_queue,
  53                                         struct ib_uverbs_completion_event_file,
  54                                         ev_queue) :
  55                            NULL,
  56                 ucq);
  57         return ret;
  58 }
  59
  60 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
  61         struct ib_uverbs_file *file, struct uverbs_attr_bundle *attrs)
  62 {
  63         struct ib_ucq_object *obj = container_of(
  64                 uverbs_attr_get_uobject(attrs, UVERBS_ATTR_CREATE_CQ_HANDLE),
  65                 typeof(*obj), uobject);
  66         struct ib_device *ib_dev = obj->uobject.context->device;
  67         struct ib_udata uhw;
  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->create_cq || !ib_dev->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 >= file->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         /* Temporary, only until drivers get the new uverbs_attr_bundle */
 115         create_udata(attrs, &uhw);
 116
 117         cq = ib_dev->create_cq(ib_dev, &attr, obj->uobject.context, &uhw);
 118         if (IS_ERR(cq)) {
 119                 ret = PTR_ERR(cq);
 120                 goto err_event_file;
 121         }
 122
 123         cq->device        = ib_dev;
 124         cq->uobject       = &obj->uobject;
 125         cq->comp_handler  = ib_uverbs_comp_handler;
 126         cq->event_handler = ib_uverbs_cq_event_handler;
 127         cq->cq_context    = ev_file ? &ev_file->ev_queue : NULL;
 128         obj->uobject.object = cq;
 129         obj->uobject.user_handle = user_handle;
 130         atomic_set(&cq->usecnt, 0);
 131         cq->res.type = RDMA_RESTRACK_CQ;
 132         rdma_restrack_add(&cq->res);
 133
 134         ret = uverbs_copy_to(attrs, UVERBS_ATTR_CREATE_CQ_RESP_CQE, &cq->cqe,
 135                              sizeof(cq->cqe));
 136         if (ret)
 137                 goto err_cq;
 138
 139         return 0;
 140 err_cq:
 141         ib_destroy_cq(cq);
 142
 143 err_event_file:
 144         if (ev_file)
 145                 uverbs_uobject_put(ev_file_uobj);
 146         return ret;
 147 };
 148
 149 DECLARE_UVERBS_NAMED_METHOD(
 150         UVERBS_METHOD_CQ_CREATE,
 151         UVERBS_ATTR_IDR(UVERBS_ATTR_CREATE_CQ_HANDLE,
 152                         UVERBS_OBJECT_CQ,
 153                         UVERBS_ACCESS_NEW,
 154                         UA_MANDATORY),
 155         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_CQE,
 156                            UVERBS_ATTR_TYPE(u32),
 157                            UA_MANDATORY),
 158         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_USER_HANDLE,
 159                            UVERBS_ATTR_TYPE(u64),
 160                            UA_MANDATORY),
 161         UVERBS_ATTR_FD(UVERBS_ATTR_CREATE_CQ_COMP_CHANNEL,
 162                        UVERBS_OBJECT_COMP_CHANNEL,
 163                        UVERBS_ACCESS_READ,
 164                        UA_OPTIONAL),
 165         UVERBS_ATTR_PTR_IN(UVERBS_ATTR_CREATE_CQ_COMP_VECTOR,
 166                            UVERBS_ATTR_TYPE(u32),
 167                            UA_MANDATORY),
 168         UVERBS_ATTR_FLAGS_IN(UVERBS_ATTR_CREATE_CQ_FLAGS,
 169                              enum ib_uverbs_ex_create_cq_flags),
 170         UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_CQ_RESP_CQE,
 171                             UVERBS_ATTR_TYPE(u32),
 172                             UA_MANDATORY),
 173         UVERBS_ATTR_UHW());
 174
 175 static int UVERBS_HANDLER(UVERBS_METHOD_CQ_DESTROY)(
 176         struct ib_uverbs_file *file, struct uverbs_attr_bundle *attrs)
 177 {
 178         struct ib_uobject *uobj =
 179                 uverbs_attr_get_uobject(attrs, UVERBS_ATTR_DESTROY_CQ_HANDLE);
 180         struct ib_ucq_object *obj =
 181                 container_of(uobj, struct ib_ucq_object, uobject);
 182         struct ib_uverbs_destroy_cq_resp resp = {
 183                 .comp_events_reported = obj->comp_events_reported,
 184                 .async_events_reported = obj->async_events_reported
 185         };
 186
 187         return uverbs_copy_to(attrs, UVERBS_ATTR_DESTROY_CQ_RESP, &resp,
 188                               sizeof(resp));
 189 }
 190
 191 DECLARE_UVERBS_NAMED_METHOD(
 192         UVERBS_METHOD_CQ_DESTROY,
 193         UVERBS_ATTR_IDR(UVERBS_ATTR_DESTROY_CQ_HANDLE,
 194                         UVERBS_OBJECT_CQ,
 195                         UVERBS_ACCESS_DESTROY,
 196                         UA_MANDATORY),
 197         UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_DESTROY_CQ_RESP,
 198                             UVERBS_ATTR_TYPE(struct ib_uverbs_destroy_cq_resp),
 199                             UA_MANDATORY));
 200
 201 DECLARE_UVERBS_NAMED_OBJECT(
 202         UVERBS_OBJECT_CQ,
 203         UVERBS_TYPE_ALLOC_IDR_SZ(sizeof(struct ib_ucq_object), uverbs_free_cq),
 204
 205 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_LEGACY_VERBS_NEW_UAPI)
 206         &UVERBS_METHOD(UVERBS_METHOD_CQ_CREATE),
 207         &UVERBS_METHOD(UVERBS_METHOD_CQ_DESTROY)
 208 #endif
 209 );