drivers/infiniband/core/cma_configfs.c

   1 /*
   2  * Copyright (c) 2015, 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 <linux/configfs.h>
  34 #include <rdma/ib_verbs.h>
  35 #include <rdma/rdma_cm.h>
  36
  37 #include "core_priv.h"
  38 #include "cma_priv.h"
  39
  40 struct cma_device;
  41
  42 struct cma_dev_group;
  43
  44 struct cma_dev_port_group {
  45         u32                     port_num;
  46         struct cma_dev_group    *cma_dev_group;
  47         struct config_group     group;
  48 };
  49
  50 struct cma_dev_group {
  51         char                            name[IB_DEVICE_NAME_MAX];
  52         struct config_group             device_group;
  53         struct config_group             ports_group;
  54         struct cma_dev_port_group       *ports;
  55 };
  56
  57 static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
  58 {
  59         struct config_group *group;
  60
  61         if (!item)
  62                 return NULL;
  63
  64         group = container_of(item, struct config_group, cg_item);
  65         return container_of(group, struct cma_dev_port_group, group);
  66 }
  67
  68 static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
  69 {
  70         return !strcmp(dev_name(&ib_dev->dev), cookie);
  71 }
  72
  73 static int cma_configfs_params_get(struct config_item *item,
  74                                    struct cma_device **pcma_dev,
  75                                    struct cma_dev_port_group **pgroup)
  76 {
  77         struct cma_dev_port_group *group = to_dev_port_group(item);
  78         struct cma_device *cma_dev;
  79
  80         if (!group)
  81                 return -ENODEV;
  82
  83         cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
  84                                             group->cma_dev_group->name);
  85         if (!cma_dev)
  86                 return -ENODEV;
  87
  88         *pcma_dev = cma_dev;
  89         *pgroup = group;
  90
  91         return 0;
  92 }
  93
  94 static void cma_configfs_params_put(struct cma_device *cma_dev)
  95 {
  96         cma_dev_put(cma_dev);
  97 }
  98
  99 static ssize_t default_roce_mode_show(struct config_item *item,
 100                                       char *buf)
 101 {
 102         struct cma_device *cma_dev;
 103         struct cma_dev_port_group *group;
 104         int gid_type;
 105         ssize_t ret;
 106
 107         ret = cma_configfs_params_get(item, &cma_dev, &group);
 108         if (ret)
 109                 return ret;
 110
 111         gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
 112         cma_configfs_params_put(cma_dev);
 113
 114         if (gid_type < 0)
 115                 return gid_type;
 116
 117         return sysfs_emit(buf, "%s\n", ib_cache_gid_type_str(gid_type));
 118 }
 119
 120 static ssize_t default_roce_mode_store(struct config_item *item,
 121                                        const char *buf, size_t count)
 122 {
 123         struct cma_device *cma_dev;
 124         struct cma_dev_port_group *group;
 125         int gid_type;
 126         ssize_t ret;
 127
 128         ret = cma_configfs_params_get(item, &cma_dev, &group);
 129         if (ret)
 130                 return ret;
 131
 132         gid_type = ib_cache_gid_parse_type_str(buf);
 133         if (gid_type < 0) {
 134                 cma_configfs_params_put(cma_dev);
 135                 return -EINVAL;
 136         }
 137
 138         ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
 139
 140         cma_configfs_params_put(cma_dev);
 141
 142         return !ret ? strnlen(buf, count) : ret;
 143 }
 144
 145 CONFIGFS_ATTR(, default_roce_mode);
 146
 147 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
 148 {
 149         struct cma_device *cma_dev;
 150         struct cma_dev_port_group *group;
 151         ssize_t ret;
 152         u8 tos;
 153
 154         ret = cma_configfs_params_get(item, &cma_dev, &group);
 155         if (ret)
 156                 return ret;
 157
 158         tos = cma_get_default_roce_tos(cma_dev, group->port_num);
 159         cma_configfs_params_put(cma_dev);
 160
 161         return sysfs_emit(buf, "%u\n", tos);
 162 }
 163
 164 static ssize_t default_roce_tos_store(struct config_item *item,
 165                                       const char *buf, size_t count)
 166 {
 167         struct cma_device *cma_dev;
 168         struct cma_dev_port_group *group;
 169         ssize_t ret;
 170         u8 tos;
 171
 172         ret = kstrtou8(buf, 0, &tos);
 173         if (ret)
 174                 return ret;
 175
 176         ret = cma_configfs_params_get(item, &cma_dev, &group);
 177         if (ret)
 178                 return ret;
 179
 180         ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
 181         cma_configfs_params_put(cma_dev);
 182
 183         return ret ? ret : strnlen(buf, count);
 184 }
 185
 186 CONFIGFS_ATTR(, default_roce_tos);
 187
 188 static struct configfs_attribute *cma_configfs_attributes[] = {
 189         &attr_default_roce_mode,
 190         &attr_default_roce_tos,
 191         NULL,
 192 };
 193
 194 static const struct config_item_type cma_port_group_type = {
 195         .ct_attrs       = cma_configfs_attributes,
 196         .ct_owner       = THIS_MODULE
 197 };
 198
 199 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
 200                           struct cma_device *cma_dev)
 201 {
 202         struct cma_dev_port_group *ports;
 203         struct ib_device *ibdev;
 204         u32 ports_num;
 205         u32 i;
 206
 207         ibdev = cma_get_ib_dev(cma_dev);
 208
 209         if (!ibdev)
 210                 return -ENODEV;
 211
 212         ports_num = ibdev->phys_port_cnt;
 213         ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
 214                         GFP_KERNEL);
 215
 216         if (!ports)
 217                 return -ENOMEM;
 218
 219         for (i = 0; i < ports_num; i++) {
 220                 char port_str[11];
 221
 222                 ports[i].port_num = i + 1;
 223                 snprintf(port_str, sizeof(port_str), "%u", i + 1);
 224                 ports[i].cma_dev_group = cma_dev_group;
 225                 config_group_init_type_name(&ports[i].group,
 226                                             port_str,
 227                                             &cma_port_group_type);
 228                 configfs_add_default_group(&ports[i].group,
 229                                 &cma_dev_group->ports_group);
 230
 231         }
 232         cma_dev_group->ports = ports;
 233         return 0;
 234 }
 235
 236 static void release_cma_dev(struct config_item  *item)
 237 {
 238         struct config_group *group = container_of(item, struct config_group,
 239                                                   cg_item);
 240         struct cma_dev_group *cma_dev_group = container_of(group,
 241                                                            struct cma_dev_group,
 242                                                            device_group);
 243
 244         kfree(cma_dev_group);
 245 };
 246
 247 static void release_cma_ports_group(struct config_item  *item)
 248 {
 249         struct config_group *group = container_of(item, struct config_group,
 250                                                   cg_item);
 251         struct cma_dev_group *cma_dev_group = container_of(group,
 252                                                            struct cma_dev_group,
 253                                                            ports_group);
 254
 255         kfree(cma_dev_group->ports);
 256         cma_dev_group->ports = NULL;
 257 };
 258
 259 static struct configfs_item_operations cma_ports_item_ops = {
 260         .release = release_cma_ports_group
 261 };
 262
 263 static const struct config_item_type cma_ports_group_type = {
 264         .ct_item_ops    = &cma_ports_item_ops,
 265         .ct_owner       = THIS_MODULE
 266 };
 267
 268 static struct configfs_item_operations cma_device_item_ops = {
 269         .release = release_cma_dev
 270 };
 271
 272 static const struct config_item_type cma_device_group_type = {
 273         .ct_item_ops    = &cma_device_item_ops,
 274         .ct_owner       = THIS_MODULE
 275 };
 276
 277 static struct config_group *make_cma_dev(struct config_group *group,
 278                                          const char *name)
 279 {
 280         int err = -ENODEV;
 281         struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
 282                                                                (void *)name);
 283         struct cma_dev_group *cma_dev_group = NULL;
 284
 285         if (!cma_dev)
 286                 goto fail;
 287
 288         cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
 289
 290         if (!cma_dev_group) {
 291                 err = -ENOMEM;
 292                 goto fail;
 293         }
 294
 295         strscpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 296
 297         config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 298                                     &cma_ports_group_type);
 299
 300         err = make_cma_ports(cma_dev_group, cma_dev);
 301         if (err)
 302                 goto fail;
 303
 304         config_group_init_type_name(&cma_dev_group->device_group, name,
 305                                     &cma_device_group_type);
 306         configfs_add_default_group(&cma_dev_group->ports_group,
 307                         &cma_dev_group->device_group);
 308
 309         cma_dev_put(cma_dev);
 310         return &cma_dev_group->device_group;
 311
 312 fail:
 313         if (cma_dev)
 314                 cma_dev_put(cma_dev);
 315         kfree(cma_dev_group);
 316         return ERR_PTR(err);
 317 }
 318
 319 static void drop_cma_dev(struct config_group *cgroup, struct config_item *item)
 320 {
 321         struct config_group *group =
 322                 container_of(item, struct config_group, cg_item);
 323         struct cma_dev_group *cma_dev_group =
 324                 container_of(group, struct cma_dev_group, device_group);
 325
 326         configfs_remove_default_groups(&cma_dev_group->ports_group);
 327         configfs_remove_default_groups(&cma_dev_group->device_group);
 328         config_item_put(item);
 329 }
 330
 331 static struct configfs_group_operations cma_subsys_group_ops = {
 332         .make_group     = make_cma_dev,
 333         .drop_item      = drop_cma_dev,
 334 };
 335
 336 static const struct config_item_type cma_subsys_type = {
 337         .ct_group_ops   = &cma_subsys_group_ops,
 338         .ct_owner       = THIS_MODULE,
 339 };
 340
 341 static struct configfs_subsystem cma_subsys = {
 342         .su_group       = {
 343                 .cg_item        = {
 344                         .ci_namebuf     = "rdma_cm",
 345                         .ci_type        = &cma_subsys_type,
 346                 },
 347         },
 348 };
 349
 350 int __init cma_configfs_init(void)
 351 {
 352         int ret;
 353
 354         config_group_init(&cma_subsys.su_group);
 355         mutex_init(&cma_subsys.su_mutex);
 356         ret = configfs_register_subsystem(&cma_subsys);
 357         if (ret)
 358                 mutex_destroy(&cma_subsys.su_mutex);
 359         return ret;
 360 }
 361
 362 void __exit cma_configfs_exit(void)
 363 {
 364         configfs_unregister_subsystem(&cma_subsys);
 365         mutex_destroy(&cma_subsys.su_mutex);
 366 }