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/module.h>
  34 #include <linux/configfs.h>
  35 #include <rdma/ib_verbs.h>
  36 #include <rdma/rdma_cm.h>
  37
  38 #include "core_priv.h"
  39 #include "cma_priv.h"
  40
  41 struct cma_device;
  42
  43 struct cma_dev_group;
  44
  45 struct cma_dev_port_group {
  46         unsigned int            port_num;
  47         struct cma_dev_group    *cma_dev_group;
  48         struct config_group     group;
  49 };
  50
  51 struct cma_dev_group {
  52         char                            name[IB_DEVICE_NAME_MAX];
  53         struct config_group             device_group;
  54         struct config_group             ports_group;
  55         struct cma_dev_port_group       *ports;
  56 };
  57
  58 static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
  59 {
  60         struct config_group *group;
  61
  62         if (!item)
  63                 return NULL;
  64
  65         group = container_of(item, struct config_group, cg_item);
  66         return container_of(group, struct cma_dev_port_group, group);
  67 }
  68
  69 static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
  70 {
  71         return !strcmp(dev_name(&ib_dev->dev), cookie);
  72 }
  73
  74 static int cma_configfs_params_get(struct config_item *item,
  75                                    struct cma_device **pcma_dev,
  76                                    struct cma_dev_port_group **pgroup)
  77 {
  78         struct cma_dev_port_group *group = to_dev_port_group(item);
  79         struct cma_device *cma_dev;
  80
  81         if (!group)
  82                 return -ENODEV;
  83
  84         cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
  85                                             group->cma_dev_group->name);
  86         if (!cma_dev)
  87                 return -ENODEV;
  88
  89         *pcma_dev = cma_dev;
  90         *pgroup = group;
  91
  92         return 0;
  93 }
  94
  95 static void cma_configfs_params_put(struct cma_device *cma_dev)
  96 {
  97         cma_dev_put(cma_dev);
  98 }
  99
 100 static ssize_t default_roce_mode_show(struct config_item *item,
 101                                       char *buf)
 102 {
 103         struct cma_device *cma_dev;
 104         struct cma_dev_port_group *group;
 105         int gid_type;
 106         ssize_t ret;
 107
 108         ret = cma_configfs_params_get(item, &cma_dev, &group);
 109         if (ret)
 110                 return ret;
 111
 112         gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
 113         cma_configfs_params_put(cma_dev);
 114
 115         if (gid_type < 0)
 116                 return gid_type;
 117
 118         return sysfs_emit(buf, "%s\n", ib_cache_gid_type_str(gid_type));
 119 }
 120
 121 static ssize_t default_roce_mode_store(struct config_item *item,
 122                                        const char *buf, size_t count)
 123 {
 124         struct cma_device *cma_dev;
 125         struct cma_dev_port_group *group;
 126         int gid_type;
 127         ssize_t ret;
 128
 129         ret = cma_configfs_params_get(item, &cma_dev, &group);
 130         if (ret)
 131                 return ret;
 132
 133         gid_type = ib_cache_gid_parse_type_str(buf);
 134         if (gid_type < 0)
 135                 return -EINVAL;
 136
 137         ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
 138
 139         cma_configfs_params_put(cma_dev);
 140
 141         return !ret ? strnlen(buf, count) : ret;
 142 }
 143
 144 CONFIGFS_ATTR(, default_roce_mode);
 145
 146 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
 147 {
 148         struct cma_device *cma_dev;
 149         struct cma_dev_port_group *group;
 150         ssize_t ret;
 151         u8 tos;
 152
 153         ret = cma_configfs_params_get(item, &cma_dev, &group);
 154         if (ret)
 155                 return ret;
 156
 157         tos = cma_get_default_roce_tos(cma_dev, group->port_num);
 158         cma_configfs_params_put(cma_dev);
 159
 160         return sysfs_emit(buf, "%u\n", tos);
 161 }
 162
 163 static ssize_t default_roce_tos_store(struct config_item *item,
 164                                       const char *buf, size_t count)
 165 {
 166         struct cma_device *cma_dev;
 167         struct cma_dev_port_group *group;
 168         ssize_t ret;
 169         u8 tos;
 170
 171         ret = kstrtou8(buf, 0, &tos);
 172         if (ret)
 173                 return ret;
 174
 175         ret = cma_configfs_params_get(item, &cma_dev, &group);
 176         if (ret)
 177                 return ret;
 178
 179         ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
 180         cma_configfs_params_put(cma_dev);
 181
 182         return ret ? ret : strnlen(buf, count);
 183 }
 184
 185 CONFIGFS_ATTR(, default_roce_tos);
 186
 187 static struct configfs_attribute *cma_configfs_attributes[] = {
 188         &attr_default_roce_mode,
 189         &attr_default_roce_tos,
 190         NULL,
 191 };
 192
 193 static const struct config_item_type cma_port_group_type = {
 194         .ct_attrs       = cma_configfs_attributes,
 195         .ct_owner       = THIS_MODULE
 196 };
 197
 198 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
 199                           struct cma_device *cma_dev)
 200 {
 201         struct ib_device *ibdev;
 202         unsigned int i;
 203         unsigned int ports_num;
 204         struct cma_dev_port_group *ports;
 205         int err;
 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                 err = -ENOMEM;
 218                 goto free;
 219         }
 220
 221         for (i = 0; i < ports_num; i++) {
 222                 char port_str[10];
 223
 224                 ports[i].port_num = i + 1;
 225                 snprintf(port_str, sizeof(port_str), "%u", i + 1);
 226                 ports[i].cma_dev_group = cma_dev_group;
 227                 config_group_init_type_name(&ports[i].group,
 228                                             port_str,
 229                                             &cma_port_group_type);
 230                 configfs_add_default_group(&ports[i].group,
 231                                 &cma_dev_group->ports_group);
 232
 233         }
 234         cma_dev_group->ports = ports;
 235
 236         return 0;
 237 free:
 238         kfree(ports);
 239         cma_dev_group->ports = NULL;
 240         return err;
 241 }
 242
 243 static void release_cma_dev(struct config_item  *item)
 244 {
 245         struct config_group *group = container_of(item, struct config_group,
 246                                                   cg_item);
 247         struct cma_dev_group *cma_dev_group = container_of(group,
 248                                                            struct cma_dev_group,
 249                                                            device_group);
 250
 251         kfree(cma_dev_group);
 252 };
 253
 254 static void release_cma_ports_group(struct config_item  *item)
 255 {
 256         struct config_group *group = container_of(item, struct config_group,
 257                                                   cg_item);
 258         struct cma_dev_group *cma_dev_group = container_of(group,
 259                                                            struct cma_dev_group,
 260                                                            ports_group);
 261
 262         kfree(cma_dev_group->ports);
 263         cma_dev_group->ports = NULL;
 264 };
 265
 266 static struct configfs_item_operations cma_ports_item_ops = {
 267         .release = release_cma_ports_group
 268 };
 269
 270 static const struct config_item_type cma_ports_group_type = {
 271         .ct_item_ops    = &cma_ports_item_ops,
 272         .ct_owner       = THIS_MODULE
 273 };
 274
 275 static struct configfs_item_operations cma_device_item_ops = {
 276         .release = release_cma_dev
 277 };
 278
 279 static const struct config_item_type cma_device_group_type = {
 280         .ct_item_ops    = &cma_device_item_ops,
 281         .ct_owner       = THIS_MODULE
 282 };
 283
 284 static struct config_group *make_cma_dev(struct config_group *group,
 285                                          const char *name)
 286 {
 287         int err = -ENODEV;
 288         struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
 289                                                                (void *)name);
 290         struct cma_dev_group *cma_dev_group = NULL;
 291
 292         if (!cma_dev)
 293                 goto fail;
 294
 295         cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
 296
 297         if (!cma_dev_group) {
 298                 err = -ENOMEM;
 299                 goto fail;
 300         }
 301
 302         strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 303
 304         config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 305                                     &cma_ports_group_type);
 306
 307         err = make_cma_ports(cma_dev_group, cma_dev);
 308         if (err)
 309                 goto fail;
 310
 311         config_group_init_type_name(&cma_dev_group->device_group, name,
 312                                     &cma_device_group_type);
 313         configfs_add_default_group(&cma_dev_group->ports_group,
 314                         &cma_dev_group->device_group);
 315
 316         cma_dev_put(cma_dev);
 317         return &cma_dev_group->device_group;
 318
 319 fail:
 320         if (cma_dev)
 321                 cma_dev_put(cma_dev);
 322         kfree(cma_dev_group);
 323         return ERR_PTR(err);
 324 }
 325
 326 static void drop_cma_dev(struct config_group *cgroup, struct config_item *item)
 327 {
 328         struct config_group *group =
 329                 container_of(item, struct config_group, cg_item);
 330         struct cma_dev_group *cma_dev_group =
 331                 container_of(group, struct cma_dev_group, device_group);
 332
 333         configfs_remove_default_groups(&cma_dev_group->ports_group);
 334         configfs_remove_default_groups(&cma_dev_group->device_group);
 335         config_item_put(item);
 336 }
 337
 338 static struct configfs_group_operations cma_subsys_group_ops = {
 339         .make_group     = make_cma_dev,
 340         .drop_item      = drop_cma_dev,
 341 };
 342
 343 static const struct config_item_type cma_subsys_type = {
 344         .ct_group_ops   = &cma_subsys_group_ops,
 345         .ct_owner       = THIS_MODULE,
 346 };
 347
 348 static struct configfs_subsystem cma_subsys = {
 349         .su_group       = {
 350                 .cg_item        = {
 351                         .ci_namebuf     = "rdma_cm",
 352                         .ci_type        = &cma_subsys_type,
 353                 },
 354         },
 355 };
 356
 357 int __init cma_configfs_init(void)
 358 {
 359         int ret;
 360
 361         config_group_init(&cma_subsys.su_group);
 362         mutex_init(&cma_subsys.su_mutex);
 363         ret = configfs_register_subsystem(&cma_subsys);
 364         if (ret)
 365                 mutex_destroy(&cma_subsys.su_mutex);
 366         return ret;
 367 }
 368
 369 void __exit cma_configfs_exit(void)
 370 {
 371         configfs_unregister_subsystem(&cma_subsys);
 372         mutex_destroy(&cma_subsys.su_mutex);
 373 }