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_deref_dev(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 sprintf(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 = ib_cache_gid_parse_type_str(buf);
 127         ssize_t ret;
 128
 129         if (gid_type < 0)
 130                 return -EINVAL;
 131
 132         ret = cma_configfs_params_get(item, &cma_dev, &group);
 133         if (ret)
 134                 return ret;
 135
 136         ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
 137
 138         cma_configfs_params_put(cma_dev);
 139
 140         return !ret ? strnlen(buf, count) : ret;
 141 }
 142
 143 CONFIGFS_ATTR(, default_roce_mode);
 144
 145 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
 146 {
 147         struct cma_device *cma_dev;
 148         struct cma_dev_port_group *group;
 149         ssize_t ret;
 150         u8 tos;
 151
 152         ret = cma_configfs_params_get(item, &cma_dev, &group);
 153         if (ret)
 154                 return ret;
 155
 156         tos = cma_get_default_roce_tos(cma_dev, group->port_num);
 157         cma_configfs_params_put(cma_dev);
 158
 159         return sprintf(buf, "%u\n", tos);
 160 }
 161
 162 static ssize_t default_roce_tos_store(struct config_item *item,
 163                                       const char *buf, size_t count)
 164 {
 165         struct cma_device *cma_dev;
 166         struct cma_dev_port_group *group;
 167         ssize_t ret;
 168         u8 tos;
 169
 170         ret = kstrtou8(buf, 0, &tos);
 171         if (ret)
 172                 return ret;
 173
 174         ret = cma_configfs_params_get(item, &cma_dev, &group);
 175         if (ret)
 176                 return ret;
 177
 178         ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
 179         cma_configfs_params_put(cma_dev);
 180
 181         return ret ? ret : strnlen(buf, count);
 182 }
 183
 184 CONFIGFS_ATTR(, default_roce_tos);
 185
 186 static struct configfs_attribute *cma_configfs_attributes[] = {
 187         &attr_default_roce_mode,
 188         &attr_default_roce_tos,
 189         NULL,
 190 };
 191
 192 static const struct config_item_type cma_port_group_type = {
 193         .ct_attrs       = cma_configfs_attributes,
 194         .ct_owner       = THIS_MODULE
 195 };
 196
 197 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
 198                           struct cma_device *cma_dev)
 199 {
 200         struct ib_device *ibdev;
 201         unsigned int i;
 202         unsigned int ports_num;
 203         struct cma_dev_port_group *ports;
 204         int err;
 205
 206         ibdev = cma_get_ib_dev(cma_dev);
 207
 208         if (!ibdev)
 209                 return -ENODEV;
 210
 211         ports_num = ibdev->phys_port_cnt;
 212         ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
 213                         GFP_KERNEL);
 214
 215         if (!ports) {
 216                 err = -ENOMEM;
 217                 goto free;
 218         }
 219
 220         for (i = 0; i < ports_num; i++) {
 221                 char port_str[10];
 222
 223                 ports[i].port_num = i + 1;
 224                 snprintf(port_str, sizeof(port_str), "%u", i + 1);
 225                 ports[i].cma_dev_group = cma_dev_group;
 226                 config_group_init_type_name(&ports[i].group,
 227                                             port_str,
 228                                             &cma_port_group_type);
 229                 configfs_add_default_group(&ports[i].group,
 230                                 &cma_dev_group->ports_group);
 231
 232         }
 233         cma_dev_group->ports = ports;
 234
 235         return 0;
 236 free:
 237         kfree(ports);
 238         cma_dev_group->ports = NULL;
 239         return err;
 240 }
 241
 242 static void release_cma_dev(struct config_item  *item)
 243 {
 244         struct config_group *group = container_of(item, struct config_group,
 245                                                   cg_item);
 246         struct cma_dev_group *cma_dev_group = container_of(group,
 247                                                            struct cma_dev_group,
 248                                                            device_group);
 249
 250         kfree(cma_dev_group);
 251 };
 252
 253 static void release_cma_ports_group(struct config_item  *item)
 254 {
 255         struct config_group *group = container_of(item, struct config_group,
 256                                                   cg_item);
 257         struct cma_dev_group *cma_dev_group = container_of(group,
 258                                                            struct cma_dev_group,
 259                                                            ports_group);
 260
 261         kfree(cma_dev_group->ports);
 262         cma_dev_group->ports = NULL;
 263 };
 264
 265 static struct configfs_item_operations cma_ports_item_ops = {
 266         .release = release_cma_ports_group
 267 };
 268
 269 static const struct config_item_type cma_ports_group_type = {
 270         .ct_item_ops    = &cma_ports_item_ops,
 271         .ct_owner       = THIS_MODULE
 272 };
 273
 274 static struct configfs_item_operations cma_device_item_ops = {
 275         .release = release_cma_dev
 276 };
 277
 278 static const struct config_item_type cma_device_group_type = {
 279         .ct_item_ops    = &cma_device_item_ops,
 280         .ct_owner       = THIS_MODULE
 281 };
 282
 283 static struct config_group *make_cma_dev(struct config_group *group,
 284                                          const char *name)
 285 {
 286         int err = -ENODEV;
 287         struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
 288                                                                (void *)name);
 289         struct cma_dev_group *cma_dev_group = NULL;
 290
 291         if (!cma_dev)
 292                 goto fail;
 293
 294         cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
 295
 296         if (!cma_dev_group) {
 297                 err = -ENOMEM;
 298                 goto fail;
 299         }
 300
 301         strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 302
 303         config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 304                                     &cma_ports_group_type);
 305
 306         err = make_cma_ports(cma_dev_group, cma_dev);
 307         if (err)
 308                 goto fail;
 309
 310         config_group_init_type_name(&cma_dev_group->device_group, name,
 311                                     &cma_device_group_type);
 312         configfs_add_default_group(&cma_dev_group->ports_group,
 313                         &cma_dev_group->device_group);
 314
 315         cma_deref_dev(cma_dev);
 316         return &cma_dev_group->device_group;
 317
 318 fail:
 319         if (cma_dev)
 320                 cma_deref_dev(cma_dev);
 321         kfree(cma_dev_group);
 322         return ERR_PTR(err);
 323 }
 324
 325 static struct configfs_group_operations cma_subsys_group_ops = {
 326         .make_group     = make_cma_dev,
 327 };
 328
 329 static const struct config_item_type cma_subsys_type = {
 330         .ct_group_ops   = &cma_subsys_group_ops,
 331         .ct_owner       = THIS_MODULE,
 332 };
 333
 334 static struct configfs_subsystem cma_subsys = {
 335         .su_group       = {
 336                 .cg_item        = {
 337                         .ci_namebuf     = "rdma_cm",
 338                         .ci_type        = &cma_subsys_type,
 339                 },
 340         },
 341 };
 342
 343 int __init cma_configfs_init(void)
 344 {
 345         int ret;
 346
 347         config_group_init(&cma_subsys.su_group);
 348         mutex_init(&cma_subsys.su_mutex);
 349         ret = configfs_register_subsystem(&cma_subsys);
 350         if (ret)
 351                 mutex_destroy(&cma_subsys.su_mutex);
 352         return ret;
 353 }
 354
 355 void __exit cma_configfs_exit(void)
 356 {
 357         configfs_unregister_subsystem(&cma_subsys);
 358         mutex_destroy(&cma_subsys.su_mutex);
 359 }