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 "core_priv.h"
  37
  38 struct cma_device;
  39
  40 struct cma_dev_group;
  41
  42 struct cma_dev_port_group {
  43         unsigned int            port_num;
  44         struct cma_dev_group    *cma_dev_group;
  45         struct config_group     group;
  46 };
  47
  48 struct cma_dev_group {
  49         char                            name[IB_DEVICE_NAME_MAX];
  50         struct config_group             device_group;
  51         struct config_group             ports_group;
  52         struct cma_dev_port_group       *ports;
  53 };
  54
  55 static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
  56 {
  57         struct config_group *group;
  58
  59         if (!item)
  60                 return NULL;
  61
  62         group = container_of(item, struct config_group, cg_item);
  63         return container_of(group, struct cma_dev_port_group, group);
  64 }
  65
  66 static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
  67 {
  68         return !strcmp(ib_dev->name, cookie);
  69 }
  70
  71 static int cma_configfs_params_get(struct config_item *item,
  72                                    struct cma_device **pcma_dev,
  73                                    struct cma_dev_port_group **pgroup)
  74 {
  75         struct cma_dev_port_group *group = to_dev_port_group(item);
  76         struct cma_device *cma_dev;
  77
  78         if (!group)
  79                 return -ENODEV;
  80
  81         cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
  82                                             group->cma_dev_group->name);
  83         if (!cma_dev)
  84                 return -ENODEV;
  85
  86         *pcma_dev = cma_dev;
  87         *pgroup = group;
  88
  89         return 0;
  90 }
  91
  92 static void cma_configfs_params_put(struct cma_device *cma_dev)
  93 {
  94         cma_deref_dev(cma_dev);
  95 }
  96
  97 static ssize_t default_roce_mode_show(struct config_item *item,
  98                                       char *buf)
  99 {
 100         struct cma_device *cma_dev;
 101         struct cma_dev_port_group *group;
 102         int gid_type;
 103         ssize_t ret;
 104
 105         ret = cma_configfs_params_get(item, &cma_dev, &group);
 106         if (ret)
 107                 return ret;
 108
 109         gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
 110         cma_configfs_params_put(cma_dev);
 111
 112         if (gid_type < 0)
 113                 return gid_type;
 114
 115         return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
 116 }
 117
 118 static ssize_t default_roce_mode_store(struct config_item *item,
 119                                        const char *buf, size_t count)
 120 {
 121         struct cma_device *cma_dev;
 122         struct cma_dev_port_group *group;
 123         int gid_type = ib_cache_gid_parse_type_str(buf);
 124         ssize_t ret;
 125
 126         if (gid_type < 0)
 127                 return -EINVAL;
 128
 129         ret = cma_configfs_params_get(item, &cma_dev, &group);
 130         if (ret)
 131                 return ret;
 132
 133         ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
 134
 135         cma_configfs_params_put(cma_dev);
 136
 137         return !ret ? strnlen(buf, count) : ret;
 138 }
 139
 140 CONFIGFS_ATTR(, default_roce_mode);
 141
 142 static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
 143 {
 144         struct cma_device *cma_dev;
 145         struct cma_dev_port_group *group;
 146         ssize_t ret;
 147         u8 tos;
 148
 149         ret = cma_configfs_params_get(item, &cma_dev, &group);
 150         if (ret)
 151                 return ret;
 152
 153         tos = cma_get_default_roce_tos(cma_dev, group->port_num);
 154         cma_configfs_params_put(cma_dev);
 155
 156         return sprintf(buf, "%u\n", tos);
 157 }
 158
 159 static ssize_t default_roce_tos_store(struct config_item *item,
 160                                       const char *buf, size_t count)
 161 {
 162         struct cma_device *cma_dev;
 163         struct cma_dev_port_group *group;
 164         ssize_t ret;
 165         u8 tos;
 166
 167         ret = kstrtou8(buf, 0, &tos);
 168         if (ret)
 169                 return ret;
 170
 171         ret = cma_configfs_params_get(item, &cma_dev, &group);
 172         if (ret)
 173                 return ret;
 174
 175         ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
 176         cma_configfs_params_put(cma_dev);
 177
 178         return ret ? ret : strnlen(buf, count);
 179 }
 180
 181 CONFIGFS_ATTR(, default_roce_tos);
 182
 183 static struct configfs_attribute *cma_configfs_attributes[] = {
 184         &attr_default_roce_mode,
 185         &attr_default_roce_tos,
 186         NULL,
 187 };
 188
 189 static const struct config_item_type cma_port_group_type = {
 190         .ct_attrs       = cma_configfs_attributes,
 191         .ct_owner       = THIS_MODULE
 192 };
 193
 194 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
 195                           struct cma_device *cma_dev)
 196 {
 197         struct ib_device *ibdev;
 198         unsigned int i;
 199         unsigned int ports_num;
 200         struct cma_dev_port_group *ports;
 201         int err;
 202
 203         ibdev = cma_get_ib_dev(cma_dev);
 204
 205         if (!ibdev)
 206                 return -ENODEV;
 207
 208         ports_num = ibdev->phys_port_cnt;
 209         ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
 210                         GFP_KERNEL);
 211
 212         if (!ports) {
 213                 err = -ENOMEM;
 214                 goto free;
 215         }
 216
 217         for (i = 0; i < ports_num; i++) {
 218                 char port_str[10];
 219
 220                 ports[i].port_num = i + 1;
 221                 snprintf(port_str, sizeof(port_str), "%u", i + 1);
 222                 ports[i].cma_dev_group = cma_dev_group;
 223                 config_group_init_type_name(&ports[i].group,
 224                                             port_str,
 225                                             &cma_port_group_type);
 226                 configfs_add_default_group(&ports[i].group,
 227                                 &cma_dev_group->ports_group);
 228
 229         }
 230         cma_dev_group->ports = ports;
 231
 232         return 0;
 233 free:
 234         kfree(ports);
 235         cma_dev_group->ports = NULL;
 236         return err;
 237 }
 238
 239 static void release_cma_dev(struct config_item  *item)
 240 {
 241         struct config_group *group = container_of(item, struct config_group,
 242                                                   cg_item);
 243         struct cma_dev_group *cma_dev_group = container_of(group,
 244                                                            struct cma_dev_group,
 245                                                            device_group);
 246
 247         kfree(cma_dev_group);
 248 };
 249
 250 static void release_cma_ports_group(struct config_item  *item)
 251 {
 252         struct config_group *group = container_of(item, struct config_group,
 253                                                   cg_item);
 254         struct cma_dev_group *cma_dev_group = container_of(group,
 255                                                            struct cma_dev_group,
 256                                                            ports_group);
 257
 258         kfree(cma_dev_group->ports);
 259         cma_dev_group->ports = NULL;
 260 };
 261
 262 static struct configfs_item_operations cma_ports_item_ops = {
 263         .release = release_cma_ports_group
 264 };
 265
 266 static const struct config_item_type cma_ports_group_type = {
 267         .ct_item_ops    = &cma_ports_item_ops,
 268         .ct_owner       = THIS_MODULE
 269 };
 270
 271 static struct configfs_item_operations cma_device_item_ops = {
 272         .release = release_cma_dev
 273 };
 274
 275 static const struct config_item_type cma_device_group_type = {
 276         .ct_item_ops    = &cma_device_item_ops,
 277         .ct_owner       = THIS_MODULE
 278 };
 279
 280 static struct config_group *make_cma_dev(struct config_group *group,
 281                                          const char *name)
 282 {
 283         int err = -ENODEV;
 284         struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
 285                                                                (void *)name);
 286         struct cma_dev_group *cma_dev_group = NULL;
 287
 288         if (!cma_dev)
 289                 goto fail;
 290
 291         cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
 292
 293         if (!cma_dev_group) {
 294                 err = -ENOMEM;
 295                 goto fail;
 296         }
 297
 298         strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 299
 300         config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 301                                     &cma_ports_group_type);
 302
 303         err = make_cma_ports(cma_dev_group, cma_dev);
 304         if (err)
 305                 goto fail;
 306
 307         config_group_init_type_name(&cma_dev_group->device_group, name,
 308                                     &cma_device_group_type);
 309         configfs_add_default_group(&cma_dev_group->ports_group,
 310                         &cma_dev_group->device_group);
 311
 312         cma_deref_dev(cma_dev);
 313         return &cma_dev_group->device_group;
 314
 315 fail:
 316         if (cma_dev)
 317                 cma_deref_dev(cma_dev);
 318         kfree(cma_dev_group);
 319         return ERR_PTR(err);
 320 }
 321
 322 static struct configfs_group_operations cma_subsys_group_ops = {
 323         .make_group     = make_cma_dev,
 324 };
 325
 326 static const struct config_item_type cma_subsys_type = {
 327         .ct_group_ops   = &cma_subsys_group_ops,
 328         .ct_owner       = THIS_MODULE,
 329 };
 330
 331 static struct configfs_subsystem cma_subsys = {
 332         .su_group       = {
 333                 .cg_item        = {
 334                         .ci_namebuf     = "rdma_cm",
 335                         .ci_type        = &cma_subsys_type,
 336                 },
 337         },
 338 };
 339
 340 int __init cma_configfs_init(void)
 341 {
 342         config_group_init(&cma_subsys.su_group);
 343         mutex_init(&cma_subsys.su_mutex);
 344         return configfs_register_subsystem(&cma_subsys);
 345 }
 346
 347 void __exit cma_configfs_exit(void)
 348 {
 349         configfs_unregister_subsystem(&cma_subsys);
 350 }