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 struct configfs_attribute *cma_configfs_attributes[] = {
 143         &attr_default_roce_mode,
 144         NULL,
 145 };
 146
 147 static struct config_item_type cma_port_group_type = {
 148         .ct_attrs       = cma_configfs_attributes,
 149         .ct_owner       = THIS_MODULE
 150 };
 151
 152 static int make_cma_ports(struct cma_dev_group *cma_dev_group,
 153                           struct cma_device *cma_dev)
 154 {
 155         struct ib_device *ibdev;
 156         unsigned int i;
 157         unsigned int ports_num;
 158         struct cma_dev_port_group *ports;
 159         int err;
 160
 161         ibdev = cma_get_ib_dev(cma_dev);
 162
 163         if (!ibdev)
 164                 return -ENODEV;
 165
 166         ports_num = ibdev->phys_port_cnt;
 167         ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
 168                         GFP_KERNEL);
 169
 170         if (!ports) {
 171                 err = -ENOMEM;
 172                 goto free;
 173         }
 174
 175         for (i = 0; i < ports_num; i++) {
 176                 char port_str[10];
 177
 178                 ports[i].port_num = i + 1;
 179                 snprintf(port_str, sizeof(port_str), "%u", i + 1);
 180                 ports[i].cma_dev_group = cma_dev_group;
 181                 config_group_init_type_name(&ports[i].group,
 182                                             port_str,
 183                                             &cma_port_group_type);
 184                 configfs_add_default_group(&ports[i].group,
 185                                 &cma_dev_group->ports_group);
 186
 187         }
 188         cma_dev_group->ports = ports;
 189
 190         return 0;
 191 free:
 192         kfree(ports);
 193         cma_dev_group->ports = NULL;
 194         return err;
 195 }
 196
 197 static void release_cma_dev(struct config_item  *item)
 198 {
 199         struct config_group *group = container_of(item, struct config_group,
 200                                                   cg_item);
 201         struct cma_dev_group *cma_dev_group = container_of(group,
 202                                                            struct cma_dev_group,
 203                                                            device_group);
 204
 205         kfree(cma_dev_group);
 206 };
 207
 208 static void release_cma_ports_group(struct config_item  *item)
 209 {
 210         struct config_group *group = container_of(item, struct config_group,
 211                                                   cg_item);
 212         struct cma_dev_group *cma_dev_group = container_of(group,
 213                                                            struct cma_dev_group,
 214                                                            ports_group);
 215
 216         kfree(cma_dev_group->ports);
 217         cma_dev_group->ports = NULL;
 218 };
 219
 220 static struct configfs_item_operations cma_ports_item_ops = {
 221         .release = release_cma_ports_group
 222 };
 223
 224 static struct config_item_type cma_ports_group_type = {
 225         .ct_item_ops    = &cma_ports_item_ops,
 226         .ct_owner       = THIS_MODULE
 227 };
 228
 229 static struct configfs_item_operations cma_device_item_ops = {
 230         .release = release_cma_dev
 231 };
 232
 233 static struct config_item_type cma_device_group_type = {
 234         .ct_item_ops    = &cma_device_item_ops,
 235         .ct_owner       = THIS_MODULE
 236 };
 237
 238 static struct config_group *make_cma_dev(struct config_group *group,
 239                                          const char *name)
 240 {
 241         int err = -ENODEV;
 242         struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
 243                                                                (void *)name);
 244         struct cma_dev_group *cma_dev_group = NULL;
 245
 246         if (!cma_dev)
 247                 goto fail;
 248
 249         cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
 250
 251         if (!cma_dev_group) {
 252                 err = -ENOMEM;
 253                 goto fail;
 254         }
 255
 256         strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 257
 258         config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 259                                     &cma_ports_group_type);
 260
 261         err = make_cma_ports(cma_dev_group, cma_dev);
 262         if (err)
 263                 goto fail;
 264
 265         config_group_init_type_name(&cma_dev_group->device_group, name,
 266                                     &cma_device_group_type);
 267         configfs_add_default_group(&cma_dev_group->ports_group,
 268                         &cma_dev_group->device_group);
 269
 270         cma_deref_dev(cma_dev);
 271         return &cma_dev_group->device_group;
 272
 273 fail:
 274         if (cma_dev)
 275                 cma_deref_dev(cma_dev);
 276         kfree(cma_dev_group);
 277         return ERR_PTR(err);
 278 }
 279
 280 static struct configfs_group_operations cma_subsys_group_ops = {
 281         .make_group     = make_cma_dev,
 282 };
 283
 284 static struct config_item_type cma_subsys_type = {
 285         .ct_group_ops   = &cma_subsys_group_ops,
 286         .ct_owner       = THIS_MODULE,
 287 };
 288
 289 static struct configfs_subsystem cma_subsys = {
 290         .su_group       = {
 291                 .cg_item        = {
 292                         .ci_namebuf     = "rdma_cm",
 293                         .ci_type        = &cma_subsys_type,
 294                 },
 295         },
 296 };
 297
 298 int __init cma_configfs_init(void)
 299 {
 300         config_group_init(&cma_subsys.su_group);
 301         mutex_init(&cma_subsys.su_mutex);
 302         return configfs_register_subsystem(&cma_subsys);
 303 }
 304
 305 void __exit cma_configfs_exit(void)
 306 {
 307         configfs_unregister_subsystem(&cma_subsys);
 308 }