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[10]; 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 } 367