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 } 360