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 } 351