1 /* 2 * Copyright (c) 2017 Mellanox Technologies. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. Neither the names of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * Alternatively, this software may be distributed under the terms of the 17 * GNU General Public License ("GPL") version 2 as published by the Free 18 * Software Foundation. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <linux/module.h> 34 #include <linux/pid.h> 35 #include <linux/pid_namespace.h> 36 #include <net/netlink.h> 37 #include <rdma/rdma_netlink.h> 38 39 #include "core_priv.h" 40 41 static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = { 42 [RDMA_NLDEV_ATTR_DEV_INDEX] = { .type = NLA_U32 }, 43 [RDMA_NLDEV_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, 44 .len = IB_DEVICE_NAME_MAX - 1}, 45 [RDMA_NLDEV_ATTR_PORT_INDEX] = { .type = NLA_U32 }, 46 [RDMA_NLDEV_ATTR_FW_VERSION] = { .type = NLA_NUL_STRING, 47 .len = IB_FW_VERSION_NAME_MAX - 1}, 48 [RDMA_NLDEV_ATTR_NODE_GUID] = { .type = NLA_U64 }, 49 [RDMA_NLDEV_ATTR_SYS_IMAGE_GUID] = { .type = NLA_U64 }, 50 [RDMA_NLDEV_ATTR_SUBNET_PREFIX] = { .type = NLA_U64 }, 51 [RDMA_NLDEV_ATTR_LID] = { .type = NLA_U32 }, 52 [RDMA_NLDEV_ATTR_SM_LID] = { .type = NLA_U32 }, 53 [RDMA_NLDEV_ATTR_LMC] = { .type = NLA_U8 }, 54 [RDMA_NLDEV_ATTR_PORT_STATE] = { .type = NLA_U8 }, 55 [RDMA_NLDEV_ATTR_PORT_PHYS_STATE] = { .type = NLA_U8 }, 56 [RDMA_NLDEV_ATTR_DEV_NODE_TYPE] = { .type = NLA_U8 }, 57 [RDMA_NLDEV_ATTR_RES_SUMMARY] = { .type = NLA_NESTED }, 58 [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY] = { .type = NLA_NESTED }, 59 [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_NAME] = { .type = NLA_NUL_STRING, 60 .len = 16 }, 61 [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR] = { .type = NLA_U64 }, 62 [RDMA_NLDEV_ATTR_RES_QP] = { .type = NLA_NESTED }, 63 [RDMA_NLDEV_ATTR_RES_QP_ENTRY] = { .type = NLA_NESTED }, 64 [RDMA_NLDEV_ATTR_RES_LQPN] = { .type = NLA_U32 }, 65 [RDMA_NLDEV_ATTR_RES_RQPN] = { .type = NLA_U32 }, 66 [RDMA_NLDEV_ATTR_RES_RQ_PSN] = { .type = NLA_U32 }, 67 [RDMA_NLDEV_ATTR_RES_SQ_PSN] = { .type = NLA_U32 }, 68 [RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE] = { .type = NLA_U8 }, 69 [RDMA_NLDEV_ATTR_RES_TYPE] = { .type = NLA_U8 }, 70 [RDMA_NLDEV_ATTR_RES_STATE] = { .type = NLA_U8 }, 71 [RDMA_NLDEV_ATTR_RES_PID] = { .type = NLA_U32 }, 72 [RDMA_NLDEV_ATTR_RES_KERN_NAME] = { .type = NLA_NUL_STRING, 73 .len = TASK_COMM_LEN }, 74 }; 75 76 static int fill_nldev_handle(struct sk_buff *msg, struct ib_device *device) 77 { 78 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_DEV_INDEX, device->index)) 79 return -EMSGSIZE; 80 if (nla_put_string(msg, RDMA_NLDEV_ATTR_DEV_NAME, device->name)) 81 return -EMSGSIZE; 82 83 return 0; 84 } 85 86 static int fill_dev_info(struct sk_buff *msg, struct ib_device *device) 87 { 88 char fw[IB_FW_VERSION_NAME_MAX]; 89 90 if (fill_nldev_handle(msg, device)) 91 return -EMSGSIZE; 92 93 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, rdma_end_port(device))) 94 return -EMSGSIZE; 95 96 BUILD_BUG_ON(sizeof(device->attrs.device_cap_flags) != sizeof(u64)); 97 if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_CAP_FLAGS, 98 device->attrs.device_cap_flags, 0)) 99 return -EMSGSIZE; 100 101 ib_get_device_fw_str(device, fw); 102 /* Device without FW has strlen(fw) */ 103 if (strlen(fw) && nla_put_string(msg, RDMA_NLDEV_ATTR_FW_VERSION, fw)) 104 return -EMSGSIZE; 105 106 if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_NODE_GUID, 107 be64_to_cpu(device->node_guid), 0)) 108 return -EMSGSIZE; 109 if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_SYS_IMAGE_GUID, 110 be64_to_cpu(device->attrs.sys_image_guid), 0)) 111 return -EMSGSIZE; 112 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_DEV_NODE_TYPE, device->node_type)) 113 return -EMSGSIZE; 114 return 0; 115 } 116 117 static int fill_port_info(struct sk_buff *msg, 118 struct ib_device *device, u32 port) 119 { 120 struct ib_port_attr attr; 121 int ret; 122 123 if (fill_nldev_handle(msg, device)) 124 return -EMSGSIZE; 125 126 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, port)) 127 return -EMSGSIZE; 128 129 ret = ib_query_port(device, port, &attr); 130 if (ret) 131 return ret; 132 133 BUILD_BUG_ON(sizeof(attr.port_cap_flags) > sizeof(u64)); 134 if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_CAP_FLAGS, 135 (u64)attr.port_cap_flags, 0)) 136 return -EMSGSIZE; 137 if (rdma_protocol_ib(device, port) && 138 nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_SUBNET_PREFIX, 139 attr.subnet_prefix, 0)) 140 return -EMSGSIZE; 141 if (rdma_protocol_ib(device, port)) { 142 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_LID, attr.lid)) 143 return -EMSGSIZE; 144 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_SM_LID, attr.sm_lid)) 145 return -EMSGSIZE; 146 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_LMC, attr.lmc)) 147 return -EMSGSIZE; 148 } 149 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_PORT_STATE, attr.state)) 150 return -EMSGSIZE; 151 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_PORT_PHYS_STATE, attr.phys_state)) 152 return -EMSGSIZE; 153 return 0; 154 } 155 156 static int fill_res_info_entry(struct sk_buff *msg, 157 const char *name, u64 curr) 158 { 159 struct nlattr *entry_attr; 160 161 entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY); 162 if (!entry_attr) 163 return -EMSGSIZE; 164 165 if (nla_put_string(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_NAME, name)) 166 goto err; 167 if (nla_put_u64_64bit(msg, 168 RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR, curr, 0)) 169 goto err; 170 171 nla_nest_end(msg, entry_attr); 172 return 0; 173 174 err: 175 nla_nest_cancel(msg, entry_attr); 176 return -EMSGSIZE; 177 } 178 179 static int fill_res_info(struct sk_buff *msg, struct ib_device *device) 180 { 181 static const char * const names[RDMA_RESTRACK_MAX] = { 182 [RDMA_RESTRACK_PD] = "pd", 183 [RDMA_RESTRACK_CQ] = "cq", 184 [RDMA_RESTRACK_QP] = "qp", 185 }; 186 187 struct rdma_restrack_root *res = &device->res; 188 struct nlattr *table_attr; 189 int ret, i, curr; 190 191 if (fill_nldev_handle(msg, device)) 192 return -EMSGSIZE; 193 194 table_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_SUMMARY); 195 if (!table_attr) 196 return -EMSGSIZE; 197 198 for (i = 0; i < RDMA_RESTRACK_MAX; i++) { 199 if (!names[i]) 200 continue; 201 curr = rdma_restrack_count(res, i, task_active_pid_ns(current)); 202 ret = fill_res_info_entry(msg, names[i], curr); 203 if (ret) 204 goto err; 205 } 206 207 nla_nest_end(msg, table_attr); 208 return 0; 209 210 err: 211 nla_nest_cancel(msg, table_attr); 212 return ret; 213 } 214 215 static int fill_res_qp_entry(struct sk_buff *msg, 216 struct ib_qp *qp, uint32_t port) 217 { 218 struct rdma_restrack_entry *res = &qp->res; 219 struct ib_qp_init_attr qp_init_attr; 220 struct nlattr *entry_attr; 221 struct ib_qp_attr qp_attr; 222 int ret; 223 224 ret = ib_query_qp(qp, &qp_attr, 0, &qp_init_attr); 225 if (ret) 226 return ret; 227 228 if (port && port != qp_attr.port_num) 229 return 0; 230 231 entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_QP_ENTRY); 232 if (!entry_attr) 233 goto out; 234 235 /* In create_qp() port is not set yet */ 236 if (qp_attr.port_num && 237 nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, qp_attr.port_num)) 238 goto err; 239 240 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_LQPN, qp->qp_num)) 241 goto err; 242 if (qp->qp_type == IB_QPT_RC || qp->qp_type == IB_QPT_UC) { 243 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_RQPN, 244 qp_attr.dest_qp_num)) 245 goto err; 246 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_RQ_PSN, 247 qp_attr.rq_psn)) 248 goto err; 249 } 250 251 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_SQ_PSN, qp_attr.sq_psn)) 252 goto err; 253 254 if (qp->qp_type == IB_QPT_RC || qp->qp_type == IB_QPT_UC || 255 qp->qp_type == IB_QPT_XRC_INI || qp->qp_type == IB_QPT_XRC_TGT) { 256 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE, 257 qp_attr.path_mig_state)) 258 goto err; 259 } 260 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_TYPE, qp->qp_type)) 261 goto err; 262 if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_STATE, qp_attr.qp_state)) 263 goto err; 264 265 /* 266 * Existence of task means that it is user QP and netlink 267 * user is invited to go and read /proc/PID/comm to get name 268 * of the task file and res->task_com should be NULL. 269 */ 270 if (rdma_is_kernel_res(res)) { 271 if (nla_put_string(msg, RDMA_NLDEV_ATTR_RES_KERN_NAME, res->kern_name)) 272 goto err; 273 } else { 274 if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_PID, task_pid_vnr(res->task))) 275 goto err; 276 } 277 278 nla_nest_end(msg, entry_attr); 279 return 0; 280 281 err: 282 nla_nest_cancel(msg, entry_attr); 283 out: 284 return -EMSGSIZE; 285 } 286 287 static int nldev_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh, 288 struct netlink_ext_ack *extack) 289 { 290 struct nlattr *tb[RDMA_NLDEV_ATTR_MAX]; 291 struct ib_device *device; 292 struct sk_buff *msg; 293 u32 index; 294 int err; 295 296 err = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, 297 nldev_policy, extack); 298 if (err || !tb[RDMA_NLDEV_ATTR_DEV_INDEX]) 299 return -EINVAL; 300 301 index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); 302 303 device = ib_device_get_by_index(index); 304 if (!device) 305 return -EINVAL; 306 307 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 308 if (!msg) { 309 err = -ENOMEM; 310 goto err; 311 } 312 313 nlh = nlmsg_put(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 314 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_GET), 315 0, 0); 316 317 err = fill_dev_info(msg, device); 318 if (err) 319 goto err_free; 320 321 nlmsg_end(msg, nlh); 322 323 put_device(&device->dev); 324 return rdma_nl_unicast(msg, NETLINK_CB(skb).portid); 325 326 err_free: 327 nlmsg_free(msg); 328 err: 329 put_device(&device->dev); 330 return err; 331 } 332 333 static int _nldev_get_dumpit(struct ib_device *device, 334 struct sk_buff *skb, 335 struct netlink_callback *cb, 336 unsigned int idx) 337 { 338 int start = cb->args[0]; 339 struct nlmsghdr *nlh; 340 341 if (idx < start) 342 return 0; 343 344 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 345 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_GET), 346 0, NLM_F_MULTI); 347 348 if (fill_dev_info(skb, device)) { 349 nlmsg_cancel(skb, nlh); 350 goto out; 351 } 352 353 nlmsg_end(skb, nlh); 354 355 idx++; 356 357 out: cb->args[0] = idx; 358 return skb->len; 359 } 360 361 static int nldev_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) 362 { 363 /* 364 * There is no need to take lock, because 365 * we are relying on ib_core's lists_rwsem 366 */ 367 return ib_enum_all_devs(_nldev_get_dumpit, skb, cb); 368 } 369 370 static int nldev_port_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh, 371 struct netlink_ext_ack *extack) 372 { 373 struct nlattr *tb[RDMA_NLDEV_ATTR_MAX]; 374 struct ib_device *device; 375 struct sk_buff *msg; 376 u32 index; 377 u32 port; 378 int err; 379 380 err = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, 381 nldev_policy, extack); 382 if (err || 383 !tb[RDMA_NLDEV_ATTR_DEV_INDEX] || 384 !tb[RDMA_NLDEV_ATTR_PORT_INDEX]) 385 return -EINVAL; 386 387 index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); 388 device = ib_device_get_by_index(index); 389 if (!device) 390 return -EINVAL; 391 392 port = nla_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]); 393 if (!rdma_is_port_valid(device, port)) { 394 err = -EINVAL; 395 goto err; 396 } 397 398 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 399 if (!msg) { 400 err = -ENOMEM; 401 goto err; 402 } 403 404 nlh = nlmsg_put(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 405 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_GET), 406 0, 0); 407 408 err = fill_port_info(msg, device, port); 409 if (err) 410 goto err_free; 411 412 nlmsg_end(msg, nlh); 413 put_device(&device->dev); 414 415 return rdma_nl_unicast(msg, NETLINK_CB(skb).portid); 416 417 err_free: 418 nlmsg_free(msg); 419 err: 420 put_device(&device->dev); 421 return err; 422 } 423 424 static int nldev_port_get_dumpit(struct sk_buff *skb, 425 struct netlink_callback *cb) 426 { 427 struct nlattr *tb[RDMA_NLDEV_ATTR_MAX]; 428 struct ib_device *device; 429 int start = cb->args[0]; 430 struct nlmsghdr *nlh; 431 u32 idx = 0; 432 u32 ifindex; 433 int err; 434 u32 p; 435 436 err = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, 437 nldev_policy, NULL); 438 if (err || !tb[RDMA_NLDEV_ATTR_DEV_INDEX]) 439 return -EINVAL; 440 441 ifindex = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); 442 device = ib_device_get_by_index(ifindex); 443 if (!device) 444 return -EINVAL; 445 446 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) { 447 /* 448 * The dumpit function returns all information from specific 449 * index. This specific index is taken from the netlink 450 * messages request sent by user and it is available 451 * in cb->args[0]. 452 * 453 * Usually, the user doesn't fill this field and it causes 454 * to return everything. 455 * 456 */ 457 if (idx < start) { 458 idx++; 459 continue; 460 } 461 462 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, 463 cb->nlh->nlmsg_seq, 464 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, 465 RDMA_NLDEV_CMD_PORT_GET), 466 0, NLM_F_MULTI); 467 468 if (fill_port_info(skb, device, p)) { 469 nlmsg_cancel(skb, nlh); 470 goto out; 471 } 472 idx++; 473 nlmsg_end(skb, nlh); 474 } 475 476 out: 477 put_device(&device->dev); 478 cb->args[0] = idx; 479 return skb->len; 480 } 481 482 static int nldev_res_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh, 483 struct netlink_ext_ack *extack) 484 { 485 struct nlattr *tb[RDMA_NLDEV_ATTR_MAX]; 486 struct ib_device *device; 487 struct sk_buff *msg; 488 u32 index; 489 int ret; 490 491 ret = nlmsg_parse(nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, 492 nldev_policy, extack); 493 if (ret || !tb[RDMA_NLDEV_ATTR_DEV_INDEX]) 494 return -EINVAL; 495 496 index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); 497 device = ib_device_get_by_index(index); 498 if (!device) 499 return -EINVAL; 500 501 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); 502 if (!msg) { 503 ret = -ENOMEM; 504 goto err; 505 } 506 507 nlh = nlmsg_put(msg, NETLINK_CB(skb).portid, nlh->nlmsg_seq, 508 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_RES_GET), 509 0, 0); 510 511 ret = fill_res_info(msg, device); 512 if (ret) 513 goto err_free; 514 515 nlmsg_end(msg, nlh); 516 put_device(&device->dev); 517 return rdma_nl_unicast(msg, NETLINK_CB(skb).portid); 518 519 err_free: 520 nlmsg_free(msg); 521 err: 522 put_device(&device->dev); 523 return ret; 524 } 525 526 static int _nldev_res_get_dumpit(struct ib_device *device, 527 struct sk_buff *skb, 528 struct netlink_callback *cb, 529 unsigned int idx) 530 { 531 int start = cb->args[0]; 532 struct nlmsghdr *nlh; 533 534 if (idx < start) 535 return 0; 536 537 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 538 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_RES_GET), 539 0, NLM_F_MULTI); 540 541 if (fill_res_info(skb, device)) { 542 nlmsg_cancel(skb, nlh); 543 goto out; 544 } 545 546 nlmsg_end(skb, nlh); 547 548 idx++; 549 550 out: 551 cb->args[0] = idx; 552 return skb->len; 553 } 554 555 static int nldev_res_get_dumpit(struct sk_buff *skb, 556 struct netlink_callback *cb) 557 { 558 return ib_enum_all_devs(_nldev_res_get_dumpit, skb, cb); 559 } 560 561 static int nldev_res_get_qp_dumpit(struct sk_buff *skb, 562 struct netlink_callback *cb) 563 { 564 struct nlattr *tb[RDMA_NLDEV_ATTR_MAX]; 565 struct rdma_restrack_entry *res; 566 int err, ret = 0, idx = 0; 567 struct nlattr *table_attr; 568 struct ib_device *device; 569 int start = cb->args[0]; 570 struct ib_qp *qp = NULL; 571 struct nlmsghdr *nlh; 572 u32 index, port = 0; 573 574 err = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1, 575 nldev_policy, NULL); 576 /* 577 * Right now, we are expecting the device index to get QP information, 578 * but it is possible to extend this code to return all devices in 579 * one shot by checking the existence of RDMA_NLDEV_ATTR_DEV_INDEX. 580 * if it doesn't exist, we will iterate over all devices. 581 * 582 * But it is not needed for now. 583 */ 584 if (err || !tb[RDMA_NLDEV_ATTR_DEV_INDEX]) 585 return -EINVAL; 586 587 index = nla_get_u32(tb[RDMA_NLDEV_ATTR_DEV_INDEX]); 588 device = ib_device_get_by_index(index); 589 if (!device) 590 return -EINVAL; 591 592 /* 593 * If no PORT_INDEX is supplied, we will return all QPs from that device 594 */ 595 if (tb[RDMA_NLDEV_ATTR_PORT_INDEX]) { 596 port = nla_get_u32(tb[RDMA_NLDEV_ATTR_PORT_INDEX]); 597 if (!rdma_is_port_valid(device, port)) { 598 ret = -EINVAL; 599 goto err_index; 600 } 601 } 602 603 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 604 RDMA_NL_GET_TYPE(RDMA_NL_NLDEV, RDMA_NLDEV_CMD_RES_QP_GET), 605 0, NLM_F_MULTI); 606 607 if (fill_nldev_handle(skb, device)) { 608 ret = -EMSGSIZE; 609 goto err; 610 } 611 612 table_attr = nla_nest_start(skb, RDMA_NLDEV_ATTR_RES_QP); 613 if (!table_attr) { 614 ret = -EMSGSIZE; 615 goto err; 616 } 617 618 down_read(&device->res.rwsem); 619 hash_for_each_possible(device->res.hash, res, node, RDMA_RESTRACK_QP) { 620 if (idx < start) 621 goto next; 622 623 if ((rdma_is_kernel_res(res) && 624 task_active_pid_ns(current) != &init_pid_ns) || 625 (!rdma_is_kernel_res(res) && 626 task_active_pid_ns(current) != task_active_pid_ns(res->task))) 627 /* 628 * 1. Kernel QPs should be visible in init namspace only 629 * 2. Present only QPs visible in the current namespace 630 */ 631 goto next; 632 633 if (!rdma_restrack_get(res)) 634 /* 635 * Resource is under release now, but we are not 636 * relesing lock now, so it will be released in 637 * our next pass, once we will get ->next pointer. 638 */ 639 goto next; 640 641 qp = container_of(res, struct ib_qp, res); 642 643 up_read(&device->res.rwsem); 644 ret = fill_res_qp_entry(skb, qp, port); 645 down_read(&device->res.rwsem); 646 /* 647 * Return resource back, but it won't be released till 648 * the &device->res.rwsem will be released for write. 649 */ 650 rdma_restrack_put(res); 651 652 if (ret == -EMSGSIZE) 653 /* 654 * There is a chance to optimize here. 655 * It can be done by using list_prepare_entry 656 * and list_for_each_entry_continue afterwards. 657 */ 658 break; 659 if (ret) 660 goto res_err; 661 next: idx++; 662 } 663 up_read(&device->res.rwsem); 664 665 nla_nest_end(skb, table_attr); 666 nlmsg_end(skb, nlh); 667 cb->args[0] = idx; 668 669 /* 670 * No more QPs to fill, cancel the message and 671 * return 0 to mark end of dumpit. 672 */ 673 if (!qp) 674 goto err; 675 676 put_device(&device->dev); 677 return skb->len; 678 679 res_err: 680 nla_nest_cancel(skb, table_attr); 681 up_read(&device->res.rwsem); 682 683 err: 684 nlmsg_cancel(skb, nlh); 685 686 err_index: 687 put_device(&device->dev); 688 return ret; 689 } 690 691 static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = { 692 [RDMA_NLDEV_CMD_GET] = { 693 .doit = nldev_get_doit, 694 .dump = nldev_get_dumpit, 695 }, 696 [RDMA_NLDEV_CMD_PORT_GET] = { 697 .doit = nldev_port_get_doit, 698 .dump = nldev_port_get_dumpit, 699 }, 700 [RDMA_NLDEV_CMD_RES_GET] = { 701 .doit = nldev_res_get_doit, 702 .dump = nldev_res_get_dumpit, 703 }, 704 [RDMA_NLDEV_CMD_RES_QP_GET] = { 705 .dump = nldev_res_get_qp_dumpit, 706 /* 707 * .doit is not implemented yet for two reasons: 708 * 1. It is not needed yet. 709 * 2. There is a need to provide identifier, while it is easy 710 * for the QPs (device index + port index + LQPN), it is not 711 * the case for the rest of resources (PD and CQ). Because it 712 * is better to provide similar interface for all resources, 713 * let's wait till we will have other resources implemented 714 * too. 715 */ 716 }, 717 }; 718 719 void __init nldev_init(void) 720 { 721 rdma_nl_register(RDMA_NL_NLDEV, nldev_cb_table); 722 } 723 724 void __exit nldev_exit(void) 725 { 726 rdma_nl_unregister(RDMA_NL_NLDEV); 727 } 728 729 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_NLDEV, 5); 730