1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause 2 3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */ 4 /* Copyright (c) 2008-2019, IBM Corporation */ 5 6 #include <linux/init.h> 7 #include <linux/errno.h> 8 #include <linux/netdevice.h> 9 #include <linux/inetdevice.h> 10 #include <net/net_namespace.h> 11 #include <linux/rtnetlink.h> 12 #include <linux/if_arp.h> 13 #include <linux/list.h> 14 #include <linux/kernel.h> 15 #include <linux/sched.h> 16 #include <linux/module.h> 17 #include <linux/dma-mapping.h> 18 19 #include <net/addrconf.h> 20 #include <rdma/ib_verbs.h> 21 #include <rdma/ib_user_verbs.h> 22 #include <rdma/rdma_netlink.h> 23 #include <linux/kthread.h> 24 25 #include "siw.h" 26 #include "siw_verbs.h" 27 28 MODULE_AUTHOR("Bernard Metzler"); 29 MODULE_DESCRIPTION("Software iWARP Driver"); 30 MODULE_LICENSE("Dual BSD/GPL"); 31 32 /* transmit from user buffer, if possible */ 33 const bool zcopy_tx = true; 34 35 /* Restrict usage of GSO, if hardware peer iwarp is unable to process 36 * large packets. try_gso = true lets siw try to use local GSO, 37 * if peer agrees. Not using GSO severly limits siw maximum tx bandwidth. 38 */ 39 const bool try_gso; 40 41 /* Attach siw also with loopback devices */ 42 const bool loopback_enabled = true; 43 44 /* We try to negotiate CRC on, if true */ 45 const bool mpa_crc_required; 46 47 /* MPA CRC on/off enforced */ 48 const bool mpa_crc_strict; 49 50 /* Control TCP_NODELAY socket option */ 51 const bool siw_tcp_nagle; 52 53 /* Select MPA version to be used during connection setup */ 54 u_char mpa_version = MPA_REVISION_2; 55 56 /* Selects MPA P2P mode (additional handshake during connection 57 * setup, if true. 58 */ 59 const bool peer_to_peer; 60 61 struct task_struct *siw_tx_thread[NR_CPUS]; 62 struct crypto_shash *siw_crypto_shash; 63 64 static int siw_device_register(struct siw_device *sdev, const char *name) 65 { 66 struct ib_device *base_dev = &sdev->base_dev; 67 static int dev_id = 1; 68 int rv; 69 70 sdev->vendor_part_id = dev_id++; 71 72 rv = ib_register_device(base_dev, name, NULL); 73 if (rv) { 74 pr_warn("siw: device registration error %d\n", rv); 75 return rv; 76 } 77 78 siw_dbg(base_dev, "HWaddr=%pM\n", sdev->netdev->dev_addr); 79 80 return 0; 81 } 82 83 static void siw_device_cleanup(struct ib_device *base_dev) 84 { 85 struct siw_device *sdev = to_siw_dev(base_dev); 86 87 xa_destroy(&sdev->qp_xa); 88 xa_destroy(&sdev->mem_xa); 89 } 90 91 static int siw_create_tx_threads(void) 92 { 93 int cpu, assigned = 0; 94 95 for_each_online_cpu(cpu) { 96 /* Skip HT cores */ 97 if (cpu % cpumask_weight(topology_sibling_cpumask(cpu))) 98 continue; 99 100 siw_tx_thread[cpu] = 101 kthread_run_on_cpu(siw_run_sq, 102 (unsigned long *)(long)cpu, 103 cpu, "siw_tx/%u"); 104 if (IS_ERR(siw_tx_thread[cpu])) { 105 siw_tx_thread[cpu] = NULL; 106 continue; 107 } 108 109 assigned++; 110 } 111 return assigned; 112 } 113 114 static int siw_dev_qualified(struct net_device *netdev) 115 { 116 /* 117 * Additional hardware support can be added here 118 * (e.g. ARPHRD_FDDI, ARPHRD_ATM, ...) - see 119 * <linux/if_arp.h> for type identifiers. 120 */ 121 if (netdev->type == ARPHRD_ETHER || netdev->type == ARPHRD_IEEE802 || 122 netdev->type == ARPHRD_NONE || 123 (netdev->type == ARPHRD_LOOPBACK && loopback_enabled)) 124 return 1; 125 126 return 0; 127 } 128 129 static DEFINE_PER_CPU(atomic_t, siw_use_cnt); 130 131 static struct { 132 struct cpumask **tx_valid_cpus; 133 int num_nodes; 134 } siw_cpu_info; 135 136 static int siw_init_cpulist(void) 137 { 138 int i, num_nodes = nr_node_ids; 139 140 memset(siw_tx_thread, 0, sizeof(siw_tx_thread)); 141 142 siw_cpu_info.num_nodes = num_nodes; 143 144 siw_cpu_info.tx_valid_cpus = 145 kcalloc(num_nodes, sizeof(struct cpumask *), GFP_KERNEL); 146 if (!siw_cpu_info.tx_valid_cpus) { 147 siw_cpu_info.num_nodes = 0; 148 return -ENOMEM; 149 } 150 for (i = 0; i < siw_cpu_info.num_nodes; i++) { 151 siw_cpu_info.tx_valid_cpus[i] = 152 kzalloc(sizeof(struct cpumask), GFP_KERNEL); 153 if (!siw_cpu_info.tx_valid_cpus[i]) 154 goto out_err; 155 156 cpumask_clear(siw_cpu_info.tx_valid_cpus[i]); 157 } 158 for_each_possible_cpu(i) 159 cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]); 160 161 return 0; 162 163 out_err: 164 siw_cpu_info.num_nodes = 0; 165 while (--i >= 0) 166 kfree(siw_cpu_info.tx_valid_cpus[i]); 167 kfree(siw_cpu_info.tx_valid_cpus); 168 siw_cpu_info.tx_valid_cpus = NULL; 169 170 return -ENOMEM; 171 } 172 173 static void siw_destroy_cpulist(void) 174 { 175 int i = 0; 176 177 while (i < siw_cpu_info.num_nodes) 178 kfree(siw_cpu_info.tx_valid_cpus[i++]); 179 180 kfree(siw_cpu_info.tx_valid_cpus); 181 } 182 183 /* 184 * Choose CPU with least number of active QP's from NUMA node of 185 * TX interface. 186 */ 187 int siw_get_tx_cpu(struct siw_device *sdev) 188 { 189 const struct cpumask *tx_cpumask; 190 int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1; 191 192 if (node < 0) 193 tx_cpumask = cpu_online_mask; 194 else 195 tx_cpumask = siw_cpu_info.tx_valid_cpus[node]; 196 197 num_cpus = cpumask_weight(tx_cpumask); 198 if (!num_cpus) { 199 /* no CPU on this NUMA node */ 200 tx_cpumask = cpu_online_mask; 201 num_cpus = cpumask_weight(tx_cpumask); 202 } 203 if (!num_cpus) 204 goto out; 205 206 cpu = cpumask_first(tx_cpumask); 207 208 for (i = 0, min_use = SIW_MAX_QP; i < num_cpus; 209 i++, cpu = cpumask_next(cpu, tx_cpumask)) { 210 int usage; 211 212 /* Skip any cores which have no TX thread */ 213 if (!siw_tx_thread[cpu]) 214 continue; 215 216 usage = atomic_read(&per_cpu(siw_use_cnt, cpu)); 217 if (usage <= min_use) { 218 tx_cpu = cpu; 219 min_use = usage; 220 } 221 } 222 siw_dbg(&sdev->base_dev, 223 "tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use); 224 225 out: 226 if (tx_cpu >= 0) 227 atomic_inc(&per_cpu(siw_use_cnt, tx_cpu)); 228 else 229 pr_warn("siw: no tx cpu found\n"); 230 231 return tx_cpu; 232 } 233 234 void siw_put_tx_cpu(int cpu) 235 { 236 atomic_dec(&per_cpu(siw_use_cnt, cpu)); 237 } 238 239 static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id) 240 { 241 struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id); 242 243 if (qp) { 244 /* 245 * siw_qp_id2obj() increments object reference count 246 */ 247 siw_qp_put(qp); 248 return &qp->base_qp; 249 } 250 return NULL; 251 } 252 253 static const struct ib_device_ops siw_device_ops = { 254 .owner = THIS_MODULE, 255 .uverbs_abi_ver = SIW_ABI_VERSION, 256 .driver_id = RDMA_DRIVER_SIW, 257 258 .alloc_mr = siw_alloc_mr, 259 .alloc_pd = siw_alloc_pd, 260 .alloc_ucontext = siw_alloc_ucontext, 261 .create_cq = siw_create_cq, 262 .create_qp = siw_create_qp, 263 .create_srq = siw_create_srq, 264 .dealloc_driver = siw_device_cleanup, 265 .dealloc_pd = siw_dealloc_pd, 266 .dealloc_ucontext = siw_dealloc_ucontext, 267 .dereg_mr = siw_dereg_mr, 268 .destroy_cq = siw_destroy_cq, 269 .destroy_qp = siw_destroy_qp, 270 .destroy_srq = siw_destroy_srq, 271 .get_dma_mr = siw_get_dma_mr, 272 .get_port_immutable = siw_get_port_immutable, 273 .iw_accept = siw_accept, 274 .iw_add_ref = siw_qp_get_ref, 275 .iw_connect = siw_connect, 276 .iw_create_listen = siw_create_listen, 277 .iw_destroy_listen = siw_destroy_listen, 278 .iw_get_qp = siw_get_base_qp, 279 .iw_reject = siw_reject, 280 .iw_rem_ref = siw_qp_put_ref, 281 .map_mr_sg = siw_map_mr_sg, 282 .mmap = siw_mmap, 283 .mmap_free = siw_mmap_free, 284 .modify_qp = siw_verbs_modify_qp, 285 .modify_srq = siw_modify_srq, 286 .poll_cq = siw_poll_cq, 287 .post_recv = siw_post_receive, 288 .post_send = siw_post_send, 289 .post_srq_recv = siw_post_srq_recv, 290 .query_device = siw_query_device, 291 .query_gid = siw_query_gid, 292 .query_port = siw_query_port, 293 .query_qp = siw_query_qp, 294 .query_srq = siw_query_srq, 295 .req_notify_cq = siw_req_notify_cq, 296 .reg_user_mr = siw_reg_user_mr, 297 298 INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq), 299 INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd), 300 INIT_RDMA_OBJ_SIZE(ib_qp, siw_qp, base_qp), 301 INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq), 302 INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext), 303 }; 304 305 static struct siw_device *siw_device_create(struct net_device *netdev) 306 { 307 struct siw_device *sdev = NULL; 308 struct ib_device *base_dev; 309 int rv; 310 311 sdev = ib_alloc_device(siw_device, base_dev); 312 if (!sdev) 313 return NULL; 314 315 base_dev = &sdev->base_dev; 316 317 sdev->netdev = netdev; 318 319 if (netdev->type != ARPHRD_LOOPBACK && netdev->type != ARPHRD_NONE) { 320 addrconf_addr_eui48((unsigned char *)&base_dev->node_guid, 321 netdev->dev_addr); 322 } else { 323 /* 324 * This device does not have a HW address, 325 * but connection mangagement lib expects gid != 0 326 */ 327 size_t len = min_t(size_t, strlen(base_dev->name), 6); 328 char addr[6] = { }; 329 330 memcpy(addr, base_dev->name, len); 331 addrconf_addr_eui48((unsigned char *)&base_dev->node_guid, 332 addr); 333 } 334 335 base_dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_POST_SEND); 336 337 base_dev->node_type = RDMA_NODE_RNIC; 338 memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON, 339 sizeof(SIW_NODE_DESC_COMMON)); 340 341 /* 342 * Current model (one-to-one device association): 343 * One Softiwarp device per net_device or, equivalently, 344 * per physical port. 345 */ 346 base_dev->phys_port_cnt = 1; 347 base_dev->num_comp_vectors = num_possible_cpus(); 348 349 xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1); 350 xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1); 351 352 ib_set_device_ops(base_dev, &siw_device_ops); 353 rv = ib_device_set_netdev(base_dev, netdev, 1); 354 if (rv) 355 goto error; 356 357 memcpy(base_dev->iw_ifname, netdev->name, 358 sizeof(base_dev->iw_ifname)); 359 360 /* Disable TCP port mapping */ 361 base_dev->iw_driver_flags = IW_F_NO_PORT_MAP; 362 363 sdev->attrs.max_qp = SIW_MAX_QP; 364 sdev->attrs.max_qp_wr = SIW_MAX_QP_WR; 365 sdev->attrs.max_ord = SIW_MAX_ORD_QP; 366 sdev->attrs.max_ird = SIW_MAX_IRD_QP; 367 sdev->attrs.max_sge = SIW_MAX_SGE; 368 sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD; 369 sdev->attrs.max_cq = SIW_MAX_CQ; 370 sdev->attrs.max_cqe = SIW_MAX_CQE; 371 sdev->attrs.max_mr = SIW_MAX_MR; 372 sdev->attrs.max_pd = SIW_MAX_PD; 373 sdev->attrs.max_mw = SIW_MAX_MW; 374 sdev->attrs.max_srq = SIW_MAX_SRQ; 375 sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR; 376 sdev->attrs.max_srq_sge = SIW_MAX_SGE; 377 378 INIT_LIST_HEAD(&sdev->cep_list); 379 INIT_LIST_HEAD(&sdev->qp_list); 380 381 atomic_set(&sdev->num_ctx, 0); 382 atomic_set(&sdev->num_srq, 0); 383 atomic_set(&sdev->num_qp, 0); 384 atomic_set(&sdev->num_cq, 0); 385 atomic_set(&sdev->num_mr, 0); 386 atomic_set(&sdev->num_pd, 0); 387 388 sdev->numa_node = dev_to_node(&netdev->dev); 389 spin_lock_init(&sdev->lock); 390 391 return sdev; 392 error: 393 ib_dealloc_device(base_dev); 394 395 return NULL; 396 } 397 398 /* 399 * Network link becomes unavailable. Mark all 400 * affected QP's accordingly. 401 */ 402 static void siw_netdev_down(struct work_struct *work) 403 { 404 struct siw_device *sdev = 405 container_of(work, struct siw_device, netdev_down); 406 407 struct siw_qp_attrs qp_attrs; 408 struct list_head *pos, *tmp; 409 410 memset(&qp_attrs, 0, sizeof(qp_attrs)); 411 qp_attrs.state = SIW_QP_STATE_ERROR; 412 413 list_for_each_safe(pos, tmp, &sdev->qp_list) { 414 struct siw_qp *qp = list_entry(pos, struct siw_qp, devq); 415 416 down_write(&qp->state_lock); 417 WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE)); 418 up_write(&qp->state_lock); 419 } 420 ib_device_put(&sdev->base_dev); 421 } 422 423 static void siw_device_goes_down(struct siw_device *sdev) 424 { 425 if (ib_device_try_get(&sdev->base_dev)) { 426 INIT_WORK(&sdev->netdev_down, siw_netdev_down); 427 schedule_work(&sdev->netdev_down); 428 } 429 } 430 431 static int siw_netdev_event(struct notifier_block *nb, unsigned long event, 432 void *arg) 433 { 434 struct net_device *netdev = netdev_notifier_info_to_dev(arg); 435 struct ib_device *base_dev; 436 struct siw_device *sdev; 437 438 dev_dbg(&netdev->dev, "siw: event %lu\n", event); 439 440 if (dev_net(netdev) != &init_net) 441 return NOTIFY_OK; 442 443 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 444 if (!base_dev) 445 return NOTIFY_OK; 446 447 sdev = to_siw_dev(base_dev); 448 449 switch (event) { 450 case NETDEV_UP: 451 sdev->state = IB_PORT_ACTIVE; 452 siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE); 453 break; 454 455 case NETDEV_GOING_DOWN: 456 siw_device_goes_down(sdev); 457 break; 458 459 case NETDEV_DOWN: 460 sdev->state = IB_PORT_DOWN; 461 siw_port_event(sdev, 1, IB_EVENT_PORT_ERR); 462 break; 463 464 case NETDEV_REGISTER: 465 /* 466 * Device registration now handled only by 467 * rdma netlink commands. So it shall be impossible 468 * to end up here with a valid siw device. 469 */ 470 siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n"); 471 break; 472 473 case NETDEV_UNREGISTER: 474 ib_unregister_device_queued(&sdev->base_dev); 475 break; 476 477 case NETDEV_CHANGEADDR: 478 siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE); 479 break; 480 /* 481 * Todo: Below netdev events are currently not handled. 482 */ 483 case NETDEV_CHANGEMTU: 484 case NETDEV_CHANGE: 485 break; 486 487 default: 488 break; 489 } 490 ib_device_put(&sdev->base_dev); 491 492 return NOTIFY_OK; 493 } 494 495 static struct notifier_block siw_netdev_nb = { 496 .notifier_call = siw_netdev_event, 497 }; 498 499 static int siw_newlink(const char *basedev_name, struct net_device *netdev) 500 { 501 struct ib_device *base_dev; 502 struct siw_device *sdev = NULL; 503 int rv = -ENOMEM; 504 505 if (!siw_dev_qualified(netdev)) 506 return -EINVAL; 507 508 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 509 if (base_dev) { 510 ib_device_put(base_dev); 511 return -EEXIST; 512 } 513 sdev = siw_device_create(netdev); 514 if (sdev) { 515 dev_dbg(&netdev->dev, "siw: new device\n"); 516 517 if (netif_running(netdev) && netif_carrier_ok(netdev)) 518 sdev->state = IB_PORT_ACTIVE; 519 else 520 sdev->state = IB_PORT_DOWN; 521 522 rv = siw_device_register(sdev, basedev_name); 523 if (rv) 524 ib_dealloc_device(&sdev->base_dev); 525 } 526 return rv; 527 } 528 529 static struct rdma_link_ops siw_link_ops = { 530 .type = "siw", 531 .newlink = siw_newlink, 532 }; 533 534 /* 535 * siw_init_module - Initialize Softiwarp module and register with netdev 536 * subsystem. 537 */ 538 static __init int siw_init_module(void) 539 { 540 int rv; 541 int nr_cpu; 542 543 if (SENDPAGE_THRESH < SIW_MAX_INLINE) { 544 pr_info("siw: sendpage threshold too small: %u\n", 545 (int)SENDPAGE_THRESH); 546 rv = -EINVAL; 547 goto out_error; 548 } 549 rv = siw_init_cpulist(); 550 if (rv) 551 goto out_error; 552 553 rv = siw_cm_init(); 554 if (rv) 555 goto out_error; 556 557 if (!siw_create_tx_threads()) { 558 pr_info("siw: Could not start any TX thread\n"); 559 rv = -ENOMEM; 560 goto out_error; 561 } 562 /* 563 * Locate CRC32 algorithm. If unsuccessful, fail 564 * loading siw only, if CRC is required. 565 */ 566 siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0); 567 if (IS_ERR(siw_crypto_shash)) { 568 pr_info("siw: Loading CRC32c failed: %ld\n", 569 PTR_ERR(siw_crypto_shash)); 570 siw_crypto_shash = NULL; 571 if (mpa_crc_required) { 572 rv = -EOPNOTSUPP; 573 goto out_error; 574 } 575 } 576 rv = register_netdevice_notifier(&siw_netdev_nb); 577 if (rv) 578 goto out_error; 579 580 rdma_link_register(&siw_link_ops); 581 582 pr_info("SoftiWARP attached\n"); 583 return 0; 584 585 out_error: 586 for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) { 587 if (siw_tx_thread[nr_cpu]) { 588 siw_stop_tx_thread(nr_cpu); 589 siw_tx_thread[nr_cpu] = NULL; 590 } 591 } 592 if (siw_crypto_shash) 593 crypto_free_shash(siw_crypto_shash); 594 595 pr_info("SoftIWARP attach failed. Error: %d\n", rv); 596 597 siw_cm_exit(); 598 siw_destroy_cpulist(); 599 600 return rv; 601 } 602 603 static void __exit siw_exit_module(void) 604 { 605 int cpu; 606 607 for_each_possible_cpu(cpu) { 608 if (siw_tx_thread[cpu]) { 609 siw_stop_tx_thread(cpu); 610 siw_tx_thread[cpu] = NULL; 611 } 612 } 613 unregister_netdevice_notifier(&siw_netdev_nb); 614 rdma_link_unregister(&siw_link_ops); 615 ib_unregister_driver(RDMA_DRIVER_SIW); 616 617 siw_cm_exit(); 618 619 siw_destroy_cpulist(); 620 621 if (siw_crypto_shash) 622 crypto_free_shash(siw_crypto_shash); 623 624 pr_info("SoftiWARP detached\n"); 625 } 626 627 module_init(siw_init_module); 628 module_exit(siw_exit_module); 629 630 MODULE_ALIAS_RDMA_LINK("siw"); 631