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_LOOPBACK && loopback_enabled)) 123 return 1; 124 125 return 0; 126 } 127 128 static DEFINE_PER_CPU(atomic_t, siw_use_cnt); 129 130 static struct { 131 struct cpumask **tx_valid_cpus; 132 int num_nodes; 133 } siw_cpu_info; 134 135 static int siw_init_cpulist(void) 136 { 137 int i, num_nodes = nr_node_ids; 138 139 memset(siw_tx_thread, 0, sizeof(siw_tx_thread)); 140 141 siw_cpu_info.num_nodes = num_nodes; 142 143 siw_cpu_info.tx_valid_cpus = 144 kcalloc(num_nodes, sizeof(struct cpumask *), GFP_KERNEL); 145 if (!siw_cpu_info.tx_valid_cpus) { 146 siw_cpu_info.num_nodes = 0; 147 return -ENOMEM; 148 } 149 for (i = 0; i < siw_cpu_info.num_nodes; i++) { 150 siw_cpu_info.tx_valid_cpus[i] = 151 kzalloc(sizeof(struct cpumask), GFP_KERNEL); 152 if (!siw_cpu_info.tx_valid_cpus[i]) 153 goto out_err; 154 155 cpumask_clear(siw_cpu_info.tx_valid_cpus[i]); 156 } 157 for_each_possible_cpu(i) 158 cpumask_set_cpu(i, siw_cpu_info.tx_valid_cpus[cpu_to_node(i)]); 159 160 return 0; 161 162 out_err: 163 siw_cpu_info.num_nodes = 0; 164 while (--i >= 0) 165 kfree(siw_cpu_info.tx_valid_cpus[i]); 166 kfree(siw_cpu_info.tx_valid_cpus); 167 siw_cpu_info.tx_valid_cpus = NULL; 168 169 return -ENOMEM; 170 } 171 172 static void siw_destroy_cpulist(void) 173 { 174 int i = 0; 175 176 while (i < siw_cpu_info.num_nodes) 177 kfree(siw_cpu_info.tx_valid_cpus[i++]); 178 179 kfree(siw_cpu_info.tx_valid_cpus); 180 } 181 182 /* 183 * Choose CPU with least number of active QP's from NUMA node of 184 * TX interface. 185 */ 186 int siw_get_tx_cpu(struct siw_device *sdev) 187 { 188 const struct cpumask *tx_cpumask; 189 int i, num_cpus, cpu, min_use, node = sdev->numa_node, tx_cpu = -1; 190 191 if (node < 0) 192 tx_cpumask = cpu_online_mask; 193 else 194 tx_cpumask = siw_cpu_info.tx_valid_cpus[node]; 195 196 num_cpus = cpumask_weight(tx_cpumask); 197 if (!num_cpus) { 198 /* no CPU on this NUMA node */ 199 tx_cpumask = cpu_online_mask; 200 num_cpus = cpumask_weight(tx_cpumask); 201 } 202 if (!num_cpus) 203 goto out; 204 205 cpu = cpumask_first(tx_cpumask); 206 207 for (i = 0, min_use = SIW_MAX_QP; i < num_cpus; 208 i++, cpu = cpumask_next(cpu, tx_cpumask)) { 209 int usage; 210 211 /* Skip any cores which have no TX thread */ 212 if (!siw_tx_thread[cpu]) 213 continue; 214 215 usage = atomic_read(&per_cpu(siw_use_cnt, cpu)); 216 if (usage <= min_use) { 217 tx_cpu = cpu; 218 min_use = usage; 219 } 220 } 221 siw_dbg(&sdev->base_dev, 222 "tx cpu %d, node %d, %d qp's\n", tx_cpu, node, min_use); 223 224 out: 225 if (tx_cpu >= 0) 226 atomic_inc(&per_cpu(siw_use_cnt, tx_cpu)); 227 else 228 pr_warn("siw: no tx cpu found\n"); 229 230 return tx_cpu; 231 } 232 233 void siw_put_tx_cpu(int cpu) 234 { 235 atomic_dec(&per_cpu(siw_use_cnt, cpu)); 236 } 237 238 static struct ib_qp *siw_get_base_qp(struct ib_device *base_dev, int id) 239 { 240 struct siw_qp *qp = siw_qp_id2obj(to_siw_dev(base_dev), id); 241 242 if (qp) { 243 /* 244 * siw_qp_id2obj() increments object reference count 245 */ 246 siw_qp_put(qp); 247 return &qp->base_qp; 248 } 249 return NULL; 250 } 251 252 static const struct ib_device_ops siw_device_ops = { 253 .owner = THIS_MODULE, 254 .uverbs_abi_ver = SIW_ABI_VERSION, 255 .driver_id = RDMA_DRIVER_SIW, 256 257 .alloc_mr = siw_alloc_mr, 258 .alloc_pd = siw_alloc_pd, 259 .alloc_ucontext = siw_alloc_ucontext, 260 .create_cq = siw_create_cq, 261 .create_qp = siw_create_qp, 262 .create_srq = siw_create_srq, 263 .dealloc_driver = siw_device_cleanup, 264 .dealloc_pd = siw_dealloc_pd, 265 .dealloc_ucontext = siw_dealloc_ucontext, 266 .dereg_mr = siw_dereg_mr, 267 .destroy_cq = siw_destroy_cq, 268 .destroy_qp = siw_destroy_qp, 269 .destroy_srq = siw_destroy_srq, 270 .get_dma_mr = siw_get_dma_mr, 271 .get_port_immutable = siw_get_port_immutable, 272 .iw_accept = siw_accept, 273 .iw_add_ref = siw_qp_get_ref, 274 .iw_connect = siw_connect, 275 .iw_create_listen = siw_create_listen, 276 .iw_destroy_listen = siw_destroy_listen, 277 .iw_get_qp = siw_get_base_qp, 278 .iw_reject = siw_reject, 279 .iw_rem_ref = siw_qp_put_ref, 280 .map_mr_sg = siw_map_mr_sg, 281 .mmap = siw_mmap, 282 .mmap_free = siw_mmap_free, 283 .modify_qp = siw_verbs_modify_qp, 284 .modify_srq = siw_modify_srq, 285 .poll_cq = siw_poll_cq, 286 .post_recv = siw_post_receive, 287 .post_send = siw_post_send, 288 .post_srq_recv = siw_post_srq_recv, 289 .query_device = siw_query_device, 290 .query_gid = siw_query_gid, 291 .query_port = siw_query_port, 292 .query_qp = siw_query_qp, 293 .query_srq = siw_query_srq, 294 .req_notify_cq = siw_req_notify_cq, 295 .reg_user_mr = siw_reg_user_mr, 296 297 INIT_RDMA_OBJ_SIZE(ib_cq, siw_cq, base_cq), 298 INIT_RDMA_OBJ_SIZE(ib_pd, siw_pd, base_pd), 299 INIT_RDMA_OBJ_SIZE(ib_qp, siw_qp, base_qp), 300 INIT_RDMA_OBJ_SIZE(ib_srq, siw_srq, base_srq), 301 INIT_RDMA_OBJ_SIZE(ib_ucontext, siw_ucontext, base_ucontext), 302 }; 303 304 static struct siw_device *siw_device_create(struct net_device *netdev) 305 { 306 struct siw_device *sdev = NULL; 307 struct ib_device *base_dev; 308 int rv; 309 310 sdev = ib_alloc_device(siw_device, base_dev); 311 if (!sdev) 312 return NULL; 313 314 base_dev = &sdev->base_dev; 315 316 sdev->netdev = netdev; 317 318 if (netdev->type != ARPHRD_LOOPBACK) { 319 addrconf_addr_eui48((unsigned char *)&base_dev->node_guid, 320 netdev->dev_addr); 321 } else { 322 /* 323 * The loopback device does not have a HW address, 324 * but connection mangagement lib expects gid != 0 325 */ 326 size_t len = min_t(size_t, strlen(base_dev->name), 6); 327 char addr[6] = { }; 328 329 memcpy(addr, base_dev->name, len); 330 addrconf_addr_eui48((unsigned char *)&base_dev->node_guid, 331 addr); 332 } 333 334 base_dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_POST_SEND); 335 336 base_dev->node_type = RDMA_NODE_RNIC; 337 memcpy(base_dev->node_desc, SIW_NODE_DESC_COMMON, 338 sizeof(SIW_NODE_DESC_COMMON)); 339 340 /* 341 * Current model (one-to-one device association): 342 * One Softiwarp device per net_device or, equivalently, 343 * per physical port. 344 */ 345 base_dev->phys_port_cnt = 1; 346 base_dev->num_comp_vectors = num_possible_cpus(); 347 348 xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1); 349 xa_init_flags(&sdev->mem_xa, XA_FLAGS_ALLOC1); 350 351 ib_set_device_ops(base_dev, &siw_device_ops); 352 rv = ib_device_set_netdev(base_dev, netdev, 1); 353 if (rv) 354 goto error; 355 356 memcpy(base_dev->iw_ifname, netdev->name, 357 sizeof(base_dev->iw_ifname)); 358 359 /* Disable TCP port mapping */ 360 base_dev->iw_driver_flags = IW_F_NO_PORT_MAP; 361 362 sdev->attrs.max_qp = SIW_MAX_QP; 363 sdev->attrs.max_qp_wr = SIW_MAX_QP_WR; 364 sdev->attrs.max_ord = SIW_MAX_ORD_QP; 365 sdev->attrs.max_ird = SIW_MAX_IRD_QP; 366 sdev->attrs.max_sge = SIW_MAX_SGE; 367 sdev->attrs.max_sge_rd = SIW_MAX_SGE_RD; 368 sdev->attrs.max_cq = SIW_MAX_CQ; 369 sdev->attrs.max_cqe = SIW_MAX_CQE; 370 sdev->attrs.max_mr = SIW_MAX_MR; 371 sdev->attrs.max_pd = SIW_MAX_PD; 372 sdev->attrs.max_mw = SIW_MAX_MW; 373 sdev->attrs.max_srq = SIW_MAX_SRQ; 374 sdev->attrs.max_srq_wr = SIW_MAX_SRQ_WR; 375 sdev->attrs.max_srq_sge = SIW_MAX_SGE; 376 377 INIT_LIST_HEAD(&sdev->cep_list); 378 INIT_LIST_HEAD(&sdev->qp_list); 379 380 atomic_set(&sdev->num_ctx, 0); 381 atomic_set(&sdev->num_srq, 0); 382 atomic_set(&sdev->num_qp, 0); 383 atomic_set(&sdev->num_cq, 0); 384 atomic_set(&sdev->num_mr, 0); 385 atomic_set(&sdev->num_pd, 0); 386 387 sdev->numa_node = dev_to_node(&netdev->dev); 388 spin_lock_init(&sdev->lock); 389 390 return sdev; 391 error: 392 ib_dealloc_device(base_dev); 393 394 return NULL; 395 } 396 397 /* 398 * Network link becomes unavailable. Mark all 399 * affected QP's accordingly. 400 */ 401 static void siw_netdev_down(struct work_struct *work) 402 { 403 struct siw_device *sdev = 404 container_of(work, struct siw_device, netdev_down); 405 406 struct siw_qp_attrs qp_attrs; 407 struct list_head *pos, *tmp; 408 409 memset(&qp_attrs, 0, sizeof(qp_attrs)); 410 qp_attrs.state = SIW_QP_STATE_ERROR; 411 412 list_for_each_safe(pos, tmp, &sdev->qp_list) { 413 struct siw_qp *qp = list_entry(pos, struct siw_qp, devq); 414 415 down_write(&qp->state_lock); 416 WARN_ON(siw_qp_modify(qp, &qp_attrs, SIW_QP_ATTR_STATE)); 417 up_write(&qp->state_lock); 418 } 419 ib_device_put(&sdev->base_dev); 420 } 421 422 static void siw_device_goes_down(struct siw_device *sdev) 423 { 424 if (ib_device_try_get(&sdev->base_dev)) { 425 INIT_WORK(&sdev->netdev_down, siw_netdev_down); 426 schedule_work(&sdev->netdev_down); 427 } 428 } 429 430 static int siw_netdev_event(struct notifier_block *nb, unsigned long event, 431 void *arg) 432 { 433 struct net_device *netdev = netdev_notifier_info_to_dev(arg); 434 struct ib_device *base_dev; 435 struct siw_device *sdev; 436 437 dev_dbg(&netdev->dev, "siw: event %lu\n", event); 438 439 if (dev_net(netdev) != &init_net) 440 return NOTIFY_OK; 441 442 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 443 if (!base_dev) 444 return NOTIFY_OK; 445 446 sdev = to_siw_dev(base_dev); 447 448 switch (event) { 449 case NETDEV_UP: 450 sdev->state = IB_PORT_ACTIVE; 451 siw_port_event(sdev, 1, IB_EVENT_PORT_ACTIVE); 452 break; 453 454 case NETDEV_GOING_DOWN: 455 siw_device_goes_down(sdev); 456 break; 457 458 case NETDEV_DOWN: 459 sdev->state = IB_PORT_DOWN; 460 siw_port_event(sdev, 1, IB_EVENT_PORT_ERR); 461 break; 462 463 case NETDEV_REGISTER: 464 /* 465 * Device registration now handled only by 466 * rdma netlink commands. So it shall be impossible 467 * to end up here with a valid siw device. 468 */ 469 siw_dbg(base_dev, "unexpected NETDEV_REGISTER event\n"); 470 break; 471 472 case NETDEV_UNREGISTER: 473 ib_unregister_device_queued(&sdev->base_dev); 474 break; 475 476 case NETDEV_CHANGEADDR: 477 siw_port_event(sdev, 1, IB_EVENT_LID_CHANGE); 478 break; 479 /* 480 * Todo: Below netdev events are currently not handled. 481 */ 482 case NETDEV_CHANGEMTU: 483 case NETDEV_CHANGE: 484 break; 485 486 default: 487 break; 488 } 489 ib_device_put(&sdev->base_dev); 490 491 return NOTIFY_OK; 492 } 493 494 static struct notifier_block siw_netdev_nb = { 495 .notifier_call = siw_netdev_event, 496 }; 497 498 static int siw_newlink(const char *basedev_name, struct net_device *netdev) 499 { 500 struct ib_device *base_dev; 501 struct siw_device *sdev = NULL; 502 int rv = -ENOMEM; 503 504 if (!siw_dev_qualified(netdev)) 505 return -EINVAL; 506 507 base_dev = ib_device_get_by_netdev(netdev, RDMA_DRIVER_SIW); 508 if (base_dev) { 509 ib_device_put(base_dev); 510 return -EEXIST; 511 } 512 sdev = siw_device_create(netdev); 513 if (sdev) { 514 dev_dbg(&netdev->dev, "siw: new device\n"); 515 516 if (netif_running(netdev) && netif_carrier_ok(netdev)) 517 sdev->state = IB_PORT_ACTIVE; 518 else 519 sdev->state = IB_PORT_DOWN; 520 521 rv = siw_device_register(sdev, basedev_name); 522 if (rv) 523 ib_dealloc_device(&sdev->base_dev); 524 } 525 return rv; 526 } 527 528 static struct rdma_link_ops siw_link_ops = { 529 .type = "siw", 530 .newlink = siw_newlink, 531 }; 532 533 /* 534 * siw_init_module - Initialize Softiwarp module and register with netdev 535 * subsystem. 536 */ 537 static __init int siw_init_module(void) 538 { 539 int rv; 540 int nr_cpu; 541 542 if (SENDPAGE_THRESH < SIW_MAX_INLINE) { 543 pr_info("siw: sendpage threshold too small: %u\n", 544 (int)SENDPAGE_THRESH); 545 rv = -EINVAL; 546 goto out_error; 547 } 548 rv = siw_init_cpulist(); 549 if (rv) 550 goto out_error; 551 552 rv = siw_cm_init(); 553 if (rv) 554 goto out_error; 555 556 if (!siw_create_tx_threads()) { 557 pr_info("siw: Could not start any TX thread\n"); 558 rv = -ENOMEM; 559 goto out_error; 560 } 561 /* 562 * Locate CRC32 algorithm. If unsuccessful, fail 563 * loading siw only, if CRC is required. 564 */ 565 siw_crypto_shash = crypto_alloc_shash("crc32c", 0, 0); 566 if (IS_ERR(siw_crypto_shash)) { 567 pr_info("siw: Loading CRC32c failed: %ld\n", 568 PTR_ERR(siw_crypto_shash)); 569 siw_crypto_shash = NULL; 570 if (mpa_crc_required) { 571 rv = -EOPNOTSUPP; 572 goto out_error; 573 } 574 } 575 rv = register_netdevice_notifier(&siw_netdev_nb); 576 if (rv) 577 goto out_error; 578 579 rdma_link_register(&siw_link_ops); 580 581 pr_info("SoftiWARP attached\n"); 582 return 0; 583 584 out_error: 585 for (nr_cpu = 0; nr_cpu < nr_cpu_ids; nr_cpu++) { 586 if (siw_tx_thread[nr_cpu]) { 587 siw_stop_tx_thread(nr_cpu); 588 siw_tx_thread[nr_cpu] = NULL; 589 } 590 } 591 if (siw_crypto_shash) 592 crypto_free_shash(siw_crypto_shash); 593 594 pr_info("SoftIWARP attach failed. Error: %d\n", rv); 595 596 siw_cm_exit(); 597 siw_destroy_cpulist(); 598 599 return rv; 600 } 601 602 static void __exit siw_exit_module(void) 603 { 604 int cpu; 605 606 for_each_possible_cpu(cpu) { 607 if (siw_tx_thread[cpu]) { 608 siw_stop_tx_thread(cpu); 609 siw_tx_thread[cpu] = NULL; 610 } 611 } 612 unregister_netdevice_notifier(&siw_netdev_nb); 613 rdma_link_unregister(&siw_link_ops); 614 ib_unregister_driver(RDMA_DRIVER_SIW); 615 616 siw_cm_exit(); 617 618 siw_destroy_cpulist(); 619 620 if (siw_crypto_shash) 621 crypto_free_shash(siw_crypto_shash); 622 623 pr_info("SoftiWARP detached\n"); 624 } 625 626 module_init(siw_init_module); 627 module_exit(siw_exit_module); 628 629 MODULE_ALIAS_RDMA_LINK("siw"); 630