1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * IB infrastructure: 6 * Establish SMC-R as an Infiniband Client to be notified about added and 7 * removed IB devices of type RDMA. 8 * Determine device and port characteristics for these IB devices. 9 * 10 * Copyright IBM Corp. 2016 11 * 12 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 13 */ 14 15 #include <linux/etherdevice.h> 16 #include <linux/if_vlan.h> 17 #include <linux/random.h> 18 #include <linux/workqueue.h> 19 #include <linux/scatterlist.h> 20 #include <linux/wait.h> 21 #include <linux/mutex.h> 22 #include <linux/inetdevice.h> 23 #include <rdma/ib_verbs.h> 24 #include <rdma/ib_cache.h> 25 26 #include "smc_pnet.h" 27 #include "smc_ib.h" 28 #include "smc_core.h" 29 #include "smc_wr.h" 30 #include "smc.h" 31 #include "smc_netlink.h" 32 33 #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ 34 35 #define SMC_QP_MIN_RNR_TIMER 5 36 #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ 37 #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ 38 #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ 39 40 struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ 41 .mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex), 42 .list = LIST_HEAD_INIT(smc_ib_devices.list), 43 }; 44 45 u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ 46 47 static int smc_ib_modify_qp_init(struct smc_link *lnk) 48 { 49 struct ib_qp_attr qp_attr; 50 51 memset(&qp_attr, 0, sizeof(qp_attr)); 52 qp_attr.qp_state = IB_QPS_INIT; 53 qp_attr.pkey_index = 0; 54 qp_attr.port_num = lnk->ibport; 55 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE 56 | IB_ACCESS_REMOTE_WRITE; 57 return ib_modify_qp(lnk->roce_qp, &qp_attr, 58 IB_QP_STATE | IB_QP_PKEY_INDEX | 59 IB_QP_ACCESS_FLAGS | IB_QP_PORT); 60 } 61 62 static int smc_ib_modify_qp_rtr(struct smc_link *lnk) 63 { 64 enum ib_qp_attr_mask qp_attr_mask = 65 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | 66 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; 67 struct ib_qp_attr qp_attr; 68 u8 hop_lim = 1; 69 70 memset(&qp_attr, 0, sizeof(qp_attr)); 71 qp_attr.qp_state = IB_QPS_RTR; 72 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); 73 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; 74 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); 75 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway) 76 hop_lim = IPV6_DEFAULT_HOPLIMIT; 77 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, hop_lim, 0); 78 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); 79 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway) 80 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->lgr->nexthop_mac, 81 sizeof(lnk->lgr->nexthop_mac)); 82 else 83 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, 84 sizeof(lnk->peer_mac)); 85 qp_attr.dest_qp_num = lnk->peer_qpn; 86 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ 87 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming 88 * requests 89 */ 90 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; 91 92 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); 93 } 94 95 int smc_ib_modify_qp_rts(struct smc_link *lnk) 96 { 97 struct ib_qp_attr qp_attr; 98 99 memset(&qp_attr, 0, sizeof(qp_attr)); 100 qp_attr.qp_state = IB_QPS_RTS; 101 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ 102 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ 103 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ 104 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ 105 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and 106 * atomic ops allowed 107 */ 108 return ib_modify_qp(lnk->roce_qp, &qp_attr, 109 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | 110 IB_QP_SQ_PSN | IB_QP_RNR_RETRY | 111 IB_QP_MAX_QP_RD_ATOMIC); 112 } 113 114 int smc_ib_modify_qp_error(struct smc_link *lnk) 115 { 116 struct ib_qp_attr qp_attr; 117 118 memset(&qp_attr, 0, sizeof(qp_attr)); 119 qp_attr.qp_state = IB_QPS_ERR; 120 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); 121 } 122 123 int smc_ib_ready_link(struct smc_link *lnk) 124 { 125 struct smc_link_group *lgr = smc_get_lgr(lnk); 126 int rc = 0; 127 128 rc = smc_ib_modify_qp_init(lnk); 129 if (rc) 130 goto out; 131 132 rc = smc_ib_modify_qp_rtr(lnk); 133 if (rc) 134 goto out; 135 smc_wr_remember_qp_attr(lnk); 136 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, 137 IB_CQ_SOLICITED_MASK); 138 if (rc) 139 goto out; 140 rc = smc_wr_rx_post_init(lnk); 141 if (rc) 142 goto out; 143 smc_wr_remember_qp_attr(lnk); 144 145 if (lgr->role == SMC_SERV) { 146 rc = smc_ib_modify_qp_rts(lnk); 147 if (rc) 148 goto out; 149 smc_wr_remember_qp_attr(lnk); 150 } 151 out: 152 return rc; 153 } 154 155 static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) 156 { 157 const struct ib_gid_attr *attr; 158 int rc; 159 160 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); 161 if (IS_ERR(attr)) 162 return -ENODEV; 163 164 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]); 165 rdma_put_gid_attr(attr); 166 return rc; 167 } 168 169 /* Create an identifier unique for this instance of SMC-R. 170 * The MAC-address of the first active registered IB device 171 * plus a random 2-byte number is used to create this identifier. 172 * This name is delivered to the peer during connection initialization. 173 */ 174 static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, 175 u8 ibport) 176 { 177 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], 178 sizeof(smcibdev->mac[ibport - 1])); 179 } 180 181 bool smc_ib_is_valid_local_systemid(void) 182 { 183 return !is_zero_ether_addr(&local_systemid[2]); 184 } 185 186 static void smc_ib_init_local_systemid(void) 187 { 188 get_random_bytes(&local_systemid[0], 2); 189 } 190 191 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) 192 { 193 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; 194 } 195 196 int smc_ib_find_route(struct net *net, __be32 saddr, __be32 daddr, 197 u8 nexthop_mac[], u8 *uses_gateway) 198 { 199 struct neighbour *neigh = NULL; 200 struct rtable *rt = NULL; 201 struct flowi4 fl4 = { 202 .saddr = saddr, 203 .daddr = daddr 204 }; 205 206 if (daddr == cpu_to_be32(INADDR_NONE)) 207 goto out; 208 rt = ip_route_output_flow(net, &fl4, NULL); 209 if (IS_ERR(rt)) 210 goto out; 211 if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET) 212 goto out; 213 neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr); 214 if (neigh) { 215 memcpy(nexthop_mac, neigh->ha, ETH_ALEN); 216 *uses_gateway = rt->rt_uses_gateway; 217 return 0; 218 } 219 out: 220 return -ENOENT; 221 } 222 223 static int smc_ib_determine_gid_rcu(const struct net_device *ndev, 224 const struct ib_gid_attr *attr, 225 u8 gid[], u8 *sgid_index, 226 struct smc_init_info_smcrv2 *smcrv2) 227 { 228 if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) { 229 if (gid) 230 memcpy(gid, &attr->gid, SMC_GID_SIZE); 231 if (sgid_index) 232 *sgid_index = attr->index; 233 return 0; 234 } 235 if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP && 236 smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) { 237 struct in_device *in_dev = __in_dev_get_rcu(ndev); 238 struct net *net = dev_net(ndev); 239 const struct in_ifaddr *ifa; 240 bool subnet_match = false; 241 242 if (!in_dev) 243 goto out; 244 in_dev_for_each_ifa_rcu(ifa, in_dev) { 245 if (!inet_ifa_match(smcrv2->saddr, ifa)) 246 continue; 247 subnet_match = true; 248 break; 249 } 250 if (!subnet_match) 251 goto out; 252 if (smcrv2->daddr && smc_ib_find_route(net, smcrv2->saddr, 253 smcrv2->daddr, 254 smcrv2->nexthop_mac, 255 &smcrv2->uses_gateway)) 256 goto out; 257 258 if (gid) 259 memcpy(gid, &attr->gid, SMC_GID_SIZE); 260 if (sgid_index) 261 *sgid_index = attr->index; 262 return 0; 263 } 264 out: 265 return -ENODEV; 266 } 267 268 /* determine the gid for an ib-device port and vlan id */ 269 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 270 unsigned short vlan_id, u8 gid[], u8 *sgid_index, 271 struct smc_init_info_smcrv2 *smcrv2) 272 { 273 const struct ib_gid_attr *attr; 274 const struct net_device *ndev; 275 int i; 276 277 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 278 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 279 if (IS_ERR(attr)) 280 continue; 281 282 rcu_read_lock(); 283 ndev = rdma_read_gid_attr_ndev_rcu(attr); 284 if (!IS_ERR(ndev) && 285 ((!vlan_id && !is_vlan_dev(ndev)) || 286 (vlan_id && is_vlan_dev(ndev) && 287 vlan_dev_vlan_id(ndev) == vlan_id))) { 288 if (!smc_ib_determine_gid_rcu(ndev, attr, gid, 289 sgid_index, smcrv2)) { 290 rcu_read_unlock(); 291 rdma_put_gid_attr(attr); 292 return 0; 293 } 294 } 295 rcu_read_unlock(); 296 rdma_put_gid_attr(attr); 297 } 298 return -ENODEV; 299 } 300 301 /* check if gid is still defined on smcibdev */ 302 static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2, 303 struct smc_ib_device *smcibdev, u8 ibport) 304 { 305 const struct ib_gid_attr *attr; 306 bool rc = false; 307 int i; 308 309 for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 310 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 311 if (IS_ERR(attr)) 312 continue; 313 314 rcu_read_lock(); 315 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) || 316 (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP && 317 !(ipv6_addr_type((const struct in6_addr *)&attr->gid) 318 & IPV6_ADDR_LINKLOCAL))) 319 if (!memcmp(gid, &attr->gid, SMC_GID_SIZE)) 320 rc = true; 321 rcu_read_unlock(); 322 rdma_put_gid_attr(attr); 323 } 324 return rc; 325 } 326 327 /* check all links if the gid is still defined on smcibdev */ 328 static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport) 329 { 330 struct smc_link_group *lgr; 331 int i; 332 333 spin_lock_bh(&smc_lgr_list.lock); 334 list_for_each_entry(lgr, &smc_lgr_list.list, list) { 335 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 336 SMC_MAX_PNETID_LEN)) 337 continue; /* lgr is not affected */ 338 if (list_empty(&lgr->list)) 339 continue; 340 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 341 if (lgr->lnk[i].state == SMC_LNK_UNUSED || 342 lgr->lnk[i].smcibdev != smcibdev) 343 continue; 344 if (!smc_ib_check_link_gid(lgr->lnk[i].gid, 345 lgr->smc_version == SMC_V2, 346 smcibdev, ibport)) 347 smcr_port_err(smcibdev, ibport); 348 } 349 } 350 spin_unlock_bh(&smc_lgr_list.lock); 351 } 352 353 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 354 { 355 int rc; 356 357 memset(&smcibdev->pattr[ibport - 1], 0, 358 sizeof(smcibdev->pattr[ibport - 1])); 359 rc = ib_query_port(smcibdev->ibdev, ibport, 360 &smcibdev->pattr[ibport - 1]); 361 if (rc) 362 goto out; 363 /* the SMC protocol requires specification of the RoCE MAC address */ 364 rc = smc_ib_fill_mac(smcibdev, ibport); 365 if (rc) 366 goto out; 367 if (!smc_ib_is_valid_local_systemid() && 368 smc_ib_port_active(smcibdev, ibport)) 369 /* create unique system identifier */ 370 smc_ib_define_local_systemid(smcibdev, ibport); 371 out: 372 return rc; 373 } 374 375 /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 376 static void smc_ib_port_event_work(struct work_struct *work) 377 { 378 struct smc_ib_device *smcibdev = container_of( 379 work, struct smc_ib_device, port_event_work); 380 u8 port_idx; 381 382 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 383 smc_ib_remember_port_attr(smcibdev, port_idx + 1); 384 clear_bit(port_idx, &smcibdev->port_event_mask); 385 if (!smc_ib_port_active(smcibdev, port_idx + 1)) { 386 set_bit(port_idx, smcibdev->ports_going_away); 387 smcr_port_err(smcibdev, port_idx + 1); 388 } else { 389 clear_bit(port_idx, smcibdev->ports_going_away); 390 smcr_port_add(smcibdev, port_idx + 1); 391 smc_ib_gid_check(smcibdev, port_idx + 1); 392 } 393 } 394 } 395 396 /* can be called in IRQ context */ 397 static void smc_ib_global_event_handler(struct ib_event_handler *handler, 398 struct ib_event *ibevent) 399 { 400 struct smc_ib_device *smcibdev; 401 bool schedule = false; 402 u8 port_idx; 403 404 smcibdev = container_of(handler, struct smc_ib_device, event_handler); 405 406 switch (ibevent->event) { 407 case IB_EVENT_DEVICE_FATAL: 408 /* terminate all ports on device */ 409 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 410 set_bit(port_idx, &smcibdev->port_event_mask); 411 if (!test_and_set_bit(port_idx, 412 smcibdev->ports_going_away)) 413 schedule = true; 414 } 415 if (schedule) 416 schedule_work(&smcibdev->port_event_work); 417 break; 418 case IB_EVENT_PORT_ACTIVE: 419 port_idx = ibevent->element.port_num - 1; 420 if (port_idx >= SMC_MAX_PORTS) 421 break; 422 set_bit(port_idx, &smcibdev->port_event_mask); 423 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) 424 schedule_work(&smcibdev->port_event_work); 425 break; 426 case IB_EVENT_PORT_ERR: 427 port_idx = ibevent->element.port_num - 1; 428 if (port_idx >= SMC_MAX_PORTS) 429 break; 430 set_bit(port_idx, &smcibdev->port_event_mask); 431 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 432 schedule_work(&smcibdev->port_event_work); 433 break; 434 case IB_EVENT_GID_CHANGE: 435 port_idx = ibevent->element.port_num - 1; 436 if (port_idx >= SMC_MAX_PORTS) 437 break; 438 set_bit(port_idx, &smcibdev->port_event_mask); 439 schedule_work(&smcibdev->port_event_work); 440 break; 441 default: 442 break; 443 } 444 } 445 446 void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 447 { 448 if (lnk->roce_pd) 449 ib_dealloc_pd(lnk->roce_pd); 450 lnk->roce_pd = NULL; 451 } 452 453 int smc_ib_create_protection_domain(struct smc_link *lnk) 454 { 455 int rc; 456 457 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 458 rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 459 if (IS_ERR(lnk->roce_pd)) 460 lnk->roce_pd = NULL; 461 return rc; 462 } 463 464 static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr, 465 struct smc_ib_device *smcibdev) 466 { 467 struct smc_link_group *lgr; 468 bool rc = false; 469 int i; 470 471 spin_lock_bh(&smc_lgr->lock); 472 list_for_each_entry(lgr, &smc_lgr->list, list) { 473 if (lgr->is_smcd) 474 continue; 475 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 476 if (lgr->lnk[i].state == SMC_LNK_UNUSED || 477 lgr->lnk[i].smcibdev != smcibdev) 478 continue; 479 if (lgr->type == SMC_LGR_SINGLE || 480 lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) { 481 rc = true; 482 goto out; 483 } 484 } 485 } 486 out: 487 spin_unlock_bh(&smc_lgr->lock); 488 return rc; 489 } 490 491 static int smc_nl_handle_dev_port(struct sk_buff *skb, 492 struct ib_device *ibdev, 493 struct smc_ib_device *smcibdev, 494 int port) 495 { 496 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 497 struct nlattr *port_attrs; 498 unsigned char port_state; 499 int lnk_count = 0; 500 501 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port); 502 if (!port_attrs) 503 goto errout; 504 505 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, 506 smcibdev->pnetid_by_user[port])) 507 goto errattr; 508 memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN); 509 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 510 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet)) 511 goto errattr; 512 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV, 513 smcibdev->ndev_ifidx[port])) 514 goto errattr; 515 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1)) 516 goto errattr; 517 port_state = smc_ib_port_active(smcibdev, port + 1); 518 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state)) 519 goto errattr; 520 lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]); 521 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count)) 522 goto errattr; 523 nla_nest_end(skb, port_attrs); 524 return 0; 525 errattr: 526 nla_nest_cancel(skb, port_attrs); 527 errout: 528 return -EMSGSIZE; 529 } 530 531 static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev, 532 struct sk_buff *skb) 533 { 534 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid)) 535 return false; 536 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid)) 537 return false; 538 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor)) 539 return false; 540 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device)) 541 return false; 542 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id)) 543 return false; 544 return true; 545 } 546 547 static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev, 548 struct sk_buff *skb, 549 struct netlink_callback *cb) 550 { 551 char smc_ibname[IB_DEVICE_NAME_MAX]; 552 struct smc_pci_dev smc_pci_dev; 553 struct pci_dev *pci_dev; 554 unsigned char is_crit; 555 struct nlattr *attrs; 556 void *nlh; 557 int i; 558 559 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 560 &smc_gen_nl_family, NLM_F_MULTI, 561 SMC_NETLINK_GET_DEV_SMCR); 562 if (!nlh) 563 goto errmsg; 564 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR); 565 if (!attrs) 566 goto errout; 567 is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev); 568 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit)) 569 goto errattr; 570 if (smcibdev->ibdev->dev.parent) { 571 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev)); 572 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent); 573 smc_set_pci_values(pci_dev, &smc_pci_dev); 574 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb)) 575 goto errattr; 576 } 577 snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name); 578 if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname)) 579 goto errattr; 580 for (i = 1; i <= SMC_MAX_PORTS; i++) { 581 if (!rdma_is_port_valid(smcibdev->ibdev, i)) 582 continue; 583 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev, 584 smcibdev, i - 1)) 585 goto errattr; 586 } 587 588 nla_nest_end(skb, attrs); 589 genlmsg_end(skb, nlh); 590 return 0; 591 592 errattr: 593 nla_nest_cancel(skb, attrs); 594 errout: 595 genlmsg_cancel(skb, nlh); 596 errmsg: 597 return -EMSGSIZE; 598 } 599 600 static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list, 601 struct sk_buff *skb, 602 struct netlink_callback *cb) 603 { 604 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 605 struct smc_ib_device *smcibdev; 606 int snum = cb_ctx->pos[0]; 607 int num = 0; 608 609 mutex_lock(&dev_list->mutex); 610 list_for_each_entry(smcibdev, &dev_list->list, list) { 611 if (num < snum) 612 goto next; 613 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb)) 614 goto errout; 615 next: 616 num++; 617 } 618 errout: 619 mutex_unlock(&dev_list->mutex); 620 cb_ctx->pos[0] = num; 621 } 622 623 int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb) 624 { 625 smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb); 626 return skb->len; 627 } 628 629 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 630 { 631 struct smc_link *lnk = (struct smc_link *)priv; 632 struct smc_ib_device *smcibdev = lnk->smcibdev; 633 u8 port_idx; 634 635 switch (ibevent->event) { 636 case IB_EVENT_QP_FATAL: 637 case IB_EVENT_QP_ACCESS_ERR: 638 port_idx = ibevent->element.qp->port - 1; 639 if (port_idx >= SMC_MAX_PORTS) 640 break; 641 set_bit(port_idx, &smcibdev->port_event_mask); 642 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 643 schedule_work(&smcibdev->port_event_work); 644 break; 645 default: 646 break; 647 } 648 } 649 650 void smc_ib_destroy_queue_pair(struct smc_link *lnk) 651 { 652 if (lnk->roce_qp) 653 ib_destroy_qp(lnk->roce_qp); 654 lnk->roce_qp = NULL; 655 } 656 657 /* create a queue pair within the protection domain for a link */ 658 int smc_ib_create_queue_pair(struct smc_link *lnk) 659 { 660 int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1; 661 struct ib_qp_init_attr qp_attr = { 662 .event_handler = smc_ib_qp_event_handler, 663 .qp_context = lnk, 664 .send_cq = lnk->smcibdev->roce_cq_send, 665 .recv_cq = lnk->smcibdev->roce_cq_recv, 666 .srq = NULL, 667 .cap = { 668 /* include unsolicited rdma_writes as well, 669 * there are max. 2 RDMA_WRITE per 1 WR_SEND 670 */ 671 .max_send_wr = SMC_WR_BUF_CNT * 3, 672 .max_recv_wr = SMC_WR_BUF_CNT * 3, 673 .max_send_sge = SMC_IB_MAX_SEND_SGE, 674 .max_recv_sge = sges_per_buf, 675 .max_inline_data = 0, 676 }, 677 .sq_sig_type = IB_SIGNAL_REQ_WR, 678 .qp_type = IB_QPT_RC, 679 }; 680 int rc; 681 682 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 683 rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 684 if (IS_ERR(lnk->roce_qp)) 685 lnk->roce_qp = NULL; 686 else 687 smc_wr_remember_qp_attr(lnk); 688 return rc; 689 } 690 691 void smc_ib_put_memory_region(struct ib_mr *mr) 692 { 693 ib_dereg_mr(mr); 694 } 695 696 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx) 697 { 698 unsigned int offset = 0; 699 int sg_num; 700 701 /* map the largest prefix of a dma mapped SG list */ 702 sg_num = ib_map_mr_sg(buf_slot->mr[link_idx], 703 buf_slot->sgt[link_idx].sgl, 704 buf_slot->sgt[link_idx].orig_nents, 705 &offset, PAGE_SIZE); 706 707 return sg_num; 708 } 709 710 /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 711 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 712 struct smc_buf_desc *buf_slot, u8 link_idx) 713 { 714 if (buf_slot->mr[link_idx]) 715 return 0; /* already done */ 716 717 buf_slot->mr[link_idx] = 718 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 719 if (IS_ERR(buf_slot->mr[link_idx])) { 720 int rc; 721 722 rc = PTR_ERR(buf_slot->mr[link_idx]); 723 buf_slot->mr[link_idx] = NULL; 724 return rc; 725 } 726 727 if (smc_ib_map_mr_sg(buf_slot, link_idx) != 728 buf_slot->sgt[link_idx].orig_nents) 729 return -EINVAL; 730 731 return 0; 732 } 733 734 bool smc_ib_is_sg_need_sync(struct smc_link *lnk, 735 struct smc_buf_desc *buf_slot) 736 { 737 struct scatterlist *sg; 738 unsigned int i; 739 bool ret = false; 740 741 /* for now there is just one DMA address */ 742 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 743 buf_slot->sgt[lnk->link_idx].nents, i) { 744 if (!sg_dma_len(sg)) 745 break; 746 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device, 747 sg_dma_address(sg))) { 748 ret = true; 749 goto out; 750 } 751 } 752 753 out: 754 return ret; 755 } 756 757 /* synchronize buffer usage for cpu access */ 758 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk, 759 struct smc_buf_desc *buf_slot, 760 enum dma_data_direction data_direction) 761 { 762 struct scatterlist *sg; 763 unsigned int i; 764 765 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx))) 766 return; 767 768 /* for now there is just one DMA address */ 769 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 770 buf_slot->sgt[lnk->link_idx].nents, i) { 771 if (!sg_dma_len(sg)) 772 break; 773 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev, 774 sg_dma_address(sg), 775 sg_dma_len(sg), 776 data_direction); 777 } 778 } 779 780 /* synchronize buffer usage for device access */ 781 void smc_ib_sync_sg_for_device(struct smc_link *lnk, 782 struct smc_buf_desc *buf_slot, 783 enum dma_data_direction data_direction) 784 { 785 struct scatterlist *sg; 786 unsigned int i; 787 788 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx))) 789 return; 790 791 /* for now there is just one DMA address */ 792 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 793 buf_slot->sgt[lnk->link_idx].nents, i) { 794 if (!sg_dma_len(sg)) 795 break; 796 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev, 797 sg_dma_address(sg), 798 sg_dma_len(sg), 799 data_direction); 800 } 801 } 802 803 /* Map a new TX or RX buffer SG-table to DMA */ 804 int smc_ib_buf_map_sg(struct smc_link *lnk, 805 struct smc_buf_desc *buf_slot, 806 enum dma_data_direction data_direction) 807 { 808 int mapped_nents; 809 810 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev, 811 buf_slot->sgt[lnk->link_idx].sgl, 812 buf_slot->sgt[lnk->link_idx].orig_nents, 813 data_direction); 814 if (!mapped_nents) 815 return -ENOMEM; 816 817 return mapped_nents; 818 } 819 820 void smc_ib_buf_unmap_sg(struct smc_link *lnk, 821 struct smc_buf_desc *buf_slot, 822 enum dma_data_direction data_direction) 823 { 824 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address) 825 return; /* already unmapped */ 826 827 ib_dma_unmap_sg(lnk->smcibdev->ibdev, 828 buf_slot->sgt[lnk->link_idx].sgl, 829 buf_slot->sgt[lnk->link_idx].orig_nents, 830 data_direction); 831 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0; 832 } 833 834 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 835 { 836 struct ib_cq_init_attr cqattr = { 837 .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 838 int cqe_size_order, smc_order; 839 long rc; 840 841 mutex_lock(&smcibdev->mutex); 842 rc = 0; 843 if (smcibdev->initialized) 844 goto out; 845 /* the calculated number of cq entries fits to mlx5 cq allocation */ 846 cqe_size_order = cache_line_size() == 128 ? 7 : 6; 847 smc_order = MAX_PAGE_ORDER - cqe_size_order; 848 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 849 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 850 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 851 smc_wr_tx_cq_handler, NULL, 852 smcibdev, &cqattr); 853 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 854 if (IS_ERR(smcibdev->roce_cq_send)) { 855 smcibdev->roce_cq_send = NULL; 856 goto out; 857 } 858 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 859 smc_wr_rx_cq_handler, NULL, 860 smcibdev, &cqattr); 861 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 862 if (IS_ERR(smcibdev->roce_cq_recv)) { 863 smcibdev->roce_cq_recv = NULL; 864 goto err; 865 } 866 smc_wr_add_dev(smcibdev); 867 smcibdev->initialized = 1; 868 goto out; 869 870 err: 871 ib_destroy_cq(smcibdev->roce_cq_send); 872 out: 873 mutex_unlock(&smcibdev->mutex); 874 return rc; 875 } 876 877 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 878 { 879 mutex_lock(&smcibdev->mutex); 880 if (!smcibdev->initialized) 881 goto out; 882 smcibdev->initialized = 0; 883 ib_destroy_cq(smcibdev->roce_cq_recv); 884 ib_destroy_cq(smcibdev->roce_cq_send); 885 smc_wr_remove_dev(smcibdev); 886 out: 887 mutex_unlock(&smcibdev->mutex); 888 } 889 890 static struct ib_client smc_ib_client; 891 892 static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port) 893 { 894 struct ib_device *ibdev = smcibdev->ibdev; 895 struct net_device *ndev; 896 897 if (!ibdev->ops.get_netdev) 898 return; 899 ndev = ibdev->ops.get_netdev(ibdev, port + 1); 900 if (ndev) { 901 smcibdev->ndev_ifidx[port] = ndev->ifindex; 902 dev_put(ndev); 903 } 904 } 905 906 void smc_ib_ndev_change(struct net_device *ndev, unsigned long event) 907 { 908 struct smc_ib_device *smcibdev; 909 struct ib_device *libdev; 910 struct net_device *lndev; 911 u8 port_cnt; 912 int i; 913 914 mutex_lock(&smc_ib_devices.mutex); 915 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 916 port_cnt = smcibdev->ibdev->phys_port_cnt; 917 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) { 918 libdev = smcibdev->ibdev; 919 if (!libdev->ops.get_netdev) 920 continue; 921 lndev = libdev->ops.get_netdev(libdev, i + 1); 922 dev_put(lndev); 923 if (lndev != ndev) 924 continue; 925 if (event == NETDEV_REGISTER) 926 smcibdev->ndev_ifidx[i] = ndev->ifindex; 927 if (event == NETDEV_UNREGISTER) 928 smcibdev->ndev_ifidx[i] = 0; 929 } 930 } 931 mutex_unlock(&smc_ib_devices.mutex); 932 } 933 934 /* callback function for ib_register_client() */ 935 static int smc_ib_add_dev(struct ib_device *ibdev) 936 { 937 struct smc_ib_device *smcibdev; 938 u8 port_cnt; 939 int i; 940 941 if (ibdev->node_type != RDMA_NODE_IB_CA) 942 return -EOPNOTSUPP; 943 944 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 945 if (!smcibdev) 946 return -ENOMEM; 947 948 smcibdev->ibdev = ibdev; 949 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 950 atomic_set(&smcibdev->lnk_cnt, 0); 951 init_waitqueue_head(&smcibdev->lnks_deleted); 952 mutex_init(&smcibdev->mutex); 953 mutex_lock(&smc_ib_devices.mutex); 954 list_add_tail(&smcibdev->list, &smc_ib_devices.list); 955 mutex_unlock(&smc_ib_devices.mutex); 956 ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 957 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 958 smc_ib_global_event_handler); 959 ib_register_event_handler(&smcibdev->event_handler); 960 961 /* trigger reading of the port attributes */ 962 port_cnt = smcibdev->ibdev->phys_port_cnt; 963 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n", 964 smcibdev->ibdev->name, port_cnt); 965 for (i = 0; 966 i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 967 i++) { 968 set_bit(i, &smcibdev->port_event_mask); 969 /* determine pnetids of the port */ 970 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i, 971 smcibdev->pnetid[i])) 972 smc_pnetid_by_table_ib(smcibdev, i + 1); 973 smc_copy_netdev_ifindex(smcibdev, i); 974 pr_warn_ratelimited("smc: ib device %s port %d has pnetid " 975 "%.16s%s\n", 976 smcibdev->ibdev->name, i + 1, 977 smcibdev->pnetid[i], 978 smcibdev->pnetid_by_user[i] ? 979 " (user defined)" : 980 ""); 981 } 982 schedule_work(&smcibdev->port_event_work); 983 return 0; 984 } 985 986 /* callback function for ib_unregister_client() */ 987 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 988 { 989 struct smc_ib_device *smcibdev = client_data; 990 991 mutex_lock(&smc_ib_devices.mutex); 992 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 993 mutex_unlock(&smc_ib_devices.mutex); 994 pr_warn_ratelimited("smc: removing ib device %s\n", 995 smcibdev->ibdev->name); 996 smc_smcr_terminate_all(smcibdev); 997 smc_ib_cleanup_per_ibdev(smcibdev); 998 ib_unregister_event_handler(&smcibdev->event_handler); 999 cancel_work_sync(&smcibdev->port_event_work); 1000 kfree(smcibdev); 1001 } 1002 1003 static struct ib_client smc_ib_client = { 1004 .name = "smc_ib", 1005 .add = smc_ib_add_dev, 1006 .remove = smc_ib_remove_dev, 1007 }; 1008 1009 int __init smc_ib_register_client(void) 1010 { 1011 smc_ib_init_local_systemid(); 1012 return ib_register_client(&smc_ib_client); 1013 } 1014 1015 void smc_ib_unregister_client(void) 1016 { 1017 ib_unregister_client(&smc_ib_client); 1018 } 1019