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(__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(&init_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 const struct in_ifaddr *ifa; 239 bool subnet_match = false; 240 241 if (!in_dev) 242 goto out; 243 in_dev_for_each_ifa_rcu(ifa, in_dev) { 244 if (!inet_ifa_match(smcrv2->saddr, ifa)) 245 continue; 246 subnet_match = true; 247 break; 248 } 249 if (!subnet_match) 250 goto out; 251 if (smcrv2->daddr && smc_ib_find_route(smcrv2->saddr, 252 smcrv2->daddr, 253 smcrv2->nexthop_mac, 254 &smcrv2->uses_gateway)) 255 goto out; 256 257 if (gid) 258 memcpy(gid, &attr->gid, SMC_GID_SIZE); 259 if (sgid_index) 260 *sgid_index = attr->index; 261 return 0; 262 } 263 out: 264 return -ENODEV; 265 } 266 267 /* determine the gid for an ib-device port and vlan id */ 268 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, 269 unsigned short vlan_id, u8 gid[], u8 *sgid_index, 270 struct smc_init_info_smcrv2 *smcrv2) 271 { 272 const struct ib_gid_attr *attr; 273 const struct net_device *ndev; 274 int i; 275 276 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 277 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 278 if (IS_ERR(attr)) 279 continue; 280 281 rcu_read_lock(); 282 ndev = rdma_read_gid_attr_ndev_rcu(attr); 283 if (!IS_ERR(ndev) && 284 ((!vlan_id && !is_vlan_dev(ndev)) || 285 (vlan_id && is_vlan_dev(ndev) && 286 vlan_dev_vlan_id(ndev) == vlan_id))) { 287 if (!smc_ib_determine_gid_rcu(ndev, attr, gid, 288 sgid_index, smcrv2)) { 289 rcu_read_unlock(); 290 rdma_put_gid_attr(attr); 291 return 0; 292 } 293 } 294 rcu_read_unlock(); 295 rdma_put_gid_attr(attr); 296 } 297 return -ENODEV; 298 } 299 300 /* check if gid is still defined on smcibdev */ 301 static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2, 302 struct smc_ib_device *smcibdev, u8 ibport) 303 { 304 const struct ib_gid_attr *attr; 305 bool rc = false; 306 int i; 307 308 for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { 309 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); 310 if (IS_ERR(attr)) 311 continue; 312 313 rcu_read_lock(); 314 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) || 315 (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP && 316 !(ipv6_addr_type((const struct in6_addr *)&attr->gid) 317 & IPV6_ADDR_LINKLOCAL))) 318 if (!memcmp(gid, &attr->gid, SMC_GID_SIZE)) 319 rc = true; 320 rcu_read_unlock(); 321 rdma_put_gid_attr(attr); 322 } 323 return rc; 324 } 325 326 /* check all links if the gid is still defined on smcibdev */ 327 static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport) 328 { 329 struct smc_link_group *lgr; 330 int i; 331 332 spin_lock_bh(&smc_lgr_list.lock); 333 list_for_each_entry(lgr, &smc_lgr_list.list, list) { 334 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 335 SMC_MAX_PNETID_LEN)) 336 continue; /* lgr is not affected */ 337 if (list_empty(&lgr->list)) 338 continue; 339 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 340 if (lgr->lnk[i].state == SMC_LNK_UNUSED || 341 lgr->lnk[i].smcibdev != smcibdev) 342 continue; 343 if (!smc_ib_check_link_gid(lgr->lnk[i].gid, 344 lgr->smc_version == SMC_V2, 345 smcibdev, ibport)) 346 smcr_port_err(smcibdev, ibport); 347 } 348 } 349 spin_unlock_bh(&smc_lgr_list.lock); 350 } 351 352 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) 353 { 354 int rc; 355 356 memset(&smcibdev->pattr[ibport - 1], 0, 357 sizeof(smcibdev->pattr[ibport - 1])); 358 rc = ib_query_port(smcibdev->ibdev, ibport, 359 &smcibdev->pattr[ibport - 1]); 360 if (rc) 361 goto out; 362 /* the SMC protocol requires specification of the RoCE MAC address */ 363 rc = smc_ib_fill_mac(smcibdev, ibport); 364 if (rc) 365 goto out; 366 if (!smc_ib_is_valid_local_systemid() && 367 smc_ib_port_active(smcibdev, ibport)) 368 /* create unique system identifier */ 369 smc_ib_define_local_systemid(smcibdev, ibport); 370 out: 371 return rc; 372 } 373 374 /* process context wrapper for might_sleep smc_ib_remember_port_attr */ 375 static void smc_ib_port_event_work(struct work_struct *work) 376 { 377 struct smc_ib_device *smcibdev = container_of( 378 work, struct smc_ib_device, port_event_work); 379 u8 port_idx; 380 381 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { 382 smc_ib_remember_port_attr(smcibdev, port_idx + 1); 383 clear_bit(port_idx, &smcibdev->port_event_mask); 384 if (!smc_ib_port_active(smcibdev, port_idx + 1)) { 385 set_bit(port_idx, smcibdev->ports_going_away); 386 smcr_port_err(smcibdev, port_idx + 1); 387 } else { 388 clear_bit(port_idx, smcibdev->ports_going_away); 389 smcr_port_add(smcibdev, port_idx + 1); 390 smc_ib_gid_check(smcibdev, port_idx + 1); 391 } 392 } 393 } 394 395 /* can be called in IRQ context */ 396 static void smc_ib_global_event_handler(struct ib_event_handler *handler, 397 struct ib_event *ibevent) 398 { 399 struct smc_ib_device *smcibdev; 400 bool schedule = false; 401 u8 port_idx; 402 403 smcibdev = container_of(handler, struct smc_ib_device, event_handler); 404 405 switch (ibevent->event) { 406 case IB_EVENT_DEVICE_FATAL: 407 /* terminate all ports on device */ 408 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { 409 set_bit(port_idx, &smcibdev->port_event_mask); 410 if (!test_and_set_bit(port_idx, 411 smcibdev->ports_going_away)) 412 schedule = true; 413 } 414 if (schedule) 415 schedule_work(&smcibdev->port_event_work); 416 break; 417 case IB_EVENT_PORT_ACTIVE: 418 port_idx = ibevent->element.port_num - 1; 419 if (port_idx >= SMC_MAX_PORTS) 420 break; 421 set_bit(port_idx, &smcibdev->port_event_mask); 422 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) 423 schedule_work(&smcibdev->port_event_work); 424 break; 425 case IB_EVENT_PORT_ERR: 426 port_idx = ibevent->element.port_num - 1; 427 if (port_idx >= SMC_MAX_PORTS) 428 break; 429 set_bit(port_idx, &smcibdev->port_event_mask); 430 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 431 schedule_work(&smcibdev->port_event_work); 432 break; 433 case IB_EVENT_GID_CHANGE: 434 port_idx = ibevent->element.port_num - 1; 435 if (port_idx >= SMC_MAX_PORTS) 436 break; 437 set_bit(port_idx, &smcibdev->port_event_mask); 438 schedule_work(&smcibdev->port_event_work); 439 break; 440 default: 441 break; 442 } 443 } 444 445 void smc_ib_dealloc_protection_domain(struct smc_link *lnk) 446 { 447 if (lnk->roce_pd) 448 ib_dealloc_pd(lnk->roce_pd); 449 lnk->roce_pd = NULL; 450 } 451 452 int smc_ib_create_protection_domain(struct smc_link *lnk) 453 { 454 int rc; 455 456 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); 457 rc = PTR_ERR_OR_ZERO(lnk->roce_pd); 458 if (IS_ERR(lnk->roce_pd)) 459 lnk->roce_pd = NULL; 460 return rc; 461 } 462 463 static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr, 464 struct smc_ib_device *smcibdev) 465 { 466 struct smc_link_group *lgr; 467 bool rc = false; 468 int i; 469 470 spin_lock_bh(&smc_lgr->lock); 471 list_for_each_entry(lgr, &smc_lgr->list, list) { 472 if (lgr->is_smcd) 473 continue; 474 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 475 if (lgr->lnk[i].state == SMC_LNK_UNUSED || 476 lgr->lnk[i].smcibdev != smcibdev) 477 continue; 478 if (lgr->type == SMC_LGR_SINGLE || 479 lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) { 480 rc = true; 481 goto out; 482 } 483 } 484 } 485 out: 486 spin_unlock_bh(&smc_lgr->lock); 487 return rc; 488 } 489 490 static int smc_nl_handle_dev_port(struct sk_buff *skb, 491 struct ib_device *ibdev, 492 struct smc_ib_device *smcibdev, 493 int port) 494 { 495 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 496 struct nlattr *port_attrs; 497 unsigned char port_state; 498 int lnk_count = 0; 499 500 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port); 501 if (!port_attrs) 502 goto errout; 503 504 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, 505 smcibdev->pnetid_by_user[port])) 506 goto errattr; 507 memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN); 508 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 509 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet)) 510 goto errattr; 511 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV, 512 smcibdev->ndev_ifidx[port])) 513 goto errattr; 514 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1)) 515 goto errattr; 516 port_state = smc_ib_port_active(smcibdev, port + 1); 517 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state)) 518 goto errattr; 519 lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]); 520 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count)) 521 goto errattr; 522 nla_nest_end(skb, port_attrs); 523 return 0; 524 errattr: 525 nla_nest_cancel(skb, port_attrs); 526 errout: 527 return -EMSGSIZE; 528 } 529 530 static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev, 531 struct sk_buff *skb) 532 { 533 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid)) 534 return false; 535 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid)) 536 return false; 537 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor)) 538 return false; 539 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device)) 540 return false; 541 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id)) 542 return false; 543 return true; 544 } 545 546 static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev, 547 struct sk_buff *skb, 548 struct netlink_callback *cb) 549 { 550 char smc_ibname[IB_DEVICE_NAME_MAX]; 551 struct smc_pci_dev smc_pci_dev; 552 struct pci_dev *pci_dev; 553 unsigned char is_crit; 554 struct nlattr *attrs; 555 void *nlh; 556 int i; 557 558 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 559 &smc_gen_nl_family, NLM_F_MULTI, 560 SMC_NETLINK_GET_DEV_SMCR); 561 if (!nlh) 562 goto errmsg; 563 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR); 564 if (!attrs) 565 goto errout; 566 is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev); 567 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit)) 568 goto errattr; 569 if (smcibdev->ibdev->dev.parent) { 570 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev)); 571 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent); 572 smc_set_pci_values(pci_dev, &smc_pci_dev); 573 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb)) 574 goto errattr; 575 } 576 snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name); 577 if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname)) 578 goto errattr; 579 for (i = 1; i <= SMC_MAX_PORTS; i++) { 580 if (!rdma_is_port_valid(smcibdev->ibdev, i)) 581 continue; 582 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev, 583 smcibdev, i - 1)) 584 goto errattr; 585 } 586 587 nla_nest_end(skb, attrs); 588 genlmsg_end(skb, nlh); 589 return 0; 590 591 errattr: 592 nla_nest_cancel(skb, attrs); 593 errout: 594 genlmsg_cancel(skb, nlh); 595 errmsg: 596 return -EMSGSIZE; 597 } 598 599 static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list, 600 struct sk_buff *skb, 601 struct netlink_callback *cb) 602 { 603 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 604 struct smc_ib_device *smcibdev; 605 int snum = cb_ctx->pos[0]; 606 int num = 0; 607 608 mutex_lock(&dev_list->mutex); 609 list_for_each_entry(smcibdev, &dev_list->list, list) { 610 if (num < snum) 611 goto next; 612 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb)) 613 goto errout; 614 next: 615 num++; 616 } 617 errout: 618 mutex_unlock(&dev_list->mutex); 619 cb_ctx->pos[0] = num; 620 } 621 622 int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb) 623 { 624 smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb); 625 return skb->len; 626 } 627 628 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) 629 { 630 struct smc_link *lnk = (struct smc_link *)priv; 631 struct smc_ib_device *smcibdev = lnk->smcibdev; 632 u8 port_idx; 633 634 switch (ibevent->event) { 635 case IB_EVENT_QP_FATAL: 636 case IB_EVENT_QP_ACCESS_ERR: 637 port_idx = ibevent->element.qp->port - 1; 638 if (port_idx >= SMC_MAX_PORTS) 639 break; 640 set_bit(port_idx, &smcibdev->port_event_mask); 641 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) 642 schedule_work(&smcibdev->port_event_work); 643 break; 644 default: 645 break; 646 } 647 } 648 649 void smc_ib_destroy_queue_pair(struct smc_link *lnk) 650 { 651 if (lnk->roce_qp) 652 ib_destroy_qp(lnk->roce_qp); 653 lnk->roce_qp = NULL; 654 } 655 656 /* create a queue pair within the protection domain for a link */ 657 int smc_ib_create_queue_pair(struct smc_link *lnk) 658 { 659 int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1; 660 struct ib_qp_init_attr qp_attr = { 661 .event_handler = smc_ib_qp_event_handler, 662 .qp_context = lnk, 663 .send_cq = lnk->smcibdev->roce_cq_send, 664 .recv_cq = lnk->smcibdev->roce_cq_recv, 665 .srq = NULL, 666 .cap = { 667 /* include unsolicited rdma_writes as well, 668 * there are max. 2 RDMA_WRITE per 1 WR_SEND 669 */ 670 .max_send_wr = SMC_WR_BUF_CNT * 3, 671 .max_recv_wr = SMC_WR_BUF_CNT * 3, 672 .max_send_sge = SMC_IB_MAX_SEND_SGE, 673 .max_recv_sge = sges_per_buf, 674 .max_inline_data = 0, 675 }, 676 .sq_sig_type = IB_SIGNAL_REQ_WR, 677 .qp_type = IB_QPT_RC, 678 }; 679 int rc; 680 681 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); 682 rc = PTR_ERR_OR_ZERO(lnk->roce_qp); 683 if (IS_ERR(lnk->roce_qp)) 684 lnk->roce_qp = NULL; 685 else 686 smc_wr_remember_qp_attr(lnk); 687 return rc; 688 } 689 690 void smc_ib_put_memory_region(struct ib_mr *mr) 691 { 692 ib_dereg_mr(mr); 693 } 694 695 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx) 696 { 697 unsigned int offset = 0; 698 int sg_num; 699 700 /* map the largest prefix of a dma mapped SG list */ 701 sg_num = ib_map_mr_sg(buf_slot->mr[link_idx], 702 buf_slot->sgt[link_idx].sgl, 703 buf_slot->sgt[link_idx].orig_nents, 704 &offset, PAGE_SIZE); 705 706 return sg_num; 707 } 708 709 /* Allocate a memory region and map the dma mapped SG list of buf_slot */ 710 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, 711 struct smc_buf_desc *buf_slot, u8 link_idx) 712 { 713 if (buf_slot->mr[link_idx]) 714 return 0; /* already done */ 715 716 buf_slot->mr[link_idx] = 717 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); 718 if (IS_ERR(buf_slot->mr[link_idx])) { 719 int rc; 720 721 rc = PTR_ERR(buf_slot->mr[link_idx]); 722 buf_slot->mr[link_idx] = NULL; 723 return rc; 724 } 725 726 if (smc_ib_map_mr_sg(buf_slot, link_idx) != 727 buf_slot->sgt[link_idx].orig_nents) 728 return -EINVAL; 729 730 return 0; 731 } 732 733 bool smc_ib_is_sg_need_sync(struct smc_link *lnk, 734 struct smc_buf_desc *buf_slot) 735 { 736 struct scatterlist *sg; 737 unsigned int i; 738 bool ret = false; 739 740 /* for now there is just one DMA address */ 741 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 742 buf_slot->sgt[lnk->link_idx].nents, i) { 743 if (!sg_dma_len(sg)) 744 break; 745 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device, 746 sg_dma_address(sg))) { 747 ret = true; 748 goto out; 749 } 750 } 751 752 out: 753 return ret; 754 } 755 756 /* synchronize buffer usage for cpu access */ 757 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk, 758 struct smc_buf_desc *buf_slot, 759 enum dma_data_direction data_direction) 760 { 761 struct scatterlist *sg; 762 unsigned int i; 763 764 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx))) 765 return; 766 767 /* for now there is just one DMA address */ 768 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 769 buf_slot->sgt[lnk->link_idx].nents, i) { 770 if (!sg_dma_len(sg)) 771 break; 772 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev, 773 sg_dma_address(sg), 774 sg_dma_len(sg), 775 data_direction); 776 } 777 } 778 779 /* synchronize buffer usage for device access */ 780 void smc_ib_sync_sg_for_device(struct smc_link *lnk, 781 struct smc_buf_desc *buf_slot, 782 enum dma_data_direction data_direction) 783 { 784 struct scatterlist *sg; 785 unsigned int i; 786 787 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx))) 788 return; 789 790 /* for now there is just one DMA address */ 791 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, 792 buf_slot->sgt[lnk->link_idx].nents, i) { 793 if (!sg_dma_len(sg)) 794 break; 795 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev, 796 sg_dma_address(sg), 797 sg_dma_len(sg), 798 data_direction); 799 } 800 } 801 802 /* Map a new TX or RX buffer SG-table to DMA */ 803 int smc_ib_buf_map_sg(struct smc_link *lnk, 804 struct smc_buf_desc *buf_slot, 805 enum dma_data_direction data_direction) 806 { 807 int mapped_nents; 808 809 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev, 810 buf_slot->sgt[lnk->link_idx].sgl, 811 buf_slot->sgt[lnk->link_idx].orig_nents, 812 data_direction); 813 if (!mapped_nents) 814 return -ENOMEM; 815 816 return mapped_nents; 817 } 818 819 void smc_ib_buf_unmap_sg(struct smc_link *lnk, 820 struct smc_buf_desc *buf_slot, 821 enum dma_data_direction data_direction) 822 { 823 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address) 824 return; /* already unmapped */ 825 826 ib_dma_unmap_sg(lnk->smcibdev->ibdev, 827 buf_slot->sgt[lnk->link_idx].sgl, 828 buf_slot->sgt[lnk->link_idx].orig_nents, 829 data_direction); 830 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0; 831 } 832 833 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) 834 { 835 struct ib_cq_init_attr cqattr = { 836 .cqe = SMC_MAX_CQE, .comp_vector = 0 }; 837 int cqe_size_order, smc_order; 838 long rc; 839 840 mutex_lock(&smcibdev->mutex); 841 rc = 0; 842 if (smcibdev->initialized) 843 goto out; 844 /* the calculated number of cq entries fits to mlx5 cq allocation */ 845 cqe_size_order = cache_line_size() == 128 ? 7 : 6; 846 smc_order = MAX_ORDER - cqe_size_order - 1; 847 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) 848 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; 849 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, 850 smc_wr_tx_cq_handler, NULL, 851 smcibdev, &cqattr); 852 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); 853 if (IS_ERR(smcibdev->roce_cq_send)) { 854 smcibdev->roce_cq_send = NULL; 855 goto out; 856 } 857 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, 858 smc_wr_rx_cq_handler, NULL, 859 smcibdev, &cqattr); 860 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); 861 if (IS_ERR(smcibdev->roce_cq_recv)) { 862 smcibdev->roce_cq_recv = NULL; 863 goto err; 864 } 865 smc_wr_add_dev(smcibdev); 866 smcibdev->initialized = 1; 867 goto out; 868 869 err: 870 ib_destroy_cq(smcibdev->roce_cq_send); 871 out: 872 mutex_unlock(&smcibdev->mutex); 873 return rc; 874 } 875 876 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) 877 { 878 mutex_lock(&smcibdev->mutex); 879 if (!smcibdev->initialized) 880 goto out; 881 smcibdev->initialized = 0; 882 ib_destroy_cq(smcibdev->roce_cq_recv); 883 ib_destroy_cq(smcibdev->roce_cq_send); 884 smc_wr_remove_dev(smcibdev); 885 out: 886 mutex_unlock(&smcibdev->mutex); 887 } 888 889 static struct ib_client smc_ib_client; 890 891 static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port) 892 { 893 struct ib_device *ibdev = smcibdev->ibdev; 894 struct net_device *ndev; 895 896 if (!ibdev->ops.get_netdev) 897 return; 898 ndev = ibdev->ops.get_netdev(ibdev, port + 1); 899 if (ndev) { 900 smcibdev->ndev_ifidx[port] = ndev->ifindex; 901 dev_put(ndev); 902 } 903 } 904 905 void smc_ib_ndev_change(struct net_device *ndev, unsigned long event) 906 { 907 struct smc_ib_device *smcibdev; 908 struct ib_device *libdev; 909 struct net_device *lndev; 910 u8 port_cnt; 911 int i; 912 913 mutex_lock(&smc_ib_devices.mutex); 914 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 915 port_cnt = smcibdev->ibdev->phys_port_cnt; 916 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) { 917 libdev = smcibdev->ibdev; 918 if (!libdev->ops.get_netdev) 919 continue; 920 lndev = libdev->ops.get_netdev(libdev, i + 1); 921 dev_put(lndev); 922 if (lndev != ndev) 923 continue; 924 if (event == NETDEV_REGISTER) 925 smcibdev->ndev_ifidx[i] = ndev->ifindex; 926 if (event == NETDEV_UNREGISTER) 927 smcibdev->ndev_ifidx[i] = 0; 928 } 929 } 930 mutex_unlock(&smc_ib_devices.mutex); 931 } 932 933 /* callback function for ib_register_client() */ 934 static int smc_ib_add_dev(struct ib_device *ibdev) 935 { 936 struct smc_ib_device *smcibdev; 937 u8 port_cnt; 938 int i; 939 940 if (ibdev->node_type != RDMA_NODE_IB_CA) 941 return -EOPNOTSUPP; 942 943 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); 944 if (!smcibdev) 945 return -ENOMEM; 946 947 smcibdev->ibdev = ibdev; 948 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); 949 atomic_set(&smcibdev->lnk_cnt, 0); 950 init_waitqueue_head(&smcibdev->lnks_deleted); 951 mutex_init(&smcibdev->mutex); 952 mutex_lock(&smc_ib_devices.mutex); 953 list_add_tail(&smcibdev->list, &smc_ib_devices.list); 954 mutex_unlock(&smc_ib_devices.mutex); 955 ib_set_client_data(ibdev, &smc_ib_client, smcibdev); 956 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, 957 smc_ib_global_event_handler); 958 ib_register_event_handler(&smcibdev->event_handler); 959 960 /* trigger reading of the port attributes */ 961 port_cnt = smcibdev->ibdev->phys_port_cnt; 962 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n", 963 smcibdev->ibdev->name, port_cnt); 964 for (i = 0; 965 i < min_t(size_t, port_cnt, SMC_MAX_PORTS); 966 i++) { 967 set_bit(i, &smcibdev->port_event_mask); 968 /* determine pnetids of the port */ 969 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i, 970 smcibdev->pnetid[i])) 971 smc_pnetid_by_table_ib(smcibdev, i + 1); 972 smc_copy_netdev_ifindex(smcibdev, i); 973 pr_warn_ratelimited("smc: ib device %s port %d has pnetid " 974 "%.16s%s\n", 975 smcibdev->ibdev->name, i + 1, 976 smcibdev->pnetid[i], 977 smcibdev->pnetid_by_user[i] ? 978 " (user defined)" : 979 ""); 980 } 981 schedule_work(&smcibdev->port_event_work); 982 return 0; 983 } 984 985 /* callback function for ib_unregister_client() */ 986 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) 987 { 988 struct smc_ib_device *smcibdev = client_data; 989 990 mutex_lock(&smc_ib_devices.mutex); 991 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ 992 mutex_unlock(&smc_ib_devices.mutex); 993 pr_warn_ratelimited("smc: removing ib device %s\n", 994 smcibdev->ibdev->name); 995 smc_smcr_terminate_all(smcibdev); 996 smc_ib_cleanup_per_ibdev(smcibdev); 997 ib_unregister_event_handler(&smcibdev->event_handler); 998 cancel_work_sync(&smcibdev->port_event_work); 999 kfree(smcibdev); 1000 } 1001 1002 static struct ib_client smc_ib_client = { 1003 .name = "smc_ib", 1004 .add = smc_ib_add_dev, 1005 .remove = smc_ib_remove_dev, 1006 }; 1007 1008 int __init smc_ib_register_client(void) 1009 { 1010 smc_ib_init_local_systemid(); 1011 return ib_register_client(&smc_ib_client); 1012 } 1013 1014 void smc_ib_unregister_client(void) 1015 { 1016 ib_unregister_client(&smc_ib_client); 1017 } 1018