net/smc/smc_ib.c

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