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 <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_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 }