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