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_rt;
 213         neigh = dst_neigh_lookup(&rt->dst, &fl4.daddr);
 214         if (!neigh)
 215                 goto out_rt;
 216         memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
 217         *uses_gateway = rt->rt_uses_gateway;
 218         neigh_release(neigh);
 219         ip_rt_put(rt);
 220         return 0;
 221
 222 out_rt:
 223         ip_rt_put(rt);
 224 out:
 225         return -ENOENT;
 226 }
 227
 228 static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
 229                                     const struct ib_gid_attr *attr,
 230                                     u8 gid[], u8 *sgid_index,
 231                                     struct smc_init_info_smcrv2 *smcrv2)
 232 {
 233         if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
 234                 if (gid)
 235                         memcpy(gid, &attr->gid, SMC_GID_SIZE);
 236                 if (sgid_index)
 237                         *sgid_index = attr->index;
 238                 return 0;
 239         }
 240         if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
 241             smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
 242                 struct in_device *in_dev = __in_dev_get_rcu(ndev);
 243                 struct net *net = dev_net(ndev);
 244                 const struct in_ifaddr *ifa;
 245                 bool subnet_match = false;
 246
 247                 if (!in_dev)
 248                         goto out;
 249                 in_dev_for_each_ifa_rcu(ifa, in_dev) {
 250                         if (!inet_ifa_match(smcrv2->saddr, ifa))
 251                                 continue;
 252                         subnet_match = true;
 253                         break;
 254                 }
 255                 if (!subnet_match)
 256                         goto out;
 257                 if (smcrv2->daddr && smc_ib_find_route(net, smcrv2->saddr,
 258                                                        smcrv2->daddr,
 259                                                        smcrv2->nexthop_mac,
 260                                                        &smcrv2->uses_gateway))
 261                         goto out;
 262
 263                 if (gid)
 264                         memcpy(gid, &attr->gid, SMC_GID_SIZE);
 265                 if (sgid_index)
 266                         *sgid_index = attr->index;
 267                 return 0;
 268         }
 269 out:
 270         return -ENODEV;
 271 }
 272
 273 /* determine the gid for an ib-device port and vlan id */
 274 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
 275                          unsigned short vlan_id, u8 gid[], u8 *sgid_index,
 276                          struct smc_init_info_smcrv2 *smcrv2)
 277 {
 278         const struct ib_gid_attr *attr;
 279         const struct net_device *ndev;
 280         int i;
 281
 282         for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
 283                 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
 284                 if (IS_ERR(attr))
 285                         continue;
 286
 287                 rcu_read_lock();
 288                 ndev = rdma_read_gid_attr_ndev_rcu(attr);
 289                 if (!IS_ERR(ndev) &&
 290                     ((!vlan_id && !is_vlan_dev(ndev)) ||
 291                      (vlan_id && is_vlan_dev(ndev) &&
 292                       vlan_dev_vlan_id(ndev) == vlan_id))) {
 293                         if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
 294                                                       sgid_index, smcrv2)) {
 295                                 rcu_read_unlock();
 296                                 rdma_put_gid_attr(attr);
 297                                 return 0;
 298                         }
 299                 }
 300                 rcu_read_unlock();
 301                 rdma_put_gid_attr(attr);
 302         }
 303         return -ENODEV;
 304 }
 305
 306 /* check if gid is still defined on smcibdev */
 307 static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
 308                                   struct smc_ib_device *smcibdev, u8 ibport)
 309 {
 310         const struct ib_gid_attr *attr;
 311         bool rc = false;
 312         int i;
 313
 314         for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
 315                 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
 316                 if (IS_ERR(attr))
 317                         continue;
 318
 319                 rcu_read_lock();
 320                 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
 321                     (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
 322                      !(ipv6_addr_type((const struct in6_addr *)&attr->gid)
 323                                      & IPV6_ADDR_LINKLOCAL)))
 324                         if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
 325                                 rc = true;
 326                 rcu_read_unlock();
 327                 rdma_put_gid_attr(attr);
 328         }
 329         return rc;
 330 }
 331
 332 /* check all links if the gid is still defined on smcibdev */
 333 static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
 334 {
 335         struct smc_link_group *lgr;
 336         int i;
 337
 338         spin_lock_bh(&smc_lgr_list.lock);
 339         list_for_each_entry(lgr, &smc_lgr_list.list, list) {
 340                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
 341                             SMC_MAX_PNETID_LEN))
 342                         continue; /* lgr is not affected */
 343                 if (list_empty(&lgr->list))
 344                         continue;
 345                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 346                         if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
 347                             lgr->lnk[i].smcibdev != smcibdev)
 348                                 continue;
 349                         if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
 350                                                    lgr->smc_version == SMC_V2,
 351                                                    smcibdev, ibport))
 352                                 smcr_port_err(smcibdev, ibport);
 353                 }
 354         }
 355         spin_unlock_bh(&smc_lgr_list.lock);
 356 }
 357
 358 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
 359 {
 360         int rc;
 361
 362         memset(&smcibdev->pattr[ibport - 1], 0,
 363                sizeof(smcibdev->pattr[ibport - 1]));
 364         rc = ib_query_port(smcibdev->ibdev, ibport,
 365                            &smcibdev->pattr[ibport - 1]);
 366         if (rc)
 367                 goto out;
 368         /* the SMC protocol requires specification of the RoCE MAC address */
 369         rc = smc_ib_fill_mac(smcibdev, ibport);
 370         if (rc)
 371                 goto out;
 372         if (!smc_ib_is_valid_local_systemid() &&
 373             smc_ib_port_active(smcibdev, ibport))
 374                 /* create unique system identifier */
 375                 smc_ib_define_local_systemid(smcibdev, ibport);
 376 out:
 377         return rc;
 378 }
 379
 380 /* process context wrapper for might_sleep smc_ib_remember_port_attr */
 381 static void smc_ib_port_event_work(struct work_struct *work)
 382 {
 383         struct smc_ib_device *smcibdev = container_of(
 384                 work, struct smc_ib_device, port_event_work);
 385         u8 port_idx;
 386
 387         for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
 388                 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
 389                 clear_bit(port_idx, &smcibdev->port_event_mask);
 390                 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
 391                         set_bit(port_idx, smcibdev->ports_going_away);
 392                         smcr_port_err(smcibdev, port_idx + 1);
 393                 } else {
 394                         clear_bit(port_idx, smcibdev->ports_going_away);
 395                         smcr_port_add(smcibdev, port_idx + 1);
 396                         smc_ib_gid_check(smcibdev, port_idx + 1);
 397                 }
 398         }
 399 }
 400
 401 /* can be called in IRQ context */
 402 static void smc_ib_global_event_handler(struct ib_event_handler *handler,
 403                                         struct ib_event *ibevent)
 404 {
 405         struct smc_ib_device *smcibdev;
 406         bool schedule = false;
 407         u8 port_idx;
 408
 409         smcibdev = container_of(handler, struct smc_ib_device, event_handler);
 410
 411         switch (ibevent->event) {
 412         case IB_EVENT_DEVICE_FATAL:
 413                 /* terminate all ports on device */
 414                 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
 415                         set_bit(port_idx, &smcibdev->port_event_mask);
 416                         if (!test_and_set_bit(port_idx,
 417                                               smcibdev->ports_going_away))
 418                                 schedule = true;
 419                 }
 420                 if (schedule)
 421                         schedule_work(&smcibdev->port_event_work);
 422                 break;
 423         case IB_EVENT_PORT_ACTIVE:
 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_clear_bit(port_idx, smcibdev->ports_going_away))
 429                         schedule_work(&smcibdev->port_event_work);
 430                 break;
 431         case IB_EVENT_PORT_ERR:
 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                 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
 437                         schedule_work(&smcibdev->port_event_work);
 438                 break;
 439         case IB_EVENT_GID_CHANGE:
 440                 port_idx = ibevent->element.port_num - 1;
 441                 if (port_idx >= SMC_MAX_PORTS)
 442                         break;
 443                 set_bit(port_idx, &smcibdev->port_event_mask);
 444                 schedule_work(&smcibdev->port_event_work);
 445                 break;
 446         default:
 447                 break;
 448         }
 449 }
 450
 451 void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
 452 {
 453         if (lnk->roce_pd)
 454                 ib_dealloc_pd(lnk->roce_pd);
 455         lnk->roce_pd = NULL;
 456 }
 457
 458 int smc_ib_create_protection_domain(struct smc_link *lnk)
 459 {
 460         int rc;
 461
 462         lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
 463         rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
 464         if (IS_ERR(lnk->roce_pd))
 465                 lnk->roce_pd = NULL;
 466         return rc;
 467 }
 468
 469 static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
 470                                       struct smc_ib_device *smcibdev)
 471 {
 472         struct smc_link_group *lgr;
 473         bool rc = false;
 474         int i;
 475
 476         spin_lock_bh(&smc_lgr->lock);
 477         list_for_each_entry(lgr, &smc_lgr->list, list) {
 478                 if (lgr->is_smcd)
 479                         continue;
 480                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 481                         if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
 482                             lgr->lnk[i].smcibdev != smcibdev)
 483                                 continue;
 484                         if (lgr->type == SMC_LGR_SINGLE ||
 485                             lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
 486                                 rc = true;
 487                                 goto out;
 488                         }
 489                 }
 490         }
 491 out:
 492         spin_unlock_bh(&smc_lgr->lock);
 493         return rc;
 494 }
 495
 496 static int smc_nl_handle_dev_port(struct sk_buff *skb,
 497                                   struct ib_device *ibdev,
 498                                   struct smc_ib_device *smcibdev,
 499                                   int port)
 500 {
 501         char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 502         struct nlattr *port_attrs;
 503         unsigned char port_state;
 504         int lnk_count = 0;
 505
 506         port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
 507         if (!port_attrs)
 508                 goto errout;
 509
 510         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
 511                        smcibdev->pnetid_by_user[port]))
 512                 goto errattr;
 513         memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
 514         smc_pnet[SMC_MAX_PNETID_LEN] = 0;
 515         if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
 516                 goto errattr;
 517         if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
 518                         smcibdev->ndev_ifidx[port]))
 519                 goto errattr;
 520         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
 521                 goto errattr;
 522         port_state = smc_ib_port_active(smcibdev, port + 1);
 523         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
 524                 goto errattr;
 525         lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
 526         if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
 527                 goto errattr;
 528         nla_nest_end(skb, port_attrs);
 529         return 0;
 530 errattr:
 531         nla_nest_cancel(skb, port_attrs);
 532 errout:
 533         return -EMSGSIZE;
 534 }
 535
 536 static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
 537                                      struct sk_buff *skb)
 538 {
 539         if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
 540                 return false;
 541         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
 542                 return false;
 543         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
 544                 return false;
 545         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
 546                 return false;
 547         if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
 548                 return false;
 549         return true;
 550 }
 551
 552 static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
 553                                   struct sk_buff *skb,
 554                                   struct netlink_callback *cb)
 555 {
 556         char smc_ibname[IB_DEVICE_NAME_MAX];
 557         struct smc_pci_dev smc_pci_dev;
 558         struct pci_dev *pci_dev;
 559         unsigned char is_crit;
 560         struct nlattr *attrs;
 561         void *nlh;
 562         int i;
 563
 564         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 565                           &smc_gen_nl_family, NLM_F_MULTI,
 566                           SMC_NETLINK_GET_DEV_SMCR);
 567         if (!nlh)
 568                 goto errmsg;
 569         attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
 570         if (!attrs)
 571                 goto errout;
 572         is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
 573         if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
 574                 goto errattr;
 575         if (smcibdev->ibdev->dev.parent) {
 576                 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
 577                 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
 578                 smc_set_pci_values(pci_dev, &smc_pci_dev);
 579                 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
 580                         goto errattr;
 581         }
 582         snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
 583         if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
 584                 goto errattr;
 585         for (i = 1; i <= SMC_MAX_PORTS; i++) {
 586                 if (!rdma_is_port_valid(smcibdev->ibdev, i))
 587                         continue;
 588                 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
 589                                            smcibdev, i - 1))
 590                         goto errattr;
 591         }
 592
 593         nla_nest_end(skb, attrs);
 594         genlmsg_end(skb, nlh);
 595         return 0;
 596
 597 errattr:
 598         nla_nest_cancel(skb, attrs);
 599 errout:
 600         genlmsg_cancel(skb, nlh);
 601 errmsg:
 602         return -EMSGSIZE;
 603 }
 604
 605 static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
 606                                  struct sk_buff *skb,
 607                                  struct netlink_callback *cb)
 608 {
 609         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 610         struct smc_ib_device *smcibdev;
 611         int snum = cb_ctx->pos[0];
 612         int num = 0;
 613
 614         mutex_lock(&dev_list->mutex);
 615         list_for_each_entry(smcibdev, &dev_list->list, list) {
 616                 if (num < snum)
 617                         goto next;
 618                 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
 619                         goto errout;
 620 next:
 621                 num++;
 622         }
 623 errout:
 624         mutex_unlock(&dev_list->mutex);
 625         cb_ctx->pos[0] = num;
 626 }
 627
 628 int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
 629 {
 630         smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
 631         return skb->len;
 632 }
 633
 634 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
 635 {
 636         struct smc_link *lnk = (struct smc_link *)priv;
 637         struct smc_ib_device *smcibdev = lnk->smcibdev;
 638         u8 port_idx;
 639
 640         switch (ibevent->event) {
 641         case IB_EVENT_QP_FATAL:
 642         case IB_EVENT_QP_ACCESS_ERR:
 643                 port_idx = ibevent->element.qp->port - 1;
 644                 if (port_idx >= SMC_MAX_PORTS)
 645                         break;
 646                 set_bit(port_idx, &smcibdev->port_event_mask);
 647                 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
 648                         schedule_work(&smcibdev->port_event_work);
 649                 break;
 650         default:
 651                 break;
 652         }
 653 }
 654
 655 void smc_ib_destroy_queue_pair(struct smc_link *lnk)
 656 {
 657         if (lnk->roce_qp)
 658                 ib_destroy_qp(lnk->roce_qp);
 659         lnk->roce_qp = NULL;
 660 }
 661
 662 /* create a queue pair within the protection domain for a link */
 663 int smc_ib_create_queue_pair(struct smc_link *lnk)
 664 {
 665         int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
 666         struct ib_qp_init_attr qp_attr = {
 667                 .event_handler = smc_ib_qp_event_handler,
 668                 .qp_context = lnk,
 669                 .send_cq = lnk->smcibdev->roce_cq_send,
 670                 .recv_cq = lnk->smcibdev->roce_cq_recv,
 671                 .srq = NULL,
 672                 .cap = {
 673                                 /* include unsolicited rdma_writes as well,
 674                                  * there are max. 2 RDMA_WRITE per 1 WR_SEND
 675                                  */
 676                         .max_send_wr = SMC_WR_BUF_CNT * 3,
 677                         .max_recv_wr = SMC_WR_BUF_CNT * 3,
 678                         .max_send_sge = SMC_IB_MAX_SEND_SGE,
 679                         .max_recv_sge = sges_per_buf,
 680                         .max_inline_data = 0,
 681                 },
 682                 .sq_sig_type = IB_SIGNAL_REQ_WR,
 683                 .qp_type = IB_QPT_RC,
 684         };
 685         int rc;
 686
 687         lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
 688         rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
 689         if (IS_ERR(lnk->roce_qp))
 690                 lnk->roce_qp = NULL;
 691         else
 692                 smc_wr_remember_qp_attr(lnk);
 693         return rc;
 694 }
 695
 696 void smc_ib_put_memory_region(struct ib_mr *mr)
 697 {
 698         ib_dereg_mr(mr);
 699 }
 700
 701 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
 702 {
 703         unsigned int offset = 0;
 704         int sg_num;
 705
 706         /* map the largest prefix of a dma mapped SG list */
 707         sg_num = ib_map_mr_sg(buf_slot->mr[link_idx],
 708                               buf_slot->sgt[link_idx].sgl,
 709                               buf_slot->sgt[link_idx].orig_nents,
 710                               &offset, PAGE_SIZE);
 711
 712         return sg_num;
 713 }
 714
 715 /* Allocate a memory region and map the dma mapped SG list of buf_slot */
 716 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
 717                              struct smc_buf_desc *buf_slot, u8 link_idx)
 718 {
 719         if (buf_slot->mr[link_idx])
 720                 return 0; /* already done */
 721
 722         buf_slot->mr[link_idx] =
 723                 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
 724         if (IS_ERR(buf_slot->mr[link_idx])) {
 725                 int rc;
 726
 727                 rc = PTR_ERR(buf_slot->mr[link_idx]);
 728                 buf_slot->mr[link_idx] = NULL;
 729                 return rc;
 730         }
 731
 732         if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
 733                              buf_slot->sgt[link_idx].orig_nents)
 734                 return -EINVAL;
 735
 736         return 0;
 737 }
 738
 739 bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
 740                             struct smc_buf_desc *buf_slot)
 741 {
 742         struct scatterlist *sg;
 743         unsigned int i;
 744         bool ret = false;
 745
 746         /* for now there is just one DMA address */
 747         for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
 748                     buf_slot->sgt[lnk->link_idx].nents, i) {
 749                 if (!sg_dma_len(sg))
 750                         break;
 751                 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device,
 752                                   sg_dma_address(sg))) {
 753                         ret = true;
 754                         goto out;
 755                 }
 756         }
 757
 758 out:
 759         return ret;
 760 }
 761
 762 /* synchronize buffer usage for cpu access */
 763 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
 764                             struct smc_buf_desc *buf_slot,
 765                             enum dma_data_direction data_direction)
 766 {
 767         struct scatterlist *sg;
 768         unsigned int i;
 769
 770         if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
 771                 return;
 772
 773         /* for now there is just one DMA address */
 774         for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
 775                     buf_slot->sgt[lnk->link_idx].nents, i) {
 776                 if (!sg_dma_len(sg))
 777                         break;
 778                 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
 779                                            sg_dma_address(sg),
 780                                            sg_dma_len(sg),
 781                                            data_direction);
 782         }
 783 }
 784
 785 /* synchronize buffer usage for device access */
 786 void smc_ib_sync_sg_for_device(struct smc_link *lnk,
 787                                struct smc_buf_desc *buf_slot,
 788                                enum dma_data_direction data_direction)
 789 {
 790         struct scatterlist *sg;
 791         unsigned int i;
 792
 793         if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
 794                 return;
 795
 796         /* for now there is just one DMA address */
 797         for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
 798                     buf_slot->sgt[lnk->link_idx].nents, i) {
 799                 if (!sg_dma_len(sg))
 800                         break;
 801                 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
 802                                               sg_dma_address(sg),
 803                                               sg_dma_len(sg),
 804                                               data_direction);
 805         }
 806 }
 807
 808 /* Map a new TX or RX buffer SG-table to DMA */
 809 int smc_ib_buf_map_sg(struct smc_link *lnk,
 810                       struct smc_buf_desc *buf_slot,
 811                       enum dma_data_direction data_direction)
 812 {
 813         int mapped_nents;
 814
 815         mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
 816                                      buf_slot->sgt[lnk->link_idx].sgl,
 817                                      buf_slot->sgt[lnk->link_idx].orig_nents,
 818                                      data_direction);
 819         if (!mapped_nents)
 820                 return -ENOMEM;
 821
 822         return mapped_nents;
 823 }
 824
 825 void smc_ib_buf_unmap_sg(struct smc_link *lnk,
 826                          struct smc_buf_desc *buf_slot,
 827                          enum dma_data_direction data_direction)
 828 {
 829         if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
 830                 return; /* already unmapped */
 831
 832         ib_dma_unmap_sg(lnk->smcibdev->ibdev,
 833                         buf_slot->sgt[lnk->link_idx].sgl,
 834                         buf_slot->sgt[lnk->link_idx].orig_nents,
 835                         data_direction);
 836         buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
 837 }
 838
 839 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
 840 {
 841         struct ib_cq_init_attr cqattr = {
 842                 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
 843         int cqe_size_order, smc_order;
 844         long rc;
 845
 846         mutex_lock(&smcibdev->mutex);
 847         rc = 0;
 848         if (smcibdev->initialized)
 849                 goto out;
 850         /* the calculated number of cq entries fits to mlx5 cq allocation */
 851         cqe_size_order = cache_line_size() == 128 ? 7 : 6;
 852         smc_order = MAX_PAGE_ORDER - cqe_size_order;
 853         if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
 854                 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
 855         smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
 856                                               smc_wr_tx_cq_handler, NULL,
 857                                               smcibdev, &cqattr);
 858         rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
 859         if (IS_ERR(smcibdev->roce_cq_send)) {
 860                 smcibdev->roce_cq_send = NULL;
 861                 goto out;
 862         }
 863         smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
 864                                               smc_wr_rx_cq_handler, NULL,
 865                                               smcibdev, &cqattr);
 866         rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
 867         if (IS_ERR(smcibdev->roce_cq_recv)) {
 868                 smcibdev->roce_cq_recv = NULL;
 869                 goto err;
 870         }
 871         smc_wr_add_dev(smcibdev);
 872         smcibdev->initialized = 1;
 873         goto out;
 874
 875 err:
 876         ib_destroy_cq(smcibdev->roce_cq_send);
 877 out:
 878         mutex_unlock(&smcibdev->mutex);
 879         return rc;
 880 }
 881
 882 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
 883 {
 884         mutex_lock(&smcibdev->mutex);
 885         if (!smcibdev->initialized)
 886                 goto out;
 887         smcibdev->initialized = 0;
 888         ib_destroy_cq(smcibdev->roce_cq_recv);
 889         ib_destroy_cq(smcibdev->roce_cq_send);
 890         smc_wr_remove_dev(smcibdev);
 891 out:
 892         mutex_unlock(&smcibdev->mutex);
 893 }
 894
 895 static struct ib_client smc_ib_client;
 896
 897 static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
 898 {
 899         struct ib_device *ibdev = smcibdev->ibdev;
 900         struct net_device *ndev;
 901
 902         if (!ibdev->ops.get_netdev)
 903                 return;
 904         ndev = ibdev->ops.get_netdev(ibdev, port + 1);
 905         if (ndev) {
 906                 smcibdev->ndev_ifidx[port] = ndev->ifindex;
 907                 dev_put(ndev);
 908         }
 909 }
 910
 911 void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
 912 {
 913         struct smc_ib_device *smcibdev;
 914         struct ib_device *libdev;
 915         struct net_device *lndev;
 916         u8 port_cnt;
 917         int i;
 918
 919         mutex_lock(&smc_ib_devices.mutex);
 920         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
 921                 port_cnt = smcibdev->ibdev->phys_port_cnt;
 922                 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
 923                         libdev = smcibdev->ibdev;
 924                         if (!libdev->ops.get_netdev)
 925                                 continue;
 926                         lndev = libdev->ops.get_netdev(libdev, i + 1);
 927                         dev_put(lndev);
 928                         if (lndev != ndev)
 929                                 continue;
 930                         if (event == NETDEV_REGISTER)
 931                                 smcibdev->ndev_ifidx[i] = ndev->ifindex;
 932                         if (event == NETDEV_UNREGISTER)
 933                                 smcibdev->ndev_ifidx[i] = 0;
 934                 }
 935         }
 936         mutex_unlock(&smc_ib_devices.mutex);
 937 }
 938
 939 /* callback function for ib_register_client() */
 940 static int smc_ib_add_dev(struct ib_device *ibdev)
 941 {
 942         struct smc_ib_device *smcibdev;
 943         u8 port_cnt;
 944         int i;
 945
 946         if (ibdev->node_type != RDMA_NODE_IB_CA)
 947                 return -EOPNOTSUPP;
 948
 949         smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
 950         if (!smcibdev)
 951                 return -ENOMEM;
 952
 953         smcibdev->ibdev = ibdev;
 954         INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
 955         atomic_set(&smcibdev->lnk_cnt, 0);
 956         init_waitqueue_head(&smcibdev->lnks_deleted);
 957         mutex_init(&smcibdev->mutex);
 958         mutex_lock(&smc_ib_devices.mutex);
 959         list_add_tail(&smcibdev->list, &smc_ib_devices.list);
 960         mutex_unlock(&smc_ib_devices.mutex);
 961         ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
 962         INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
 963                               smc_ib_global_event_handler);
 964         ib_register_event_handler(&smcibdev->event_handler);
 965
 966         /* trigger reading of the port attributes */
 967         port_cnt = smcibdev->ibdev->phys_port_cnt;
 968         pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
 969                             smcibdev->ibdev->name, port_cnt);
 970         for (i = 0;
 971              i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
 972              i++) {
 973                 set_bit(i, &smcibdev->port_event_mask);
 974                 /* determine pnetids of the port */
 975                 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
 976                                            smcibdev->pnetid[i]))
 977                         smc_pnetid_by_table_ib(smcibdev, i + 1);
 978                 smc_copy_netdev_ifindex(smcibdev, i);
 979                 pr_warn_ratelimited("smc:    ib device %s port %d has pnetid "
 980                                     "%.16s%s\n",
 981                                     smcibdev->ibdev->name, i + 1,
 982                                     smcibdev->pnetid[i],
 983                                     smcibdev->pnetid_by_user[i] ?
 984                                      " (user defined)" :
 985                                      "");
 986         }
 987         schedule_work(&smcibdev->port_event_work);
 988         return 0;
 989 }
 990
 991 /* callback function for ib_unregister_client() */
 992 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
 993 {
 994         struct smc_ib_device *smcibdev = client_data;
 995
 996         mutex_lock(&smc_ib_devices.mutex);
 997         list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
 998         mutex_unlock(&smc_ib_devices.mutex);
 999         pr_warn_ratelimited("smc: removing ib device %s\n",
1000                             smcibdev->ibdev->name);
1001         smc_smcr_terminate_all(smcibdev);
1002         smc_ib_cleanup_per_ibdev(smcibdev);
1003         ib_unregister_event_handler(&smcibdev->event_handler);
1004         cancel_work_sync(&smcibdev->port_event_work);
1005         kfree(smcibdev);
1006 }
1007
1008 static struct ib_client smc_ib_client = {
1009         .name   = "smc_ib",
1010         .add    = smc_ib_add_dev,
1011         .remove = smc_ib_remove_dev,
1012 };
1013
1014 int __init smc_ib_register_client(void)
1015 {
1016         smc_ib_init_local_systemid();
1017         return ib_register_client(&smc_ib_client);
1018 }
1019
1020 void smc_ib_unregister_client(void)
1021 {
1022         ib_unregister_client(&smc_ib_client);
1023 }