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(__be32 saddr, __be32 daddr,
 197                       u8 nexthop_mac[], u8 *uses_gateway)
 198 {
 199         struct neighbour *neigh = NULL;
 200         struct rtable *rt = NULL;
 201         struct flowi4 fl4 = {
 202                 .saddr = saddr,
 203                 .daddr = daddr
 204         };
 205
 206         if (daddr == cpu_to_be32(INADDR_NONE))
 207                 goto out;
 208         rt = ip_route_output_flow(&init_net, &fl4, NULL);
 209         if (IS_ERR(rt))
 210                 goto out;
 211         if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
 212                 goto out;
 213         neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
 214         if (neigh) {
 215                 memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
 216                 *uses_gateway = rt->rt_uses_gateway;
 217                 return 0;
 218         }
 219 out:
 220         return -ENOENT;
 221 }
 222
 223 static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
 224                                     const struct ib_gid_attr *attr,
 225                                     u8 gid[], u8 *sgid_index,
 226                                     struct smc_init_info_smcrv2 *smcrv2)
 227 {
 228         if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
 229                 if (gid)
 230                         memcpy(gid, &attr->gid, SMC_GID_SIZE);
 231                 if (sgid_index)
 232                         *sgid_index = attr->index;
 233                 return 0;
 234         }
 235         if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
 236             smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
 237                 struct in_device *in_dev = __in_dev_get_rcu(ndev);
 238                 const struct in_ifaddr *ifa;
 239                 bool subnet_match = false;
 240
 241                 if (!in_dev)
 242                         goto out;
 243                 in_dev_for_each_ifa_rcu(ifa, in_dev) {
 244                         if (!inet_ifa_match(smcrv2->saddr, ifa))
 245                                 continue;
 246                         subnet_match = true;
 247                         break;
 248                 }
 249                 if (!subnet_match)
 250                         goto out;
 251                 if (smcrv2->daddr && smc_ib_find_route(smcrv2->saddr,
 252                                                        smcrv2->daddr,
 253                                                        smcrv2->nexthop_mac,
 254                                                        &smcrv2->uses_gateway))
 255                         goto out;
 256
 257                 if (gid)
 258                         memcpy(gid, &attr->gid, SMC_GID_SIZE);
 259                 if (sgid_index)
 260                         *sgid_index = attr->index;
 261                 return 0;
 262         }
 263 out:
 264         return -ENODEV;
 265 }
 266
 267 /* determine the gid for an ib-device port and vlan id */
 268 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
 269                          unsigned short vlan_id, u8 gid[], u8 *sgid_index,
 270                          struct smc_init_info_smcrv2 *smcrv2)
 271 {
 272         const struct ib_gid_attr *attr;
 273         const struct net_device *ndev;
 274         int i;
 275
 276         for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
 277                 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
 278                 if (IS_ERR(attr))
 279                         continue;
 280
 281                 rcu_read_lock();
 282                 ndev = rdma_read_gid_attr_ndev_rcu(attr);
 283                 if (!IS_ERR(ndev) &&
 284                     ((!vlan_id && !is_vlan_dev(ndev)) ||
 285                      (vlan_id && is_vlan_dev(ndev) &&
 286                       vlan_dev_vlan_id(ndev) == vlan_id))) {
 287                         if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
 288                                                       sgid_index, smcrv2)) {
 289                                 rcu_read_unlock();
 290                                 rdma_put_gid_attr(attr);
 291                                 return 0;
 292                         }
 293                 }
 294                 rcu_read_unlock();
 295                 rdma_put_gid_attr(attr);
 296         }
 297         return -ENODEV;
 298 }
 299
 300 /* check if gid is still defined on smcibdev */
 301 static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
 302                                   struct smc_ib_device *smcibdev, u8 ibport)
 303 {
 304         const struct ib_gid_attr *attr;
 305         bool rc = false;
 306         int i;
 307
 308         for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
 309                 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
 310                 if (IS_ERR(attr))
 311                         continue;
 312
 313                 rcu_read_lock();
 314                 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
 315                     (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
 316                      !(ipv6_addr_type((const struct in6_addr *)&attr->gid)
 317                                      & IPV6_ADDR_LINKLOCAL)))
 318                         if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
 319                                 rc = true;
 320                 rcu_read_unlock();
 321                 rdma_put_gid_attr(attr);
 322         }
 323         return rc;
 324 }
 325
 326 /* check all links if the gid is still defined on smcibdev */
 327 static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
 328 {
 329         struct smc_link_group *lgr;
 330         int i;
 331
 332         spin_lock_bh(&smc_lgr_list.lock);
 333         list_for_each_entry(lgr, &smc_lgr_list.list, list) {
 334                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
 335                             SMC_MAX_PNETID_LEN))
 336                         continue; /* lgr is not affected */
 337                 if (list_empty(&lgr->list))
 338                         continue;
 339                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 340                         if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
 341                             lgr->lnk[i].smcibdev != smcibdev)
 342                                 continue;
 343                         if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
 344                                                    lgr->smc_version == SMC_V2,
 345                                                    smcibdev, ibport))
 346                                 smcr_port_err(smcibdev, ibport);
 347                 }
 348         }
 349         spin_unlock_bh(&smc_lgr_list.lock);
 350 }
 351
 352 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
 353 {
 354         int rc;
 355
 356         memset(&smcibdev->pattr[ibport - 1], 0,
 357                sizeof(smcibdev->pattr[ibport - 1]));
 358         rc = ib_query_port(smcibdev->ibdev, ibport,
 359                            &smcibdev->pattr[ibport - 1]);
 360         if (rc)
 361                 goto out;
 362         /* the SMC protocol requires specification of the RoCE MAC address */
 363         rc = smc_ib_fill_mac(smcibdev, ibport);
 364         if (rc)
 365                 goto out;
 366         if (!smc_ib_is_valid_local_systemid() &&
 367             smc_ib_port_active(smcibdev, ibport))
 368                 /* create unique system identifier */
 369                 smc_ib_define_local_systemid(smcibdev, ibport);
 370 out:
 371         return rc;
 372 }
 373
 374 /* process context wrapper for might_sleep smc_ib_remember_port_attr */
 375 static void smc_ib_port_event_work(struct work_struct *work)
 376 {
 377         struct smc_ib_device *smcibdev = container_of(
 378                 work, struct smc_ib_device, port_event_work);
 379         u8 port_idx;
 380
 381         for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
 382                 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
 383                 clear_bit(port_idx, &smcibdev->port_event_mask);
 384                 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
 385                         set_bit(port_idx, smcibdev->ports_going_away);
 386                         smcr_port_err(smcibdev, port_idx + 1);
 387                 } else {
 388                         clear_bit(port_idx, smcibdev->ports_going_away);
 389                         smcr_port_add(smcibdev, port_idx + 1);
 390                         smc_ib_gid_check(smcibdev, port_idx + 1);
 391                 }
 392         }
 393 }
 394
 395 /* can be called in IRQ context */
 396 static void smc_ib_global_event_handler(struct ib_event_handler *handler,
 397                                         struct ib_event *ibevent)
 398 {
 399         struct smc_ib_device *smcibdev;
 400         bool schedule = false;
 401         u8 port_idx;
 402
 403         smcibdev = container_of(handler, struct smc_ib_device, event_handler);
 404
 405         switch (ibevent->event) {
 406         case IB_EVENT_DEVICE_FATAL:
 407                 /* terminate all ports on device */
 408                 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
 409                         set_bit(port_idx, &smcibdev->port_event_mask);
 410                         if (!test_and_set_bit(port_idx,
 411                                               smcibdev->ports_going_away))
 412                                 schedule = true;
 413                 }
 414                 if (schedule)
 415                         schedule_work(&smcibdev->port_event_work);
 416                 break;
 417         case IB_EVENT_PORT_ACTIVE:
 418                 port_idx = ibevent->element.port_num - 1;
 419                 if (port_idx >= SMC_MAX_PORTS)
 420                         break;
 421                 set_bit(port_idx, &smcibdev->port_event_mask);
 422                 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
 423                         schedule_work(&smcibdev->port_event_work);
 424                 break;
 425         case IB_EVENT_PORT_ERR:
 426                 port_idx = ibevent->element.port_num - 1;
 427                 if (port_idx >= SMC_MAX_PORTS)
 428                         break;
 429                 set_bit(port_idx, &smcibdev->port_event_mask);
 430                 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
 431                         schedule_work(&smcibdev->port_event_work);
 432                 break;
 433         case IB_EVENT_GID_CHANGE:
 434                 port_idx = ibevent->element.port_num - 1;
 435                 if (port_idx >= SMC_MAX_PORTS)
 436                         break;
 437                 set_bit(port_idx, &smcibdev->port_event_mask);
 438                 schedule_work(&smcibdev->port_event_work);
 439                 break;
 440         default:
 441                 break;
 442         }
 443 }
 444
 445 void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
 446 {
 447         if (lnk->roce_pd)
 448                 ib_dealloc_pd(lnk->roce_pd);
 449         lnk->roce_pd = NULL;
 450 }
 451
 452 int smc_ib_create_protection_domain(struct smc_link *lnk)
 453 {
 454         int rc;
 455
 456         lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
 457         rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
 458         if (IS_ERR(lnk->roce_pd))
 459                 lnk->roce_pd = NULL;
 460         return rc;
 461 }
 462
 463 static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
 464                                       struct smc_ib_device *smcibdev)
 465 {
 466         struct smc_link_group *lgr;
 467         bool rc = false;
 468         int i;
 469
 470         spin_lock_bh(&smc_lgr->lock);
 471         list_for_each_entry(lgr, &smc_lgr->list, list) {
 472                 if (lgr->is_smcd)
 473                         continue;
 474                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 475                         if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
 476                             lgr->lnk[i].smcibdev != smcibdev)
 477                                 continue;
 478                         if (lgr->type == SMC_LGR_SINGLE ||
 479                             lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
 480                                 rc = true;
 481                                 goto out;
 482                         }
 483                 }
 484         }
 485 out:
 486         spin_unlock_bh(&smc_lgr->lock);
 487         return rc;
 488 }
 489
 490 static int smc_nl_handle_dev_port(struct sk_buff *skb,
 491                                   struct ib_device *ibdev,
 492                                   struct smc_ib_device *smcibdev,
 493                                   int port)
 494 {
 495         char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 496         struct nlattr *port_attrs;
 497         unsigned char port_state;
 498         int lnk_count = 0;
 499
 500         port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
 501         if (!port_attrs)
 502                 goto errout;
 503
 504         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
 505                        smcibdev->pnetid_by_user[port]))
 506                 goto errattr;
 507         memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
 508         smc_pnet[SMC_MAX_PNETID_LEN] = 0;
 509         if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
 510                 goto errattr;
 511         if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
 512                         smcibdev->ndev_ifidx[port]))
 513                 goto errattr;
 514         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
 515                 goto errattr;
 516         port_state = smc_ib_port_active(smcibdev, port + 1);
 517         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
 518                 goto errattr;
 519         lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
 520         if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
 521                 goto errattr;
 522         nla_nest_end(skb, port_attrs);
 523         return 0;
 524 errattr:
 525         nla_nest_cancel(skb, port_attrs);
 526 errout:
 527         return -EMSGSIZE;
 528 }
 529
 530 static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
 531                                      struct sk_buff *skb)
 532 {
 533         if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
 534                 return false;
 535         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
 536                 return false;
 537         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
 538                 return false;
 539         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
 540                 return false;
 541         if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
 542                 return false;
 543         return true;
 544 }
 545
 546 static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
 547                                   struct sk_buff *skb,
 548                                   struct netlink_callback *cb)
 549 {
 550         char smc_ibname[IB_DEVICE_NAME_MAX];
 551         struct smc_pci_dev smc_pci_dev;
 552         struct pci_dev *pci_dev;
 553         unsigned char is_crit;
 554         struct nlattr *attrs;
 555         void *nlh;
 556         int i;
 557
 558         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 559                           &smc_gen_nl_family, NLM_F_MULTI,
 560                           SMC_NETLINK_GET_DEV_SMCR);
 561         if (!nlh)
 562                 goto errmsg;
 563         attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
 564         if (!attrs)
 565                 goto errout;
 566         is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
 567         if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
 568                 goto errattr;
 569         if (smcibdev->ibdev->dev.parent) {
 570                 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
 571                 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
 572                 smc_set_pci_values(pci_dev, &smc_pci_dev);
 573                 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
 574                         goto errattr;
 575         }
 576         snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
 577         if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
 578                 goto errattr;
 579         for (i = 1; i <= SMC_MAX_PORTS; i++) {
 580                 if (!rdma_is_port_valid(smcibdev->ibdev, i))
 581                         continue;
 582                 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
 583                                            smcibdev, i - 1))
 584                         goto errattr;
 585         }
 586
 587         nla_nest_end(skb, attrs);
 588         genlmsg_end(skb, nlh);
 589         return 0;
 590
 591 errattr:
 592         nla_nest_cancel(skb, attrs);
 593 errout:
 594         genlmsg_cancel(skb, nlh);
 595 errmsg:
 596         return -EMSGSIZE;
 597 }
 598
 599 static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
 600                                  struct sk_buff *skb,
 601                                  struct netlink_callback *cb)
 602 {
 603         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 604         struct smc_ib_device *smcibdev;
 605         int snum = cb_ctx->pos[0];
 606         int num = 0;
 607
 608         mutex_lock(&dev_list->mutex);
 609         list_for_each_entry(smcibdev, &dev_list->list, list) {
 610                 if (num < snum)
 611                         goto next;
 612                 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
 613                         goto errout;
 614 next:
 615                 num++;
 616         }
 617 errout:
 618         mutex_unlock(&dev_list->mutex);
 619         cb_ctx->pos[0] = num;
 620 }
 621
 622 int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
 623 {
 624         smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
 625         return skb->len;
 626 }
 627
 628 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
 629 {
 630         struct smc_link *lnk = (struct smc_link *)priv;
 631         struct smc_ib_device *smcibdev = lnk->smcibdev;
 632         u8 port_idx;
 633
 634         switch (ibevent->event) {
 635         case IB_EVENT_QP_FATAL:
 636         case IB_EVENT_QP_ACCESS_ERR:
 637                 port_idx = ibevent->element.qp->port - 1;
 638                 if (port_idx >= SMC_MAX_PORTS)
 639                         break;
 640                 set_bit(port_idx, &smcibdev->port_event_mask);
 641                 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
 642                         schedule_work(&smcibdev->port_event_work);
 643                 break;
 644         default:
 645                 break;
 646         }
 647 }
 648
 649 void smc_ib_destroy_queue_pair(struct smc_link *lnk)
 650 {
 651         if (lnk->roce_qp)
 652                 ib_destroy_qp(lnk->roce_qp);
 653         lnk->roce_qp = NULL;
 654 }
 655
 656 /* create a queue pair within the protection domain for a link */
 657 int smc_ib_create_queue_pair(struct smc_link *lnk)
 658 {
 659         int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
 660         struct ib_qp_init_attr qp_attr = {
 661                 .event_handler = smc_ib_qp_event_handler,
 662                 .qp_context = lnk,
 663                 .send_cq = lnk->smcibdev->roce_cq_send,
 664                 .recv_cq = lnk->smcibdev->roce_cq_recv,
 665                 .srq = NULL,
 666                 .cap = {
 667                                 /* include unsolicited rdma_writes as well,
 668                                  * there are max. 2 RDMA_WRITE per 1 WR_SEND
 669                                  */
 670                         .max_send_wr = SMC_WR_BUF_CNT * 3,
 671                         .max_recv_wr = SMC_WR_BUF_CNT * 3,
 672                         .max_send_sge = SMC_IB_MAX_SEND_SGE,
 673                         .max_recv_sge = sges_per_buf,
 674                 },
 675                 .sq_sig_type = IB_SIGNAL_REQ_WR,
 676                 .qp_type = IB_QPT_RC,
 677         };
 678         int rc;
 679
 680         lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
 681         rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
 682         if (IS_ERR(lnk->roce_qp))
 683                 lnk->roce_qp = NULL;
 684         else
 685                 smc_wr_remember_qp_attr(lnk);
 686         return rc;
 687 }
 688
 689 void smc_ib_put_memory_region(struct ib_mr *mr)
 690 {
 691         ib_dereg_mr(mr);
 692 }
 693
 694 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
 695 {
 696         unsigned int offset = 0;
 697         int sg_num;
 698
 699         /* map the largest prefix of a dma mapped SG list */
 700         sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx],
 701                               buf_slot->sgt[link_idx].sgl,
 702                               buf_slot->sgt[link_idx].orig_nents,
 703                               &offset, PAGE_SIZE);
 704
 705         return sg_num;
 706 }
 707
 708 /* Allocate a memory region and map the dma mapped SG list of buf_slot */
 709 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
 710                              struct smc_buf_desc *buf_slot, u8 link_idx)
 711 {
 712         if (buf_slot->mr_rx[link_idx])
 713                 return 0; /* already done */
 714
 715         buf_slot->mr_rx[link_idx] =
 716                 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
 717         if (IS_ERR(buf_slot->mr_rx[link_idx])) {
 718                 int rc;
 719
 720                 rc = PTR_ERR(buf_slot->mr_rx[link_idx]);
 721                 buf_slot->mr_rx[link_idx] = NULL;
 722                 return rc;
 723         }
 724
 725         if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1)
 726                 return -EINVAL;
 727
 728         return 0;
 729 }
 730
 731 /* synchronize buffer usage for cpu access */
 732 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
 733                             struct smc_buf_desc *buf_slot,
 734                             enum dma_data_direction data_direction)
 735 {
 736         struct scatterlist *sg;
 737         unsigned int i;
 738
 739         /* for now there is just one DMA address */
 740         for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
 741                     buf_slot->sgt[lnk->link_idx].nents, i) {
 742                 if (!sg_dma_len(sg))
 743                         break;
 744                 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
 745                                            sg_dma_address(sg),
 746                                            sg_dma_len(sg),
 747                                            data_direction);
 748         }
 749 }
 750
 751 /* synchronize buffer usage for device access */
 752 void smc_ib_sync_sg_for_device(struct smc_link *lnk,
 753                                struct smc_buf_desc *buf_slot,
 754                                enum dma_data_direction data_direction)
 755 {
 756         struct scatterlist *sg;
 757         unsigned int i;
 758
 759         /* for now there is just one DMA address */
 760         for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
 761                     buf_slot->sgt[lnk->link_idx].nents, i) {
 762                 if (!sg_dma_len(sg))
 763                         break;
 764                 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
 765                                               sg_dma_address(sg),
 766                                               sg_dma_len(sg),
 767                                               data_direction);
 768         }
 769 }
 770
 771 /* Map a new TX or RX buffer SG-table to DMA */
 772 int smc_ib_buf_map_sg(struct smc_link *lnk,
 773                       struct smc_buf_desc *buf_slot,
 774                       enum dma_data_direction data_direction)
 775 {
 776         int mapped_nents;
 777
 778         mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
 779                                      buf_slot->sgt[lnk->link_idx].sgl,
 780                                      buf_slot->sgt[lnk->link_idx].orig_nents,
 781                                      data_direction);
 782         if (!mapped_nents)
 783                 return -ENOMEM;
 784
 785         return mapped_nents;
 786 }
 787
 788 void smc_ib_buf_unmap_sg(struct smc_link *lnk,
 789                          struct smc_buf_desc *buf_slot,
 790                          enum dma_data_direction data_direction)
 791 {
 792         if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
 793                 return; /* already unmapped */
 794
 795         ib_dma_unmap_sg(lnk->smcibdev->ibdev,
 796                         buf_slot->sgt[lnk->link_idx].sgl,
 797                         buf_slot->sgt[lnk->link_idx].orig_nents,
 798                         data_direction);
 799         buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
 800 }
 801
 802 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
 803 {
 804         struct ib_cq_init_attr cqattr = {
 805                 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
 806         int cqe_size_order, smc_order;
 807         long rc;
 808
 809         mutex_lock(&smcibdev->mutex);
 810         rc = 0;
 811         if (smcibdev->initialized)
 812                 goto out;
 813         /* the calculated number of cq entries fits to mlx5 cq allocation */
 814         cqe_size_order = cache_line_size() == 128 ? 7 : 6;
 815         smc_order = MAX_ORDER - cqe_size_order - 1;
 816         if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
 817                 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
 818         smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
 819                                               smc_wr_tx_cq_handler, NULL,
 820                                               smcibdev, &cqattr);
 821         rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
 822         if (IS_ERR(smcibdev->roce_cq_send)) {
 823                 smcibdev->roce_cq_send = NULL;
 824                 goto out;
 825         }
 826         smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
 827                                               smc_wr_rx_cq_handler, NULL,
 828                                               smcibdev, &cqattr);
 829         rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
 830         if (IS_ERR(smcibdev->roce_cq_recv)) {
 831                 smcibdev->roce_cq_recv = NULL;
 832                 goto err;
 833         }
 834         smc_wr_add_dev(smcibdev);
 835         smcibdev->initialized = 1;
 836         goto out;
 837
 838 err:
 839         ib_destroy_cq(smcibdev->roce_cq_send);
 840 out:
 841         mutex_unlock(&smcibdev->mutex);
 842         return rc;
 843 }
 844
 845 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
 846 {
 847         mutex_lock(&smcibdev->mutex);
 848         if (!smcibdev->initialized)
 849                 goto out;
 850         smcibdev->initialized = 0;
 851         ib_destroy_cq(smcibdev->roce_cq_recv);
 852         ib_destroy_cq(smcibdev->roce_cq_send);
 853         smc_wr_remove_dev(smcibdev);
 854 out:
 855         mutex_unlock(&smcibdev->mutex);
 856 }
 857
 858 static struct ib_client smc_ib_client;
 859
 860 static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
 861 {
 862         struct ib_device *ibdev = smcibdev->ibdev;
 863         struct net_device *ndev;
 864
 865         if (!ibdev->ops.get_netdev)
 866                 return;
 867         ndev = ibdev->ops.get_netdev(ibdev, port + 1);
 868         if (ndev) {
 869                 smcibdev->ndev_ifidx[port] = ndev->ifindex;
 870                 dev_put(ndev);
 871         }
 872 }
 873
 874 void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
 875 {
 876         struct smc_ib_device *smcibdev;
 877         struct ib_device *libdev;
 878         struct net_device *lndev;
 879         u8 port_cnt;
 880         int i;
 881
 882         mutex_lock(&smc_ib_devices.mutex);
 883         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
 884                 port_cnt = smcibdev->ibdev->phys_port_cnt;
 885                 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
 886                         libdev = smcibdev->ibdev;
 887                         if (!libdev->ops.get_netdev)
 888                                 continue;
 889                         lndev = libdev->ops.get_netdev(libdev, i + 1);
 890                         dev_put(lndev);
 891                         if (lndev != ndev)
 892                                 continue;
 893                         if (event == NETDEV_REGISTER)
 894                                 smcibdev->ndev_ifidx[i] = ndev->ifindex;
 895                         if (event == NETDEV_UNREGISTER)
 896                                 smcibdev->ndev_ifidx[i] = 0;
 897                 }
 898         }
 899         mutex_unlock(&smc_ib_devices.mutex);
 900 }
 901
 902 /* callback function for ib_register_client() */
 903 static int smc_ib_add_dev(struct ib_device *ibdev)
 904 {
 905         struct smc_ib_device *smcibdev;
 906         u8 port_cnt;
 907         int i;
 908
 909         if (ibdev->node_type != RDMA_NODE_IB_CA)
 910                 return -EOPNOTSUPP;
 911
 912         smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
 913         if (!smcibdev)
 914                 return -ENOMEM;
 915
 916         smcibdev->ibdev = ibdev;
 917         INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
 918         atomic_set(&smcibdev->lnk_cnt, 0);
 919         init_waitqueue_head(&smcibdev->lnks_deleted);
 920         mutex_init(&smcibdev->mutex);
 921         mutex_lock(&smc_ib_devices.mutex);
 922         list_add_tail(&smcibdev->list, &smc_ib_devices.list);
 923         mutex_unlock(&smc_ib_devices.mutex);
 924         ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
 925         INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
 926                               smc_ib_global_event_handler);
 927         ib_register_event_handler(&smcibdev->event_handler);
 928
 929         /* trigger reading of the port attributes */
 930         port_cnt = smcibdev->ibdev->phys_port_cnt;
 931         pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
 932                             smcibdev->ibdev->name, port_cnt);
 933         for (i = 0;
 934              i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
 935              i++) {
 936                 set_bit(i, &smcibdev->port_event_mask);
 937                 /* determine pnetids of the port */
 938                 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
 939                                            smcibdev->pnetid[i]))
 940                         smc_pnetid_by_table_ib(smcibdev, i + 1);
 941                 smc_copy_netdev_ifindex(smcibdev, i);
 942                 pr_warn_ratelimited("smc:    ib device %s port %d has pnetid "
 943                                     "%.16s%s\n",
 944                                     smcibdev->ibdev->name, i + 1,
 945                                     smcibdev->pnetid[i],
 946                                     smcibdev->pnetid_by_user[i] ?
 947                                      " (user defined)" :
 948                                      "");
 949         }
 950         schedule_work(&smcibdev->port_event_work);
 951         return 0;
 952 }
 953
 954 /* callback function for ib_unregister_client() */
 955 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
 956 {
 957         struct smc_ib_device *smcibdev = client_data;
 958
 959         mutex_lock(&smc_ib_devices.mutex);
 960         list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
 961         mutex_unlock(&smc_ib_devices.mutex);
 962         pr_warn_ratelimited("smc: removing ib device %s\n",
 963                             smcibdev->ibdev->name);
 964         smc_smcr_terminate_all(smcibdev);
 965         smc_ib_cleanup_per_ibdev(smcibdev);
 966         ib_unregister_event_handler(&smcibdev->event_handler);
 967         cancel_work_sync(&smcibdev->port_event_work);
 968         kfree(smcibdev);
 969 }
 970
 971 static struct ib_client smc_ib_client = {
 972         .name   = "smc_ib",
 973         .add    = smc_ib_add_dev,
 974         .remove = smc_ib_remove_dev,
 975 };
 976
 977 int __init smc_ib_register_client(void)
 978 {
 979         smc_ib_init_local_systemid();
 980         return ib_register_client(&smc_ib_client);
 981 }
 982
 983 void smc_ib_unregister_client(void)
 984 {
 985         ib_unregister_client(&smc_ib_client);
 986 }