net/smc/smc_ism.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Shared Memory Communications Direct over ISM devices (SMC-D)
   3  *
   4  * Functions for ISM device.
   5  *
   6  * Copyright IBM Corp. 2018
   7  */
   8
   9 #include <linux/if_vlan.h>
  10 #include <linux/spinlock.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <asm/page.h>
  14
  15 #include "smc.h"
  16 #include "smc_core.h"
  17 #include "smc_ism.h"
  18 #include "smc_pnet.h"
  19 #include "smc_netlink.h"
  20 #include "linux/ism.h"
  21
  22 struct smcd_dev_list smcd_dev_list = {
  23         .list = LIST_HEAD_INIT(smcd_dev_list.list),
  24         .mutex = __MUTEX_INITIALIZER(smcd_dev_list.mutex)
  25 };
  26
  27 static bool smc_ism_v2_capable;
  28 static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
  29
  30 #if IS_ENABLED(CONFIG_ISM)
  31 static void smcd_register_dev(struct ism_dev *ism);
  32 static void smcd_unregister_dev(struct ism_dev *ism);
  33 static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event);
  34 static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
  35                             u16 dmbemask);
  36
  37 static struct ism_client smc_ism_client = {
  38         .name = "SMC-D",
  39         .add = smcd_register_dev,
  40         .remove = smcd_unregister_dev,
  41         .handle_event = smcd_handle_event,
  42         .handle_irq = smcd_handle_irq,
  43 };
  44 #endif
  45
  46 static void smc_ism_create_system_eid(void)
  47 {
  48         struct smc_ism_seid *seid =
  49                 (struct smc_ism_seid *)smc_ism_v2_system_eid;
  50 #if IS_ENABLED(CONFIG_S390)
  51         struct cpuid id;
  52         u16 ident_tail;
  53         char tmp[5];
  54
  55         memcpy(seid->seid_string, "IBM-SYSZ-ISMSEID00000000", 24);
  56         get_cpu_id(&id);
  57         ident_tail = (u16)(id.ident & SMC_ISM_IDENT_MASK);
  58         snprintf(tmp, 5, "%04X", ident_tail);
  59         memcpy(seid->serial_number, tmp, 4);
  60         snprintf(tmp, 5, "%04X", id.machine);
  61         memcpy(seid->type, tmp, 4);
  62 #else
  63         memset(seid, 0, SMC_MAX_EID_LEN);
  64 #endif
  65 }
  66
  67 /* Test if an ISM communication is possible - same CPC */
  68 int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
  69                     struct smcd_dev *smcd)
  70 {
  71         return smcd->ops->query_remote_gid(smcd, peer_gid, vlan_id ? 1 : 0,
  72                                            vlan_id);
  73 }
  74
  75 void smc_ism_get_system_eid(u8 **eid)
  76 {
  77         if (!smc_ism_v2_capable)
  78                 *eid = NULL;
  79         else
  80                 *eid = smc_ism_v2_system_eid;
  81 }
  82
  83 u16 smc_ism_get_chid(struct smcd_dev *smcd)
  84 {
  85         return smcd->ops->get_chid(smcd);
  86 }
  87
  88 /* HW supports ISM V2 and thus System EID is defined */
  89 bool smc_ism_is_v2_capable(void)
  90 {
  91         return smc_ism_v2_capable;
  92 }
  93
  94 void smc_ism_set_v2_capable(void)
  95 {
  96         smc_ism_v2_capable = true;
  97 }
  98
  99 /* Set a connection using this DMBE. */
 100 void smc_ism_set_conn(struct smc_connection *conn)
 101 {
 102         unsigned long flags;
 103
 104         spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
 105         conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
 106         spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
 107 }
 108
 109 /* Unset a connection using this DMBE. */
 110 void smc_ism_unset_conn(struct smc_connection *conn)
 111 {
 112         unsigned long flags;
 113
 114         if (!conn->rmb_desc)
 115                 return;
 116
 117         spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
 118         conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
 119         spin_unlock_irqrestore(&conn->lgr->smcd->lock, flags);
 120 }
 121
 122 /* Register a VLAN identifier with the ISM device. Use a reference count
 123  * and add a VLAN identifier only when the first DMB using this VLAN is
 124  * registered.
 125  */
 126 int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
 127 {
 128         struct smc_ism_vlanid *new_vlan, *vlan;
 129         unsigned long flags;
 130         int rc = 0;
 131
 132         if (!vlanid)                    /* No valid vlan id */
 133                 return -EINVAL;
 134         if (!smcd->ops->add_vlan_id)
 135                 return -EOPNOTSUPP;
 136
 137         /* create new vlan entry, in case we need it */
 138         new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
 139         if (!new_vlan)
 140                 return -ENOMEM;
 141         new_vlan->vlanid = vlanid;
 142         refcount_set(&new_vlan->refcnt, 1);
 143
 144         /* if there is an existing entry, increase count and return */
 145         spin_lock_irqsave(&smcd->lock, flags);
 146         list_for_each_entry(vlan, &smcd->vlan, list) {
 147                 if (vlan->vlanid == vlanid) {
 148                         refcount_inc(&vlan->refcnt);
 149                         kfree(new_vlan);
 150                         goto out;
 151                 }
 152         }
 153
 154         /* no existing entry found.
 155          * add new entry to device; might fail, e.g., if HW limit reached
 156          */
 157         if (smcd->ops->add_vlan_id(smcd, vlanid)) {
 158                 kfree(new_vlan);
 159                 rc = -EIO;
 160                 goto out;
 161         }
 162         list_add_tail(&new_vlan->list, &smcd->vlan);
 163 out:
 164         spin_unlock_irqrestore(&smcd->lock, flags);
 165         return rc;
 166 }
 167
 168 /* Unregister a VLAN identifier with the ISM device. Use a reference count
 169  * and remove a VLAN identifier only when the last DMB using this VLAN is
 170  * unregistered.
 171  */
 172 int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
 173 {
 174         struct smc_ism_vlanid *vlan;
 175         unsigned long flags;
 176         bool found = false;
 177         int rc = 0;
 178
 179         if (!vlanid)                    /* No valid vlan id */
 180                 return -EINVAL;
 181         if (!smcd->ops->del_vlan_id)
 182                 return -EOPNOTSUPP;
 183
 184         spin_lock_irqsave(&smcd->lock, flags);
 185         list_for_each_entry(vlan, &smcd->vlan, list) {
 186                 if (vlan->vlanid == vlanid) {
 187                         if (!refcount_dec_and_test(&vlan->refcnt))
 188                                 goto out;
 189                         found = true;
 190                         break;
 191                 }
 192         }
 193         if (!found) {
 194                 rc = -ENOENT;
 195                 goto out;               /* VLAN id not in table */
 196         }
 197
 198         /* Found and the last reference just gone */
 199         if (smcd->ops->del_vlan_id(smcd, vlanid))
 200                 rc = -EIO;
 201         list_del(&vlan->list);
 202         kfree(vlan);
 203 out:
 204         spin_unlock_irqrestore(&smcd->lock, flags);
 205         return rc;
 206 }
 207
 208 int smc_ism_unregister_dmb(struct smcd_dev *smcd, struct smc_buf_desc *dmb_desc)
 209 {
 210         struct smcd_dmb dmb;
 211         int rc = 0;
 212
 213         if (!dmb_desc->dma_addr)
 214                 return rc;
 215
 216         memset(&dmb, 0, sizeof(dmb));
 217         dmb.dmb_tok = dmb_desc->token;
 218         dmb.sba_idx = dmb_desc->sba_idx;
 219         dmb.cpu_addr = dmb_desc->cpu_addr;
 220         dmb.dma_addr = dmb_desc->dma_addr;
 221         dmb.dmb_len = dmb_desc->len;
 222         rc = smcd->ops->unregister_dmb(smcd, &dmb);
 223         if (!rc || rc == ISM_ERROR) {
 224                 dmb_desc->cpu_addr = NULL;
 225                 dmb_desc->dma_addr = 0;
 226         }
 227
 228         return rc;
 229 }
 230
 231 int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
 232                          struct smc_buf_desc *dmb_desc)
 233 {
 234         struct smcd_dmb dmb;
 235         int rc;
 236
 237         memset(&dmb, 0, sizeof(dmb));
 238         dmb.dmb_len = dmb_len;
 239         dmb.sba_idx = dmb_desc->sba_idx;
 240         dmb.vlan_id = lgr->vlan_id;
 241         dmb.rgid = lgr->peer_gid.gid;
 242         rc = lgr->smcd->ops->register_dmb(lgr->smcd, &dmb, lgr->smcd->client);
 243         if (!rc) {
 244                 dmb_desc->sba_idx = dmb.sba_idx;
 245                 dmb_desc->token = dmb.dmb_tok;
 246                 dmb_desc->cpu_addr = dmb.cpu_addr;
 247                 dmb_desc->dma_addr = dmb.dma_addr;
 248                 dmb_desc->len = dmb.dmb_len;
 249         }
 250         return rc;
 251 }
 252
 253 bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd)
 254 {
 255         /* for now only loopback-ism supports
 256          * merging sndbuf with peer DMB to avoid
 257          * data copies between them.
 258          */
 259         return (smcd->ops->support_dmb_nocopy &&
 260                 smcd->ops->support_dmb_nocopy(smcd));
 261 }
 262
 263 int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
 264                        struct smc_buf_desc *dmb_desc)
 265 {
 266         struct smcd_dmb dmb;
 267         int rc = 0;
 268
 269         if (!dev->ops->attach_dmb)
 270                 return -EINVAL;
 271
 272         memset(&dmb, 0, sizeof(dmb));
 273         dmb.dmb_tok = token;
 274         rc = dev->ops->attach_dmb(dev, &dmb);
 275         if (!rc) {
 276                 dmb_desc->sba_idx = dmb.sba_idx;
 277                 dmb_desc->token = dmb.dmb_tok;
 278                 dmb_desc->cpu_addr = dmb.cpu_addr;
 279                 dmb_desc->dma_addr = dmb.dma_addr;
 280                 dmb_desc->len = dmb.dmb_len;
 281         }
 282         return rc;
 283 }
 284
 285 int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token)
 286 {
 287         if (!dev->ops->detach_dmb)
 288                 return -EINVAL;
 289
 290         return dev->ops->detach_dmb(dev, token);
 291 }
 292
 293 static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
 294                                   struct sk_buff *skb,
 295                                   struct netlink_callback *cb)
 296 {
 297         char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 298         struct smc_pci_dev smc_pci_dev;
 299         struct nlattr *port_attrs;
 300         struct nlattr *attrs;
 301         struct ism_dev *ism;
 302         int use_cnt = 0;
 303         void *nlh;
 304
 305         ism = smcd->priv;
 306         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 307                           &smc_gen_nl_family, NLM_F_MULTI,
 308                           SMC_NETLINK_GET_DEV_SMCD);
 309         if (!nlh)
 310                 goto errmsg;
 311         attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCD);
 312         if (!attrs)
 313                 goto errout;
 314         use_cnt = atomic_read(&smcd->lgr_cnt);
 315         if (nla_put_u32(skb, SMC_NLA_DEV_USE_CNT, use_cnt))
 316                 goto errattr;
 317         if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, use_cnt > 0))
 318                 goto errattr;
 319         memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
 320         smc_set_pci_values(to_pci_dev(ism->dev.parent), &smc_pci_dev);
 321         if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev.pci_fid))
 322                 goto errattr;
 323         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev.pci_pchid))
 324                 goto errattr;
 325         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev.pci_vendor))
 326                 goto errattr;
 327         if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev.pci_device))
 328                 goto errattr;
 329         if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev.pci_id))
 330                 goto errattr;
 331
 332         port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT);
 333         if (!port_attrs)
 334                 goto errattr;
 335         if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR, smcd->pnetid_by_user))
 336                 goto errportattr;
 337         memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
 338         smc_pnet[SMC_MAX_PNETID_LEN] = 0;
 339         if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
 340                 goto errportattr;
 341
 342         nla_nest_end(skb, port_attrs);
 343         nla_nest_end(skb, attrs);
 344         genlmsg_end(skb, nlh);
 345         return 0;
 346
 347 errportattr:
 348         nla_nest_cancel(skb, port_attrs);
 349 errattr:
 350         nla_nest_cancel(skb, attrs);
 351 errout:
 352         nlmsg_cancel(skb, nlh);
 353 errmsg:
 354         return -EMSGSIZE;
 355 }
 356
 357 static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
 358                                  struct sk_buff *skb,
 359                                  struct netlink_callback *cb)
 360 {
 361         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 362         int snum = cb_ctx->pos[0];
 363         struct smcd_dev *smcd;
 364         int num = 0;
 365
 366         mutex_lock(&dev_list->mutex);
 367         list_for_each_entry(smcd, &dev_list->list, list) {
 368                 if (num < snum)
 369                         goto next;
 370                 if (smc_ism_is_loopback(smcd))
 371                         goto next;
 372                 if (smc_nl_handle_smcd_dev(smcd, skb, cb))
 373                         goto errout;
 374 next:
 375                 num++;
 376         }
 377 errout:
 378         mutex_unlock(&dev_list->mutex);
 379         cb_ctx->pos[0] = num;
 380 }
 381
 382 int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
 383 {
 384         smc_nl_prep_smcd_dev(&smcd_dev_list, skb, cb);
 385         return skb->len;
 386 }
 387
 388 #if IS_ENABLED(CONFIG_ISM)
 389 struct smc_ism_event_work {
 390         struct work_struct work;
 391         struct smcd_dev *smcd;
 392         struct ism_event event;
 393 };
 394
 395 #define ISM_EVENT_REQUEST               0x0001
 396 #define ISM_EVENT_RESPONSE              0x0002
 397 #define ISM_EVENT_REQUEST_IR            0x00000001
 398 #define ISM_EVENT_CODE_SHUTDOWN         0x80
 399 #define ISM_EVENT_CODE_TESTLINK         0x83
 400
 401 union smcd_sw_event_info {
 402         u64     info;
 403         struct {
 404                 u8              uid[SMC_LGR_ID_SIZE];
 405                 unsigned short  vlan_id;
 406                 u16             code;
 407         };
 408 };
 409
 410 static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
 411 {
 412         struct smcd_gid peer_gid = { .gid = wrk->event.tok,
 413                                      .gid_ext = 0 };
 414         union smcd_sw_event_info ev_info;
 415
 416         ev_info.info = wrk->event.info;
 417         switch (wrk->event.code) {
 418         case ISM_EVENT_CODE_SHUTDOWN:   /* Peer shut down DMBs */
 419                 smc_smcd_terminate(wrk->smcd, &peer_gid, ev_info.vlan_id);
 420                 break;
 421         case ISM_EVENT_CODE_TESTLINK:   /* Activity timer */
 422                 if (ev_info.code == ISM_EVENT_REQUEST &&
 423                     wrk->smcd->ops->signal_event) {
 424                         ev_info.code = ISM_EVENT_RESPONSE;
 425                         wrk->smcd->ops->signal_event(wrk->smcd,
 426                                                      &peer_gid,
 427                                                      ISM_EVENT_REQUEST_IR,
 428                                                      ISM_EVENT_CODE_TESTLINK,
 429                                                      ev_info.info);
 430                         }
 431                 break;
 432         }
 433 }
 434
 435 /* worker for SMC-D events */
 436 static void smc_ism_event_work(struct work_struct *work)
 437 {
 438         struct smc_ism_event_work *wrk =
 439                 container_of(work, struct smc_ism_event_work, work);
 440         struct smcd_gid smcd_gid = { .gid = wrk->event.tok,
 441                                      .gid_ext = 0 };
 442
 443         switch (wrk->event.type) {
 444         case ISM_EVENT_GID:     /* GID event, token is peer GID */
 445                 smc_smcd_terminate(wrk->smcd, &smcd_gid, VLAN_VID_MASK);
 446                 break;
 447         case ISM_EVENT_DMB:
 448                 break;
 449         case ISM_EVENT_SWR:     /* Software defined event */
 450                 smcd_handle_sw_event(wrk);
 451                 break;
 452         }
 453         kfree(wrk);
 454 }
 455
 456 static struct smcd_dev *smcd_alloc_dev(struct device *parent, const char *name,
 457                                        const struct smcd_ops *ops, int max_dmbs)
 458 {
 459         struct smcd_dev *smcd;
 460
 461         smcd = devm_kzalloc(parent, sizeof(*smcd), GFP_KERNEL);
 462         if (!smcd)
 463                 return NULL;
 464         smcd->conn = devm_kcalloc(parent, max_dmbs,
 465                                   sizeof(struct smc_connection *), GFP_KERNEL);
 466         if (!smcd->conn)
 467                 return NULL;
 468
 469         smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
 470                                                  WQ_MEM_RECLAIM, name);
 471         if (!smcd->event_wq)
 472                 return NULL;
 473
 474         smcd->ops = ops;
 475
 476         spin_lock_init(&smcd->lock);
 477         spin_lock_init(&smcd->lgr_lock);
 478         INIT_LIST_HEAD(&smcd->vlan);
 479         INIT_LIST_HEAD(&smcd->lgr_list);
 480         init_waitqueue_head(&smcd->lgrs_deleted);
 481         return smcd;
 482 }
 483
 484 static void smcd_register_dev(struct ism_dev *ism)
 485 {
 486         const struct smcd_ops *ops = ism_get_smcd_ops();
 487         struct smcd_dev *smcd, *fentry;
 488
 489         if (!ops)
 490                 return;
 491
 492         smcd = smcd_alloc_dev(&ism->pdev->dev, dev_name(&ism->pdev->dev), ops,
 493                               ISM_NR_DMBS);
 494         if (!smcd)
 495                 return;
 496         smcd->priv = ism;
 497         smcd->client = &smc_ism_client;
 498         ism_set_priv(ism, &smc_ism_client, smcd);
 499         if (smc_pnetid_by_dev_port(&ism->pdev->dev, 0, smcd->pnetid))
 500                 smc_pnetid_by_table_smcd(smcd);
 501
 502         if (smcd->ops->supports_v2())
 503                 smc_ism_set_v2_capable();
 504         mutex_lock(&smcd_dev_list.mutex);
 505         /* sort list:
 506          * - devices without pnetid before devices with pnetid;
 507          * - loopback-ism always at the very beginning;
 508          */
 509         if (!smcd->pnetid[0]) {
 510                 fentry = list_first_entry_or_null(&smcd_dev_list.list,
 511                                                   struct smcd_dev, list);
 512                 if (fentry && smc_ism_is_loopback(fentry))
 513                         list_add(&smcd->list, &fentry->list);
 514                 else
 515                         list_add(&smcd->list, &smcd_dev_list.list);
 516         } else {
 517                 list_add_tail(&smcd->list, &smcd_dev_list.list);
 518         }
 519         mutex_unlock(&smcd_dev_list.mutex);
 520
 521         pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
 522                             dev_name(&ism->dev), smcd->pnetid,
 523                             smcd->pnetid_by_user ? " (user defined)" : "");
 524
 525         return;
 526 }
 527
 528 static void smcd_unregister_dev(struct ism_dev *ism)
 529 {
 530         struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
 531
 532         pr_warn_ratelimited("smc: removing smcd device %s\n",
 533                             dev_name(&ism->dev));
 534         smcd->going_away = 1;
 535         smc_smcd_terminate_all(smcd);
 536         mutex_lock(&smcd_dev_list.mutex);
 537         list_del_init(&smcd->list);
 538         mutex_unlock(&smcd_dev_list.mutex);
 539         destroy_workqueue(smcd->event_wq);
 540 }
 541
 542 /* SMCD Device event handler. Called from ISM device interrupt handler.
 543  * Parameters are ism device pointer,
 544  * - event->type (0 --> DMB, 1 --> GID),
 545  * - event->code (event code),
 546  * - event->tok (either DMB token when event type 0, or GID when event type 1)
 547  * - event->time (time of day)
 548  * - event->info (debug info).
 549  *
 550  * Context:
 551  * - Function called in IRQ context from ISM device driver event handler.
 552  */
 553 static void smcd_handle_event(struct ism_dev *ism, struct ism_event *event)
 554 {
 555         struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
 556         struct smc_ism_event_work *wrk;
 557
 558         if (smcd->going_away)
 559                 return;
 560         /* copy event to event work queue, and let it be handled there */
 561         wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
 562         if (!wrk)
 563                 return;
 564         INIT_WORK(&wrk->work, smc_ism_event_work);
 565         wrk->smcd = smcd;
 566         wrk->event = *event;
 567         queue_work(smcd->event_wq, &wrk->work);
 568 }
 569
 570 /* SMCD Device interrupt handler. Called from ISM device interrupt handler.
 571  * Parameters are the ism device pointer, DMB number, and the DMBE bitmask.
 572  * Find the connection and schedule the tasklet for this connection.
 573  *
 574  * Context:
 575  * - Function called in IRQ context from ISM device driver IRQ handler.
 576  */
 577 static void smcd_handle_irq(struct ism_dev *ism, unsigned int dmbno,
 578                             u16 dmbemask)
 579 {
 580         struct smcd_dev *smcd = ism_get_priv(ism, &smc_ism_client);
 581         struct smc_connection *conn = NULL;
 582         unsigned long flags;
 583
 584         spin_lock_irqsave(&smcd->lock, flags);
 585         conn = smcd->conn[dmbno];
 586         if (conn && !conn->killed)
 587                 tasklet_schedule(&conn->rx_tsklet);
 588         spin_unlock_irqrestore(&smcd->lock, flags);
 589 }
 590 #endif
 591
 592 int smc_ism_signal_shutdown(struct smc_link_group *lgr)
 593 {
 594         int rc = 0;
 595 #if IS_ENABLED(CONFIG_ISM)
 596         union smcd_sw_event_info ev_info;
 597
 598         if (lgr->peer_shutdown)
 599                 return 0;
 600         if (!lgr->smcd->ops->signal_event)
 601                 return 0;
 602
 603         memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
 604         ev_info.vlan_id = lgr->vlan_id;
 605         ev_info.code = ISM_EVENT_REQUEST;
 606         rc = lgr->smcd->ops->signal_event(lgr->smcd, &lgr->peer_gid,
 607                                           ISM_EVENT_REQUEST_IR,
 608                                           ISM_EVENT_CODE_SHUTDOWN,
 609                                           ev_info.info);
 610 #endif
 611         return rc;
 612 }
 613
 614 int smc_ism_init(void)
 615 {
 616         int rc = 0;
 617
 618         smc_ism_v2_capable = false;
 619         smc_ism_create_system_eid();
 620
 621 #if IS_ENABLED(CONFIG_ISM)
 622         rc = ism_register_client(&smc_ism_client);
 623 #endif
 624         return rc;
 625 }
 626
 627 void smc_ism_exit(void)
 628 {
 629 #if IS_ENABLED(CONFIG_ISM)
 630         ism_unregister_client(&smc_ism_client);
 631 #endif
 632 }