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/dibs.h"
21
22struct 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
27static bool smc_ism_v2_capable;
28static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
29
30static void smcd_register_dev(struct dibs_dev *dibs);
31static void smcd_unregister_dev(struct dibs_dev *dibs);
32static void smcd_handle_event(struct dibs_dev *dibs,
33 const struct dibs_event *event);
34static void smcd_handle_irq(struct dibs_dev *dibs, unsigned int dmbno,
35 u16 dmbemask);
36
37static struct dibs_client_ops smc_client_ops = {
38 .add_dev = smcd_register_dev,
39 .del_dev = smcd_unregister_dev,
40 .handle_event = smcd_handle_event,
41 .handle_irq = smcd_handle_irq,
42};
43
44static struct dibs_client smc_dibs_client = {
45 .name = "SMC-D",
46 .ops = &smc_client_ops,
47};
48
49static void smc_ism_create_system_eid(void)
50{
51 struct smc_ism_seid *seid =
52 (struct smc_ism_seid *)smc_ism_v2_system_eid;
53#if IS_ENABLED(CONFIG_S390)
54 struct cpuid id;
55 u16 ident_tail;
56 char tmp[5];
57
58 memcpy(seid->seid_string, "IBM-SYSZ-ISMSEID00000000", 24);
59 get_cpu_id(&id);
60 ident_tail = (u16)(id.ident & SMC_ISM_IDENT_MASK);
61 snprintf(tmp, 5, "%04X", ident_tail);
62 memcpy(seid->serial_number, tmp, 4);
63 snprintf(tmp, 5, "%04X", id.machine);
64 memcpy(seid->type, tmp, 4);
65#else
66 memset(seid, 0, SMC_MAX_EID_LEN);
67#endif
68}
69
70/* Test if an ISM communication is possible - same CPC */
71int smc_ism_cantalk(struct smcd_gid *peer_gid, unsigned short vlan_id,
72 struct smcd_dev *smcd)
73{
74 struct dibs_dev *dibs = smcd->dibs;
75 uuid_t ism_rgid;
76
77 copy_to_dibsgid(dibs_gid: &ism_rgid, sgid: peer_gid);
78 return dibs->ops->query_remote_gid(dibs, &ism_rgid, vlan_id ? 1 : 0,
79 vlan_id);
80}
81
82void smc_ism_get_system_eid(u8 **eid)
83{
84 if (!smc_ism_v2_capable)
85 *eid = NULL;
86 else
87 *eid = smc_ism_v2_system_eid;
88}
89
90u16 smc_ism_get_chid(struct smcd_dev *smcd)
91{
92 return smcd->dibs->ops->get_fabric_id(smcd->dibs);
93}
94
95/* HW supports ISM V2 and thus System EID is defined */
96bool smc_ism_is_v2_capable(void)
97{
98 return smc_ism_v2_capable;
99}
100
101void smc_ism_set_v2_capable(void)
102{
103 smc_ism_v2_capable = true;
104}
105
106/* Set a connection using this DMBE. */
107void smc_ism_set_conn(struct smc_connection *conn)
108{
109 unsigned long flags;
110
111 spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
112 conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = conn;
113 spin_unlock_irqrestore(lock: &conn->lgr->smcd->lock, flags);
114}
115
116/* Unset a connection using this DMBE. */
117void smc_ism_unset_conn(struct smc_connection *conn)
118{
119 unsigned long flags;
120
121 if (!conn->rmb_desc)
122 return;
123
124 spin_lock_irqsave(&conn->lgr->smcd->lock, flags);
125 conn->lgr->smcd->conn[conn->rmb_desc->sba_idx] = NULL;
126 spin_unlock_irqrestore(lock: &conn->lgr->smcd->lock, flags);
127}
128
129/* Register a VLAN identifier with the ISM device. Use a reference count
130 * and add a VLAN identifier only when the first DMB using this VLAN is
131 * registered.
132 */
133int smc_ism_get_vlan(struct smcd_dev *smcd, unsigned short vlanid)
134{
135 struct smc_ism_vlanid *new_vlan, *vlan;
136 unsigned long flags;
137 int rc = 0;
138
139 if (!vlanid) /* No valid vlan id */
140 return -EINVAL;
141 if (!smcd->dibs->ops->add_vlan_id)
142 return -EOPNOTSUPP;
143
144 /* create new vlan entry, in case we need it */
145 new_vlan = kzalloc(sizeof(*new_vlan), GFP_KERNEL);
146 if (!new_vlan)
147 return -ENOMEM;
148 new_vlan->vlanid = vlanid;
149 refcount_set(r: &new_vlan->refcnt, n: 1);
150
151 /* if there is an existing entry, increase count and return */
152 spin_lock_irqsave(&smcd->lock, flags);
153 list_for_each_entry(vlan, &smcd->vlan, list) {
154 if (vlan->vlanid == vlanid) {
155 refcount_inc(r: &vlan->refcnt);
156 kfree(objp: new_vlan);
157 goto out;
158 }
159 }
160
161 /* no existing entry found.
162 * add new entry to device; might fail, e.g., if HW limit reached
163 */
164 if (smcd->dibs->ops->add_vlan_id(smcd->dibs, vlanid)) {
165 kfree(objp: new_vlan);
166 rc = -EIO;
167 goto out;
168 }
169 list_add_tail(new: &new_vlan->list, head: &smcd->vlan);
170out:
171 spin_unlock_irqrestore(lock: &smcd->lock, flags);
172 return rc;
173}
174
175/* Unregister a VLAN identifier with the ISM device. Use a reference count
176 * and remove a VLAN identifier only when the last DMB using this VLAN is
177 * unregistered.
178 */
179int smc_ism_put_vlan(struct smcd_dev *smcd, unsigned short vlanid)
180{
181 struct smc_ism_vlanid *vlan;
182 unsigned long flags;
183 bool found = false;
184 int rc = 0;
185
186 if (!vlanid) /* No valid vlan id */
187 return -EINVAL;
188 if (!smcd->dibs->ops->del_vlan_id)
189 return -EOPNOTSUPP;
190
191 spin_lock_irqsave(&smcd->lock, flags);
192 list_for_each_entry(vlan, &smcd->vlan, list) {
193 if (vlan->vlanid == vlanid) {
194 if (!refcount_dec_and_test(r: &vlan->refcnt))
195 goto out;
196 found = true;
197 break;
198 }
199 }
200 if (!found) {
201 rc = -ENOENT;
202 goto out; /* VLAN id not in table */
203 }
204
205 /* Found and the last reference just gone */
206 if (smcd->dibs->ops->del_vlan_id(smcd->dibs, vlanid))
207 rc = -EIO;
208 list_del(entry: &vlan->list);
209 kfree(objp: vlan);
210out:
211 spin_unlock_irqrestore(lock: &smcd->lock, flags);
212 return rc;
213}
214
215void smc_ism_unregister_dmb(struct smcd_dev *smcd,
216 struct smc_buf_desc *dmb_desc)
217{
218 struct dibs_dmb dmb;
219
220 if (!dmb_desc->dma_addr)
221 return;
222
223 memset(&dmb, 0, sizeof(dmb));
224 dmb.dmb_tok = dmb_desc->token;
225 dmb.idx = dmb_desc->sba_idx;
226 dmb.cpu_addr = dmb_desc->cpu_addr;
227 dmb.dma_addr = dmb_desc->dma_addr;
228 dmb.dmb_len = dmb_desc->len;
229
230 smcd->dibs->ops->unregister_dmb(smcd->dibs, &dmb);
231
232 return;
233}
234
235int smc_ism_register_dmb(struct smc_link_group *lgr, int dmb_len,
236 struct smc_buf_desc *dmb_desc)
237{
238 struct dibs_dev *dibs;
239 struct dibs_dmb dmb;
240 int rc;
241
242 memset(&dmb, 0, sizeof(dmb));
243 dmb.dmb_len = dmb_len;
244 dmb.idx = dmb_desc->sba_idx;
245 dmb.vlan_id = lgr->vlan_id;
246 copy_to_dibsgid(dibs_gid: &dmb.rgid, sgid: &lgr->peer_gid);
247
248 dibs = lgr->smcd->dibs;
249 rc = dibs->ops->register_dmb(dibs, &dmb, &smc_dibs_client);
250 if (!rc) {
251 dmb_desc->sba_idx = dmb.idx;
252 dmb_desc->token = dmb.dmb_tok;
253 dmb_desc->cpu_addr = dmb.cpu_addr;
254 dmb_desc->dma_addr = dmb.dma_addr;
255 dmb_desc->len = dmb.dmb_len;
256 }
257 return rc;
258}
259
260bool smc_ism_support_dmb_nocopy(struct smcd_dev *smcd)
261{
262 /* for now only loopback-ism supports
263 * merging sndbuf with peer DMB to avoid
264 * data copies between them.
265 */
266 return (smcd->dibs->ops->support_mmapped_rdmb &&
267 smcd->dibs->ops->support_mmapped_rdmb(smcd->dibs));
268}
269
270int smc_ism_attach_dmb(struct smcd_dev *dev, u64 token,
271 struct smc_buf_desc *dmb_desc)
272{
273 struct dibs_dmb dmb;
274 int rc = 0;
275
276 if (!dev->dibs->ops->attach_dmb)
277 return -EINVAL;
278
279 memset(&dmb, 0, sizeof(dmb));
280 dmb.dmb_tok = token;
281 rc = dev->dibs->ops->attach_dmb(dev->dibs, &dmb);
282 if (!rc) {
283 dmb_desc->sba_idx = dmb.idx;
284 dmb_desc->token = dmb.dmb_tok;
285 dmb_desc->cpu_addr = dmb.cpu_addr;
286 dmb_desc->dma_addr = dmb.dma_addr;
287 dmb_desc->len = dmb.dmb_len;
288 dmb_desc->is_attached = true;
289 }
290 return rc;
291}
292
293int smc_ism_detach_dmb(struct smcd_dev *dev, u64 token)
294{
295 if (!dev->dibs->ops->detach_dmb)
296 return -EINVAL;
297
298 return dev->dibs->ops->detach_dmb(dev->dibs, token);
299}
300
301static int smc_nl_handle_smcd_dev(struct smcd_dev *smcd,
302 struct sk_buff *skb,
303 struct netlink_callback *cb)
304{
305 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
306 struct smc_pci_dev smc_pci_dev;
307 struct nlattr *port_attrs;
308 struct dibs_dev *dibs;
309 struct nlattr *attrs;
310 int use_cnt = 0;
311 void *nlh;
312
313 dibs = smcd->dibs;
314 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, seq: cb->nlh->nlmsg_seq,
315 family: &smc_gen_nl_family, NLM_F_MULTI,
316 cmd: SMC_NETLINK_GET_DEV_SMCD);
317 if (!nlh)
318 goto errmsg;
319 attrs = nla_nest_start(skb, attrtype: SMC_GEN_DEV_SMCD);
320 if (!attrs)
321 goto errout;
322 use_cnt = atomic_read(v: &smcd->lgr_cnt);
323 if (nla_put_u32(skb, attrtype: SMC_NLA_DEV_USE_CNT, value: use_cnt))
324 goto errattr;
325 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_IS_CRIT, value: use_cnt > 0))
326 goto errattr;
327 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
328 smc_set_pci_values(to_pci_dev(dibs->dev.parent), smc_dev: &smc_pci_dev);
329 if (nla_put_u32(skb, attrtype: SMC_NLA_DEV_PCI_FID, value: smc_pci_dev.pci_fid))
330 goto errattr;
331 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_CHID, value: smc_pci_dev.pci_pchid))
332 goto errattr;
333 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_VENDOR, value: smc_pci_dev.pci_vendor))
334 goto errattr;
335 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_DEVICE, value: smc_pci_dev.pci_device))
336 goto errattr;
337 if (nla_put_string(skb, attrtype: SMC_NLA_DEV_PCI_ID, str: smc_pci_dev.pci_id))
338 goto errattr;
339
340 port_attrs = nla_nest_start(skb, attrtype: SMC_NLA_DEV_PORT);
341 if (!port_attrs)
342 goto errattr;
343 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_PORT_PNET_USR, value: smcd->pnetid_by_user))
344 goto errportattr;
345 memcpy(smc_pnet, smcd->pnetid, SMC_MAX_PNETID_LEN);
346 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
347 if (nla_put_string(skb, attrtype: SMC_NLA_DEV_PORT_PNETID, str: smc_pnet))
348 goto errportattr;
349
350 nla_nest_end(skb, start: port_attrs);
351 nla_nest_end(skb, start: attrs);
352 genlmsg_end(skb, hdr: nlh);
353 return 0;
354
355errportattr:
356 nla_nest_cancel(skb, start: port_attrs);
357errattr:
358 nla_nest_cancel(skb, start: attrs);
359errout:
360 nlmsg_cancel(skb, nlh);
361errmsg:
362 return -EMSGSIZE;
363}
364
365static void smc_nl_prep_smcd_dev(struct smcd_dev_list *dev_list,
366 struct sk_buff *skb,
367 struct netlink_callback *cb)
368{
369 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(c: cb);
370 int snum = cb_ctx->pos[0];
371 struct smcd_dev *smcd;
372 int num = 0;
373
374 mutex_lock(&dev_list->mutex);
375 list_for_each_entry(smcd, &dev_list->list, list) {
376 if (num < snum)
377 goto next;
378 if (smc_ism_is_loopback(dibs: smcd->dibs))
379 goto next;
380 if (smc_nl_handle_smcd_dev(smcd, skb, cb))
381 goto errout;
382next:
383 num++;
384 }
385errout:
386 mutex_unlock(lock: &dev_list->mutex);
387 cb_ctx->pos[0] = num;
388}
389
390int smcd_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
391{
392 smc_nl_prep_smcd_dev(dev_list: &smcd_dev_list, skb, cb);
393 return skb->len;
394}
395
396struct smc_ism_event_work {
397 struct work_struct work;
398 struct smcd_dev *smcd;
399 struct dibs_event event;
400};
401
402#define ISM_EVENT_REQUEST 0x0001
403#define ISM_EVENT_RESPONSE 0x0002
404#define ISM_EVENT_REQUEST_IR 0x00000001
405#define ISM_EVENT_CODE_SHUTDOWN 0x80
406#define ISM_EVENT_CODE_TESTLINK 0x83
407
408union smcd_sw_event_info {
409 u64 info;
410 struct {
411 u8 uid[SMC_LGR_ID_SIZE];
412 unsigned short vlan_id;
413 u16 code;
414 };
415};
416
417static void smcd_handle_sw_event(struct smc_ism_event_work *wrk)
418{
419 struct dibs_dev *dibs = wrk->smcd->dibs;
420 union smcd_sw_event_info ev_info;
421 struct smcd_gid peer_gid;
422 uuid_t ism_rgid;
423
424 copy_to_smcdgid(sgid: &peer_gid, dibs_gid: &wrk->event.gid);
425 ev_info.info = wrk->event.data;
426 switch (wrk->event.subtype) {
427 case ISM_EVENT_CODE_SHUTDOWN: /* Peer shut down DMBs */
428 smc_smcd_terminate(dev: wrk->smcd, peer_gid: &peer_gid, vlan: ev_info.vlan_id);
429 break;
430 case ISM_EVENT_CODE_TESTLINK: /* Activity timer */
431 if (ev_info.code == ISM_EVENT_REQUEST &&
432 dibs->ops->signal_event) {
433 ev_info.code = ISM_EVENT_RESPONSE;
434 copy_to_dibsgid(dibs_gid: &ism_rgid, sgid: &peer_gid);
435 dibs->ops->signal_event(dibs, &ism_rgid,
436 ISM_EVENT_REQUEST_IR,
437 ISM_EVENT_CODE_TESTLINK,
438 ev_info.info);
439 }
440 break;
441 }
442}
443
444/* worker for SMC-D events */
445static void smc_ism_event_work(struct work_struct *work)
446{
447 struct smc_ism_event_work *wrk =
448 container_of(work, struct smc_ism_event_work, work);
449 struct smcd_gid smcd_gid;
450
451 copy_to_smcdgid(sgid: &smcd_gid, dibs_gid: &wrk->event.gid);
452
453 switch (wrk->event.type) {
454 case DIBS_DEV_EVENT: /* GID event, token is peer GID */
455 smc_smcd_terminate(dev: wrk->smcd, peer_gid: &smcd_gid, VLAN_VID_MASK);
456 break;
457 case DIBS_BUF_EVENT:
458 break;
459 case DIBS_SW_EVENT: /* Software defined event */
460 smcd_handle_sw_event(wrk);
461 break;
462 }
463 kfree(objp: wrk);
464}
465
466static struct smcd_dev *smcd_alloc_dev(const char *name, int max_dmbs)
467{
468 struct smcd_dev *smcd;
469
470 smcd = kzalloc(sizeof(*smcd), GFP_KERNEL);
471 if (!smcd)
472 return NULL;
473 smcd->conn = kcalloc(max_dmbs, sizeof(struct smc_connection *),
474 GFP_KERNEL);
475 if (!smcd->conn)
476 goto free_smcd;
477
478 smcd->event_wq = alloc_ordered_workqueue("ism_evt_wq-%s)",
479 WQ_MEM_RECLAIM, name);
480 if (!smcd->event_wq)
481 goto free_conn;
482
483 spin_lock_init(&smcd->lock);
484 spin_lock_init(&smcd->lgr_lock);
485 INIT_LIST_HEAD(list: &smcd->vlan);
486 INIT_LIST_HEAD(list: &smcd->lgr_list);
487 init_waitqueue_head(&smcd->lgrs_deleted);
488 return smcd;
489
490free_conn:
491 kfree(objp: smcd->conn);
492free_smcd:
493 kfree(objp: smcd);
494 return NULL;
495}
496
497static void smcd_register_dev(struct dibs_dev *dibs)
498{
499 struct smcd_dev *smcd, *fentry;
500 int max_dmbs;
501
502 max_dmbs = dibs->ops->max_dmbs();
503
504 smcd = smcd_alloc_dev(name: dev_name(dev: &dibs->dev), max_dmbs);
505 if (!smcd)
506 return;
507
508 smcd->dibs = dibs;
509 dibs_set_priv(dev: dibs, client: &smc_dibs_client, priv: smcd);
510
511 if (smc_pnetid_by_dev_port(dev: dibs->dev.parent, port: 0, pnetid: smcd->pnetid))
512 smc_pnetid_by_table_smcd(smcd);
513
514 if (smc_ism_is_loopback(dibs) ||
515 (dibs->ops->add_vlan_id &&
516 !dibs->ops->add_vlan_id(dibs, ISM_RESERVED_VLANID))) {
517 smc_ism_set_v2_capable();
518 }
519
520 mutex_lock(&smcd_dev_list.mutex);
521 /* sort list:
522 * - devices without pnetid before devices with pnetid;
523 * - loopback-ism always at the very beginning;
524 */
525 if (!smcd->pnetid[0]) {
526 fentry = list_first_entry_or_null(&smcd_dev_list.list,
527 struct smcd_dev, list);
528 if (fentry && smc_ism_is_loopback(dibs: fentry->dibs))
529 list_add(new: &smcd->list, head: &fentry->list);
530 else
531 list_add(new: &smcd->list, head: &smcd_dev_list.list);
532 } else {
533 list_add_tail(new: &smcd->list, head: &smcd_dev_list.list);
534 }
535 mutex_unlock(lock: &smcd_dev_list.mutex);
536
537 if (smc_pnet_is_pnetid_set(pnetid: smcd->pnetid))
538 pr_warn_ratelimited("smc: adding smcd device %s with pnetid %.16s%s\n",
539 dev_name(&dibs->dev), smcd->pnetid,
540 smcd->pnetid_by_user ?
541 " (user defined)" :
542 "");
543 else
544 pr_warn_ratelimited("smc: adding smcd device %s without pnetid\n",
545 dev_name(&dibs->dev));
546 return;
547}
548
549static void smcd_unregister_dev(struct dibs_dev *dibs)
550{
551 struct smcd_dev *smcd = dibs_get_priv(dev: dibs, client: &smc_dibs_client);
552
553 pr_warn_ratelimited("smc: removing smcd device %s\n",
554 dev_name(&dibs->dev));
555 smcd->going_away = 1;
556 smc_smcd_terminate_all(dev: smcd);
557 mutex_lock(&smcd_dev_list.mutex);
558 list_del_init(entry: &smcd->list);
559 mutex_unlock(lock: &smcd_dev_list.mutex);
560 destroy_workqueue(wq: smcd->event_wq);
561 kfree(objp: smcd->conn);
562 kfree(objp: smcd);
563}
564
565/* SMCD Device event handler. Called from ISM device interrupt handler.
566 * Parameters are ism device pointer,
567 * - event->type (0 --> DMB, 1 --> GID),
568 * - event->code (event code),
569 * - event->tok (either DMB token when event type 0, or GID when event type 1)
570 * - event->time (time of day)
571 * - event->info (debug info).
572 *
573 * Context:
574 * - Function called in IRQ context from ISM device driver event handler.
575 */
576static void smcd_handle_event(struct dibs_dev *dibs,
577 const struct dibs_event *event)
578{
579 struct smcd_dev *smcd = dibs_get_priv(dev: dibs, client: &smc_dibs_client);
580 struct smc_ism_event_work *wrk;
581
582 if (smcd->going_away)
583 return;
584 /* copy event to event work queue, and let it be handled there */
585 wrk = kmalloc(sizeof(*wrk), GFP_ATOMIC);
586 if (!wrk)
587 return;
588 INIT_WORK(&wrk->work, smc_ism_event_work);
589 wrk->smcd = smcd;
590 wrk->event = *event;
591 queue_work(wq: smcd->event_wq, work: &wrk->work);
592}
593
594/* SMCD Device interrupt handler. Called from ISM device interrupt handler.
595 * Parameters are the ism device pointer, DMB number, and the DMBE bitmask.
596 * Find the connection and schedule the tasklet for this connection.
597 *
598 * Context:
599 * - Function called in IRQ context from ISM device driver IRQ handler.
600 */
601static void smcd_handle_irq(struct dibs_dev *dibs, unsigned int dmbno,
602 u16 dmbemask)
603{
604 struct smcd_dev *smcd = dibs_get_priv(dev: dibs, client: &smc_dibs_client);
605 struct smc_connection *conn = NULL;
606 unsigned long flags;
607
608 spin_lock_irqsave(&smcd->lock, flags);
609 conn = smcd->conn[dmbno];
610 if (conn && !conn->killed)
611 tasklet_schedule(t: &conn->rx_tsklet);
612 spin_unlock_irqrestore(lock: &smcd->lock, flags);
613}
614
615int smc_ism_signal_shutdown(struct smc_link_group *lgr)
616{
617 int rc = 0;
618 union smcd_sw_event_info ev_info;
619 uuid_t ism_rgid;
620
621 if (lgr->peer_shutdown)
622 return 0;
623 if (!lgr->smcd->dibs->ops->signal_event)
624 return 0;
625
626 memcpy(ev_info.uid, lgr->id, SMC_LGR_ID_SIZE);
627 ev_info.vlan_id = lgr->vlan_id;
628 ev_info.code = ISM_EVENT_REQUEST;
629 copy_to_dibsgid(dibs_gid: &ism_rgid, sgid: &lgr->peer_gid);
630 rc = lgr->smcd->dibs->ops->signal_event(lgr->smcd->dibs, &ism_rgid,
631 ISM_EVENT_REQUEST_IR,
632 ISM_EVENT_CODE_SHUTDOWN,
633 ev_info.info);
634 return rc;
635}
636
637int smc_ism_init(void)
638{
639 int rc = 0;
640
641 smc_ism_v2_capable = false;
642 smc_ism_create_system_eid();
643
644 rc = dibs_register_client(client: &smc_dibs_client);
645 return rc;
646}
647
648void smc_ism_exit(void)
649{
650 dibs_unregister_client(client: &smc_dibs_client);
651}
652

source code of linux/net/smc/smc_ism.c