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-rw-r--r--net/smc/smc_core.c1973
1 files changed, 1973 insertions, 0 deletions
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
new file mode 100644
index 000000000..bf485a201
--- /dev/null
+++ b/net/smc/smc_core.c
@@ -0,0 +1,1973 @@
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * Basic Transport Functions exploiting Infiniband API
6 *
7 * Copyright IBM Corp. 2016
8 *
9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
10 */
11
12#include <linux/socket.h>
13#include <linux/if_vlan.h>
14#include <linux/random.h>
15#include <linux/workqueue.h>
16#include <linux/wait.h>
17#include <linux/reboot.h>
18#include <linux/mutex.h>
19#include <net/tcp.h>
20#include <net/sock.h>
21#include <rdma/ib_verbs.h>
22#include <rdma/ib_cache.h>
23
24#include "smc.h"
25#include "smc_clc.h"
26#include "smc_core.h"
27#include "smc_ib.h"
28#include "smc_wr.h"
29#include "smc_llc.h"
30#include "smc_cdc.h"
31#include "smc_close.h"
32#include "smc_ism.h"
33
34#define SMC_LGR_NUM_INCR 256
35#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
36#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
37
38static struct smc_lgr_list smc_lgr_list = { /* established link groups */
39 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
40 .list = LIST_HEAD_INIT(smc_lgr_list.list),
41 .num = 0,
42};
43
44static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
45static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
46
47static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
48 struct smc_buf_desc *buf_desc);
49static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
50
51static void smc_link_down_work(struct work_struct *work);
52
53/* return head of link group list and its lock for a given link group */
54static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
55 spinlock_t **lgr_lock)
56{
57 if (lgr->is_smcd) {
58 *lgr_lock = &lgr->smcd->lgr_lock;
59 return &lgr->smcd->lgr_list;
60 }
61
62 *lgr_lock = &smc_lgr_list.lock;
63 return &smc_lgr_list.list;
64}
65
66static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
67{
68 /* client link group creation always follows the server link group
69 * creation. For client use a somewhat higher removal delay time,
70 * otherwise there is a risk of out-of-sync link groups.
71 */
72 if (!lgr->freeing) {
73 mod_delayed_work(system_wq, &lgr->free_work,
74 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
75 SMC_LGR_FREE_DELAY_CLNT :
76 SMC_LGR_FREE_DELAY_SERV);
77 }
78}
79
80/* Register connection's alert token in our lookup structure.
81 * To use rbtrees we have to implement our own insert core.
82 * Requires @conns_lock
83 * @smc connection to register
84 * Returns 0 on success, != otherwise.
85 */
86static void smc_lgr_add_alert_token(struct smc_connection *conn)
87{
88 struct rb_node **link, *parent = NULL;
89 u32 token = conn->alert_token_local;
90
91 link = &conn->lgr->conns_all.rb_node;
92 while (*link) {
93 struct smc_connection *cur = rb_entry(*link,
94 struct smc_connection, alert_node);
95
96 parent = *link;
97 if (cur->alert_token_local > token)
98 link = &parent->rb_left;
99 else
100 link = &parent->rb_right;
101 }
102 /* Put the new node there */
103 rb_link_node(&conn->alert_node, parent, link);
104 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
105}
106
107/* assign an SMC-R link to the connection */
108static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
109{
110 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
111 SMC_LNK_ACTIVE;
112 int i, j;
113
114 /* do link balancing */
115 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
116 struct smc_link *lnk = &conn->lgr->lnk[i];
117
118 if (lnk->state != expected || lnk->link_is_asym)
119 continue;
120 if (conn->lgr->role == SMC_CLNT) {
121 conn->lnk = lnk; /* temporary, SMC server assigns link*/
122 break;
123 }
124 if (conn->lgr->conns_num % 2) {
125 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
126 struct smc_link *lnk2;
127
128 lnk2 = &conn->lgr->lnk[j];
129 if (lnk2->state == expected &&
130 !lnk2->link_is_asym) {
131 conn->lnk = lnk2;
132 break;
133 }
134 }
135 }
136 if (!conn->lnk)
137 conn->lnk = lnk;
138 break;
139 }
140 if (!conn->lnk)
141 return SMC_CLC_DECL_NOACTLINK;
142 return 0;
143}
144
145/* Register connection in link group by assigning an alert token
146 * registered in a search tree.
147 * Requires @conns_lock
148 * Note that '0' is a reserved value and not assigned.
149 */
150static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
151{
152 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
153 static atomic_t nexttoken = ATOMIC_INIT(0);
154 int rc;
155
156 if (!conn->lgr->is_smcd) {
157 rc = smcr_lgr_conn_assign_link(conn, first);
158 if (rc)
159 return rc;
160 }
161 /* find a new alert_token_local value not yet used by some connection
162 * in this link group
163 */
164 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
165 while (!conn->alert_token_local) {
166 conn->alert_token_local = atomic_inc_return(&nexttoken);
167 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
168 conn->alert_token_local = 0;
169 }
170 smc_lgr_add_alert_token(conn);
171 conn->lgr->conns_num++;
172 return 0;
173}
174
175/* Unregister connection and reset the alert token of the given connection<
176 */
177static void __smc_lgr_unregister_conn(struct smc_connection *conn)
178{
179 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
180 struct smc_link_group *lgr = conn->lgr;
181
182 rb_erase(&conn->alert_node, &lgr->conns_all);
183 lgr->conns_num--;
184 conn->alert_token_local = 0;
185 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
186}
187
188/* Unregister connection from lgr
189 */
190static void smc_lgr_unregister_conn(struct smc_connection *conn)
191{
192 struct smc_link_group *lgr = conn->lgr;
193
194 if (!lgr)
195 return;
196 write_lock_bh(&lgr->conns_lock);
197 if (conn->alert_token_local) {
198 __smc_lgr_unregister_conn(conn);
199 }
200 write_unlock_bh(&lgr->conns_lock);
201 conn->lgr = NULL;
202}
203
204void smc_lgr_cleanup_early(struct smc_connection *conn)
205{
206 struct smc_link_group *lgr = conn->lgr;
207 spinlock_t *lgr_lock;
208
209 if (!lgr)
210 return;
211
212 smc_conn_free(conn);
213 smc_lgr_list_head(lgr, &lgr_lock);
214 spin_lock_bh(lgr_lock);
215 /* do not use this link group for new connections */
216 if (!list_empty(&lgr->list))
217 list_del_init(&lgr->list);
218 spin_unlock_bh(lgr_lock);
219 __smc_lgr_terminate(lgr, true);
220}
221
222static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
223{
224 int i;
225
226 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
227 struct smc_link *lnk = &lgr->lnk[i];
228
229 if (smc_link_sendable(lnk))
230 lnk->state = SMC_LNK_INACTIVE;
231 }
232 wake_up_all(&lgr->llc_msg_waiter);
233 wake_up_all(&lgr->llc_flow_waiter);
234}
235
236static void smc_lgr_free(struct smc_link_group *lgr);
237
238static void smc_lgr_free_work(struct work_struct *work)
239{
240 struct smc_link_group *lgr = container_of(to_delayed_work(work),
241 struct smc_link_group,
242 free_work);
243 spinlock_t *lgr_lock;
244 bool conns;
245
246 smc_lgr_list_head(lgr, &lgr_lock);
247 spin_lock_bh(lgr_lock);
248 if (lgr->freeing) {
249 spin_unlock_bh(lgr_lock);
250 return;
251 }
252 read_lock_bh(&lgr->conns_lock);
253 conns = RB_EMPTY_ROOT(&lgr->conns_all);
254 read_unlock_bh(&lgr->conns_lock);
255 if (!conns) { /* number of lgr connections is no longer zero */
256 spin_unlock_bh(lgr_lock);
257 return;
258 }
259 list_del_init(&lgr->list); /* remove from smc_lgr_list */
260 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
261 spin_unlock_bh(lgr_lock);
262 cancel_delayed_work(&lgr->free_work);
263
264 if (!lgr->is_smcd && !lgr->terminating)
265 smc_llc_send_link_delete_all(lgr, true,
266 SMC_LLC_DEL_PROG_INIT_TERM);
267 if (lgr->is_smcd && !lgr->terminating)
268 smc_ism_signal_shutdown(lgr);
269 if (!lgr->is_smcd)
270 smcr_lgr_link_deactivate_all(lgr);
271 smc_lgr_free(lgr);
272}
273
274static void smc_lgr_terminate_work(struct work_struct *work)
275{
276 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
277 terminate_work);
278
279 __smc_lgr_terminate(lgr, true);
280}
281
282/* return next unique link id for the lgr */
283static u8 smcr_next_link_id(struct smc_link_group *lgr)
284{
285 u8 link_id;
286 int i;
287
288 while (1) {
289again:
290 link_id = ++lgr->next_link_id;
291 if (!link_id) /* skip zero as link_id */
292 link_id = ++lgr->next_link_id;
293 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
294 if (smc_link_usable(&lgr->lnk[i]) &&
295 lgr->lnk[i].link_id == link_id)
296 goto again;
297 }
298 break;
299 }
300 return link_id;
301}
302
303int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
304 u8 link_idx, struct smc_init_info *ini)
305{
306 u8 rndvec[3];
307 int rc;
308
309 get_device(&ini->ib_dev->ibdev->dev);
310 atomic_inc(&ini->ib_dev->lnk_cnt);
311 lnk->link_id = smcr_next_link_id(lgr);
312 lnk->lgr = lgr;
313 lnk->link_idx = link_idx;
314 lnk->smcibdev = ini->ib_dev;
315 lnk->ibport = ini->ib_port;
316 lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
317 smc_llc_link_set_uid(lnk);
318 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
319 if (!ini->ib_dev->initialized) {
320 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
321 if (rc)
322 goto out;
323 }
324 get_random_bytes(rndvec, sizeof(rndvec));
325 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
326 (rndvec[2] << 16);
327 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
328 ini->vlan_id, lnk->gid, &lnk->sgid_index);
329 if (rc)
330 goto out;
331 rc = smc_llc_link_init(lnk);
332 if (rc)
333 goto out;
334 rc = smc_wr_alloc_link_mem(lnk);
335 if (rc)
336 goto clear_llc_lnk;
337 rc = smc_ib_create_protection_domain(lnk);
338 if (rc)
339 goto free_link_mem;
340 rc = smc_ib_create_queue_pair(lnk);
341 if (rc)
342 goto dealloc_pd;
343 rc = smc_wr_create_link(lnk);
344 if (rc)
345 goto destroy_qp;
346 lnk->state = SMC_LNK_ACTIVATING;
347 return 0;
348
349destroy_qp:
350 smc_ib_destroy_queue_pair(lnk);
351dealloc_pd:
352 smc_ib_dealloc_protection_domain(lnk);
353free_link_mem:
354 smc_wr_free_link_mem(lnk);
355clear_llc_lnk:
356 smc_llc_link_clear(lnk, false);
357out:
358 put_device(&ini->ib_dev->ibdev->dev);
359 memset(lnk, 0, sizeof(struct smc_link));
360 lnk->state = SMC_LNK_UNUSED;
361 if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
362 wake_up(&ini->ib_dev->lnks_deleted);
363 return rc;
364}
365
366/* create a new SMC link group */
367static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
368{
369 struct smc_link_group *lgr;
370 struct list_head *lgr_list;
371 struct smc_link *lnk;
372 spinlock_t *lgr_lock;
373 u8 link_idx;
374 int rc = 0;
375 int i;
376
377 if (ini->is_smcd && ini->vlan_id) {
378 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
379 ini->vlan_id)) {
380 rc = SMC_CLC_DECL_ISMVLANERR;
381 goto out;
382 }
383 }
384
385 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
386 if (!lgr) {
387 rc = SMC_CLC_DECL_MEM;
388 goto ism_put_vlan;
389 }
390 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
391 SMC_LGR_ID_SIZE, &lgr->id);
392 if (!lgr->tx_wq) {
393 rc = -ENOMEM;
394 goto free_lgr;
395 }
396 lgr->is_smcd = ini->is_smcd;
397 lgr->sync_err = 0;
398 lgr->terminating = 0;
399 lgr->freeing = 0;
400 lgr->vlan_id = ini->vlan_id;
401 mutex_init(&lgr->sndbufs_lock);
402 mutex_init(&lgr->rmbs_lock);
403 rwlock_init(&lgr->conns_lock);
404 for (i = 0; i < SMC_RMBE_SIZES; i++) {
405 INIT_LIST_HEAD(&lgr->sndbufs[i]);
406 INIT_LIST_HEAD(&lgr->rmbs[i]);
407 }
408 lgr->next_link_id = 0;
409 smc_lgr_list.num += SMC_LGR_NUM_INCR;
410 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
411 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
412 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
413 lgr->conns_all = RB_ROOT;
414 if (ini->is_smcd) {
415 /* SMC-D specific settings */
416 get_device(&ini->ism_dev[ini->ism_selected]->dev);
417 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
418 lgr->smcd = ini->ism_dev[ini->ism_selected];
419 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
420 lgr_lock = &lgr->smcd->lgr_lock;
421 lgr->smc_version = ini->smcd_version;
422 lgr->peer_shutdown = 0;
423 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
424 } else {
425 /* SMC-R specific settings */
426 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
427 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
428 SMC_SYSTEMID_LEN);
429 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
430 SMC_MAX_PNETID_LEN);
431 smc_llc_lgr_init(lgr, smc);
432
433 link_idx = SMC_SINGLE_LINK;
434 lnk = &lgr->lnk[link_idx];
435 rc = smcr_link_init(lgr, lnk, link_idx, ini);
436 if (rc)
437 goto free_wq;
438 lgr_list = &smc_lgr_list.list;
439 lgr_lock = &smc_lgr_list.lock;
440 atomic_inc(&lgr_cnt);
441 }
442 smc->conn.lgr = lgr;
443 spin_lock_bh(lgr_lock);
444 list_add_tail(&lgr->list, lgr_list);
445 spin_unlock_bh(lgr_lock);
446 return 0;
447
448free_wq:
449 destroy_workqueue(lgr->tx_wq);
450free_lgr:
451 kfree(lgr);
452ism_put_vlan:
453 if (ini->is_smcd && ini->vlan_id)
454 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
455out:
456 if (rc < 0) {
457 if (rc == -ENOMEM)
458 rc = SMC_CLC_DECL_MEM;
459 else
460 rc = SMC_CLC_DECL_INTERR;
461 }
462 return rc;
463}
464
465static int smc_write_space(struct smc_connection *conn)
466{
467 int buffer_len = conn->peer_rmbe_size;
468 union smc_host_cursor prod;
469 union smc_host_cursor cons;
470 int space;
471
472 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
473 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
474 /* determine rx_buf space */
475 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
476 return space;
477}
478
479static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
480 struct smc_wr_buf *wr_buf)
481{
482 struct smc_connection *conn = &smc->conn;
483 union smc_host_cursor cons, fin;
484 int rc = 0;
485 int diff;
486
487 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
488 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
489 /* set prod cursor to old state, enforce tx_rdma_writes() */
490 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
491 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
492
493 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
494 /* cons cursor advanced more than fin, and prod was set
495 * fin above, so now prod is smaller than cons. Fix that.
496 */
497 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
498 smc_curs_add(conn->sndbuf_desc->len,
499 &conn->tx_curs_sent, diff);
500 smc_curs_add(conn->sndbuf_desc->len,
501 &conn->tx_curs_fin, diff);
502
503 smp_mb__before_atomic();
504 atomic_add(diff, &conn->sndbuf_space);
505 smp_mb__after_atomic();
506
507 smc_curs_add(conn->peer_rmbe_size,
508 &conn->local_tx_ctrl.prod, diff);
509 smc_curs_add(conn->peer_rmbe_size,
510 &conn->local_tx_ctrl_fin, diff);
511 }
512 /* recalculate, value is used by tx_rdma_writes() */
513 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
514
515 if (smc->sk.sk_state != SMC_INIT &&
516 smc->sk.sk_state != SMC_CLOSED) {
517 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
518 if (!rc) {
519 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
520 smc->sk.sk_data_ready(&smc->sk);
521 }
522 } else {
523 smc_wr_tx_put_slot(conn->lnk,
524 (struct smc_wr_tx_pend_priv *)pend);
525 }
526 return rc;
527}
528
529struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
530 struct smc_link *from_lnk, bool is_dev_err)
531{
532 struct smc_link *to_lnk = NULL;
533 struct smc_cdc_tx_pend *pend;
534 struct smc_connection *conn;
535 struct smc_wr_buf *wr_buf;
536 struct smc_sock *smc;
537 struct rb_node *node;
538 int i, rc = 0;
539
540 /* link is inactive, wake up tx waiters */
541 smc_wr_wakeup_tx_wait(from_lnk);
542
543 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
544 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
545 continue;
546 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
547 from_lnk->ibport == lgr->lnk[i].ibport) {
548 continue;
549 }
550 to_lnk = &lgr->lnk[i];
551 break;
552 }
553 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) {
554 smc_lgr_terminate_sched(lgr);
555 return NULL;
556 }
557again:
558 read_lock_bh(&lgr->conns_lock);
559 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
560 conn = rb_entry(node, struct smc_connection, alert_node);
561 if (conn->lnk != from_lnk)
562 continue;
563 smc = container_of(conn, struct smc_sock, conn);
564 /* conn->lnk not yet set in SMC_INIT state */
565 if (smc->sk.sk_state == SMC_INIT)
566 continue;
567 if (smc->sk.sk_state == SMC_CLOSED ||
568 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
569 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
570 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
571 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
572 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
573 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
574 smc->sk.sk_state == SMC_PEERABORTWAIT ||
575 smc->sk.sk_state == SMC_PROCESSABORT) {
576 spin_lock_bh(&conn->send_lock);
577 conn->lnk = to_lnk;
578 spin_unlock_bh(&conn->send_lock);
579 continue;
580 }
581 sock_hold(&smc->sk);
582 read_unlock_bh(&lgr->conns_lock);
583 /* pre-fetch buffer outside of send_lock, might sleep */
584 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
585 if (rc)
586 goto err_out;
587 /* avoid race with smcr_tx_sndbuf_nonempty() */
588 spin_lock_bh(&conn->send_lock);
589 conn->lnk = to_lnk;
590 rc = smc_switch_cursor(smc, pend, wr_buf);
591 spin_unlock_bh(&conn->send_lock);
592 sock_put(&smc->sk);
593 if (rc)
594 goto err_out;
595 goto again;
596 }
597 read_unlock_bh(&lgr->conns_lock);
598 smc_wr_tx_link_put(to_lnk);
599 return to_lnk;
600
601err_out:
602 smcr_link_down_cond_sched(to_lnk);
603 smc_wr_tx_link_put(to_lnk);
604 return NULL;
605}
606
607static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
608 struct smc_link_group *lgr)
609{
610 int rc;
611
612 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
613 /* unregister rmb with peer */
614 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
615 if (!rc) {
616 /* protect against smc_llc_cli_rkey_exchange() */
617 mutex_lock(&lgr->llc_conf_mutex);
618 smc_llc_do_delete_rkey(lgr, rmb_desc);
619 rmb_desc->is_conf_rkey = false;
620 mutex_unlock(&lgr->llc_conf_mutex);
621 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
622 }
623 }
624
625 if (rmb_desc->is_reg_err) {
626 /* buf registration failed, reuse not possible */
627 mutex_lock(&lgr->rmbs_lock);
628 list_del(&rmb_desc->list);
629 mutex_unlock(&lgr->rmbs_lock);
630
631 smc_buf_free(lgr, true, rmb_desc);
632 } else {
633 rmb_desc->used = 0;
634 }
635}
636
637static void smc_buf_unuse(struct smc_connection *conn,
638 struct smc_link_group *lgr)
639{
640 if (conn->sndbuf_desc)
641 conn->sndbuf_desc->used = 0;
642 if (conn->rmb_desc && lgr->is_smcd)
643 conn->rmb_desc->used = 0;
644 else if (conn->rmb_desc)
645 smcr_buf_unuse(conn->rmb_desc, lgr);
646}
647
648/* remove a finished connection from its link group */
649void smc_conn_free(struct smc_connection *conn)
650{
651 struct smc_link_group *lgr = conn->lgr;
652
653 if (!lgr)
654 return;
655 if (lgr->is_smcd) {
656 if (!list_empty(&lgr->list))
657 smc_ism_unset_conn(conn);
658 tasklet_kill(&conn->rx_tsklet);
659 } else {
660 smc_cdc_wait_pend_tx_wr(conn);
661 if (current_work() != &conn->abort_work)
662 cancel_work_sync(&conn->abort_work);
663 }
664 if (!list_empty(&lgr->list)) {
665 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
666 smc_lgr_unregister_conn(conn);
667 }
668
669 if (!lgr->conns_num)
670 smc_lgr_schedule_free_work(lgr);
671}
672
673/* unregister a link from a buf_desc */
674static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
675 struct smc_link *lnk)
676{
677 if (is_rmb)
678 buf_desc->is_reg_mr[lnk->link_idx] = false;
679 if (!buf_desc->is_map_ib[lnk->link_idx])
680 return;
681 if (is_rmb) {
682 if (buf_desc->mr_rx[lnk->link_idx]) {
683 smc_ib_put_memory_region(
684 buf_desc->mr_rx[lnk->link_idx]);
685 buf_desc->mr_rx[lnk->link_idx] = NULL;
686 }
687 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
688 } else {
689 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
690 }
691 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
692 buf_desc->is_map_ib[lnk->link_idx] = false;
693}
694
695/* unmap all buffers of lgr for a deleted link */
696static void smcr_buf_unmap_lgr(struct smc_link *lnk)
697{
698 struct smc_link_group *lgr = lnk->lgr;
699 struct smc_buf_desc *buf_desc, *bf;
700 int i;
701
702 for (i = 0; i < SMC_RMBE_SIZES; i++) {
703 mutex_lock(&lgr->rmbs_lock);
704 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
705 smcr_buf_unmap_link(buf_desc, true, lnk);
706 mutex_unlock(&lgr->rmbs_lock);
707 mutex_lock(&lgr->sndbufs_lock);
708 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
709 list)
710 smcr_buf_unmap_link(buf_desc, false, lnk);
711 mutex_unlock(&lgr->sndbufs_lock);
712 }
713}
714
715static void smcr_rtoken_clear_link(struct smc_link *lnk)
716{
717 struct smc_link_group *lgr = lnk->lgr;
718 int i;
719
720 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
721 lgr->rtokens[i][lnk->link_idx].rkey = 0;
722 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
723 }
724}
725
726/* must be called under lgr->llc_conf_mutex lock */
727void smcr_link_clear(struct smc_link *lnk, bool log)
728{
729 struct smc_ib_device *smcibdev;
730
731 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
732 return;
733 lnk->peer_qpn = 0;
734 smc_llc_link_clear(lnk, log);
735 smcr_buf_unmap_lgr(lnk);
736 smcr_rtoken_clear_link(lnk);
737 smc_ib_modify_qp_error(lnk);
738 smc_wr_free_link(lnk);
739 smc_ib_destroy_queue_pair(lnk);
740 smc_ib_dealloc_protection_domain(lnk);
741 smc_wr_free_link_mem(lnk);
742 put_device(&lnk->smcibdev->ibdev->dev);
743 smcibdev = lnk->smcibdev;
744 memset(lnk, 0, sizeof(struct smc_link));
745 lnk->state = SMC_LNK_UNUSED;
746 if (!atomic_dec_return(&smcibdev->lnk_cnt))
747 wake_up(&smcibdev->lnks_deleted);
748}
749
750static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
751 struct smc_buf_desc *buf_desc)
752{
753 int i;
754
755 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
756 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
757
758 if (buf_desc->pages)
759 __free_pages(buf_desc->pages, buf_desc->order);
760 kfree(buf_desc);
761}
762
763static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
764 struct smc_buf_desc *buf_desc)
765{
766 if (is_dmb) {
767 /* restore original buf len */
768 buf_desc->len += sizeof(struct smcd_cdc_msg);
769 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
770 } else {
771 kfree(buf_desc->cpu_addr);
772 }
773 kfree(buf_desc);
774}
775
776static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
777 struct smc_buf_desc *buf_desc)
778{
779 if (lgr->is_smcd)
780 smcd_buf_free(lgr, is_rmb, buf_desc);
781 else
782 smcr_buf_free(lgr, is_rmb, buf_desc);
783}
784
785static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
786{
787 struct smc_buf_desc *buf_desc, *bf_desc;
788 struct list_head *buf_list;
789 int i;
790
791 for (i = 0; i < SMC_RMBE_SIZES; i++) {
792 if (is_rmb)
793 buf_list = &lgr->rmbs[i];
794 else
795 buf_list = &lgr->sndbufs[i];
796 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
797 list) {
798 list_del(&buf_desc->list);
799 smc_buf_free(lgr, is_rmb, buf_desc);
800 }
801 }
802}
803
804static void smc_lgr_free_bufs(struct smc_link_group *lgr)
805{
806 /* free send buffers */
807 __smc_lgr_free_bufs(lgr, false);
808 /* free rmbs */
809 __smc_lgr_free_bufs(lgr, true);
810}
811
812/* remove a link group */
813static void smc_lgr_free(struct smc_link_group *lgr)
814{
815 int i;
816
817 if (!lgr->is_smcd) {
818 mutex_lock(&lgr->llc_conf_mutex);
819 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
820 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
821 smcr_link_clear(&lgr->lnk[i], false);
822 }
823 mutex_unlock(&lgr->llc_conf_mutex);
824 smc_llc_lgr_clear(lgr);
825 }
826
827 smc_lgr_free_bufs(lgr);
828 destroy_workqueue(lgr->tx_wq);
829 if (lgr->is_smcd) {
830 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
831 put_device(&lgr->smcd->dev);
832 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
833 wake_up(&lgr->smcd->lgrs_deleted);
834 } else {
835 if (!atomic_dec_return(&lgr_cnt))
836 wake_up(&lgrs_deleted);
837 }
838 kfree(lgr);
839}
840
841static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
842{
843 int i;
844
845 for (i = 0; i < SMC_RMBE_SIZES; i++) {
846 struct smc_buf_desc *buf_desc;
847
848 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
849 buf_desc->len += sizeof(struct smcd_cdc_msg);
850 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
851 }
852 }
853}
854
855static void smc_sk_wake_ups(struct smc_sock *smc)
856{
857 smc->sk.sk_write_space(&smc->sk);
858 smc->sk.sk_data_ready(&smc->sk);
859 smc->sk.sk_state_change(&smc->sk);
860}
861
862/* kill a connection */
863static void smc_conn_kill(struct smc_connection *conn, bool soft)
864{
865 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
866
867 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
868 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
869 else
870 smc_close_abort(conn);
871 conn->killed = 1;
872 smc->sk.sk_err = ECONNABORTED;
873 smc_sk_wake_ups(smc);
874 if (conn->lgr->is_smcd) {
875 smc_ism_unset_conn(conn);
876 if (soft)
877 tasklet_kill(&conn->rx_tsklet);
878 else
879 tasklet_unlock_wait(&conn->rx_tsklet);
880 } else {
881 smc_cdc_wait_pend_tx_wr(conn);
882 }
883 smc_lgr_unregister_conn(conn);
884 smc_close_active_abort(smc);
885}
886
887static void smc_lgr_cleanup(struct smc_link_group *lgr)
888{
889 if (lgr->is_smcd) {
890 smc_ism_signal_shutdown(lgr);
891 smcd_unregister_all_dmbs(lgr);
892 } else {
893 u32 rsn = lgr->llc_termination_rsn;
894
895 if (!rsn)
896 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
897 smc_llc_send_link_delete_all(lgr, false, rsn);
898 smcr_lgr_link_deactivate_all(lgr);
899 }
900}
901
902/* terminate link group
903 * @soft: true if link group shutdown can take its time
904 * false if immediate link group shutdown is required
905 */
906static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
907{
908 struct smc_connection *conn;
909 struct smc_sock *smc;
910 struct rb_node *node;
911
912 if (lgr->terminating)
913 return; /* lgr already terminating */
914 /* cancel free_work sync, will terminate when lgr->freeing is set */
915 cancel_delayed_work_sync(&lgr->free_work);
916 lgr->terminating = 1;
917
918 /* kill remaining link group connections */
919 read_lock_bh(&lgr->conns_lock);
920 node = rb_first(&lgr->conns_all);
921 while (node) {
922 read_unlock_bh(&lgr->conns_lock);
923 conn = rb_entry(node, struct smc_connection, alert_node);
924 smc = container_of(conn, struct smc_sock, conn);
925 sock_hold(&smc->sk); /* sock_put below */
926 lock_sock(&smc->sk);
927 smc_conn_kill(conn, soft);
928 release_sock(&smc->sk);
929 sock_put(&smc->sk); /* sock_hold above */
930 read_lock_bh(&lgr->conns_lock);
931 node = rb_first(&lgr->conns_all);
932 }
933 read_unlock_bh(&lgr->conns_lock);
934 smc_lgr_cleanup(lgr);
935 smc_lgr_free(lgr);
936}
937
938/* unlink link group and schedule termination */
939void smc_lgr_terminate_sched(struct smc_link_group *lgr)
940{
941 spinlock_t *lgr_lock;
942
943 smc_lgr_list_head(lgr, &lgr_lock);
944 spin_lock_bh(lgr_lock);
945 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
946 spin_unlock_bh(lgr_lock);
947 return; /* lgr already terminating */
948 }
949 list_del_init(&lgr->list);
950 lgr->freeing = 1;
951 spin_unlock_bh(lgr_lock);
952 schedule_work(&lgr->terminate_work);
953}
954
955/* Called when peer lgr shutdown (regularly or abnormally) is received */
956void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
957{
958 struct smc_link_group *lgr, *l;
959 LIST_HEAD(lgr_free_list);
960
961 /* run common cleanup function and build free list */
962 spin_lock_bh(&dev->lgr_lock);
963 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
964 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
965 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
966 if (peer_gid) /* peer triggered termination */
967 lgr->peer_shutdown = 1;
968 list_move(&lgr->list, &lgr_free_list);
969 lgr->freeing = 1;
970 }
971 }
972 spin_unlock_bh(&dev->lgr_lock);
973
974 /* cancel the regular free workers and actually free lgrs */
975 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
976 list_del_init(&lgr->list);
977 schedule_work(&lgr->terminate_work);
978 }
979}
980
981/* Called when an SMCD device is removed or the smc module is unloaded */
982void smc_smcd_terminate_all(struct smcd_dev *smcd)
983{
984 struct smc_link_group *lgr, *lg;
985 LIST_HEAD(lgr_free_list);
986
987 spin_lock_bh(&smcd->lgr_lock);
988 list_splice_init(&smcd->lgr_list, &lgr_free_list);
989 list_for_each_entry(lgr, &lgr_free_list, list)
990 lgr->freeing = 1;
991 spin_unlock_bh(&smcd->lgr_lock);
992
993 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
994 list_del_init(&lgr->list);
995 __smc_lgr_terminate(lgr, false);
996 }
997
998 if (atomic_read(&smcd->lgr_cnt))
999 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1000}
1001
1002/* Called when an SMCR device is removed or the smc module is unloaded.
1003 * If smcibdev is given, all SMCR link groups using this device are terminated.
1004 * If smcibdev is NULL, all SMCR link groups are terminated.
1005 */
1006void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1007{
1008 struct smc_link_group *lgr, *lg;
1009 LIST_HEAD(lgr_free_list);
1010 int i;
1011
1012 spin_lock_bh(&smc_lgr_list.lock);
1013 if (!smcibdev) {
1014 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1015 list_for_each_entry(lgr, &lgr_free_list, list)
1016 lgr->freeing = 1;
1017 } else {
1018 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1019 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1020 if (lgr->lnk[i].smcibdev == smcibdev)
1021 smcr_link_down_cond_sched(&lgr->lnk[i]);
1022 }
1023 }
1024 }
1025 spin_unlock_bh(&smc_lgr_list.lock);
1026
1027 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1028 list_del_init(&lgr->list);
1029 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1030 __smc_lgr_terminate(lgr, false);
1031 }
1032
1033 if (smcibdev) {
1034 if (atomic_read(&smcibdev->lnk_cnt))
1035 wait_event(smcibdev->lnks_deleted,
1036 !atomic_read(&smcibdev->lnk_cnt));
1037 } else {
1038 if (atomic_read(&lgr_cnt))
1039 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1040 }
1041}
1042
1043/* set new lgr type and clear all asymmetric link tagging */
1044void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1045{
1046 char *lgr_type = "";
1047 int i;
1048
1049 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1050 if (smc_link_usable(&lgr->lnk[i]))
1051 lgr->lnk[i].link_is_asym = false;
1052 if (lgr->type == new_type)
1053 return;
1054 lgr->type = new_type;
1055
1056 switch (lgr->type) {
1057 case SMC_LGR_NONE:
1058 lgr_type = "NONE";
1059 break;
1060 case SMC_LGR_SINGLE:
1061 lgr_type = "SINGLE";
1062 break;
1063 case SMC_LGR_SYMMETRIC:
1064 lgr_type = "SYMMETRIC";
1065 break;
1066 case SMC_LGR_ASYMMETRIC_PEER:
1067 lgr_type = "ASYMMETRIC_PEER";
1068 break;
1069 case SMC_LGR_ASYMMETRIC_LOCAL:
1070 lgr_type = "ASYMMETRIC_LOCAL";
1071 break;
1072 }
1073 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1074 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1075 lgr_type, lgr->pnet_id);
1076}
1077
1078/* set new lgr type and tag a link as asymmetric */
1079void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1080 enum smc_lgr_type new_type, int asym_lnk_idx)
1081{
1082 smcr_lgr_set_type(lgr, new_type);
1083 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1084}
1085
1086/* abort connection, abort_work scheduled from tasklet context */
1087static void smc_conn_abort_work(struct work_struct *work)
1088{
1089 struct smc_connection *conn = container_of(work,
1090 struct smc_connection,
1091 abort_work);
1092 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1093
1094 lock_sock(&smc->sk);
1095 smc_conn_kill(conn, true);
1096 release_sock(&smc->sk);
1097 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1098}
1099
1100void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1101{
1102 struct smc_link_group *lgr, *n;
1103
1104 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1105 struct smc_link *link;
1106
1107 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1108 SMC_MAX_PNETID_LEN) ||
1109 lgr->type == SMC_LGR_SYMMETRIC ||
1110 lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1111 continue;
1112
1113 /* trigger local add link processing */
1114 link = smc_llc_usable_link(lgr);
1115 if (link)
1116 smc_llc_add_link_local(link);
1117 }
1118}
1119
1120/* link is down - switch connections to alternate link,
1121 * must be called under lgr->llc_conf_mutex lock
1122 */
1123static void smcr_link_down(struct smc_link *lnk)
1124{
1125 struct smc_link_group *lgr = lnk->lgr;
1126 struct smc_link *to_lnk;
1127 int del_link_id;
1128
1129 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1130 return;
1131
1132 to_lnk = smc_switch_conns(lgr, lnk, true);
1133 if (!to_lnk) { /* no backup link available */
1134 smcr_link_clear(lnk, true);
1135 return;
1136 }
1137 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1138 del_link_id = lnk->link_id;
1139
1140 if (lgr->role == SMC_SERV) {
1141 /* trigger local delete link processing */
1142 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1143 } else {
1144 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1145 /* another llc task is ongoing */
1146 mutex_unlock(&lgr->llc_conf_mutex);
1147 wait_event_timeout(lgr->llc_flow_waiter,
1148 (list_empty(&lgr->list) ||
1149 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1150 SMC_LLC_WAIT_TIME);
1151 mutex_lock(&lgr->llc_conf_mutex);
1152 }
1153 if (!list_empty(&lgr->list)) {
1154 smc_llc_send_delete_link(to_lnk, del_link_id,
1155 SMC_LLC_REQ, true,
1156 SMC_LLC_DEL_LOST_PATH);
1157 smcr_link_clear(lnk, true);
1158 }
1159 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1160 }
1161}
1162
1163/* must be called under lgr->llc_conf_mutex lock */
1164void smcr_link_down_cond(struct smc_link *lnk)
1165{
1166 if (smc_link_downing(&lnk->state))
1167 smcr_link_down(lnk);
1168}
1169
1170/* will get the lgr->llc_conf_mutex lock */
1171void smcr_link_down_cond_sched(struct smc_link *lnk)
1172{
1173 if (smc_link_downing(&lnk->state))
1174 schedule_work(&lnk->link_down_wrk);
1175}
1176
1177void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1178{
1179 struct smc_link_group *lgr, *n;
1180 int i;
1181
1182 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1183 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1184 SMC_MAX_PNETID_LEN))
1185 continue; /* lgr is not affected */
1186 if (list_empty(&lgr->list))
1187 continue;
1188 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1189 struct smc_link *lnk = &lgr->lnk[i];
1190
1191 if (smc_link_usable(lnk) &&
1192 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1193 smcr_link_down_cond_sched(lnk);
1194 }
1195 }
1196}
1197
1198static void smc_link_down_work(struct work_struct *work)
1199{
1200 struct smc_link *link = container_of(work, struct smc_link,
1201 link_down_wrk);
1202 struct smc_link_group *lgr = link->lgr;
1203
1204 if (list_empty(&lgr->list))
1205 return;
1206 wake_up_all(&lgr->llc_msg_waiter);
1207 mutex_lock(&lgr->llc_conf_mutex);
1208 smcr_link_down(link);
1209 mutex_unlock(&lgr->llc_conf_mutex);
1210}
1211
1212static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
1213 struct netdev_nested_priv *priv)
1214{
1215 unsigned short *vlan_id = (unsigned short *)priv->data;
1216
1217 if (is_vlan_dev(lower_dev)) {
1218 *vlan_id = vlan_dev_vlan_id(lower_dev);
1219 return 1;
1220 }
1221
1222 return 0;
1223}
1224
1225/* Determine vlan of internal TCP socket. */
1226int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1227{
1228 struct dst_entry *dst = sk_dst_get(clcsock->sk);
1229 struct netdev_nested_priv priv;
1230 struct net_device *ndev;
1231 int rc = 0;
1232
1233 ini->vlan_id = 0;
1234 if (!dst) {
1235 rc = -ENOTCONN;
1236 goto out;
1237 }
1238 if (!dst->dev) {
1239 rc = -ENODEV;
1240 goto out_rel;
1241 }
1242
1243 ndev = dst->dev;
1244 if (is_vlan_dev(ndev)) {
1245 ini->vlan_id = vlan_dev_vlan_id(ndev);
1246 goto out_rel;
1247 }
1248
1249 priv.data = (void *)&ini->vlan_id;
1250 rtnl_lock();
1251 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
1252 rtnl_unlock();
1253
1254out_rel:
1255 dst_release(dst);
1256out:
1257 return rc;
1258}
1259
1260static bool smcr_lgr_match(struct smc_link_group *lgr,
1261 struct smc_clc_msg_local *lcl,
1262 enum smc_lgr_role role, u32 clcqpn)
1263{
1264 int i;
1265
1266 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1267 lgr->role != role)
1268 return false;
1269
1270 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1271 if (!smc_link_active(&lgr->lnk[i]))
1272 continue;
1273 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1274 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1275 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1276 return true;
1277 }
1278 return false;
1279}
1280
1281static bool smcd_lgr_match(struct smc_link_group *lgr,
1282 struct smcd_dev *smcismdev, u64 peer_gid)
1283{
1284 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1285}
1286
1287/* create a new SMC connection (and a new link group if necessary) */
1288int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1289{
1290 struct smc_connection *conn = &smc->conn;
1291 struct list_head *lgr_list;
1292 struct smc_link_group *lgr;
1293 enum smc_lgr_role role;
1294 spinlock_t *lgr_lock;
1295 int rc = 0;
1296
1297 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1298 &smc_lgr_list.list;
1299 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1300 &smc_lgr_list.lock;
1301 ini->first_contact_local = 1;
1302 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1303 if (role == SMC_CLNT && ini->first_contact_peer)
1304 /* create new link group as well */
1305 goto create;
1306
1307 /* determine if an existing link group can be reused */
1308 spin_lock_bh(lgr_lock);
1309 list_for_each_entry(lgr, lgr_list, list) {
1310 write_lock_bh(&lgr->conns_lock);
1311 if ((ini->is_smcd ?
1312 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1313 ini->ism_peer_gid[ini->ism_selected]) :
1314 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1315 !lgr->sync_err &&
1316 (ini->smcd_version == SMC_V2 ||
1317 lgr->vlan_id == ini->vlan_id) &&
1318 (role == SMC_CLNT || ini->is_smcd ||
1319 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX &&
1320 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
1321 /* link group found */
1322 ini->first_contact_local = 0;
1323 conn->lgr = lgr;
1324 rc = smc_lgr_register_conn(conn, false);
1325 write_unlock_bh(&lgr->conns_lock);
1326 if (!rc && delayed_work_pending(&lgr->free_work))
1327 cancel_delayed_work(&lgr->free_work);
1328 break;
1329 }
1330 write_unlock_bh(&lgr->conns_lock);
1331 }
1332 spin_unlock_bh(lgr_lock);
1333 if (rc)
1334 return rc;
1335
1336 if (role == SMC_CLNT && !ini->first_contact_peer &&
1337 ini->first_contact_local) {
1338 /* Server reuses a link group, but Client wants to start
1339 * a new one
1340 * send out_of_sync decline, reason synchr. error
1341 */
1342 return SMC_CLC_DECL_SYNCERR;
1343 }
1344
1345create:
1346 if (ini->first_contact_local) {
1347 rc = smc_lgr_create(smc, ini);
1348 if (rc)
1349 goto out;
1350 lgr = conn->lgr;
1351 write_lock_bh(&lgr->conns_lock);
1352 rc = smc_lgr_register_conn(conn, true);
1353 write_unlock_bh(&lgr->conns_lock);
1354 if (rc)
1355 goto out;
1356 }
1357 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1358 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1359 conn->urg_state = SMC_URG_READ;
1360 init_waitqueue_head(&conn->cdc_pend_tx_wq);
1361 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1362 if (ini->is_smcd) {
1363 conn->rx_off = sizeof(struct smcd_cdc_msg);
1364 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1365 } else {
1366 conn->rx_off = 0;
1367 }
1368#ifndef KERNEL_HAS_ATOMIC64
1369 spin_lock_init(&conn->acurs_lock);
1370#endif
1371
1372out:
1373 return rc;
1374}
1375
1376/* convert the RMB size into the compressed notation - minimum 16K.
1377 * In contrast to plain ilog2, this rounds towards the next power of 2,
1378 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1379 */
1380static u8 smc_compress_bufsize(int size)
1381{
1382 u8 compressed;
1383
1384 if (size <= SMC_BUF_MIN_SIZE)
1385 return 0;
1386
1387 size = (size - 1) >> 14;
1388 compressed = ilog2(size) + 1;
1389 if (compressed >= SMC_RMBE_SIZES)
1390 compressed = SMC_RMBE_SIZES - 1;
1391 return compressed;
1392}
1393
1394/* convert the RMB size from compressed notation into integer */
1395int smc_uncompress_bufsize(u8 compressed)
1396{
1397 u32 size;
1398
1399 size = 0x00000001 << (((int)compressed) + 14);
1400 return (int)size;
1401}
1402
1403/* try to reuse a sndbuf or rmb description slot for a certain
1404 * buffer size; if not available, return NULL
1405 */
1406static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1407 struct mutex *lock,
1408 struct list_head *buf_list)
1409{
1410 struct smc_buf_desc *buf_slot;
1411
1412 mutex_lock(lock);
1413 list_for_each_entry(buf_slot, buf_list, list) {
1414 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1415 mutex_unlock(lock);
1416 return buf_slot;
1417 }
1418 }
1419 mutex_unlock(lock);
1420 return NULL;
1421}
1422
1423/* one of the conditions for announcing a receiver's current window size is
1424 * that it "results in a minimum increase in the window size of 10% of the
1425 * receive buffer space" [RFC7609]
1426 */
1427static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1428{
1429 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1430}
1431
1432/* map an rmb buf to a link */
1433static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1434 struct smc_link *lnk)
1435{
1436 int rc;
1437
1438 if (buf_desc->is_map_ib[lnk->link_idx])
1439 return 0;
1440
1441 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1442 if (rc)
1443 return rc;
1444 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1445 buf_desc->cpu_addr, buf_desc->len);
1446
1447 /* map sg table to DMA address */
1448 rc = smc_ib_buf_map_sg(lnk, buf_desc,
1449 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1450 /* SMC protocol depends on mapping to one DMA address only */
1451 if (rc != 1) {
1452 rc = -EAGAIN;
1453 goto free_table;
1454 }
1455
1456 /* create a new memory region for the RMB */
1457 if (is_rmb) {
1458 rc = smc_ib_get_memory_region(lnk->roce_pd,
1459 IB_ACCESS_REMOTE_WRITE |
1460 IB_ACCESS_LOCAL_WRITE,
1461 buf_desc, lnk->link_idx);
1462 if (rc)
1463 goto buf_unmap;
1464 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1465 }
1466 buf_desc->is_map_ib[lnk->link_idx] = true;
1467 return 0;
1468
1469buf_unmap:
1470 smc_ib_buf_unmap_sg(lnk, buf_desc,
1471 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1472free_table:
1473 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1474 return rc;
1475}
1476
1477/* register a new rmb on IB device,
1478 * must be called under lgr->llc_conf_mutex lock
1479 */
1480int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1481{
1482 if (list_empty(&link->lgr->list))
1483 return -ENOLINK;
1484 if (!rmb_desc->is_reg_mr[link->link_idx]) {
1485 /* register memory region for new rmb */
1486 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1487 rmb_desc->is_reg_err = true;
1488 return -EFAULT;
1489 }
1490 rmb_desc->is_reg_mr[link->link_idx] = true;
1491 }
1492 return 0;
1493}
1494
1495static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1496 struct list_head *lst, bool is_rmb)
1497{
1498 struct smc_buf_desc *buf_desc, *bf;
1499 int rc = 0;
1500
1501 mutex_lock(lock);
1502 list_for_each_entry_safe(buf_desc, bf, lst, list) {
1503 if (!buf_desc->used)
1504 continue;
1505 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1506 if (rc)
1507 goto out;
1508 }
1509out:
1510 mutex_unlock(lock);
1511 return rc;
1512}
1513
1514/* map all used buffers of lgr for a new link */
1515int smcr_buf_map_lgr(struct smc_link *lnk)
1516{
1517 struct smc_link_group *lgr = lnk->lgr;
1518 int i, rc = 0;
1519
1520 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1521 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1522 &lgr->rmbs[i], true);
1523 if (rc)
1524 return rc;
1525 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1526 &lgr->sndbufs[i], false);
1527 if (rc)
1528 return rc;
1529 }
1530 return 0;
1531}
1532
1533/* register all used buffers of lgr for a new link,
1534 * must be called under lgr->llc_conf_mutex lock
1535 */
1536int smcr_buf_reg_lgr(struct smc_link *lnk)
1537{
1538 struct smc_link_group *lgr = lnk->lgr;
1539 struct smc_buf_desc *buf_desc, *bf;
1540 int i, rc = 0;
1541
1542 mutex_lock(&lgr->rmbs_lock);
1543 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1544 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1545 if (!buf_desc->used)
1546 continue;
1547 rc = smcr_link_reg_rmb(lnk, buf_desc);
1548 if (rc)
1549 goto out;
1550 }
1551 }
1552out:
1553 mutex_unlock(&lgr->rmbs_lock);
1554 return rc;
1555}
1556
1557static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1558 bool is_rmb, int bufsize)
1559{
1560 struct smc_buf_desc *buf_desc;
1561
1562 /* try to alloc a new buffer */
1563 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1564 if (!buf_desc)
1565 return ERR_PTR(-ENOMEM);
1566
1567 buf_desc->order = get_order(bufsize);
1568 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1569 __GFP_NOMEMALLOC | __GFP_COMP |
1570 __GFP_NORETRY | __GFP_ZERO,
1571 buf_desc->order);
1572 if (!buf_desc->pages) {
1573 kfree(buf_desc);
1574 return ERR_PTR(-EAGAIN);
1575 }
1576 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1577 buf_desc->len = bufsize;
1578 return buf_desc;
1579}
1580
1581/* map buf_desc on all usable links,
1582 * unused buffers stay mapped as long as the link is up
1583 */
1584static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1585 struct smc_buf_desc *buf_desc, bool is_rmb)
1586{
1587 int i, rc = 0, cnt = 0;
1588
1589 /* protect against parallel link reconfiguration */
1590 mutex_lock(&lgr->llc_conf_mutex);
1591 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1592 struct smc_link *lnk = &lgr->lnk[i];
1593
1594 if (!smc_link_usable(lnk))
1595 continue;
1596 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1597 rc = -ENOMEM;
1598 goto out;
1599 }
1600 cnt++;
1601 }
1602out:
1603 mutex_unlock(&lgr->llc_conf_mutex);
1604 if (!rc && !cnt)
1605 rc = -EINVAL;
1606 return rc;
1607}
1608
1609#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1610
1611static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
1612 bool is_dmb, int bufsize)
1613{
1614 struct smc_buf_desc *buf_desc;
1615 int rc;
1616
1617 if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
1618 return ERR_PTR(-EAGAIN);
1619
1620 /* try to alloc a new DMB */
1621 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1622 if (!buf_desc)
1623 return ERR_PTR(-ENOMEM);
1624 if (is_dmb) {
1625 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
1626 if (rc) {
1627 kfree(buf_desc);
1628 if (rc == -ENOMEM)
1629 return ERR_PTR(-EAGAIN);
1630 if (rc == -ENOSPC)
1631 return ERR_PTR(-ENOSPC);
1632 return ERR_PTR(-EIO);
1633 }
1634 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
1635 /* CDC header stored in buf. So, pretend it was smaller */
1636 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
1637 } else {
1638 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
1639 __GFP_NOWARN | __GFP_NORETRY |
1640 __GFP_NOMEMALLOC);
1641 if (!buf_desc->cpu_addr) {
1642 kfree(buf_desc);
1643 return ERR_PTR(-EAGAIN);
1644 }
1645 buf_desc->len = bufsize;
1646 }
1647 return buf_desc;
1648}
1649
1650static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
1651{
1652 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
1653 struct smc_connection *conn = &smc->conn;
1654 struct smc_link_group *lgr = conn->lgr;
1655 struct list_head *buf_list;
1656 int bufsize, bufsize_short;
1657 struct mutex *lock; /* lock buffer list */
1658 int sk_buf_size;
1659
1660 if (is_rmb)
1661 /* use socket recv buffer size (w/o overhead) as start value */
1662 sk_buf_size = smc->sk.sk_rcvbuf / 2;
1663 else
1664 /* use socket send buffer size (w/o overhead) as start value */
1665 sk_buf_size = smc->sk.sk_sndbuf / 2;
1666
1667 for (bufsize_short = smc_compress_bufsize(sk_buf_size);
1668 bufsize_short >= 0; bufsize_short--) {
1669
1670 if (is_rmb) {
1671 lock = &lgr->rmbs_lock;
1672 buf_list = &lgr->rmbs[bufsize_short];
1673 } else {
1674 lock = &lgr->sndbufs_lock;
1675 buf_list = &lgr->sndbufs[bufsize_short];
1676 }
1677 bufsize = smc_uncompress_bufsize(bufsize_short);
1678 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
1679 continue;
1680
1681 /* check for reusable slot in the link group */
1682 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
1683 if (buf_desc) {
1684 memset(buf_desc->cpu_addr, 0, bufsize);
1685 break; /* found reusable slot */
1686 }
1687
1688 if (is_smcd)
1689 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
1690 else
1691 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
1692
1693 if (PTR_ERR(buf_desc) == -ENOMEM)
1694 break;
1695 if (IS_ERR(buf_desc))
1696 continue;
1697
1698 buf_desc->used = 1;
1699 mutex_lock(lock);
1700 list_add(&buf_desc->list, buf_list);
1701 mutex_unlock(lock);
1702 break; /* found */
1703 }
1704
1705 if (IS_ERR(buf_desc))
1706 return PTR_ERR(buf_desc);
1707
1708 if (!is_smcd) {
1709 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
1710 smcr_buf_unuse(buf_desc, lgr);
1711 return -ENOMEM;
1712 }
1713 }
1714
1715 if (is_rmb) {
1716 conn->rmb_desc = buf_desc;
1717 conn->rmbe_size_short = bufsize_short;
1718 smc->sk.sk_rcvbuf = bufsize * 2;
1719 atomic_set(&conn->bytes_to_rcv, 0);
1720 conn->rmbe_update_limit =
1721 smc_rmb_wnd_update_limit(buf_desc->len);
1722 if (is_smcd)
1723 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
1724 } else {
1725 conn->sndbuf_desc = buf_desc;
1726 smc->sk.sk_sndbuf = bufsize * 2;
1727 atomic_set(&conn->sndbuf_space, bufsize);
1728 }
1729 return 0;
1730}
1731
1732void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
1733{
1734 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
1735 return;
1736 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
1737}
1738
1739void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
1740{
1741 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
1742 return;
1743 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
1744}
1745
1746void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
1747{
1748 int i;
1749
1750 if (!conn->lgr || conn->lgr->is_smcd)
1751 return;
1752 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1753 if (!smc_link_active(&conn->lgr->lnk[i]))
1754 continue;
1755 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
1756 DMA_FROM_DEVICE);
1757 }
1758}
1759
1760void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
1761{
1762 int i;
1763
1764 if (!conn->lgr || conn->lgr->is_smcd)
1765 return;
1766 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1767 if (!smc_link_active(&conn->lgr->lnk[i]))
1768 continue;
1769 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
1770 DMA_FROM_DEVICE);
1771 }
1772}
1773
1774/* create the send and receive buffer for an SMC socket;
1775 * receive buffers are called RMBs;
1776 * (even though the SMC protocol allows more than one RMB-element per RMB,
1777 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
1778 * extra RMB for every connection in a link group
1779 */
1780int smc_buf_create(struct smc_sock *smc, bool is_smcd)
1781{
1782 int rc;
1783
1784 /* create send buffer */
1785 rc = __smc_buf_create(smc, is_smcd, false);
1786 if (rc)
1787 return rc;
1788 /* create rmb */
1789 rc = __smc_buf_create(smc, is_smcd, true);
1790 if (rc) {
1791 mutex_lock(&smc->conn.lgr->sndbufs_lock);
1792 list_del(&smc->conn.sndbuf_desc->list);
1793 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
1794 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
1795 smc->conn.sndbuf_desc = NULL;
1796 }
1797 return rc;
1798}
1799
1800static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
1801{
1802 int i;
1803
1804 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
1805 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
1806 return i;
1807 }
1808 return -ENOSPC;
1809}
1810
1811static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
1812 u32 rkey)
1813{
1814 int i;
1815
1816 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1817 if (test_bit(i, lgr->rtokens_used_mask) &&
1818 lgr->rtokens[i][lnk_idx].rkey == rkey)
1819 return i;
1820 }
1821 return -ENOENT;
1822}
1823
1824/* set rtoken for a new link to an existing rmb */
1825void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
1826 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
1827{
1828 int rtok_idx;
1829
1830 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
1831 if (rtok_idx == -ENOENT)
1832 return;
1833 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
1834 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
1835}
1836
1837/* set rtoken for a new link whose link_id is given */
1838void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
1839 __be64 nw_vaddr, __be32 nw_rkey)
1840{
1841 u64 dma_addr = be64_to_cpu(nw_vaddr);
1842 u32 rkey = ntohl(nw_rkey);
1843 bool found = false;
1844 int link_idx;
1845
1846 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
1847 if (lgr->lnk[link_idx].link_id == link_id) {
1848 found = true;
1849 break;
1850 }
1851 }
1852 if (!found)
1853 return;
1854 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
1855 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
1856}
1857
1858/* add a new rtoken from peer */
1859int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
1860{
1861 struct smc_link_group *lgr = smc_get_lgr(lnk);
1862 u64 dma_addr = be64_to_cpu(nw_vaddr);
1863 u32 rkey = ntohl(nw_rkey);
1864 int i;
1865
1866 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1867 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
1868 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
1869 test_bit(i, lgr->rtokens_used_mask)) {
1870 /* already in list */
1871 return i;
1872 }
1873 }
1874 i = smc_rmb_reserve_rtoken_idx(lgr);
1875 if (i < 0)
1876 return i;
1877 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
1878 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
1879 return i;
1880}
1881
1882/* delete an rtoken from all links */
1883int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
1884{
1885 struct smc_link_group *lgr = smc_get_lgr(lnk);
1886 u32 rkey = ntohl(nw_rkey);
1887 int i, j;
1888
1889 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1890 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
1891 test_bit(i, lgr->rtokens_used_mask)) {
1892 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
1893 lgr->rtokens[i][j].rkey = 0;
1894 lgr->rtokens[i][j].dma_addr = 0;
1895 }
1896 clear_bit(i, lgr->rtokens_used_mask);
1897 return 0;
1898 }
1899 }
1900 return -ENOENT;
1901}
1902
1903/* save rkey and dma_addr received from peer during clc handshake */
1904int smc_rmb_rtoken_handling(struct smc_connection *conn,
1905 struct smc_link *lnk,
1906 struct smc_clc_msg_accept_confirm *clc)
1907{
1908 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
1909 clc->r0.rmb_rkey);
1910 if (conn->rtoken_idx < 0)
1911 return conn->rtoken_idx;
1912 return 0;
1913}
1914
1915static void smc_core_going_away(void)
1916{
1917 struct smc_ib_device *smcibdev;
1918 struct smcd_dev *smcd;
1919
1920 mutex_lock(&smc_ib_devices.mutex);
1921 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
1922 int i;
1923
1924 for (i = 0; i < SMC_MAX_PORTS; i++)
1925 set_bit(i, smcibdev->ports_going_away);
1926 }
1927 mutex_unlock(&smc_ib_devices.mutex);
1928
1929 mutex_lock(&smcd_dev_list.mutex);
1930 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1931 smcd->going_away = 1;
1932 }
1933 mutex_unlock(&smcd_dev_list.mutex);
1934}
1935
1936/* Clean up all SMC link groups */
1937static void smc_lgrs_shutdown(void)
1938{
1939 struct smcd_dev *smcd;
1940
1941 smc_core_going_away();
1942
1943 smc_smcr_terminate_all(NULL);
1944
1945 mutex_lock(&smcd_dev_list.mutex);
1946 list_for_each_entry(smcd, &smcd_dev_list.list, list)
1947 smc_smcd_terminate_all(smcd);
1948 mutex_unlock(&smcd_dev_list.mutex);
1949}
1950
1951static int smc_core_reboot_event(struct notifier_block *this,
1952 unsigned long event, void *ptr)
1953{
1954 smc_lgrs_shutdown();
1955 smc_ib_unregister_client();
1956 return 0;
1957}
1958
1959static struct notifier_block smc_reboot_notifier = {
1960 .notifier_call = smc_core_reboot_event,
1961};
1962
1963int __init smc_core_init(void)
1964{
1965 return register_reboot_notifier(&smc_reboot_notifier);
1966}
1967
1968/* Called (from smc_exit) when module is removed */
1969void smc_core_exit(void)
1970{
1971 unregister_reboot_notifier(&smc_reboot_notifier);
1972 smc_lgrs_shutdown();
1973}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-17 00:16:58 +0800