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WIP FPC-III support
[linux/fpc-iii.git] / net / smc / smc_core.c
blob59342b519e347cdca6681b80ab65ef22121d60c6
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 <linux/list.h>
20 #include <linux/smc.h>
21 #include <net/tcp.h>
22 #include <net/sock.h>
23 #include <rdma/ib_verbs.h>
24 #include <rdma/ib_cache.h>
25
26 #include "smc.h"
27 #include "smc_clc.h"
28 #include "smc_core.h"
29 #include "smc_ib.h"
30 #include "smc_wr.h"
31 #include "smc_llc.h"
32 #include "smc_cdc.h"
33 #include "smc_close.h"
34 #include "smc_ism.h"
35 #include "smc_netlink.h"
36
37 #define SMC_LGR_NUM_INCR 256
38 #define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
39 #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
40
41 struct smc_lgr_list smc_lgr_list = { /* established link groups */
42 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
43 .list = LIST_HEAD_INIT(smc_lgr_list.list),
44 .num = 0,
45 };
46
47 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
48 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
49
50 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
51 struct smc_buf_desc *buf_desc);
52 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
53
54 static void smc_link_down_work(struct work_struct *work);
55
56 /* return head of link group list and its lock for a given link group */
57 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
58 spinlock_t **lgr_lock)
59 {
60 if (lgr->is_smcd) {
61 *lgr_lock = &lgr->smcd->lgr_lock;
62 return &lgr->smcd->lgr_list;
63 }
64
65 *lgr_lock = &smc_lgr_list.lock;
66 return &smc_lgr_list.list;
67 }
68
69 static void smc_ibdev_cnt_inc(struct smc_link *lnk)
70 {
71 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
72 }
73
74 static void smc_ibdev_cnt_dec(struct smc_link *lnk)
75 {
76 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
77 }
78
79 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
80 {
81 /* client link group creation always follows the server link group
82 * creation. For client use a somewhat higher removal delay time,
83 * otherwise there is a risk of out-of-sync link groups.
84 */
85 if (!lgr->freeing) {
86 mod_delayed_work(system_wq, &lgr->free_work,
87 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
88 SMC_LGR_FREE_DELAY_CLNT :
89 SMC_LGR_FREE_DELAY_SERV);
90 }
91 }
92
93 /* Register connection's alert token in our lookup structure.
94 * To use rbtrees we have to implement our own insert core.
95 * Requires @conns_lock
96 * @smc connection to register
97 * Returns 0 on success, != otherwise.
98 */
99 static void smc_lgr_add_alert_token(struct smc_connection *conn)
100 {
101 struct rb_node **link, *parent = NULL;
102 u32 token = conn->alert_token_local;
103
104 link = &conn->lgr->conns_all.rb_node;
105 while (*link) {
106 struct smc_connection *cur = rb_entry(*link,
107 struct smc_connection, alert_node);
108
109 parent = *link;
110 if (cur->alert_token_local > token)
111 link = &parent->rb_left;
112 else
113 link = &parent->rb_right;
114 }
115 /* Put the new node there */
116 rb_link_node(&conn->alert_node, parent, link);
117 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
118 }
119
120 /* assign an SMC-R link to the connection */
121 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
122 {
123 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
124 SMC_LNK_ACTIVE;
125 int i, j;
126
127 /* do link balancing */
128 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
129 struct smc_link *lnk = &conn->lgr->lnk[i];
130
131 if (lnk->state != expected || lnk->link_is_asym)
132 continue;
133 if (conn->lgr->role == SMC_CLNT) {
134 conn->lnk = lnk; /* temporary, SMC server assigns link*/
135 break;
136 }
137 if (conn->lgr->conns_num % 2) {
138 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
139 struct smc_link *lnk2;
140
141 lnk2 = &conn->lgr->lnk[j];
142 if (lnk2->state == expected &&
143 !lnk2->link_is_asym) {
144 conn->lnk = lnk2;
145 break;
146 }
147 }
148 }
149 if (!conn->lnk)
150 conn->lnk = lnk;
151 break;
152 }
153 if (!conn->lnk)
154 return SMC_CLC_DECL_NOACTLINK;
155 atomic_inc(&conn->lnk->conn_cnt);
156 return 0;
157 }
158
159 /* Register connection in link group by assigning an alert token
160 * registered in a search tree.
161 * Requires @conns_lock
162 * Note that '0' is a reserved value and not assigned.
163 */
164 static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
165 {
166 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
167 static atomic_t nexttoken = ATOMIC_INIT(0);
168 int rc;
169
170 if (!conn->lgr->is_smcd) {
171 rc = smcr_lgr_conn_assign_link(conn, first);
172 if (rc)
173 return rc;
174 }
175 /* find a new alert_token_local value not yet used by some connection
176 * in this link group
177 */
178 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
179 while (!conn->alert_token_local) {
180 conn->alert_token_local = atomic_inc_return(&nexttoken);
181 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
182 conn->alert_token_local = 0;
183 }
184 smc_lgr_add_alert_token(conn);
185 conn->lgr->conns_num++;
186 return 0;
187 }
188
189 /* Unregister connection and reset the alert token of the given connection<
190 */
191 static void __smc_lgr_unregister_conn(struct smc_connection *conn)
192 {
193 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
194 struct smc_link_group *lgr = conn->lgr;
195
196 rb_erase(&conn->alert_node, &lgr->conns_all);
197 if (conn->lnk)
198 atomic_dec(&conn->lnk->conn_cnt);
199 lgr->conns_num--;
200 conn->alert_token_local = 0;
201 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
202 }
203
204 /* Unregister connection from lgr
205 */
206 static void smc_lgr_unregister_conn(struct smc_connection *conn)
207 {
208 struct smc_link_group *lgr = conn->lgr;
209
210 if (!lgr)
211 return;
212 write_lock_bh(&lgr->conns_lock);
213 if (conn->alert_token_local) {
214 __smc_lgr_unregister_conn(conn);
215 }
216 write_unlock_bh(&lgr->conns_lock);
217 conn->lgr = NULL;
218 }
219
220 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
221 {
222 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
223 char hostname[SMC_MAX_HOSTNAME_LEN + 1];
224 char smc_seid[SMC_MAX_EID_LEN + 1];
225 struct smcd_dev *smcd_dev;
226 struct nlattr *attrs;
227 u8 *seid = NULL;
228 u8 *host = NULL;
229 void *nlh;
230
231 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
232 &smc_gen_nl_family, NLM_F_MULTI,
233 SMC_NETLINK_GET_SYS_INFO);
234 if (!nlh)
235 goto errmsg;
236 if (cb_ctx->pos[0])
237 goto errout;
238 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
239 if (!attrs)
240 goto errout;
241 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
242 goto errattr;
243 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
244 goto errattr;
245 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
246 goto errattr;
247 smc_clc_get_hostname(&host);
248 if (host) {
249 snprintf(hostname, sizeof(hostname), "%s", host);
250 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
251 goto errattr;
252 }
253 mutex_lock(&smcd_dev_list.mutex);
254 smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
255 struct smcd_dev, list);
256 if (smcd_dev)
257 smc_ism_get_system_eid(smcd_dev, &seid);
258 mutex_unlock(&smcd_dev_list.mutex);
259 if (seid && smc_ism_is_v2_capable()) {
260 snprintf(smc_seid, sizeof(smc_seid), "%s", seid);
261 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
262 goto errattr;
263 }
264 nla_nest_end(skb, attrs);
265 genlmsg_end(skb, nlh);
266 cb_ctx->pos[0] = 1;
267 return skb->len;
268
269 errattr:
270 nla_nest_cancel(skb, attrs);
271 errout:
272 genlmsg_cancel(skb, nlh);
273 errmsg:
274 return skb->len;
275 }
276
277 static int smc_nl_fill_lgr(struct smc_link_group *lgr,
278 struct sk_buff *skb,
279 struct netlink_callback *cb)
280 {
281 char smc_target[SMC_MAX_PNETID_LEN + 1];
282 struct nlattr *attrs;
283
284 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
285 if (!attrs)
286 goto errout;
287
288 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
289 goto errattr;
290 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
291 goto errattr;
292 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
293 goto errattr;
294 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
295 goto errattr;
296 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
297 goto errattr;
298 snprintf(smc_target, sizeof(smc_target), "%s", lgr->pnet_id);
299 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
300 goto errattr;
301
302 nla_nest_end(skb, attrs);
303 return 0;
304 errattr:
305 nla_nest_cancel(skb, attrs);
306 errout:
307 return -EMSGSIZE;
308 }
309
310 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
311 struct smc_link *link,
312 struct sk_buff *skb,
313 struct netlink_callback *cb)
314 {
315 char smc_ibname[IB_DEVICE_NAME_MAX + 1];
316 u8 smc_gid_target[41];
317 struct nlattr *attrs;
318 u32 link_uid = 0;
319 void *nlh;
320
321 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
322 &smc_gen_nl_family, NLM_F_MULTI,
323 SMC_NETLINK_GET_LINK_SMCR);
324 if (!nlh)
325 goto errmsg;
326
327 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
328 if (!attrs)
329 goto errout;
330
331 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
332 goto errattr;
333 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
334 goto errattr;
335 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
336 atomic_read(&link->conn_cnt)))
337 goto errattr;
338 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
339 goto errattr;
340 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
341 goto errattr;
342 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
343 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
344 goto errattr;
345 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
346 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
347 goto errattr;
348 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
349 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
350 goto errattr;
351 memset(smc_gid_target, 0, sizeof(smc_gid_target));
352 smc_gid_be16_convert(smc_gid_target, link->gid);
353 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
354 goto errattr;
355 memset(smc_gid_target, 0, sizeof(smc_gid_target));
356 smc_gid_be16_convert(smc_gid_target, link->peer_gid);
357 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
358 goto errattr;
359
360 nla_nest_end(skb, attrs);
361 genlmsg_end(skb, nlh);
362 return 0;
363 errattr:
364 nla_nest_cancel(skb, attrs);
365 errout:
366 genlmsg_cancel(skb, nlh);
367 errmsg:
368 return -EMSGSIZE;
369 }
370
371 static int smc_nl_handle_lgr(struct smc_link_group *lgr,
372 struct sk_buff *skb,
373 struct netlink_callback *cb,
374 bool list_links)
375 {
376 void *nlh;
377 int i;
378
379 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
380 &smc_gen_nl_family, NLM_F_MULTI,
381 SMC_NETLINK_GET_LGR_SMCR);
382 if (!nlh)
383 goto errmsg;
384 if (smc_nl_fill_lgr(lgr, skb, cb))
385 goto errout;
386
387 genlmsg_end(skb, nlh);
388 if (!list_links)
389 goto out;
390 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
391 if (!smc_link_usable(&lgr->lnk[i]))
392 continue;
393 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
394 goto errout;
395 }
396 out:
397 return 0;
398
399 errout:
400 genlmsg_cancel(skb, nlh);
401 errmsg:
402 return -EMSGSIZE;
403 }
404
405 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
406 struct sk_buff *skb,
407 struct netlink_callback *cb,
408 bool list_links)
409 {
410 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
411 struct smc_link_group *lgr;
412 int snum = cb_ctx->pos[0];
413 int num = 0;
414
415 spin_lock_bh(&smc_lgr->lock);
416 list_for_each_entry(lgr, &smc_lgr->list, list) {
417 if (num < snum)
418 goto next;
419 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
420 goto errout;
421 next:
422 num++;
423 }
424 errout:
425 spin_unlock_bh(&smc_lgr->lock);
426 cb_ctx->pos[0] = num;
427 }
428
429 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
430 struct sk_buff *skb,
431 struct netlink_callback *cb)
432 {
433 char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
434 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
435 char smc_eid[SMC_MAX_EID_LEN + 1];
436 struct nlattr *v2_attrs;
437 struct nlattr *attrs;
438 void *nlh;
439
440 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
441 &smc_gen_nl_family, NLM_F_MULTI,
442 SMC_NETLINK_GET_LGR_SMCD);
443 if (!nlh)
444 goto errmsg;
445
446 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
447 if (!attrs)
448 goto errout;
449
450 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
451 goto errattr;
452 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
453 SMC_NLA_LGR_D_PAD))
454 goto errattr;
455 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
456 SMC_NLA_LGR_D_PAD))
457 goto errattr;
458 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
459 goto errattr;
460 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
461 goto errattr;
462 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
463 goto errattr;
464 snprintf(smc_pnet, sizeof(smc_pnet), "%s", lgr->smcd->pnetid);
465 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
466 goto errattr;
467
468 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
469 if (!v2_attrs)
470 goto errattr;
471 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
472 goto errv2attr;
473 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
474 goto errv2attr;
475 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
476 goto errv2attr;
477 snprintf(smc_host, sizeof(smc_host), "%s", lgr->peer_hostname);
478 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
479 goto errv2attr;
480 snprintf(smc_eid, sizeof(smc_eid), "%s", lgr->negotiated_eid);
481 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
482 goto errv2attr;
483
484 nla_nest_end(skb, v2_attrs);
485 nla_nest_end(skb, attrs);
486 genlmsg_end(skb, nlh);
487 return 0;
488
489 errv2attr:
490 nla_nest_cancel(skb, v2_attrs);
491 errattr:
492 nla_nest_cancel(skb, attrs);
493 errout:
494 genlmsg_cancel(skb, nlh);
495 errmsg:
496 return -EMSGSIZE;
497 }
498
499 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
500 struct sk_buff *skb,
501 struct netlink_callback *cb)
502 {
503 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
504 struct smc_link_group *lgr;
505 int snum = cb_ctx->pos[1];
506 int rc = 0, num = 0;
507
508 spin_lock_bh(&dev->lgr_lock);
509 list_for_each_entry(lgr, &dev->lgr_list, list) {
510 if (!lgr->is_smcd)
511 continue;
512 if (num < snum)
513 goto next;
514 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
515 if (rc)
516 goto errout;
517 next:
518 num++;
519 }
520 errout:
521 spin_unlock_bh(&dev->lgr_lock);
522 cb_ctx->pos[1] = num;
523 return rc;
524 }
525
526 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
527 struct sk_buff *skb,
528 struct netlink_callback *cb)
529 {
530 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
531 struct smcd_dev *smcd_dev;
532 int snum = cb_ctx->pos[0];
533 int rc = 0, num = 0;
534
535 mutex_lock(&dev_list->mutex);
536 list_for_each_entry(smcd_dev, &dev_list->list, list) {
537 if (list_empty(&smcd_dev->lgr_list))
538 continue;
539 if (num < snum)
540 goto next;
541 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
542 if (rc)
543 goto errout;
544 next:
545 num++;
546 }
547 errout:
548 mutex_unlock(&dev_list->mutex);
549 cb_ctx->pos[0] = num;
550 return rc;
551 }
552
553 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
554 {
555 bool list_links = false;
556
557 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
558 return skb->len;
559 }
560
561 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
562 {
563 bool list_links = true;
564
565 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
566 return skb->len;
567 }
568
569 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
570 {
571 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
572 return skb->len;
573 }
574
575 void smc_lgr_cleanup_early(struct smc_connection *conn)
576 {
577 struct smc_link_group *lgr = conn->lgr;
578 struct list_head *lgr_list;
579 spinlock_t *lgr_lock;
580
581 if (!lgr)
582 return;
583
584 smc_conn_free(conn);
585 lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
586 spin_lock_bh(lgr_lock);
587 /* do not use this link group for new connections */
588 if (!list_empty(lgr_list))
589 list_del_init(lgr_list);
590 spin_unlock_bh(lgr_lock);
591 __smc_lgr_terminate(lgr, true);
592 }
593
594 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
595 {
596 int i;
597
598 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
599 struct smc_link *lnk = &lgr->lnk[i];
600
601 if (smc_link_usable(lnk))
602 lnk->state = SMC_LNK_INACTIVE;
603 }
604 wake_up_all(&lgr->llc_msg_waiter);
605 wake_up_all(&lgr->llc_flow_waiter);
606 }
607
608 static void smc_lgr_free(struct smc_link_group *lgr);
609
610 static void smc_lgr_free_work(struct work_struct *work)
611 {
612 struct smc_link_group *lgr = container_of(to_delayed_work(work),
613 struct smc_link_group,
614 free_work);
615 spinlock_t *lgr_lock;
616 bool conns;
617
618 smc_lgr_list_head(lgr, &lgr_lock);
619 spin_lock_bh(lgr_lock);
620 if (lgr->freeing) {
621 spin_unlock_bh(lgr_lock);
622 return;
623 }
624 read_lock_bh(&lgr->conns_lock);
625 conns = RB_EMPTY_ROOT(&lgr->conns_all);
626 read_unlock_bh(&lgr->conns_lock);
627 if (!conns) { /* number of lgr connections is no longer zero */
628 spin_unlock_bh(lgr_lock);
629 return;
630 }
631 list_del_init(&lgr->list); /* remove from smc_lgr_list */
632 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
633 spin_unlock_bh(lgr_lock);
634 cancel_delayed_work(&lgr->free_work);
635
636 if (!lgr->is_smcd && !lgr->terminating)
637 smc_llc_send_link_delete_all(lgr, true,
638 SMC_LLC_DEL_PROG_INIT_TERM);
639 if (lgr->is_smcd && !lgr->terminating)
640 smc_ism_signal_shutdown(lgr);
641 if (!lgr->is_smcd)
642 smcr_lgr_link_deactivate_all(lgr);
643 smc_lgr_free(lgr);
644 }
645
646 static void smc_lgr_terminate_work(struct work_struct *work)
647 {
648 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
649 terminate_work);
650
651 __smc_lgr_terminate(lgr, true);
652 }
653
654 /* return next unique link id for the lgr */
655 static u8 smcr_next_link_id(struct smc_link_group *lgr)
656 {
657 u8 link_id;
658 int i;
659
660 while (1) {
661 link_id = ++lgr->next_link_id;
662 if (!link_id) /* skip zero as link_id */
663 link_id = ++lgr->next_link_id;
664 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
665 if (smc_link_usable(&lgr->lnk[i]) &&
666 lgr->lnk[i].link_id == link_id)
667 continue;
668 }
669 break;
670 }
671 return link_id;
672 }
673
674 static void smcr_copy_dev_info_to_link(struct smc_link *link)
675 {
676 struct smc_ib_device *smcibdev = link->smcibdev;
677
678 snprintf(link->ibname, sizeof(link->ibname), "%s",
679 smcibdev->ibdev->name);
680 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
681 }
682
683 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
684 u8 link_idx, struct smc_init_info *ini)
685 {
686 u8 rndvec[3];
687 int rc;
688
689 get_device(&ini->ib_dev->ibdev->dev);
690 atomic_inc(&ini->ib_dev->lnk_cnt);
691 lnk->link_id = smcr_next_link_id(lgr);
692 lnk->lgr = lgr;
693 lnk->link_idx = link_idx;
694 lnk->smcibdev = ini->ib_dev;
695 lnk->ibport = ini->ib_port;
696 smc_ibdev_cnt_inc(lnk);
697 smcr_copy_dev_info_to_link(lnk);
698 lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
699 atomic_set(&lnk->conn_cnt, 0);
700 smc_llc_link_set_uid(lnk);
701 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
702 if (!ini->ib_dev->initialized) {
703 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
704 if (rc)
705 goto out;
706 }
707 get_random_bytes(rndvec, sizeof(rndvec));
708 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
709 (rndvec[2] << 16);
710 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
711 ini->vlan_id, lnk->gid, &lnk->sgid_index);
712 if (rc)
713 goto out;
714 rc = smc_llc_link_init(lnk);
715 if (rc)
716 goto out;
717 rc = smc_wr_alloc_link_mem(lnk);
718 if (rc)
719 goto clear_llc_lnk;
720 rc = smc_ib_create_protection_domain(lnk);
721 if (rc)
722 goto free_link_mem;
723 rc = smc_ib_create_queue_pair(lnk);
724 if (rc)
725 goto dealloc_pd;
726 rc = smc_wr_create_link(lnk);
727 if (rc)
728 goto destroy_qp;
729 lnk->state = SMC_LNK_ACTIVATING;
730 return 0;
731
732 destroy_qp:
733 smc_ib_destroy_queue_pair(lnk);
734 dealloc_pd:
735 smc_ib_dealloc_protection_domain(lnk);
736 free_link_mem:
737 smc_wr_free_link_mem(lnk);
738 clear_llc_lnk:
739 smc_llc_link_clear(lnk, false);
740 out:
741 smc_ibdev_cnt_dec(lnk);
742 put_device(&ini->ib_dev->ibdev->dev);
743 memset(lnk, 0, sizeof(struct smc_link));
744 lnk->state = SMC_LNK_UNUSED;
745 if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
746 wake_up(&ini->ib_dev->lnks_deleted);
747 return rc;
748 }
749
750 /* create a new SMC link group */
751 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
752 {
753 struct smc_link_group *lgr;
754 struct list_head *lgr_list;
755 struct smc_link *lnk;
756 spinlock_t *lgr_lock;
757 u8 link_idx;
758 int rc = 0;
759 int i;
760
761 if (ini->is_smcd && ini->vlan_id) {
762 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
763 ini->vlan_id)) {
764 rc = SMC_CLC_DECL_ISMVLANERR;
765 goto out;
766 }
767 }
768
769 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
770 if (!lgr) {
771 rc = SMC_CLC_DECL_MEM;
772 goto ism_put_vlan;
773 }
774 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
775 SMC_LGR_ID_SIZE, &lgr->id);
776 if (!lgr->tx_wq) {
777 rc = -ENOMEM;
778 goto free_lgr;
779 }
780 lgr->is_smcd = ini->is_smcd;
781 lgr->sync_err = 0;
782 lgr->terminating = 0;
783 lgr->freeing = 0;
784 lgr->vlan_id = ini->vlan_id;
785 mutex_init(&lgr->sndbufs_lock);
786 mutex_init(&lgr->rmbs_lock);
787 rwlock_init(&lgr->conns_lock);
788 for (i = 0; i < SMC_RMBE_SIZES; i++) {
789 INIT_LIST_HEAD(&lgr->sndbufs[i]);
790 INIT_LIST_HEAD(&lgr->rmbs[i]);
791 }
792 lgr->next_link_id = 0;
793 smc_lgr_list.num += SMC_LGR_NUM_INCR;
794 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
795 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
796 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
797 lgr->conns_all = RB_ROOT;
798 if (ini->is_smcd) {
799 /* SMC-D specific settings */
800 get_device(&ini->ism_dev[ini->ism_selected]->dev);
801 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
802 lgr->smcd = ini->ism_dev[ini->ism_selected];
803 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
804 lgr_lock = &lgr->smcd->lgr_lock;
805 lgr->smc_version = ini->smcd_version;
806 lgr->peer_shutdown = 0;
807 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
808 } else {
809 /* SMC-R specific settings */
810 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
811 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
812 SMC_SYSTEMID_LEN);
813 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
814 SMC_MAX_PNETID_LEN);
815 smc_llc_lgr_init(lgr, smc);
816
817 link_idx = SMC_SINGLE_LINK;
818 lnk = &lgr->lnk[link_idx];
819 rc = smcr_link_init(lgr, lnk, link_idx, ini);
820 if (rc)
821 goto free_wq;
822 lgr_list = &smc_lgr_list.list;
823 lgr_lock = &smc_lgr_list.lock;
824 atomic_inc(&lgr_cnt);
825 }
826 smc->conn.lgr = lgr;
827 spin_lock_bh(lgr_lock);
828 list_add_tail(&lgr->list, lgr_list);
829 spin_unlock_bh(lgr_lock);
830 return 0;
831
832 free_wq:
833 destroy_workqueue(lgr->tx_wq);
834 free_lgr:
835 kfree(lgr);
836 ism_put_vlan:
837 if (ini->is_smcd && ini->vlan_id)
838 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
839 out:
840 if (rc < 0) {
841 if (rc == -ENOMEM)
842 rc = SMC_CLC_DECL_MEM;
843 else
844 rc = SMC_CLC_DECL_INTERR;
845 }
846 return rc;
847 }
848
849 static int smc_write_space(struct smc_connection *conn)
850 {
851 int buffer_len = conn->peer_rmbe_size;
852 union smc_host_cursor prod;
853 union smc_host_cursor cons;
854 int space;
855
856 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
857 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
858 /* determine rx_buf space */
859 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
860 return space;
861 }
862
863 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
864 struct smc_wr_buf *wr_buf)
865 {
866 struct smc_connection *conn = &smc->conn;
867 union smc_host_cursor cons, fin;
868 int rc = 0;
869 int diff;
870
871 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
872 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
873 /* set prod cursor to old state, enforce tx_rdma_writes() */
874 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
875 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
876
877 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
878 /* cons cursor advanced more than fin, and prod was set
879 * fin above, so now prod is smaller than cons. Fix that.
880 */
881 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
882 smc_curs_add(conn->sndbuf_desc->len,
883 &conn->tx_curs_sent, diff);
884 smc_curs_add(conn->sndbuf_desc->len,
885 &conn->tx_curs_fin, diff);
886
887 smp_mb__before_atomic();
888 atomic_add(diff, &conn->sndbuf_space);
889 smp_mb__after_atomic();
890
891 smc_curs_add(conn->peer_rmbe_size,
892 &conn->local_tx_ctrl.prod, diff);
893 smc_curs_add(conn->peer_rmbe_size,
894 &conn->local_tx_ctrl_fin, diff);
895 }
896 /* recalculate, value is used by tx_rdma_writes() */
897 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
898
899 if (smc->sk.sk_state != SMC_INIT &&
900 smc->sk.sk_state != SMC_CLOSED) {
901 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
902 if (!rc) {
903 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
904 smc->sk.sk_data_ready(&smc->sk);
905 }
906 } else {
907 smc_wr_tx_put_slot(conn->lnk,
908 (struct smc_wr_tx_pend_priv *)pend);
909 }
910 return rc;
911 }
912
913 static void smc_switch_link_and_count(struct smc_connection *conn,
914 struct smc_link *to_lnk)
915 {
916 atomic_dec(&conn->lnk->conn_cnt);
917 conn->lnk = to_lnk;
918 atomic_inc(&conn->lnk->conn_cnt);
919 }
920
921 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
922 struct smc_link *from_lnk, bool is_dev_err)
923 {
924 struct smc_link *to_lnk = NULL;
925 struct smc_cdc_tx_pend *pend;
926 struct smc_connection *conn;
927 struct smc_wr_buf *wr_buf;
928 struct smc_sock *smc;
929 struct rb_node *node;
930 int i, rc = 0;
931
932 /* link is inactive, wake up tx waiters */
933 smc_wr_wakeup_tx_wait(from_lnk);
934
935 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
936 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
937 continue;
938 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
939 from_lnk->ibport == lgr->lnk[i].ibport) {
940 continue;
941 }
942 to_lnk = &lgr->lnk[i];
943 break;
944 }
945 if (!to_lnk) {
946 smc_lgr_terminate_sched(lgr);
947 return NULL;
948 }
949 again:
950 read_lock_bh(&lgr->conns_lock);
951 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
952 conn = rb_entry(node, struct smc_connection, alert_node);
953 if (conn->lnk != from_lnk)
954 continue;
955 smc = container_of(conn, struct smc_sock, conn);
956 /* conn->lnk not yet set in SMC_INIT state */
957 if (smc->sk.sk_state == SMC_INIT)
958 continue;
959 if (smc->sk.sk_state == SMC_CLOSED ||
960 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
961 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
962 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
963 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
964 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
965 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
966 smc->sk.sk_state == SMC_PEERABORTWAIT ||
967 smc->sk.sk_state == SMC_PROCESSABORT) {
968 spin_lock_bh(&conn->send_lock);
969 smc_switch_link_and_count(conn, to_lnk);
970 spin_unlock_bh(&conn->send_lock);
971 continue;
972 }
973 sock_hold(&smc->sk);
974 read_unlock_bh(&lgr->conns_lock);
975 /* pre-fetch buffer outside of send_lock, might sleep */
976 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
977 if (rc) {
978 smcr_link_down_cond_sched(to_lnk);
979 return NULL;
980 }
981 /* avoid race with smcr_tx_sndbuf_nonempty() */
982 spin_lock_bh(&conn->send_lock);
983 smc_switch_link_and_count(conn, to_lnk);
984 rc = smc_switch_cursor(smc, pend, wr_buf);
985 spin_unlock_bh(&conn->send_lock);
986 sock_put(&smc->sk);
987 if (rc) {
988 smcr_link_down_cond_sched(to_lnk);
989 return NULL;
990 }
991 goto again;
992 }
993 read_unlock_bh(&lgr->conns_lock);
994 return to_lnk;
995 }
996
997 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
998 struct smc_link_group *lgr)
999 {
1000 int rc;
1001
1002 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1003 /* unregister rmb with peer */
1004 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1005 if (!rc) {
1006 /* protect against smc_llc_cli_rkey_exchange() */
1007 mutex_lock(&lgr->llc_conf_mutex);
1008 smc_llc_do_delete_rkey(lgr, rmb_desc);
1009 rmb_desc->is_conf_rkey = false;
1010 mutex_unlock(&lgr->llc_conf_mutex);
1011 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1012 }
1013 }
1014
1015 if (rmb_desc->is_reg_err) {
1016 /* buf registration failed, reuse not possible */
1017 mutex_lock(&lgr->rmbs_lock);
1018 list_del(&rmb_desc->list);
1019 mutex_unlock(&lgr->rmbs_lock);
1020
1021 smc_buf_free(lgr, true, rmb_desc);
1022 } else {
1023 rmb_desc->used = 0;
1024 }
1025 }
1026
1027 static void smc_buf_unuse(struct smc_connection *conn,
1028 struct smc_link_group *lgr)
1029 {
1030 if (conn->sndbuf_desc)
1031 conn->sndbuf_desc->used = 0;
1032 if (conn->rmb_desc && lgr->is_smcd)
1033 conn->rmb_desc->used = 0;
1034 else if (conn->rmb_desc)
1035 smcr_buf_unuse(conn->rmb_desc, lgr);
1036 }
1037
1038 /* remove a finished connection from its link group */
1039 void smc_conn_free(struct smc_connection *conn)
1040 {
1041 struct smc_link_group *lgr = conn->lgr;
1042
1043 if (!lgr)
1044 return;
1045 if (lgr->is_smcd) {
1046 if (!list_empty(&lgr->list))
1047 smc_ism_unset_conn(conn);
1048 tasklet_kill(&conn->rx_tsklet);
1049 } else {
1050 smc_cdc_tx_dismiss_slots(conn);
1051 if (current_work() != &conn->abort_work)
1052 cancel_work_sync(&conn->abort_work);
1053 }
1054 if (!list_empty(&lgr->list)) {
1055 smc_lgr_unregister_conn(conn);
1056 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1057 }
1058
1059 if (!lgr->conns_num)
1060 smc_lgr_schedule_free_work(lgr);
1061 }
1062
1063 /* unregister a link from a buf_desc */
1064 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1065 struct smc_link *lnk)
1066 {
1067 if (is_rmb)
1068 buf_desc->is_reg_mr[lnk->link_idx] = false;
1069 if (!buf_desc->is_map_ib[lnk->link_idx])
1070 return;
1071 if (is_rmb) {
1072 if (buf_desc->mr_rx[lnk->link_idx]) {
1073 smc_ib_put_memory_region(
1074 buf_desc->mr_rx[lnk->link_idx]);
1075 buf_desc->mr_rx[lnk->link_idx] = NULL;
1076 }
1077 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1078 } else {
1079 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1080 }
1081 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1082 buf_desc->is_map_ib[lnk->link_idx] = false;
1083 }
1084
1085 /* unmap all buffers of lgr for a deleted link */
1086 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1087 {
1088 struct smc_link_group *lgr = lnk->lgr;
1089 struct smc_buf_desc *buf_desc, *bf;
1090 int i;
1091
1092 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1093 mutex_lock(&lgr->rmbs_lock);
1094 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1095 smcr_buf_unmap_link(buf_desc, true, lnk);
1096 mutex_unlock(&lgr->rmbs_lock);
1097 mutex_lock(&lgr->sndbufs_lock);
1098 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1099 list)
1100 smcr_buf_unmap_link(buf_desc, false, lnk);
1101 mutex_unlock(&lgr->sndbufs_lock);
1102 }
1103 }
1104
1105 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1106 {
1107 struct smc_link_group *lgr = lnk->lgr;
1108 int i;
1109
1110 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1111 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1112 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1113 }
1114 }
1115
1116 /* must be called under lgr->llc_conf_mutex lock */
1117 void smcr_link_clear(struct smc_link *lnk, bool log)
1118 {
1119 struct smc_ib_device *smcibdev;
1120
1121 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
1122 return;
1123 lnk->peer_qpn = 0;
1124 smc_llc_link_clear(lnk, log);
1125 smcr_buf_unmap_lgr(lnk);
1126 smcr_rtoken_clear_link(lnk);
1127 smc_ib_modify_qp_reset(lnk);
1128 smc_wr_free_link(lnk);
1129 smc_ib_destroy_queue_pair(lnk);
1130 smc_ib_dealloc_protection_domain(lnk);
1131 smc_wr_free_link_mem(lnk);
1132 smc_ibdev_cnt_dec(lnk);
1133 put_device(&lnk->smcibdev->ibdev->dev);
1134 smcibdev = lnk->smcibdev;
1135 memset(lnk, 0, sizeof(struct smc_link));
1136 lnk->state = SMC_LNK_UNUSED;
1137 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1138 wake_up(&smcibdev->lnks_deleted);
1139 }
1140
1141 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1142 struct smc_buf_desc *buf_desc)
1143 {
1144 int i;
1145
1146 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1147 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1148
1149 if (buf_desc->pages)
1150 __free_pages(buf_desc->pages, buf_desc->order);
1151 kfree(buf_desc);
1152 }
1153
1154 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1155 struct smc_buf_desc *buf_desc)
1156 {
1157 if (is_dmb) {
1158 /* restore original buf len */
1159 buf_desc->len += sizeof(struct smcd_cdc_msg);
1160 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1161 } else {
1162 kfree(buf_desc->cpu_addr);
1163 }
1164 kfree(buf_desc);
1165 }
1166
1167 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1168 struct smc_buf_desc *buf_desc)
1169 {
1170 if (lgr->is_smcd)
1171 smcd_buf_free(lgr, is_rmb, buf_desc);
1172 else
1173 smcr_buf_free(lgr, is_rmb, buf_desc);
1174 }
1175
1176 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1177 {
1178 struct smc_buf_desc *buf_desc, *bf_desc;
1179 struct list_head *buf_list;
1180 int i;
1181
1182 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1183 if (is_rmb)
1184 buf_list = &lgr->rmbs[i];
1185 else
1186 buf_list = &lgr->sndbufs[i];
1187 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1188 list) {
1189 list_del(&buf_desc->list);
1190 smc_buf_free(lgr, is_rmb, buf_desc);
1191 }
1192 }
1193 }
1194
1195 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1196 {
1197 /* free send buffers */
1198 __smc_lgr_free_bufs(lgr, false);
1199 /* free rmbs */
1200 __smc_lgr_free_bufs(lgr, true);
1201 }
1202
1203 /* remove a link group */
1204 static void smc_lgr_free(struct smc_link_group *lgr)
1205 {
1206 int i;
1207
1208 if (!lgr->is_smcd) {
1209 mutex_lock(&lgr->llc_conf_mutex);
1210 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1211 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1212 smcr_link_clear(&lgr->lnk[i], false);
1213 }
1214 mutex_unlock(&lgr->llc_conf_mutex);
1215 smc_llc_lgr_clear(lgr);
1216 }
1217
1218 smc_lgr_free_bufs(lgr);
1219 destroy_workqueue(lgr->tx_wq);
1220 if (lgr->is_smcd) {
1221 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1222 put_device(&lgr->smcd->dev);
1223 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1224 wake_up(&lgr->smcd->lgrs_deleted);
1225 } else {
1226 if (!atomic_dec_return(&lgr_cnt))
1227 wake_up(&lgrs_deleted);
1228 }
1229 kfree(lgr);
1230 }
1231
1232 static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
1233 {
1234 int i;
1235
1236 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1237 struct smc_buf_desc *buf_desc;
1238
1239 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
1240 buf_desc->len += sizeof(struct smcd_cdc_msg);
1241 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1242 }
1243 }
1244 }
1245
1246 static void smc_sk_wake_ups(struct smc_sock *smc)
1247 {
1248 smc->sk.sk_write_space(&smc->sk);
1249 smc->sk.sk_data_ready(&smc->sk);
1250 smc->sk.sk_state_change(&smc->sk);
1251 }
1252
1253 /* kill a connection */
1254 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1255 {
1256 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1257
1258 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1259 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1260 else
1261 smc_close_abort(conn);
1262 conn->killed = 1;
1263 smc->sk.sk_err = ECONNABORTED;
1264 smc_sk_wake_ups(smc);
1265 if (conn->lgr->is_smcd) {
1266 smc_ism_unset_conn(conn);
1267 if (soft)
1268 tasklet_kill(&conn->rx_tsklet);
1269 else
1270 tasklet_unlock_wait(&conn->rx_tsklet);
1271 } else {
1272 smc_cdc_tx_dismiss_slots(conn);
1273 }
1274 smc_lgr_unregister_conn(conn);
1275 smc_close_active_abort(smc);
1276 }
1277
1278 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1279 {
1280 if (lgr->is_smcd) {
1281 smc_ism_signal_shutdown(lgr);
1282 smcd_unregister_all_dmbs(lgr);
1283 } else {
1284 u32 rsn = lgr->llc_termination_rsn;
1285
1286 if (!rsn)
1287 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1288 smc_llc_send_link_delete_all(lgr, false, rsn);
1289 smcr_lgr_link_deactivate_all(lgr);
1290 }
1291 }
1292
1293 /* terminate link group
1294 * @soft: true if link group shutdown can take its time
1295 * false if immediate link group shutdown is required
1296 */
1297 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1298 {
1299 struct smc_connection *conn;
1300 struct smc_sock *smc;
1301 struct rb_node *node;
1302
1303 if (lgr->terminating)
1304 return; /* lgr already terminating */
1305 /* cancel free_work sync, will terminate when lgr->freeing is set */
1306 cancel_delayed_work_sync(&lgr->free_work);
1307 lgr->terminating = 1;
1308
1309 /* kill remaining link group connections */
1310 read_lock_bh(&lgr->conns_lock);
1311 node = rb_first(&lgr->conns_all);
1312 while (node) {
1313 read_unlock_bh(&lgr->conns_lock);
1314 conn = rb_entry(node, struct smc_connection, alert_node);
1315 smc = container_of(conn, struct smc_sock, conn);
1316 sock_hold(&smc->sk); /* sock_put below */
1317 lock_sock(&smc->sk);
1318 smc_conn_kill(conn, soft);
1319 release_sock(&smc->sk);
1320 sock_put(&smc->sk); /* sock_hold above */
1321 read_lock_bh(&lgr->conns_lock);
1322 node = rb_first(&lgr->conns_all);
1323 }
1324 read_unlock_bh(&lgr->conns_lock);
1325 smc_lgr_cleanup(lgr);
1326 smc_lgr_free(lgr);
1327 }
1328
1329 /* unlink link group and schedule termination */
1330 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1331 {
1332 spinlock_t *lgr_lock;
1333
1334 smc_lgr_list_head(lgr, &lgr_lock);
1335 spin_lock_bh(lgr_lock);
1336 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1337 spin_unlock_bh(lgr_lock);
1338 return; /* lgr already terminating */
1339 }
1340 list_del_init(&lgr->list);
1341 lgr->freeing = 1;
1342 spin_unlock_bh(lgr_lock);
1343 schedule_work(&lgr->terminate_work);
1344 }
1345
1346 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1347 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1348 {
1349 struct smc_link_group *lgr, *l;
1350 LIST_HEAD(lgr_free_list);
1351
1352 /* run common cleanup function and build free list */
1353 spin_lock_bh(&dev->lgr_lock);
1354 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1355 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1356 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1357 if (peer_gid) /* peer triggered termination */
1358 lgr->peer_shutdown = 1;
1359 list_move(&lgr->list, &lgr_free_list);
1360 lgr->freeing = 1;
1361 }
1362 }
1363 spin_unlock_bh(&dev->lgr_lock);
1364
1365 /* cancel the regular free workers and actually free lgrs */
1366 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1367 list_del_init(&lgr->list);
1368 schedule_work(&lgr->terminate_work);
1369 }
1370 }
1371
1372 /* Called when an SMCD device is removed or the smc module is unloaded */
1373 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1374 {
1375 struct smc_link_group *lgr, *lg;
1376 LIST_HEAD(lgr_free_list);
1377
1378 spin_lock_bh(&smcd->lgr_lock);
1379 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1380 list_for_each_entry(lgr, &lgr_free_list, list)
1381 lgr->freeing = 1;
1382 spin_unlock_bh(&smcd->lgr_lock);
1383
1384 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1385 list_del_init(&lgr->list);
1386 __smc_lgr_terminate(lgr, false);
1387 }
1388
1389 if (atomic_read(&smcd->lgr_cnt))
1390 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1391 }
1392
1393 /* Called when an SMCR device is removed or the smc module is unloaded.
1394 * If smcibdev is given, all SMCR link groups using this device are terminated.
1395 * If smcibdev is NULL, all SMCR link groups are terminated.
1396 */
1397 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1398 {
1399 struct smc_link_group *lgr, *lg;
1400 LIST_HEAD(lgr_free_list);
1401 int i;
1402
1403 spin_lock_bh(&smc_lgr_list.lock);
1404 if (!smcibdev) {
1405 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1406 list_for_each_entry(lgr, &lgr_free_list, list)
1407 lgr->freeing = 1;
1408 } else {
1409 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1410 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1411 if (lgr->lnk[i].smcibdev == smcibdev)
1412 smcr_link_down_cond_sched(&lgr->lnk[i]);
1413 }
1414 }
1415 }
1416 spin_unlock_bh(&smc_lgr_list.lock);
1417
1418 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1419 list_del_init(&lgr->list);
1420 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1421 __smc_lgr_terminate(lgr, false);
1422 }
1423
1424 if (smcibdev) {
1425 if (atomic_read(&smcibdev->lnk_cnt))
1426 wait_event(smcibdev->lnks_deleted,
1427 !atomic_read(&smcibdev->lnk_cnt));
1428 } else {
1429 if (atomic_read(&lgr_cnt))
1430 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1431 }
1432 }
1433
1434 /* set new lgr type and clear all asymmetric link tagging */
1435 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1436 {
1437 char *lgr_type = "";
1438 int i;
1439
1440 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1441 if (smc_link_usable(&lgr->lnk[i]))
1442 lgr->lnk[i].link_is_asym = false;
1443 if (lgr->type == new_type)
1444 return;
1445 lgr->type = new_type;
1446
1447 switch (lgr->type) {
1448 case SMC_LGR_NONE:
1449 lgr_type = "NONE";
1450 break;
1451 case SMC_LGR_SINGLE:
1452 lgr_type = "SINGLE";
1453 break;
1454 case SMC_LGR_SYMMETRIC:
1455 lgr_type = "SYMMETRIC";
1456 break;
1457 case SMC_LGR_ASYMMETRIC_PEER:
1458 lgr_type = "ASYMMETRIC_PEER";
1459 break;
1460 case SMC_LGR_ASYMMETRIC_LOCAL:
1461 lgr_type = "ASYMMETRIC_LOCAL";
1462 break;
1463 }
1464 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1465 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1466 lgr_type, lgr->pnet_id);
1467 }
1468
1469 /* set new lgr type and tag a link as asymmetric */
1470 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1471 enum smc_lgr_type new_type, int asym_lnk_idx)
1472 {
1473 smcr_lgr_set_type(lgr, new_type);
1474 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1475 }
1476
1477 /* abort connection, abort_work scheduled from tasklet context */
1478 static void smc_conn_abort_work(struct work_struct *work)
1479 {
1480 struct smc_connection *conn = container_of(work,
1481 struct smc_connection,
1482 abort_work);
1483 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1484
1485 smc_conn_kill(conn, true);
1486 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1487 }
1488
1489 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1490 {
1491 struct smc_link_group *lgr, *n;
1492
1493 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1494 struct smc_link *link;
1495
1496 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1497 SMC_MAX_PNETID_LEN) ||
1498 lgr->type == SMC_LGR_SYMMETRIC ||
1499 lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1500 continue;
1501
1502 /* trigger local add link processing */
1503 link = smc_llc_usable_link(lgr);
1504 if (link)
1505 smc_llc_add_link_local(link);
1506 }
1507 }
1508
1509 /* link is down - switch connections to alternate link,
1510 * must be called under lgr->llc_conf_mutex lock
1511 */
1512 static void smcr_link_down(struct smc_link *lnk)
1513 {
1514 struct smc_link_group *lgr = lnk->lgr;
1515 struct smc_link *to_lnk;
1516 int del_link_id;
1517
1518 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1519 return;
1520
1521 smc_ib_modify_qp_reset(lnk);
1522 to_lnk = smc_switch_conns(lgr, lnk, true);
1523 if (!to_lnk) { /* no backup link available */
1524 smcr_link_clear(lnk, true);
1525 return;
1526 }
1527 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1528 del_link_id = lnk->link_id;
1529
1530 if (lgr->role == SMC_SERV) {
1531 /* trigger local delete link processing */
1532 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1533 } else {
1534 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1535 /* another llc task is ongoing */
1536 mutex_unlock(&lgr->llc_conf_mutex);
1537 wait_event_timeout(lgr->llc_flow_waiter,
1538 (list_empty(&lgr->list) ||
1539 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1540 SMC_LLC_WAIT_TIME);
1541 mutex_lock(&lgr->llc_conf_mutex);
1542 }
1543 if (!list_empty(&lgr->list)) {
1544 smc_llc_send_delete_link(to_lnk, del_link_id,
1545 SMC_LLC_REQ, true,
1546 SMC_LLC_DEL_LOST_PATH);
1547 smcr_link_clear(lnk, true);
1548 }
1549 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1550 }
1551 }
1552
1553 /* must be called under lgr->llc_conf_mutex lock */
1554 void smcr_link_down_cond(struct smc_link *lnk)
1555 {
1556 if (smc_link_downing(&lnk->state))
1557 smcr_link_down(lnk);
1558 }
1559
1560 /* will get the lgr->llc_conf_mutex lock */
1561 void smcr_link_down_cond_sched(struct smc_link *lnk)
1562 {
1563 if (smc_link_downing(&lnk->state))
1564 schedule_work(&lnk->link_down_wrk);
1565 }
1566
1567 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1568 {
1569 struct smc_link_group *lgr, *n;
1570 int i;
1571
1572 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1573 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1574 SMC_MAX_PNETID_LEN))
1575 continue; /* lgr is not affected */
1576 if (list_empty(&lgr->list))
1577 continue;
1578 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1579 struct smc_link *lnk = &lgr->lnk[i];
1580
1581 if (smc_link_usable(lnk) &&
1582 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1583 smcr_link_down_cond_sched(lnk);
1584 }
1585 }
1586 }
1587
1588 static void smc_link_down_work(struct work_struct *work)
1589 {
1590 struct smc_link *link = container_of(work, struct smc_link,
1591 link_down_wrk);
1592 struct smc_link_group *lgr = link->lgr;
1593
1594 if (list_empty(&lgr->list))
1595 return;
1596 wake_up_all(&lgr->llc_msg_waiter);
1597 mutex_lock(&lgr->llc_conf_mutex);
1598 smcr_link_down(link);
1599 mutex_unlock(&lgr->llc_conf_mutex);
1600 }
1601
1602 /* Determine vlan of internal TCP socket.
1603 * @vlan_id: address to store the determined vlan id into
1604 */
1605 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1606 {
1607 struct dst_entry *dst = sk_dst_get(clcsock->sk);
1608 struct net_device *ndev;
1609 int i, nest_lvl, rc = 0;
1610
1611 ini->vlan_id = 0;
1612 if (!dst) {
1613 rc = -ENOTCONN;
1614 goto out;
1615 }
1616 if (!dst->dev) {
1617 rc = -ENODEV;
1618 goto out_rel;
1619 }
1620
1621 ndev = dst->dev;
1622 if (is_vlan_dev(ndev)) {
1623 ini->vlan_id = vlan_dev_vlan_id(ndev);
1624 goto out_rel;
1625 }
1626
1627 rtnl_lock();
1628 nest_lvl = ndev->lower_level;
1629 for (i = 0; i < nest_lvl; i++) {
1630 struct list_head *lower = &ndev->adj_list.lower;
1631
1632 if (list_empty(lower))
1633 break;
1634 lower = lower->next;
1635 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1636 if (is_vlan_dev(ndev)) {
1637 ini->vlan_id = vlan_dev_vlan_id(ndev);
1638 break;
1639 }
1640 }
1641 rtnl_unlock();
1642
1643 out_rel:
1644 dst_release(dst);
1645 out:
1646 return rc;
1647 }
1648
1649 static bool smcr_lgr_match(struct smc_link_group *lgr,
1650 struct smc_clc_msg_local *lcl,
1651 enum smc_lgr_role role, u32 clcqpn)
1652 {
1653 int i;
1654
1655 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1656 lgr->role != role)
1657 return false;
1658
1659 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1660 if (!smc_link_active(&lgr->lnk[i]))
1661 continue;
1662 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1663 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1664 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1665 return true;
1666 }
1667 return false;
1668 }
1669
1670 static bool smcd_lgr_match(struct smc_link_group *lgr,
1671 struct smcd_dev *smcismdev, u64 peer_gid)
1672 {
1673 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1674 }
1675
1676 /* create a new SMC connection (and a new link group if necessary) */
1677 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1678 {
1679 struct smc_connection *conn = &smc->conn;
1680 struct list_head *lgr_list;
1681 struct smc_link_group *lgr;
1682 enum smc_lgr_role role;
1683 spinlock_t *lgr_lock;
1684 int rc = 0;
1685
1686 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1687 &smc_lgr_list.list;
1688 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1689 &smc_lgr_list.lock;
1690 ini->first_contact_local = 1;
1691 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1692 if (role == SMC_CLNT && ini->first_contact_peer)
1693 /* create new link group as well */
1694 goto create;
1695
1696 /* determine if an existing link group can be reused */
1697 spin_lock_bh(lgr_lock);
1698 list_for_each_entry(lgr, lgr_list, list) {
1699 write_lock_bh(&lgr->conns_lock);
1700 if ((ini->is_smcd ?
1701 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1702 ini->ism_peer_gid[ini->ism_selected]) :
1703 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1704 !lgr->sync_err &&
1705 (ini->smcd_version == SMC_V2 ||
1706 lgr->vlan_id == ini->vlan_id) &&
1707 (role == SMC_CLNT || ini->is_smcd ||
1708 lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
1709 /* link group found */
1710 ini->first_contact_local = 0;
1711 conn->lgr = lgr;
1712 rc = smc_lgr_register_conn(conn, false);
1713 write_unlock_bh(&lgr->conns_lock);
1714 if (!rc && delayed_work_pending(&lgr->free_work))
1715 cancel_delayed_work(&lgr->free_work);
1716 break;
1717 }
1718 write_unlock_bh(&lgr->conns_lock);
1719 }
1720 spin_unlock_bh(lgr_lock);
1721 if (rc)
1722 return rc;
1723
1724 if (role == SMC_CLNT && !ini->first_contact_peer &&
1725 ini->first_contact_local) {
1726 /* Server reuses a link group, but Client wants to start
1727 * a new one
1728 * send out_of_sync decline, reason synchr. error
1729 */
1730 return SMC_CLC_DECL_SYNCERR;
1731 }
1732
1733 create:
1734 if (ini->first_contact_local) {
1735 rc = smc_lgr_create(smc, ini);
1736 if (rc)
1737 goto out;
1738 lgr = conn->lgr;
1739 write_lock_bh(&lgr->conns_lock);
1740 rc = smc_lgr_register_conn(conn, true);
1741 write_unlock_bh(&lgr->conns_lock);
1742 if (rc)
1743 goto out;
1744 }
1745 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1746 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1747 conn->urg_state = SMC_URG_READ;
1748 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1749 if (ini->is_smcd) {
1750 conn->rx_off = sizeof(struct smcd_cdc_msg);
1751 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1752 } else {
1753 conn->rx_off = 0;
1754 }
1755 #ifndef KERNEL_HAS_ATOMIC64
1756 spin_lock_init(&conn->acurs_lock);
1757 #endif
1758
1759 out:
1760 return rc;
1761 }
1762
1763 /* convert the RMB size into the compressed notation - minimum 16K.
1764 * In contrast to plain ilog2, this rounds towards the next power of 2,
1765 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1766 */
1767 static u8 smc_compress_bufsize(int size)
1768 {
1769 u8 compressed;
1770
1771 if (size <= SMC_BUF_MIN_SIZE)
1772 return 0;
1773
1774 size = (size - 1) >> 14;
1775 compressed = ilog2(size) + 1;
1776 if (compressed >= SMC_RMBE_SIZES)
1777 compressed = SMC_RMBE_SIZES - 1;
1778 return compressed;
1779 }
1780
1781 /* convert the RMB size from compressed notation into integer */
1782 int smc_uncompress_bufsize(u8 compressed)
1783 {
1784 u32 size;
1785
1786 size = 0x00000001 << (((int)compressed) + 14);
1787 return (int)size;
1788 }
1789
1790 /* try to reuse a sndbuf or rmb description slot for a certain
1791 * buffer size; if not available, return NULL
1792 */
1793 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1794 struct mutex *lock,
1795 struct list_head *buf_list)
1796 {
1797 struct smc_buf_desc *buf_slot;
1798
1799 mutex_lock(lock);
1800 list_for_each_entry(buf_slot, buf_list, list) {
1801 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1802 mutex_unlock(lock);
1803 return buf_slot;
1804 }
1805 }
1806 mutex_unlock(lock);
1807 return NULL;
1808 }
1809
1810 /* one of the conditions for announcing a receiver's current window size is
1811 * that it "results in a minimum increase in the window size of 10% of the
1812 * receive buffer space" [RFC7609]
1813 */
1814 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1815 {
1816 return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1817 }
1818
1819 /* map an rmb buf to a link */
1820 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1821 struct smc_link *lnk)
1822 {
1823 int rc;
1824
1825 if (buf_desc->is_map_ib[lnk->link_idx])
1826 return 0;
1827
1828 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1829 if (rc)
1830 return rc;
1831 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1832 buf_desc->cpu_addr, buf_desc->len);
1833
1834 /* map sg table to DMA address */
1835 rc = smc_ib_buf_map_sg(lnk, buf_desc,
1836 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1837 /* SMC protocol depends on mapping to one DMA address only */
1838 if (rc != 1) {
1839 rc = -EAGAIN;
1840 goto free_table;
1841 }
1842
1843 /* create a new memory region for the RMB */
1844 if (is_rmb) {
1845 rc = smc_ib_get_memory_region(lnk->roce_pd,
1846 IB_ACCESS_REMOTE_WRITE |
1847 IB_ACCESS_LOCAL_WRITE,
1848 buf_desc, lnk->link_idx);
1849 if (rc)
1850 goto buf_unmap;
1851 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1852 }
1853 buf_desc->is_map_ib[lnk->link_idx] = true;
1854 return 0;
1855
1856 buf_unmap:
1857 smc_ib_buf_unmap_sg(lnk, buf_desc,
1858 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1859 free_table:
1860 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1861 return rc;
1862 }
1863
1864 /* register a new rmb on IB device,
1865 * must be called under lgr->llc_conf_mutex lock
1866 */
1867 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1868 {
1869 if (list_empty(&link->lgr->list))
1870 return -ENOLINK;
1871 if (!rmb_desc->is_reg_mr[link->link_idx]) {
1872 /* register memory region for new rmb */
1873 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1874 rmb_desc->is_reg_err = true;
1875 return -EFAULT;
1876 }
1877 rmb_desc->is_reg_mr[link->link_idx] = true;
1878 }
1879 return 0;
1880 }
1881
1882 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1883 struct list_head *lst, bool is_rmb)
1884 {
1885 struct smc_buf_desc *buf_desc, *bf;
1886 int rc = 0;
1887
1888 mutex_lock(lock);
1889 list_for_each_entry_safe(buf_desc, bf, lst, list) {
1890 if (!buf_desc->used)
1891 continue;
1892 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1893 if (rc)
1894 goto out;
1895 }
1896 out:
1897 mutex_unlock(lock);
1898 return rc;
1899 }
1900
1901 /* map all used buffers of lgr for a new link */
1902 int smcr_buf_map_lgr(struct smc_link *lnk)
1903 {
1904 struct smc_link_group *lgr = lnk->lgr;
1905 int i, rc = 0;
1906
1907 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1908 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1909 &lgr->rmbs[i], true);
1910 if (rc)
1911 return rc;
1912 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1913 &lgr->sndbufs[i], false);
1914 if (rc)
1915 return rc;
1916 }
1917 return 0;
1918 }
1919
1920 /* register all used buffers of lgr for a new link,
1921 * must be called under lgr->llc_conf_mutex lock
1922 */
1923 int smcr_buf_reg_lgr(struct smc_link *lnk)
1924 {
1925 struct smc_link_group *lgr = lnk->lgr;
1926 struct smc_buf_desc *buf_desc, *bf;
1927 int i, rc = 0;
1928
1929 mutex_lock(&lgr->rmbs_lock);
1930 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1931 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1932 if (!buf_desc->used)
1933 continue;
1934 rc = smcr_link_reg_rmb(lnk, buf_desc);
1935 if (rc)
1936 goto out;
1937 }
1938 }
1939 out:
1940 mutex_unlock(&lgr->rmbs_lock);
1941 return rc;
1942 }
1943
1944 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1945 bool is_rmb, int bufsize)
1946 {
1947 struct smc_buf_desc *buf_desc;
1948
1949 /* try to alloc a new buffer */
1950 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1951 if (!buf_desc)
1952 return ERR_PTR(-ENOMEM);
1953
1954 buf_desc->order = get_order(bufsize);
1955 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1956 __GFP_NOMEMALLOC | __GFP_COMP |
1957 __GFP_NORETRY | __GFP_ZERO,
1958 buf_desc->order);
1959 if (!buf_desc->pages) {
1960 kfree(buf_desc);
1961 return ERR_PTR(-EAGAIN);
1962 }
1963 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1964 buf_desc->len = bufsize;
1965 return buf_desc;
1966 }
1967
1968 /* map buf_desc on all usable links,
1969 * unused buffers stay mapped as long as the link is up
1970 */
1971 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1972 struct smc_buf_desc *buf_desc, bool is_rmb)
1973 {
1974 int i, rc = 0;
1975
1976 /* protect against parallel link reconfiguration */
1977 mutex_lock(&lgr->llc_conf_mutex);
1978 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1979 struct smc_link *lnk = &lgr->lnk[i];
1980
1981 if (!smc_link_usable(lnk))
1982 continue;
1983 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1984 rc = -ENOMEM;
1985 goto out;
1986 }
1987 }
1988 out:
1989 mutex_unlock(&lgr->llc_conf_mutex);
1990 return rc;
1991 }
1992
1993 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1994
1995 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
1996 bool is_dmb, int bufsize)
1997 {
1998 struct smc_buf_desc *buf_desc;
1999 int rc;
2000
2001 if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
2002 return ERR_PTR(-EAGAIN);
2003
2004 /* try to alloc a new DMB */
2005 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2006 if (!buf_desc)
2007 return ERR_PTR(-ENOMEM);
2008 if (is_dmb) {
2009 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2010 if (rc) {
2011 kfree(buf_desc);
2012 if (rc == -ENOMEM)
2013 return ERR_PTR(-EAGAIN);
2014 if (rc == -ENOSPC)
2015 return ERR_PTR(-ENOSPC);
2016 return ERR_PTR(-EIO);
2017 }
2018 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2019 /* CDC header stored in buf. So, pretend it was smaller */
2020 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2021 } else {
2022 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2023 __GFP_NOWARN | __GFP_NORETRY |
2024 __GFP_NOMEMALLOC);
2025 if (!buf_desc->cpu_addr) {
2026 kfree(buf_desc);
2027 return ERR_PTR(-EAGAIN);
2028 }
2029 buf_desc->len = bufsize;
2030 }
2031 return buf_desc;
2032 }
2033
2034 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2035 {
2036 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2037 struct smc_connection *conn = &smc->conn;
2038 struct smc_link_group *lgr = conn->lgr;
2039 struct list_head *buf_list;
2040 int bufsize, bufsize_short;
2041 struct mutex *lock; /* lock buffer list */
2042 int sk_buf_size;
2043
2044 if (is_rmb)
2045 /* use socket recv buffer size (w/o overhead) as start value */
2046 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2047 else
2048 /* use socket send buffer size (w/o overhead) as start value */
2049 sk_buf_size = smc->sk.sk_sndbuf / 2;
2050
2051 for (bufsize_short = smc_compress_bufsize(sk_buf_size);
2052 bufsize_short >= 0; bufsize_short--) {
2053
2054 if (is_rmb) {
2055 lock = &lgr->rmbs_lock;
2056 buf_list = &lgr->rmbs[bufsize_short];
2057 } else {
2058 lock = &lgr->sndbufs_lock;
2059 buf_list = &lgr->sndbufs[bufsize_short];
2060 }
2061 bufsize = smc_uncompress_bufsize(bufsize_short);
2062 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
2063 continue;
2064
2065 /* check for reusable slot in the link group */
2066 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2067 if (buf_desc) {
2068 memset(buf_desc->cpu_addr, 0, bufsize);
2069 break; /* found reusable slot */
2070 }
2071
2072 if (is_smcd)
2073 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2074 else
2075 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2076
2077 if (PTR_ERR(buf_desc) == -ENOMEM)
2078 break;
2079 if (IS_ERR(buf_desc))
2080 continue;
2081
2082 buf_desc->used = 1;
2083 mutex_lock(lock);
2084 list_add(&buf_desc->list, buf_list);
2085 mutex_unlock(lock);
2086 break; /* found */
2087 }
2088
2089 if (IS_ERR(buf_desc))
2090 return PTR_ERR(buf_desc);
2091
2092 if (!is_smcd) {
2093 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2094 smcr_buf_unuse(buf_desc, lgr);
2095 return -ENOMEM;
2096 }
2097 }
2098
2099 if (is_rmb) {
2100 conn->rmb_desc = buf_desc;
2101 conn->rmbe_size_short = bufsize_short;
2102 smc->sk.sk_rcvbuf = bufsize * 2;
2103 atomic_set(&conn->bytes_to_rcv, 0);
2104 conn->rmbe_update_limit =
2105 smc_rmb_wnd_update_limit(buf_desc->len);
2106 if (is_smcd)
2107 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2108 } else {
2109 conn->sndbuf_desc = buf_desc;
2110 smc->sk.sk_sndbuf = bufsize * 2;
2111 atomic_set(&conn->sndbuf_space, bufsize);
2112 }
2113 return 0;
2114 }
2115
2116 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2117 {
2118 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2119 return;
2120 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2121 }
2122
2123 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2124 {
2125 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2126 return;
2127 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2128 }
2129
2130 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2131 {
2132 int i;
2133
2134 if (!conn->lgr || conn->lgr->is_smcd)
2135 return;
2136 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2137 if (!smc_link_active(&conn->lgr->lnk[i]))
2138 continue;
2139 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2140 DMA_FROM_DEVICE);
2141 }
2142 }
2143
2144 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2145 {
2146 int i;
2147
2148 if (!conn->lgr || conn->lgr->is_smcd)
2149 return;
2150 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2151 if (!smc_link_active(&conn->lgr->lnk[i]))
2152 continue;
2153 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2154 DMA_FROM_DEVICE);
2155 }
2156 }
2157
2158 /* create the send and receive buffer for an SMC socket;
2159 * receive buffers are called RMBs;
2160 * (even though the SMC protocol allows more than one RMB-element per RMB,
2161 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2162 * extra RMB for every connection in a link group
2163 */
2164 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2165 {
2166 int rc;
2167
2168 /* create send buffer */
2169 rc = __smc_buf_create(smc, is_smcd, false);
2170 if (rc)
2171 return rc;
2172 /* create rmb */
2173 rc = __smc_buf_create(smc, is_smcd, true);
2174 if (rc) {
2175 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2176 list_del(&smc->conn.sndbuf_desc->list);
2177 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2178 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2179 smc->conn.sndbuf_desc = NULL;
2180 }
2181 return rc;
2182 }
2183
2184 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2185 {
2186 int i;
2187
2188 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2189 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2190 return i;
2191 }
2192 return -ENOSPC;
2193 }
2194
2195 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2196 u32 rkey)
2197 {
2198 int i;
2199
2200 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2201 if (test_bit(i, lgr->rtokens_used_mask) &&
2202 lgr->rtokens[i][lnk_idx].rkey == rkey)
2203 return i;
2204 }
2205 return -ENOENT;
2206 }
2207
2208 /* set rtoken for a new link to an existing rmb */
2209 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2210 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2211 {
2212 int rtok_idx;
2213
2214 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2215 if (rtok_idx == -ENOENT)
2216 return;
2217 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2218 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2219 }
2220
2221 /* set rtoken for a new link whose link_id is given */
2222 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2223 __be64 nw_vaddr, __be32 nw_rkey)
2224 {
2225 u64 dma_addr = be64_to_cpu(nw_vaddr);
2226 u32 rkey = ntohl(nw_rkey);
2227 bool found = false;
2228 int link_idx;
2229
2230 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2231 if (lgr->lnk[link_idx].link_id == link_id) {
2232 found = true;
2233 break;
2234 }
2235 }
2236 if (!found)
2237 return;
2238 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2239 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2240 }
2241
2242 /* add a new rtoken from peer */
2243 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2244 {
2245 struct smc_link_group *lgr = smc_get_lgr(lnk);
2246 u64 dma_addr = be64_to_cpu(nw_vaddr);
2247 u32 rkey = ntohl(nw_rkey);
2248 int i;
2249
2250 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2251 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2252 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2253 test_bit(i, lgr->rtokens_used_mask)) {
2254 /* already in list */
2255 return i;
2256 }
2257 }
2258 i = smc_rmb_reserve_rtoken_idx(lgr);
2259 if (i < 0)
2260 return i;
2261 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2262 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2263 return i;
2264 }
2265
2266 /* delete an rtoken from all links */
2267 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2268 {
2269 struct smc_link_group *lgr = smc_get_lgr(lnk);
2270 u32 rkey = ntohl(nw_rkey);
2271 int i, j;
2272
2273 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2274 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2275 test_bit(i, lgr->rtokens_used_mask)) {
2276 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2277 lgr->rtokens[i][j].rkey = 0;
2278 lgr->rtokens[i][j].dma_addr = 0;
2279 }
2280 clear_bit(i, lgr->rtokens_used_mask);
2281 return 0;
2282 }
2283 }
2284 return -ENOENT;
2285 }
2286
2287 /* save rkey and dma_addr received from peer during clc handshake */
2288 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2289 struct smc_link *lnk,
2290 struct smc_clc_msg_accept_confirm *clc)
2291 {
2292 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2293 clc->r0.rmb_rkey);
2294 if (conn->rtoken_idx < 0)
2295 return conn->rtoken_idx;
2296 return 0;
2297 }
2298
2299 static void smc_core_going_away(void)
2300 {
2301 struct smc_ib_device *smcibdev;
2302 struct smcd_dev *smcd;
2303
2304 mutex_lock(&smc_ib_devices.mutex);
2305 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2306 int i;
2307
2308 for (i = 0; i < SMC_MAX_PORTS; i++)
2309 set_bit(i, smcibdev->ports_going_away);
2310 }
2311 mutex_unlock(&smc_ib_devices.mutex);
2312
2313 mutex_lock(&smcd_dev_list.mutex);
2314 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2315 smcd->going_away = 1;
2316 }
2317 mutex_unlock(&smcd_dev_list.mutex);
2318 }
2319
2320 /* Clean up all SMC link groups */
2321 static void smc_lgrs_shutdown(void)
2322 {
2323 struct smcd_dev *smcd;
2324
2325 smc_core_going_away();
2326
2327 smc_smcr_terminate_all(NULL);
2328
2329 mutex_lock(&smcd_dev_list.mutex);
2330 list_for_each_entry(smcd, &smcd_dev_list.list, list)
2331 smc_smcd_terminate_all(smcd);
2332 mutex_unlock(&smcd_dev_list.mutex);
2333 }
2334
2335 static int smc_core_reboot_event(struct notifier_block *this,
2336 unsigned long event, void *ptr)
2337 {
2338 smc_lgrs_shutdown();
2339 smc_ib_unregister_client();
2340 return 0;
2341 }
2342
2343 static struct notifier_block smc_reboot_notifier = {
2344 .notifier_call = smc_core_reboot_event,
2345 };
2346
2347 int __init smc_core_init(void)
2348 {
2349 return register_reboot_notifier(&smc_reboot_notifier);
2350 }
2351
2352 /* Called (from smc_exit) when module is removed */
2353 void smc_core_exit(void)
2354 {
2355 unregister_reboot_notifier(&smc_reboot_notifier);
2356 smc_lgrs_shutdown();
2357 }
Linux with added FPC-III support