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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#include "smc_stats.h"
37#include "smc_tracepoint.h"
38
39#define SMC_LGR_NUM_INCR 256
40#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
41#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
42
43struct smc_lgr_list smc_lgr_list = { /* established link groups */
44 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
45 .list = LIST_HEAD_INIT(smc_lgr_list.list),
46 .num = 0,
47};
48
49static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
50static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
51
52static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
53 struct smc_buf_desc *buf_desc);
54static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
55
56static void smc_link_down_work(struct work_struct *work);
57
58/* return head of link group list and its lock for a given link group */
59static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
60 spinlock_t **lgr_lock)
61{
62 if (lgr->is_smcd) {
63 *lgr_lock = &lgr->smcd->lgr_lock;
64 return &lgr->smcd->lgr_list;
65 }
66
67 *lgr_lock = &smc_lgr_list.lock;
68 return &smc_lgr_list.list;
69}
70
71static void smc_ibdev_cnt_inc(struct smc_link *lnk)
72{
73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
74}
75
76static void smc_ibdev_cnt_dec(struct smc_link *lnk)
77{
78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
79}
80
81static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
82{
83 /* client link group creation always follows the server link group
84 * creation. For client use a somewhat higher removal delay time,
85 * otherwise there is a risk of out-of-sync link groups.
86 */
87 if (!lgr->freeing) {
88 mod_delayed_work(system_wq, &lgr->free_work,
89 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
90 SMC_LGR_FREE_DELAY_CLNT :
91 SMC_LGR_FREE_DELAY_SERV);
92 }
93}
94
95/* Register connection's alert token in our lookup structure.
96 * To use rbtrees we have to implement our own insert core.
97 * Requires @conns_lock
98 * @smc connection to register
99 * Returns 0 on success, != otherwise.
100 */
101static void smc_lgr_add_alert_token(struct smc_connection *conn)
102{
103 struct rb_node **link, *parent = NULL;
104 u32 token = conn->alert_token_local;
105
106 link = &conn->lgr->conns_all.rb_node;
107 while (*link) {
108 struct smc_connection *cur = rb_entry(*link,
109 struct smc_connection, alert_node);
110
111 parent = *link;
112 if (cur->alert_token_local > token)
113 link = &parent->rb_left;
114 else
115 link = &parent->rb_right;
116 }
117 /* Put the new node there */
118 rb_link_node(&conn->alert_node, parent, link);
119 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
120}
121
122/* assign an SMC-R link to the connection */
123static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
124{
125 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
126 SMC_LNK_ACTIVE;
127 int i, j;
128
129 /* do link balancing */
130 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
131 struct smc_link *lnk = &conn->lgr->lnk[i];
132
133 if (lnk->state != expected || lnk->link_is_asym)
134 continue;
135 if (conn->lgr->role == SMC_CLNT) {
136 conn->lnk = lnk; /* temporary, SMC server assigns link*/
137 break;
138 }
139 if (conn->lgr->conns_num % 2) {
140 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
141 struct smc_link *lnk2;
142
143 lnk2 = &conn->lgr->lnk[j];
144 if (lnk2->state == expected &&
145 !lnk2->link_is_asym) {
146 conn->lnk = lnk2;
147 break;
148 }
149 }
150 }
151 if (!conn->lnk)
152 conn->lnk = lnk;
153 break;
154 }
155 if (!conn->lnk)
156 return SMC_CLC_DECL_NOACTLINK;
157 atomic_inc(&conn->lnk->conn_cnt);
158 return 0;
159}
160
161/* Register connection in link group by assigning an alert token
162 * registered in a search tree.
163 * Requires @conns_lock
164 * Note that '0' is a reserved value and not assigned.
165 */
166static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
167{
168 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
169 static atomic_t nexttoken = ATOMIC_INIT(0);
170 int rc;
171
172 if (!conn->lgr->is_smcd) {
173 rc = smcr_lgr_conn_assign_link(conn, first);
174 if (rc) {
175 conn->lgr = NULL;
176 return rc;
177 }
178 }
179 /* find a new alert_token_local value not yet used by some connection
180 * in this link group
181 */
182 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
183 while (!conn->alert_token_local) {
184 conn->alert_token_local = atomic_inc_return(&nexttoken);
185 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
186 conn->alert_token_local = 0;
187 }
188 smc_lgr_add_alert_token(conn);
189 conn->lgr->conns_num++;
190 return 0;
191}
192
193/* Unregister connection and reset the alert token of the given connection<
194 */
195static void __smc_lgr_unregister_conn(struct smc_connection *conn)
196{
197 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
198 struct smc_link_group *lgr = conn->lgr;
199
200 rb_erase(&conn->alert_node, &lgr->conns_all);
201 if (conn->lnk)
202 atomic_dec(&conn->lnk->conn_cnt);
203 lgr->conns_num--;
204 conn->alert_token_local = 0;
205 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
206}
207
208/* Unregister connection from lgr
209 */
210static void smc_lgr_unregister_conn(struct smc_connection *conn)
211{
212 struct smc_link_group *lgr = conn->lgr;
213
214 if (!smc_conn_lgr_valid(conn))
215 return;
216 write_lock_bh(&lgr->conns_lock);
217 if (conn->alert_token_local) {
218 __smc_lgr_unregister_conn(conn);
219 }
220 write_unlock_bh(&lgr->conns_lock);
221}
222
223int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
224{
225 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
226 char hostname[SMC_MAX_HOSTNAME_LEN + 1];
227 char smc_seid[SMC_MAX_EID_LEN + 1];
228 struct nlattr *attrs;
229 u8 *seid = NULL;
230 u8 *host = NULL;
231 void *nlh;
232
233 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
234 &smc_gen_nl_family, NLM_F_MULTI,
235 SMC_NETLINK_GET_SYS_INFO);
236 if (!nlh)
237 goto errmsg;
238 if (cb_ctx->pos[0])
239 goto errout;
240 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
241 if (!attrs)
242 goto errout;
243 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
244 goto errattr;
245 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
246 goto errattr;
247 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
248 goto errattr;
249 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true))
250 goto errattr;
251 smc_clc_get_hostname(&host);
252 if (host) {
253 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
254 hostname[SMC_MAX_HOSTNAME_LEN] = 0;
255 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
256 goto errattr;
257 }
258 if (smc_ism_is_v2_capable()) {
259 smc_ism_get_system_eid(&seid);
260 memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
261 smc_seid[SMC_MAX_EID_LEN] = 0;
262 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
263 goto errattr;
264 }
265 nla_nest_end(skb, attrs);
266 genlmsg_end(skb, nlh);
267 cb_ctx->pos[0] = 1;
268 return skb->len;
269
270errattr:
271 nla_nest_cancel(skb, attrs);
272errout:
273 genlmsg_cancel(skb, nlh);
274errmsg:
275 return skb->len;
276}
277
278/* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */
279static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr,
280 struct sk_buff *skb,
281 struct netlink_callback *cb,
282 struct nlattr *v2_attrs)
283{
284 char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
285 char smc_eid[SMC_MAX_EID_LEN + 1];
286
287 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
288 goto errv2attr;
289 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
290 goto errv2attr;
291 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
292 goto errv2attr;
293 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
294 smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
295 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
296 goto errv2attr;
297 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
298 smc_eid[SMC_MAX_EID_LEN] = 0;
299 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
300 goto errv2attr;
301
302 nla_nest_end(skb, v2_attrs);
303 return 0;
304
305errv2attr:
306 nla_nest_cancel(skb, v2_attrs);
307 return -EMSGSIZE;
308}
309
310static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr,
311 struct sk_buff *skb,
312 struct netlink_callback *cb)
313{
314 struct nlattr *v2_attrs;
315
316 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2);
317 if (!v2_attrs)
318 goto errattr;
319 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway))
320 goto errv2attr;
321
322 nla_nest_end(skb, v2_attrs);
323 return 0;
324
325errv2attr:
326 nla_nest_cancel(skb, v2_attrs);
327errattr:
328 return -EMSGSIZE;
329}
330
331static int smc_nl_fill_lgr(struct smc_link_group *lgr,
332 struct sk_buff *skb,
333 struct netlink_callback *cb)
334{
335 char smc_target[SMC_MAX_PNETID_LEN + 1];
336 struct nlattr *attrs, *v2_attrs;
337
338 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
339 if (!attrs)
340 goto errout;
341
342 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
343 goto errattr;
344 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
345 goto errattr;
346 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
347 goto errattr;
348 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
349 goto errattr;
350 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type))
351 goto errattr;
352 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
353 goto errattr;
354 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE,
355 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD))
356 goto errattr;
357 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
358 smc_target[SMC_MAX_PNETID_LEN] = 0;
359 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
360 goto errattr;
361 if (lgr->smc_version > SMC_V1) {
362 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON);
363 if (!v2_attrs)
364 goto errattr;
365 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
366 goto errattr;
367 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb))
368 goto errattr;
369 }
370
371 nla_nest_end(skb, attrs);
372 return 0;
373errattr:
374 nla_nest_cancel(skb, attrs);
375errout:
376 return -EMSGSIZE;
377}
378
379static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
380 struct smc_link *link,
381 struct sk_buff *skb,
382 struct netlink_callback *cb)
383{
384 char smc_ibname[IB_DEVICE_NAME_MAX];
385 u8 smc_gid_target[41];
386 struct nlattr *attrs;
387 u32 link_uid = 0;
388 void *nlh;
389
390 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
391 &smc_gen_nl_family, NLM_F_MULTI,
392 SMC_NETLINK_GET_LINK_SMCR);
393 if (!nlh)
394 goto errmsg;
395
396 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
397 if (!attrs)
398 goto errout;
399
400 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
401 goto errattr;
402 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
403 goto errattr;
404 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
405 atomic_read(&link->conn_cnt)))
406 goto errattr;
407 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
408 goto errattr;
409 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
410 goto errattr;
411 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
412 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
413 goto errattr;
414 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
415 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
416 goto errattr;
417 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
418 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
419 goto errattr;
420 memset(smc_gid_target, 0, sizeof(smc_gid_target));
421 smc_gid_be16_convert(smc_gid_target, link->gid);
422 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
423 goto errattr;
424 memset(smc_gid_target, 0, sizeof(smc_gid_target));
425 smc_gid_be16_convert(smc_gid_target, link->peer_gid);
426 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
427 goto errattr;
428
429 nla_nest_end(skb, attrs);
430 genlmsg_end(skb, nlh);
431 return 0;
432errattr:
433 nla_nest_cancel(skb, attrs);
434errout:
435 genlmsg_cancel(skb, nlh);
436errmsg:
437 return -EMSGSIZE;
438}
439
440static int smc_nl_handle_lgr(struct smc_link_group *lgr,
441 struct sk_buff *skb,
442 struct netlink_callback *cb,
443 bool list_links)
444{
445 void *nlh;
446 int i;
447
448 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
449 &smc_gen_nl_family, NLM_F_MULTI,
450 SMC_NETLINK_GET_LGR_SMCR);
451 if (!nlh)
452 goto errmsg;
453 if (smc_nl_fill_lgr(lgr, skb, cb))
454 goto errout;
455
456 genlmsg_end(skb, nlh);
457 if (!list_links)
458 goto out;
459 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
460 if (!smc_link_usable(&lgr->lnk[i]))
461 continue;
462 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
463 goto errout;
464 }
465out:
466 return 0;
467
468errout:
469 genlmsg_cancel(skb, nlh);
470errmsg:
471 return -EMSGSIZE;
472}
473
474static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
475 struct sk_buff *skb,
476 struct netlink_callback *cb,
477 bool list_links)
478{
479 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
480 struct smc_link_group *lgr;
481 int snum = cb_ctx->pos[0];
482 int num = 0;
483
484 spin_lock_bh(&smc_lgr->lock);
485 list_for_each_entry(lgr, &smc_lgr->list, list) {
486 if (num < snum)
487 goto next;
488 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
489 goto errout;
490next:
491 num++;
492 }
493errout:
494 spin_unlock_bh(&smc_lgr->lock);
495 cb_ctx->pos[0] = num;
496}
497
498static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
499 struct sk_buff *skb,
500 struct netlink_callback *cb)
501{
502 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
503 struct nlattr *attrs;
504 void *nlh;
505
506 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
507 &smc_gen_nl_family, NLM_F_MULTI,
508 SMC_NETLINK_GET_LGR_SMCD);
509 if (!nlh)
510 goto errmsg;
511
512 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
513 if (!attrs)
514 goto errout;
515
516 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
517 goto errattr;
518 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
519 SMC_NLA_LGR_D_PAD))
520 goto errattr;
521 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
522 SMC_NLA_LGR_D_PAD))
523 goto errattr;
524 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
525 goto errattr;
526 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
527 goto errattr;
528 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
529 goto errattr;
530 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
531 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
532 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
533 goto errattr;
534 if (lgr->smc_version > SMC_V1) {
535 struct nlattr *v2_attrs;
536
537 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON);
538 if (!v2_attrs)
539 goto errattr;
540 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
541 goto errattr;
542 }
543 nla_nest_end(skb, attrs);
544 genlmsg_end(skb, nlh);
545 return 0;
546
547errattr:
548 nla_nest_cancel(skb, attrs);
549errout:
550 genlmsg_cancel(skb, nlh);
551errmsg:
552 return -EMSGSIZE;
553}
554
555static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
556 struct sk_buff *skb,
557 struct netlink_callback *cb)
558{
559 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
560 struct smc_link_group *lgr;
561 int snum = cb_ctx->pos[1];
562 int rc = 0, num = 0;
563
564 spin_lock_bh(&dev->lgr_lock);
565 list_for_each_entry(lgr, &dev->lgr_list, list) {
566 if (!lgr->is_smcd)
567 continue;
568 if (num < snum)
569 goto next;
570 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
571 if (rc)
572 goto errout;
573next:
574 num++;
575 }
576errout:
577 spin_unlock_bh(&dev->lgr_lock);
578 cb_ctx->pos[1] = num;
579 return rc;
580}
581
582static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
583 struct sk_buff *skb,
584 struct netlink_callback *cb)
585{
586 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
587 struct smcd_dev *smcd_dev;
588 int snum = cb_ctx->pos[0];
589 int rc = 0, num = 0;
590
591 mutex_lock(&dev_list->mutex);
592 list_for_each_entry(smcd_dev, &dev_list->list, list) {
593 if (list_empty(&smcd_dev->lgr_list))
594 continue;
595 if (num < snum)
596 goto next;
597 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
598 if (rc)
599 goto errout;
600next:
601 num++;
602 }
603errout:
604 mutex_unlock(&dev_list->mutex);
605 cb_ctx->pos[0] = num;
606 return rc;
607}
608
609int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
610{
611 bool list_links = false;
612
613 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
614 return skb->len;
615}
616
617int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
618{
619 bool list_links = true;
620
621 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
622 return skb->len;
623}
624
625int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
626{
627 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
628 return skb->len;
629}
630
631void smc_lgr_cleanup_early(struct smc_link_group *lgr)
632{
633 spinlock_t *lgr_lock;
634
635 if (!lgr)
636 return;
637
638 smc_lgr_list_head(lgr, &lgr_lock);
639 spin_lock_bh(lgr_lock);
640 /* do not use this link group for new connections */
641 if (!list_empty(&lgr->list))
642 list_del_init(&lgr->list);
643 spin_unlock_bh(lgr_lock);
644 __smc_lgr_terminate(lgr, true);
645}
646
647static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
648{
649 int i;
650
651 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
652 struct smc_link *lnk = &lgr->lnk[i];
653
654 if (smc_link_sendable(lnk))
655 lnk->state = SMC_LNK_INACTIVE;
656 }
657 wake_up_all(&lgr->llc_msg_waiter);
658 wake_up_all(&lgr->llc_flow_waiter);
659}
660
661static void smc_lgr_free(struct smc_link_group *lgr);
662
663static void smc_lgr_free_work(struct work_struct *work)
664{
665 struct smc_link_group *lgr = container_of(to_delayed_work(work),
666 struct smc_link_group,
667 free_work);
668 spinlock_t *lgr_lock;
669 bool conns;
670
671 smc_lgr_list_head(lgr, &lgr_lock);
672 spin_lock_bh(lgr_lock);
673 if (lgr->freeing) {
674 spin_unlock_bh(lgr_lock);
675 return;
676 }
677 read_lock_bh(&lgr->conns_lock);
678 conns = RB_EMPTY_ROOT(&lgr->conns_all);
679 read_unlock_bh(&lgr->conns_lock);
680 if (!conns) { /* number of lgr connections is no longer zero */
681 spin_unlock_bh(lgr_lock);
682 return;
683 }
684 list_del_init(&lgr->list); /* remove from smc_lgr_list */
685 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
686 spin_unlock_bh(lgr_lock);
687 cancel_delayed_work(&lgr->free_work);
688
689 if (!lgr->is_smcd && !lgr->terminating)
690 smc_llc_send_link_delete_all(lgr, true,
691 SMC_LLC_DEL_PROG_INIT_TERM);
692 if (lgr->is_smcd && !lgr->terminating)
693 smc_ism_signal_shutdown(lgr);
694 if (!lgr->is_smcd)
695 smcr_lgr_link_deactivate_all(lgr);
696 smc_lgr_free(lgr);
697}
698
699static void smc_lgr_terminate_work(struct work_struct *work)
700{
701 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
702 terminate_work);
703
704 __smc_lgr_terminate(lgr, true);
705}
706
707/* return next unique link id for the lgr */
708static u8 smcr_next_link_id(struct smc_link_group *lgr)
709{
710 u8 link_id;
711 int i;
712
713 while (1) {
714again:
715 link_id = ++lgr->next_link_id;
716 if (!link_id) /* skip zero as link_id */
717 link_id = ++lgr->next_link_id;
718 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
719 if (smc_link_usable(&lgr->lnk[i]) &&
720 lgr->lnk[i].link_id == link_id)
721 goto again;
722 }
723 break;
724 }
725 return link_id;
726}
727
728static void smcr_copy_dev_info_to_link(struct smc_link *link)
729{
730 struct smc_ib_device *smcibdev = link->smcibdev;
731
732 snprintf(link->ibname, sizeof(link->ibname), "%s",
733 smcibdev->ibdev->name);
734 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
735}
736
737int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
738 u8 link_idx, struct smc_init_info *ini)
739{
740 struct smc_ib_device *smcibdev;
741 u8 rndvec[3];
742 int rc;
743
744 if (lgr->smc_version == SMC_V2) {
745 lnk->smcibdev = ini->smcrv2.ib_dev_v2;
746 lnk->ibport = ini->smcrv2.ib_port_v2;
747 } else {
748 lnk->smcibdev = ini->ib_dev;
749 lnk->ibport = ini->ib_port;
750 }
751 get_device(&lnk->smcibdev->ibdev->dev);
752 atomic_inc(&lnk->smcibdev->lnk_cnt);
753 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */
754 lnk->clearing = 0;
755 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu;
756 lnk->link_id = smcr_next_link_id(lgr);
757 lnk->lgr = lgr;
758 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */
759 lnk->link_idx = link_idx;
760 lnk->wr_rx_id_compl = 0;
761 smc_ibdev_cnt_inc(lnk);
762 smcr_copy_dev_info_to_link(lnk);
763 atomic_set(&lnk->conn_cnt, 0);
764 smc_llc_link_set_uid(lnk);
765 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
766 if (!lnk->smcibdev->initialized) {
767 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev);
768 if (rc)
769 goto out;
770 }
771 get_random_bytes(rndvec, sizeof(rndvec));
772 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
773 (rndvec[2] << 16);
774 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
775 ini->vlan_id, lnk->gid, &lnk->sgid_index,
776 lgr->smc_version == SMC_V2 ?
777 &ini->smcrv2 : NULL);
778 if (rc)
779 goto out;
780 rc = smc_llc_link_init(lnk);
781 if (rc)
782 goto out;
783 rc = smc_wr_alloc_link_mem(lnk);
784 if (rc)
785 goto clear_llc_lnk;
786 rc = smc_ib_create_protection_domain(lnk);
787 if (rc)
788 goto free_link_mem;
789 rc = smc_ib_create_queue_pair(lnk);
790 if (rc)
791 goto dealloc_pd;
792 rc = smc_wr_create_link(lnk);
793 if (rc)
794 goto destroy_qp;
795 lnk->state = SMC_LNK_ACTIVATING;
796 return 0;
797
798destroy_qp:
799 smc_ib_destroy_queue_pair(lnk);
800dealloc_pd:
801 smc_ib_dealloc_protection_domain(lnk);
802free_link_mem:
803 smc_wr_free_link_mem(lnk);
804clear_llc_lnk:
805 smc_llc_link_clear(lnk, false);
806out:
807 smc_ibdev_cnt_dec(lnk);
808 put_device(&lnk->smcibdev->ibdev->dev);
809 smcibdev = lnk->smcibdev;
810 memset(lnk, 0, sizeof(struct smc_link));
811 lnk->state = SMC_LNK_UNUSED;
812 if (!atomic_dec_return(&smcibdev->lnk_cnt))
813 wake_up(&smcibdev->lnks_deleted);
814 smc_lgr_put(lgr); /* lgr_hold above */
815 return rc;
816}
817
818/* create a new SMC link group */
819static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
820{
821 struct smc_link_group *lgr;
822 struct list_head *lgr_list;
823 struct smc_link *lnk;
824 spinlock_t *lgr_lock;
825 u8 link_idx;
826 int rc = 0;
827 int i;
828
829 if (ini->is_smcd && ini->vlan_id) {
830 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
831 ini->vlan_id)) {
832 rc = SMC_CLC_DECL_ISMVLANERR;
833 goto out;
834 }
835 }
836
837 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
838 if (!lgr) {
839 rc = SMC_CLC_DECL_MEM;
840 goto ism_put_vlan;
841 }
842 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
843 SMC_LGR_ID_SIZE, &lgr->id);
844 if (!lgr->tx_wq) {
845 rc = -ENOMEM;
846 goto free_lgr;
847 }
848 lgr->is_smcd = ini->is_smcd;
849 lgr->sync_err = 0;
850 lgr->terminating = 0;
851 lgr->freeing = 0;
852 lgr->vlan_id = ini->vlan_id;
853 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */
854 mutex_init(&lgr->sndbufs_lock);
855 mutex_init(&lgr->rmbs_lock);
856 rwlock_init(&lgr->conns_lock);
857 for (i = 0; i < SMC_RMBE_SIZES; i++) {
858 INIT_LIST_HEAD(&lgr->sndbufs[i]);
859 INIT_LIST_HEAD(&lgr->rmbs[i]);
860 }
861 lgr->next_link_id = 0;
862 smc_lgr_list.num += SMC_LGR_NUM_INCR;
863 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
864 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
865 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
866 lgr->conns_all = RB_ROOT;
867 if (ini->is_smcd) {
868 /* SMC-D specific settings */
869 get_device(&ini->ism_dev[ini->ism_selected]->dev);
870 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
871 lgr->smcd = ini->ism_dev[ini->ism_selected];
872 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
873 lgr_lock = &lgr->smcd->lgr_lock;
874 lgr->smc_version = ini->smcd_version;
875 lgr->peer_shutdown = 0;
876 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
877 } else {
878 /* SMC-R specific settings */
879 struct smc_ib_device *ibdev;
880 int ibport;
881
882 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
883 lgr->smc_version = ini->smcr_version;
884 memcpy(lgr->peer_systemid, ini->peer_systemid,
885 SMC_SYSTEMID_LEN);
886 if (lgr->smc_version == SMC_V2) {
887 ibdev = ini->smcrv2.ib_dev_v2;
888 ibport = ini->smcrv2.ib_port_v2;
889 lgr->saddr = ini->smcrv2.saddr;
890 lgr->uses_gateway = ini->smcrv2.uses_gateway;
891 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac,
892 ETH_ALEN);
893 } else {
894 ibdev = ini->ib_dev;
895 ibport = ini->ib_port;
896 }
897 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1],
898 SMC_MAX_PNETID_LEN);
899 rc = smc_wr_alloc_lgr_mem(lgr);
900 if (rc)
901 goto free_wq;
902 smc_llc_lgr_init(lgr, smc);
903
904 link_idx = SMC_SINGLE_LINK;
905 lnk = &lgr->lnk[link_idx];
906 rc = smcr_link_init(lgr, lnk, link_idx, ini);
907 if (rc) {
908 smc_wr_free_lgr_mem(lgr);
909 goto free_wq;
910 }
911 lgr->net = smc_ib_net(lnk->smcibdev);
912 lgr_list = &smc_lgr_list.list;
913 lgr_lock = &smc_lgr_list.lock;
914 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type;
915 atomic_inc(&lgr_cnt);
916 }
917 smc->conn.lgr = lgr;
918 spin_lock_bh(lgr_lock);
919 list_add_tail(&lgr->list, lgr_list);
920 spin_unlock_bh(lgr_lock);
921 return 0;
922
923free_wq:
924 destroy_workqueue(lgr->tx_wq);
925free_lgr:
926 kfree(lgr);
927ism_put_vlan:
928 if (ini->is_smcd && ini->vlan_id)
929 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
930out:
931 if (rc < 0) {
932 if (rc == -ENOMEM)
933 rc = SMC_CLC_DECL_MEM;
934 else
935 rc = SMC_CLC_DECL_INTERR;
936 }
937 return rc;
938}
939
940static int smc_write_space(struct smc_connection *conn)
941{
942 int buffer_len = conn->peer_rmbe_size;
943 union smc_host_cursor prod;
944 union smc_host_cursor cons;
945 int space;
946
947 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
948 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
949 /* determine rx_buf space */
950 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
951 return space;
952}
953
954static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
955 struct smc_wr_buf *wr_buf)
956{
957 struct smc_connection *conn = &smc->conn;
958 union smc_host_cursor cons, fin;
959 int rc = 0;
960 int diff;
961
962 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
963 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
964 /* set prod cursor to old state, enforce tx_rdma_writes() */
965 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
966 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
967
968 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
969 /* cons cursor advanced more than fin, and prod was set
970 * fin above, so now prod is smaller than cons. Fix that.
971 */
972 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
973 smc_curs_add(conn->sndbuf_desc->len,
974 &conn->tx_curs_sent, diff);
975 smc_curs_add(conn->sndbuf_desc->len,
976 &conn->tx_curs_fin, diff);
977
978 smp_mb__before_atomic();
979 atomic_add(diff, &conn->sndbuf_space);
980 smp_mb__after_atomic();
981
982 smc_curs_add(conn->peer_rmbe_size,
983 &conn->local_tx_ctrl.prod, diff);
984 smc_curs_add(conn->peer_rmbe_size,
985 &conn->local_tx_ctrl_fin, diff);
986 }
987 /* recalculate, value is used by tx_rdma_writes() */
988 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
989
990 if (smc->sk.sk_state != SMC_INIT &&
991 smc->sk.sk_state != SMC_CLOSED) {
992 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
993 if (!rc) {
994 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
995 smc->sk.sk_data_ready(&smc->sk);
996 }
997 } else {
998 smc_wr_tx_put_slot(conn->lnk,
999 (struct smc_wr_tx_pend_priv *)pend);
1000 }
1001 return rc;
1002}
1003
1004void smc_switch_link_and_count(struct smc_connection *conn,
1005 struct smc_link *to_lnk)
1006{
1007 atomic_dec(&conn->lnk->conn_cnt);
1008 /* link_hold in smc_conn_create() */
1009 smcr_link_put(conn->lnk);
1010 conn->lnk = to_lnk;
1011 atomic_inc(&conn->lnk->conn_cnt);
1012 /* link_put in smc_conn_free() */
1013 smcr_link_hold(conn->lnk);
1014}
1015
1016struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
1017 struct smc_link *from_lnk, bool is_dev_err)
1018{
1019 struct smc_link *to_lnk = NULL;
1020 struct smc_cdc_tx_pend *pend;
1021 struct smc_connection *conn;
1022 struct smc_wr_buf *wr_buf;
1023 struct smc_sock *smc;
1024 struct rb_node *node;
1025 int i, rc = 0;
1026
1027 /* link is inactive, wake up tx waiters */
1028 smc_wr_wakeup_tx_wait(from_lnk);
1029
1030 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1031 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
1032 continue;
1033 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
1034 from_lnk->ibport == lgr->lnk[i].ibport) {
1035 continue;
1036 }
1037 to_lnk = &lgr->lnk[i];
1038 break;
1039 }
1040 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) {
1041 smc_lgr_terminate_sched(lgr);
1042 return NULL;
1043 }
1044again:
1045 read_lock_bh(&lgr->conns_lock);
1046 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
1047 conn = rb_entry(node, struct smc_connection, alert_node);
1048 if (conn->lnk != from_lnk)
1049 continue;
1050 smc = container_of(conn, struct smc_sock, conn);
1051 /* conn->lnk not yet set in SMC_INIT state */
1052 if (smc->sk.sk_state == SMC_INIT)
1053 continue;
1054 if (smc->sk.sk_state == SMC_CLOSED ||
1055 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
1056 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
1057 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
1058 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
1059 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
1060 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
1061 smc->sk.sk_state == SMC_PEERABORTWAIT ||
1062 smc->sk.sk_state == SMC_PROCESSABORT) {
1063 spin_lock_bh(&conn->send_lock);
1064 smc_switch_link_and_count(conn, to_lnk);
1065 spin_unlock_bh(&conn->send_lock);
1066 continue;
1067 }
1068 sock_hold(&smc->sk);
1069 read_unlock_bh(&lgr->conns_lock);
1070 /* pre-fetch buffer outside of send_lock, might sleep */
1071 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
1072 if (rc)
1073 goto err_out;
1074 /* avoid race with smcr_tx_sndbuf_nonempty() */
1075 spin_lock_bh(&conn->send_lock);
1076 smc_switch_link_and_count(conn, to_lnk);
1077 rc = smc_switch_cursor(smc, pend, wr_buf);
1078 spin_unlock_bh(&conn->send_lock);
1079 sock_put(&smc->sk);
1080 if (rc)
1081 goto err_out;
1082 goto again;
1083 }
1084 read_unlock_bh(&lgr->conns_lock);
1085 smc_wr_tx_link_put(to_lnk);
1086 return to_lnk;
1087
1088err_out:
1089 smcr_link_down_cond_sched(to_lnk);
1090 smc_wr_tx_link_put(to_lnk);
1091 return NULL;
1092}
1093
1094static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb,
1095 struct smc_link_group *lgr)
1096{
1097 struct mutex *lock; /* lock buffer list */
1098 int rc;
1099
1100 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1101 /* unregister rmb with peer */
1102 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1103 if (!rc) {
1104 /* protect against smc_llc_cli_rkey_exchange() */
1105 mutex_lock(&lgr->llc_conf_mutex);
1106 smc_llc_do_delete_rkey(lgr, buf_desc);
1107 buf_desc->is_conf_rkey = false;
1108 mutex_unlock(&lgr->llc_conf_mutex);
1109 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1110 }
1111 }
1112
1113 if (buf_desc->is_reg_err) {
1114 /* buf registration failed, reuse not possible */
1115 lock = is_rmb ? &lgr->rmbs_lock :
1116 &lgr->sndbufs_lock;
1117 mutex_lock(lock);
1118 list_del(&buf_desc->list);
1119 mutex_unlock(lock);
1120
1121 smc_buf_free(lgr, is_rmb, buf_desc);
1122 } else {
1123 buf_desc->used = 0;
1124 memset(buf_desc->cpu_addr, 0, buf_desc->len);
1125 }
1126}
1127
1128static void smc_buf_unuse(struct smc_connection *conn,
1129 struct smc_link_group *lgr)
1130{
1131 if (conn->sndbuf_desc) {
1132 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) {
1133 smcr_buf_unuse(conn->sndbuf_desc, false, lgr);
1134 } else {
1135 conn->sndbuf_desc->used = 0;
1136 memset(conn->sndbuf_desc->cpu_addr, 0,
1137 conn->sndbuf_desc->len);
1138 }
1139 }
1140 if (conn->rmb_desc) {
1141 if (!lgr->is_smcd) {
1142 smcr_buf_unuse(conn->rmb_desc, true, lgr);
1143 } else {
1144 conn->rmb_desc->used = 0;
1145 memset(conn->rmb_desc->cpu_addr, 0,
1146 conn->rmb_desc->len +
1147 sizeof(struct smcd_cdc_msg));
1148 }
1149 }
1150}
1151
1152/* remove a finished connection from its link group */
1153void smc_conn_free(struct smc_connection *conn)
1154{
1155 struct smc_link_group *lgr = conn->lgr;
1156
1157 if (!lgr || conn->freed)
1158 /* Connection has never been registered in a
1159 * link group, or has already been freed.
1160 */
1161 return;
1162
1163 conn->freed = 1;
1164 if (!smc_conn_lgr_valid(conn))
1165 /* Connection has already unregistered from
1166 * link group.
1167 */
1168 goto lgr_put;
1169
1170 if (lgr->is_smcd) {
1171 if (!list_empty(&lgr->list))
1172 smc_ism_unset_conn(conn);
1173 tasklet_kill(&conn->rx_tsklet);
1174 } else {
1175 smc_cdc_wait_pend_tx_wr(conn);
1176 if (current_work() != &conn->abort_work)
1177 cancel_work_sync(&conn->abort_work);
1178 }
1179 if (!list_empty(&lgr->list)) {
1180 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1181 smc_lgr_unregister_conn(conn);
1182 }
1183
1184 if (!lgr->conns_num)
1185 smc_lgr_schedule_free_work(lgr);
1186lgr_put:
1187 if (!lgr->is_smcd)
1188 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */
1189 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */
1190}
1191
1192/* unregister a link from a buf_desc */
1193static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1194 struct smc_link *lnk)
1195{
1196 if (is_rmb || buf_desc->is_vm)
1197 buf_desc->is_reg_mr[lnk->link_idx] = false;
1198 if (!buf_desc->is_map_ib[lnk->link_idx])
1199 return;
1200
1201 if ((is_rmb || buf_desc->is_vm) &&
1202 buf_desc->mr[lnk->link_idx]) {
1203 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]);
1204 buf_desc->mr[lnk->link_idx] = NULL;
1205 }
1206 if (is_rmb)
1207 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1208 else
1209 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1210
1211 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1212 buf_desc->is_map_ib[lnk->link_idx] = false;
1213}
1214
1215/* unmap all buffers of lgr for a deleted link */
1216static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1217{
1218 struct smc_link_group *lgr = lnk->lgr;
1219 struct smc_buf_desc *buf_desc, *bf;
1220 int i;
1221
1222 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1223 mutex_lock(&lgr->rmbs_lock);
1224 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1225 smcr_buf_unmap_link(buf_desc, true, lnk);
1226 mutex_unlock(&lgr->rmbs_lock);
1227 mutex_lock(&lgr->sndbufs_lock);
1228 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1229 list)
1230 smcr_buf_unmap_link(buf_desc, false, lnk);
1231 mutex_unlock(&lgr->sndbufs_lock);
1232 }
1233}
1234
1235static void smcr_rtoken_clear_link(struct smc_link *lnk)
1236{
1237 struct smc_link_group *lgr = lnk->lgr;
1238 int i;
1239
1240 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1241 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1242 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1243 }
1244}
1245
1246static void __smcr_link_clear(struct smc_link *lnk)
1247{
1248 struct smc_link_group *lgr = lnk->lgr;
1249 struct smc_ib_device *smcibdev;
1250
1251 smc_wr_free_link_mem(lnk);
1252 smc_ibdev_cnt_dec(lnk);
1253 put_device(&lnk->smcibdev->ibdev->dev);
1254 smcibdev = lnk->smcibdev;
1255 memset(lnk, 0, sizeof(struct smc_link));
1256 lnk->state = SMC_LNK_UNUSED;
1257 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1258 wake_up(&smcibdev->lnks_deleted);
1259 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */
1260}
1261
1262/* must be called under lgr->llc_conf_mutex lock */
1263void smcr_link_clear(struct smc_link *lnk, bool log)
1264{
1265 if (!lnk->lgr || lnk->clearing ||
1266 lnk->state == SMC_LNK_UNUSED)
1267 return;
1268 lnk->clearing = 1;
1269 lnk->peer_qpn = 0;
1270 smc_llc_link_clear(lnk, log);
1271 smcr_buf_unmap_lgr(lnk);
1272 smcr_rtoken_clear_link(lnk);
1273 smc_ib_modify_qp_error(lnk);
1274 smc_wr_free_link(lnk);
1275 smc_ib_destroy_queue_pair(lnk);
1276 smc_ib_dealloc_protection_domain(lnk);
1277 smcr_link_put(lnk); /* theoretically last link_put */
1278}
1279
1280void smcr_link_hold(struct smc_link *lnk)
1281{
1282 refcount_inc(&lnk->refcnt);
1283}
1284
1285void smcr_link_put(struct smc_link *lnk)
1286{
1287 if (refcount_dec_and_test(&lnk->refcnt))
1288 __smcr_link_clear(lnk);
1289}
1290
1291static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1292 struct smc_buf_desc *buf_desc)
1293{
1294 int i;
1295
1296 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1297 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1298
1299 if (!buf_desc->is_vm && buf_desc->pages)
1300 __free_pages(buf_desc->pages, buf_desc->order);
1301 else if (buf_desc->is_vm && buf_desc->cpu_addr)
1302 vfree(buf_desc->cpu_addr);
1303 kfree(buf_desc);
1304}
1305
1306static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1307 struct smc_buf_desc *buf_desc)
1308{
1309 if (is_dmb) {
1310 /* restore original buf len */
1311 buf_desc->len += sizeof(struct smcd_cdc_msg);
1312 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1313 } else {
1314 kfree(buf_desc->cpu_addr);
1315 }
1316 kfree(buf_desc);
1317}
1318
1319static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1320 struct smc_buf_desc *buf_desc)
1321{
1322 if (lgr->is_smcd)
1323 smcd_buf_free(lgr, is_rmb, buf_desc);
1324 else
1325 smcr_buf_free(lgr, is_rmb, buf_desc);
1326}
1327
1328static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1329{
1330 struct smc_buf_desc *buf_desc, *bf_desc;
1331 struct list_head *buf_list;
1332 int i;
1333
1334 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1335 if (is_rmb)
1336 buf_list = &lgr->rmbs[i];
1337 else
1338 buf_list = &lgr->sndbufs[i];
1339 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1340 list) {
1341 list_del(&buf_desc->list);
1342 smc_buf_free(lgr, is_rmb, buf_desc);
1343 }
1344 }
1345}
1346
1347static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1348{
1349 /* free send buffers */
1350 __smc_lgr_free_bufs(lgr, false);
1351 /* free rmbs */
1352 __smc_lgr_free_bufs(lgr, true);
1353}
1354
1355/* won't be freed until no one accesses to lgr anymore */
1356static void __smc_lgr_free(struct smc_link_group *lgr)
1357{
1358 smc_lgr_free_bufs(lgr);
1359 if (lgr->is_smcd) {
1360 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1361 wake_up(&lgr->smcd->lgrs_deleted);
1362 } else {
1363 smc_wr_free_lgr_mem(lgr);
1364 if (!atomic_dec_return(&lgr_cnt))
1365 wake_up(&lgrs_deleted);
1366 }
1367 kfree(lgr);
1368}
1369
1370/* remove a link group */
1371static void smc_lgr_free(struct smc_link_group *lgr)
1372{
1373 int i;
1374
1375 if (!lgr->is_smcd) {
1376 mutex_lock(&lgr->llc_conf_mutex);
1377 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1378 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1379 smcr_link_clear(&lgr->lnk[i], false);
1380 }
1381 mutex_unlock(&lgr->llc_conf_mutex);
1382 smc_llc_lgr_clear(lgr);
1383 }
1384
1385 destroy_workqueue(lgr->tx_wq);
1386 if (lgr->is_smcd) {
1387 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1388 put_device(&lgr->smcd->dev);
1389 }
1390 smc_lgr_put(lgr); /* theoretically last lgr_put */
1391}
1392
1393void smc_lgr_hold(struct smc_link_group *lgr)
1394{
1395 refcount_inc(&lgr->refcnt);
1396}
1397
1398void smc_lgr_put(struct smc_link_group *lgr)
1399{
1400 if (refcount_dec_and_test(&lgr->refcnt))
1401 __smc_lgr_free(lgr);
1402}
1403
1404static void smc_sk_wake_ups(struct smc_sock *smc)
1405{
1406 smc->sk.sk_write_space(&smc->sk);
1407 smc->sk.sk_data_ready(&smc->sk);
1408 smc->sk.sk_state_change(&smc->sk);
1409}
1410
1411/* kill a connection */
1412static void smc_conn_kill(struct smc_connection *conn, bool soft)
1413{
1414 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1415
1416 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1417 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1418 else
1419 smc_close_abort(conn);
1420 conn->killed = 1;
1421 smc->sk.sk_err = ECONNABORTED;
1422 smc_sk_wake_ups(smc);
1423 if (conn->lgr->is_smcd) {
1424 smc_ism_unset_conn(conn);
1425 if (soft)
1426 tasklet_kill(&conn->rx_tsklet);
1427 else
1428 tasklet_unlock_wait(&conn->rx_tsklet);
1429 } else {
1430 smc_cdc_wait_pend_tx_wr(conn);
1431 }
1432 smc_lgr_unregister_conn(conn);
1433 smc_close_active_abort(smc);
1434}
1435
1436static void smc_lgr_cleanup(struct smc_link_group *lgr)
1437{
1438 if (lgr->is_smcd) {
1439 smc_ism_signal_shutdown(lgr);
1440 } else {
1441 u32 rsn = lgr->llc_termination_rsn;
1442
1443 if (!rsn)
1444 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1445 smc_llc_send_link_delete_all(lgr, false, rsn);
1446 smcr_lgr_link_deactivate_all(lgr);
1447 }
1448}
1449
1450/* terminate link group
1451 * @soft: true if link group shutdown can take its time
1452 * false if immediate link group shutdown is required
1453 */
1454static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1455{
1456 struct smc_connection *conn;
1457 struct smc_sock *smc;
1458 struct rb_node *node;
1459
1460 if (lgr->terminating)
1461 return; /* lgr already terminating */
1462 /* cancel free_work sync, will terminate when lgr->freeing is set */
1463 cancel_delayed_work_sync(&lgr->free_work);
1464 lgr->terminating = 1;
1465
1466 /* kill remaining link group connections */
1467 read_lock_bh(&lgr->conns_lock);
1468 node = rb_first(&lgr->conns_all);
1469 while (node) {
1470 read_unlock_bh(&lgr->conns_lock);
1471 conn = rb_entry(node, struct smc_connection, alert_node);
1472 smc = container_of(conn, struct smc_sock, conn);
1473 sock_hold(&smc->sk); /* sock_put below */
1474 lock_sock(&smc->sk);
1475 smc_conn_kill(conn, soft);
1476 release_sock(&smc->sk);
1477 sock_put(&smc->sk); /* sock_hold above */
1478 read_lock_bh(&lgr->conns_lock);
1479 node = rb_first(&lgr->conns_all);
1480 }
1481 read_unlock_bh(&lgr->conns_lock);
1482 smc_lgr_cleanup(lgr);
1483 smc_lgr_free(lgr);
1484}
1485
1486/* unlink link group and schedule termination */
1487void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1488{
1489 spinlock_t *lgr_lock;
1490
1491 smc_lgr_list_head(lgr, &lgr_lock);
1492 spin_lock_bh(lgr_lock);
1493 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1494 spin_unlock_bh(lgr_lock);
1495 return; /* lgr already terminating */
1496 }
1497 list_del_init(&lgr->list);
1498 lgr->freeing = 1;
1499 spin_unlock_bh(lgr_lock);
1500 schedule_work(&lgr->terminate_work);
1501}
1502
1503/* Called when peer lgr shutdown (regularly or abnormally) is received */
1504void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1505{
1506 struct smc_link_group *lgr, *l;
1507 LIST_HEAD(lgr_free_list);
1508
1509 /* run common cleanup function and build free list */
1510 spin_lock_bh(&dev->lgr_lock);
1511 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1512 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1513 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1514 if (peer_gid) /* peer triggered termination */
1515 lgr->peer_shutdown = 1;
1516 list_move(&lgr->list, &lgr_free_list);
1517 lgr->freeing = 1;
1518 }
1519 }
1520 spin_unlock_bh(&dev->lgr_lock);
1521
1522 /* cancel the regular free workers and actually free lgrs */
1523 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1524 list_del_init(&lgr->list);
1525 schedule_work(&lgr->terminate_work);
1526 }
1527}
1528
1529/* Called when an SMCD device is removed or the smc module is unloaded */
1530void smc_smcd_terminate_all(struct smcd_dev *smcd)
1531{
1532 struct smc_link_group *lgr, *lg;
1533 LIST_HEAD(lgr_free_list);
1534
1535 spin_lock_bh(&smcd->lgr_lock);
1536 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1537 list_for_each_entry(lgr, &lgr_free_list, list)
1538 lgr->freeing = 1;
1539 spin_unlock_bh(&smcd->lgr_lock);
1540
1541 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1542 list_del_init(&lgr->list);
1543 __smc_lgr_terminate(lgr, false);
1544 }
1545
1546 if (atomic_read(&smcd->lgr_cnt))
1547 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1548}
1549
1550/* Called when an SMCR device is removed or the smc module is unloaded.
1551 * If smcibdev is given, all SMCR link groups using this device are terminated.
1552 * If smcibdev is NULL, all SMCR link groups are terminated.
1553 */
1554void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1555{
1556 struct smc_link_group *lgr, *lg;
1557 LIST_HEAD(lgr_free_list);
1558 int i;
1559
1560 spin_lock_bh(&smc_lgr_list.lock);
1561 if (!smcibdev) {
1562 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1563 list_for_each_entry(lgr, &lgr_free_list, list)
1564 lgr->freeing = 1;
1565 } else {
1566 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1567 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1568 if (lgr->lnk[i].smcibdev == smcibdev)
1569 smcr_link_down_cond_sched(&lgr->lnk[i]);
1570 }
1571 }
1572 }
1573 spin_unlock_bh(&smc_lgr_list.lock);
1574
1575 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1576 list_del_init(&lgr->list);
1577 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1578 __smc_lgr_terminate(lgr, false);
1579 }
1580
1581 if (smcibdev) {
1582 if (atomic_read(&smcibdev->lnk_cnt))
1583 wait_event(smcibdev->lnks_deleted,
1584 !atomic_read(&smcibdev->lnk_cnt));
1585 } else {
1586 if (atomic_read(&lgr_cnt))
1587 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1588 }
1589}
1590
1591/* set new lgr type and clear all asymmetric link tagging */
1592void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1593{
1594 char *lgr_type = "";
1595 int i;
1596
1597 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1598 if (smc_link_usable(&lgr->lnk[i]))
1599 lgr->lnk[i].link_is_asym = false;
1600 if (lgr->type == new_type)
1601 return;
1602 lgr->type = new_type;
1603
1604 switch (lgr->type) {
1605 case SMC_LGR_NONE:
1606 lgr_type = "NONE";
1607 break;
1608 case SMC_LGR_SINGLE:
1609 lgr_type = "SINGLE";
1610 break;
1611 case SMC_LGR_SYMMETRIC:
1612 lgr_type = "SYMMETRIC";
1613 break;
1614 case SMC_LGR_ASYMMETRIC_PEER:
1615 lgr_type = "ASYMMETRIC_PEER";
1616 break;
1617 case SMC_LGR_ASYMMETRIC_LOCAL:
1618 lgr_type = "ASYMMETRIC_LOCAL";
1619 break;
1620 }
1621 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: "
1622 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1623 lgr->net->net_cookie, lgr_type, lgr->pnet_id);
1624}
1625
1626/* set new lgr type and tag a link as asymmetric */
1627void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1628 enum smc_lgr_type new_type, int asym_lnk_idx)
1629{
1630 smcr_lgr_set_type(lgr, new_type);
1631 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1632}
1633
1634/* abort connection, abort_work scheduled from tasklet context */
1635static void smc_conn_abort_work(struct work_struct *work)
1636{
1637 struct smc_connection *conn = container_of(work,
1638 struct smc_connection,
1639 abort_work);
1640 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1641
1642 lock_sock(&smc->sk);
1643 smc_conn_kill(conn, true);
1644 release_sock(&smc->sk);
1645 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1646}
1647
1648void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1649{
1650 struct smc_link_group *lgr, *n;
1651
1652 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1653 struct smc_link *link;
1654
1655 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1656 SMC_MAX_PNETID_LEN) ||
1657 lgr->type == SMC_LGR_SYMMETRIC ||
1658 lgr->type == SMC_LGR_ASYMMETRIC_PEER ||
1659 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net))
1660 continue;
1661
1662 /* trigger local add link processing */
1663 link = smc_llc_usable_link(lgr);
1664 if (link)
1665 smc_llc_add_link_local(link);
1666 }
1667}
1668
1669/* link is down - switch connections to alternate link,
1670 * must be called under lgr->llc_conf_mutex lock
1671 */
1672static void smcr_link_down(struct smc_link *lnk)
1673{
1674 struct smc_link_group *lgr = lnk->lgr;
1675 struct smc_link *to_lnk;
1676 int del_link_id;
1677
1678 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1679 return;
1680
1681 to_lnk = smc_switch_conns(lgr, lnk, true);
1682 if (!to_lnk) { /* no backup link available */
1683 smcr_link_clear(lnk, true);
1684 return;
1685 }
1686 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1687 del_link_id = lnk->link_id;
1688
1689 if (lgr->role == SMC_SERV) {
1690 /* trigger local delete link processing */
1691 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1692 } else {
1693 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1694 /* another llc task is ongoing */
1695 mutex_unlock(&lgr->llc_conf_mutex);
1696 wait_event_timeout(lgr->llc_flow_waiter,
1697 (list_empty(&lgr->list) ||
1698 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1699 SMC_LLC_WAIT_TIME);
1700 mutex_lock(&lgr->llc_conf_mutex);
1701 }
1702 if (!list_empty(&lgr->list)) {
1703 smc_llc_send_delete_link(to_lnk, del_link_id,
1704 SMC_LLC_REQ, true,
1705 SMC_LLC_DEL_LOST_PATH);
1706 smcr_link_clear(lnk, true);
1707 }
1708 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1709 }
1710}
1711
1712/* must be called under lgr->llc_conf_mutex lock */
1713void smcr_link_down_cond(struct smc_link *lnk)
1714{
1715 if (smc_link_downing(&lnk->state)) {
1716 trace_smcr_link_down(lnk, __builtin_return_address(0));
1717 smcr_link_down(lnk);
1718 }
1719}
1720
1721/* will get the lgr->llc_conf_mutex lock */
1722void smcr_link_down_cond_sched(struct smc_link *lnk)
1723{
1724 if (smc_link_downing(&lnk->state)) {
1725 trace_smcr_link_down(lnk, __builtin_return_address(0));
1726 schedule_work(&lnk->link_down_wrk);
1727 }
1728}
1729
1730void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1731{
1732 struct smc_link_group *lgr, *n;
1733 int i;
1734
1735 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1736 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1737 SMC_MAX_PNETID_LEN))
1738 continue; /* lgr is not affected */
1739 if (list_empty(&lgr->list))
1740 continue;
1741 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1742 struct smc_link *lnk = &lgr->lnk[i];
1743
1744 if (smc_link_usable(lnk) &&
1745 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1746 smcr_link_down_cond_sched(lnk);
1747 }
1748 }
1749}
1750
1751static void smc_link_down_work(struct work_struct *work)
1752{
1753 struct smc_link *link = container_of(work, struct smc_link,
1754 link_down_wrk);
1755 struct smc_link_group *lgr = link->lgr;
1756
1757 if (list_empty(&lgr->list))
1758 return;
1759 wake_up_all(&lgr->llc_msg_waiter);
1760 mutex_lock(&lgr->llc_conf_mutex);
1761 smcr_link_down(link);
1762 mutex_unlock(&lgr->llc_conf_mutex);
1763}
1764
1765static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
1766 struct netdev_nested_priv *priv)
1767{
1768 unsigned short *vlan_id = (unsigned short *)priv->data;
1769
1770 if (is_vlan_dev(lower_dev)) {
1771 *vlan_id = vlan_dev_vlan_id(lower_dev);
1772 return 1;
1773 }
1774
1775 return 0;
1776}
1777
1778/* Determine vlan of internal TCP socket. */
1779int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1780{
1781 struct dst_entry *dst = sk_dst_get(clcsock->sk);
1782 struct netdev_nested_priv priv;
1783 struct net_device *ndev;
1784 int rc = 0;
1785
1786 ini->vlan_id = 0;
1787 if (!dst) {
1788 rc = -ENOTCONN;
1789 goto out;
1790 }
1791 if (!dst->dev) {
1792 rc = -ENODEV;
1793 goto out_rel;
1794 }
1795
1796 ndev = dst->dev;
1797 if (is_vlan_dev(ndev)) {
1798 ini->vlan_id = vlan_dev_vlan_id(ndev);
1799 goto out_rel;
1800 }
1801
1802 priv.data = (void *)&ini->vlan_id;
1803 rtnl_lock();
1804 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
1805 rtnl_unlock();
1806
1807out_rel:
1808 dst_release(dst);
1809out:
1810 return rc;
1811}
1812
1813static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version,
1814 u8 peer_systemid[],
1815 u8 peer_gid[],
1816 u8 peer_mac_v1[],
1817 enum smc_lgr_role role, u32 clcqpn,
1818 struct net *net)
1819{
1820 struct smc_link *lnk;
1821 int i;
1822
1823 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) ||
1824 lgr->role != role)
1825 return false;
1826
1827 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1828 lnk = &lgr->lnk[i];
1829
1830 if (!smc_link_active(lnk))
1831 continue;
1832 /* use verbs API to check netns, instead of lgr->net */
1833 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net))
1834 return false;
1835 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) &&
1836 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) &&
1837 (smcr_version == SMC_V2 ||
1838 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN)))
1839 return true;
1840 }
1841 return false;
1842}
1843
1844static bool smcd_lgr_match(struct smc_link_group *lgr,
1845 struct smcd_dev *smcismdev, u64 peer_gid)
1846{
1847 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1848}
1849
1850/* create a new SMC connection (and a new link group if necessary) */
1851int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1852{
1853 struct smc_connection *conn = &smc->conn;
1854 struct net *net = sock_net(&smc->sk);
1855 struct list_head *lgr_list;
1856 struct smc_link_group *lgr;
1857 enum smc_lgr_role role;
1858 spinlock_t *lgr_lock;
1859 int rc = 0;
1860
1861 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1862 &smc_lgr_list.list;
1863 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1864 &smc_lgr_list.lock;
1865 ini->first_contact_local = 1;
1866 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1867 if (role == SMC_CLNT && ini->first_contact_peer)
1868 /* create new link group as well */
1869 goto create;
1870
1871 /* determine if an existing link group can be reused */
1872 spin_lock_bh(lgr_lock);
1873 list_for_each_entry(lgr, lgr_list, list) {
1874 write_lock_bh(&lgr->conns_lock);
1875 if ((ini->is_smcd ?
1876 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1877 ini->ism_peer_gid[ini->ism_selected]) :
1878 smcr_lgr_match(lgr, ini->smcr_version,
1879 ini->peer_systemid,
1880 ini->peer_gid, ini->peer_mac, role,
1881 ini->ib_clcqpn, net)) &&
1882 !lgr->sync_err &&
1883 (ini->smcd_version == SMC_V2 ||
1884 lgr->vlan_id == ini->vlan_id) &&
1885 (role == SMC_CLNT || ini->is_smcd ||
1886 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX &&
1887 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
1888 /* link group found */
1889 ini->first_contact_local = 0;
1890 conn->lgr = lgr;
1891 rc = smc_lgr_register_conn(conn, false);
1892 write_unlock_bh(&lgr->conns_lock);
1893 if (!rc && delayed_work_pending(&lgr->free_work))
1894 cancel_delayed_work(&lgr->free_work);
1895 break;
1896 }
1897 write_unlock_bh(&lgr->conns_lock);
1898 }
1899 spin_unlock_bh(lgr_lock);
1900 if (rc)
1901 return rc;
1902
1903 if (role == SMC_CLNT && !ini->first_contact_peer &&
1904 ini->first_contact_local) {
1905 /* Server reuses a link group, but Client wants to start
1906 * a new one
1907 * send out_of_sync decline, reason synchr. error
1908 */
1909 return SMC_CLC_DECL_SYNCERR;
1910 }
1911
1912create:
1913 if (ini->first_contact_local) {
1914 rc = smc_lgr_create(smc, ini);
1915 if (rc)
1916 goto out;
1917 lgr = conn->lgr;
1918 write_lock_bh(&lgr->conns_lock);
1919 rc = smc_lgr_register_conn(conn, true);
1920 write_unlock_bh(&lgr->conns_lock);
1921 if (rc) {
1922 smc_lgr_cleanup_early(lgr);
1923 goto out;
1924 }
1925 }
1926 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */
1927 if (!conn->lgr->is_smcd)
1928 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */
1929 conn->freed = 0;
1930 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1931 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1932 conn->urg_state = SMC_URG_READ;
1933 init_waitqueue_head(&conn->cdc_pend_tx_wq);
1934 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1935 if (ini->is_smcd) {
1936 conn->rx_off = sizeof(struct smcd_cdc_msg);
1937 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1938 } else {
1939 conn->rx_off = 0;
1940 }
1941#ifndef KERNEL_HAS_ATOMIC64
1942 spin_lock_init(&conn->acurs_lock);
1943#endif
1944
1945out:
1946 return rc;
1947}
1948
1949#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1950#define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */
1951
1952/* convert the RMB size into the compressed notation (minimum 16K, see
1953 * SMCD/R_DMBE_SIZES.
1954 * In contrast to plain ilog2, this rounds towards the next power of 2,
1955 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1956 */
1957static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
1958{
1959 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE;
1960 u8 compressed;
1961
1962 if (size <= SMC_BUF_MIN_SIZE)
1963 return 0;
1964
1965 size = (size - 1) >> 14; /* convert to 16K multiple */
1966 compressed = min_t(u8, ilog2(size) + 1,
1967 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
1968
1969 if (!is_smcd && is_rmb)
1970 /* RMBs are backed by & limited to max size of scatterlists */
1971 compressed = min_t(u8, compressed, ilog2(max_scat >> 14));
1972
1973 return compressed;
1974}
1975
1976/* convert the RMB size from compressed notation into integer */
1977int smc_uncompress_bufsize(u8 compressed)
1978{
1979 u32 size;
1980
1981 size = 0x00000001 << (((int)compressed) + 14);
1982 return (int)size;
1983}
1984
1985/* try to reuse a sndbuf or rmb description slot for a certain
1986 * buffer size; if not available, return NULL
1987 */
1988static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1989 struct mutex *lock,
1990 struct list_head *buf_list)
1991{
1992 struct smc_buf_desc *buf_slot;
1993
1994 mutex_lock(lock);
1995 list_for_each_entry(buf_slot, buf_list, list) {
1996 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1997 mutex_unlock(lock);
1998 return buf_slot;
1999 }
2000 }
2001 mutex_unlock(lock);
2002 return NULL;
2003}
2004
2005/* one of the conditions for announcing a receiver's current window size is
2006 * that it "results in a minimum increase in the window size of 10% of the
2007 * receive buffer space" [RFC7609]
2008 */
2009static inline int smc_rmb_wnd_update_limit(int rmbe_size)
2010{
2011 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
2012}
2013
2014/* map an buf to a link */
2015static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
2016 struct smc_link *lnk)
2017{
2018 int rc, i, nents, offset, buf_size, size, access_flags;
2019 struct scatterlist *sg;
2020 void *buf;
2021
2022 if (buf_desc->is_map_ib[lnk->link_idx])
2023 return 0;
2024
2025 if (buf_desc->is_vm) {
2026 buf = buf_desc->cpu_addr;
2027 buf_size = buf_desc->len;
2028 offset = offset_in_page(buf_desc->cpu_addr);
2029 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE;
2030 } else {
2031 nents = 1;
2032 }
2033
2034 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL);
2035 if (rc)
2036 return rc;
2037
2038 if (buf_desc->is_vm) {
2039 /* virtually contiguous buffer */
2040 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) {
2041 size = min_t(int, PAGE_SIZE - offset, buf_size);
2042 sg_set_page(sg, vmalloc_to_page(buf), size, offset);
2043 buf += size / sizeof(*buf);
2044 buf_size -= size;
2045 offset = 0;
2046 }
2047 } else {
2048 /* physically contiguous buffer */
2049 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
2050 buf_desc->cpu_addr, buf_desc->len);
2051 }
2052
2053 /* map sg table to DMA address */
2054 rc = smc_ib_buf_map_sg(lnk, buf_desc,
2055 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2056 /* SMC protocol depends on mapping to one DMA address only */
2057 if (rc != nents) {
2058 rc = -EAGAIN;
2059 goto free_table;
2060 }
2061
2062 buf_desc->is_dma_need_sync |=
2063 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx;
2064
2065 if (is_rmb || buf_desc->is_vm) {
2066 /* create a new memory region for the RMB or vzalloced sndbuf */
2067 access_flags = is_rmb ?
2068 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
2069 IB_ACCESS_LOCAL_WRITE;
2070
2071 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags,
2072 buf_desc, lnk->link_idx);
2073 if (rc)
2074 goto buf_unmap;
2075 smc_ib_sync_sg_for_device(lnk, buf_desc,
2076 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2077 }
2078 buf_desc->is_map_ib[lnk->link_idx] = true;
2079 return 0;
2080
2081buf_unmap:
2082 smc_ib_buf_unmap_sg(lnk, buf_desc,
2083 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2084free_table:
2085 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
2086 return rc;
2087}
2088
2089/* register a new buf on IB device, rmb or vzalloced sndbuf
2090 * must be called under lgr->llc_conf_mutex lock
2091 */
2092int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc)
2093{
2094 if (list_empty(&link->lgr->list))
2095 return -ENOLINK;
2096 if (!buf_desc->is_reg_mr[link->link_idx]) {
2097 /* register memory region for new buf */
2098 if (buf_desc->is_vm)
2099 buf_desc->mr[link->link_idx]->iova =
2100 (uintptr_t)buf_desc->cpu_addr;
2101 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) {
2102 buf_desc->is_reg_err = true;
2103 return -EFAULT;
2104 }
2105 buf_desc->is_reg_mr[link->link_idx] = true;
2106 }
2107 return 0;
2108}
2109
2110static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
2111 struct list_head *lst, bool is_rmb)
2112{
2113 struct smc_buf_desc *buf_desc, *bf;
2114 int rc = 0;
2115
2116 mutex_lock(lock);
2117 list_for_each_entry_safe(buf_desc, bf, lst, list) {
2118 if (!buf_desc->used)
2119 continue;
2120 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
2121 if (rc)
2122 goto out;
2123 }
2124out:
2125 mutex_unlock(lock);
2126 return rc;
2127}
2128
2129/* map all used buffers of lgr for a new link */
2130int smcr_buf_map_lgr(struct smc_link *lnk)
2131{
2132 struct smc_link_group *lgr = lnk->lgr;
2133 int i, rc = 0;
2134
2135 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2136 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
2137 &lgr->rmbs[i], true);
2138 if (rc)
2139 return rc;
2140 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
2141 &lgr->sndbufs[i], false);
2142 if (rc)
2143 return rc;
2144 }
2145 return 0;
2146}
2147
2148/* register all used buffers of lgr for a new link,
2149 * must be called under lgr->llc_conf_mutex lock
2150 */
2151int smcr_buf_reg_lgr(struct smc_link *lnk)
2152{
2153 struct smc_link_group *lgr = lnk->lgr;
2154 struct smc_buf_desc *buf_desc, *bf;
2155 int i, rc = 0;
2156
2157 /* reg all RMBs for a new link */
2158 mutex_lock(&lgr->rmbs_lock);
2159 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2160 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
2161 if (!buf_desc->used)
2162 continue;
2163 rc = smcr_link_reg_buf(lnk, buf_desc);
2164 if (rc) {
2165 mutex_unlock(&lgr->rmbs_lock);
2166 return rc;
2167 }
2168 }
2169 }
2170 mutex_unlock(&lgr->rmbs_lock);
2171
2172 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS)
2173 return rc;
2174
2175 /* reg all vzalloced sndbufs for a new link */
2176 mutex_lock(&lgr->sndbufs_lock);
2177 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2178 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) {
2179 if (!buf_desc->used || !buf_desc->is_vm)
2180 continue;
2181 rc = smcr_link_reg_buf(lnk, buf_desc);
2182 if (rc) {
2183 mutex_unlock(&lgr->sndbufs_lock);
2184 return rc;
2185 }
2186 }
2187 }
2188 mutex_unlock(&lgr->sndbufs_lock);
2189 return rc;
2190}
2191
2192static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
2193 bool is_rmb, int bufsize)
2194{
2195 struct smc_buf_desc *buf_desc;
2196
2197 /* try to alloc a new buffer */
2198 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2199 if (!buf_desc)
2200 return ERR_PTR(-ENOMEM);
2201
2202 switch (lgr->buf_type) {
2203 case SMCR_PHYS_CONT_BUFS:
2204 case SMCR_MIXED_BUFS:
2205 buf_desc->order = get_order(bufsize);
2206 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
2207 __GFP_NOMEMALLOC | __GFP_COMP |
2208 __GFP_NORETRY | __GFP_ZERO,
2209 buf_desc->order);
2210 if (buf_desc->pages) {
2211 buf_desc->cpu_addr =
2212 (void *)page_address(buf_desc->pages);
2213 buf_desc->len = bufsize;
2214 buf_desc->is_vm = false;
2215 break;
2216 }
2217 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS)
2218 goto out;
2219 fallthrough; // try virtually continguous buf
2220 case SMCR_VIRT_CONT_BUFS:
2221 buf_desc->order = get_order(bufsize);
2222 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order);
2223 if (!buf_desc->cpu_addr)
2224 goto out;
2225 buf_desc->pages = NULL;
2226 buf_desc->len = bufsize;
2227 buf_desc->is_vm = true;
2228 break;
2229 }
2230 return buf_desc;
2231
2232out:
2233 kfree(buf_desc);
2234 return ERR_PTR(-EAGAIN);
2235}
2236
2237/* map buf_desc on all usable links,
2238 * unused buffers stay mapped as long as the link is up
2239 */
2240static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
2241 struct smc_buf_desc *buf_desc, bool is_rmb)
2242{
2243 int i, rc = 0, cnt = 0;
2244
2245 /* protect against parallel link reconfiguration */
2246 mutex_lock(&lgr->llc_conf_mutex);
2247 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2248 struct smc_link *lnk = &lgr->lnk[i];
2249
2250 if (!smc_link_usable(lnk))
2251 continue;
2252 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
2253 rc = -ENOMEM;
2254 goto out;
2255 }
2256 cnt++;
2257 }
2258out:
2259 mutex_unlock(&lgr->llc_conf_mutex);
2260 if (!rc && !cnt)
2261 rc = -EINVAL;
2262 return rc;
2263}
2264
2265static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2266 bool is_dmb, int bufsize)
2267{
2268 struct smc_buf_desc *buf_desc;
2269 int rc;
2270
2271 /* try to alloc a new DMB */
2272 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2273 if (!buf_desc)
2274 return ERR_PTR(-ENOMEM);
2275 if (is_dmb) {
2276 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2277 if (rc) {
2278 kfree(buf_desc);
2279 if (rc == -ENOMEM)
2280 return ERR_PTR(-EAGAIN);
2281 if (rc == -ENOSPC)
2282 return ERR_PTR(-ENOSPC);
2283 return ERR_PTR(-EIO);
2284 }
2285 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2286 /* CDC header stored in buf. So, pretend it was smaller */
2287 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2288 } else {
2289 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2290 __GFP_NOWARN | __GFP_NORETRY |
2291 __GFP_NOMEMALLOC);
2292 if (!buf_desc->cpu_addr) {
2293 kfree(buf_desc);
2294 return ERR_PTR(-EAGAIN);
2295 }
2296 buf_desc->len = bufsize;
2297 }
2298 return buf_desc;
2299}
2300
2301static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2302{
2303 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2304 struct smc_connection *conn = &smc->conn;
2305 struct smc_link_group *lgr = conn->lgr;
2306 struct list_head *buf_list;
2307 int bufsize, bufsize_short;
2308 bool is_dgraded = false;
2309 struct mutex *lock; /* lock buffer list */
2310 int sk_buf_size;
2311
2312 if (is_rmb)
2313 /* use socket recv buffer size (w/o overhead) as start value */
2314 sk_buf_size = smc->sk.sk_rcvbuf;
2315 else
2316 /* use socket send buffer size (w/o overhead) as start value */
2317 sk_buf_size = smc->sk.sk_sndbuf;
2318
2319 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb);
2320 bufsize_short >= 0; bufsize_short--) {
2321 if (is_rmb) {
2322 lock = &lgr->rmbs_lock;
2323 buf_list = &lgr->rmbs[bufsize_short];
2324 } else {
2325 lock = &lgr->sndbufs_lock;
2326 buf_list = &lgr->sndbufs[bufsize_short];
2327 }
2328 bufsize = smc_uncompress_bufsize(bufsize_short);
2329
2330 /* check for reusable slot in the link group */
2331 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2332 if (buf_desc) {
2333 buf_desc->is_dma_need_sync = 0;
2334 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2335 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
2336 break; /* found reusable slot */
2337 }
2338
2339 if (is_smcd)
2340 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2341 else
2342 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2343
2344 if (PTR_ERR(buf_desc) == -ENOMEM)
2345 break;
2346 if (IS_ERR(buf_desc)) {
2347 if (!is_dgraded) {
2348 is_dgraded = true;
2349 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
2350 }
2351 continue;
2352 }
2353
2354 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
2355 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2356 buf_desc->used = 1;
2357 mutex_lock(lock);
2358 list_add(&buf_desc->list, buf_list);
2359 mutex_unlock(lock);
2360 break; /* found */
2361 }
2362
2363 if (IS_ERR(buf_desc))
2364 return PTR_ERR(buf_desc);
2365
2366 if (!is_smcd) {
2367 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2368 smcr_buf_unuse(buf_desc, is_rmb, lgr);
2369 return -ENOMEM;
2370 }
2371 }
2372
2373 if (is_rmb) {
2374 conn->rmb_desc = buf_desc;
2375 conn->rmbe_size_short = bufsize_short;
2376 smc->sk.sk_rcvbuf = bufsize;
2377 atomic_set(&conn->bytes_to_rcv, 0);
2378 conn->rmbe_update_limit =
2379 smc_rmb_wnd_update_limit(buf_desc->len);
2380 if (is_smcd)
2381 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2382 } else {
2383 conn->sndbuf_desc = buf_desc;
2384 smc->sk.sk_sndbuf = bufsize;
2385 atomic_set(&conn->sndbuf_space, bufsize);
2386 }
2387 return 0;
2388}
2389
2390void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2391{
2392 if (!conn->sndbuf_desc->is_dma_need_sync)
2393 return;
2394 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd ||
2395 !smc_link_active(conn->lnk))
2396 return;
2397 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2398}
2399
2400void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2401{
2402 int i;
2403
2404 if (!conn->rmb_desc->is_dma_need_sync)
2405 return;
2406 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd)
2407 return;
2408 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2409 if (!smc_link_active(&conn->lgr->lnk[i]))
2410 continue;
2411 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2412 DMA_FROM_DEVICE);
2413 }
2414}
2415
2416/* create the send and receive buffer for an SMC socket;
2417 * receive buffers are called RMBs;
2418 * (even though the SMC protocol allows more than one RMB-element per RMB,
2419 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2420 * extra RMB for every connection in a link group
2421 */
2422int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2423{
2424 int rc;
2425
2426 /* create send buffer */
2427 rc = __smc_buf_create(smc, is_smcd, false);
2428 if (rc)
2429 return rc;
2430 /* create rmb */
2431 rc = __smc_buf_create(smc, is_smcd, true);
2432 if (rc) {
2433 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2434 list_del(&smc->conn.sndbuf_desc->list);
2435 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2436 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2437 smc->conn.sndbuf_desc = NULL;
2438 }
2439 return rc;
2440}
2441
2442static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2443{
2444 int i;
2445
2446 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2447 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2448 return i;
2449 }
2450 return -ENOSPC;
2451}
2452
2453static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2454 u32 rkey)
2455{
2456 int i;
2457
2458 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2459 if (test_bit(i, lgr->rtokens_used_mask) &&
2460 lgr->rtokens[i][lnk_idx].rkey == rkey)
2461 return i;
2462 }
2463 return -ENOENT;
2464}
2465
2466/* set rtoken for a new link to an existing rmb */
2467void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2468 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2469{
2470 int rtok_idx;
2471
2472 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2473 if (rtok_idx == -ENOENT)
2474 return;
2475 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2476 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2477}
2478
2479/* set rtoken for a new link whose link_id is given */
2480void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2481 __be64 nw_vaddr, __be32 nw_rkey)
2482{
2483 u64 dma_addr = be64_to_cpu(nw_vaddr);
2484 u32 rkey = ntohl(nw_rkey);
2485 bool found = false;
2486 int link_idx;
2487
2488 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2489 if (lgr->lnk[link_idx].link_id == link_id) {
2490 found = true;
2491 break;
2492 }
2493 }
2494 if (!found)
2495 return;
2496 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2497 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2498}
2499
2500/* add a new rtoken from peer */
2501int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2502{
2503 struct smc_link_group *lgr = smc_get_lgr(lnk);
2504 u64 dma_addr = be64_to_cpu(nw_vaddr);
2505 u32 rkey = ntohl(nw_rkey);
2506 int i;
2507
2508 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2509 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2510 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2511 test_bit(i, lgr->rtokens_used_mask)) {
2512 /* already in list */
2513 return i;
2514 }
2515 }
2516 i = smc_rmb_reserve_rtoken_idx(lgr);
2517 if (i < 0)
2518 return i;
2519 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2520 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2521 return i;
2522}
2523
2524/* delete an rtoken from all links */
2525int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2526{
2527 struct smc_link_group *lgr = smc_get_lgr(lnk);
2528 u32 rkey = ntohl(nw_rkey);
2529 int i, j;
2530
2531 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2532 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2533 test_bit(i, lgr->rtokens_used_mask)) {
2534 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2535 lgr->rtokens[i][j].rkey = 0;
2536 lgr->rtokens[i][j].dma_addr = 0;
2537 }
2538 clear_bit(i, lgr->rtokens_used_mask);
2539 return 0;
2540 }
2541 }
2542 return -ENOENT;
2543}
2544
2545/* save rkey and dma_addr received from peer during clc handshake */
2546int smc_rmb_rtoken_handling(struct smc_connection *conn,
2547 struct smc_link *lnk,
2548 struct smc_clc_msg_accept_confirm *clc)
2549{
2550 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2551 clc->r0.rmb_rkey);
2552 if (conn->rtoken_idx < 0)
2553 return conn->rtoken_idx;
2554 return 0;
2555}
2556
2557static void smc_core_going_away(void)
2558{
2559 struct smc_ib_device *smcibdev;
2560 struct smcd_dev *smcd;
2561
2562 mutex_lock(&smc_ib_devices.mutex);
2563 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2564 int i;
2565
2566 for (i = 0; i < SMC_MAX_PORTS; i++)
2567 set_bit(i, smcibdev->ports_going_away);
2568 }
2569 mutex_unlock(&smc_ib_devices.mutex);
2570
2571 mutex_lock(&smcd_dev_list.mutex);
2572 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2573 smcd->going_away = 1;
2574 }
2575 mutex_unlock(&smcd_dev_list.mutex);
2576}
2577
2578/* Clean up all SMC link groups */
2579static void smc_lgrs_shutdown(void)
2580{
2581 struct smcd_dev *smcd;
2582
2583 smc_core_going_away();
2584
2585 smc_smcr_terminate_all(NULL);
2586
2587 mutex_lock(&smcd_dev_list.mutex);
2588 list_for_each_entry(smcd, &smcd_dev_list.list, list)
2589 smc_smcd_terminate_all(smcd);
2590 mutex_unlock(&smcd_dev_list.mutex);
2591}
2592
2593static int smc_core_reboot_event(struct notifier_block *this,
2594 unsigned long event, void *ptr)
2595{
2596 smc_lgrs_shutdown();
2597 smc_ib_unregister_client();
2598 return 0;
2599}
2600
2601static struct notifier_block smc_reboot_notifier = {
2602 .notifier_call = smc_core_reboot_event,
2603};
2604
2605int __init smc_core_init(void)
2606{
2607 return register_reboot_notifier(&smc_reboot_notifier);
2608}
2609
2610/* Called (from smc_exit) when module is removed */
2611void smc_core_exit(void)
2612{
2613 unregister_reboot_notifier(&smc_reboot_notifier);
2614 smc_lgrs_shutdown();
2615}