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Merge tag 'arm-soc/for-5.20/defconfig-arm64' of https://github.com/Broadcom/stblinux...
[people/ms/linux.git] / net / smc / smc_core.c
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
43 struct 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
49 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
50 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
51
52 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
53 struct smc_buf_desc *buf_desc);
54 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
55
56 static 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 */
59 static 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
71 static void smc_ibdev_cnt_inc(struct smc_link *lnk)
72 {
73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
74 }
75
76 static void smc_ibdev_cnt_dec(struct smc_link *lnk)
77 {
78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
79 }
80
81 static 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 */
101 static 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 */
123 static 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 */
166 static 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 */
195 static 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 */
210 static 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
223 int 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
270 errattr:
271 nla_nest_cancel(skb, attrs);
272 errout:
273 genlmsg_cancel(skb, nlh);
274 errmsg:
275 return skb->len;
276 }
277
278 /* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */
279 static 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
305 errv2attr:
306 nla_nest_cancel(skb, v2_attrs);
307 return -EMSGSIZE;
308 }
309
310 static 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
325 errv2attr:
326 nla_nest_cancel(skb, v2_attrs);
327 errattr:
328 return -EMSGSIZE;
329 }
330
331 static 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_VLAN_ID, lgr->vlan_id))
351 goto errattr;
352 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE,
353 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD))
354 goto errattr;
355 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
356 smc_target[SMC_MAX_PNETID_LEN] = 0;
357 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
358 goto errattr;
359 if (lgr->smc_version > SMC_V1) {
360 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON);
361 if (!v2_attrs)
362 goto errattr;
363 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
364 goto errattr;
365 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb))
366 goto errattr;
367 }
368
369 nla_nest_end(skb, attrs);
370 return 0;
371 errattr:
372 nla_nest_cancel(skb, attrs);
373 errout:
374 return -EMSGSIZE;
375 }
376
377 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
378 struct smc_link *link,
379 struct sk_buff *skb,
380 struct netlink_callback *cb)
381 {
382 char smc_ibname[IB_DEVICE_NAME_MAX];
383 u8 smc_gid_target[41];
384 struct nlattr *attrs;
385 u32 link_uid = 0;
386 void *nlh;
387
388 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
389 &smc_gen_nl_family, NLM_F_MULTI,
390 SMC_NETLINK_GET_LINK_SMCR);
391 if (!nlh)
392 goto errmsg;
393
394 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
395 if (!attrs)
396 goto errout;
397
398 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
399 goto errattr;
400 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
401 goto errattr;
402 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
403 atomic_read(&link->conn_cnt)))
404 goto errattr;
405 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
406 goto errattr;
407 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
408 goto errattr;
409 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
410 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
411 goto errattr;
412 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
413 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
414 goto errattr;
415 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
416 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
417 goto errattr;
418 memset(smc_gid_target, 0, sizeof(smc_gid_target));
419 smc_gid_be16_convert(smc_gid_target, link->gid);
420 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
421 goto errattr;
422 memset(smc_gid_target, 0, sizeof(smc_gid_target));
423 smc_gid_be16_convert(smc_gid_target, link->peer_gid);
424 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
425 goto errattr;
426
427 nla_nest_end(skb, attrs);
428 genlmsg_end(skb, nlh);
429 return 0;
430 errattr:
431 nla_nest_cancel(skb, attrs);
432 errout:
433 genlmsg_cancel(skb, nlh);
434 errmsg:
435 return -EMSGSIZE;
436 }
437
438 static int smc_nl_handle_lgr(struct smc_link_group *lgr,
439 struct sk_buff *skb,
440 struct netlink_callback *cb,
441 bool list_links)
442 {
443 void *nlh;
444 int i;
445
446 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
447 &smc_gen_nl_family, NLM_F_MULTI,
448 SMC_NETLINK_GET_LGR_SMCR);
449 if (!nlh)
450 goto errmsg;
451 if (smc_nl_fill_lgr(lgr, skb, cb))
452 goto errout;
453
454 genlmsg_end(skb, nlh);
455 if (!list_links)
456 goto out;
457 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
458 if (!smc_link_usable(&lgr->lnk[i]))
459 continue;
460 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
461 goto errout;
462 }
463 out:
464 return 0;
465
466 errout:
467 genlmsg_cancel(skb, nlh);
468 errmsg:
469 return -EMSGSIZE;
470 }
471
472 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
473 struct sk_buff *skb,
474 struct netlink_callback *cb,
475 bool list_links)
476 {
477 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
478 struct smc_link_group *lgr;
479 int snum = cb_ctx->pos[0];
480 int num = 0;
481
482 spin_lock_bh(&smc_lgr->lock);
483 list_for_each_entry(lgr, &smc_lgr->list, list) {
484 if (num < snum)
485 goto next;
486 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
487 goto errout;
488 next:
489 num++;
490 }
491 errout:
492 spin_unlock_bh(&smc_lgr->lock);
493 cb_ctx->pos[0] = num;
494 }
495
496 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
497 struct sk_buff *skb,
498 struct netlink_callback *cb)
499 {
500 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
501 struct nlattr *attrs;
502 void *nlh;
503
504 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
505 &smc_gen_nl_family, NLM_F_MULTI,
506 SMC_NETLINK_GET_LGR_SMCD);
507 if (!nlh)
508 goto errmsg;
509
510 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
511 if (!attrs)
512 goto errout;
513
514 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
515 goto errattr;
516 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
517 SMC_NLA_LGR_D_PAD))
518 goto errattr;
519 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
520 SMC_NLA_LGR_D_PAD))
521 goto errattr;
522 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
523 goto errattr;
524 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
525 goto errattr;
526 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
527 goto errattr;
528 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
529 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
530 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
531 goto errattr;
532 if (lgr->smc_version > SMC_V1) {
533 struct nlattr *v2_attrs;
534
535 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON);
536 if (!v2_attrs)
537 goto errattr;
538 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
539 goto errattr;
540 }
541 nla_nest_end(skb, attrs);
542 genlmsg_end(skb, nlh);
543 return 0;
544
545 errattr:
546 nla_nest_cancel(skb, attrs);
547 errout:
548 genlmsg_cancel(skb, nlh);
549 errmsg:
550 return -EMSGSIZE;
551 }
552
553 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
554 struct sk_buff *skb,
555 struct netlink_callback *cb)
556 {
557 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
558 struct smc_link_group *lgr;
559 int snum = cb_ctx->pos[1];
560 int rc = 0, num = 0;
561
562 spin_lock_bh(&dev->lgr_lock);
563 list_for_each_entry(lgr, &dev->lgr_list, list) {
564 if (!lgr->is_smcd)
565 continue;
566 if (num < snum)
567 goto next;
568 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
569 if (rc)
570 goto errout;
571 next:
572 num++;
573 }
574 errout:
575 spin_unlock_bh(&dev->lgr_lock);
576 cb_ctx->pos[1] = num;
577 return rc;
578 }
579
580 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
581 struct sk_buff *skb,
582 struct netlink_callback *cb)
583 {
584 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
585 struct smcd_dev *smcd_dev;
586 int snum = cb_ctx->pos[0];
587 int rc = 0, num = 0;
588
589 mutex_lock(&dev_list->mutex);
590 list_for_each_entry(smcd_dev, &dev_list->list, list) {
591 if (list_empty(&smcd_dev->lgr_list))
592 continue;
593 if (num < snum)
594 goto next;
595 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
596 if (rc)
597 goto errout;
598 next:
599 num++;
600 }
601 errout:
602 mutex_unlock(&dev_list->mutex);
603 cb_ctx->pos[0] = num;
604 return rc;
605 }
606
607 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
608 {
609 bool list_links = false;
610
611 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
612 return skb->len;
613 }
614
615 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
616 {
617 bool list_links = true;
618
619 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
620 return skb->len;
621 }
622
623 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
624 {
625 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
626 return skb->len;
627 }
628
629 void smc_lgr_cleanup_early(struct smc_link_group *lgr)
630 {
631 spinlock_t *lgr_lock;
632
633 if (!lgr)
634 return;
635
636 smc_lgr_list_head(lgr, &lgr_lock);
637 spin_lock_bh(lgr_lock);
638 /* do not use this link group for new connections */
639 if (!list_empty(&lgr->list))
640 list_del_init(&lgr->list);
641 spin_unlock_bh(lgr_lock);
642 __smc_lgr_terminate(lgr, true);
643 }
644
645 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
646 {
647 int i;
648
649 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
650 struct smc_link *lnk = &lgr->lnk[i];
651
652 if (smc_link_sendable(lnk))
653 lnk->state = SMC_LNK_INACTIVE;
654 }
655 wake_up_all(&lgr->llc_msg_waiter);
656 wake_up_all(&lgr->llc_flow_waiter);
657 }
658
659 static void smc_lgr_free(struct smc_link_group *lgr);
660
661 static void smc_lgr_free_work(struct work_struct *work)
662 {
663 struct smc_link_group *lgr = container_of(to_delayed_work(work),
664 struct smc_link_group,
665 free_work);
666 spinlock_t *lgr_lock;
667 bool conns;
668
669 smc_lgr_list_head(lgr, &lgr_lock);
670 spin_lock_bh(lgr_lock);
671 if (lgr->freeing) {
672 spin_unlock_bh(lgr_lock);
673 return;
674 }
675 read_lock_bh(&lgr->conns_lock);
676 conns = RB_EMPTY_ROOT(&lgr->conns_all);
677 read_unlock_bh(&lgr->conns_lock);
678 if (!conns) { /* number of lgr connections is no longer zero */
679 spin_unlock_bh(lgr_lock);
680 return;
681 }
682 list_del_init(&lgr->list); /* remove from smc_lgr_list */
683 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
684 spin_unlock_bh(lgr_lock);
685 cancel_delayed_work(&lgr->free_work);
686
687 if (!lgr->is_smcd && !lgr->terminating)
688 smc_llc_send_link_delete_all(lgr, true,
689 SMC_LLC_DEL_PROG_INIT_TERM);
690 if (lgr->is_smcd && !lgr->terminating)
691 smc_ism_signal_shutdown(lgr);
692 if (!lgr->is_smcd)
693 smcr_lgr_link_deactivate_all(lgr);
694 smc_lgr_free(lgr);
695 }
696
697 static void smc_lgr_terminate_work(struct work_struct *work)
698 {
699 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
700 terminate_work);
701
702 __smc_lgr_terminate(lgr, true);
703 }
704
705 /* return next unique link id for the lgr */
706 static u8 smcr_next_link_id(struct smc_link_group *lgr)
707 {
708 u8 link_id;
709 int i;
710
711 while (1) {
712 again:
713 link_id = ++lgr->next_link_id;
714 if (!link_id) /* skip zero as link_id */
715 link_id = ++lgr->next_link_id;
716 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
717 if (smc_link_usable(&lgr->lnk[i]) &&
718 lgr->lnk[i].link_id == link_id)
719 goto again;
720 }
721 break;
722 }
723 return link_id;
724 }
725
726 static void smcr_copy_dev_info_to_link(struct smc_link *link)
727 {
728 struct smc_ib_device *smcibdev = link->smcibdev;
729
730 snprintf(link->ibname, sizeof(link->ibname), "%s",
731 smcibdev->ibdev->name);
732 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
733 }
734
735 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
736 u8 link_idx, struct smc_init_info *ini)
737 {
738 struct smc_ib_device *smcibdev;
739 u8 rndvec[3];
740 int rc;
741
742 if (lgr->smc_version == SMC_V2) {
743 lnk->smcibdev = ini->smcrv2.ib_dev_v2;
744 lnk->ibport = ini->smcrv2.ib_port_v2;
745 } else {
746 lnk->smcibdev = ini->ib_dev;
747 lnk->ibport = ini->ib_port;
748 }
749 get_device(&lnk->smcibdev->ibdev->dev);
750 atomic_inc(&lnk->smcibdev->lnk_cnt);
751 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */
752 lnk->clearing = 0;
753 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu;
754 lnk->link_id = smcr_next_link_id(lgr);
755 lnk->lgr = lgr;
756 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */
757 lnk->link_idx = link_idx;
758 smc_ibdev_cnt_inc(lnk);
759 smcr_copy_dev_info_to_link(lnk);
760 atomic_set(&lnk->conn_cnt, 0);
761 smc_llc_link_set_uid(lnk);
762 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
763 if (!lnk->smcibdev->initialized) {
764 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev);
765 if (rc)
766 goto out;
767 }
768 get_random_bytes(rndvec, sizeof(rndvec));
769 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
770 (rndvec[2] << 16);
771 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
772 ini->vlan_id, lnk->gid, &lnk->sgid_index,
773 lgr->smc_version == SMC_V2 ?
774 &ini->smcrv2 : NULL);
775 if (rc)
776 goto out;
777 rc = smc_llc_link_init(lnk);
778 if (rc)
779 goto out;
780 rc = smc_wr_alloc_link_mem(lnk);
781 if (rc)
782 goto clear_llc_lnk;
783 rc = smc_ib_create_protection_domain(lnk);
784 if (rc)
785 goto free_link_mem;
786 rc = smc_ib_create_queue_pair(lnk);
787 if (rc)
788 goto dealloc_pd;
789 rc = smc_wr_create_link(lnk);
790 if (rc)
791 goto destroy_qp;
792 lnk->state = SMC_LNK_ACTIVATING;
793 return 0;
794
795 destroy_qp:
796 smc_ib_destroy_queue_pair(lnk);
797 dealloc_pd:
798 smc_ib_dealloc_protection_domain(lnk);
799 free_link_mem:
800 smc_wr_free_link_mem(lnk);
801 clear_llc_lnk:
802 smc_llc_link_clear(lnk, false);
803 out:
804 smc_ibdev_cnt_dec(lnk);
805 put_device(&lnk->smcibdev->ibdev->dev);
806 smcibdev = lnk->smcibdev;
807 memset(lnk, 0, sizeof(struct smc_link));
808 lnk->state = SMC_LNK_UNUSED;
809 if (!atomic_dec_return(&smcibdev->lnk_cnt))
810 wake_up(&smcibdev->lnks_deleted);
811 smc_lgr_put(lgr); /* lgr_hold above */
812 return rc;
813 }
814
815 /* create a new SMC link group */
816 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
817 {
818 struct smc_link_group *lgr;
819 struct list_head *lgr_list;
820 struct smc_link *lnk;
821 spinlock_t *lgr_lock;
822 u8 link_idx;
823 int rc = 0;
824 int i;
825
826 if (ini->is_smcd && ini->vlan_id) {
827 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
828 ini->vlan_id)) {
829 rc = SMC_CLC_DECL_ISMVLANERR;
830 goto out;
831 }
832 }
833
834 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
835 if (!lgr) {
836 rc = SMC_CLC_DECL_MEM;
837 goto ism_put_vlan;
838 }
839 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
840 SMC_LGR_ID_SIZE, &lgr->id);
841 if (!lgr->tx_wq) {
842 rc = -ENOMEM;
843 goto free_lgr;
844 }
845 lgr->is_smcd = ini->is_smcd;
846 lgr->sync_err = 0;
847 lgr->terminating = 0;
848 lgr->freeing = 0;
849 lgr->vlan_id = ini->vlan_id;
850 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */
851 mutex_init(&lgr->sndbufs_lock);
852 mutex_init(&lgr->rmbs_lock);
853 rwlock_init(&lgr->conns_lock);
854 for (i = 0; i < SMC_RMBE_SIZES; i++) {
855 INIT_LIST_HEAD(&lgr->sndbufs[i]);
856 INIT_LIST_HEAD(&lgr->rmbs[i]);
857 }
858 lgr->next_link_id = 0;
859 smc_lgr_list.num += SMC_LGR_NUM_INCR;
860 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
861 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
862 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
863 lgr->conns_all = RB_ROOT;
864 if (ini->is_smcd) {
865 /* SMC-D specific settings */
866 get_device(&ini->ism_dev[ini->ism_selected]->dev);
867 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
868 lgr->smcd = ini->ism_dev[ini->ism_selected];
869 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
870 lgr_lock = &lgr->smcd->lgr_lock;
871 lgr->smc_version = ini->smcd_version;
872 lgr->peer_shutdown = 0;
873 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
874 } else {
875 /* SMC-R specific settings */
876 struct smc_ib_device *ibdev;
877 int ibport;
878
879 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
880 lgr->smc_version = ini->smcr_version;
881 memcpy(lgr->peer_systemid, ini->peer_systemid,
882 SMC_SYSTEMID_LEN);
883 if (lgr->smc_version == SMC_V2) {
884 ibdev = ini->smcrv2.ib_dev_v2;
885 ibport = ini->smcrv2.ib_port_v2;
886 lgr->saddr = ini->smcrv2.saddr;
887 lgr->uses_gateway = ini->smcrv2.uses_gateway;
888 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac,
889 ETH_ALEN);
890 } else {
891 ibdev = ini->ib_dev;
892 ibport = ini->ib_port;
893 }
894 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1],
895 SMC_MAX_PNETID_LEN);
896 if (smc_wr_alloc_lgr_mem(lgr))
897 goto free_wq;
898 smc_llc_lgr_init(lgr, smc);
899
900 link_idx = SMC_SINGLE_LINK;
901 lnk = &lgr->lnk[link_idx];
902 rc = smcr_link_init(lgr, lnk, link_idx, ini);
903 if (rc) {
904 smc_wr_free_lgr_mem(lgr);
905 goto free_wq;
906 }
907 lgr->net = smc_ib_net(lnk->smcibdev);
908 lgr_list = &smc_lgr_list.list;
909 lgr_lock = &smc_lgr_list.lock;
910 atomic_inc(&lgr_cnt);
911 }
912 smc->conn.lgr = lgr;
913 spin_lock_bh(lgr_lock);
914 list_add_tail(&lgr->list, lgr_list);
915 spin_unlock_bh(lgr_lock);
916 return 0;
917
918 free_wq:
919 destroy_workqueue(lgr->tx_wq);
920 free_lgr:
921 kfree(lgr);
922 ism_put_vlan:
923 if (ini->is_smcd && ini->vlan_id)
924 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
925 out:
926 if (rc < 0) {
927 if (rc == -ENOMEM)
928 rc = SMC_CLC_DECL_MEM;
929 else
930 rc = SMC_CLC_DECL_INTERR;
931 }
932 return rc;
933 }
934
935 static int smc_write_space(struct smc_connection *conn)
936 {
937 int buffer_len = conn->peer_rmbe_size;
938 union smc_host_cursor prod;
939 union smc_host_cursor cons;
940 int space;
941
942 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
943 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
944 /* determine rx_buf space */
945 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
946 return space;
947 }
948
949 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
950 struct smc_wr_buf *wr_buf)
951 {
952 struct smc_connection *conn = &smc->conn;
953 union smc_host_cursor cons, fin;
954 int rc = 0;
955 int diff;
956
957 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
958 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
959 /* set prod cursor to old state, enforce tx_rdma_writes() */
960 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
961 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
962
963 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
964 /* cons cursor advanced more than fin, and prod was set
965 * fin above, so now prod is smaller than cons. Fix that.
966 */
967 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
968 smc_curs_add(conn->sndbuf_desc->len,
969 &conn->tx_curs_sent, diff);
970 smc_curs_add(conn->sndbuf_desc->len,
971 &conn->tx_curs_fin, diff);
972
973 smp_mb__before_atomic();
974 atomic_add(diff, &conn->sndbuf_space);
975 smp_mb__after_atomic();
976
977 smc_curs_add(conn->peer_rmbe_size,
978 &conn->local_tx_ctrl.prod, diff);
979 smc_curs_add(conn->peer_rmbe_size,
980 &conn->local_tx_ctrl_fin, diff);
981 }
982 /* recalculate, value is used by tx_rdma_writes() */
983 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
984
985 if (smc->sk.sk_state != SMC_INIT &&
986 smc->sk.sk_state != SMC_CLOSED) {
987 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
988 if (!rc) {
989 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
990 smc->sk.sk_data_ready(&smc->sk);
991 }
992 } else {
993 smc_wr_tx_put_slot(conn->lnk,
994 (struct smc_wr_tx_pend_priv *)pend);
995 }
996 return rc;
997 }
998
999 void smc_switch_link_and_count(struct smc_connection *conn,
1000 struct smc_link *to_lnk)
1001 {
1002 atomic_dec(&conn->lnk->conn_cnt);
1003 /* link_hold in smc_conn_create() */
1004 smcr_link_put(conn->lnk);
1005 conn->lnk = to_lnk;
1006 atomic_inc(&conn->lnk->conn_cnt);
1007 /* link_put in smc_conn_free() */
1008 smcr_link_hold(conn->lnk);
1009 }
1010
1011 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
1012 struct smc_link *from_lnk, bool is_dev_err)
1013 {
1014 struct smc_link *to_lnk = NULL;
1015 struct smc_cdc_tx_pend *pend;
1016 struct smc_connection *conn;
1017 struct smc_wr_buf *wr_buf;
1018 struct smc_sock *smc;
1019 struct rb_node *node;
1020 int i, rc = 0;
1021
1022 /* link is inactive, wake up tx waiters */
1023 smc_wr_wakeup_tx_wait(from_lnk);
1024
1025 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1026 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
1027 continue;
1028 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
1029 from_lnk->ibport == lgr->lnk[i].ibport) {
1030 continue;
1031 }
1032 to_lnk = &lgr->lnk[i];
1033 break;
1034 }
1035 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) {
1036 smc_lgr_terminate_sched(lgr);
1037 return NULL;
1038 }
1039 again:
1040 read_lock_bh(&lgr->conns_lock);
1041 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
1042 conn = rb_entry(node, struct smc_connection, alert_node);
1043 if (conn->lnk != from_lnk)
1044 continue;
1045 smc = container_of(conn, struct smc_sock, conn);
1046 /* conn->lnk not yet set in SMC_INIT state */
1047 if (smc->sk.sk_state == SMC_INIT)
1048 continue;
1049 if (smc->sk.sk_state == SMC_CLOSED ||
1050 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
1051 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
1052 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
1053 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
1054 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
1055 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
1056 smc->sk.sk_state == SMC_PEERABORTWAIT ||
1057 smc->sk.sk_state == SMC_PROCESSABORT) {
1058 spin_lock_bh(&conn->send_lock);
1059 smc_switch_link_and_count(conn, to_lnk);
1060 spin_unlock_bh(&conn->send_lock);
1061 continue;
1062 }
1063 sock_hold(&smc->sk);
1064 read_unlock_bh(&lgr->conns_lock);
1065 /* pre-fetch buffer outside of send_lock, might sleep */
1066 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
1067 if (rc)
1068 goto err_out;
1069 /* avoid race with smcr_tx_sndbuf_nonempty() */
1070 spin_lock_bh(&conn->send_lock);
1071 smc_switch_link_and_count(conn, to_lnk);
1072 rc = smc_switch_cursor(smc, pend, wr_buf);
1073 spin_unlock_bh(&conn->send_lock);
1074 sock_put(&smc->sk);
1075 if (rc)
1076 goto err_out;
1077 goto again;
1078 }
1079 read_unlock_bh(&lgr->conns_lock);
1080 smc_wr_tx_link_put(to_lnk);
1081 return to_lnk;
1082
1083 err_out:
1084 smcr_link_down_cond_sched(to_lnk);
1085 smc_wr_tx_link_put(to_lnk);
1086 return NULL;
1087 }
1088
1089 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
1090 struct smc_link_group *lgr)
1091 {
1092 int rc;
1093
1094 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1095 /* unregister rmb with peer */
1096 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1097 if (!rc) {
1098 /* protect against smc_llc_cli_rkey_exchange() */
1099 mutex_lock(&lgr->llc_conf_mutex);
1100 smc_llc_do_delete_rkey(lgr, rmb_desc);
1101 rmb_desc->is_conf_rkey = false;
1102 mutex_unlock(&lgr->llc_conf_mutex);
1103 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1104 }
1105 }
1106
1107 if (rmb_desc->is_reg_err) {
1108 /* buf registration failed, reuse not possible */
1109 mutex_lock(&lgr->rmbs_lock);
1110 list_del(&rmb_desc->list);
1111 mutex_unlock(&lgr->rmbs_lock);
1112
1113 smc_buf_free(lgr, true, rmb_desc);
1114 } else {
1115 rmb_desc->used = 0;
1116 memset(rmb_desc->cpu_addr, 0, rmb_desc->len);
1117 }
1118 }
1119
1120 static void smc_buf_unuse(struct smc_connection *conn,
1121 struct smc_link_group *lgr)
1122 {
1123 if (conn->sndbuf_desc) {
1124 conn->sndbuf_desc->used = 0;
1125 memset(conn->sndbuf_desc->cpu_addr, 0, conn->sndbuf_desc->len);
1126 }
1127 if (conn->rmb_desc && lgr->is_smcd) {
1128 conn->rmb_desc->used = 0;
1129 memset(conn->rmb_desc->cpu_addr, 0, conn->rmb_desc->len +
1130 sizeof(struct smcd_cdc_msg));
1131 } else if (conn->rmb_desc) {
1132 smcr_buf_unuse(conn->rmb_desc, lgr);
1133 }
1134 }
1135
1136 /* remove a finished connection from its link group */
1137 void smc_conn_free(struct smc_connection *conn)
1138 {
1139 struct smc_link_group *lgr = conn->lgr;
1140
1141 if (!lgr || conn->freed)
1142 /* Connection has never been registered in a
1143 * link group, or has already been freed.
1144 */
1145 return;
1146
1147 conn->freed = 1;
1148 if (!smc_conn_lgr_valid(conn))
1149 /* Connection has already unregistered from
1150 * link group.
1151 */
1152 goto lgr_put;
1153
1154 if (lgr->is_smcd) {
1155 if (!list_empty(&lgr->list))
1156 smc_ism_unset_conn(conn);
1157 tasklet_kill(&conn->rx_tsklet);
1158 } else {
1159 smc_cdc_wait_pend_tx_wr(conn);
1160 if (current_work() != &conn->abort_work)
1161 cancel_work_sync(&conn->abort_work);
1162 }
1163 if (!list_empty(&lgr->list)) {
1164 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1165 smc_lgr_unregister_conn(conn);
1166 }
1167
1168 if (!lgr->conns_num)
1169 smc_lgr_schedule_free_work(lgr);
1170 lgr_put:
1171 if (!lgr->is_smcd)
1172 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */
1173 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */
1174 }
1175
1176 /* unregister a link from a buf_desc */
1177 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1178 struct smc_link *lnk)
1179 {
1180 if (is_rmb)
1181 buf_desc->is_reg_mr[lnk->link_idx] = false;
1182 if (!buf_desc->is_map_ib[lnk->link_idx])
1183 return;
1184 if (is_rmb) {
1185 if (buf_desc->mr_rx[lnk->link_idx]) {
1186 smc_ib_put_memory_region(
1187 buf_desc->mr_rx[lnk->link_idx]);
1188 buf_desc->mr_rx[lnk->link_idx] = NULL;
1189 }
1190 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1191 } else {
1192 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1193 }
1194 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1195 buf_desc->is_map_ib[lnk->link_idx] = false;
1196 }
1197
1198 /* unmap all buffers of lgr for a deleted link */
1199 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1200 {
1201 struct smc_link_group *lgr = lnk->lgr;
1202 struct smc_buf_desc *buf_desc, *bf;
1203 int i;
1204
1205 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1206 mutex_lock(&lgr->rmbs_lock);
1207 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1208 smcr_buf_unmap_link(buf_desc, true, lnk);
1209 mutex_unlock(&lgr->rmbs_lock);
1210 mutex_lock(&lgr->sndbufs_lock);
1211 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1212 list)
1213 smcr_buf_unmap_link(buf_desc, false, lnk);
1214 mutex_unlock(&lgr->sndbufs_lock);
1215 }
1216 }
1217
1218 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1219 {
1220 struct smc_link_group *lgr = lnk->lgr;
1221 int i;
1222
1223 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1224 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1225 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1226 }
1227 }
1228
1229 static void __smcr_link_clear(struct smc_link *lnk)
1230 {
1231 struct smc_link_group *lgr = lnk->lgr;
1232 struct smc_ib_device *smcibdev;
1233
1234 smc_wr_free_link_mem(lnk);
1235 smc_ibdev_cnt_dec(lnk);
1236 put_device(&lnk->smcibdev->ibdev->dev);
1237 smcibdev = lnk->smcibdev;
1238 memset(lnk, 0, sizeof(struct smc_link));
1239 lnk->state = SMC_LNK_UNUSED;
1240 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1241 wake_up(&smcibdev->lnks_deleted);
1242 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */
1243 }
1244
1245 /* must be called under lgr->llc_conf_mutex lock */
1246 void smcr_link_clear(struct smc_link *lnk, bool log)
1247 {
1248 if (!lnk->lgr || lnk->clearing ||
1249 lnk->state == SMC_LNK_UNUSED)
1250 return;
1251 lnk->clearing = 1;
1252 lnk->peer_qpn = 0;
1253 smc_llc_link_clear(lnk, log);
1254 smcr_buf_unmap_lgr(lnk);
1255 smcr_rtoken_clear_link(lnk);
1256 smc_ib_modify_qp_error(lnk);
1257 smc_wr_free_link(lnk);
1258 smc_ib_destroy_queue_pair(lnk);
1259 smc_ib_dealloc_protection_domain(lnk);
1260 smcr_link_put(lnk); /* theoretically last link_put */
1261 }
1262
1263 void smcr_link_hold(struct smc_link *lnk)
1264 {
1265 refcount_inc(&lnk->refcnt);
1266 }
1267
1268 void smcr_link_put(struct smc_link *lnk)
1269 {
1270 if (refcount_dec_and_test(&lnk->refcnt))
1271 __smcr_link_clear(lnk);
1272 }
1273
1274 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1275 struct smc_buf_desc *buf_desc)
1276 {
1277 int i;
1278
1279 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1280 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1281
1282 if (buf_desc->pages)
1283 __free_pages(buf_desc->pages, buf_desc->order);
1284 kfree(buf_desc);
1285 }
1286
1287 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1288 struct smc_buf_desc *buf_desc)
1289 {
1290 if (is_dmb) {
1291 /* restore original buf len */
1292 buf_desc->len += sizeof(struct smcd_cdc_msg);
1293 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1294 } else {
1295 kfree(buf_desc->cpu_addr);
1296 }
1297 kfree(buf_desc);
1298 }
1299
1300 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1301 struct smc_buf_desc *buf_desc)
1302 {
1303 if (lgr->is_smcd)
1304 smcd_buf_free(lgr, is_rmb, buf_desc);
1305 else
1306 smcr_buf_free(lgr, is_rmb, buf_desc);
1307 }
1308
1309 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1310 {
1311 struct smc_buf_desc *buf_desc, *bf_desc;
1312 struct list_head *buf_list;
1313 int i;
1314
1315 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1316 if (is_rmb)
1317 buf_list = &lgr->rmbs[i];
1318 else
1319 buf_list = &lgr->sndbufs[i];
1320 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1321 list) {
1322 list_del(&buf_desc->list);
1323 smc_buf_free(lgr, is_rmb, buf_desc);
1324 }
1325 }
1326 }
1327
1328 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1329 {
1330 /* free send buffers */
1331 __smc_lgr_free_bufs(lgr, false);
1332 /* free rmbs */
1333 __smc_lgr_free_bufs(lgr, true);
1334 }
1335
1336 /* won't be freed until no one accesses to lgr anymore */
1337 static void __smc_lgr_free(struct smc_link_group *lgr)
1338 {
1339 smc_lgr_free_bufs(lgr);
1340 if (lgr->is_smcd) {
1341 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1342 wake_up(&lgr->smcd->lgrs_deleted);
1343 } else {
1344 smc_wr_free_lgr_mem(lgr);
1345 if (!atomic_dec_return(&lgr_cnt))
1346 wake_up(&lgrs_deleted);
1347 }
1348 kfree(lgr);
1349 }
1350
1351 /* remove a link group */
1352 static void smc_lgr_free(struct smc_link_group *lgr)
1353 {
1354 int i;
1355
1356 if (!lgr->is_smcd) {
1357 mutex_lock(&lgr->llc_conf_mutex);
1358 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1359 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1360 smcr_link_clear(&lgr->lnk[i], false);
1361 }
1362 mutex_unlock(&lgr->llc_conf_mutex);
1363 smc_llc_lgr_clear(lgr);
1364 }
1365
1366 destroy_workqueue(lgr->tx_wq);
1367 if (lgr->is_smcd) {
1368 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1369 put_device(&lgr->smcd->dev);
1370 }
1371 smc_lgr_put(lgr); /* theoretically last lgr_put */
1372 }
1373
1374 void smc_lgr_hold(struct smc_link_group *lgr)
1375 {
1376 refcount_inc(&lgr->refcnt);
1377 }
1378
1379 void smc_lgr_put(struct smc_link_group *lgr)
1380 {
1381 if (refcount_dec_and_test(&lgr->refcnt))
1382 __smc_lgr_free(lgr);
1383 }
1384
1385 static void smc_sk_wake_ups(struct smc_sock *smc)
1386 {
1387 smc->sk.sk_write_space(&smc->sk);
1388 smc->sk.sk_data_ready(&smc->sk);
1389 smc->sk.sk_state_change(&smc->sk);
1390 }
1391
1392 /* kill a connection */
1393 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1394 {
1395 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1396
1397 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1398 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1399 else
1400 smc_close_abort(conn);
1401 conn->killed = 1;
1402 smc->sk.sk_err = ECONNABORTED;
1403 smc_sk_wake_ups(smc);
1404 if (conn->lgr->is_smcd) {
1405 smc_ism_unset_conn(conn);
1406 if (soft)
1407 tasklet_kill(&conn->rx_tsklet);
1408 else
1409 tasklet_unlock_wait(&conn->rx_tsklet);
1410 } else {
1411 smc_cdc_wait_pend_tx_wr(conn);
1412 }
1413 smc_lgr_unregister_conn(conn);
1414 smc_close_active_abort(smc);
1415 }
1416
1417 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1418 {
1419 if (lgr->is_smcd) {
1420 smc_ism_signal_shutdown(lgr);
1421 } else {
1422 u32 rsn = lgr->llc_termination_rsn;
1423
1424 if (!rsn)
1425 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1426 smc_llc_send_link_delete_all(lgr, false, rsn);
1427 smcr_lgr_link_deactivate_all(lgr);
1428 }
1429 }
1430
1431 /* terminate link group
1432 * @soft: true if link group shutdown can take its time
1433 * false if immediate link group shutdown is required
1434 */
1435 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1436 {
1437 struct smc_connection *conn;
1438 struct smc_sock *smc;
1439 struct rb_node *node;
1440
1441 if (lgr->terminating)
1442 return; /* lgr already terminating */
1443 /* cancel free_work sync, will terminate when lgr->freeing is set */
1444 cancel_delayed_work_sync(&lgr->free_work);
1445 lgr->terminating = 1;
1446
1447 /* kill remaining link group connections */
1448 read_lock_bh(&lgr->conns_lock);
1449 node = rb_first(&lgr->conns_all);
1450 while (node) {
1451 read_unlock_bh(&lgr->conns_lock);
1452 conn = rb_entry(node, struct smc_connection, alert_node);
1453 smc = container_of(conn, struct smc_sock, conn);
1454 sock_hold(&smc->sk); /* sock_put below */
1455 lock_sock(&smc->sk);
1456 smc_conn_kill(conn, soft);
1457 release_sock(&smc->sk);
1458 sock_put(&smc->sk); /* sock_hold above */
1459 read_lock_bh(&lgr->conns_lock);
1460 node = rb_first(&lgr->conns_all);
1461 }
1462 read_unlock_bh(&lgr->conns_lock);
1463 smc_lgr_cleanup(lgr);
1464 smc_lgr_free(lgr);
1465 }
1466
1467 /* unlink link group and schedule termination */
1468 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1469 {
1470 spinlock_t *lgr_lock;
1471
1472 smc_lgr_list_head(lgr, &lgr_lock);
1473 spin_lock_bh(lgr_lock);
1474 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1475 spin_unlock_bh(lgr_lock);
1476 return; /* lgr already terminating */
1477 }
1478 list_del_init(&lgr->list);
1479 lgr->freeing = 1;
1480 spin_unlock_bh(lgr_lock);
1481 schedule_work(&lgr->terminate_work);
1482 }
1483
1484 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1485 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1486 {
1487 struct smc_link_group *lgr, *l;
1488 LIST_HEAD(lgr_free_list);
1489
1490 /* run common cleanup function and build free list */
1491 spin_lock_bh(&dev->lgr_lock);
1492 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1493 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1494 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1495 if (peer_gid) /* peer triggered termination */
1496 lgr->peer_shutdown = 1;
1497 list_move(&lgr->list, &lgr_free_list);
1498 lgr->freeing = 1;
1499 }
1500 }
1501 spin_unlock_bh(&dev->lgr_lock);
1502
1503 /* cancel the regular free workers and actually free lgrs */
1504 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1505 list_del_init(&lgr->list);
1506 schedule_work(&lgr->terminate_work);
1507 }
1508 }
1509
1510 /* Called when an SMCD device is removed or the smc module is unloaded */
1511 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1512 {
1513 struct smc_link_group *lgr, *lg;
1514 LIST_HEAD(lgr_free_list);
1515
1516 spin_lock_bh(&smcd->lgr_lock);
1517 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1518 list_for_each_entry(lgr, &lgr_free_list, list)
1519 lgr->freeing = 1;
1520 spin_unlock_bh(&smcd->lgr_lock);
1521
1522 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1523 list_del_init(&lgr->list);
1524 __smc_lgr_terminate(lgr, false);
1525 }
1526
1527 if (atomic_read(&smcd->lgr_cnt))
1528 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1529 }
1530
1531 /* Called when an SMCR device is removed or the smc module is unloaded.
1532 * If smcibdev is given, all SMCR link groups using this device are terminated.
1533 * If smcibdev is NULL, all SMCR link groups are terminated.
1534 */
1535 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1536 {
1537 struct smc_link_group *lgr, *lg;
1538 LIST_HEAD(lgr_free_list);
1539 int i;
1540
1541 spin_lock_bh(&smc_lgr_list.lock);
1542 if (!smcibdev) {
1543 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1544 list_for_each_entry(lgr, &lgr_free_list, list)
1545 lgr->freeing = 1;
1546 } else {
1547 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1548 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1549 if (lgr->lnk[i].smcibdev == smcibdev)
1550 smcr_link_down_cond_sched(&lgr->lnk[i]);
1551 }
1552 }
1553 }
1554 spin_unlock_bh(&smc_lgr_list.lock);
1555
1556 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1557 list_del_init(&lgr->list);
1558 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1559 __smc_lgr_terminate(lgr, false);
1560 }
1561
1562 if (smcibdev) {
1563 if (atomic_read(&smcibdev->lnk_cnt))
1564 wait_event(smcibdev->lnks_deleted,
1565 !atomic_read(&smcibdev->lnk_cnt));
1566 } else {
1567 if (atomic_read(&lgr_cnt))
1568 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1569 }
1570 }
1571
1572 /* set new lgr type and clear all asymmetric link tagging */
1573 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1574 {
1575 char *lgr_type = "";
1576 int i;
1577
1578 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1579 if (smc_link_usable(&lgr->lnk[i]))
1580 lgr->lnk[i].link_is_asym = false;
1581 if (lgr->type == new_type)
1582 return;
1583 lgr->type = new_type;
1584
1585 switch (lgr->type) {
1586 case SMC_LGR_NONE:
1587 lgr_type = "NONE";
1588 break;
1589 case SMC_LGR_SINGLE:
1590 lgr_type = "SINGLE";
1591 break;
1592 case SMC_LGR_SYMMETRIC:
1593 lgr_type = "SYMMETRIC";
1594 break;
1595 case SMC_LGR_ASYMMETRIC_PEER:
1596 lgr_type = "ASYMMETRIC_PEER";
1597 break;
1598 case SMC_LGR_ASYMMETRIC_LOCAL:
1599 lgr_type = "ASYMMETRIC_LOCAL";
1600 break;
1601 }
1602 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: "
1603 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1604 lgr->net->net_cookie, lgr_type, lgr->pnet_id);
1605 }
1606
1607 /* set new lgr type and tag a link as asymmetric */
1608 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1609 enum smc_lgr_type new_type, int asym_lnk_idx)
1610 {
1611 smcr_lgr_set_type(lgr, new_type);
1612 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1613 }
1614
1615 /* abort connection, abort_work scheduled from tasklet context */
1616 static void smc_conn_abort_work(struct work_struct *work)
1617 {
1618 struct smc_connection *conn = container_of(work,
1619 struct smc_connection,
1620 abort_work);
1621 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1622
1623 lock_sock(&smc->sk);
1624 smc_conn_kill(conn, true);
1625 release_sock(&smc->sk);
1626 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1627 }
1628
1629 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1630 {
1631 struct smc_link_group *lgr, *n;
1632
1633 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1634 struct smc_link *link;
1635
1636 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1637 SMC_MAX_PNETID_LEN) ||
1638 lgr->type == SMC_LGR_SYMMETRIC ||
1639 lgr->type == SMC_LGR_ASYMMETRIC_PEER ||
1640 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net))
1641 continue;
1642
1643 /* trigger local add link processing */
1644 link = smc_llc_usable_link(lgr);
1645 if (link)
1646 smc_llc_add_link_local(link);
1647 }
1648 }
1649
1650 /* link is down - switch connections to alternate link,
1651 * must be called under lgr->llc_conf_mutex lock
1652 */
1653 static void smcr_link_down(struct smc_link *lnk)
1654 {
1655 struct smc_link_group *lgr = lnk->lgr;
1656 struct smc_link *to_lnk;
1657 int del_link_id;
1658
1659 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1660 return;
1661
1662 to_lnk = smc_switch_conns(lgr, lnk, true);
1663 if (!to_lnk) { /* no backup link available */
1664 smcr_link_clear(lnk, true);
1665 return;
1666 }
1667 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1668 del_link_id = lnk->link_id;
1669
1670 if (lgr->role == SMC_SERV) {
1671 /* trigger local delete link processing */
1672 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1673 } else {
1674 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1675 /* another llc task is ongoing */
1676 mutex_unlock(&lgr->llc_conf_mutex);
1677 wait_event_timeout(lgr->llc_flow_waiter,
1678 (list_empty(&lgr->list) ||
1679 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1680 SMC_LLC_WAIT_TIME);
1681 mutex_lock(&lgr->llc_conf_mutex);
1682 }
1683 if (!list_empty(&lgr->list)) {
1684 smc_llc_send_delete_link(to_lnk, del_link_id,
1685 SMC_LLC_REQ, true,
1686 SMC_LLC_DEL_LOST_PATH);
1687 smcr_link_clear(lnk, true);
1688 }
1689 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1690 }
1691 }
1692
1693 /* must be called under lgr->llc_conf_mutex lock */
1694 void smcr_link_down_cond(struct smc_link *lnk)
1695 {
1696 if (smc_link_downing(&lnk->state)) {
1697 trace_smcr_link_down(lnk, __builtin_return_address(0));
1698 smcr_link_down(lnk);
1699 }
1700 }
1701
1702 /* will get the lgr->llc_conf_mutex lock */
1703 void smcr_link_down_cond_sched(struct smc_link *lnk)
1704 {
1705 if (smc_link_downing(&lnk->state)) {
1706 trace_smcr_link_down(lnk, __builtin_return_address(0));
1707 schedule_work(&lnk->link_down_wrk);
1708 }
1709 }
1710
1711 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1712 {
1713 struct smc_link_group *lgr, *n;
1714 int i;
1715
1716 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1717 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1718 SMC_MAX_PNETID_LEN))
1719 continue; /* lgr is not affected */
1720 if (list_empty(&lgr->list))
1721 continue;
1722 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1723 struct smc_link *lnk = &lgr->lnk[i];
1724
1725 if (smc_link_usable(lnk) &&
1726 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1727 smcr_link_down_cond_sched(lnk);
1728 }
1729 }
1730 }
1731
1732 static void smc_link_down_work(struct work_struct *work)
1733 {
1734 struct smc_link *link = container_of(work, struct smc_link,
1735 link_down_wrk);
1736 struct smc_link_group *lgr = link->lgr;
1737
1738 if (list_empty(&lgr->list))
1739 return;
1740 wake_up_all(&lgr->llc_msg_waiter);
1741 mutex_lock(&lgr->llc_conf_mutex);
1742 smcr_link_down(link);
1743 mutex_unlock(&lgr->llc_conf_mutex);
1744 }
1745
1746 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
1747 struct netdev_nested_priv *priv)
1748 {
1749 unsigned short *vlan_id = (unsigned short *)priv->data;
1750
1751 if (is_vlan_dev(lower_dev)) {
1752 *vlan_id = vlan_dev_vlan_id(lower_dev);
1753 return 1;
1754 }
1755
1756 return 0;
1757 }
1758
1759 /* Determine vlan of internal TCP socket. */
1760 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1761 {
1762 struct dst_entry *dst = sk_dst_get(clcsock->sk);
1763 struct netdev_nested_priv priv;
1764 struct net_device *ndev;
1765 int rc = 0;
1766
1767 ini->vlan_id = 0;
1768 if (!dst) {
1769 rc = -ENOTCONN;
1770 goto out;
1771 }
1772 if (!dst->dev) {
1773 rc = -ENODEV;
1774 goto out_rel;
1775 }
1776
1777 ndev = dst->dev;
1778 if (is_vlan_dev(ndev)) {
1779 ini->vlan_id = vlan_dev_vlan_id(ndev);
1780 goto out_rel;
1781 }
1782
1783 priv.data = (void *)&ini->vlan_id;
1784 rtnl_lock();
1785 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
1786 rtnl_unlock();
1787
1788 out_rel:
1789 dst_release(dst);
1790 out:
1791 return rc;
1792 }
1793
1794 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version,
1795 u8 peer_systemid[],
1796 u8 peer_gid[],
1797 u8 peer_mac_v1[],
1798 enum smc_lgr_role role, u32 clcqpn,
1799 struct net *net)
1800 {
1801 struct smc_link *lnk;
1802 int i;
1803
1804 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) ||
1805 lgr->role != role)
1806 return false;
1807
1808 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1809 lnk = &lgr->lnk[i];
1810
1811 if (!smc_link_active(lnk))
1812 continue;
1813 /* use verbs API to check netns, instead of lgr->net */
1814 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net))
1815 return false;
1816 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) &&
1817 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) &&
1818 (smcr_version == SMC_V2 ||
1819 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN)))
1820 return true;
1821 }
1822 return false;
1823 }
1824
1825 static bool smcd_lgr_match(struct smc_link_group *lgr,
1826 struct smcd_dev *smcismdev, u64 peer_gid)
1827 {
1828 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1829 }
1830
1831 /* create a new SMC connection (and a new link group if necessary) */
1832 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1833 {
1834 struct smc_connection *conn = &smc->conn;
1835 struct net *net = sock_net(&smc->sk);
1836 struct list_head *lgr_list;
1837 struct smc_link_group *lgr;
1838 enum smc_lgr_role role;
1839 spinlock_t *lgr_lock;
1840 int rc = 0;
1841
1842 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1843 &smc_lgr_list.list;
1844 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1845 &smc_lgr_list.lock;
1846 ini->first_contact_local = 1;
1847 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1848 if (role == SMC_CLNT && ini->first_contact_peer)
1849 /* create new link group as well */
1850 goto create;
1851
1852 /* determine if an existing link group can be reused */
1853 spin_lock_bh(lgr_lock);
1854 list_for_each_entry(lgr, lgr_list, list) {
1855 write_lock_bh(&lgr->conns_lock);
1856 if ((ini->is_smcd ?
1857 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1858 ini->ism_peer_gid[ini->ism_selected]) :
1859 smcr_lgr_match(lgr, ini->smcr_version,
1860 ini->peer_systemid,
1861 ini->peer_gid, ini->peer_mac, role,
1862 ini->ib_clcqpn, net)) &&
1863 !lgr->sync_err &&
1864 (ini->smcd_version == SMC_V2 ||
1865 lgr->vlan_id == ini->vlan_id) &&
1866 (role == SMC_CLNT || ini->is_smcd ||
1867 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX &&
1868 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
1869 /* link group found */
1870 ini->first_contact_local = 0;
1871 conn->lgr = lgr;
1872 rc = smc_lgr_register_conn(conn, false);
1873 write_unlock_bh(&lgr->conns_lock);
1874 if (!rc && delayed_work_pending(&lgr->free_work))
1875 cancel_delayed_work(&lgr->free_work);
1876 break;
1877 }
1878 write_unlock_bh(&lgr->conns_lock);
1879 }
1880 spin_unlock_bh(lgr_lock);
1881 if (rc)
1882 return rc;
1883
1884 if (role == SMC_CLNT && !ini->first_contact_peer &&
1885 ini->first_contact_local) {
1886 /* Server reuses a link group, but Client wants to start
1887 * a new one
1888 * send out_of_sync decline, reason synchr. error
1889 */
1890 return SMC_CLC_DECL_SYNCERR;
1891 }
1892
1893 create:
1894 if (ini->first_contact_local) {
1895 rc = smc_lgr_create(smc, ini);
1896 if (rc)
1897 goto out;
1898 lgr = conn->lgr;
1899 write_lock_bh(&lgr->conns_lock);
1900 rc = smc_lgr_register_conn(conn, true);
1901 write_unlock_bh(&lgr->conns_lock);
1902 if (rc) {
1903 smc_lgr_cleanup_early(lgr);
1904 goto out;
1905 }
1906 }
1907 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */
1908 if (!conn->lgr->is_smcd)
1909 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */
1910 conn->freed = 0;
1911 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1912 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1913 conn->urg_state = SMC_URG_READ;
1914 init_waitqueue_head(&conn->cdc_pend_tx_wq);
1915 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1916 if (ini->is_smcd) {
1917 conn->rx_off = sizeof(struct smcd_cdc_msg);
1918 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1919 } else {
1920 conn->rx_off = 0;
1921 }
1922 #ifndef KERNEL_HAS_ATOMIC64
1923 spin_lock_init(&conn->acurs_lock);
1924 #endif
1925
1926 out:
1927 return rc;
1928 }
1929
1930 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1931 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */
1932
1933 /* convert the RMB size into the compressed notation (minimum 16K, see
1934 * SMCD/R_DMBE_SIZES.
1935 * In contrast to plain ilog2, this rounds towards the next power of 2,
1936 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1937 */
1938 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
1939 {
1940 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE;
1941 u8 compressed;
1942
1943 if (size <= SMC_BUF_MIN_SIZE)
1944 return 0;
1945
1946 size = (size - 1) >> 14; /* convert to 16K multiple */
1947 compressed = min_t(u8, ilog2(size) + 1,
1948 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
1949
1950 if (!is_smcd && is_rmb)
1951 /* RMBs are backed by & limited to max size of scatterlists */
1952 compressed = min_t(u8, compressed, ilog2(max_scat >> 14));
1953
1954 return compressed;
1955 }
1956
1957 /* convert the RMB size from compressed notation into integer */
1958 int smc_uncompress_bufsize(u8 compressed)
1959 {
1960 u32 size;
1961
1962 size = 0x00000001 << (((int)compressed) + 14);
1963 return (int)size;
1964 }
1965
1966 /* try to reuse a sndbuf or rmb description slot for a certain
1967 * buffer size; if not available, return NULL
1968 */
1969 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1970 struct mutex *lock,
1971 struct list_head *buf_list)
1972 {
1973 struct smc_buf_desc *buf_slot;
1974
1975 mutex_lock(lock);
1976 list_for_each_entry(buf_slot, buf_list, list) {
1977 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1978 mutex_unlock(lock);
1979 return buf_slot;
1980 }
1981 }
1982 mutex_unlock(lock);
1983 return NULL;
1984 }
1985
1986 /* one of the conditions for announcing a receiver's current window size is
1987 * that it "results in a minimum increase in the window size of 10% of the
1988 * receive buffer space" [RFC7609]
1989 */
1990 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1991 {
1992 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1993 }
1994
1995 /* map an rmb buf to a link */
1996 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1997 struct smc_link *lnk)
1998 {
1999 int rc;
2000
2001 if (buf_desc->is_map_ib[lnk->link_idx])
2002 return 0;
2003
2004 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
2005 if (rc)
2006 return rc;
2007 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
2008 buf_desc->cpu_addr, buf_desc->len);
2009
2010 /* map sg table to DMA address */
2011 rc = smc_ib_buf_map_sg(lnk, buf_desc,
2012 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2013 /* SMC protocol depends on mapping to one DMA address only */
2014 if (rc != 1) {
2015 rc = -EAGAIN;
2016 goto free_table;
2017 }
2018
2019 /* create a new memory region for the RMB */
2020 if (is_rmb) {
2021 rc = smc_ib_get_memory_region(lnk->roce_pd,
2022 IB_ACCESS_REMOTE_WRITE |
2023 IB_ACCESS_LOCAL_WRITE,
2024 buf_desc, lnk->link_idx);
2025 if (rc)
2026 goto buf_unmap;
2027 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
2028 }
2029 buf_desc->is_map_ib[lnk->link_idx] = true;
2030 return 0;
2031
2032 buf_unmap:
2033 smc_ib_buf_unmap_sg(lnk, buf_desc,
2034 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2035 free_table:
2036 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
2037 return rc;
2038 }
2039
2040 /* register a new rmb on IB device,
2041 * must be called under lgr->llc_conf_mutex lock
2042 */
2043 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
2044 {
2045 if (list_empty(&link->lgr->list))
2046 return -ENOLINK;
2047 if (!rmb_desc->is_reg_mr[link->link_idx]) {
2048 /* register memory region for new rmb */
2049 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
2050 rmb_desc->is_reg_err = true;
2051 return -EFAULT;
2052 }
2053 rmb_desc->is_reg_mr[link->link_idx] = true;
2054 }
2055 return 0;
2056 }
2057
2058 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
2059 struct list_head *lst, bool is_rmb)
2060 {
2061 struct smc_buf_desc *buf_desc, *bf;
2062 int rc = 0;
2063
2064 mutex_lock(lock);
2065 list_for_each_entry_safe(buf_desc, bf, lst, list) {
2066 if (!buf_desc->used)
2067 continue;
2068 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
2069 if (rc)
2070 goto out;
2071 }
2072 out:
2073 mutex_unlock(lock);
2074 return rc;
2075 }
2076
2077 /* map all used buffers of lgr for a new link */
2078 int smcr_buf_map_lgr(struct smc_link *lnk)
2079 {
2080 struct smc_link_group *lgr = lnk->lgr;
2081 int i, rc = 0;
2082
2083 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2084 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
2085 &lgr->rmbs[i], true);
2086 if (rc)
2087 return rc;
2088 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
2089 &lgr->sndbufs[i], false);
2090 if (rc)
2091 return rc;
2092 }
2093 return 0;
2094 }
2095
2096 /* register all used buffers of lgr for a new link,
2097 * must be called under lgr->llc_conf_mutex lock
2098 */
2099 int smcr_buf_reg_lgr(struct smc_link *lnk)
2100 {
2101 struct smc_link_group *lgr = lnk->lgr;
2102 struct smc_buf_desc *buf_desc, *bf;
2103 int i, rc = 0;
2104
2105 mutex_lock(&lgr->rmbs_lock);
2106 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2107 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
2108 if (!buf_desc->used)
2109 continue;
2110 rc = smcr_link_reg_rmb(lnk, buf_desc);
2111 if (rc)
2112 goto out;
2113 }
2114 }
2115 out:
2116 mutex_unlock(&lgr->rmbs_lock);
2117 return rc;
2118 }
2119
2120 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
2121 bool is_rmb, int bufsize)
2122 {
2123 struct smc_buf_desc *buf_desc;
2124
2125 /* try to alloc a new buffer */
2126 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2127 if (!buf_desc)
2128 return ERR_PTR(-ENOMEM);
2129
2130 buf_desc->order = get_order(bufsize);
2131 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
2132 __GFP_NOMEMALLOC | __GFP_COMP |
2133 __GFP_NORETRY | __GFP_ZERO,
2134 buf_desc->order);
2135 if (!buf_desc->pages) {
2136 kfree(buf_desc);
2137 return ERR_PTR(-EAGAIN);
2138 }
2139 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
2140 buf_desc->len = bufsize;
2141 return buf_desc;
2142 }
2143
2144 /* map buf_desc on all usable links,
2145 * unused buffers stay mapped as long as the link is up
2146 */
2147 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
2148 struct smc_buf_desc *buf_desc, bool is_rmb)
2149 {
2150 int i, rc = 0;
2151
2152 /* protect against parallel link reconfiguration */
2153 mutex_lock(&lgr->llc_conf_mutex);
2154 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2155 struct smc_link *lnk = &lgr->lnk[i];
2156
2157 if (!smc_link_usable(lnk))
2158 continue;
2159 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
2160 rc = -ENOMEM;
2161 goto out;
2162 }
2163 }
2164 out:
2165 mutex_unlock(&lgr->llc_conf_mutex);
2166 return rc;
2167 }
2168
2169 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2170 bool is_dmb, int bufsize)
2171 {
2172 struct smc_buf_desc *buf_desc;
2173 int rc;
2174
2175 /* try to alloc a new DMB */
2176 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2177 if (!buf_desc)
2178 return ERR_PTR(-ENOMEM);
2179 if (is_dmb) {
2180 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2181 if (rc) {
2182 kfree(buf_desc);
2183 if (rc == -ENOMEM)
2184 return ERR_PTR(-EAGAIN);
2185 if (rc == -ENOSPC)
2186 return ERR_PTR(-ENOSPC);
2187 return ERR_PTR(-EIO);
2188 }
2189 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2190 /* CDC header stored in buf. So, pretend it was smaller */
2191 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2192 } else {
2193 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2194 __GFP_NOWARN | __GFP_NORETRY |
2195 __GFP_NOMEMALLOC);
2196 if (!buf_desc->cpu_addr) {
2197 kfree(buf_desc);
2198 return ERR_PTR(-EAGAIN);
2199 }
2200 buf_desc->len = bufsize;
2201 }
2202 return buf_desc;
2203 }
2204
2205 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2206 {
2207 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2208 struct smc_connection *conn = &smc->conn;
2209 struct smc_link_group *lgr = conn->lgr;
2210 struct list_head *buf_list;
2211 int bufsize, bufsize_short;
2212 bool is_dgraded = false;
2213 struct mutex *lock; /* lock buffer list */
2214 int sk_buf_size;
2215
2216 if (is_rmb)
2217 /* use socket recv buffer size (w/o overhead) as start value */
2218 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2219 else
2220 /* use socket send buffer size (w/o overhead) as start value */
2221 sk_buf_size = smc->sk.sk_sndbuf / 2;
2222
2223 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb);
2224 bufsize_short >= 0; bufsize_short--) {
2225 if (is_rmb) {
2226 lock = &lgr->rmbs_lock;
2227 buf_list = &lgr->rmbs[bufsize_short];
2228 } else {
2229 lock = &lgr->sndbufs_lock;
2230 buf_list = &lgr->sndbufs[bufsize_short];
2231 }
2232 bufsize = smc_uncompress_bufsize(bufsize_short);
2233
2234 /* check for reusable slot in the link group */
2235 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2236 if (buf_desc) {
2237 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2238 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
2239 break; /* found reusable slot */
2240 }
2241
2242 if (is_smcd)
2243 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2244 else
2245 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2246
2247 if (PTR_ERR(buf_desc) == -ENOMEM)
2248 break;
2249 if (IS_ERR(buf_desc)) {
2250 if (!is_dgraded) {
2251 is_dgraded = true;
2252 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
2253 }
2254 continue;
2255 }
2256
2257 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
2258 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2259 buf_desc->used = 1;
2260 mutex_lock(lock);
2261 list_add(&buf_desc->list, buf_list);
2262 mutex_unlock(lock);
2263 break; /* found */
2264 }
2265
2266 if (IS_ERR(buf_desc))
2267 return PTR_ERR(buf_desc);
2268
2269 if (!is_smcd) {
2270 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2271 smcr_buf_unuse(buf_desc, lgr);
2272 return -ENOMEM;
2273 }
2274 }
2275
2276 if (is_rmb) {
2277 conn->rmb_desc = buf_desc;
2278 conn->rmbe_size_short = bufsize_short;
2279 smc->sk.sk_rcvbuf = bufsize * 2;
2280 atomic_set(&conn->bytes_to_rcv, 0);
2281 conn->rmbe_update_limit =
2282 smc_rmb_wnd_update_limit(buf_desc->len);
2283 if (is_smcd)
2284 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2285 } else {
2286 conn->sndbuf_desc = buf_desc;
2287 smc->sk.sk_sndbuf = bufsize * 2;
2288 atomic_set(&conn->sndbuf_space, bufsize);
2289 }
2290 return 0;
2291 }
2292
2293 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2294 {
2295 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd ||
2296 !smc_link_active(conn->lnk))
2297 return;
2298 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2299 }
2300
2301 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2302 {
2303 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd ||
2304 !smc_link_active(conn->lnk))
2305 return;
2306 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2307 }
2308
2309 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2310 {
2311 int i;
2312
2313 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd)
2314 return;
2315 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2316 if (!smc_link_active(&conn->lgr->lnk[i]))
2317 continue;
2318 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2319 DMA_FROM_DEVICE);
2320 }
2321 }
2322
2323 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2324 {
2325 int i;
2326
2327 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd)
2328 return;
2329 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2330 if (!smc_link_active(&conn->lgr->lnk[i]))
2331 continue;
2332 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2333 DMA_FROM_DEVICE);
2334 }
2335 }
2336
2337 /* create the send and receive buffer for an SMC socket;
2338 * receive buffers are called RMBs;
2339 * (even though the SMC protocol allows more than one RMB-element per RMB,
2340 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2341 * extra RMB for every connection in a link group
2342 */
2343 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2344 {
2345 int rc;
2346
2347 /* create send buffer */
2348 rc = __smc_buf_create(smc, is_smcd, false);
2349 if (rc)
2350 return rc;
2351 /* create rmb */
2352 rc = __smc_buf_create(smc, is_smcd, true);
2353 if (rc) {
2354 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2355 list_del(&smc->conn.sndbuf_desc->list);
2356 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2357 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2358 smc->conn.sndbuf_desc = NULL;
2359 }
2360 return rc;
2361 }
2362
2363 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2364 {
2365 int i;
2366
2367 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2368 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2369 return i;
2370 }
2371 return -ENOSPC;
2372 }
2373
2374 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2375 u32 rkey)
2376 {
2377 int i;
2378
2379 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2380 if (test_bit(i, lgr->rtokens_used_mask) &&
2381 lgr->rtokens[i][lnk_idx].rkey == rkey)
2382 return i;
2383 }
2384 return -ENOENT;
2385 }
2386
2387 /* set rtoken for a new link to an existing rmb */
2388 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2389 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2390 {
2391 int rtok_idx;
2392
2393 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2394 if (rtok_idx == -ENOENT)
2395 return;
2396 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2397 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2398 }
2399
2400 /* set rtoken for a new link whose link_id is given */
2401 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2402 __be64 nw_vaddr, __be32 nw_rkey)
2403 {
2404 u64 dma_addr = be64_to_cpu(nw_vaddr);
2405 u32 rkey = ntohl(nw_rkey);
2406 bool found = false;
2407 int link_idx;
2408
2409 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2410 if (lgr->lnk[link_idx].link_id == link_id) {
2411 found = true;
2412 break;
2413 }
2414 }
2415 if (!found)
2416 return;
2417 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2418 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2419 }
2420
2421 /* add a new rtoken from peer */
2422 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2423 {
2424 struct smc_link_group *lgr = smc_get_lgr(lnk);
2425 u64 dma_addr = be64_to_cpu(nw_vaddr);
2426 u32 rkey = ntohl(nw_rkey);
2427 int i;
2428
2429 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2430 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2431 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2432 test_bit(i, lgr->rtokens_used_mask)) {
2433 /* already in list */
2434 return i;
2435 }
2436 }
2437 i = smc_rmb_reserve_rtoken_idx(lgr);
2438 if (i < 0)
2439 return i;
2440 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2441 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2442 return i;
2443 }
2444
2445 /* delete an rtoken from all links */
2446 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2447 {
2448 struct smc_link_group *lgr = smc_get_lgr(lnk);
2449 u32 rkey = ntohl(nw_rkey);
2450 int i, j;
2451
2452 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2453 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2454 test_bit(i, lgr->rtokens_used_mask)) {
2455 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2456 lgr->rtokens[i][j].rkey = 0;
2457 lgr->rtokens[i][j].dma_addr = 0;
2458 }
2459 clear_bit(i, lgr->rtokens_used_mask);
2460 return 0;
2461 }
2462 }
2463 return -ENOENT;
2464 }
2465
2466 /* save rkey and dma_addr received from peer during clc handshake */
2467 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2468 struct smc_link *lnk,
2469 struct smc_clc_msg_accept_confirm *clc)
2470 {
2471 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2472 clc->r0.rmb_rkey);
2473 if (conn->rtoken_idx < 0)
2474 return conn->rtoken_idx;
2475 return 0;
2476 }
2477
2478 static void smc_core_going_away(void)
2479 {
2480 struct smc_ib_device *smcibdev;
2481 struct smcd_dev *smcd;
2482
2483 mutex_lock(&smc_ib_devices.mutex);
2484 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2485 int i;
2486
2487 for (i = 0; i < SMC_MAX_PORTS; i++)
2488 set_bit(i, smcibdev->ports_going_away);
2489 }
2490 mutex_unlock(&smc_ib_devices.mutex);
2491
2492 mutex_lock(&smcd_dev_list.mutex);
2493 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2494 smcd->going_away = 1;
2495 }
2496 mutex_unlock(&smcd_dev_list.mutex);
2497 }
2498
2499 /* Clean up all SMC link groups */
2500 static void smc_lgrs_shutdown(void)
2501 {
2502 struct smcd_dev *smcd;
2503
2504 smc_core_going_away();
2505
2506 smc_smcr_terminate_all(NULL);
2507
2508 mutex_lock(&smcd_dev_list.mutex);
2509 list_for_each_entry(smcd, &smcd_dev_list.list, list)
2510 smc_smcd_terminate_all(smcd);
2511 mutex_unlock(&smcd_dev_list.mutex);
2512 }
2513
2514 static int smc_core_reboot_event(struct notifier_block *this,
2515 unsigned long event, void *ptr)
2516 {
2517 smc_lgrs_shutdown();
2518 smc_ib_unregister_client();
2519 return 0;
2520 }
2521
2522 static struct notifier_block smc_reboot_notifier = {
2523 .notifier_call = smc_core_reboot_event,
2524 };
2525
2526 int __init smc_core_init(void)
2527 {
2528 return register_reboot_notifier(&smc_reboot_notifier);
2529 }
2530
2531 /* Called (from smc_exit) when module is removed */
2532 void smc_core_exit(void)
2533 {
2534 unregister_reboot_notifier(&smc_reboot_notifier);
2535 smc_lgrs_shutdown();
2536 }
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