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12#include <linux/module.h>
13#include <linux/list.h>
14#include <linux/ctype.h>
15#include <linux/mutex.h>
16#include <net/netlink.h>
17#include <net/genetlink.h>
18
19#include <uapi/linux/if.h>
20#include <uapi/linux/smc.h>
21
22#include <rdma/ib_verbs.h>
23
24#include <net/netns/generic.h>
25#include "smc_netns.h"
26
27#include "smc_pnet.h"
28#include "smc_ib.h"
29#include "smc_ism.h"
30#include "smc_core.h"
31
32static struct net_device *__pnet_find_base_ndev(struct net_device *ndev);
33static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
34
35static const struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
36 [SMC_PNETID_NAME] = {
37 .type = NLA_NUL_STRING,
38 .len = SMC_MAX_PNETID_LEN
39 },
40 [SMC_PNETID_ETHNAME] = {
41 .type = NLA_NUL_STRING,
42 .len = IFNAMSIZ - 1
43 },
44 [SMC_PNETID_IBNAME] = {
45 .type = NLA_NUL_STRING,
46 .len = IB_DEVICE_NAME_MAX - 1
47 },
48 [SMC_PNETID_IBPORT] = { .type = NLA_U8 }
49};
50
51static struct genl_family smc_pnet_nl_family;
52
53enum smc_pnet_nametype {
54 SMC_PNET_ETH = 1,
55 SMC_PNET_IB = 2,
56};
57
58
59struct smc_pnetentry {
60 struct list_head list;
61 char pnet_name[SMC_MAX_PNETID_LEN + 1];
62 enum smc_pnet_nametype type;
63 union {
64 struct {
65 char eth_name[IFNAMSIZ + 1];
66 struct net_device *ndev;
67 };
68 struct {
69 char ib_name[IB_DEVICE_NAME_MAX + 1];
70 u8 ib_port;
71 };
72 };
73};
74
75
76bool smc_pnet_is_pnetid_set(u8 *pnetid)
77{
78 if (pnetid[0] == 0 || pnetid[0] == _S)
79 return false;
80 return true;
81}
82
83
84static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
85{
86 int i;
87
88 for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
89 if ((pnetid1[i] == 0 || pnetid1[i] == _S) &&
90 (pnetid2[i] == 0 || pnetid2[i] == _S))
91 break;
92 if (pnetid1[i] != pnetid2[i])
93 return false;
94 }
95 return true;
96}
97
98
99
100static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
101{
102 struct smc_pnetentry *pnetelem, *tmp_pe;
103 struct smc_pnettable *pnettable;
104 struct smc_ib_device *ibdev;
105 struct smcd_dev *smcd_dev;
106 struct smc_net *sn;
107 int rc = -ENOENT;
108 int ibport;
109
110
111 sn = net_generic(net, smc_net_id);
112 pnettable = &sn->pnettable;
113
114
115 write_lock(&pnettable->lock);
116 list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
117 list) {
118 if (!pnet_name ||
119 smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
120 list_del(&pnetelem->list);
121 if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev) {
122 dev_put(pnetelem->ndev);
123 pr_warn_ratelimited("smc: net device %s "
124 "erased user defined "
125 "pnetid %.16s\n",
126 pnetelem->eth_name,
127 pnetelem->pnet_name);
128 }
129 kfree(pnetelem);
130 rc = 0;
131 }
132 }
133 write_unlock(&pnettable->lock);
134
135
136 if (net != &init_net)
137 return rc;
138
139
140 mutex_lock(&smc_ib_devices.mutex);
141 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
142 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
143 if (ibdev->pnetid_by_user[ibport] &&
144 (!pnet_name ||
145 smc_pnet_match(pnet_name,
146 ibdev->pnetid[ibport]))) {
147 pr_warn_ratelimited("smc: ib device %s ibport "
148 "%d erased user defined "
149 "pnetid %.16s\n",
150 ibdev->ibdev->name,
151 ibport + 1,
152 ibdev->pnetid[ibport]);
153 memset(ibdev->pnetid[ibport], 0,
154 SMC_MAX_PNETID_LEN);
155 ibdev->pnetid_by_user[ibport] = false;
156 rc = 0;
157 }
158 }
159 }
160 mutex_unlock(&smc_ib_devices.mutex);
161
162 mutex_lock(&smcd_dev_list.mutex);
163 list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
164 if (smcd_dev->pnetid_by_user &&
165 (!pnet_name ||
166 smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
167 pr_warn_ratelimited("smc: smcd device %s "
168 "erased user defined pnetid "
169 "%.16s\n", dev_name(&smcd_dev->dev),
170 smcd_dev->pnetid);
171 memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
172 smcd_dev->pnetid_by_user = false;
173 rc = 0;
174 }
175 }
176 mutex_unlock(&smcd_dev_list.mutex);
177 return rc;
178}
179
180
181
182static int smc_pnet_add_by_ndev(struct net_device *ndev)
183{
184 struct smc_pnetentry *pnetelem, *tmp_pe;
185 struct smc_pnettable *pnettable;
186 struct net *net = dev_net(ndev);
187 struct smc_net *sn;
188 int rc = -ENOENT;
189
190
191 sn = net_generic(net, smc_net_id);
192 pnettable = &sn->pnettable;
193
194 write_lock(&pnettable->lock);
195 list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
196 if (pnetelem->type == SMC_PNET_ETH && !pnetelem->ndev &&
197 !strncmp(pnetelem->eth_name, ndev->name, IFNAMSIZ)) {
198 dev_hold(ndev);
199 pnetelem->ndev = ndev;
200 rc = 0;
201 pr_warn_ratelimited("smc: adding net device %s with "
202 "user defined pnetid %.16s\n",
203 pnetelem->eth_name,
204 pnetelem->pnet_name);
205 break;
206 }
207 }
208 write_unlock(&pnettable->lock);
209 return rc;
210}
211
212
213
214static int smc_pnet_remove_by_ndev(struct net_device *ndev)
215{
216 struct smc_pnetentry *pnetelem, *tmp_pe;
217 struct smc_pnettable *pnettable;
218 struct net *net = dev_net(ndev);
219 struct smc_net *sn;
220 int rc = -ENOENT;
221
222
223 sn = net_generic(net, smc_net_id);
224 pnettable = &sn->pnettable;
225
226 write_lock(&pnettable->lock);
227 list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
228 if (pnetelem->type == SMC_PNET_ETH && pnetelem->ndev == ndev) {
229 dev_put(pnetelem->ndev);
230 pnetelem->ndev = NULL;
231 rc = 0;
232 pr_warn_ratelimited("smc: removing net device %s with "
233 "user defined pnetid %.16s\n",
234 pnetelem->eth_name,
235 pnetelem->pnet_name);
236 break;
237 }
238 }
239 write_unlock(&pnettable->lock);
240 return rc;
241}
242
243
244
245static bool smc_pnet_apply_ib(struct smc_ib_device *ib_dev, u8 ib_port,
246 char *pnet_name)
247{
248 bool applied = false;
249
250 mutex_lock(&smc_ib_devices.mutex);
251 if (!smc_pnet_is_pnetid_set(ib_dev->pnetid[ib_port - 1])) {
252 memcpy(ib_dev->pnetid[ib_port - 1], pnet_name,
253 SMC_MAX_PNETID_LEN);
254 ib_dev->pnetid_by_user[ib_port - 1] = true;
255 applied = true;
256 }
257 mutex_unlock(&smc_ib_devices.mutex);
258 return applied;
259}
260
261
262
263static bool smc_pnet_apply_smcd(struct smcd_dev *smcd_dev, char *pnet_name)
264{
265 bool applied = false;
266
267 mutex_lock(&smcd_dev_list.mutex);
268 if (!smc_pnet_is_pnetid_set(smcd_dev->pnetid)) {
269 memcpy(smcd_dev->pnetid, pnet_name, SMC_MAX_PNETID_LEN);
270 smcd_dev->pnetid_by_user = true;
271 applied = true;
272 }
273 mutex_unlock(&smcd_dev_list.mutex);
274 return applied;
275}
276
277
278
279
280
281
282static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
283{
284 char *bf = skip_spaces(pnet_name);
285 size_t len = strlen(bf);
286 char *end = bf + len;
287
288 if (!len)
289 return false;
290 while (--end >= bf && isspace(*end))
291 ;
292 if (end - bf >= SMC_MAX_PNETID_LEN)
293 return false;
294 while (bf <= end) {
295 if (!isalnum(*bf))
296 return false;
297 *pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
298 bf++;
299 }
300 *pnetid = '\0';
301 return true;
302}
303
304
305static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
306{
307 struct smc_ib_device *ibdev;
308
309 mutex_lock(&smc_ib_devices.mutex);
310 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
311 if (!strncmp(ibdev->ibdev->name, ib_name,
312 sizeof(ibdev->ibdev->name)) ||
313 !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
314 IB_DEVICE_NAME_MAX - 1)) {
315 goto out;
316 }
317 }
318 ibdev = NULL;
319out:
320 mutex_unlock(&smc_ib_devices.mutex);
321 return ibdev;
322}
323
324
325static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
326{
327 struct smcd_dev *smcd_dev;
328
329 mutex_lock(&smcd_dev_list.mutex);
330 list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
331 if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
332 IB_DEVICE_NAME_MAX - 1))
333 goto out;
334 }
335 smcd_dev = NULL;
336out:
337 mutex_unlock(&smcd_dev_list.mutex);
338 return smcd_dev;
339}
340
341static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net,
342 char *eth_name, char *pnet_name)
343{
344 struct smc_pnetentry *tmp_pe, *new_pe;
345 struct net_device *ndev, *base_ndev;
346 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
347 bool new_netdev;
348 int rc;
349
350
351
352
353 rc = -EEXIST;
354 ndev = dev_get_by_name(net, eth_name);
355 if (ndev) {
356 base_ndev = pnet_find_base_ndev(ndev);
357 if (!smc_pnetid_by_dev_port(base_ndev->dev.parent,
358 base_ndev->dev_port, ndev_pnetid))
359 goto out_put;
360 }
361
362
363 rc = -ENOMEM;
364 new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
365 if (!new_pe)
366 goto out_put;
367 new_pe->type = SMC_PNET_ETH;
368 memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
369 strncpy(new_pe->eth_name, eth_name, IFNAMSIZ);
370 new_pe->ndev = ndev;
371
372 rc = -EEXIST;
373 new_netdev = true;
374 write_lock(&pnettable->lock);
375 list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
376 if (tmp_pe->type == SMC_PNET_ETH &&
377 !strncmp(tmp_pe->eth_name, eth_name, IFNAMSIZ)) {
378 new_netdev = false;
379 break;
380 }
381 }
382 if (new_netdev) {
383 list_add_tail(&new_pe->list, &pnettable->pnetlist);
384 write_unlock(&pnettable->lock);
385 } else {
386 write_unlock(&pnettable->lock);
387 kfree(new_pe);
388 goto out_put;
389 }
390 if (ndev)
391 pr_warn_ratelimited("smc: net device %s "
392 "applied user defined pnetid %.16s\n",
393 new_pe->eth_name, new_pe->pnet_name);
394 return 0;
395
396out_put:
397 dev_put(ndev);
398 return rc;
399}
400
401static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name,
402 u8 ib_port, char *pnet_name)
403{
404 struct smc_pnetentry *tmp_pe, *new_pe;
405 struct smc_ib_device *ib_dev;
406 bool smcddev_applied = true;
407 bool ibdev_applied = true;
408 struct smcd_dev *smcd_dev;
409 bool new_ibdev;
410
411
412 ib_dev = smc_pnet_find_ib(ib_name);
413 if (ib_dev) {
414 ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name);
415 if (ibdev_applied)
416 pr_warn_ratelimited("smc: ib device %s ibport %d "
417 "applied user defined pnetid "
418 "%.16s\n", ib_dev->ibdev->name,
419 ib_port,
420 ib_dev->pnetid[ib_port - 1]);
421 }
422 smcd_dev = smc_pnet_find_smcd(ib_name);
423 if (smcd_dev) {
424 smcddev_applied = smc_pnet_apply_smcd(smcd_dev, pnet_name);
425 if (smcddev_applied)
426 pr_warn_ratelimited("smc: smcd device %s "
427 "applied user defined pnetid "
428 "%.16s\n", dev_name(&smcd_dev->dev),
429 smcd_dev->pnetid);
430 }
431
432
433
434 if (!ibdev_applied || !smcddev_applied)
435 return -EEXIST;
436
437
438 new_pe = kzalloc(sizeof(*new_pe), GFP_KERNEL);
439 if (!new_pe)
440 return -ENOMEM;
441 new_pe->type = SMC_PNET_IB;
442 memcpy(new_pe->pnet_name, pnet_name, SMC_MAX_PNETID_LEN);
443 strncpy(new_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX);
444 new_pe->ib_port = ib_port;
445
446 new_ibdev = true;
447 write_lock(&pnettable->lock);
448 list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
449 if (tmp_pe->type == SMC_PNET_IB &&
450 !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
451 new_ibdev = false;
452 break;
453 }
454 }
455 if (new_ibdev) {
456 list_add_tail(&new_pe->list, &pnettable->pnetlist);
457 write_unlock(&pnettable->lock);
458 } else {
459 write_unlock(&pnettable->lock);
460 kfree(new_pe);
461 }
462 return (new_ibdev) ? 0 : -EEXIST;
463}
464
465
466
467static int smc_pnet_enter(struct net *net, struct nlattr *tb[])
468{
469 char pnet_name[SMC_MAX_PNETID_LEN + 1];
470 struct smc_pnettable *pnettable;
471 bool new_netdev = false;
472 bool new_ibdev = false;
473 struct smc_net *sn;
474 u8 ibport = 1;
475 char *string;
476 int rc;
477
478
479 sn = net_generic(net, smc_net_id);
480 pnettable = &sn->pnettable;
481
482 rc = -EINVAL;
483 if (!tb[SMC_PNETID_NAME])
484 goto error;
485 string = (char *)nla_data(tb[SMC_PNETID_NAME]);
486 if (!smc_pnetid_valid(string, pnet_name))
487 goto error;
488
489 if (tb[SMC_PNETID_ETHNAME]) {
490 string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
491 rc = smc_pnet_add_eth(pnettable, net, string, pnet_name);
492 if (!rc)
493 new_netdev = true;
494 else if (rc != -EEXIST)
495 goto error;
496 }
497
498
499 if (net != &init_net)
500 return new_netdev ? 0 : -EEXIST;
501
502 rc = -EINVAL;
503 if (tb[SMC_PNETID_IBNAME]) {
504 string = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
505 string = strim(string);
506 if (tb[SMC_PNETID_IBPORT]) {
507 ibport = nla_get_u8(tb[SMC_PNETID_IBPORT]);
508 if (ibport < 1 || ibport > SMC_MAX_PORTS)
509 goto error;
510 }
511 rc = smc_pnet_add_ib(pnettable, string, ibport, pnet_name);
512 if (!rc)
513 new_ibdev = true;
514 else if (rc != -EEXIST)
515 goto error;
516 }
517 return (new_netdev || new_ibdev) ? 0 : -EEXIST;
518
519error:
520 return rc;
521}
522
523
524static int smc_pnet_set_nla(struct sk_buff *msg,
525 struct smc_pnetentry *pnetelem)
526{
527 if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
528 return -1;
529 if (pnetelem->type == SMC_PNET_ETH) {
530 if (nla_put_string(msg, SMC_PNETID_ETHNAME,
531 pnetelem->eth_name))
532 return -1;
533 } else {
534 if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
535 return -1;
536 }
537 if (pnetelem->type == SMC_PNET_IB) {
538 if (nla_put_string(msg, SMC_PNETID_IBNAME, pnetelem->ib_name) ||
539 nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
540 return -1;
541 } else {
542 if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
543 nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
544 return -1;
545 }
546
547 return 0;
548}
549
550static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
551{
552 struct net *net = genl_info_net(info);
553
554 return smc_pnet_enter(net, info->attrs);
555}
556
557static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
558{
559 struct net *net = genl_info_net(info);
560
561 if (!info->attrs[SMC_PNETID_NAME])
562 return -EINVAL;
563 return smc_pnet_remove_by_pnetid(net,
564 (char *)nla_data(info->attrs[SMC_PNETID_NAME]));
565}
566
567static int smc_pnet_dump_start(struct netlink_callback *cb)
568{
569 cb->args[0] = 0;
570 return 0;
571}
572
573static int smc_pnet_dumpinfo(struct sk_buff *skb,
574 u32 portid, u32 seq, u32 flags,
575 struct smc_pnetentry *pnetelem)
576{
577 void *hdr;
578
579 hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
580 flags, SMC_PNETID_GET);
581 if (!hdr)
582 return -ENOMEM;
583 if (smc_pnet_set_nla(skb, pnetelem) < 0) {
584 genlmsg_cancel(skb, hdr);
585 return -EMSGSIZE;
586 }
587 genlmsg_end(skb, hdr);
588 return 0;
589}
590
591static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
592 u32 seq, u8 *pnetid, int start_idx)
593{
594 struct smc_pnettable *pnettable;
595 struct smc_pnetentry *pnetelem;
596 struct smc_net *sn;
597 int idx = 0;
598
599
600 sn = net_generic(net, smc_net_id);
601 pnettable = &sn->pnettable;
602
603
604 read_lock(&pnettable->lock);
605 list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
606 if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
607 continue;
608 if (idx++ < start_idx)
609 continue;
610
611 if (net != &init_net && pnetelem->type != SMC_PNET_ETH)
612 continue;
613 if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
614 pnetelem)) {
615 --idx;
616 break;
617 }
618 }
619 read_unlock(&pnettable->lock);
620 return idx;
621}
622
623static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
624{
625 struct net *net = sock_net(skb->sk);
626 int idx;
627
628 idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
629 cb->nlh->nlmsg_seq, NULL, cb->args[0]);
630
631 cb->args[0] = idx;
632 return skb->len;
633}
634
635
636static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
637{
638 struct net *net = genl_info_net(info);
639 struct sk_buff *msg;
640 void *hdr;
641
642 if (!info->attrs[SMC_PNETID_NAME])
643 return -EINVAL;
644
645 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
646 if (!msg)
647 return -ENOMEM;
648
649 _smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
650 nla_data(info->attrs[SMC_PNETID_NAME]), 0);
651
652
653 hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
654 NLM_F_MULTI);
655 if (!hdr) {
656 nlmsg_free(msg);
657 return -EMSGSIZE;
658 }
659 return genlmsg_reply(msg, info);
660}
661
662
663
664static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
665{
666 struct net *net = genl_info_net(info);
667
668 smc_pnet_remove_by_pnetid(net, NULL);
669 return 0;
670}
671
672
673static const struct genl_ops smc_pnet_ops[] = {
674 {
675 .cmd = SMC_PNETID_GET,
676 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
677
678 .doit = smc_pnet_get,
679 .dumpit = smc_pnet_dump,
680 .start = smc_pnet_dump_start
681 },
682 {
683 .cmd = SMC_PNETID_ADD,
684 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
685 .flags = GENL_ADMIN_PERM,
686 .doit = smc_pnet_add
687 },
688 {
689 .cmd = SMC_PNETID_DEL,
690 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
691 .flags = GENL_ADMIN_PERM,
692 .doit = smc_pnet_del
693 },
694 {
695 .cmd = SMC_PNETID_FLUSH,
696 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
697 .flags = GENL_ADMIN_PERM,
698 .doit = smc_pnet_flush
699 }
700};
701
702
703static struct genl_family smc_pnet_nl_family __ro_after_init = {
704 .hdrsize = 0,
705 .name = SMCR_GENL_FAMILY_NAME,
706 .version = SMCR_GENL_FAMILY_VERSION,
707 .maxattr = SMC_PNETID_MAX,
708 .policy = smc_pnet_policy,
709 .netnsok = true,
710 .module = THIS_MODULE,
711 .ops = smc_pnet_ops,
712 .n_ops = ARRAY_SIZE(smc_pnet_ops)
713};
714
715bool smc_pnet_is_ndev_pnetid(struct net *net, u8 *pnetid)
716{
717 struct smc_net *sn = net_generic(net, smc_net_id);
718 struct smc_pnetids_ndev_entry *pe;
719 bool rc = false;
720
721 read_lock(&sn->pnetids_ndev.lock);
722 list_for_each_entry(pe, &sn->pnetids_ndev.list, list) {
723 if (smc_pnet_match(pnetid, pe->pnetid)) {
724 rc = true;
725 goto unlock;
726 }
727 }
728
729unlock:
730 read_unlock(&sn->pnetids_ndev.lock);
731 return rc;
732}
733
734static int smc_pnet_add_pnetid(struct net *net, u8 *pnetid)
735{
736 struct smc_net *sn = net_generic(net, smc_net_id);
737 struct smc_pnetids_ndev_entry *pe, *pi;
738
739 pe = kzalloc(sizeof(*pe), GFP_KERNEL);
740 if (!pe)
741 return -ENOMEM;
742
743 write_lock(&sn->pnetids_ndev.lock);
744 list_for_each_entry(pi, &sn->pnetids_ndev.list, list) {
745 if (smc_pnet_match(pnetid, pe->pnetid)) {
746 refcount_inc(&pi->refcnt);
747 kfree(pe);
748 goto unlock;
749 }
750 }
751 refcount_set(&pe->refcnt, 1);
752 memcpy(pe->pnetid, pnetid, SMC_MAX_PNETID_LEN);
753 list_add_tail(&pe->list, &sn->pnetids_ndev.list);
754
755unlock:
756 write_unlock(&sn->pnetids_ndev.lock);
757 return 0;
758}
759
760static void smc_pnet_remove_pnetid(struct net *net, u8 *pnetid)
761{
762 struct smc_net *sn = net_generic(net, smc_net_id);
763 struct smc_pnetids_ndev_entry *pe, *pe2;
764
765 write_lock(&sn->pnetids_ndev.lock);
766 list_for_each_entry_safe(pe, pe2, &sn->pnetids_ndev.list, list) {
767 if (smc_pnet_match(pnetid, pe->pnetid)) {
768 if (refcount_dec_and_test(&pe->refcnt)) {
769 list_del(&pe->list);
770 kfree(pe);
771 }
772 break;
773 }
774 }
775 write_unlock(&sn->pnetids_ndev.lock);
776}
777
778static void smc_pnet_add_base_pnetid(struct net *net, struct net_device *dev,
779 u8 *ndev_pnetid)
780{
781 struct net_device *base_dev;
782
783 base_dev = __pnet_find_base_ndev(dev);
784 if (base_dev->flags & IFF_UP &&
785 !smc_pnetid_by_dev_port(base_dev->dev.parent, base_dev->dev_port,
786 ndev_pnetid)) {
787
788 smc_pnet_add_pnetid(net, ndev_pnetid);
789 }
790}
791
792
793static void smc_pnet_create_pnetids_list(struct net *net)
794{
795 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
796 struct net_device *dev;
797
798 rtnl_lock();
799 for_each_netdev(net, dev)
800 smc_pnet_add_base_pnetid(net, dev, ndev_pnetid);
801 rtnl_unlock();
802}
803
804
805static void smc_pnet_destroy_pnetids_list(struct net *net)
806{
807 struct smc_net *sn = net_generic(net, smc_net_id);
808 struct smc_pnetids_ndev_entry *pe, *temp_pe;
809
810 write_lock(&sn->pnetids_ndev.lock);
811 list_for_each_entry_safe(pe, temp_pe, &sn->pnetids_ndev.list, list) {
812 list_del(&pe->list);
813 kfree(pe);
814 }
815 write_unlock(&sn->pnetids_ndev.lock);
816}
817
818static int smc_pnet_netdev_event(struct notifier_block *this,
819 unsigned long event, void *ptr)
820{
821 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
822 struct net *net = dev_net(event_dev);
823 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
824
825 switch (event) {
826 case NETDEV_REBOOT:
827 case NETDEV_UNREGISTER:
828 smc_pnet_remove_by_ndev(event_dev);
829 smc_ib_ndev_change(event_dev, event);
830 return NOTIFY_OK;
831 case NETDEV_REGISTER:
832 smc_pnet_add_by_ndev(event_dev);
833 smc_ib_ndev_change(event_dev, event);
834 return NOTIFY_OK;
835 case NETDEV_UP:
836 smc_pnet_add_base_pnetid(net, event_dev, ndev_pnetid);
837 return NOTIFY_OK;
838 case NETDEV_DOWN:
839 event_dev = __pnet_find_base_ndev(event_dev);
840 if (!smc_pnetid_by_dev_port(event_dev->dev.parent,
841 event_dev->dev_port, ndev_pnetid)) {
842
843 smc_pnet_remove_pnetid(net, ndev_pnetid);
844 }
845 return NOTIFY_OK;
846 default:
847 return NOTIFY_DONE;
848 }
849}
850
851static struct notifier_block smc_netdev_notifier = {
852 .notifier_call = smc_pnet_netdev_event
853};
854
855
856int smc_pnet_net_init(struct net *net)
857{
858 struct smc_net *sn = net_generic(net, smc_net_id);
859 struct smc_pnettable *pnettable = &sn->pnettable;
860 struct smc_pnetids_ndev *pnetids_ndev = &sn->pnetids_ndev;
861
862 INIT_LIST_HEAD(&pnettable->pnetlist);
863 rwlock_init(&pnettable->lock);
864 INIT_LIST_HEAD(&pnetids_ndev->list);
865 rwlock_init(&pnetids_ndev->lock);
866
867 smc_pnet_create_pnetids_list(net);
868
869 return 0;
870}
871
872int __init smc_pnet_init(void)
873{
874 int rc;
875
876 rc = genl_register_family(&smc_pnet_nl_family);
877 if (rc)
878 return rc;
879 rc = register_netdevice_notifier(&smc_netdev_notifier);
880 if (rc)
881 genl_unregister_family(&smc_pnet_nl_family);
882
883 return rc;
884}
885
886
887void smc_pnet_net_exit(struct net *net)
888{
889
890 smc_pnet_remove_by_pnetid(net, NULL);
891 smc_pnet_destroy_pnetids_list(net);
892}
893
894void smc_pnet_exit(void)
895{
896 unregister_netdevice_notifier(&smc_netdev_notifier);
897 genl_unregister_family(&smc_pnet_nl_family);
898}
899
900static struct net_device *__pnet_find_base_ndev(struct net_device *ndev)
901{
902 int i, nest_lvl;
903
904 ASSERT_RTNL();
905 nest_lvl = ndev->lower_level;
906 for (i = 0; i < nest_lvl; i++) {
907 struct list_head *lower = &ndev->adj_list.lower;
908
909 if (list_empty(lower))
910 break;
911 lower = lower->next;
912 ndev = netdev_lower_get_next(ndev, &lower);
913 }
914 return ndev;
915}
916
917
918
919
920
921
922static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
923{
924 rtnl_lock();
925 ndev = __pnet_find_base_ndev(ndev);
926 rtnl_unlock();
927 return ndev;
928}
929
930static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
931 u8 *pnetid)
932{
933 struct smc_pnettable *pnettable;
934 struct net *net = dev_net(ndev);
935 struct smc_pnetentry *pnetelem;
936 struct smc_net *sn;
937 int rc = -ENOENT;
938
939
940 sn = net_generic(net, smc_net_id);
941 pnettable = &sn->pnettable;
942
943 read_lock(&pnettable->lock);
944 list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
945 if (pnetelem->type == SMC_PNET_ETH && ndev == pnetelem->ndev) {
946
947 memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
948 rc = 0;
949 break;
950 }
951 }
952 read_unlock(&pnettable->lock);
953 return rc;
954}
955
956
957static void _smc_pnet_find_roce_by_pnetid(u8 *pnet_id,
958 struct smc_init_info *ini,
959 struct smc_ib_device *known_dev)
960{
961 struct smc_ib_device *ibdev;
962 int i;
963
964 ini->ib_dev = NULL;
965 mutex_lock(&smc_ib_devices.mutex);
966 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
967 if (ibdev == known_dev)
968 continue;
969 for (i = 1; i <= SMC_MAX_PORTS; i++) {
970 if (!rdma_is_port_valid(ibdev->ibdev, i))
971 continue;
972 if (smc_pnet_match(ibdev->pnetid[i - 1], pnet_id) &&
973 smc_ib_port_active(ibdev, i) &&
974 !test_bit(i - 1, ibdev->ports_going_away) &&
975 !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
976 ini->ib_gid, NULL)) {
977 ini->ib_dev = ibdev;
978 ini->ib_port = i;
979 goto out;
980 }
981 }
982 }
983out:
984 mutex_unlock(&smc_ib_devices.mutex);
985}
986
987
988void smc_pnet_find_alt_roce(struct smc_link_group *lgr,
989 struct smc_init_info *ini,
990 struct smc_ib_device *known_dev)
991{
992 _smc_pnet_find_roce_by_pnetid(lgr->pnet_id, ini, known_dev);
993}
994
995
996
997
998static void smc_pnet_find_rdma_dev(struct net_device *netdev,
999 struct smc_init_info *ini)
1000{
1001 struct smc_ib_device *ibdev;
1002
1003 mutex_lock(&smc_ib_devices.mutex);
1004 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
1005 struct net_device *ndev;
1006 int i;
1007
1008 for (i = 1; i <= SMC_MAX_PORTS; i++) {
1009 if (!rdma_is_port_valid(ibdev->ibdev, i))
1010 continue;
1011 if (!ibdev->ibdev->ops.get_netdev)
1012 continue;
1013 ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
1014 if (!ndev)
1015 continue;
1016 dev_put(ndev);
1017 if (netdev == ndev &&
1018 smc_ib_port_active(ibdev, i) &&
1019 !test_bit(i - 1, ibdev->ports_going_away) &&
1020 !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
1021 ini->ib_gid, NULL)) {
1022 ini->ib_dev = ibdev;
1023 ini->ib_port = i;
1024 break;
1025 }
1026 }
1027 }
1028 mutex_unlock(&smc_ib_devices.mutex);
1029}
1030
1031
1032
1033
1034
1035
1036
1037static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
1038 struct smc_init_info *ini)
1039{
1040 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
1041
1042 ndev = pnet_find_base_ndev(ndev);
1043 if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
1044 ndev_pnetid) &&
1045 smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
1046 smc_pnet_find_rdma_dev(ndev, ini);
1047 return;
1048 }
1049 _smc_pnet_find_roce_by_pnetid(ndev_pnetid, ini, NULL);
1050}
1051
1052static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
1053 struct smc_init_info *ini)
1054{
1055 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
1056 struct smcd_dev *ismdev;
1057
1058 ndev = pnet_find_base_ndev(ndev);
1059 if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
1060 ndev_pnetid) &&
1061 smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
1062 return;
1063
1064 mutex_lock(&smcd_dev_list.mutex);
1065 list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
1066 if (smc_pnet_match(ismdev->pnetid, ndev_pnetid) &&
1067 !ismdev->going_away &&
1068 (!ini->ism_peer_gid[0] ||
1069 !smc_ism_cantalk(ini->ism_peer_gid[0], ini->vlan_id,
1070 ismdev))) {
1071 ini->ism_dev[0] = ismdev;
1072 break;
1073 }
1074 }
1075 mutex_unlock(&smcd_dev_list.mutex);
1076}
1077
1078
1079
1080
1081
1082void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
1083{
1084 struct dst_entry *dst = sk_dst_get(sk);
1085
1086 ini->ib_dev = NULL;
1087 ini->ib_port = 0;
1088 if (!dst)
1089 goto out;
1090 if (!dst->dev)
1091 goto out_rel;
1092
1093 smc_pnet_find_roce_by_pnetid(dst->dev, ini);
1094
1095out_rel:
1096 dst_release(dst);
1097out:
1098 return;
1099}
1100
1101void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
1102{
1103 struct dst_entry *dst = sk_dst_get(sk);
1104
1105 ini->ism_dev[0] = NULL;
1106 if (!dst)
1107 goto out;
1108 if (!dst->dev)
1109 goto out_rel;
1110
1111 smc_pnet_find_ism_by_pnetid(dst->dev, ini);
1112
1113out_rel:
1114 dst_release(dst);
1115out:
1116 return;
1117}
1118
1119
1120
1121int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port)
1122{
1123 char *ib_name = smcibdev->ibdev->name;
1124 struct smc_pnettable *pnettable;
1125 struct smc_pnetentry *tmp_pe;
1126 struct smc_net *sn;
1127 int rc = -ENOENT;
1128
1129
1130 sn = net_generic(&init_net, smc_net_id);
1131 pnettable = &sn->pnettable;
1132
1133 read_lock(&pnettable->lock);
1134 list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
1135 if (tmp_pe->type == SMC_PNET_IB &&
1136 !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX) &&
1137 tmp_pe->ib_port == ib_port) {
1138 smc_pnet_apply_ib(smcibdev, ib_port, tmp_pe->pnet_name);
1139 rc = 0;
1140 break;
1141 }
1142 }
1143 read_unlock(&pnettable->lock);
1144
1145 return rc;
1146}
1147
1148
1149
1150int smc_pnetid_by_table_smcd(struct smcd_dev *smcddev)
1151{
1152 const char *ib_name = dev_name(&smcddev->dev);
1153 struct smc_pnettable *pnettable;
1154 struct smc_pnetentry *tmp_pe;
1155 struct smc_net *sn;
1156 int rc = -ENOENT;
1157
1158
1159 sn = net_generic(&init_net, smc_net_id);
1160 pnettable = &sn->pnettable;
1161
1162 read_lock(&pnettable->lock);
1163 list_for_each_entry(tmp_pe, &pnettable->pnetlist, list) {
1164 if (tmp_pe->type == SMC_PNET_IB &&
1165 !strncmp(tmp_pe->ib_name, ib_name, IB_DEVICE_NAME_MAX)) {
1166 smc_pnet_apply_smcd(smcddev, tmp_pe->pnet_name);
1167 rc = 0;
1168 break;
1169 }
1170 }
1171 read_unlock(&pnettable->lock);
1172
1173 return rc;
1174}
1175
