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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * Generic netlink support functions to configure an SMC-R PNET table
6 *
7 * Copyright IBM Corp. 2016
8 *
9 * Author(s): Thomas Richter <tmricht@linux.vnet.ibm.com>
10 */
11
12#include <linux/module.h>
13#include <linux/list.h>
14#include <linux/ctype.h>
15#include <net/netlink.h>
16#include <net/genetlink.h>
17
18#include <uapi/linux/if.h>
19#include <uapi/linux/smc.h>
20
21#include <rdma/ib_verbs.h>
22
23#include <net/netns/generic.h>
24#include "smc_netns.h"
25
26#include "smc_pnet.h"
27#include "smc_ib.h"
28#include "smc_ism.h"
29#include "smc_core.h"
30
31#define SMC_ASCII_BLANK 32
32
33static struct net_device *pnet_find_base_ndev(struct net_device *ndev);
34
35static 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
53/**
54 * struct smc_user_pnetentry - pnet identifier name entry for/from user
55 * @list: List node.
56 * @pnet_name: Pnet identifier name
57 * @ndev: pointer to network device.
58 * @smcibdev: Pointer to IB device.
59 * @ib_port: Port of IB device.
60 * @smcd_dev: Pointer to smcd device.
61 */
62struct smc_user_pnetentry {
63 struct list_head list;
64 char pnet_name[SMC_MAX_PNETID_LEN + 1];
65 struct net_device *ndev;
66 struct smc_ib_device *smcibdev;
67 u8 ib_port;
68 struct smcd_dev *smcd_dev;
69};
70
71/* pnet entry stored in pnet table */
72struct smc_pnetentry {
73 struct list_head list;
74 char pnet_name[SMC_MAX_PNETID_LEN + 1];
75 struct net_device *ndev;
76};
77
78/* Check if two given pnetids match */
79static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
80{
81 int i;
82
83 for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
84 if ((pnetid1[i] == 0 || pnetid1[i] == SMC_ASCII_BLANK) &&
85 (pnetid2[i] == 0 || pnetid2[i] == SMC_ASCII_BLANK))
86 break;
87 if (pnetid1[i] != pnetid2[i])
88 return false;
89 }
90 return true;
91}
92
93/* Remove a pnetid from the pnet table.
94 */
95static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
96{
97 struct smc_pnetentry *pnetelem, *tmp_pe;
98 struct smc_pnettable *pnettable;
99 struct smc_ib_device *ibdev;
100 struct smcd_dev *smcd_dev;
101 struct smc_net *sn;
102 int rc = -ENOENT;
103 int ibport;
104
105 /* get pnettable for namespace */
106 sn = net_generic(net, smc_net_id);
107 pnettable = &sn->pnettable;
108
109 /* remove netdevices */
110 write_lock(&pnettable->lock);
111 list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
112 list) {
113 if (!pnet_name ||
114 smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
115 list_del(&pnetelem->list);
116 dev_put(pnetelem->ndev);
117 kfree(pnetelem);
118 rc = 0;
119 }
120 }
121 write_unlock(&pnettable->lock);
122
123 /* if this is not the initial namespace, stop here */
124 if (net != &init_net)
125 return rc;
126
127 /* remove ib devices */
128 spin_lock(&smc_ib_devices.lock);
129 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
130 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
131 if (ibdev->pnetid_by_user[ibport] &&
132 (!pnet_name ||
133 smc_pnet_match(pnet_name,
134 ibdev->pnetid[ibport]))) {
135 memset(ibdev->pnetid[ibport], 0,
136 SMC_MAX_PNETID_LEN);
137 ibdev->pnetid_by_user[ibport] = false;
138 rc = 0;
139 }
140 }
141 }
142 spin_unlock(&smc_ib_devices.lock);
143 /* remove smcd devices */
144 spin_lock(&smcd_dev_list.lock);
145 list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
146 if (smcd_dev->pnetid_by_user &&
147 (!pnet_name ||
148 smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
149 memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
150 smcd_dev->pnetid_by_user = false;
151 rc = 0;
152 }
153 }
154 spin_unlock(&smcd_dev_list.lock);
155 return rc;
156}
157
158/* Remove a pnet entry mentioning a given network device from the pnet table.
159 */
160static int smc_pnet_remove_by_ndev(struct net_device *ndev)
161{
162 struct smc_pnetentry *pnetelem, *tmp_pe;
163 struct smc_pnettable *pnettable;
164 struct net *net = dev_net(ndev);
165 struct smc_net *sn;
166 int rc = -ENOENT;
167
168 /* get pnettable for namespace */
169 sn = net_generic(net, smc_net_id);
170 pnettable = &sn->pnettable;
171
172 write_lock(&pnettable->lock);
173 list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
174 if (pnetelem->ndev == ndev) {
175 list_del(&pnetelem->list);
176 dev_put(pnetelem->ndev);
177 kfree(pnetelem);
178 rc = 0;
179 break;
180 }
181 }
182 write_unlock(&pnettable->lock);
183 return rc;
184}
185
186/* Append a pnetid to the end of the pnet table if not already on this list.
187 */
188static int smc_pnet_enter(struct smc_pnettable *pnettable,
189 struct smc_user_pnetentry *new_pnetelem)
190{
191 u8 pnet_null[SMC_MAX_PNETID_LEN] = {0};
192 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
193 struct smc_pnetentry *tmp_pnetelem;
194 struct smc_pnetentry *pnetelem;
195 bool new_smcddev = false;
196 struct net_device *ndev;
197 bool new_netdev = true;
198 bool new_ibdev = false;
199
200 if (new_pnetelem->smcibdev) {
201 struct smc_ib_device *ib_dev = new_pnetelem->smcibdev;
202 int ib_port = new_pnetelem->ib_port;
203
204 spin_lock(&smc_ib_devices.lock);
205 if (smc_pnet_match(ib_dev->pnetid[ib_port - 1], pnet_null)) {
206 memcpy(ib_dev->pnetid[ib_port - 1],
207 new_pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
208 ib_dev->pnetid_by_user[ib_port - 1] = true;
209 new_ibdev = true;
210 }
211 spin_unlock(&smc_ib_devices.lock);
212 }
213 if (new_pnetelem->smcd_dev) {
214 struct smcd_dev *smcd_dev = new_pnetelem->smcd_dev;
215
216 spin_lock(&smcd_dev_list.lock);
217 if (smc_pnet_match(smcd_dev->pnetid, pnet_null)) {
218 memcpy(smcd_dev->pnetid, new_pnetelem->pnet_name,
219 SMC_MAX_PNETID_LEN);
220 smcd_dev->pnetid_by_user = true;
221 new_smcddev = true;
222 }
223 spin_unlock(&smcd_dev_list.lock);
224 }
225
226 if (!new_pnetelem->ndev)
227 return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
228
229 /* check if (base) netdev already has a pnetid. If there is one, we do
230 * not want to add a pnet table entry
231 */
232 ndev = pnet_find_base_ndev(new_pnetelem->ndev);
233 if (!smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
234 ndev_pnetid))
235 return (new_ibdev || new_smcddev) ? 0 : -EEXIST;
236
237 /* add a new netdev entry to the pnet table if there isn't one */
238 tmp_pnetelem = kzalloc(sizeof(*pnetelem), GFP_KERNEL);
239 if (!tmp_pnetelem)
240 return -ENOMEM;
241 memcpy(tmp_pnetelem->pnet_name, new_pnetelem->pnet_name,
242 SMC_MAX_PNETID_LEN);
243 tmp_pnetelem->ndev = new_pnetelem->ndev;
244
245 write_lock(&pnettable->lock);
246 list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
247 if (pnetelem->ndev == new_pnetelem->ndev)
248 new_netdev = false;
249 }
250 if (new_netdev) {
251 dev_hold(tmp_pnetelem->ndev);
252 list_add_tail(&tmp_pnetelem->list, &pnettable->pnetlist);
253 write_unlock(&pnettable->lock);
254 } else {
255 write_unlock(&pnettable->lock);
256 kfree(tmp_pnetelem);
257 }
258
259 return (new_netdev || new_ibdev || new_smcddev) ? 0 : -EEXIST;
260}
261
262/* The limit for pnetid is 16 characters.
263 * Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
264 * Lower case letters are converted to upper case.
265 * Interior blanks should not be used.
266 */
267static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
268{
269 char *bf = skip_spaces(pnet_name);
270 size_t len = strlen(bf);
271 char *end = bf + len;
272
273 if (!len)
274 return false;
275 while (--end >= bf && isspace(*end))
276 ;
277 if (end - bf >= SMC_MAX_PNETID_LEN)
278 return false;
279 while (bf <= end) {
280 if (!isalnum(*bf))
281 return false;
282 *pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
283 bf++;
284 }
285 *pnetid = '\0';
286 return true;
287}
288
289/* Find an infiniband device by a given name. The device might not exist. */
290static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
291{
292 struct smc_ib_device *ibdev;
293
294 spin_lock(&smc_ib_devices.lock);
295 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
296 if (!strncmp(ibdev->ibdev->name, ib_name,
297 sizeof(ibdev->ibdev->name)) ||
298 !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
299 IB_DEVICE_NAME_MAX - 1)) {
300 goto out;
301 }
302 }
303 ibdev = NULL;
304out:
305 spin_unlock(&smc_ib_devices.lock);
306 return ibdev;
307}
308
309/* Find an smcd device by a given name. The device might not exist. */
310static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
311{
312 struct smcd_dev *smcd_dev;
313
314 spin_lock(&smcd_dev_list.lock);
315 list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
316 if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
317 IB_DEVICE_NAME_MAX - 1))
318 goto out;
319 }
320 smcd_dev = NULL;
321out:
322 spin_unlock(&smcd_dev_list.lock);
323 return smcd_dev;
324}
325
326/* Parse the supplied netlink attributes and fill a pnetentry structure.
327 * For ethernet and infiniband device names verify that the devices exist.
328 */
329static int smc_pnet_fill_entry(struct net *net,
330 struct smc_user_pnetentry *pnetelem,
331 struct nlattr *tb[])
332{
333 char *string, *ibname;
334 int rc;
335
336 memset(pnetelem, 0, sizeof(*pnetelem));
337 INIT_LIST_HEAD(&pnetelem->list);
338
339 rc = -EINVAL;
340 if (!tb[SMC_PNETID_NAME])
341 goto error;
342 string = (char *)nla_data(tb[SMC_PNETID_NAME]);
343 if (!smc_pnetid_valid(string, pnetelem->pnet_name))
344 goto error;
345
346 rc = -EINVAL;
347 if (tb[SMC_PNETID_ETHNAME]) {
348 string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
349 pnetelem->ndev = dev_get_by_name(net, string);
350 if (!pnetelem->ndev)
351 goto error;
352 }
353
354 /* if this is not the initial namespace, stop here */
355 if (net != &init_net)
356 return 0;
357
358 rc = -EINVAL;
359 if (tb[SMC_PNETID_IBNAME]) {
360 ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
361 ibname = strim(ibname);
362 pnetelem->smcibdev = smc_pnet_find_ib(ibname);
363 pnetelem->smcd_dev = smc_pnet_find_smcd(ibname);
364 if (!pnetelem->smcibdev && !pnetelem->smcd_dev)
365 goto error;
366 if (pnetelem->smcibdev) {
367 if (!tb[SMC_PNETID_IBPORT])
368 goto error;
369 pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
370 if (pnetelem->ib_port < 1 ||
371 pnetelem->ib_port > SMC_MAX_PORTS)
372 goto error;
373 }
374 }
375
376 return 0;
377
378error:
379 return rc;
380}
381
382/* Convert an smc_pnetentry to a netlink attribute sequence */
383static int smc_pnet_set_nla(struct sk_buff *msg,
384 struct smc_user_pnetentry *pnetelem)
385{
386 if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
387 return -1;
388 if (pnetelem->ndev) {
389 if (nla_put_string(msg, SMC_PNETID_ETHNAME,
390 pnetelem->ndev->name))
391 return -1;
392 } else {
393 if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
394 return -1;
395 }
396 if (pnetelem->smcibdev) {
397 if (nla_put_string(msg, SMC_PNETID_IBNAME,
398 dev_name(pnetelem->smcibdev->ibdev->dev.parent)) ||
399 nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
400 return -1;
401 } else if (pnetelem->smcd_dev) {
402 if (nla_put_string(msg, SMC_PNETID_IBNAME,
403 dev_name(&pnetelem->smcd_dev->dev)) ||
404 nla_put_u8(msg, SMC_PNETID_IBPORT, 1))
405 return -1;
406 } else {
407 if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
408 nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
409 return -1;
410 }
411
412 return 0;
413}
414
415static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
416{
417 struct net *net = genl_info_net(info);
418 struct smc_user_pnetentry pnetelem;
419 struct smc_pnettable *pnettable;
420 struct smc_net *sn;
421 int rc;
422
423 /* get pnettable for namespace */
424 sn = net_generic(net, smc_net_id);
425 pnettable = &sn->pnettable;
426
427 rc = smc_pnet_fill_entry(net, &pnetelem, info->attrs);
428 if (!rc)
429 rc = smc_pnet_enter(pnettable, &pnetelem);
430 if (pnetelem.ndev)
431 dev_put(pnetelem.ndev);
432 return rc;
433}
434
435static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
436{
437 struct net *net = genl_info_net(info);
438
439 if (!info->attrs[SMC_PNETID_NAME])
440 return -EINVAL;
441 return smc_pnet_remove_by_pnetid(net,
442 (char *)nla_data(info->attrs[SMC_PNETID_NAME]));
443}
444
445static int smc_pnet_dump_start(struct netlink_callback *cb)
446{
447 cb->args[0] = 0;
448 return 0;
449}
450
451static int smc_pnet_dumpinfo(struct sk_buff *skb,
452 u32 portid, u32 seq, u32 flags,
453 struct smc_user_pnetentry *pnetelem)
454{
455 void *hdr;
456
457 hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
458 flags, SMC_PNETID_GET);
459 if (!hdr)
460 return -ENOMEM;
461 if (smc_pnet_set_nla(skb, pnetelem) < 0) {
462 genlmsg_cancel(skb, hdr);
463 return -EMSGSIZE;
464 }
465 genlmsg_end(skb, hdr);
466 return 0;
467}
468
469static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
470 u32 seq, u8 *pnetid, int start_idx)
471{
472 struct smc_user_pnetentry tmp_entry;
473 struct smc_pnettable *pnettable;
474 struct smc_pnetentry *pnetelem;
475 struct smc_ib_device *ibdev;
476 struct smcd_dev *smcd_dev;
477 struct smc_net *sn;
478 int idx = 0;
479 int ibport;
480
481 /* get pnettable for namespace */
482 sn = net_generic(net, smc_net_id);
483 pnettable = &sn->pnettable;
484
485 /* dump netdevices */
486 read_lock(&pnettable->lock);
487 list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
488 if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
489 continue;
490 if (idx++ < start_idx)
491 continue;
492 memset(&tmp_entry, 0, sizeof(tmp_entry));
493 memcpy(&tmp_entry.pnet_name, pnetelem->pnet_name,
494 SMC_MAX_PNETID_LEN);
495 tmp_entry.ndev = pnetelem->ndev;
496 if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
497 &tmp_entry)) {
498 --idx;
499 break;
500 }
501 }
502 read_unlock(&pnettable->lock);
503
504 /* if this is not the initial namespace, stop here */
505 if (net != &init_net)
506 return idx;
507
508 /* dump ib devices */
509 spin_lock(&smc_ib_devices.lock);
510 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
511 for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
512 if (ibdev->pnetid_by_user[ibport]) {
513 if (pnetid &&
514 !smc_pnet_match(ibdev->pnetid[ibport],
515 pnetid))
516 continue;
517 if (idx++ < start_idx)
518 continue;
519 memset(&tmp_entry, 0, sizeof(tmp_entry));
520 memcpy(&tmp_entry.pnet_name,
521 ibdev->pnetid[ibport],
522 SMC_MAX_PNETID_LEN);
523 tmp_entry.smcibdev = ibdev;
524 tmp_entry.ib_port = ibport + 1;
525 if (smc_pnet_dumpinfo(skb, portid, seq,
526 NLM_F_MULTI,
527 &tmp_entry)) {
528 --idx;
529 break;
530 }
531 }
532 }
533 }
534 spin_unlock(&smc_ib_devices.lock);
535
536 /* dump smcd devices */
537 spin_lock(&smcd_dev_list.lock);
538 list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
539 if (smcd_dev->pnetid_by_user) {
540 if (pnetid && !smc_pnet_match(smcd_dev->pnetid, pnetid))
541 continue;
542 if (idx++ < start_idx)
543 continue;
544 memset(&tmp_entry, 0, sizeof(tmp_entry));
545 memcpy(&tmp_entry.pnet_name, smcd_dev->pnetid,
546 SMC_MAX_PNETID_LEN);
547 tmp_entry.smcd_dev = smcd_dev;
548 if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
549 &tmp_entry)) {
550 --idx;
551 break;
552 }
553 }
554 }
555 spin_unlock(&smcd_dev_list.lock);
556
557 return idx;
558}
559
560static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
561{
562 struct net *net = sock_net(skb->sk);
563 int idx;
564
565 idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
566 cb->nlh->nlmsg_seq, NULL, cb->args[0]);
567
568 cb->args[0] = idx;
569 return skb->len;
570}
571
572/* Retrieve one PNETID entry */
573static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
574{
575 struct net *net = genl_info_net(info);
576 struct sk_buff *msg;
577 void *hdr;
578
579 if (!info->attrs[SMC_PNETID_NAME])
580 return -EINVAL;
581
582 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
583 if (!msg)
584 return -ENOMEM;
585
586 _smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
587 nla_data(info->attrs[SMC_PNETID_NAME]), 0);
588
589 /* finish multi part message and send it */
590 hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
591 NLM_F_MULTI);
592 if (!hdr) {
593 nlmsg_free(msg);
594 return -EMSGSIZE;
595 }
596 return genlmsg_reply(msg, info);
597}
598
599/* Remove and delete all pnetids from pnet table.
600 */
601static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
602{
603 struct net *net = genl_info_net(info);
604
605 smc_pnet_remove_by_pnetid(net, NULL);
606 return 0;
607}
608
609/* SMC_PNETID generic netlink operation definition */
610static const struct genl_ops smc_pnet_ops[] = {
611 {
612 .cmd = SMC_PNETID_GET,
613 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
614 .flags = GENL_ADMIN_PERM,
615 .doit = smc_pnet_get,
616 .dumpit = smc_pnet_dump,
617 .start = smc_pnet_dump_start
618 },
619 {
620 .cmd = SMC_PNETID_ADD,
621 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
622 .flags = GENL_ADMIN_PERM,
623 .doit = smc_pnet_add
624 },
625 {
626 .cmd = SMC_PNETID_DEL,
627 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
628 .flags = GENL_ADMIN_PERM,
629 .doit = smc_pnet_del
630 },
631 {
632 .cmd = SMC_PNETID_FLUSH,
633 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
634 .flags = GENL_ADMIN_PERM,
635 .doit = smc_pnet_flush
636 }
637};
638
639/* SMC_PNETID family definition */
640static struct genl_family smc_pnet_nl_family __ro_after_init = {
641 .hdrsize = 0,
642 .name = SMCR_GENL_FAMILY_NAME,
643 .version = SMCR_GENL_FAMILY_VERSION,
644 .maxattr = SMC_PNETID_MAX,
645 .policy = smc_pnet_policy,
646 .netnsok = true,
647 .module = THIS_MODULE,
648 .ops = smc_pnet_ops,
649 .n_ops = ARRAY_SIZE(smc_pnet_ops)
650};
651
652static int smc_pnet_netdev_event(struct notifier_block *this,
653 unsigned long event, void *ptr)
654{
655 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
656
657 switch (event) {
658 case NETDEV_REBOOT:
659 case NETDEV_UNREGISTER:
660 smc_pnet_remove_by_ndev(event_dev);
661 return NOTIFY_OK;
662 default:
663 return NOTIFY_DONE;
664 }
665}
666
667static struct notifier_block smc_netdev_notifier = {
668 .notifier_call = smc_pnet_netdev_event
669};
670
671/* init network namespace */
672int smc_pnet_net_init(struct net *net)
673{
674 struct smc_net *sn = net_generic(net, smc_net_id);
675 struct smc_pnettable *pnettable = &sn->pnettable;
676
677 INIT_LIST_HEAD(&pnettable->pnetlist);
678 rwlock_init(&pnettable->lock);
679
680 return 0;
681}
682
683int __init smc_pnet_init(void)
684{
685 int rc;
686
687 rc = genl_register_family(&smc_pnet_nl_family);
688 if (rc)
689 return rc;
690 rc = register_netdevice_notifier(&smc_netdev_notifier);
691 if (rc)
692 genl_unregister_family(&smc_pnet_nl_family);
693 return rc;
694}
695
696/* exit network namespace */
697void smc_pnet_net_exit(struct net *net)
698{
699 /* flush pnet table */
700 smc_pnet_remove_by_pnetid(net, NULL);
701}
702
703void smc_pnet_exit(void)
704{
705 unregister_netdevice_notifier(&smc_netdev_notifier);
706 genl_unregister_family(&smc_pnet_nl_family);
707}
708
709/* Determine one base device for stacked net devices.
710 * If the lower device level contains more than one devices
711 * (for instance with bonding slaves), just the first device
712 * is used to reach a base device.
713 */
714static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
715{
716 int i, nest_lvl;
717
718 rtnl_lock();
719 nest_lvl = ndev->lower_level;
720 for (i = 0; i < nest_lvl; i++) {
721 struct list_head *lower = &ndev->adj_list.lower;
722
723 if (list_empty(lower))
724 break;
725 lower = lower->next;
726 ndev = netdev_lower_get_next(ndev, &lower);
727 }
728 rtnl_unlock();
729 return ndev;
730}
731
732static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
733 u8 *pnetid)
734{
735 struct smc_pnettable *pnettable;
736 struct net *net = dev_net(ndev);
737 struct smc_pnetentry *pnetelem;
738 struct smc_net *sn;
739 int rc = -ENOENT;
740
741 /* get pnettable for namespace */
742 sn = net_generic(net, smc_net_id);
743 pnettable = &sn->pnettable;
744
745 read_lock(&pnettable->lock);
746 list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
747 if (ndev == pnetelem->ndev) {
748 /* get pnetid of netdev device */
749 memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
750 rc = 0;
751 break;
752 }
753 }
754 read_unlock(&pnettable->lock);
755 return rc;
756}
757
758/* if handshake network device belongs to a roce device, return its
759 * IB device and port
760 */
761static void smc_pnet_find_rdma_dev(struct net_device *netdev,
762 struct smc_init_info *ini)
763{
764 struct smc_ib_device *ibdev;
765
766 spin_lock(&smc_ib_devices.lock);
767 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
768 struct net_device *ndev;
769 int i;
770
771 for (i = 1; i <= SMC_MAX_PORTS; i++) {
772 if (!rdma_is_port_valid(ibdev->ibdev, i))
773 continue;
774 if (!ibdev->ibdev->ops.get_netdev)
775 continue;
776 ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
777 if (!ndev)
778 continue;
779 dev_put(ndev);
780 if (netdev == ndev &&
781 smc_ib_port_active(ibdev, i) &&
782 !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
783 ini->ib_gid, NULL)) {
784 ini->ib_dev = ibdev;
785 ini->ib_port = i;
786 break;
787 }
788 }
789 }
790 spin_unlock(&smc_ib_devices.lock);
791}
792
793/* Determine the corresponding IB device port based on the hardware PNETID.
794 * Searching stops at the first matching active IB device port with vlan_id
795 * configured.
796 * If nothing found, check pnetid table.
797 * If nothing found, try to use handshake device
798 */
799static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
800 struct smc_init_info *ini)
801{
802 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
803 struct smc_ib_device *ibdev;
804 int i;
805
806 ndev = pnet_find_base_ndev(ndev);
807 if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
808 ndev_pnetid) &&
809 smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
810 smc_pnet_find_rdma_dev(ndev, ini);
811 return; /* pnetid could not be determined */
812 }
813
814 spin_lock(&smc_ib_devices.lock);
815 list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
816 for (i = 1; i <= SMC_MAX_PORTS; i++) {
817 if (!rdma_is_port_valid(ibdev->ibdev, i))
818 continue;
819 if (smc_pnet_match(ibdev->pnetid[i - 1], ndev_pnetid) &&
820 smc_ib_port_active(ibdev, i) &&
821 !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
822 ini->ib_gid, NULL)) {
823 ini->ib_dev = ibdev;
824 ini->ib_port = i;
825 goto out;
826 }
827 }
828 }
829out:
830 spin_unlock(&smc_ib_devices.lock);
831}
832
833static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
834 struct smc_init_info *ini)
835{
836 u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
837 struct smcd_dev *ismdev;
838
839 ndev = pnet_find_base_ndev(ndev);
840 if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
841 ndev_pnetid) &&
842 smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
843 return; /* pnetid could not be determined */
844
845 spin_lock(&smcd_dev_list.lock);
846 list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
847 if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
848 ini->ism_dev = ismdev;
849 break;
850 }
851 }
852 spin_unlock(&smcd_dev_list.lock);
853}
854
855/* PNET table analysis for a given sock:
856 * determine ib_device and port belonging to used internal TCP socket
857 * ethernet interface.
858 */
859void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
860{
861 struct dst_entry *dst = sk_dst_get(sk);
862
863 ini->ib_dev = NULL;
864 ini->ib_port = 0;
865 if (!dst)
866 goto out;
867 if (!dst->dev)
868 goto out_rel;
869
870 smc_pnet_find_roce_by_pnetid(dst->dev, ini);
871
872out_rel:
873 dst_release(dst);
874out:
875 return;
876}
877
878void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
879{
880 struct dst_entry *dst = sk_dst_get(sk);
881
882 ini->ism_dev = NULL;
883 if (!dst)
884 goto out;
885 if (!dst->dev)
886 goto out_rel;
887
888 smc_pnet_find_ism_by_pnetid(dst->dev, ini);
889
890out_rel:
891 dst_release(dst);
892out:
893 return;
894}