summaryrefslogtreecommitdiff
path: root/net/smc/smc_pnet.c
blob: 2920b006f65c00f0f99a92e5625b895ad292fecd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
// SPDX-License-Identifier: GPL-2.0
/*
 *  Shared Memory Communications over RDMA (SMC-R) and RoCE
 *
 *  Generic netlink support functions to configure an SMC-R PNET table
 *
 *  Copyright IBM Corp. 2016
 *
 *  Author(s):  Thomas Richter <tmricht@linux.vnet.ibm.com>
 */

#include <linux/module.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <net/netlink.h>
#include <net/genetlink.h>

#include <uapi/linux/if.h>
#include <uapi/linux/smc.h>

#include <rdma/ib_verbs.h>

#include <net/netns/generic.h>
#include "smc_netns.h"

#include "smc_pnet.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_core.h"

#define SMC_ASCII_BLANK 32

static struct net_device *pnet_find_base_ndev(struct net_device *ndev);

static struct nla_policy smc_pnet_policy[SMC_PNETID_MAX + 1] = {
	[SMC_PNETID_NAME] = {
		.type = NLA_NUL_STRING,
		.len = SMC_MAX_PNETID_LEN
	},
	[SMC_PNETID_ETHNAME] = {
		.type = NLA_NUL_STRING,
		.len = IFNAMSIZ - 1
	},
	[SMC_PNETID_IBNAME] = {
		.type = NLA_NUL_STRING,
		.len = IB_DEVICE_NAME_MAX - 1
	},
	[SMC_PNETID_IBPORT] = { .type = NLA_U8 }
};

static struct genl_family smc_pnet_nl_family;

/**
 * struct smc_user_pnetentry - pnet identifier name entry for/from user
 * @list: List node.
 * @pnet_name: Pnet identifier name
 * @ndev: pointer to network device.
 * @smcibdev: Pointer to IB device.
 * @ib_port: Port of IB device.
 * @smcd_dev: Pointer to smcd device.
 */
struct smc_user_pnetentry {
	struct list_head list;
	char pnet_name[SMC_MAX_PNETID_LEN + 1];
	struct net_device *ndev;
	struct smc_ib_device *smcibdev;
	u8 ib_port;
	struct smcd_dev *smcd_dev;
};

/* pnet entry stored in pnet table */
struct smc_pnetentry {
	struct list_head list;
	char pnet_name[SMC_MAX_PNETID_LEN + 1];
	struct net_device *ndev;
};

/* Check if two given pnetids match */
static bool smc_pnet_match(u8 *pnetid1, u8 *pnetid2)
{
	int i;

	for (i = 0; i < SMC_MAX_PNETID_LEN; i++) {
		if ((pnetid1[i] == 0 || pnetid1[i] == SMC_ASCII_BLANK) &&
		    (pnetid2[i] == 0 || pnetid2[i] == SMC_ASCII_BLANK))
			break;
		if (pnetid1[i] != pnetid2[i])
			return false;
	}
	return true;
}

/* Remove a pnetid from the pnet table.
 */
static int smc_pnet_remove_by_pnetid(struct net *net, char *pnet_name)
{
	struct smc_pnetentry *pnetelem, *tmp_pe;
	struct smc_pnettable *pnettable;
	struct smc_ib_device *ibdev;
	struct smcd_dev *smcd_dev;
	struct smc_net *sn;
	int rc = -ENOENT;
	int ibport;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	/* remove netdevices */
	write_lock(&pnettable->lock);
	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist,
				 list) {
		if (!pnet_name ||
		    smc_pnet_match(pnetelem->pnet_name, pnet_name)) {
			list_del(&pnetelem->list);
			dev_put(pnetelem->ndev);
			kfree(pnetelem);
			rc = 0;
		}
	}
	write_unlock(&pnettable->lock);

	/* if this is not the initial namespace, stop here */
	if (net != &init_net)
		return rc;

	/* remove ib devices */
	spin_lock(&smc_ib_devices.lock);
	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
		for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
			if (ibdev->pnetid_by_user[ibport] &&
			    (!pnet_name ||
			     smc_pnet_match(pnet_name,
					    ibdev->pnetid[ibport]))) {
				memset(ibdev->pnetid[ibport], 0,
				       SMC_MAX_PNETID_LEN);
				ibdev->pnetid_by_user[ibport] = false;
				rc = 0;
			}
		}
	}
	spin_unlock(&smc_ib_devices.lock);
	/* remove smcd devices */
	spin_lock(&smcd_dev_list.lock);
	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
		if (smcd_dev->pnetid_by_user &&
		    (!pnet_name ||
		     smc_pnet_match(pnet_name, smcd_dev->pnetid))) {
			memset(smcd_dev->pnetid, 0, SMC_MAX_PNETID_LEN);
			smcd_dev->pnetid_by_user = false;
			rc = 0;
		}
	}
	spin_unlock(&smcd_dev_list.lock);
	return rc;
}

/* Remove a pnet entry mentioning a given network device from the pnet table.
 */
static int smc_pnet_remove_by_ndev(struct net_device *ndev)
{
	struct smc_pnetentry *pnetelem, *tmp_pe;
	struct smc_pnettable *pnettable;
	struct net *net = dev_net(ndev);
	struct smc_net *sn;
	int rc = -ENOENT;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	write_lock(&pnettable->lock);
	list_for_each_entry_safe(pnetelem, tmp_pe, &pnettable->pnetlist, list) {
		if (pnetelem->ndev == ndev) {
			list_del(&pnetelem->list);
			dev_put(pnetelem->ndev);
			kfree(pnetelem);
			rc = 0;
			break;
		}
	}
	write_unlock(&pnettable->lock);
	return rc;
}

/* Append a pnetid to the end of the pnet table if not already on this list.
 */
static int smc_pnet_enter(struct smc_pnettable *pnettable,
			  struct smc_user_pnetentry *new_pnetelem)
{
	u8 pnet_null[SMC_MAX_PNETID_LEN] = {0};
	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
	struct smc_pnetentry *tmp_pnetelem;
	struct smc_pnetentry *pnetelem;
	bool new_smcddev = false;
	struct net_device *ndev;
	bool new_netdev = true;
	bool new_ibdev = false;

	if (new_pnetelem->smcibdev) {
		struct smc_ib_device *ib_dev = new_pnetelem->smcibdev;
		int ib_port = new_pnetelem->ib_port;

		spin_lock(&smc_ib_devices.lock);
		if (smc_pnet_match(ib_dev->pnetid[ib_port - 1], pnet_null)) {
			memcpy(ib_dev->pnetid[ib_port - 1],
			       new_pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
			ib_dev->pnetid_by_user[ib_port - 1] = true;
			new_ibdev = true;
		}
		spin_unlock(&smc_ib_devices.lock);
	}
	if (new_pnetelem->smcd_dev) {
		struct smcd_dev *smcd_dev = new_pnetelem->smcd_dev;

		spin_lock(&smcd_dev_list.lock);
		if (smc_pnet_match(smcd_dev->pnetid, pnet_null)) {
			memcpy(smcd_dev->pnetid, new_pnetelem->pnet_name,
			       SMC_MAX_PNETID_LEN);
			smcd_dev->pnetid_by_user = true;
			new_smcddev = true;
		}
		spin_unlock(&smcd_dev_list.lock);
	}

	if (!new_pnetelem->ndev)
		return (new_ibdev || new_smcddev) ? 0 : -EEXIST;

	/* check if (base) netdev already has a pnetid. If there is one, we do
	 * not want to add a pnet table entry
	 */
	ndev = pnet_find_base_ndev(new_pnetelem->ndev);
	if (!smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
				    ndev_pnetid))
		return (new_ibdev || new_smcddev) ? 0 : -EEXIST;

	/* add a new netdev entry to the pnet table if there isn't one */
	tmp_pnetelem = kzalloc(sizeof(*pnetelem), GFP_KERNEL);
	if (!tmp_pnetelem)
		return -ENOMEM;
	memcpy(tmp_pnetelem->pnet_name, new_pnetelem->pnet_name,
	       SMC_MAX_PNETID_LEN);
	tmp_pnetelem->ndev = new_pnetelem->ndev;

	write_lock(&pnettable->lock);
	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
		if (pnetelem->ndev == new_pnetelem->ndev)
			new_netdev = false;
	}
	if (new_netdev) {
		dev_hold(tmp_pnetelem->ndev);
		list_add_tail(&tmp_pnetelem->list, &pnettable->pnetlist);
		write_unlock(&pnettable->lock);
	} else {
		write_unlock(&pnettable->lock);
		kfree(tmp_pnetelem);
	}

	return (new_netdev || new_ibdev || new_smcddev) ? 0 : -EEXIST;
}

/* The limit for pnetid is 16 characters.
 * Valid characters should be (single-byte character set) a-z, A-Z, 0-9.
 * Lower case letters are converted to upper case.
 * Interior blanks should not be used.
 */
static bool smc_pnetid_valid(const char *pnet_name, char *pnetid)
{
	char *bf = skip_spaces(pnet_name);
	size_t len = strlen(bf);
	char *end = bf + len;

	if (!len)
		return false;
	while (--end >= bf && isspace(*end))
		;
	if (end - bf >= SMC_MAX_PNETID_LEN)
		return false;
	while (bf <= end) {
		if (!isalnum(*bf))
			return false;
		*pnetid++ = islower(*bf) ? toupper(*bf) : *bf;
		bf++;
	}
	*pnetid = '\0';
	return true;
}

/* Find an infiniband device by a given name. The device might not exist. */
static struct smc_ib_device *smc_pnet_find_ib(char *ib_name)
{
	struct smc_ib_device *ibdev;

	spin_lock(&smc_ib_devices.lock);
	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
		if (!strncmp(ibdev->ibdev->name, ib_name,
			     sizeof(ibdev->ibdev->name)) ||
		    !strncmp(dev_name(ibdev->ibdev->dev.parent), ib_name,
			     IB_DEVICE_NAME_MAX - 1)) {
			goto out;
		}
	}
	ibdev = NULL;
out:
	spin_unlock(&smc_ib_devices.lock);
	return ibdev;
}

/* Find an smcd device by a given name. The device might not exist. */
static struct smcd_dev *smc_pnet_find_smcd(char *smcd_name)
{
	struct smcd_dev *smcd_dev;

	spin_lock(&smcd_dev_list.lock);
	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
		if (!strncmp(dev_name(&smcd_dev->dev), smcd_name,
			     IB_DEVICE_NAME_MAX - 1))
			goto out;
	}
	smcd_dev = NULL;
out:
	spin_unlock(&smcd_dev_list.lock);
	return smcd_dev;
}

/* Parse the supplied netlink attributes and fill a pnetentry structure.
 * For ethernet and infiniband device names verify that the devices exist.
 */
static int smc_pnet_fill_entry(struct net *net,
			       struct smc_user_pnetentry *pnetelem,
			       struct nlattr *tb[])
{
	char *string, *ibname;
	int rc;

	memset(pnetelem, 0, sizeof(*pnetelem));
	INIT_LIST_HEAD(&pnetelem->list);

	rc = -EINVAL;
	if (!tb[SMC_PNETID_NAME])
		goto error;
	string = (char *)nla_data(tb[SMC_PNETID_NAME]);
	if (!smc_pnetid_valid(string, pnetelem->pnet_name))
		goto error;

	rc = -EINVAL;
	if (tb[SMC_PNETID_ETHNAME]) {
		string = (char *)nla_data(tb[SMC_PNETID_ETHNAME]);
		pnetelem->ndev = dev_get_by_name(net, string);
		if (!pnetelem->ndev)
			goto error;
	}

	/* if this is not the initial namespace, stop here */
	if (net != &init_net)
		return 0;

	rc = -EINVAL;
	if (tb[SMC_PNETID_IBNAME]) {
		ibname = (char *)nla_data(tb[SMC_PNETID_IBNAME]);
		ibname = strim(ibname);
		pnetelem->smcibdev = smc_pnet_find_ib(ibname);
		pnetelem->smcd_dev = smc_pnet_find_smcd(ibname);
		if (!pnetelem->smcibdev && !pnetelem->smcd_dev)
			goto error;
		if (pnetelem->smcibdev) {
			if (!tb[SMC_PNETID_IBPORT])
				goto error;
			pnetelem->ib_port = nla_get_u8(tb[SMC_PNETID_IBPORT]);
			if (pnetelem->ib_port < 1 ||
			    pnetelem->ib_port > SMC_MAX_PORTS)
				goto error;
		}
	}

	return 0;

error:
	if (pnetelem->ndev)
		dev_put(pnetelem->ndev);
	return rc;
}

/* Convert an smc_pnetentry to a netlink attribute sequence */
static int smc_pnet_set_nla(struct sk_buff *msg,
			    struct smc_user_pnetentry *pnetelem)
{
	if (nla_put_string(msg, SMC_PNETID_NAME, pnetelem->pnet_name))
		return -1;
	if (pnetelem->ndev) {
		if (nla_put_string(msg, SMC_PNETID_ETHNAME,
				   pnetelem->ndev->name))
			return -1;
	} else {
		if (nla_put_string(msg, SMC_PNETID_ETHNAME, "n/a"))
			return -1;
	}
	if (pnetelem->smcibdev) {
		if (nla_put_string(msg, SMC_PNETID_IBNAME,
			dev_name(pnetelem->smcibdev->ibdev->dev.parent)) ||
		    nla_put_u8(msg, SMC_PNETID_IBPORT, pnetelem->ib_port))
			return -1;
	} else if (pnetelem->smcd_dev) {
		if (nla_put_string(msg, SMC_PNETID_IBNAME,
				   dev_name(&pnetelem->smcd_dev->dev)) ||
		    nla_put_u8(msg, SMC_PNETID_IBPORT, 1))
			return -1;
	} else {
		if (nla_put_string(msg, SMC_PNETID_IBNAME, "n/a") ||
		    nla_put_u8(msg, SMC_PNETID_IBPORT, 0xff))
			return -1;
	}

	return 0;
}

static int smc_pnet_add(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);
	struct smc_user_pnetentry pnetelem;
	struct smc_pnettable *pnettable;
	struct smc_net *sn;
	int rc;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	rc = smc_pnet_fill_entry(net, &pnetelem, info->attrs);
	if (!rc)
		rc = smc_pnet_enter(pnettable, &pnetelem);
	if (pnetelem.ndev)
		dev_put(pnetelem.ndev);
	return rc;
}

static int smc_pnet_del(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);

	if (!info->attrs[SMC_PNETID_NAME])
		return -EINVAL;
	return smc_pnet_remove_by_pnetid(net,
				(char *)nla_data(info->attrs[SMC_PNETID_NAME]));
}

static int smc_pnet_dump_start(struct netlink_callback *cb)
{
	cb->args[0] = 0;
	return 0;
}

static int smc_pnet_dumpinfo(struct sk_buff *skb,
			     u32 portid, u32 seq, u32 flags,
			     struct smc_user_pnetentry *pnetelem)
{
	void *hdr;

	hdr = genlmsg_put(skb, portid, seq, &smc_pnet_nl_family,
			  flags, SMC_PNETID_GET);
	if (!hdr)
		return -ENOMEM;
	if (smc_pnet_set_nla(skb, pnetelem) < 0) {
		genlmsg_cancel(skb, hdr);
		return -EMSGSIZE;
	}
	genlmsg_end(skb, hdr);
	return 0;
}

static int _smc_pnet_dump(struct net *net, struct sk_buff *skb, u32 portid,
			  u32 seq, u8 *pnetid, int start_idx)
{
	struct smc_user_pnetentry tmp_entry;
	struct smc_pnettable *pnettable;
	struct smc_pnetentry *pnetelem;
	struct smc_ib_device *ibdev;
	struct smcd_dev *smcd_dev;
	struct smc_net *sn;
	int idx = 0;
	int ibport;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	/* dump netdevices */
	read_lock(&pnettable->lock);
	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
		if (pnetid && !smc_pnet_match(pnetelem->pnet_name, pnetid))
			continue;
		if (idx++ < start_idx)
			continue;
		memset(&tmp_entry, 0, sizeof(tmp_entry));
		memcpy(&tmp_entry.pnet_name, pnetelem->pnet_name,
		       SMC_MAX_PNETID_LEN);
		tmp_entry.ndev = pnetelem->ndev;
		if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
				      &tmp_entry)) {
			--idx;
			break;
		}
	}
	read_unlock(&pnettable->lock);

	/* if this is not the initial namespace, stop here */
	if (net != &init_net)
		return idx;

	/* dump ib devices */
	spin_lock(&smc_ib_devices.lock);
	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
		for (ibport = 0; ibport < SMC_MAX_PORTS; ibport++) {
			if (ibdev->pnetid_by_user[ibport]) {
				if (pnetid &&
				    !smc_pnet_match(ibdev->pnetid[ibport],
						    pnetid))
					continue;
				if (idx++ < start_idx)
					continue;
				memset(&tmp_entry, 0, sizeof(tmp_entry));
				memcpy(&tmp_entry.pnet_name,
				       ibdev->pnetid[ibport],
				       SMC_MAX_PNETID_LEN);
				tmp_entry.smcibdev = ibdev;
				tmp_entry.ib_port = ibport + 1;
				if (smc_pnet_dumpinfo(skb, portid, seq,
						      NLM_F_MULTI,
						      &tmp_entry)) {
					--idx;
					break;
				}
			}
		}
	}
	spin_unlock(&smc_ib_devices.lock);

	/* dump smcd devices */
	spin_lock(&smcd_dev_list.lock);
	list_for_each_entry(smcd_dev, &smcd_dev_list.list, list) {
		if (smcd_dev->pnetid_by_user) {
			if (pnetid && !smc_pnet_match(smcd_dev->pnetid, pnetid))
				continue;
			if (idx++ < start_idx)
				continue;
			memset(&tmp_entry, 0, sizeof(tmp_entry));
			memcpy(&tmp_entry.pnet_name, smcd_dev->pnetid,
			       SMC_MAX_PNETID_LEN);
			tmp_entry.smcd_dev = smcd_dev;
			if (smc_pnet_dumpinfo(skb, portid, seq, NLM_F_MULTI,
					      &tmp_entry)) {
				--idx;
				break;
			}
		}
	}
	spin_unlock(&smcd_dev_list.lock);

	return idx;
}

static int smc_pnet_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	int idx;

	idx = _smc_pnet_dump(net, skb, NETLINK_CB(cb->skb).portid,
			     cb->nlh->nlmsg_seq, NULL, cb->args[0]);

	cb->args[0] = idx;
	return skb->len;
}

/* Retrieve one PNETID entry */
static int smc_pnet_get(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);
	struct sk_buff *msg;
	void *hdr;

	if (!info->attrs[SMC_PNETID_NAME])
		return -EINVAL;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	_smc_pnet_dump(net, msg, info->snd_portid, info->snd_seq,
		       nla_data(info->attrs[SMC_PNETID_NAME]), 0);

	/* finish multi part message and send it */
	hdr = nlmsg_put(msg, info->snd_portid, info->snd_seq, NLMSG_DONE, 0,
			NLM_F_MULTI);
	if (!hdr) {
		nlmsg_free(msg);
		return -EMSGSIZE;
	}
	return genlmsg_reply(msg, info);
}

/* Remove and delete all pnetids from pnet table.
 */
static int smc_pnet_flush(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);

	smc_pnet_remove_by_pnetid(net, NULL);
	return 0;
}

/* SMC_PNETID generic netlink operation definition */
static const struct genl_ops smc_pnet_ops[] = {
	{
		.cmd = SMC_PNETID_GET,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = GENL_ADMIN_PERM,
		.doit = smc_pnet_get,
		.dumpit = smc_pnet_dump,
		.start = smc_pnet_dump_start
	},
	{
		.cmd = SMC_PNETID_ADD,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = GENL_ADMIN_PERM,
		.doit = smc_pnet_add
	},
	{
		.cmd = SMC_PNETID_DEL,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = GENL_ADMIN_PERM,
		.doit = smc_pnet_del
	},
	{
		.cmd = SMC_PNETID_FLUSH,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = GENL_ADMIN_PERM,
		.doit = smc_pnet_flush
	}
};

/* SMC_PNETID family definition */
static struct genl_family smc_pnet_nl_family __ro_after_init = {
	.hdrsize = 0,
	.name = SMCR_GENL_FAMILY_NAME,
	.version = SMCR_GENL_FAMILY_VERSION,
	.maxattr = SMC_PNETID_MAX,
	.policy = smc_pnet_policy,
	.netnsok = true,
	.module = THIS_MODULE,
	.ops = smc_pnet_ops,
	.n_ops =  ARRAY_SIZE(smc_pnet_ops)
};

static int smc_pnet_netdev_event(struct notifier_block *this,
				 unsigned long event, void *ptr)
{
	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);

	switch (event) {
	case NETDEV_REBOOT:
	case NETDEV_UNREGISTER:
		smc_pnet_remove_by_ndev(event_dev);
		return NOTIFY_OK;
	default:
		return NOTIFY_DONE;
	}
}

static struct notifier_block smc_netdev_notifier = {
	.notifier_call = smc_pnet_netdev_event
};

/* init network namespace */
int smc_pnet_net_init(struct net *net)
{
	struct smc_net *sn = net_generic(net, smc_net_id);
	struct smc_pnettable *pnettable = &sn->pnettable;

	INIT_LIST_HEAD(&pnettable->pnetlist);
	rwlock_init(&pnettable->lock);

	return 0;
}

int __init smc_pnet_init(void)
{
	int rc;

	rc = genl_register_family(&smc_pnet_nl_family);
	if (rc)
		return rc;
	rc = register_netdevice_notifier(&smc_netdev_notifier);
	if (rc)
		genl_unregister_family(&smc_pnet_nl_family);
	return rc;
}

/* exit network namespace */
void smc_pnet_net_exit(struct net *net)
{
	/* flush pnet table */
	smc_pnet_remove_by_pnetid(net, NULL);
}

void smc_pnet_exit(void)
{
	unregister_netdevice_notifier(&smc_netdev_notifier);
	genl_unregister_family(&smc_pnet_nl_family);
}

/* Determine one base device for stacked net devices.
 * If the lower device level contains more than one devices
 * (for instance with bonding slaves), just the first device
 * is used to reach a base device.
 */
static struct net_device *pnet_find_base_ndev(struct net_device *ndev)
{
	int i, nest_lvl;

	rtnl_lock();
	nest_lvl = ndev->lower_level;
	for (i = 0; i < nest_lvl; i++) {
		struct list_head *lower = &ndev->adj_list.lower;

		if (list_empty(lower))
			break;
		lower = lower->next;
		ndev = netdev_lower_get_next(ndev, &lower);
	}
	rtnl_unlock();
	return ndev;
}

static int smc_pnet_find_ndev_pnetid_by_table(struct net_device *ndev,
					      u8 *pnetid)
{
	struct smc_pnettable *pnettable;
	struct net *net = dev_net(ndev);
	struct smc_pnetentry *pnetelem;
	struct smc_net *sn;
	int rc = -ENOENT;

	/* get pnettable for namespace */
	sn = net_generic(net, smc_net_id);
	pnettable = &sn->pnettable;

	read_lock(&pnettable->lock);
	list_for_each_entry(pnetelem, &pnettable->pnetlist, list) {
		if (ndev == pnetelem->ndev) {
			/* get pnetid of netdev device */
			memcpy(pnetid, pnetelem->pnet_name, SMC_MAX_PNETID_LEN);
			rc = 0;
			break;
		}
	}
	read_unlock(&pnettable->lock);
	return rc;
}

/* if handshake network device belongs to a roce device, return its
 * IB device and port
 */
static void smc_pnet_find_rdma_dev(struct net_device *netdev,
				   struct smc_init_info *ini)
{
	struct smc_ib_device *ibdev;

	spin_lock(&smc_ib_devices.lock);
	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
		struct net_device *ndev;
		int i;

		for (i = 1; i <= SMC_MAX_PORTS; i++) {
			if (!rdma_is_port_valid(ibdev->ibdev, i))
				continue;
			if (!ibdev->ibdev->ops.get_netdev)
				continue;
			ndev = ibdev->ibdev->ops.get_netdev(ibdev->ibdev, i);
			if (!ndev)
				continue;
			dev_put(ndev);
			if (netdev == ndev &&
			    smc_ib_port_active(ibdev, i) &&
			    !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
						  ini->ib_gid, NULL)) {
				ini->ib_dev = ibdev;
				ini->ib_port = i;
				break;
			}
		}
	}
	spin_unlock(&smc_ib_devices.lock);
}

/* Determine the corresponding IB device port based on the hardware PNETID.
 * Searching stops at the first matching active IB device port with vlan_id
 * configured.
 * If nothing found, check pnetid table.
 * If nothing found, try to use handshake device
 */
static void smc_pnet_find_roce_by_pnetid(struct net_device *ndev,
					 struct smc_init_info *ini)
{
	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
	struct smc_ib_device *ibdev;
	int i;

	ndev = pnet_find_base_ndev(ndev);
	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
				   ndev_pnetid) &&
	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid)) {
		smc_pnet_find_rdma_dev(ndev, ini);
		return; /* pnetid could not be determined */
	}

	spin_lock(&smc_ib_devices.lock);
	list_for_each_entry(ibdev, &smc_ib_devices.list, list) {
		for (i = 1; i <= SMC_MAX_PORTS; i++) {
			if (!rdma_is_port_valid(ibdev->ibdev, i))
				continue;
			if (smc_pnet_match(ibdev->pnetid[i - 1], ndev_pnetid) &&
			    smc_ib_port_active(ibdev, i) &&
			    !smc_ib_determine_gid(ibdev, i, ini->vlan_id,
						  ini->ib_gid, NULL)) {
				ini->ib_dev = ibdev;
				ini->ib_port = i;
				goto out;
			}
		}
	}
out:
	spin_unlock(&smc_ib_devices.lock);
}

static void smc_pnet_find_ism_by_pnetid(struct net_device *ndev,
					struct smc_init_info *ini)
{
	u8 ndev_pnetid[SMC_MAX_PNETID_LEN];
	struct smcd_dev *ismdev;

	ndev = pnet_find_base_ndev(ndev);
	if (smc_pnetid_by_dev_port(ndev->dev.parent, ndev->dev_port,
				   ndev_pnetid) &&
	    smc_pnet_find_ndev_pnetid_by_table(ndev, ndev_pnetid))
		return; /* pnetid could not be determined */

	spin_lock(&smcd_dev_list.lock);
	list_for_each_entry(ismdev, &smcd_dev_list.list, list) {
		if (smc_pnet_match(ismdev->pnetid, ndev_pnetid)) {
			ini->ism_dev = ismdev;
			break;
		}
	}
	spin_unlock(&smcd_dev_list.lock);
}

/* PNET table analysis for a given sock:
 * determine ib_device and port belonging to used internal TCP socket
 * ethernet interface.
 */
void smc_pnet_find_roce_resource(struct sock *sk, struct smc_init_info *ini)
{
	struct dst_entry *dst = sk_dst_get(sk);

	ini->ib_dev = NULL;
	ini->ib_port = 0;
	if (!dst)
		goto out;
	if (!dst->dev)
		goto out_rel;

	smc_pnet_find_roce_by_pnetid(dst->dev, ini);

out_rel:
	dst_release(dst);
out:
	return;
}

void smc_pnet_find_ism_resource(struct sock *sk, struct smc_init_info *ini)
{
	struct dst_entry *dst = sk_dst_get(sk);

	ini->ism_dev = NULL;
	if (!dst)
		goto out;
	if (!dst->dev)
		goto out_rel;

	smc_pnet_find_ism_by_pnetid(dst->dev, ini);

out_rel:
	dst_release(dst);
out:
	return;
}