summaryrefslogtreecommitdiffstats
path: root/drivers/staging/ozwpan/ozproto.c
blob: 5d965cf06d59c60c717e5b9b87b74605f720ec5c (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
/* -----------------------------------------------------------------------------
 * Copyright (c) 2011 Ozmo Inc
 * Released under the GNU General Public License Version 2 (GPLv2).
 * -----------------------------------------------------------------------------
 */

#include <linux/module.h>
#include <linux/timer.h>
#include <linux/sched.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/errno.h>
#include <linux/ieee80211.h>
#include "ozdbg.h"
#include "ozprotocol.h"
#include "ozeltbuf.h"
#include "ozpd.h"
#include "ozproto.h"
#include "ozusbsvc.h"

#include "ozappif.h"
#include <asm/unaligned.h>
#include <linux/uaccess.h>
#include <net/psnap.h>

#define OZ_CF_CONN_SUCCESS	1
#define OZ_CF_CONN_FAILURE	2

#define OZ_DO_STOP		1
#define OZ_DO_SLEEP		2

#define OZ_MAX_TIMER_POOL_SIZE	16

struct oz_binding {
	struct packet_type ptype;
	char name[OZ_MAX_BINDING_LEN];
	struct list_head link;
};

/*
 * Static external variables.
 */
static DEFINE_SPINLOCK(g_polling_lock);
static LIST_HEAD(g_pd_list);
static LIST_HEAD(g_binding);
static DEFINE_SPINLOCK(g_binding_lock);
static struct sk_buff_head g_rx_queue;
static u8 g_session_id;
static u16 g_apps = 0x1;
static int g_processing_rx;

/*
 * Context: softirq-serialized
 */
static u8 oz_get_new_session_id(u8 exclude)
{
	if (++g_session_id == 0)
		g_session_id = 1;
	if (g_session_id == exclude) {
		if (++g_session_id == 0)
			g_session_id = 1;
	}
	return g_session_id;
}

/*
 * Context: softirq-serialized
 */
static void oz_send_conn_rsp(struct oz_pd *pd, u8 status)
{
	struct sk_buff *skb;
	struct net_device *dev = pd->net_dev;
	struct oz_hdr *oz_hdr;
	struct oz_elt *elt;
	struct oz_elt_connect_rsp *body;

	int sz = sizeof(struct oz_hdr) + sizeof(struct oz_elt) +
			sizeof(struct oz_elt_connect_rsp);
	skb = alloc_skb(sz + OZ_ALLOCATED_SPACE(dev), GFP_ATOMIC);
	if (skb == NULL)
		return;
	skb_reserve(skb, LL_RESERVED_SPACE(dev));
	skb_reset_network_header(skb);
	oz_hdr = (struct oz_hdr *)skb_put(skb, sz);
	elt = (struct oz_elt *)(oz_hdr+1);
	body = (struct oz_elt_connect_rsp *)(elt+1);
	skb->dev = dev;
	skb->protocol = htons(OZ_ETHERTYPE);
	/* Fill in device header */
	if (dev_hard_header(skb, dev, OZ_ETHERTYPE, pd->mac_addr,
			dev->dev_addr, skb->len) < 0) {
		kfree_skb(skb);
		return;
	}
	oz_hdr->control = (OZ_PROTOCOL_VERSION<<OZ_VERSION_SHIFT);
	oz_hdr->last_pkt_num = 0;
	put_unaligned(0, &oz_hdr->pkt_num);
	elt->type = OZ_ELT_CONNECT_RSP;
	elt->length = sizeof(struct oz_elt_connect_rsp);
	memset(body, 0, sizeof(struct oz_elt_connect_rsp));
	body->status = status;
	if (status == 0) {
		body->mode = pd->mode;
		body->session_id = pd->session_id;
		put_unaligned(cpu_to_le16(pd->total_apps), &body->apps);
	}
	oz_dbg(ON, "TX: OZ_ELT_CONNECT_RSP %d", status);
	dev_queue_xmit(skb);
	return;
}

/*
 * Context: softirq-serialized
 */
static void pd_set_keepalive(struct oz_pd *pd, u8 kalive)
{
	unsigned long keep_alive = kalive & OZ_KALIVE_VALUE_MASK;

	switch (kalive & OZ_KALIVE_TYPE_MASK) {
	case OZ_KALIVE_SPECIAL:
		pd->keep_alive = keep_alive * 1000*60*60*24*20;
		break;
	case OZ_KALIVE_SECS:
		pd->keep_alive = keep_alive*1000;
		break;
	case OZ_KALIVE_MINS:
		pd->keep_alive = keep_alive*1000*60;
		break;
	case OZ_KALIVE_HOURS:
		pd->keep_alive = keep_alive*1000*60*60;
		break;
	default:
		pd->keep_alive = 0;
	}
	oz_dbg(ON, "Keepalive = %lu mSec\n", pd->keep_alive);
}

/*
 * Context: softirq-serialized
 */
static void pd_set_presleep(struct oz_pd *pd, u8 presleep, u8 start_timer)
{
	if (presleep)
		pd->presleep = presleep*100;
	else
		pd->presleep = OZ_PRESLEEP_TOUT;
	if (start_timer) {
		spin_unlock(&g_polling_lock);
		oz_timer_add(pd, OZ_TIMER_TOUT, pd->presleep);
		spin_lock(&g_polling_lock);
	}
	oz_dbg(ON, "Presleep time = %lu mSec\n", pd->presleep);
}

/*
 * Context: softirq-serialized
 */
static struct oz_pd *oz_connect_req(struct oz_pd *cur_pd, struct oz_elt *elt,
			const u8 *pd_addr, struct net_device *net_dev)
{
	struct oz_pd *pd;
	struct oz_elt_connect_req *body =
			(struct oz_elt_connect_req *)(elt+1);
	u8 rsp_status = OZ_STATUS_SUCCESS;
	u8 stop_needed = 0;
	u16 new_apps = g_apps;
	struct net_device *old_net_dev = NULL;
	struct oz_pd *free_pd = NULL;

	if (cur_pd) {
		pd = cur_pd;
		spin_lock_bh(&g_polling_lock);
	} else {
		struct oz_pd *pd2 = NULL;
		struct list_head *e;
		pd = oz_pd_alloc(pd_addr);
		if (pd == NULL)
			return NULL;
		getnstimeofday(&pd->last_rx_timestamp);
		spin_lock_bh(&g_polling_lock);
		list_for_each(e, &g_pd_list) {
			pd2 = container_of(e, struct oz_pd, link);
			if (ether_addr_equal(pd2->mac_addr, pd_addr)) {
				free_pd = pd;
				pd = pd2;
				break;
			}
		}
		if (pd != pd2)
			list_add_tail(&pd->link, &g_pd_list);
	}
	if (pd == NULL) {
		spin_unlock_bh(&g_polling_lock);
		return NULL;
	}
	if (pd->net_dev != net_dev) {
		old_net_dev = pd->net_dev;
		dev_hold(net_dev);
		pd->net_dev = net_dev;
	}
	oz_dbg(ON, "Host vendor: %d\n", body->host_vendor);
	pd->max_tx_size = OZ_MAX_TX_SIZE;
	pd->mode = body->mode;
	pd->pd_info = body->pd_info;
	if (pd->mode & OZ_F_ISOC_NO_ELTS) {
		pd->ms_per_isoc = body->ms_per_isoc;
		if (!pd->ms_per_isoc)
			pd->ms_per_isoc = 4;

		switch (body->ms_isoc_latency & OZ_LATENCY_MASK) {
		case OZ_ONE_MS_LATENCY:
			pd->isoc_latency = (body->ms_isoc_latency &
					~OZ_LATENCY_MASK) / pd->ms_per_isoc;
			break;
		case OZ_TEN_MS_LATENCY:
			pd->isoc_latency = ((body->ms_isoc_latency &
				~OZ_LATENCY_MASK) * 10) / pd->ms_per_isoc;
			break;
		default:
			pd->isoc_latency = OZ_MAX_TX_QUEUE_ISOC;
		}
	}
	if (body->max_len_div16)
		pd->max_tx_size = ((u16)body->max_len_div16)<<4;
	oz_dbg(ON, "Max frame:%u Ms per isoc:%u\n",
	       pd->max_tx_size, pd->ms_per_isoc);
	pd->max_stream_buffering = 3*1024;
	pd->pulse_period = OZ_QUANTUM;
	pd_set_presleep(pd, body->presleep, 0);
	pd_set_keepalive(pd, body->keep_alive);

	new_apps &= le16_to_cpu(get_unaligned(&body->apps));
	if ((new_apps & 0x1) && (body->session_id)) {
		if (pd->session_id) {
			if (pd->session_id != body->session_id) {
				rsp_status = OZ_STATUS_SESSION_MISMATCH;
				goto done;
			}
		} else {
			new_apps &= ~0x1;  /* Resume not permitted */
			pd->session_id =
				oz_get_new_session_id(body->session_id);
		}
	} else {
		if (pd->session_id && !body->session_id) {
			rsp_status = OZ_STATUS_SESSION_TEARDOWN;
			stop_needed = 1;
		} else {
			new_apps &= ~0x1;  /* Resume not permitted */
			pd->session_id =
				oz_get_new_session_id(body->session_id);
		}
	}
done:
	if (rsp_status == OZ_STATUS_SUCCESS) {
		u16 start_apps = new_apps & ~pd->total_apps & ~0x1;
		u16 stop_apps = pd->total_apps & ~new_apps & ~0x1;
		u16 resume_apps = new_apps & pd->paused_apps  & ~0x1;
		spin_unlock_bh(&g_polling_lock);
		oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
		oz_dbg(ON, "new_apps=0x%x total_apps=0x%x paused_apps=0x%x\n",
		       new_apps, pd->total_apps, pd->paused_apps);
		if (start_apps) {
			if (oz_services_start(pd, start_apps, 0))
				rsp_status = OZ_STATUS_TOO_MANY_PDS;
		}
		if (resume_apps)
			if (oz_services_start(pd, resume_apps, 1))
				rsp_status = OZ_STATUS_TOO_MANY_PDS;
		if (stop_apps)
			oz_services_stop(pd, stop_apps, 0);
		oz_pd_request_heartbeat(pd);
	} else {
		spin_unlock_bh(&g_polling_lock);
	}
	oz_send_conn_rsp(pd, rsp_status);
	if (rsp_status != OZ_STATUS_SUCCESS) {
		if (stop_needed)
			oz_pd_stop(pd);
		oz_pd_put(pd);
		pd = NULL;
	}
	if (old_net_dev)
		dev_put(old_net_dev);
	if (free_pd)
		oz_pd_destroy(free_pd);
	return pd;
}

/*
 * Context: softirq-serialized
 */
static void oz_add_farewell(struct oz_pd *pd, u8 ep_num, u8 index,
			const u8 *report, u8 len)
{
	struct oz_farewell *f;
	struct oz_farewell *f2;
	int found = 0;

	f = kmalloc(sizeof(struct oz_farewell) + len, GFP_ATOMIC);
	if (!f)
		return;
	f->ep_num = ep_num;
	f->index = index;
	f->len = len;
	memcpy(f->report, report, len);
	oz_dbg(ON, "RX: Adding farewell report\n");
	spin_lock(&g_polling_lock);
	list_for_each_entry(f2, &pd->farewell_list, link) {
		if ((f2->ep_num == ep_num) && (f2->index == index)) {
			found = 1;
			list_del(&f2->link);
			break;
		}
	}
	list_add_tail(&f->link, &pd->farewell_list);
	spin_unlock(&g_polling_lock);
	if (found)
		kfree(f2);
}

/*
 * Context: softirq-serialized
 */
static void oz_rx_frame(struct sk_buff *skb)
{
	u8 *mac_hdr;
	u8 *src_addr;
	struct oz_elt *elt;
	int length;
	struct oz_pd *pd = NULL;
	struct oz_hdr *oz_hdr = (struct oz_hdr *)skb_network_header(skb);
	struct timespec current_time;
	int dup = 0;
	u32 pkt_num;

	oz_dbg(RX_FRAMES, "RX frame PN=0x%x LPN=0x%x control=0x%x\n",
	       oz_hdr->pkt_num, oz_hdr->last_pkt_num, oz_hdr->control);
	mac_hdr = skb_mac_header(skb);
	src_addr = &mac_hdr[ETH_ALEN];
	length = skb->len;

	/* Check the version field */
	if (oz_get_prot_ver(oz_hdr->control) != OZ_PROTOCOL_VERSION) {
		oz_dbg(ON, "Incorrect protocol version: %d\n",
		       oz_get_prot_ver(oz_hdr->control));
		goto done;
	}

	pkt_num = le32_to_cpu(get_unaligned(&oz_hdr->pkt_num));

	pd = oz_pd_find(src_addr);
	if (pd) {
		if (!(pd->state & OZ_PD_S_CONNECTED))
			oz_pd_set_state(pd, OZ_PD_S_CONNECTED);
		getnstimeofday(&current_time);
		if ((current_time.tv_sec != pd->last_rx_timestamp.tv_sec) ||
			(pd->presleep < MSEC_PER_SEC))  {
			oz_timer_add(pd, OZ_TIMER_TOUT,	pd->presleep);
			pd->last_rx_timestamp = current_time;
		}
		if (pkt_num != pd->last_rx_pkt_num) {
			pd->last_rx_pkt_num = pkt_num;
		} else {
			dup = 1;
			oz_dbg(ON, "Duplicate frame\n");
		}
	}

	if (pd && !dup && ((pd->mode & OZ_MODE_MASK) == OZ_MODE_TRIGGERED)) {
		oz_dbg(RX_FRAMES, "Received TRIGGER Frame\n");
		pd->last_sent_frame = &pd->tx_queue;
		if (oz_hdr->control & OZ_F_ACK) {
			/* Retire completed frames */
			oz_retire_tx_frames(pd, oz_hdr->last_pkt_num);
		}
		if ((oz_hdr->control & OZ_F_ACK_REQUESTED) &&
				(pd->state == OZ_PD_S_CONNECTED)) {
			int backlog = pd->nb_queued_frames;
			pd->trigger_pkt_num = pkt_num;
			/* Send queued frames */
			oz_send_queued_frames(pd, backlog);
		}
	}

	length -= sizeof(struct oz_hdr);
	elt = (struct oz_elt *)((u8 *)oz_hdr + sizeof(struct oz_hdr));

	while (length >= sizeof(struct oz_elt)) {
		length -= sizeof(struct oz_elt) + elt->length;
		if (length < 0)
			break;
		switch (elt->type) {
		case OZ_ELT_CONNECT_REQ:
			oz_dbg(ON, "RX: OZ_ELT_CONNECT_REQ\n");
			pd = oz_connect_req(pd, elt, src_addr, skb->dev);
			break;
		case OZ_ELT_DISCONNECT:
			oz_dbg(ON, "RX: OZ_ELT_DISCONNECT\n");
			if (pd)
				oz_pd_sleep(pd);
			break;
		case OZ_ELT_UPDATE_PARAM_REQ: {
				struct oz_elt_update_param *body =
					(struct oz_elt_update_param *)(elt + 1);
				oz_dbg(ON, "RX: OZ_ELT_UPDATE_PARAM_REQ\n");
				if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
					spin_lock(&g_polling_lock);
					pd_set_keepalive(pd, body->keepalive);
					pd_set_presleep(pd, body->presleep, 1);
					spin_unlock(&g_polling_lock);
				}
			}
			break;
		case OZ_ELT_FAREWELL_REQ: {
				struct oz_elt_farewell *body =
					(struct oz_elt_farewell *)(elt + 1);
				oz_dbg(ON, "RX: OZ_ELT_FAREWELL_REQ\n");
				oz_add_farewell(pd, body->ep_num,
					body->index, body->report,
					elt->length + 1 - sizeof(*body));
			}
			break;
		case OZ_ELT_APP_DATA:
			if (pd && (pd->state & OZ_PD_S_CONNECTED)) {
				struct oz_app_hdr *app_hdr =
					(struct oz_app_hdr *)(elt+1);
				if (dup)
					break;
				oz_handle_app_elt(pd, app_hdr->app_id, elt);
			}
			break;
		default:
			oz_dbg(ON, "RX: Unknown elt %02x\n", elt->type);
		}
		elt = oz_next_elt(elt);
	}
done:
	if (pd)
		oz_pd_put(pd);
	consume_skb(skb);
}

/*
 * Context: process
 */
void oz_protocol_term(void)
{
	struct oz_binding *b, *t;

	/* Walk the list of bindings and remove each one.
	 */
	spin_lock_bh(&g_binding_lock);
	list_for_each_entry_safe(b, t, &g_binding, link) {
		list_del(&b->link);
		spin_unlock_bh(&g_binding_lock);
		dev_remove_pack(&b->ptype);
		if (b->ptype.dev)
			dev_put(b->ptype.dev);
		kfree(b);
		spin_lock_bh(&g_binding_lock);
	}
	spin_unlock_bh(&g_binding_lock);
	/* Walk the list of PDs and stop each one. This causes the PD to be
	 * removed from the list so we can just pull each one from the head
	 * of the list.
	 */
	spin_lock_bh(&g_polling_lock);
	while (!list_empty(&g_pd_list)) {
		struct oz_pd *pd =
			list_first_entry(&g_pd_list, struct oz_pd, link);
		oz_pd_get(pd);
		spin_unlock_bh(&g_polling_lock);
		oz_pd_stop(pd);
		oz_pd_put(pd);
		spin_lock_bh(&g_polling_lock);
	}
	spin_unlock_bh(&g_polling_lock);
	oz_dbg(ON, "Protocol stopped\n");
}

/*
 * Context: softirq
 */
void oz_pd_heartbeat_handler(unsigned long data)
{
	struct oz_pd *pd = (struct oz_pd *)data;
	u16 apps = 0;

	spin_lock_bh(&g_polling_lock);
	if (pd->state & OZ_PD_S_CONNECTED)
		apps = pd->total_apps;
	spin_unlock_bh(&g_polling_lock);
	if (apps)
		oz_pd_heartbeat(pd, apps);
	oz_pd_put(pd);
}

/*
 * Context: softirq
 */
void oz_pd_timeout_handler(unsigned long data)
{
	int type;
	struct oz_pd *pd = (struct oz_pd *)data;

	spin_lock_bh(&g_polling_lock);
	type = pd->timeout_type;
	spin_unlock_bh(&g_polling_lock);
	switch (type) {
	case OZ_TIMER_TOUT:
		oz_pd_sleep(pd);
		break;
	case OZ_TIMER_STOP:
		oz_pd_stop(pd);
		break;
	}
	oz_pd_put(pd);
}

/*
 * Context: Interrupt
 */
enum hrtimer_restart oz_pd_heartbeat_event(struct hrtimer *timer)
{
	struct oz_pd *pd;

	pd = container_of(timer, struct oz_pd, heartbeat);
	hrtimer_forward_now(timer, ktime_set(pd->pulse_period /
	MSEC_PER_SEC, (pd->pulse_period % MSEC_PER_SEC) * NSEC_PER_MSEC));
	oz_pd_get(pd);
	tasklet_schedule(&pd->heartbeat_tasklet);
	return HRTIMER_RESTART;
}

/*
 * Context: Interrupt
 */
enum hrtimer_restart oz_pd_timeout_event(struct hrtimer *timer)
{
	struct oz_pd *pd;

	pd = container_of(timer, struct oz_pd, timeout);
	oz_pd_get(pd);
	tasklet_schedule(&pd->timeout_tasklet);
	return HRTIMER_NORESTART;
}

/*
 * Context: softirq or process
 */
void oz_timer_add(struct oz_pd *pd, int type, unsigned long due_time)
{
	spin_lock_bh(&g_polling_lock);
	switch (type) {
	case OZ_TIMER_TOUT:
	case OZ_TIMER_STOP:
		if (hrtimer_active(&pd->timeout)) {
			hrtimer_set_expires(&pd->timeout, ktime_set(due_time /
			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
							NSEC_PER_MSEC));
			hrtimer_start_expires(&pd->timeout, HRTIMER_MODE_REL);
		} else {
			hrtimer_start(&pd->timeout, ktime_set(due_time /
			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
					NSEC_PER_MSEC), HRTIMER_MODE_REL);
		}
		pd->timeout_type = type;
		break;
	case OZ_TIMER_HEARTBEAT:
		if (!hrtimer_active(&pd->heartbeat))
			hrtimer_start(&pd->heartbeat, ktime_set(due_time /
			MSEC_PER_SEC, (due_time % MSEC_PER_SEC) *
					NSEC_PER_MSEC), HRTIMER_MODE_REL);
		break;
	}
	spin_unlock_bh(&g_polling_lock);
}

/*
 * Context: softirq or process
 */
void oz_pd_request_heartbeat(struct oz_pd *pd)
{
	oz_timer_add(pd, OZ_TIMER_HEARTBEAT, pd->pulse_period > 0 ?
					pd->pulse_period : OZ_QUANTUM);
}

/*
 * Context: softirq or process
 */
struct oz_pd *oz_pd_find(const u8 *mac_addr)
{
	struct oz_pd *pd;
	struct list_head *e;

	spin_lock_bh(&g_polling_lock);
	list_for_each(e, &g_pd_list) {
		pd = container_of(e, struct oz_pd, link);
		if (ether_addr_equal(pd->mac_addr, mac_addr)) {
			atomic_inc(&pd->ref_count);
			spin_unlock_bh(&g_polling_lock);
			return pd;
		}
	}
	spin_unlock_bh(&g_polling_lock);
	return NULL;
}

/*
 * Context: process
 */
void oz_app_enable(int app_id, int enable)
{
	if (app_id <= OZ_APPID_MAX) {
		spin_lock_bh(&g_polling_lock);
		if (enable)
			g_apps |= (1<<app_id);
		else
			g_apps &= ~(1<<app_id);
		spin_unlock_bh(&g_polling_lock);
	}
}

/*
 * Context: softirq
 */
static int oz_pkt_recv(struct sk_buff *skb, struct net_device *dev,
		struct packet_type *pt, struct net_device *orig_dev)
{
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (skb == NULL)
		return 0;
	spin_lock_bh(&g_rx_queue.lock);
	if (g_processing_rx) {
		/* We already hold the lock so use __ variant.
		 */
		__skb_queue_head(&g_rx_queue, skb);
		spin_unlock_bh(&g_rx_queue.lock);
	} else {
		g_processing_rx = 1;
		do {

			spin_unlock_bh(&g_rx_queue.lock);
			oz_rx_frame(skb);
			spin_lock_bh(&g_rx_queue.lock);
			if (skb_queue_empty(&g_rx_queue)) {
				g_processing_rx = 0;
				spin_unlock_bh(&g_rx_queue.lock);
				break;
			}
			/* We already hold the lock so use __ variant.
			 */
			skb = __skb_dequeue(&g_rx_queue);
		} while (1);
	}
	return 0;
}

/*
 * Context: process
 */
void oz_binding_add(const char *net_dev)
{
	struct oz_binding *binding;

	binding = kmalloc(sizeof(struct oz_binding), GFP_KERNEL);
	if (binding) {
		binding->ptype.type = __constant_htons(OZ_ETHERTYPE);
		binding->ptype.func = oz_pkt_recv;
		if (net_dev && *net_dev) {
			memcpy(binding->name, net_dev, OZ_MAX_BINDING_LEN);
			oz_dbg(ON, "Adding binding: %s\n", net_dev);
			binding->ptype.dev =
				dev_get_by_name(&init_net, net_dev);
			if (binding->ptype.dev == NULL) {
				oz_dbg(ON, "Netdev %s not found\n", net_dev);
				kfree(binding);
				binding = NULL;
			}
		} else {
			oz_dbg(ON, "Binding to all netcards\n");
			memset(binding->name, 0, OZ_MAX_BINDING_LEN);
			binding->ptype.dev = NULL;
		}
		if (binding) {
			dev_add_pack(&binding->ptype);
			spin_lock_bh(&g_binding_lock);
			list_add_tail(&binding->link, &g_binding);
			spin_unlock_bh(&g_binding_lock);
		}
	}
}

/*
 * Context: process
 */
static void pd_stop_all_for_device(struct net_device *net_dev)
{
	struct list_head h;
	struct oz_pd *pd;
	struct oz_pd *n;

	INIT_LIST_HEAD(&h);
	spin_lock_bh(&g_polling_lock);
	list_for_each_entry_safe(pd, n, &g_pd_list, link) {
		if (pd->net_dev == net_dev) {
			list_move(&pd->link, &h);
			oz_pd_get(pd);
		}
	}
	spin_unlock_bh(&g_polling_lock);
	while (!list_empty(&h)) {
		pd = list_first_entry(&h, struct oz_pd, link);
		oz_pd_stop(pd);
		oz_pd_put(pd);
	}
}

/*
 * Context: process
 */
void oz_binding_remove(const char *net_dev)
{
	struct oz_binding *binding;
	int found = 0;

	oz_dbg(ON, "Removing binding: %s\n", net_dev);
	spin_lock_bh(&g_binding_lock);
	list_for_each_entry(binding, &g_binding, link) {
		if (strncmp(binding->name, net_dev, OZ_MAX_BINDING_LEN) == 0) {
			oz_dbg(ON, "Binding '%s' found\n", net_dev);
			found = 1;
			break;
		}
	}
	spin_unlock_bh(&g_binding_lock);
	if (found) {
		dev_remove_pack(&binding->ptype);
		if (binding->ptype.dev) {
			dev_put(binding->ptype.dev);
			pd_stop_all_for_device(binding->ptype.dev);
		}
		list_del(&binding->link);
		kfree(binding);
	}
}

/*
 * Context: process
 */
static char *oz_get_next_device_name(char *s, char *dname, int max_size)
{
	while (*s == ',')
		s++;
	while (*s && (*s != ',') && max_size > 1) {
		*dname++ = *s++;
		max_size--;
	}
	*dname = 0;
	return s;
}

/*
 * Context: process
 */
int oz_protocol_init(char *devs)
{
	skb_queue_head_init(&g_rx_queue);
	if (devs && (devs[0] == '*')) {
		oz_binding_add(NULL);
	} else {
		char d[32];
		while (*devs) {
			devs = oz_get_next_device_name(devs, d, sizeof(d));
			if (d[0])
				oz_binding_add(d);
		}
	}
	return 0;
}

/*
 * Context: process
 */
int oz_get_pd_list(struct oz_mac_addr *addr, int max_count)
{
	struct oz_pd *pd;
	struct list_head *e;
	int count = 0;

	spin_lock_bh(&g_polling_lock);
	list_for_each(e, &g_pd_list) {
		if (count >= max_count)
			break;
		pd = container_of(e, struct oz_pd, link);
		memcpy(&addr[count++], pd->mac_addr, ETH_ALEN);
	}
	spin_unlock_bh(&g_polling_lock);
	return count;
}

void oz_polling_lock_bh(void)
{
	spin_lock_bh(&g_polling_lock);
}

void oz_polling_unlock_bh(void)
{
	spin_unlock_bh(&g_polling_lock);
}