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19#include <linux/module.h>
20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/netdevice.h>
23#include <linux/if_arp.h>
24#include <linux/can.h>
25#include <linux/can/dev.h>
26#include <linux/can/skb.h>
27#include <linux/can/netlink.h>
28#include <linux/can/led.h>
29#include <net/rtnetlink.h>
30
31#define MOD_DESC "CAN device driver interface"
32
33MODULE_DESCRIPTION(MOD_DESC);
34MODULE_LICENSE("GPL v2");
35MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
36
37
38
39static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
40 8, 12, 16, 20, 24, 32, 48, 64};
41
42
43u8 can_dlc2len(u8 can_dlc)
44{
45 return dlc2len[can_dlc & 0x0F];
46}
47EXPORT_SYMBOL_GPL(can_dlc2len);
48
49static const u8 len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
50 9, 9, 9, 9,
51 10, 10, 10, 10,
52 11, 11, 11, 11,
53 12, 12, 12, 12,
54 13, 13, 13, 13, 13, 13, 13, 13,
55 14, 14, 14, 14, 14, 14, 14, 14,
56 14, 14, 14, 14, 14, 14, 14, 14,
57 15, 15, 15, 15, 15, 15, 15, 15,
58 15, 15, 15, 15, 15, 15, 15, 15};
59
60
61u8 can_len2dlc(u8 len)
62{
63 if (unlikely(len > 64))
64 return 0xF;
65
66 return len2dlc[len];
67}
68EXPORT_SYMBOL_GPL(can_len2dlc);
69
70#ifdef CONFIG_CAN_CALC_BITTIMING
71#define CAN_CALC_MAX_ERROR 50
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86static int can_update_spt(const struct can_bittiming_const *btc,
87 int sampl_pt, int tseg, int *tseg1, int *tseg2)
88{
89 *tseg2 = tseg + 1 - (sampl_pt * (tseg + 1)) / 1000;
90 if (*tseg2 < btc->tseg2_min)
91 *tseg2 = btc->tseg2_min;
92 if (*tseg2 > btc->tseg2_max)
93 *tseg2 = btc->tseg2_max;
94 *tseg1 = tseg - *tseg2;
95 if (*tseg1 > btc->tseg1_max) {
96 *tseg1 = btc->tseg1_max;
97 *tseg2 = tseg - *tseg1;
98 }
99 return 1000 * (tseg + 1 - *tseg2) / (tseg + 1);
100}
101
102static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
103 const struct can_bittiming_const *btc)
104{
105 struct can_priv *priv = netdev_priv(dev);
106 long best_error = 1000000000, error = 0;
107 int best_tseg = 0, best_brp = 0, brp = 0;
108 int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0;
109 int spt_error = 1000, spt = 0, sampl_pt;
110 long rate;
111 u64 v64;
112
113
114 if (bt->sample_point) {
115 sampl_pt = bt->sample_point;
116 } else {
117 if (bt->bitrate > 800000)
118 sampl_pt = 750;
119 else if (bt->bitrate > 500000)
120 sampl_pt = 800;
121 else
122 sampl_pt = 875;
123 }
124
125
126 for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1;
127 tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) {
128 tsegall = 1 + tseg / 2;
129
130 brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2;
131
132 brp = (brp / btc->brp_inc) * btc->brp_inc;
133 if ((brp < btc->brp_min) || (brp > btc->brp_max))
134 continue;
135 rate = priv->clock.freq / (brp * tsegall);
136 error = bt->bitrate - rate;
137
138 if (error < 0)
139 error = -error;
140 if (error > best_error)
141 continue;
142 best_error = error;
143 if (error == 0) {
144 spt = can_update_spt(btc, sampl_pt, tseg / 2,
145 &tseg1, &tseg2);
146 error = sampl_pt - spt;
147 if (error < 0)
148 error = -error;
149 if (error > spt_error)
150 continue;
151 spt_error = error;
152 }
153 best_tseg = tseg / 2;
154 best_brp = brp;
155 if (error == 0)
156 break;
157 }
158
159 if (best_error) {
160
161 error = (best_error * 1000) / bt->bitrate;
162 if (error > CAN_CALC_MAX_ERROR) {
163 netdev_err(dev,
164 "bitrate error %ld.%ld%% too high\n",
165 error / 10, error % 10);
166 return -EDOM;
167 } else {
168 netdev_warn(dev, "bitrate error %ld.%ld%%\n",
169 error / 10, error % 10);
170 }
171 }
172
173
174 bt->sample_point = can_update_spt(btc, sampl_pt, best_tseg,
175 &tseg1, &tseg2);
176
177 v64 = (u64)best_brp * 1000000000UL;
178 do_div(v64, priv->clock.freq);
179 bt->tq = (u32)v64;
180 bt->prop_seg = tseg1 / 2;
181 bt->phase_seg1 = tseg1 - bt->prop_seg;
182 bt->phase_seg2 = tseg2;
183
184
185 if (!bt->sjw || !btc->sjw_max)
186 bt->sjw = 1;
187 else {
188
189 if (bt->sjw > btc->sjw_max)
190 bt->sjw = btc->sjw_max;
191
192 if (tseg2 < bt->sjw)
193 bt->sjw = tseg2;
194 }
195
196 bt->brp = best_brp;
197
198 bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1));
199
200 return 0;
201}
202#else
203static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
204 const struct can_bittiming_const *btc)
205{
206 netdev_err(dev, "bit-timing calculation not available\n");
207 return -EINVAL;
208}
209#endif
210
211
212
213
214
215
216
217static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt,
218 const struct can_bittiming_const *btc)
219{
220 struct can_priv *priv = netdev_priv(dev);
221 int tseg1, alltseg;
222 u64 brp64;
223
224 tseg1 = bt->prop_seg + bt->phase_seg1;
225 if (!bt->sjw)
226 bt->sjw = 1;
227 if (bt->sjw > btc->sjw_max ||
228 tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max ||
229 bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max)
230 return -ERANGE;
231
232 brp64 = (u64)priv->clock.freq * (u64)bt->tq;
233 if (btc->brp_inc > 1)
234 do_div(brp64, btc->brp_inc);
235 brp64 += 500000000UL - 1;
236 do_div(brp64, 1000000000UL);
237 if (btc->brp_inc > 1)
238 brp64 *= btc->brp_inc;
239 bt->brp = (u32)brp64;
240
241 if (bt->brp < btc->brp_min || bt->brp > btc->brp_max)
242 return -EINVAL;
243
244 alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1;
245 bt->bitrate = priv->clock.freq / (bt->brp * alltseg);
246 bt->sample_point = ((tseg1 + 1) * 1000) / alltseg;
247
248 return 0;
249}
250
251static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt,
252 const struct can_bittiming_const *btc)
253{
254 int err;
255
256
257 if (!btc)
258 return -EOPNOTSUPP;
259
260
261
262
263
264
265
266 if (!bt->tq && bt->bitrate)
267 err = can_calc_bittiming(dev, bt, btc);
268 else if (bt->tq && !bt->bitrate)
269 err = can_fixup_bittiming(dev, bt, btc);
270 else
271 err = -EINVAL;
272
273 return err;
274}
275
276static void can_update_state_error_stats(struct net_device *dev,
277 enum can_state new_state)
278{
279 struct can_priv *priv = netdev_priv(dev);
280
281 if (new_state <= priv->state)
282 return;
283
284 switch (new_state) {
285 case CAN_STATE_ERROR_WARNING:
286 priv->can_stats.error_warning++;
287 break;
288 case CAN_STATE_ERROR_PASSIVE:
289 priv->can_stats.error_passive++;
290 break;
291 case CAN_STATE_BUS_OFF:
292 priv->can_stats.bus_off++;
293 break;
294 default:
295 break;
296 }
297}
298
299static int can_tx_state_to_frame(struct net_device *dev, enum can_state state)
300{
301 switch (state) {
302 case CAN_STATE_ERROR_ACTIVE:
303 return CAN_ERR_CRTL_ACTIVE;
304 case CAN_STATE_ERROR_WARNING:
305 return CAN_ERR_CRTL_TX_WARNING;
306 case CAN_STATE_ERROR_PASSIVE:
307 return CAN_ERR_CRTL_TX_PASSIVE;
308 default:
309 return 0;
310 }
311}
312
313static int can_rx_state_to_frame(struct net_device *dev, enum can_state state)
314{
315 switch (state) {
316 case CAN_STATE_ERROR_ACTIVE:
317 return CAN_ERR_CRTL_ACTIVE;
318 case CAN_STATE_ERROR_WARNING:
319 return CAN_ERR_CRTL_RX_WARNING;
320 case CAN_STATE_ERROR_PASSIVE:
321 return CAN_ERR_CRTL_RX_PASSIVE;
322 default:
323 return 0;
324 }
325}
326
327void can_change_state(struct net_device *dev, struct can_frame *cf,
328 enum can_state tx_state, enum can_state rx_state)
329{
330 struct can_priv *priv = netdev_priv(dev);
331 enum can_state new_state = max(tx_state, rx_state);
332
333 if (unlikely(new_state == priv->state)) {
334 netdev_warn(dev, "%s: oops, state did not change", __func__);
335 return;
336 }
337
338 netdev_dbg(dev, "New error state: %d\n", new_state);
339
340 can_update_state_error_stats(dev, new_state);
341 priv->state = new_state;
342
343 if (unlikely(new_state == CAN_STATE_BUS_OFF)) {
344 cf->can_id |= CAN_ERR_BUSOFF;
345 return;
346 }
347
348 cf->can_id |= CAN_ERR_CRTL;
349 cf->data[1] |= tx_state >= rx_state ?
350 can_tx_state_to_frame(dev, tx_state) : 0;
351 cf->data[1] |= tx_state <= rx_state ?
352 can_rx_state_to_frame(dev, rx_state) : 0;
353}
354EXPORT_SYMBOL_GPL(can_change_state);
355
356
357
358
359
360
361
362
363
364
365
366static void can_flush_echo_skb(struct net_device *dev)
367{
368 struct can_priv *priv = netdev_priv(dev);
369 struct net_device_stats *stats = &dev->stats;
370 int i;
371
372 for (i = 0; i < priv->echo_skb_max; i++) {
373 if (priv->echo_skb[i]) {
374 kfree_skb(priv->echo_skb[i]);
375 priv->echo_skb[i] = NULL;
376 stats->tx_dropped++;
377 stats->tx_aborted_errors++;
378 }
379 }
380}
381
382
383
384
385
386
387
388
389void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
390 unsigned int idx)
391{
392 struct can_priv *priv = netdev_priv(dev);
393
394 BUG_ON(idx >= priv->echo_skb_max);
395
396
397 if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK ||
398 (skb->protocol != htons(ETH_P_CAN) &&
399 skb->protocol != htons(ETH_P_CANFD))) {
400 kfree_skb(skb);
401 return;
402 }
403
404 if (!priv->echo_skb[idx]) {
405
406 skb = can_create_echo_skb(skb);
407 if (!skb)
408 return;
409
410
411 skb->pkt_type = PACKET_BROADCAST;
412 skb->ip_summed = CHECKSUM_UNNECESSARY;
413 skb->dev = dev;
414
415
416 priv->echo_skb[idx] = skb;
417 } else {
418
419 netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__);
420 kfree_skb(skb);
421 }
422}
423EXPORT_SYMBOL_GPL(can_put_echo_skb);
424
425
426
427
428
429
430
431
432unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
433{
434 struct can_priv *priv = netdev_priv(dev);
435
436 BUG_ON(idx >= priv->echo_skb_max);
437
438 if (priv->echo_skb[idx]) {
439 struct sk_buff *skb = priv->echo_skb[idx];
440 struct can_frame *cf = (struct can_frame *)skb->data;
441 u8 dlc = cf->can_dlc;
442
443 netif_rx(priv->echo_skb[idx]);
444 priv->echo_skb[idx] = NULL;
445
446 return dlc;
447 }
448
449 return 0;
450}
451EXPORT_SYMBOL_GPL(can_get_echo_skb);
452
453
454
455
456
457
458void can_free_echo_skb(struct net_device *dev, unsigned int idx)
459{
460 struct can_priv *priv = netdev_priv(dev);
461
462 BUG_ON(idx >= priv->echo_skb_max);
463
464 if (priv->echo_skb[idx]) {
465 dev_kfree_skb_any(priv->echo_skb[idx]);
466 priv->echo_skb[idx] = NULL;
467 }
468}
469EXPORT_SYMBOL_GPL(can_free_echo_skb);
470
471
472
473
474static void can_restart(unsigned long data)
475{
476 struct net_device *dev = (struct net_device *)data;
477 struct can_priv *priv = netdev_priv(dev);
478 struct net_device_stats *stats = &dev->stats;
479 struct sk_buff *skb;
480 struct can_frame *cf;
481 int err;
482
483 BUG_ON(netif_carrier_ok(dev));
484
485
486
487
488
489 can_flush_echo_skb(dev);
490
491
492 skb = alloc_can_err_skb(dev, &cf);
493 if (skb == NULL) {
494 err = -ENOMEM;
495 goto restart;
496 }
497 cf->can_id |= CAN_ERR_RESTARTED;
498
499 netif_rx(skb);
500
501 stats->rx_packets++;
502 stats->rx_bytes += cf->can_dlc;
503
504restart:
505 netdev_dbg(dev, "restarted\n");
506 priv->can_stats.restarts++;
507
508
509 err = priv->do_set_mode(dev, CAN_MODE_START);
510
511 netif_carrier_on(dev);
512 if (err)
513 netdev_err(dev, "Error %d during restart", err);
514}
515
516int can_restart_now(struct net_device *dev)
517{
518 struct can_priv *priv = netdev_priv(dev);
519
520
521
522
523
524 if (priv->restart_ms)
525 return -EINVAL;
526 if (priv->state != CAN_STATE_BUS_OFF)
527 return -EBUSY;
528
529
530 mod_timer(&priv->restart_timer, jiffies);
531
532 return 0;
533}
534
535
536
537
538
539
540
541
542void can_bus_off(struct net_device *dev)
543{
544 struct can_priv *priv = netdev_priv(dev);
545
546 netdev_dbg(dev, "bus-off\n");
547
548 netif_carrier_off(dev);
549
550 if (priv->restart_ms)
551 mod_timer(&priv->restart_timer,
552 jiffies + (priv->restart_ms * HZ) / 1000);
553}
554EXPORT_SYMBOL_GPL(can_bus_off);
555
556static void can_setup(struct net_device *dev)
557{
558 dev->type = ARPHRD_CAN;
559 dev->mtu = CAN_MTU;
560 dev->hard_header_len = 0;
561 dev->addr_len = 0;
562 dev->tx_queue_len = 10;
563
564
565 dev->flags = IFF_NOARP;
566 dev->features = NETIF_F_HW_CSUM;
567}
568
569struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
570{
571 struct sk_buff *skb;
572
573 skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) +
574 sizeof(struct can_frame));
575 if (unlikely(!skb))
576 return NULL;
577
578 skb->protocol = htons(ETH_P_CAN);
579 skb->pkt_type = PACKET_BROADCAST;
580 skb->ip_summed = CHECKSUM_UNNECESSARY;
581
582 skb_reset_mac_header(skb);
583 skb_reset_network_header(skb);
584 skb_reset_transport_header(skb);
585
586 can_skb_reserve(skb);
587 can_skb_prv(skb)->ifindex = dev->ifindex;
588 can_skb_prv(skb)->skbcnt = 0;
589
590 *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
591 memset(*cf, 0, sizeof(struct can_frame));
592
593 return skb;
594}
595EXPORT_SYMBOL_GPL(alloc_can_skb);
596
597struct sk_buff *alloc_canfd_skb(struct net_device *dev,
598 struct canfd_frame **cfd)
599{
600 struct sk_buff *skb;
601
602 skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) +
603 sizeof(struct canfd_frame));
604 if (unlikely(!skb))
605 return NULL;
606
607 skb->protocol = htons(ETH_P_CANFD);
608 skb->pkt_type = PACKET_BROADCAST;
609 skb->ip_summed = CHECKSUM_UNNECESSARY;
610
611 skb_reset_mac_header(skb);
612 skb_reset_network_header(skb);
613 skb_reset_transport_header(skb);
614
615 can_skb_reserve(skb);
616 can_skb_prv(skb)->ifindex = dev->ifindex;
617 can_skb_prv(skb)->skbcnt = 0;
618
619 *cfd = (struct canfd_frame *)skb_put(skb, sizeof(struct canfd_frame));
620 memset(*cfd, 0, sizeof(struct canfd_frame));
621
622 return skb;
623}
624EXPORT_SYMBOL_GPL(alloc_canfd_skb);
625
626struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
627{
628 struct sk_buff *skb;
629
630 skb = alloc_can_skb(dev, cf);
631 if (unlikely(!skb))
632 return NULL;
633
634 (*cf)->can_id = CAN_ERR_FLAG;
635 (*cf)->can_dlc = CAN_ERR_DLC;
636
637 return skb;
638}
639EXPORT_SYMBOL_GPL(alloc_can_err_skb);
640
641
642
643
644struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max)
645{
646 struct net_device *dev;
647 struct can_priv *priv;
648 int size;
649
650 if (echo_skb_max)
651 size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
652 echo_skb_max * sizeof(struct sk_buff *);
653 else
654 size = sizeof_priv;
655
656 dev = alloc_netdev(size, "can%d", NET_NAME_UNKNOWN, can_setup);
657 if (!dev)
658 return NULL;
659
660 priv = netdev_priv(dev);
661
662 if (echo_skb_max) {
663 priv->echo_skb_max = echo_skb_max;
664 priv->echo_skb = (void *)priv +
665 ALIGN(sizeof_priv, sizeof(struct sk_buff *));
666 }
667
668 priv->state = CAN_STATE_STOPPED;
669
670 init_timer(&priv->restart_timer);
671
672 return dev;
673}
674EXPORT_SYMBOL_GPL(alloc_candev);
675
676
677
678
679void free_candev(struct net_device *dev)
680{
681 free_netdev(dev);
682}
683EXPORT_SYMBOL_GPL(free_candev);
684
685
686
687
688int can_change_mtu(struct net_device *dev, int new_mtu)
689{
690 struct can_priv *priv = netdev_priv(dev);
691
692
693 if (dev->flags & IFF_UP)
694 return -EBUSY;
695
696
697 switch (new_mtu) {
698 case CAN_MTU:
699 priv->ctrlmode &= ~CAN_CTRLMODE_FD;
700 break;
701
702 case CANFD_MTU:
703 if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD))
704 return -EINVAL;
705
706 priv->ctrlmode |= CAN_CTRLMODE_FD;
707 break;
708
709 default:
710 return -EINVAL;
711 }
712
713 dev->mtu = new_mtu;
714 return 0;
715}
716EXPORT_SYMBOL_GPL(can_change_mtu);
717
718
719
720
721
722
723
724int open_candev(struct net_device *dev)
725{
726 struct can_priv *priv = netdev_priv(dev);
727
728 if (!priv->bittiming.bitrate) {
729 netdev_err(dev, "bit-timing not yet defined\n");
730 return -EINVAL;
731 }
732
733
734 if ((priv->ctrlmode & CAN_CTRLMODE_FD) &&
735 (!priv->data_bittiming.bitrate ||
736 (priv->data_bittiming.bitrate < priv->bittiming.bitrate))) {
737 netdev_err(dev, "incorrect/missing data bit-timing\n");
738 return -EINVAL;
739 }
740
741
742 if (!netif_carrier_ok(dev))
743 netif_carrier_on(dev);
744
745 setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev);
746
747 return 0;
748}
749EXPORT_SYMBOL_GPL(open_candev);
750
751
752
753
754
755
756
757void close_candev(struct net_device *dev)
758{
759 struct can_priv *priv = netdev_priv(dev);
760
761 del_timer_sync(&priv->restart_timer);
762 can_flush_echo_skb(dev);
763}
764EXPORT_SYMBOL_GPL(close_candev);
765
766
767
768
769static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
770 [IFLA_CAN_STATE] = { .type = NLA_U32 },
771 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
772 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
773 [IFLA_CAN_RESTART] = { .type = NLA_U32 },
774 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
775 [IFLA_CAN_BITTIMING_CONST]
776 = { .len = sizeof(struct can_bittiming_const) },
777 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
778 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
779 [IFLA_CAN_DATA_BITTIMING]
780 = { .len = sizeof(struct can_bittiming) },
781 [IFLA_CAN_DATA_BITTIMING_CONST]
782 = { .len = sizeof(struct can_bittiming_const) },
783};
784
785static int can_changelink(struct net_device *dev,
786 struct nlattr *tb[], struct nlattr *data[])
787{
788 struct can_priv *priv = netdev_priv(dev);
789 int err;
790
791
792 ASSERT_RTNL();
793
794 if (data[IFLA_CAN_BITTIMING]) {
795 struct can_bittiming bt;
796
797
798 if (dev->flags & IFF_UP)
799 return -EBUSY;
800 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
801 err = can_get_bittiming(dev, &bt, priv->bittiming_const);
802 if (err)
803 return err;
804 memcpy(&priv->bittiming, &bt, sizeof(bt));
805
806 if (priv->do_set_bittiming) {
807
808 err = priv->do_set_bittiming(dev);
809 if (err)
810 return err;
811 }
812 }
813
814 if (data[IFLA_CAN_CTRLMODE]) {
815 struct can_ctrlmode *cm;
816
817
818 if (dev->flags & IFF_UP)
819 return -EBUSY;
820 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
821
822
823 if (cm->mask & ~priv->ctrlmode_supported)
824 return -EOPNOTSUPP;
825
826
827 priv->ctrlmode &= ~cm->mask;
828 priv->ctrlmode |= (cm->flags & cm->mask);
829
830
831 if (priv->ctrlmode & CAN_CTRLMODE_FD)
832 dev->mtu = CANFD_MTU;
833 else
834 dev->mtu = CAN_MTU;
835 }
836
837 if (data[IFLA_CAN_RESTART_MS]) {
838
839 if (dev->flags & IFF_UP)
840 return -EBUSY;
841 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
842 }
843
844 if (data[IFLA_CAN_RESTART]) {
845
846 if (!(dev->flags & IFF_UP))
847 return -EINVAL;
848 err = can_restart_now(dev);
849 if (err)
850 return err;
851 }
852
853 if (data[IFLA_CAN_DATA_BITTIMING]) {
854 struct can_bittiming dbt;
855
856
857 if (dev->flags & IFF_UP)
858 return -EBUSY;
859 memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),
860 sizeof(dbt));
861 err = can_get_bittiming(dev, &dbt, priv->data_bittiming_const);
862 if (err)
863 return err;
864 memcpy(&priv->data_bittiming, &dbt, sizeof(dbt));
865
866 if (priv->do_set_data_bittiming) {
867
868 err = priv->do_set_data_bittiming(dev);
869 if (err)
870 return err;
871 }
872 }
873
874 return 0;
875}
876
877static size_t can_get_size(const struct net_device *dev)
878{
879 struct can_priv *priv = netdev_priv(dev);
880 size_t size = 0;
881
882 if (priv->bittiming.bitrate)
883 size += nla_total_size(sizeof(struct can_bittiming));
884 if (priv->bittiming_const)
885 size += nla_total_size(sizeof(struct can_bittiming_const));
886 size += nla_total_size(sizeof(struct can_clock));
887 size += nla_total_size(sizeof(u32));
888 size += nla_total_size(sizeof(struct can_ctrlmode));
889 size += nla_total_size(sizeof(u32));
890 if (priv->do_get_berr_counter)
891 size += nla_total_size(sizeof(struct can_berr_counter));
892 if (priv->data_bittiming.bitrate)
893 size += nla_total_size(sizeof(struct can_bittiming));
894 if (priv->data_bittiming_const)
895 size += nla_total_size(sizeof(struct can_bittiming_const));
896
897 return size;
898}
899
900static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
901{
902 struct can_priv *priv = netdev_priv(dev);
903 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
904 struct can_berr_counter bec;
905 enum can_state state = priv->state;
906
907 if (priv->do_get_state)
908 priv->do_get_state(dev, &state);
909
910 if ((priv->bittiming.bitrate &&
911 nla_put(skb, IFLA_CAN_BITTIMING,
912 sizeof(priv->bittiming), &priv->bittiming)) ||
913
914 (priv->bittiming_const &&
915 nla_put(skb, IFLA_CAN_BITTIMING_CONST,
916 sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
917
918 nla_put(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock) ||
919 nla_put_u32(skb, IFLA_CAN_STATE, state) ||
920 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
921 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
922
923 (priv->do_get_berr_counter &&
924 !priv->do_get_berr_counter(dev, &bec) &&
925 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) ||
926
927 (priv->data_bittiming.bitrate &&
928 nla_put(skb, IFLA_CAN_DATA_BITTIMING,
929 sizeof(priv->data_bittiming), &priv->data_bittiming)) ||
930
931 (priv->data_bittiming_const &&
932 nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST,
933 sizeof(*priv->data_bittiming_const),
934 priv->data_bittiming_const)))
935 return -EMSGSIZE;
936
937 return 0;
938}
939
940static size_t can_get_xstats_size(const struct net_device *dev)
941{
942 return sizeof(struct can_device_stats);
943}
944
945static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
946{
947 struct can_priv *priv = netdev_priv(dev);
948
949 if (nla_put(skb, IFLA_INFO_XSTATS,
950 sizeof(priv->can_stats), &priv->can_stats))
951 goto nla_put_failure;
952 return 0;
953
954nla_put_failure:
955 return -EMSGSIZE;
956}
957
958static int can_newlink(struct net *src_net, struct net_device *dev,
959 struct nlattr *tb[], struct nlattr *data[])
960{
961 return -EOPNOTSUPP;
962}
963
964static struct rtnl_link_ops can_link_ops __read_mostly = {
965 .kind = "can",
966 .maxtype = IFLA_CAN_MAX,
967 .policy = can_policy,
968 .setup = can_setup,
969 .newlink = can_newlink,
970 .changelink = can_changelink,
971 .get_size = can_get_size,
972 .fill_info = can_fill_info,
973 .get_xstats_size = can_get_xstats_size,
974 .fill_xstats = can_fill_xstats,
975};
976
977
978
979
980int register_candev(struct net_device *dev)
981{
982 dev->rtnl_link_ops = &can_link_ops;
983 return register_netdev(dev);
984}
985EXPORT_SYMBOL_GPL(register_candev);
986
987
988
989
990void unregister_candev(struct net_device *dev)
991{
992 unregister_netdev(dev);
993}
994EXPORT_SYMBOL_GPL(unregister_candev);
995
996
997
998
999
1000struct can_priv *safe_candev_priv(struct net_device *dev)
1001{
1002 if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops))
1003 return NULL;
1004
1005 return netdev_priv(dev);
1006}
1007EXPORT_SYMBOL_GPL(safe_candev_priv);
1008
1009static __init int can_dev_init(void)
1010{
1011 int err;
1012
1013 can_led_notifier_init();
1014
1015 err = rtnl_link_register(&can_link_ops);
1016 if (!err)
1017 printk(KERN_INFO MOD_DESC "\n");
1018
1019 return err;
1020}
1021module_init(can_dev_init);
1022
1023static __exit void can_dev_exit(void)
1024{
1025 rtnl_link_unregister(&can_link_ops);
1026
1027 can_led_notifier_exit();
1028}
1029module_exit(can_dev_exit);
1030
1031MODULE_ALIAS_RTNL_LINK("can");
1032