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can: Fix FSF address in file headers
[deliverable/linux.git] / drivers / net / can / dev.c
CommitLineData
39549eef
WG		 1/*
2 * Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
3 * Copyright (C) 2006 Andrey Volkov, Varma Electronics
4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
05780d98 16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
39549eef
WG		 17 */
18
19#include <linux/module.h>
20#include <linux/kernel.h>
5a0e3ad6 21#include <linux/slab.h>
39549eef
WG		 22#include <linux/netdevice.h>
23#include <linux/if_arp.h>
24#include <linux/can.h>
25#include <linux/can/dev.h>
156c2bb9 26#include <linux/can/skb.h>
39549eef 27#include <linux/can/netlink.h>
a1ef7bd9 28#include <linux/can/led.h>
39549eef
WG		 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
1e0625fa
OH		 37/* CAN DLC to real data length conversion helpers */
38
39static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
40 8, 12, 16, 20, 24, 32, 48, 64};
41
42/* get data length from can_dlc with sanitized can_dlc */
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, /* 0 - 8 */
50 9, 9, 9, 9, /* 9 - 12 */
51 10, 10, 10, 10, /* 13 - 16 */
52 11, 11, 11, 11, /* 17 - 20 */
53 12, 12, 12, 12, /* 21 - 24 */
54 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
55 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
56 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
57 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
58 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */
59
60/* map the sanitized data length to an appropriate data length code */
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
39549eef
WG		 70#ifdef CONFIG_CAN_CALC_BITTIMING
71#define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
72
73/*
74 * Bit-timing calculation derived from:
75 *
76 * Code based on LinCAN sources and H8S2638 project
77 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
78 * Copyright 2005 Stanislav Marek
79 * email: pisa@cmp.felk.cvut.cz
80 *
81 * Calculates proper bit-timing parameters for a specified bit-rate
82 * and sample-point, which can then be used to set the bit-timing
83 * registers of the CAN controller. You can find more information
84 * in the header file linux/can/netlink.h.
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{
104 struct can_priv *priv = netdev_priv(dev);
105 const struct can_bittiming_const *btc = priv->bittiming_const;
106 long rate, best_rate = 0;
107 long best_error = 1000000000, error = 0;
108 int best_tseg = 0, best_brp = 0, brp = 0;
109 int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0;
110 int spt_error = 1000, spt = 0, sampl_pt;
111 u64 v64;
112
113 if (!priv->bittiming_const)
114 return -ENOTSUPP;
115
116 /* Use CIA recommended sample points */
117 if (bt->sample_point) {
118 sampl_pt = bt->sample_point;
119 } else {
120 if (bt->bitrate > 800000)
121 sampl_pt = 750;
122 else if (bt->bitrate > 500000)
123 sampl_pt = 800;
124 else
125 sampl_pt = 875;
126 }
127
128 /* tseg even = round down, odd = round up */
129 for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1;
130 tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) {
131 tsegall = 1 + tseg / 2;
132 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
133 brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2;
134 /* chose brp step which is possible in system */
135 brp = (brp / btc->brp_inc) * btc->brp_inc;
136 if ((brp < btc->brp_min) || (brp > btc->brp_max))
137 continue;
138 rate = priv->clock.freq / (brp * tsegall);
139 error = bt->bitrate - rate;
140 /* tseg brp biterror */
141 if (error < 0)
142 error = -error;
143 if (error > best_error)
144 continue;
145 best_error = error;
146 if (error == 0) {
147 spt = can_update_spt(btc, sampl_pt, tseg / 2,
148 &tseg1, &tseg2);
149 error = sampl_pt - spt;
150 if (error < 0)
151 error = -error;
152 if (error > spt_error)
153 continue;
154 spt_error = error;
155 }
156 best_tseg = tseg / 2;
157 best_brp = brp;
158 best_rate = rate;
159 if (error == 0)
160 break;
161 }
162
163 if (best_error) {
164 /* Error in one-tenth of a percent */
165 error = (best_error * 1000) / bt->bitrate;
166 if (error > CAN_CALC_MAX_ERROR) {
aabdfd6a
WG		 167 netdev_err(dev,
168 "bitrate error %ld.%ld%% too high\n",
169 error / 10, error % 10);
39549eef
WG		 170 return -EDOM;
171 } else {
aabdfd6a
WG		 172 netdev_warn(dev, "bitrate error %ld.%ld%%\n",
173 error / 10, error % 10);
39549eef
WG		 174 }
175 }
176
177 /* real sample point */
178 bt->sample_point = can_update_spt(btc, sampl_pt, best_tseg,
179 &tseg1, &tseg2);
180
181 v64 = (u64)best_brp * 1000000000UL;
182 do_div(v64, priv->clock.freq);
183 bt->tq = (u32)v64;
184 bt->prop_seg = tseg1 / 2;
185 bt->phase_seg1 = tseg1 - bt->prop_seg;
186 bt->phase_seg2 = tseg2;
2e114374
OH		 187
188 /* check for sjw user settings */
189 if (!bt->sjw || !btc->sjw_max)
190 bt->sjw = 1;
191 else {
192 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
193 if (bt->sjw > btc->sjw_max)
194 bt->sjw = btc->sjw_max;
195 /* bt->sjw must not be higher than tseg2 */
196 if (tseg2 < bt->sjw)
197 bt->sjw = tseg2;
198 }
199
39549eef
WG		 200 bt->brp = best_brp;
201 /* real bit-rate */
202 bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1));
203
204 return 0;
205}
206#else /* !CONFIG_CAN_CALC_BITTIMING */
207static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt)
208{
aabdfd6a 209 netdev_err(dev, "bit-timing calculation not available\n");
39549eef
WG		 210 return -EINVAL;
211}
212#endif /* CONFIG_CAN_CALC_BITTIMING */
213
214/*
215 * Checks the validity of the specified bit-timing parameters prop_seg,
216 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
217 * prescaler value brp. You can find more information in the header
218 * file linux/can/netlink.h.
219 */
220static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt)
221{
222 struct can_priv *priv = netdev_priv(dev);
223 const struct can_bittiming_const *btc = priv->bittiming_const;
224 int tseg1, alltseg;
225 u64 brp64;
226
227 if (!priv->bittiming_const)
228 return -ENOTSUPP;
229
230 tseg1 = bt->prop_seg + bt->phase_seg1;
231 if (!bt->sjw)
232 bt->sjw = 1;
233 if (bt->sjw > btc->sjw_max ||
234 tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max ||
235 bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max)
236 return -ERANGE;
237
238 brp64 = (u64)priv->clock.freq * (u64)bt->tq;
239 if (btc->brp_inc > 1)
240 do_div(brp64, btc->brp_inc);
241 brp64 += 500000000UL - 1;
242 do_div(brp64, 1000000000UL); /* the practicable BRP */
243 if (btc->brp_inc > 1)
244 brp64 *= btc->brp_inc;
245 bt->brp = (u32)brp64;
246
247 if (bt->brp < btc->brp_min || bt->brp > btc->brp_max)
248 return -EINVAL;
249
250 alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1;
251 bt->bitrate = priv->clock.freq / (bt->brp * alltseg);
252 bt->sample_point = ((tseg1 + 1) * 1000) / alltseg;
253
254 return 0;
255}
256
61463a30 257static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt)
39549eef
WG		 258{
259 struct can_priv *priv = netdev_priv(dev);
260 int err;
261
262 /* Check if the CAN device has bit-timing parameters */
263 if (priv->bittiming_const) {
264
265 /* Non-expert mode? Check if the bitrate has been pre-defined */
266 if (!bt->tq)
267 /* Determine bit-timing parameters */
268 err = can_calc_bittiming(dev, bt);
269 else
270 /* Check bit-timing params and calculate proper brp */
271 err = can_fixup_bittiming(dev, bt);
272 if (err)
273 return err;
274 }
275
276 return 0;
277}
278
279/*
280 * Local echo of CAN messages
281 *
282 * CAN network devices *should* support a local echo functionality
283 * (see Documentation/networking/can.txt). To test the handling of CAN
284 * interfaces that do not support the local echo both driver types are
285 * implemented. In the case that the driver does not support the echo
286 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
287 * to perform the echo as a fallback solution.
288 */
289static void can_flush_echo_skb(struct net_device *dev)
290{
291 struct can_priv *priv = netdev_priv(dev);
292 struct net_device_stats *stats = &dev->stats;
293 int i;
294
a6e4bc53 295 for (i = 0; i < priv->echo_skb_max; i++) {
39549eef
WG		 296 if (priv->echo_skb[i]) {
297 kfree_skb(priv->echo_skb[i]);
298 priv->echo_skb[i] = NULL;
299 stats->tx_dropped++;
300 stats->tx_aborted_errors++;
301 }
302 }
303}
304
305/*
306 * Put the skb on the stack to be looped backed locally lateron
307 *
308 * The function is typically called in the start_xmit function
309 * of the device driver. The driver must protect access to
310 * priv->echo_skb, if necessary.
311 */
a6e4bc53
WG		 312void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
313 unsigned int idx)
39549eef
WG		 314{
315 struct can_priv *priv = netdev_priv(dev);
316
a6e4bc53
WG		 317 BUG_ON(idx >= priv->echo_skb_max);
318
39549eef
WG		 319 /* check flag whether this packet has to be looped back */
320 if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK) {
321 kfree_skb(skb);
322 return;
323 }
324
325 if (!priv->echo_skb[idx]) {
326 struct sock *srcsk = skb->sk;
327
328 if (atomic_read(&skb->users) != 1) {
329 struct sk_buff *old_skb = skb;
330
331 skb = skb_clone(old_skb, GFP_ATOMIC);
332 kfree_skb(old_skb);
333 if (!skb)
334 return;
335 } else
336 skb_orphan(skb);
337
338 skb->sk = srcsk;
339
340 /* make settings for echo to reduce code in irq context */
341 skb->protocol = htons(ETH_P_CAN);
342 skb->pkt_type = PACKET_BROADCAST;
343 skb->ip_summed = CHECKSUM_UNNECESSARY;
344 skb->dev = dev;
345
346 /* save this skb for tx interrupt echo handling */
347 priv->echo_skb[idx] = skb;
348 } else {
349 /* locking problem with netif_stop_queue() ?? */
aabdfd6a 350 netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__);
39549eef
WG		 351 kfree_skb(skb);
352 }
353}
354EXPORT_SYMBOL_GPL(can_put_echo_skb);
355
356/*
357 * Get the skb from the stack and loop it back locally
358 *
359 * The function is typically called when the TX done interrupt
360 * is handled in the device driver. The driver must protect
361 * access to priv->echo_skb, if necessary.
362 */
cf5046b3 363unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx)
39549eef
WG		 364{
365 struct can_priv *priv = netdev_priv(dev);
366
a6e4bc53
WG		 367 BUG_ON(idx >= priv->echo_skb_max);
368
39e3ab6f 369 if (priv->echo_skb[idx]) {
cf5046b3
MKB		 370 struct sk_buff *skb = priv->echo_skb[idx];
371 struct can_frame *cf = (struct can_frame *)skb->data;
372 u8 dlc = cf->can_dlc;
373
39549eef
WG		 374 netif_rx(priv->echo_skb[idx]);
375 priv->echo_skb[idx] = NULL;
cf5046b3
MKB		 376
377 return dlc;
39549eef 378 }
cf5046b3
MKB		 379
380 return 0;
39549eef
WG		 381}
382EXPORT_SYMBOL_GPL(can_get_echo_skb);
383
39e3ab6f
WG		 384/*
385 * Remove the skb from the stack and free it.
386 *
387 * The function is typically called when TX failed.
388 */
a6e4bc53 389void can_free_echo_skb(struct net_device *dev, unsigned int idx)
39e3ab6f
WG		 390{
391 struct can_priv *priv = netdev_priv(dev);
392
a6e4bc53
WG		 393 BUG_ON(idx >= priv->echo_skb_max);
394
39e3ab6f
WG		 395 if (priv->echo_skb[idx]) {
396 kfree_skb(priv->echo_skb[idx]);
397 priv->echo_skb[idx] = NULL;
398 }
399}
400EXPORT_SYMBOL_GPL(can_free_echo_skb);
401
39549eef
WG		 402/*
403 * CAN device restart for bus-off recovery
404 */
77fc95a3 405static void can_restart(unsigned long data)
39549eef
WG		 406{
407 struct net_device *dev = (struct net_device *)data;
408 struct can_priv *priv = netdev_priv(dev);
409 struct net_device_stats *stats = &dev->stats;
410 struct sk_buff *skb;
411 struct can_frame *cf;
412 int err;
413
414 BUG_ON(netif_carrier_ok(dev));
415
416 /*
417 * No synchronization needed because the device is bus-off and
418 * no messages can come in or go out.
419 */
420 can_flush_echo_skb(dev);
421
422 /* send restart message upstream */
7b6856a0 423 skb = alloc_can_err_skb(dev, &cf);
39549eef
WG		 424 if (skb == NULL) {
425 err = -ENOMEM;
b3d0df7c 426 goto restart;
39549eef 427 }
7b6856a0 428 cf->can_id |= CAN_ERR_RESTARTED;
39549eef
WG		 429
430 netif_rx(skb);
431
39549eef
WG		 432 stats->rx_packets++;
433 stats->rx_bytes += cf->can_dlc;
434
b3d0df7c 435restart:
aabdfd6a 436 netdev_dbg(dev, "restarted\n");
39549eef
WG		 437 priv->can_stats.restarts++;
438
439 /* Now restart the device */
440 err = priv->do_set_mode(dev, CAN_MODE_START);
441
39549eef
WG		 442 netif_carrier_on(dev);
443 if (err)
aabdfd6a 444 netdev_err(dev, "Error %d during restart", err);
39549eef
WG		 445}
446
447int can_restart_now(struct net_device *dev)
448{
449 struct can_priv *priv = netdev_priv(dev);
450
451 /*
452 * A manual restart is only permitted if automatic restart is
453 * disabled and the device is in the bus-off state
454 */
455 if (priv->restart_ms)
456 return -EINVAL;
457 if (priv->state != CAN_STATE_BUS_OFF)
458 return -EBUSY;
459
460 /* Runs as soon as possible in the timer context */
461 mod_timer(&priv->restart_timer, jiffies);
462
463 return 0;
464}
465
466/*
467 * CAN bus-off
468 *
469 * This functions should be called when the device goes bus-off to
470 * tell the netif layer that no more packets can be sent or received.
471 * If enabled, a timer is started to trigger bus-off recovery.
472 */
473void can_bus_off(struct net_device *dev)
474{
475 struct can_priv *priv = netdev_priv(dev);
476
aabdfd6a 477 netdev_dbg(dev, "bus-off\n");
39549eef
WG		 478
479 netif_carrier_off(dev);
480 priv->can_stats.bus_off++;
481
482 if (priv->restart_ms)
483 mod_timer(&priv->restart_timer,
484 jiffies + (priv->restart_ms * HZ) / 1000);
485}
486EXPORT_SYMBOL_GPL(can_bus_off);
487
488static void can_setup(struct net_device *dev)
489{
490 dev->type = ARPHRD_CAN;
1e0625fa 491 dev->mtu = CAN_MTU;
39549eef
WG		 492 dev->hard_header_len = 0;
493 dev->addr_len = 0;
494 dev->tx_queue_len = 10;
495
496 /* New-style flags. */
497 dev->flags = IFF_NOARP;
34324dc2 498 dev->features = NETIF_F_HW_CSUM;
39549eef
WG		 499}
500
7b6856a0
WG		 501struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
502{
503 struct sk_buff *skb;
504
156c2bb9
OH		 505 skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) +
506 sizeof(struct can_frame));
7b6856a0
WG		 507 if (unlikely(!skb))
508 return NULL;
509
510 skb->protocol = htons(ETH_P_CAN);
511 skb->pkt_type = PACKET_BROADCAST;
512 skb->ip_summed = CHECKSUM_UNNECESSARY;
156c2bb9 513
2bf3440d
OH		 514 can_skb_reserve(skb);
515 can_skb_prv(skb)->ifindex = dev->ifindex;
156c2bb9 516
7b6856a0
WG		 517 *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
518 memset(*cf, 0, sizeof(struct can_frame));
519
520 return skb;
521}
522EXPORT_SYMBOL_GPL(alloc_can_skb);
523
524struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
525{
526 struct sk_buff *skb;
527
528 skb = alloc_can_skb(dev, cf);
529 if (unlikely(!skb))
530 return NULL;
531
532 (*cf)->can_id = CAN_ERR_FLAG;
533 (*cf)->can_dlc = CAN_ERR_DLC;
534
535 return skb;
536}
537EXPORT_SYMBOL_GPL(alloc_can_err_skb);
538
39549eef
WG		 539/*
540 * Allocate and setup space for the CAN network device
541 */
a6e4bc53 542struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max)
39549eef
WG		 543{
544 struct net_device *dev;
545 struct can_priv *priv;
a6e4bc53 546 int size;
39549eef 547
a6e4bc53
WG		 548 if (echo_skb_max)
549 size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
550 echo_skb_max * sizeof(struct sk_buff *);
551 else
552 size = sizeof_priv;
553
554 dev = alloc_netdev(size, "can%d", can_setup);
39549eef
WG		 555 if (!dev)
556 return NULL;
557
558 priv = netdev_priv(dev);
559
a6e4bc53
WG		 560 if (echo_skb_max) {
561 priv->echo_skb_max = echo_skb_max;
562 priv->echo_skb = (void *)priv +
563 ALIGN(sizeof_priv, sizeof(struct sk_buff *));
564 }
565
39549eef
WG		 566 priv->state = CAN_STATE_STOPPED;
567
568 init_timer(&priv->restart_timer);
569
570 return dev;
571}
572EXPORT_SYMBOL_GPL(alloc_candev);
573
574/*
575 * Free space of the CAN network device
576 */
577void free_candev(struct net_device *dev)
578{
579 free_netdev(dev);
580}
581EXPORT_SYMBOL_GPL(free_candev);
582
583/*
584 * Common open function when the device gets opened.
585 *
586 * This function should be called in the open function of the device
587 * driver.
588 */
589int open_candev(struct net_device *dev)
590{
591 struct can_priv *priv = netdev_priv(dev);
592
593 if (!priv->bittiming.tq && !priv->bittiming.bitrate) {
aabdfd6a 594 netdev_err(dev, "bit-timing not yet defined\n");
39549eef
WG		 595 return -EINVAL;
596 }
597
1b0d9224
WG		 598 /* Switch carrier on if device was stopped while in bus-off state */
599 if (!netif_carrier_ok(dev))
600 netif_carrier_on(dev);
601
39549eef
WG		 602 setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev);
603
604 return 0;
605}
128ced8f 606EXPORT_SYMBOL_GPL(open_candev);
39549eef
WG		 607
608/*
609 * Common close function for cleanup before the device gets closed.
610 *
611 * This function should be called in the close function of the device
612 * driver.
613 */
614void close_candev(struct net_device *dev)
615{
616 struct can_priv *priv = netdev_priv(dev);
617
ab48b03e 618 del_timer_sync(&priv->restart_timer);
39549eef
WG		 619 can_flush_echo_skb(dev);
620}
621EXPORT_SYMBOL_GPL(close_candev);
622
623/*
624 * CAN netlink interface
625 */
626static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
627 [IFLA_CAN_STATE] = { .type = NLA_U32 },
628 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
629 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
630 [IFLA_CAN_RESTART] = { .type = NLA_U32 },
631 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
632 [IFLA_CAN_BITTIMING_CONST]
633 = { .len = sizeof(struct can_bittiming_const) },
634 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
52c793f2 635 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
39549eef
WG		 636};
637
638static int can_changelink(struct net_device *dev,
639 struct nlattr *tb[], struct nlattr *data[])
640{
641 struct can_priv *priv = netdev_priv(dev);
642 int err;
643
644 /* We need synchronization with dev->stop() */
645 ASSERT_RTNL();
646
39549eef
WG		 647 if (data[IFLA_CAN_BITTIMING]) {
648 struct can_bittiming bt;
649
650 /* Do not allow changing bittiming while running */
651 if (dev->flags & IFF_UP)
652 return -EBUSY;
653 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
654 if ((!bt.bitrate && !bt.tq) || (bt.bitrate && bt.tq))
655 return -EINVAL;
656 err = can_get_bittiming(dev, &bt);
657 if (err)
658 return err;
659 memcpy(&priv->bittiming, &bt, sizeof(bt));
660
661 if (priv->do_set_bittiming) {
662 /* Finally, set the bit-timing registers */
663 err = priv->do_set_bittiming(dev);
664 if (err)
665 return err;
666 }
667 }
668
49cb5c0e
MKB		 669 if (data[IFLA_CAN_CTRLMODE]) {
670 struct can_ctrlmode *cm;
671
672 /* Do not allow changing controller mode while running */
673 if (dev->flags & IFF_UP)
674 return -EBUSY;
675 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
676 if (cm->flags & ~priv->ctrlmode_supported)
677 return -EOPNOTSUPP;
678 priv->ctrlmode &= ~cm->mask;
679 priv->ctrlmode |= cm->flags;
680 }
681
39549eef
WG		 682 if (data[IFLA_CAN_RESTART_MS]) {
683 /* Do not allow changing restart delay while running */
684 if (dev->flags & IFF_UP)
685 return -EBUSY;
686 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
687 }
688
689 if (data[IFLA_CAN_RESTART]) {
690 /* Do not allow a restart while not running */
691 if (!(dev->flags & IFF_UP))
692 return -EINVAL;
693 err = can_restart_now(dev);
694 if (err)
695 return err;
696 }
697
698 return 0;
699}
700
53a0ef86
WG		 701static size_t can_get_size(const struct net_device *dev)
702{
703 struct can_priv *priv = netdev_priv(dev);
c13c64d8
MKB		 704 size_t size = 0;
705
706 size += nla_total_size(sizeof(struct can_bittiming)); /* IFLA_CAN_BITTIMING */
707 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
fe119a05 708 size += nla_total_size(sizeof(struct can_bittiming_const));
c13c64d8
MKB		 709 size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */
710 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
711 size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */
712 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
713 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
714 size += nla_total_size(sizeof(struct can_berr_counter));
53a0ef86
WG		 715
716 return size;
717}
718
39549eef
WG		 719static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
720{
721 struct can_priv *priv = netdev_priv(dev);
722 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
52c793f2 723 struct can_berr_counter bec;
39549eef
WG		 724 enum can_state state = priv->state;
725
726 if (priv->do_get_state)
727 priv->do_get_state(dev, &state);
57a59b9e 728 if (nla_put(skb, IFLA_CAN_BITTIMING,
31e0e328 729 sizeof(priv->bittiming), &priv->bittiming) ||
57a59b9e
MKB		 730 (priv->bittiming_const &&
731 nla_put(skb, IFLA_CAN_BITTIMING_CONST,
732 sizeof(*priv->bittiming_const), priv->bittiming_const)) ||
31e0e328 733 nla_put(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock) ||
57a59b9e
MKB		 734 nla_put_u32(skb, IFLA_CAN_STATE, state) ||
735 nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) ||
736 nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) ||
31e0e328
DM		 737 (priv->do_get_berr_counter &&
738 !priv->do_get_berr_counter(dev, &bec) &&
57a59b9e
MKB		 739 nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)))
740 return -EMSGSIZE;
39549eef 741 return 0;
39549eef
WG		 742}
743
55369c0a
WG		 744static size_t can_get_xstats_size(const struct net_device *dev)
745{
746 return sizeof(struct can_device_stats);
747}
748
39549eef
WG		 749static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
750{
751 struct can_priv *priv = netdev_priv(dev);
752
31e0e328
DM		 753 if (nla_put(skb, IFLA_INFO_XSTATS,
754 sizeof(priv->can_stats), &priv->can_stats))
755 goto nla_put_failure;
39549eef
WG		 756 return 0;
757
758nla_put_failure:
759 return -EMSGSIZE;
760}
761
81adee47 762static int can_newlink(struct net *src_net, struct net_device *dev,
993e6f2f
OH		 763 struct nlattr *tb[], struct nlattr *data[])
764{
765 return -EOPNOTSUPP;
766}
767
39549eef
WG		 768static struct rtnl_link_ops can_link_ops __read_mostly = {
769 .kind = "can",
770 .maxtype = IFLA_CAN_MAX,
771 .policy = can_policy,
772 .setup = can_setup,
993e6f2f 773 .newlink = can_newlink,
39549eef 774 .changelink = can_changelink,
53a0ef86 775 .get_size = can_get_size,
39549eef 776 .fill_info = can_fill_info,
55369c0a 777 .get_xstats_size = can_get_xstats_size,
39549eef
WG		 778 .fill_xstats = can_fill_xstats,
779};
780
781/*
782 * Register the CAN network device
783 */
784int register_candev(struct net_device *dev)
785{
786 dev->rtnl_link_ops = &can_link_ops;
787 return register_netdev(dev);
788}
789EXPORT_SYMBOL_GPL(register_candev);
790
791/*
792 * Unregister the CAN network device
793 */
794void unregister_candev(struct net_device *dev)
795{
796 unregister_netdev(dev);
797}
798EXPORT_SYMBOL_GPL(unregister_candev);
799
bf03a537
KVD		 800/*
801 * Test if a network device is a candev based device
802 * and return the can_priv* if so.
803 */
804struct can_priv *safe_candev_priv(struct net_device *dev)
805{
806 if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops))
807 return NULL;
808
809 return netdev_priv(dev);
810}
811EXPORT_SYMBOL_GPL(safe_candev_priv);
812
39549eef
WG		 813static __init int can_dev_init(void)
814{
815 int err;
816
a1ef7bd9
KVD		 817 can_led_notifier_init();
818
39549eef
WG		 819 err = rtnl_link_register(&can_link_ops);
820 if (!err)
821 printk(KERN_INFO MOD_DESC "\n");
822
823 return err;
824}
825module_init(can_dev_init);
826
827static __exit void can_dev_exit(void)
828{
829 rtnl_link_unregister(&can_link_ops);
a1ef7bd9
KVD		 830
831 can_led_notifier_exit();
39549eef
WG		 832}
833module_exit(can_dev_exit);
834
835MODULE_ALIAS_RTNL_LINK("can");
Linux kernel - Deliverables
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