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Commit | Line | Data |
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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 | ||
33 | MODULE_DESCRIPTION(MOD_DESC); | |
34 | MODULE_LICENSE("GPL v2"); | |
35 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
36 | ||
1e0625fa OH |
37 | /* CAN DLC to real data length conversion helpers */ |
38 | ||
39 | static 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 */ | |
43 | u8 can_dlc2len(u8 can_dlc) | |
44 | { | |
45 | return dlc2len[can_dlc & 0x0F]; | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(can_dlc2len); | |
48 | ||
49 | static 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 */ | |
61 | u8 can_len2dlc(u8 len) | |
62 | { | |
63 | if (unlikely(len > 64)) | |
64 | return 0xF; | |
65 | ||
66 | return len2dlc[len]; | |
67 | } | |
68 | EXPORT_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 | */ | |
86 | static 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 | ||
102 | static 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 */ | |
207 | static 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 | */ | |
220 | static 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 | 257 | static 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 | */ | |
289 | static 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 |
312 | void 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 | } | |
354 | EXPORT_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 | 363 | unsigned 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 | } |
382 | EXPORT_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 | 389 | void 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 | } | |
400 | EXPORT_SYMBOL_GPL(can_free_echo_skb); | |
401 | ||
39549eef WG |
402 | /* |
403 | * CAN device restart for bus-off recovery | |
404 | */ | |
77fc95a3 | 405 | static 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 | 435 | restart: |
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 | ||
447 | int 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 | */ | |
473 | void 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 | } | |
486 | EXPORT_SYMBOL_GPL(can_bus_off); | |
487 | ||
488 | static 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 |
501 | struct 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 | } | |
522 | EXPORT_SYMBOL_GPL(alloc_can_skb); | |
523 | ||
524 | struct 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 | } | |
537 | EXPORT_SYMBOL_GPL(alloc_can_err_skb); | |
538 | ||
39549eef WG |
539 | /* |
540 | * Allocate and setup space for the CAN network device | |
541 | */ | |
a6e4bc53 | 542 | struct 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 | } | |
572 | EXPORT_SYMBOL_GPL(alloc_candev); | |
573 | ||
574 | /* | |
575 | * Free space of the CAN network device | |
576 | */ | |
577 | void free_candev(struct net_device *dev) | |
578 | { | |
579 | free_netdev(dev); | |
580 | } | |
581 | EXPORT_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 | */ | |
589 | int 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 | 606 | EXPORT_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 | */ | |
614 | void 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 | } | |
621 | EXPORT_SYMBOL_GPL(close_candev); | |
622 | ||
623 | /* | |
624 | * CAN netlink interface | |
625 | */ | |
626 | static 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 | ||
638 | static 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 |
701 | static 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 |
719 | static 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 |
744 | static size_t can_get_xstats_size(const struct net_device *dev) |
745 | { | |
746 | return sizeof(struct can_device_stats); | |
747 | } | |
748 | ||
39549eef WG |
749 | static 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 | ||
758 | nla_put_failure: | |
759 | return -EMSGSIZE; | |
760 | } | |
761 | ||
81adee47 | 762 | static 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 |
768 | static 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 | */ | |
784 | int register_candev(struct net_device *dev) | |
785 | { | |
786 | dev->rtnl_link_ops = &can_link_ops; | |
787 | return register_netdev(dev); | |
788 | } | |
789 | EXPORT_SYMBOL_GPL(register_candev); | |
790 | ||
791 | /* | |
792 | * Unregister the CAN network device | |
793 | */ | |
794 | void unregister_candev(struct net_device *dev) | |
795 | { | |
796 | unregister_netdev(dev); | |
797 | } | |
798 | EXPORT_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 | */ | |
804 | struct 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 | } | |
811 | EXPORT_SYMBOL_GPL(safe_candev_priv); | |
812 | ||
39549eef WG |
813 | static __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 | } | |
825 | module_init(can_dev_init); | |
826 | ||
827 | static __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 | } |
833 | module_exit(can_dev_exit); | |
834 | ||
835 | MODULE_ALIAS_RTNL_LINK("can"); |