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 | ||
08da7da4 OH |
102 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
103 | const struct can_bittiming_const *btc) | |
39549eef WG |
104 | { |
105 | struct can_priv *priv = netdev_priv(dev); | |
39549eef WG |
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; | |
b25a4372 | 110 | long rate; |
39549eef WG |
111 | u64 v64; |
112 | ||
67b5909e | 113 | /* Use CiA recommended sample points */ |
39549eef WG |
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 | /* tseg even = round down, odd = round up */ | |
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 | /* Compute all possible tseg choices (tseg=tseg1+tseg2) */ | |
130 | brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2; | |
131 | /* chose brp step which is possible in system */ | |
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 | /* tseg brp biterror */ | |
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; | |
39549eef WG |
155 | if (error == 0) |
156 | break; | |
157 | } | |
158 | ||
159 | if (best_error) { | |
160 | /* Error in one-tenth of a percent */ | |
161 | error = (best_error * 1000) / bt->bitrate; | |
162 | if (error > CAN_CALC_MAX_ERROR) { | |
aabdfd6a WG |
163 | netdev_err(dev, |
164 | "bitrate error %ld.%ld%% too high\n", | |
165 | error / 10, error % 10); | |
39549eef WG |
166 | return -EDOM; |
167 | } else { | |
aabdfd6a WG |
168 | netdev_warn(dev, "bitrate error %ld.%ld%%\n", |
169 | error / 10, error % 10); | |
39549eef WG |
170 | } |
171 | } | |
172 | ||
173 | /* real sample point */ | |
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; | |
2e114374 OH |
183 | |
184 | /* check for sjw user settings */ | |
185 | if (!bt->sjw || !btc->sjw_max) | |
186 | bt->sjw = 1; | |
187 | else { | |
188 | /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */ | |
189 | if (bt->sjw > btc->sjw_max) | |
190 | bt->sjw = btc->sjw_max; | |
191 | /* bt->sjw must not be higher than tseg2 */ | |
192 | if (tseg2 < bt->sjw) | |
193 | bt->sjw = tseg2; | |
194 | } | |
195 | ||
39549eef WG |
196 | bt->brp = best_brp; |
197 | /* real bit-rate */ | |
198 | bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1)); | |
199 | ||
200 | return 0; | |
201 | } | |
202 | #else /* !CONFIG_CAN_CALC_BITTIMING */ | |
08da7da4 OH |
203 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
204 | const struct can_bittiming_const *btc) | |
39549eef | 205 | { |
aabdfd6a | 206 | netdev_err(dev, "bit-timing calculation not available\n"); |
39549eef WG |
207 | return -EINVAL; |
208 | } | |
209 | #endif /* CONFIG_CAN_CALC_BITTIMING */ | |
210 | ||
211 | /* | |
212 | * Checks the validity of the specified bit-timing parameters prop_seg, | |
213 | * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate | |
214 | * prescaler value brp. You can find more information in the header | |
215 | * file linux/can/netlink.h. | |
216 | */ | |
08da7da4 OH |
217 | static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt, |
218 | const struct can_bittiming_const *btc) | |
39549eef WG |
219 | { |
220 | struct can_priv *priv = netdev_priv(dev); | |
39549eef WG |
221 | int tseg1, alltseg; |
222 | u64 brp64; | |
223 | ||
39549eef WG |
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); /* the practicable BRP */ | |
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 | ||
08da7da4 OH |
251 | static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, |
252 | const struct can_bittiming_const *btc) | |
39549eef | 253 | { |
39549eef WG |
254 | int err; |
255 | ||
256 | /* Check if the CAN device has bit-timing parameters */ | |
08da7da4 | 257 | if (!btc) |
d4824432 | 258 | return -EOPNOTSUPP; |
39549eef | 259 | |
d5298dff OH |
260 | /* |
261 | * Depending on the given can_bittiming parameter structure the CAN | |
262 | * timing parameters are calculated based on the provided bitrate OR | |
263 | * alternatively the CAN timing parameters (tq, prop_seg, etc.) are | |
264 | * provided directly which are then checked and fixed up. | |
265 | */ | |
266 | if (!bt->tq && bt->bitrate) | |
08da7da4 | 267 | err = can_calc_bittiming(dev, bt, btc); |
d5298dff | 268 | else if (bt->tq && !bt->bitrate) |
08da7da4 | 269 | err = can_fixup_bittiming(dev, bt, btc); |
d5298dff OH |
270 | else |
271 | err = -EINVAL; | |
39549eef | 272 | |
d5298dff | 273 | return err; |
39549eef WG |
274 | } |
275 | ||
bac78aab AY |
276 | static 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: | |
be38a6f9 AY |
292 | priv->can_stats.bus_off++; |
293 | break; | |
bac78aab AY |
294 | default: |
295 | break; | |
5b5ba2af | 296 | } |
bac78aab AY |
297 | } |
298 | ||
299 | static 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 | ||
313 | static 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 | ||
327 | void 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 | } | |
354 | EXPORT_SYMBOL_GPL(can_change_state); | |
355 | ||
39549eef WG |
356 | /* |
357 | * Local echo of CAN messages | |
358 | * | |
359 | * CAN network devices *should* support a local echo functionality | |
360 | * (see Documentation/networking/can.txt). To test the handling of CAN | |
361 | * interfaces that do not support the local echo both driver types are | |
362 | * implemented. In the case that the driver does not support the echo | |
363 | * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core | |
364 | * to perform the echo as a fallback solution. | |
365 | */ | |
366 | static 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 | ||
a6e4bc53 | 372 | for (i = 0; i < priv->echo_skb_max; i++) { |
39549eef WG |
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 | * Put the skb on the stack to be looped backed locally lateron | |
384 | * | |
385 | * The function is typically called in the start_xmit function | |
386 | * of the device driver. The driver must protect access to | |
387 | * priv->echo_skb, if necessary. | |
388 | */ | |
a6e4bc53 WG |
389 | void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, |
390 | unsigned int idx) | |
39549eef WG |
391 | { |
392 | struct can_priv *priv = netdev_priv(dev); | |
393 | ||
a6e4bc53 WG |
394 | BUG_ON(idx >= priv->echo_skb_max); |
395 | ||
39549eef | 396 | /* check flag whether this packet has to be looped back */ |
a94bc9c4 OH |
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))) { | |
39549eef WG |
400 | kfree_skb(skb); |
401 | return; | |
402 | } | |
403 | ||
404 | if (!priv->echo_skb[idx]) { | |
39549eef | 405 | |
0ae89beb OH |
406 | skb = can_create_echo_skb(skb); |
407 | if (!skb) | |
408 | return; | |
39549eef WG |
409 | |
410 | /* make settings for echo to reduce code in irq context */ | |
39549eef WG |
411 | skb->pkt_type = PACKET_BROADCAST; |
412 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
413 | skb->dev = dev; | |
414 | ||
415 | /* save this skb for tx interrupt echo handling */ | |
416 | priv->echo_skb[idx] = skb; | |
417 | } else { | |
418 | /* locking problem with netif_stop_queue() ?? */ | |
aabdfd6a | 419 | netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__); |
39549eef WG |
420 | kfree_skb(skb); |
421 | } | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(can_put_echo_skb); | |
424 | ||
425 | /* | |
426 | * Get the skb from the stack and loop it back locally | |
427 | * | |
428 | * The function is typically called when the TX done interrupt | |
429 | * is handled in the device driver. The driver must protect | |
430 | * access to priv->echo_skb, if necessary. | |
431 | */ | |
cf5046b3 | 432 | unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) |
39549eef WG |
433 | { |
434 | struct can_priv *priv = netdev_priv(dev); | |
435 | ||
a6e4bc53 WG |
436 | BUG_ON(idx >= priv->echo_skb_max); |
437 | ||
39e3ab6f | 438 | if (priv->echo_skb[idx]) { |
cf5046b3 MKB |
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 | ||
39549eef WG |
443 | netif_rx(priv->echo_skb[idx]); |
444 | priv->echo_skb[idx] = NULL; | |
cf5046b3 MKB |
445 | |
446 | return dlc; | |
39549eef | 447 | } |
cf5046b3 MKB |
448 | |
449 | return 0; | |
39549eef WG |
450 | } |
451 | EXPORT_SYMBOL_GPL(can_get_echo_skb); | |
452 | ||
39e3ab6f WG |
453 | /* |
454 | * Remove the skb from the stack and free it. | |
455 | * | |
456 | * The function is typically called when TX failed. | |
457 | */ | |
a6e4bc53 | 458 | void can_free_echo_skb(struct net_device *dev, unsigned int idx) |
39e3ab6f WG |
459 | { |
460 | struct can_priv *priv = netdev_priv(dev); | |
461 | ||
a6e4bc53 WG |
462 | BUG_ON(idx >= priv->echo_skb_max); |
463 | ||
39e3ab6f | 464 | if (priv->echo_skb[idx]) { |
5247a589 | 465 | dev_kfree_skb_any(priv->echo_skb[idx]); |
39e3ab6f WG |
466 | priv->echo_skb[idx] = NULL; |
467 | } | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(can_free_echo_skb); | |
470 | ||
39549eef WG |
471 | /* |
472 | * CAN device restart for bus-off recovery | |
473 | */ | |
77fc95a3 | 474 | static void can_restart(unsigned long data) |
39549eef WG |
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 | * No synchronization needed because the device is bus-off and | |
487 | * no messages can come in or go out. | |
488 | */ | |
489 | can_flush_echo_skb(dev); | |
490 | ||
491 | /* send restart message upstream */ | |
7b6856a0 | 492 | skb = alloc_can_err_skb(dev, &cf); |
39549eef WG |
493 | if (skb == NULL) { |
494 | err = -ENOMEM; | |
b3d0df7c | 495 | goto restart; |
39549eef | 496 | } |
7b6856a0 | 497 | cf->can_id |= CAN_ERR_RESTARTED; |
39549eef WG |
498 | |
499 | netif_rx(skb); | |
500 | ||
39549eef WG |
501 | stats->rx_packets++; |
502 | stats->rx_bytes += cf->can_dlc; | |
503 | ||
b3d0df7c | 504 | restart: |
aabdfd6a | 505 | netdev_dbg(dev, "restarted\n"); |
39549eef WG |
506 | priv->can_stats.restarts++; |
507 | ||
508 | /* Now restart the device */ | |
509 | err = priv->do_set_mode(dev, CAN_MODE_START); | |
510 | ||
39549eef WG |
511 | netif_carrier_on(dev); |
512 | if (err) | |
aabdfd6a | 513 | netdev_err(dev, "Error %d during restart", err); |
39549eef WG |
514 | } |
515 | ||
516 | int can_restart_now(struct net_device *dev) | |
517 | { | |
518 | struct can_priv *priv = netdev_priv(dev); | |
519 | ||
520 | /* | |
521 | * A manual restart is only permitted if automatic restart is | |
522 | * disabled and the device is in the bus-off state | |
523 | */ | |
524 | if (priv->restart_ms) | |
525 | return -EINVAL; | |
526 | if (priv->state != CAN_STATE_BUS_OFF) | |
527 | return -EBUSY; | |
528 | ||
529 | /* Runs as soon as possible in the timer context */ | |
530 | mod_timer(&priv->restart_timer, jiffies); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | /* | |
536 | * CAN bus-off | |
537 | * | |
538 | * This functions should be called when the device goes bus-off to | |
539 | * tell the netif layer that no more packets can be sent or received. | |
540 | * If enabled, a timer is started to trigger bus-off recovery. | |
541 | */ | |
542 | void can_bus_off(struct net_device *dev) | |
543 | { | |
544 | struct can_priv *priv = netdev_priv(dev); | |
545 | ||
aabdfd6a | 546 | netdev_dbg(dev, "bus-off\n"); |
39549eef WG |
547 | |
548 | netif_carrier_off(dev); | |
39549eef WG |
549 | |
550 | if (priv->restart_ms) | |
551 | mod_timer(&priv->restart_timer, | |
552 | jiffies + (priv->restart_ms * HZ) / 1000); | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(can_bus_off); | |
555 | ||
556 | static void can_setup(struct net_device *dev) | |
557 | { | |
558 | dev->type = ARPHRD_CAN; | |
1e0625fa | 559 | dev->mtu = CAN_MTU; |
39549eef WG |
560 | dev->hard_header_len = 0; |
561 | dev->addr_len = 0; | |
562 | dev->tx_queue_len = 10; | |
563 | ||
564 | /* New-style flags. */ | |
565 | dev->flags = IFF_NOARP; | |
34324dc2 | 566 | dev->features = NETIF_F_HW_CSUM; |
39549eef WG |
567 | } |
568 | ||
7b6856a0 WG |
569 | struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) |
570 | { | |
571 | struct sk_buff *skb; | |
572 | ||
156c2bb9 OH |
573 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + |
574 | sizeof(struct can_frame)); | |
7b6856a0 WG |
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; | |
156c2bb9 | 581 | |
96943901 OH |
582 | skb_reset_mac_header(skb); |
583 | skb_reset_network_header(skb); | |
584 | skb_reset_transport_header(skb); | |
585 | ||
2bf3440d OH |
586 | can_skb_reserve(skb); |
587 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 588 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 589 | |
7b6856a0 WG |
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 | } | |
595 | EXPORT_SYMBOL_GPL(alloc_can_skb); | |
596 | ||
cb2518ca SG |
597 | struct 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 | ||
96943901 OH |
611 | skb_reset_mac_header(skb); |
612 | skb_reset_network_header(skb); | |
613 | skb_reset_transport_header(skb); | |
614 | ||
cb2518ca SG |
615 | can_skb_reserve(skb); |
616 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 617 | can_skb_prv(skb)->skbcnt = 0; |
cb2518ca SG |
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 | } | |
624 | EXPORT_SYMBOL_GPL(alloc_canfd_skb); | |
625 | ||
7b6856a0 WG |
626 | struct 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 | } | |
639 | EXPORT_SYMBOL_GPL(alloc_can_err_skb); | |
640 | ||
39549eef WG |
641 | /* |
642 | * Allocate and setup space for the CAN network device | |
643 | */ | |
a6e4bc53 | 644 | struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max) |
39549eef WG |
645 | { |
646 | struct net_device *dev; | |
647 | struct can_priv *priv; | |
a6e4bc53 | 648 | int size; |
39549eef | 649 | |
a6e4bc53 WG |
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 | ||
c835a677 | 656 | dev = alloc_netdev(size, "can%d", NET_NAME_UNKNOWN, can_setup); |
39549eef WG |
657 | if (!dev) |
658 | return NULL; | |
659 | ||
660 | priv = netdev_priv(dev); | |
661 | ||
a6e4bc53 WG |
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 | ||
39549eef WG |
668 | priv->state = CAN_STATE_STOPPED; |
669 | ||
670 | init_timer(&priv->restart_timer); | |
671 | ||
672 | return dev; | |
673 | } | |
674 | EXPORT_SYMBOL_GPL(alloc_candev); | |
675 | ||
676 | /* | |
677 | * Free space of the CAN network device | |
678 | */ | |
679 | void free_candev(struct net_device *dev) | |
680 | { | |
681 | free_netdev(dev); | |
682 | } | |
683 | EXPORT_SYMBOL_GPL(free_candev); | |
684 | ||
bc05a894 OH |
685 | /* |
686 | * changing MTU and control mode for CAN/CANFD devices | |
687 | */ | |
688 | int can_change_mtu(struct net_device *dev, int new_mtu) | |
689 | { | |
690 | struct can_priv *priv = netdev_priv(dev); | |
691 | ||
692 | /* Do not allow changing the MTU while running */ | |
693 | if (dev->flags & IFF_UP) | |
694 | return -EBUSY; | |
695 | ||
696 | /* allow change of MTU according to the CANFD ability of the device */ | |
697 | switch (new_mtu) { | |
698 | case CAN_MTU: | |
bb208f14 OH |
699 | /* 'CANFD-only' controllers can not switch to CAN_MTU */ |
700 | if (priv->ctrlmode_static & CAN_CTRLMODE_FD) | |
701 | return -EINVAL; | |
702 | ||
bc05a894 OH |
703 | priv->ctrlmode &= ~CAN_CTRLMODE_FD; |
704 | break; | |
705 | ||
706 | case CANFD_MTU: | |
bb208f14 OH |
707 | /* check for potential CANFD ability */ |
708 | if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) && | |
709 | !(priv->ctrlmode_static & CAN_CTRLMODE_FD)) | |
bc05a894 OH |
710 | return -EINVAL; |
711 | ||
712 | priv->ctrlmode |= CAN_CTRLMODE_FD; | |
713 | break; | |
714 | ||
715 | default: | |
716 | return -EINVAL; | |
717 | } | |
718 | ||
719 | dev->mtu = new_mtu; | |
720 | return 0; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(can_change_mtu); | |
723 | ||
39549eef WG |
724 | /* |
725 | * Common open function when the device gets opened. | |
726 | * | |
727 | * This function should be called in the open function of the device | |
728 | * driver. | |
729 | */ | |
730 | int open_candev(struct net_device *dev) | |
731 | { | |
732 | struct can_priv *priv = netdev_priv(dev); | |
733 | ||
b30749fd | 734 | if (!priv->bittiming.bitrate) { |
aabdfd6a | 735 | netdev_err(dev, "bit-timing not yet defined\n"); |
39549eef WG |
736 | return -EINVAL; |
737 | } | |
738 | ||
dd22586d OH |
739 | /* For CAN FD the data bitrate has to be >= the arbitration bitrate */ |
740 | if ((priv->ctrlmode & CAN_CTRLMODE_FD) && | |
741 | (!priv->data_bittiming.bitrate || | |
742 | (priv->data_bittiming.bitrate < priv->bittiming.bitrate))) { | |
743 | netdev_err(dev, "incorrect/missing data bit-timing\n"); | |
744 | return -EINVAL; | |
745 | } | |
746 | ||
1b0d9224 WG |
747 | /* Switch carrier on if device was stopped while in bus-off state */ |
748 | if (!netif_carrier_ok(dev)) | |
749 | netif_carrier_on(dev); | |
750 | ||
39549eef WG |
751 | setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev); |
752 | ||
753 | return 0; | |
754 | } | |
128ced8f | 755 | EXPORT_SYMBOL_GPL(open_candev); |
39549eef WG |
756 | |
757 | /* | |
758 | * Common close function for cleanup before the device gets closed. | |
759 | * | |
760 | * This function should be called in the close function of the device | |
761 | * driver. | |
762 | */ | |
763 | void close_candev(struct net_device *dev) | |
764 | { | |
765 | struct can_priv *priv = netdev_priv(dev); | |
766 | ||
ab48b03e | 767 | del_timer_sync(&priv->restart_timer); |
39549eef WG |
768 | can_flush_echo_skb(dev); |
769 | } | |
770 | EXPORT_SYMBOL_GPL(close_candev); | |
771 | ||
772 | /* | |
773 | * CAN netlink interface | |
774 | */ | |
775 | static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { | |
776 | [IFLA_CAN_STATE] = { .type = NLA_U32 }, | |
777 | [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) }, | |
778 | [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 }, | |
779 | [IFLA_CAN_RESTART] = { .type = NLA_U32 }, | |
780 | [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) }, | |
781 | [IFLA_CAN_BITTIMING_CONST] | |
782 | = { .len = sizeof(struct can_bittiming_const) }, | |
783 | [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) }, | |
52c793f2 | 784 | [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) }, |
9859ccd2 OH |
785 | [IFLA_CAN_DATA_BITTIMING] |
786 | = { .len = sizeof(struct can_bittiming) }, | |
787 | [IFLA_CAN_DATA_BITTIMING_CONST] | |
788 | = { .len = sizeof(struct can_bittiming_const) }, | |
39549eef WG |
789 | }; |
790 | ||
bb208f14 OH |
791 | static int can_validate(struct nlattr *tb[], struct nlattr *data[]) |
792 | { | |
793 | bool is_can_fd = false; | |
794 | ||
795 | /* Make sure that valid CAN FD configurations always consist of | |
796 | * - nominal/arbitration bittiming | |
797 | * - data bittiming | |
798 | * - control mode with CAN_CTRLMODE_FD set | |
799 | */ | |
800 | ||
bce271f2 OH |
801 | if (!data) |
802 | return 0; | |
803 | ||
bb208f14 OH |
804 | if (data[IFLA_CAN_CTRLMODE]) { |
805 | struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
806 | ||
807 | is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD; | |
808 | } | |
809 | ||
810 | if (is_can_fd) { | |
811 | if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING]) | |
812 | return -EOPNOTSUPP; | |
813 | } | |
814 | ||
815 | if (data[IFLA_CAN_DATA_BITTIMING]) { | |
816 | if (!is_can_fd || !data[IFLA_CAN_BITTIMING]) | |
817 | return -EOPNOTSUPP; | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
39549eef WG |
823 | static int can_changelink(struct net_device *dev, |
824 | struct nlattr *tb[], struct nlattr *data[]) | |
825 | { | |
826 | struct can_priv *priv = netdev_priv(dev); | |
827 | int err; | |
828 | ||
829 | /* We need synchronization with dev->stop() */ | |
830 | ASSERT_RTNL(); | |
831 | ||
39549eef WG |
832 | if (data[IFLA_CAN_BITTIMING]) { |
833 | struct can_bittiming bt; | |
834 | ||
835 | /* Do not allow changing bittiming while running */ | |
836 | if (dev->flags & IFF_UP) | |
837 | return -EBUSY; | |
838 | memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); | |
08da7da4 | 839 | err = can_get_bittiming(dev, &bt, priv->bittiming_const); |
39549eef WG |
840 | if (err) |
841 | return err; | |
842 | memcpy(&priv->bittiming, &bt, sizeof(bt)); | |
843 | ||
844 | if (priv->do_set_bittiming) { | |
845 | /* Finally, set the bit-timing registers */ | |
846 | err = priv->do_set_bittiming(dev); | |
847 | if (err) | |
848 | return err; | |
849 | } | |
850 | } | |
851 | ||
49cb5c0e MKB |
852 | if (data[IFLA_CAN_CTRLMODE]) { |
853 | struct can_ctrlmode *cm; | |
bb208f14 OH |
854 | u32 ctrlstatic; |
855 | u32 maskedflags; | |
49cb5c0e MKB |
856 | |
857 | /* Do not allow changing controller mode while running */ | |
858 | if (dev->flags & IFF_UP) | |
859 | return -EBUSY; | |
860 | cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
bb208f14 OH |
861 | ctrlstatic = priv->ctrlmode_static; |
862 | maskedflags = cm->flags & cm->mask; | |
863 | ||
864 | /* check whether provided bits are allowed to be passed */ | |
865 | if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic)) | |
866 | return -EOPNOTSUPP; | |
867 | ||
868 | /* do not check for static fd-non-iso if 'fd' is disabled */ | |
869 | if (!(maskedflags & CAN_CTRLMODE_FD)) | |
870 | ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; | |
9b1087aa | 871 | |
bb208f14 OH |
872 | /* make sure static options are provided by configuration */ |
873 | if ((maskedflags & ctrlstatic) != ctrlstatic) | |
49cb5c0e | 874 | return -EOPNOTSUPP; |
9b1087aa OH |
875 | |
876 | /* clear bits to be modified and copy the flag values */ | |
49cb5c0e | 877 | priv->ctrlmode &= ~cm->mask; |
bb208f14 | 878 | priv->ctrlmode |= maskedflags; |
bc05a894 OH |
879 | |
880 | /* CAN_CTRLMODE_FD can only be set when driver supports FD */ | |
881 | if (priv->ctrlmode & CAN_CTRLMODE_FD) | |
882 | dev->mtu = CANFD_MTU; | |
883 | else | |
884 | dev->mtu = CAN_MTU; | |
49cb5c0e MKB |
885 | } |
886 | ||
39549eef WG |
887 | if (data[IFLA_CAN_RESTART_MS]) { |
888 | /* Do not allow changing restart delay while running */ | |
889 | if (dev->flags & IFF_UP) | |
890 | return -EBUSY; | |
891 | priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); | |
892 | } | |
893 | ||
894 | if (data[IFLA_CAN_RESTART]) { | |
895 | /* Do not allow a restart while not running */ | |
896 | if (!(dev->flags & IFF_UP)) | |
897 | return -EINVAL; | |
898 | err = can_restart_now(dev); | |
899 | if (err) | |
900 | return err; | |
901 | } | |
902 | ||
9859ccd2 OH |
903 | if (data[IFLA_CAN_DATA_BITTIMING]) { |
904 | struct can_bittiming dbt; | |
905 | ||
906 | /* Do not allow changing bittiming while running */ | |
907 | if (dev->flags & IFF_UP) | |
908 | return -EBUSY; | |
909 | memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), | |
910 | sizeof(dbt)); | |
911 | err = can_get_bittiming(dev, &dbt, priv->data_bittiming_const); | |
912 | if (err) | |
913 | return err; | |
914 | memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); | |
915 | ||
916 | if (priv->do_set_data_bittiming) { | |
917 | /* Finally, set the bit-timing registers */ | |
918 | err = priv->do_set_data_bittiming(dev); | |
919 | if (err) | |
920 | return err; | |
921 | } | |
922 | } | |
923 | ||
39549eef WG |
924 | return 0; |
925 | } | |
926 | ||
53a0ef86 WG |
927 | static size_t can_get_size(const struct net_device *dev) |
928 | { | |
929 | struct can_priv *priv = netdev_priv(dev); | |
c13c64d8 MKB |
930 | size_t size = 0; |
931 | ||
b30749fd OH |
932 | if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ |
933 | size += nla_total_size(sizeof(struct can_bittiming)); | |
c13c64d8 | 934 | if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ |
fe119a05 | 935 | size += nla_total_size(sizeof(struct can_bittiming_const)); |
c13c64d8 MKB |
936 | size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ |
937 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ | |
938 | size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ | |
939 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ | |
940 | if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ | |
941 | size += nla_total_size(sizeof(struct can_berr_counter)); | |
9859ccd2 OH |
942 | if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */ |
943 | size += nla_total_size(sizeof(struct can_bittiming)); | |
944 | if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */ | |
945 | size += nla_total_size(sizeof(struct can_bittiming_const)); | |
53a0ef86 WG |
946 | |
947 | return size; | |
948 | } | |
949 | ||
39549eef WG |
950 | static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) |
951 | { | |
952 | struct can_priv *priv = netdev_priv(dev); | |
953 | struct can_ctrlmode cm = {.flags = priv->ctrlmode}; | |
52c793f2 | 954 | struct can_berr_counter bec; |
39549eef WG |
955 | enum can_state state = priv->state; |
956 | ||
957 | if (priv->do_get_state) | |
958 | priv->do_get_state(dev, &state); | |
9859ccd2 | 959 | |
b30749fd OH |
960 | if ((priv->bittiming.bitrate && |
961 | nla_put(skb, IFLA_CAN_BITTIMING, | |
962 | sizeof(priv->bittiming), &priv->bittiming)) || | |
9859ccd2 | 963 | |
57a59b9e MKB |
964 | (priv->bittiming_const && |
965 | nla_put(skb, IFLA_CAN_BITTIMING_CONST, | |
966 | sizeof(*priv->bittiming_const), priv->bittiming_const)) || | |
9859ccd2 | 967 | |
562b103a | 968 | nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) || |
57a59b9e MKB |
969 | nla_put_u32(skb, IFLA_CAN_STATE, state) || |
970 | nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || | |
971 | nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || | |
9859ccd2 | 972 | |
31e0e328 DM |
973 | (priv->do_get_berr_counter && |
974 | !priv->do_get_berr_counter(dev, &bec) && | |
9859ccd2 OH |
975 | nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || |
976 | ||
977 | (priv->data_bittiming.bitrate && | |
978 | nla_put(skb, IFLA_CAN_DATA_BITTIMING, | |
979 | sizeof(priv->data_bittiming), &priv->data_bittiming)) || | |
980 | ||
981 | (priv->data_bittiming_const && | |
982 | nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST, | |
983 | sizeof(*priv->data_bittiming_const), | |
984 | priv->data_bittiming_const))) | |
57a59b9e | 985 | return -EMSGSIZE; |
9859ccd2 | 986 | |
39549eef | 987 | return 0; |
39549eef WG |
988 | } |
989 | ||
55369c0a WG |
990 | static size_t can_get_xstats_size(const struct net_device *dev) |
991 | { | |
992 | return sizeof(struct can_device_stats); | |
993 | } | |
994 | ||
39549eef WG |
995 | static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) |
996 | { | |
997 | struct can_priv *priv = netdev_priv(dev); | |
998 | ||
31e0e328 DM |
999 | if (nla_put(skb, IFLA_INFO_XSTATS, |
1000 | sizeof(priv->can_stats), &priv->can_stats)) | |
1001 | goto nla_put_failure; | |
39549eef WG |
1002 | return 0; |
1003 | ||
1004 | nla_put_failure: | |
1005 | return -EMSGSIZE; | |
1006 | } | |
1007 | ||
81adee47 | 1008 | static int can_newlink(struct net *src_net, struct net_device *dev, |
993e6f2f OH |
1009 | struct nlattr *tb[], struct nlattr *data[]) |
1010 | { | |
1011 | return -EOPNOTSUPP; | |
1012 | } | |
1013 | ||
25e1ed6e OH |
1014 | static void can_dellink(struct net_device *dev, struct list_head *head) |
1015 | { | |
1016 | return; | |
1017 | } | |
1018 | ||
39549eef WG |
1019 | static struct rtnl_link_ops can_link_ops __read_mostly = { |
1020 | .kind = "can", | |
1021 | .maxtype = IFLA_CAN_MAX, | |
1022 | .policy = can_policy, | |
1023 | .setup = can_setup, | |
bb208f14 | 1024 | .validate = can_validate, |
993e6f2f | 1025 | .newlink = can_newlink, |
39549eef | 1026 | .changelink = can_changelink, |
25e1ed6e | 1027 | .dellink = can_dellink, |
53a0ef86 | 1028 | .get_size = can_get_size, |
39549eef | 1029 | .fill_info = can_fill_info, |
55369c0a | 1030 | .get_xstats_size = can_get_xstats_size, |
39549eef WG |
1031 | .fill_xstats = can_fill_xstats, |
1032 | }; | |
1033 | ||
1034 | /* | |
1035 | * Register the CAN network device | |
1036 | */ | |
1037 | int register_candev(struct net_device *dev) | |
1038 | { | |
1039 | dev->rtnl_link_ops = &can_link_ops; | |
1040 | return register_netdev(dev); | |
1041 | } | |
1042 | EXPORT_SYMBOL_GPL(register_candev); | |
1043 | ||
1044 | /* | |
1045 | * Unregister the CAN network device | |
1046 | */ | |
1047 | void unregister_candev(struct net_device *dev) | |
1048 | { | |
1049 | unregister_netdev(dev); | |
1050 | } | |
1051 | EXPORT_SYMBOL_GPL(unregister_candev); | |
1052 | ||
bf03a537 KVD |
1053 | /* |
1054 | * Test if a network device is a candev based device | |
1055 | * and return the can_priv* if so. | |
1056 | */ | |
1057 | struct can_priv *safe_candev_priv(struct net_device *dev) | |
1058 | { | |
1059 | if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops)) | |
1060 | return NULL; | |
1061 | ||
1062 | return netdev_priv(dev); | |
1063 | } | |
1064 | EXPORT_SYMBOL_GPL(safe_candev_priv); | |
1065 | ||
39549eef WG |
1066 | static __init int can_dev_init(void) |
1067 | { | |
1068 | int err; | |
1069 | ||
a1ef7bd9 KVD |
1070 | can_led_notifier_init(); |
1071 | ||
39549eef WG |
1072 | err = rtnl_link_register(&can_link_ops); |
1073 | if (!err) | |
1074 | printk(KERN_INFO MOD_DESC "\n"); | |
1075 | ||
1076 | return err; | |
1077 | } | |
1078 | module_init(can_dev_init); | |
1079 | ||
1080 | static __exit void can_dev_exit(void) | |
1081 | { | |
1082 | rtnl_link_unregister(&can_link_ops); | |
a1ef7bd9 KVD |
1083 | |
1084 | can_led_notifier_exit(); | |
39549eef WG |
1085 | } |
1086 | module_exit(can_dev_exit); | |
1087 | ||
1088 | MODULE_ALIAS_RTNL_LINK("can"); |