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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 | 319 | /* check flag whether this packet has to be looped back */ |
a94bc9c4 OH |
320 | if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK || |
321 | (skb->protocol != htons(ETH_P_CAN) && | |
322 | skb->protocol != htons(ETH_P_CANFD))) { | |
39549eef WG |
323 | kfree_skb(skb); |
324 | return; | |
325 | } | |
326 | ||
327 | if (!priv->echo_skb[idx]) { | |
39549eef | 328 | |
0ae89beb OH |
329 | skb = can_create_echo_skb(skb); |
330 | if (!skb) | |
331 | return; | |
39549eef WG |
332 | |
333 | /* make settings for echo to reduce code in irq context */ | |
39549eef WG |
334 | skb->pkt_type = PACKET_BROADCAST; |
335 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
336 | skb->dev = dev; | |
337 | ||
338 | /* save this skb for tx interrupt echo handling */ | |
339 | priv->echo_skb[idx] = skb; | |
340 | } else { | |
341 | /* locking problem with netif_stop_queue() ?? */ | |
aabdfd6a | 342 | netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__); |
39549eef WG |
343 | kfree_skb(skb); |
344 | } | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(can_put_echo_skb); | |
347 | ||
348 | /* | |
349 | * Get the skb from the stack and loop it back locally | |
350 | * | |
351 | * The function is typically called when the TX done interrupt | |
352 | * is handled in the device driver. The driver must protect | |
353 | * access to priv->echo_skb, if necessary. | |
354 | */ | |
cf5046b3 | 355 | unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) |
39549eef WG |
356 | { |
357 | struct can_priv *priv = netdev_priv(dev); | |
358 | ||
a6e4bc53 WG |
359 | BUG_ON(idx >= priv->echo_skb_max); |
360 | ||
39e3ab6f | 361 | if (priv->echo_skb[idx]) { |
cf5046b3 MKB |
362 | struct sk_buff *skb = priv->echo_skb[idx]; |
363 | struct can_frame *cf = (struct can_frame *)skb->data; | |
364 | u8 dlc = cf->can_dlc; | |
365 | ||
39549eef WG |
366 | netif_rx(priv->echo_skb[idx]); |
367 | priv->echo_skb[idx] = NULL; | |
cf5046b3 MKB |
368 | |
369 | return dlc; | |
39549eef | 370 | } |
cf5046b3 MKB |
371 | |
372 | return 0; | |
39549eef WG |
373 | } |
374 | EXPORT_SYMBOL_GPL(can_get_echo_skb); | |
375 | ||
39e3ab6f WG |
376 | /* |
377 | * Remove the skb from the stack and free it. | |
378 | * | |
379 | * The function is typically called when TX failed. | |
380 | */ | |
a6e4bc53 | 381 | void can_free_echo_skb(struct net_device *dev, unsigned int idx) |
39e3ab6f WG |
382 | { |
383 | struct can_priv *priv = netdev_priv(dev); | |
384 | ||
a6e4bc53 WG |
385 | BUG_ON(idx >= priv->echo_skb_max); |
386 | ||
39e3ab6f WG |
387 | if (priv->echo_skb[idx]) { |
388 | kfree_skb(priv->echo_skb[idx]); | |
389 | priv->echo_skb[idx] = NULL; | |
390 | } | |
391 | } | |
392 | EXPORT_SYMBOL_GPL(can_free_echo_skb); | |
393 | ||
39549eef WG |
394 | /* |
395 | * CAN device restart for bus-off recovery | |
396 | */ | |
77fc95a3 | 397 | static void can_restart(unsigned long data) |
39549eef WG |
398 | { |
399 | struct net_device *dev = (struct net_device *)data; | |
400 | struct can_priv *priv = netdev_priv(dev); | |
401 | struct net_device_stats *stats = &dev->stats; | |
402 | struct sk_buff *skb; | |
403 | struct can_frame *cf; | |
404 | int err; | |
405 | ||
406 | BUG_ON(netif_carrier_ok(dev)); | |
407 | ||
408 | /* | |
409 | * No synchronization needed because the device is bus-off and | |
410 | * no messages can come in or go out. | |
411 | */ | |
412 | can_flush_echo_skb(dev); | |
413 | ||
414 | /* send restart message upstream */ | |
7b6856a0 | 415 | skb = alloc_can_err_skb(dev, &cf); |
39549eef WG |
416 | if (skb == NULL) { |
417 | err = -ENOMEM; | |
b3d0df7c | 418 | goto restart; |
39549eef | 419 | } |
7b6856a0 | 420 | cf->can_id |= CAN_ERR_RESTARTED; |
39549eef WG |
421 | |
422 | netif_rx(skb); | |
423 | ||
39549eef WG |
424 | stats->rx_packets++; |
425 | stats->rx_bytes += cf->can_dlc; | |
426 | ||
b3d0df7c | 427 | restart: |
aabdfd6a | 428 | netdev_dbg(dev, "restarted\n"); |
39549eef WG |
429 | priv->can_stats.restarts++; |
430 | ||
431 | /* Now restart the device */ | |
432 | err = priv->do_set_mode(dev, CAN_MODE_START); | |
433 | ||
39549eef WG |
434 | netif_carrier_on(dev); |
435 | if (err) | |
aabdfd6a | 436 | netdev_err(dev, "Error %d during restart", err); |
39549eef WG |
437 | } |
438 | ||
439 | int can_restart_now(struct net_device *dev) | |
440 | { | |
441 | struct can_priv *priv = netdev_priv(dev); | |
442 | ||
443 | /* | |
444 | * A manual restart is only permitted if automatic restart is | |
445 | * disabled and the device is in the bus-off state | |
446 | */ | |
447 | if (priv->restart_ms) | |
448 | return -EINVAL; | |
449 | if (priv->state != CAN_STATE_BUS_OFF) | |
450 | return -EBUSY; | |
451 | ||
452 | /* Runs as soon as possible in the timer context */ | |
453 | mod_timer(&priv->restart_timer, jiffies); | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | /* | |
459 | * CAN bus-off | |
460 | * | |
461 | * This functions should be called when the device goes bus-off to | |
462 | * tell the netif layer that no more packets can be sent or received. | |
463 | * If enabled, a timer is started to trigger bus-off recovery. | |
464 | */ | |
465 | void can_bus_off(struct net_device *dev) | |
466 | { | |
467 | struct can_priv *priv = netdev_priv(dev); | |
468 | ||
aabdfd6a | 469 | netdev_dbg(dev, "bus-off\n"); |
39549eef WG |
470 | |
471 | netif_carrier_off(dev); | |
472 | priv->can_stats.bus_off++; | |
473 | ||
474 | if (priv->restart_ms) | |
475 | mod_timer(&priv->restart_timer, | |
476 | jiffies + (priv->restart_ms * HZ) / 1000); | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(can_bus_off); | |
479 | ||
480 | static void can_setup(struct net_device *dev) | |
481 | { | |
482 | dev->type = ARPHRD_CAN; | |
1e0625fa | 483 | dev->mtu = CAN_MTU; |
39549eef WG |
484 | dev->hard_header_len = 0; |
485 | dev->addr_len = 0; | |
486 | dev->tx_queue_len = 10; | |
487 | ||
488 | /* New-style flags. */ | |
489 | dev->flags = IFF_NOARP; | |
34324dc2 | 490 | dev->features = NETIF_F_HW_CSUM; |
39549eef WG |
491 | } |
492 | ||
7b6856a0 WG |
493 | struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) |
494 | { | |
495 | struct sk_buff *skb; | |
496 | ||
156c2bb9 OH |
497 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + |
498 | sizeof(struct can_frame)); | |
7b6856a0 WG |
499 | if (unlikely(!skb)) |
500 | return NULL; | |
501 | ||
502 | skb->protocol = htons(ETH_P_CAN); | |
503 | skb->pkt_type = PACKET_BROADCAST; | |
504 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
156c2bb9 | 505 | |
2bf3440d OH |
506 | can_skb_reserve(skb); |
507 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
156c2bb9 | 508 | |
7b6856a0 WG |
509 | *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); |
510 | memset(*cf, 0, sizeof(struct can_frame)); | |
511 | ||
512 | return skb; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(alloc_can_skb); | |
515 | ||
cb2518ca SG |
516 | struct sk_buff *alloc_canfd_skb(struct net_device *dev, |
517 | struct canfd_frame **cfd) | |
518 | { | |
519 | struct sk_buff *skb; | |
520 | ||
521 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + | |
522 | sizeof(struct canfd_frame)); | |
523 | if (unlikely(!skb)) | |
524 | return NULL; | |
525 | ||
526 | skb->protocol = htons(ETH_P_CANFD); | |
527 | skb->pkt_type = PACKET_BROADCAST; | |
528 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
529 | ||
530 | can_skb_reserve(skb); | |
531 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
532 | ||
533 | *cfd = (struct canfd_frame *)skb_put(skb, sizeof(struct canfd_frame)); | |
534 | memset(*cfd, 0, sizeof(struct canfd_frame)); | |
535 | ||
536 | return skb; | |
537 | } | |
538 | EXPORT_SYMBOL_GPL(alloc_canfd_skb); | |
539 | ||
7b6856a0 WG |
540 | struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) |
541 | { | |
542 | struct sk_buff *skb; | |
543 | ||
544 | skb = alloc_can_skb(dev, cf); | |
545 | if (unlikely(!skb)) | |
546 | return NULL; | |
547 | ||
548 | (*cf)->can_id = CAN_ERR_FLAG; | |
549 | (*cf)->can_dlc = CAN_ERR_DLC; | |
550 | ||
551 | return skb; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(alloc_can_err_skb); | |
554 | ||
39549eef WG |
555 | /* |
556 | * Allocate and setup space for the CAN network device | |
557 | */ | |
a6e4bc53 | 558 | struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max) |
39549eef WG |
559 | { |
560 | struct net_device *dev; | |
561 | struct can_priv *priv; | |
a6e4bc53 | 562 | int size; |
39549eef | 563 | |
a6e4bc53 WG |
564 | if (echo_skb_max) |
565 | size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) + | |
566 | echo_skb_max * sizeof(struct sk_buff *); | |
567 | else | |
568 | size = sizeof_priv; | |
569 | ||
570 | dev = alloc_netdev(size, "can%d", can_setup); | |
39549eef WG |
571 | if (!dev) |
572 | return NULL; | |
573 | ||
574 | priv = netdev_priv(dev); | |
575 | ||
a6e4bc53 WG |
576 | if (echo_skb_max) { |
577 | priv->echo_skb_max = echo_skb_max; | |
578 | priv->echo_skb = (void *)priv + | |
579 | ALIGN(sizeof_priv, sizeof(struct sk_buff *)); | |
580 | } | |
581 | ||
39549eef WG |
582 | priv->state = CAN_STATE_STOPPED; |
583 | ||
584 | init_timer(&priv->restart_timer); | |
585 | ||
586 | return dev; | |
587 | } | |
588 | EXPORT_SYMBOL_GPL(alloc_candev); | |
589 | ||
590 | /* | |
591 | * Free space of the CAN network device | |
592 | */ | |
593 | void free_candev(struct net_device *dev) | |
594 | { | |
595 | free_netdev(dev); | |
596 | } | |
597 | EXPORT_SYMBOL_GPL(free_candev); | |
598 | ||
599 | /* | |
600 | * Common open function when the device gets opened. | |
601 | * | |
602 | * This function should be called in the open function of the device | |
603 | * driver. | |
604 | */ | |
605 | int open_candev(struct net_device *dev) | |
606 | { | |
607 | struct can_priv *priv = netdev_priv(dev); | |
608 | ||
b30749fd | 609 | if (!priv->bittiming.bitrate) { |
aabdfd6a | 610 | netdev_err(dev, "bit-timing not yet defined\n"); |
39549eef WG |
611 | return -EINVAL; |
612 | } | |
613 | ||
1b0d9224 WG |
614 | /* Switch carrier on if device was stopped while in bus-off state */ |
615 | if (!netif_carrier_ok(dev)) | |
616 | netif_carrier_on(dev); | |
617 | ||
39549eef WG |
618 | setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev); |
619 | ||
620 | return 0; | |
621 | } | |
128ced8f | 622 | EXPORT_SYMBOL_GPL(open_candev); |
39549eef WG |
623 | |
624 | /* | |
625 | * Common close function for cleanup before the device gets closed. | |
626 | * | |
627 | * This function should be called in the close function of the device | |
628 | * driver. | |
629 | */ | |
630 | void close_candev(struct net_device *dev) | |
631 | { | |
632 | struct can_priv *priv = netdev_priv(dev); | |
633 | ||
ab48b03e | 634 | del_timer_sync(&priv->restart_timer); |
39549eef WG |
635 | can_flush_echo_skb(dev); |
636 | } | |
637 | EXPORT_SYMBOL_GPL(close_candev); | |
638 | ||
639 | /* | |
640 | * CAN netlink interface | |
641 | */ | |
642 | static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { | |
643 | [IFLA_CAN_STATE] = { .type = NLA_U32 }, | |
644 | [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) }, | |
645 | [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 }, | |
646 | [IFLA_CAN_RESTART] = { .type = NLA_U32 }, | |
647 | [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) }, | |
648 | [IFLA_CAN_BITTIMING_CONST] | |
649 | = { .len = sizeof(struct can_bittiming_const) }, | |
650 | [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) }, | |
52c793f2 | 651 | [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) }, |
39549eef WG |
652 | }; |
653 | ||
654 | static int can_changelink(struct net_device *dev, | |
655 | struct nlattr *tb[], struct nlattr *data[]) | |
656 | { | |
657 | struct can_priv *priv = netdev_priv(dev); | |
658 | int err; | |
659 | ||
660 | /* We need synchronization with dev->stop() */ | |
661 | ASSERT_RTNL(); | |
662 | ||
39549eef WG |
663 | if (data[IFLA_CAN_BITTIMING]) { |
664 | struct can_bittiming bt; | |
665 | ||
666 | /* Do not allow changing bittiming while running */ | |
667 | if (dev->flags & IFF_UP) | |
668 | return -EBUSY; | |
669 | memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); | |
670 | if ((!bt.bitrate && !bt.tq) || (bt.bitrate && bt.tq)) | |
671 | return -EINVAL; | |
672 | err = can_get_bittiming(dev, &bt); | |
673 | if (err) | |
674 | return err; | |
675 | memcpy(&priv->bittiming, &bt, sizeof(bt)); | |
676 | ||
677 | if (priv->do_set_bittiming) { | |
678 | /* Finally, set the bit-timing registers */ | |
679 | err = priv->do_set_bittiming(dev); | |
680 | if (err) | |
681 | return err; | |
682 | } | |
683 | } | |
684 | ||
49cb5c0e MKB |
685 | if (data[IFLA_CAN_CTRLMODE]) { |
686 | struct can_ctrlmode *cm; | |
687 | ||
688 | /* Do not allow changing controller mode while running */ | |
689 | if (dev->flags & IFF_UP) | |
690 | return -EBUSY; | |
691 | cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
692 | if (cm->flags & ~priv->ctrlmode_supported) | |
693 | return -EOPNOTSUPP; | |
694 | priv->ctrlmode &= ~cm->mask; | |
695 | priv->ctrlmode |= cm->flags; | |
696 | } | |
697 | ||
39549eef WG |
698 | if (data[IFLA_CAN_RESTART_MS]) { |
699 | /* Do not allow changing restart delay while running */ | |
700 | if (dev->flags & IFF_UP) | |
701 | return -EBUSY; | |
702 | priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); | |
703 | } | |
704 | ||
705 | if (data[IFLA_CAN_RESTART]) { | |
706 | /* Do not allow a restart while not running */ | |
707 | if (!(dev->flags & IFF_UP)) | |
708 | return -EINVAL; | |
709 | err = can_restart_now(dev); | |
710 | if (err) | |
711 | return err; | |
712 | } | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
53a0ef86 WG |
717 | static size_t can_get_size(const struct net_device *dev) |
718 | { | |
719 | struct can_priv *priv = netdev_priv(dev); | |
c13c64d8 MKB |
720 | size_t size = 0; |
721 | ||
b30749fd OH |
722 | if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ |
723 | size += nla_total_size(sizeof(struct can_bittiming)); | |
c13c64d8 | 724 | if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ |
fe119a05 | 725 | size += nla_total_size(sizeof(struct can_bittiming_const)); |
c13c64d8 MKB |
726 | size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ |
727 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ | |
728 | size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ | |
729 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ | |
730 | if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ | |
731 | size += nla_total_size(sizeof(struct can_berr_counter)); | |
53a0ef86 WG |
732 | |
733 | return size; | |
734 | } | |
735 | ||
39549eef WG |
736 | static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) |
737 | { | |
738 | struct can_priv *priv = netdev_priv(dev); | |
739 | struct can_ctrlmode cm = {.flags = priv->ctrlmode}; | |
52c793f2 | 740 | struct can_berr_counter bec; |
39549eef WG |
741 | enum can_state state = priv->state; |
742 | ||
743 | if (priv->do_get_state) | |
744 | priv->do_get_state(dev, &state); | |
b30749fd OH |
745 | if ((priv->bittiming.bitrate && |
746 | nla_put(skb, IFLA_CAN_BITTIMING, | |
747 | sizeof(priv->bittiming), &priv->bittiming)) || | |
57a59b9e MKB |
748 | (priv->bittiming_const && |
749 | nla_put(skb, IFLA_CAN_BITTIMING_CONST, | |
750 | sizeof(*priv->bittiming_const), priv->bittiming_const)) || | |
31e0e328 | 751 | nla_put(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock) || |
57a59b9e MKB |
752 | nla_put_u32(skb, IFLA_CAN_STATE, state) || |
753 | nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || | |
754 | nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || | |
31e0e328 DM |
755 | (priv->do_get_berr_counter && |
756 | !priv->do_get_berr_counter(dev, &bec) && | |
57a59b9e MKB |
757 | nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec))) |
758 | return -EMSGSIZE; | |
39549eef | 759 | return 0; |
39549eef WG |
760 | } |
761 | ||
55369c0a WG |
762 | static size_t can_get_xstats_size(const struct net_device *dev) |
763 | { | |
764 | return sizeof(struct can_device_stats); | |
765 | } | |
766 | ||
39549eef WG |
767 | static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) |
768 | { | |
769 | struct can_priv *priv = netdev_priv(dev); | |
770 | ||
31e0e328 DM |
771 | if (nla_put(skb, IFLA_INFO_XSTATS, |
772 | sizeof(priv->can_stats), &priv->can_stats)) | |
773 | goto nla_put_failure; | |
39549eef WG |
774 | return 0; |
775 | ||
776 | nla_put_failure: | |
777 | return -EMSGSIZE; | |
778 | } | |
779 | ||
81adee47 | 780 | static int can_newlink(struct net *src_net, struct net_device *dev, |
993e6f2f OH |
781 | struct nlattr *tb[], struct nlattr *data[]) |
782 | { | |
783 | return -EOPNOTSUPP; | |
784 | } | |
785 | ||
39549eef WG |
786 | static struct rtnl_link_ops can_link_ops __read_mostly = { |
787 | .kind = "can", | |
788 | .maxtype = IFLA_CAN_MAX, | |
789 | .policy = can_policy, | |
790 | .setup = can_setup, | |
993e6f2f | 791 | .newlink = can_newlink, |
39549eef | 792 | .changelink = can_changelink, |
53a0ef86 | 793 | .get_size = can_get_size, |
39549eef | 794 | .fill_info = can_fill_info, |
55369c0a | 795 | .get_xstats_size = can_get_xstats_size, |
39549eef WG |
796 | .fill_xstats = can_fill_xstats, |
797 | }; | |
798 | ||
799 | /* | |
800 | * Register the CAN network device | |
801 | */ | |
802 | int register_candev(struct net_device *dev) | |
803 | { | |
804 | dev->rtnl_link_ops = &can_link_ops; | |
805 | return register_netdev(dev); | |
806 | } | |
807 | EXPORT_SYMBOL_GPL(register_candev); | |
808 | ||
809 | /* | |
810 | * Unregister the CAN network device | |
811 | */ | |
812 | void unregister_candev(struct net_device *dev) | |
813 | { | |
814 | unregister_netdev(dev); | |
815 | } | |
816 | EXPORT_SYMBOL_GPL(unregister_candev); | |
817 | ||
bf03a537 KVD |
818 | /* |
819 | * Test if a network device is a candev based device | |
820 | * and return the can_priv* if so. | |
821 | */ | |
822 | struct can_priv *safe_candev_priv(struct net_device *dev) | |
823 | { | |
824 | if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops)) | |
825 | return NULL; | |
826 | ||
827 | return netdev_priv(dev); | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(safe_candev_priv); | |
830 | ||
39549eef WG |
831 | static __init int can_dev_init(void) |
832 | { | |
833 | int err; | |
834 | ||
a1ef7bd9 KVD |
835 | can_led_notifier_init(); |
836 | ||
39549eef WG |
837 | err = rtnl_link_register(&can_link_ops); |
838 | if (!err) | |
839 | printk(KERN_INFO MOD_DESC "\n"); | |
840 | ||
841 | return err; | |
842 | } | |
843 | module_init(can_dev_init); | |
844 | ||
845 | static __exit void can_dev_exit(void) | |
846 | { | |
847 | rtnl_link_unregister(&can_link_ops); | |
a1ef7bd9 KVD |
848 | |
849 | can_led_notifier_exit(); | |
39549eef WG |
850 | } |
851 | module_exit(can_dev_exit); | |
852 | ||
853 | MODULE_ALIAS_RTNL_LINK("can"); |