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> | |
9abefcb1 | 24 | #include <linux/workqueue.h> |
39549eef WG |
25 | #include <linux/can.h> |
26 | #include <linux/can/dev.h> | |
156c2bb9 | 27 | #include <linux/can/skb.h> |
39549eef | 28 | #include <linux/can/netlink.h> |
a1ef7bd9 | 29 | #include <linux/can/led.h> |
39549eef WG |
30 | #include <net/rtnetlink.h> |
31 | ||
32 | #define MOD_DESC "CAN device driver interface" | |
33 | ||
34 | MODULE_DESCRIPTION(MOD_DESC); | |
35 | MODULE_LICENSE("GPL v2"); | |
36 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
37 | ||
1e0625fa OH |
38 | /* CAN DLC to real data length conversion helpers */ |
39 | ||
40 | static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7, | |
41 | 8, 12, 16, 20, 24, 32, 48, 64}; | |
42 | ||
43 | /* get data length from can_dlc with sanitized can_dlc */ | |
44 | u8 can_dlc2len(u8 can_dlc) | |
45 | { | |
46 | return dlc2len[can_dlc & 0x0F]; | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(can_dlc2len); | |
49 | ||
50 | static const u8 len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */ | |
51 | 9, 9, 9, 9, /* 9 - 12 */ | |
52 | 10, 10, 10, 10, /* 13 - 16 */ | |
53 | 11, 11, 11, 11, /* 17 - 20 */ | |
54 | 12, 12, 12, 12, /* 21 - 24 */ | |
55 | 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */ | |
56 | 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */ | |
57 | 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */ | |
58 | 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */ | |
59 | 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */ | |
60 | ||
61 | /* map the sanitized data length to an appropriate data length code */ | |
62 | u8 can_len2dlc(u8 len) | |
63 | { | |
64 | if (unlikely(len > 64)) | |
65 | return 0xF; | |
66 | ||
67 | return len2dlc[len]; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(can_len2dlc); | |
70 | ||
39549eef WG |
71 | #ifdef CONFIG_CAN_CALC_BITTIMING |
72 | #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */ | |
7da29f97 | 73 | #define CAN_CALC_SYNC_SEG 1 |
39549eef WG |
74 | |
75 | /* | |
76 | * Bit-timing calculation derived from: | |
77 | * | |
78 | * Code based on LinCAN sources and H8S2638 project | |
79 | * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz | |
80 | * Copyright 2005 Stanislav Marek | |
81 | * email: pisa@cmp.felk.cvut.cz | |
82 | * | |
83 | * Calculates proper bit-timing parameters for a specified bit-rate | |
84 | * and sample-point, which can then be used to set the bit-timing | |
85 | * registers of the CAN controller. You can find more information | |
86 | * in the header file linux/can/netlink.h. | |
87 | */ | |
7da29f97 MKB |
88 | static int can_update_sample_point(const struct can_bittiming_const *btc, |
89 | unsigned int sample_point_nominal, unsigned int tseg, | |
90 | unsigned int *tseg1_ptr, unsigned int *tseg2_ptr, | |
91 | unsigned int *sample_point_error_ptr) | |
39549eef | 92 | { |
7da29f97 MKB |
93 | unsigned int sample_point_error, best_sample_point_error = UINT_MAX; |
94 | unsigned int sample_point, best_sample_point = 0; | |
95 | unsigned int tseg1, tseg2; | |
96 | int i; | |
97 | ||
98 | for (i = 0; i <= 1; i++) { | |
99 | tseg2 = tseg + CAN_CALC_SYNC_SEG - (sample_point_nominal * (tseg + CAN_CALC_SYNC_SEG)) / 1000 - i; | |
100 | tseg2 = clamp(tseg2, btc->tseg2_min, btc->tseg2_max); | |
101 | tseg1 = tseg - tseg2; | |
102 | if (tseg1 > btc->tseg1_max) { | |
103 | tseg1 = btc->tseg1_max; | |
104 | tseg2 = tseg - tseg1; | |
105 | } | |
106 | ||
107 | sample_point = 1000 * (tseg + CAN_CALC_SYNC_SEG - tseg2) / (tseg + CAN_CALC_SYNC_SEG); | |
108 | sample_point_error = abs(sample_point_nominal - sample_point); | |
109 | ||
110 | if ((sample_point <= sample_point_nominal) && (sample_point_error < best_sample_point_error)) { | |
111 | best_sample_point = sample_point; | |
112 | best_sample_point_error = sample_point_error; | |
113 | *tseg1_ptr = tseg1; | |
114 | *tseg2_ptr = tseg2; | |
115 | } | |
39549eef | 116 | } |
7da29f97 MKB |
117 | |
118 | if (sample_point_error_ptr) | |
119 | *sample_point_error_ptr = best_sample_point_error; | |
120 | ||
121 | return best_sample_point; | |
39549eef WG |
122 | } |
123 | ||
08da7da4 OH |
124 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
125 | const struct can_bittiming_const *btc) | |
39549eef WG |
126 | { |
127 | struct can_priv *priv = netdev_priv(dev); | |
7da29f97 MKB |
128 | unsigned int bitrate; /* current bitrate */ |
129 | unsigned int bitrate_error; /* difference between current and nominal value */ | |
130 | unsigned int best_bitrate_error = UINT_MAX; | |
131 | unsigned int sample_point_error; /* difference between current and nominal value */ | |
132 | unsigned int best_sample_point_error = UINT_MAX; | |
133 | unsigned int sample_point_nominal; /* nominal sample point */ | |
134 | unsigned int best_tseg = 0; /* current best value for tseg */ | |
135 | unsigned int best_brp = 0; /* current best value for brp */ | |
136 | unsigned int brp, tsegall, tseg, tseg1 = 0, tseg2 = 0; | |
39549eef WG |
137 | u64 v64; |
138 | ||
67b5909e | 139 | /* Use CiA recommended sample points */ |
39549eef | 140 | if (bt->sample_point) { |
7da29f97 | 141 | sample_point_nominal = bt->sample_point; |
39549eef WG |
142 | } else { |
143 | if (bt->bitrate > 800000) | |
7da29f97 | 144 | sample_point_nominal = 750; |
39549eef | 145 | else if (bt->bitrate > 500000) |
7da29f97 | 146 | sample_point_nominal = 800; |
39549eef | 147 | else |
7da29f97 | 148 | sample_point_nominal = 875; |
39549eef WG |
149 | } |
150 | ||
151 | /* tseg even = round down, odd = round up */ | |
152 | for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1; | |
153 | tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) { | |
7da29f97 MKB |
154 | tsegall = CAN_CALC_SYNC_SEG + tseg / 2; |
155 | ||
39549eef WG |
156 | /* Compute all possible tseg choices (tseg=tseg1+tseg2) */ |
157 | brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2; | |
7da29f97 MKB |
158 | |
159 | /* choose brp step which is possible in system */ | |
39549eef WG |
160 | brp = (brp / btc->brp_inc) * btc->brp_inc; |
161 | if ((brp < btc->brp_min) || (brp > btc->brp_max)) | |
162 | continue; | |
7da29f97 MKB |
163 | |
164 | bitrate = priv->clock.freq / (brp * tsegall); | |
165 | bitrate_error = abs(bt->bitrate - bitrate); | |
166 | ||
39549eef | 167 | /* tseg brp biterror */ |
7da29f97 | 168 | if (bitrate_error > best_bitrate_error) |
39549eef | 169 | continue; |
7da29f97 MKB |
170 | |
171 | /* reset sample point error if we have a better bitrate */ | |
172 | if (bitrate_error < best_bitrate_error) | |
173 | best_sample_point_error = UINT_MAX; | |
174 | ||
175 | can_update_sample_point(btc, sample_point_nominal, tseg / 2, &tseg1, &tseg2, &sample_point_error); | |
176 | if (sample_point_error > best_sample_point_error) | |
177 | continue; | |
178 | ||
179 | best_sample_point_error = sample_point_error; | |
180 | best_bitrate_error = bitrate_error; | |
39549eef WG |
181 | best_tseg = tseg / 2; |
182 | best_brp = brp; | |
7da29f97 MKB |
183 | |
184 | if (bitrate_error == 0 && sample_point_error == 0) | |
39549eef WG |
185 | break; |
186 | } | |
187 | ||
7da29f97 | 188 | if (best_bitrate_error) { |
39549eef | 189 | /* Error in one-tenth of a percent */ |
7da29f97 MKB |
190 | v64 = (u64)best_bitrate_error * 1000; |
191 | do_div(v64, bt->bitrate); | |
192 | bitrate_error = (u32)v64; | |
193 | if (bitrate_error > CAN_CALC_MAX_ERROR) { | |
aabdfd6a | 194 | netdev_err(dev, |
7da29f97 MKB |
195 | "bitrate error %d.%d%% too high\n", |
196 | bitrate_error / 10, bitrate_error % 10); | |
39549eef | 197 | return -EDOM; |
39549eef | 198 | } |
7da29f97 MKB |
199 | netdev_warn(dev, "bitrate error %d.%d%%\n", |
200 | bitrate_error / 10, bitrate_error % 10); | |
39549eef WG |
201 | } |
202 | ||
203 | /* real sample point */ | |
7da29f97 MKB |
204 | bt->sample_point = can_update_sample_point(btc, sample_point_nominal, best_tseg, |
205 | &tseg1, &tseg2, NULL); | |
39549eef | 206 | |
7da29f97 | 207 | v64 = (u64)best_brp * 1000 * 1000 * 1000; |
39549eef WG |
208 | do_div(v64, priv->clock.freq); |
209 | bt->tq = (u32)v64; | |
210 | bt->prop_seg = tseg1 / 2; | |
211 | bt->phase_seg1 = tseg1 - bt->prop_seg; | |
212 | bt->phase_seg2 = tseg2; | |
2e114374 OH |
213 | |
214 | /* check for sjw user settings */ | |
7da29f97 | 215 | if (!bt->sjw || !btc->sjw_max) { |
2e114374 | 216 | bt->sjw = 1; |
7da29f97 | 217 | } else { |
2e114374 OH |
218 | /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */ |
219 | if (bt->sjw > btc->sjw_max) | |
220 | bt->sjw = btc->sjw_max; | |
221 | /* bt->sjw must not be higher than tseg2 */ | |
222 | if (tseg2 < bt->sjw) | |
223 | bt->sjw = tseg2; | |
224 | } | |
225 | ||
39549eef | 226 | bt->brp = best_brp; |
7da29f97 MKB |
227 | |
228 | /* real bitrate */ | |
229 | bt->bitrate = priv->clock.freq / (bt->brp * (CAN_CALC_SYNC_SEG + tseg1 + tseg2)); | |
39549eef WG |
230 | |
231 | return 0; | |
232 | } | |
233 | #else /* !CONFIG_CAN_CALC_BITTIMING */ | |
08da7da4 OH |
234 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
235 | const struct can_bittiming_const *btc) | |
39549eef | 236 | { |
aabdfd6a | 237 | netdev_err(dev, "bit-timing calculation not available\n"); |
39549eef WG |
238 | return -EINVAL; |
239 | } | |
240 | #endif /* CONFIG_CAN_CALC_BITTIMING */ | |
241 | ||
242 | /* | |
243 | * Checks the validity of the specified bit-timing parameters prop_seg, | |
244 | * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate | |
245 | * prescaler value brp. You can find more information in the header | |
246 | * file linux/can/netlink.h. | |
247 | */ | |
08da7da4 OH |
248 | static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt, |
249 | const struct can_bittiming_const *btc) | |
39549eef WG |
250 | { |
251 | struct can_priv *priv = netdev_priv(dev); | |
39549eef WG |
252 | int tseg1, alltseg; |
253 | u64 brp64; | |
254 | ||
39549eef WG |
255 | tseg1 = bt->prop_seg + bt->phase_seg1; |
256 | if (!bt->sjw) | |
257 | bt->sjw = 1; | |
258 | if (bt->sjw > btc->sjw_max || | |
259 | tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max || | |
260 | bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max) | |
261 | return -ERANGE; | |
262 | ||
263 | brp64 = (u64)priv->clock.freq * (u64)bt->tq; | |
264 | if (btc->brp_inc > 1) | |
265 | do_div(brp64, btc->brp_inc); | |
266 | brp64 += 500000000UL - 1; | |
267 | do_div(brp64, 1000000000UL); /* the practicable BRP */ | |
268 | if (btc->brp_inc > 1) | |
269 | brp64 *= btc->brp_inc; | |
270 | bt->brp = (u32)brp64; | |
271 | ||
272 | if (bt->brp < btc->brp_min || bt->brp > btc->brp_max) | |
273 | return -EINVAL; | |
274 | ||
275 | alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1; | |
276 | bt->bitrate = priv->clock.freq / (bt->brp * alltseg); | |
277 | bt->sample_point = ((tseg1 + 1) * 1000) / alltseg; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
431af779 MKB |
282 | /* Checks the validity of predefined bitrate settings */ |
283 | static int can_validate_bitrate(struct net_device *dev, struct can_bittiming *bt, | |
284 | const u32 *bitrate_const, | |
285 | const unsigned int bitrate_const_cnt) | |
286 | { | |
287 | struct can_priv *priv = netdev_priv(dev); | |
288 | unsigned int i; | |
289 | ||
290 | for (i = 0; i < bitrate_const_cnt; i++) { | |
291 | if (bt->bitrate == bitrate_const[i]) | |
292 | break; | |
293 | } | |
294 | ||
295 | if (i >= priv->bitrate_const_cnt) | |
296 | return -EINVAL; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
08da7da4 | 301 | static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, |
431af779 MKB |
302 | const struct can_bittiming_const *btc, |
303 | const u32 *bitrate_const, | |
304 | const unsigned int bitrate_const_cnt) | |
39549eef | 305 | { |
39549eef WG |
306 | int err; |
307 | ||
d5298dff OH |
308 | /* |
309 | * Depending on the given can_bittiming parameter structure the CAN | |
310 | * timing parameters are calculated based on the provided bitrate OR | |
311 | * alternatively the CAN timing parameters (tq, prop_seg, etc.) are | |
312 | * provided directly which are then checked and fixed up. | |
313 | */ | |
431af779 | 314 | if (!bt->tq && bt->bitrate && btc) |
08da7da4 | 315 | err = can_calc_bittiming(dev, bt, btc); |
431af779 | 316 | else if (bt->tq && !bt->bitrate && btc) |
08da7da4 | 317 | err = can_fixup_bittiming(dev, bt, btc); |
431af779 MKB |
318 | else if (!bt->tq && bt->bitrate && bitrate_const) |
319 | err = can_validate_bitrate(dev, bt, bitrate_const, | |
320 | bitrate_const_cnt); | |
d5298dff OH |
321 | else |
322 | err = -EINVAL; | |
39549eef | 323 | |
d5298dff | 324 | return err; |
39549eef WG |
325 | } |
326 | ||
bac78aab AY |
327 | static void can_update_state_error_stats(struct net_device *dev, |
328 | enum can_state new_state) | |
329 | { | |
330 | struct can_priv *priv = netdev_priv(dev); | |
331 | ||
332 | if (new_state <= priv->state) | |
333 | return; | |
334 | ||
335 | switch (new_state) { | |
336 | case CAN_STATE_ERROR_WARNING: | |
337 | priv->can_stats.error_warning++; | |
338 | break; | |
339 | case CAN_STATE_ERROR_PASSIVE: | |
340 | priv->can_stats.error_passive++; | |
341 | break; | |
342 | case CAN_STATE_BUS_OFF: | |
be38a6f9 AY |
343 | priv->can_stats.bus_off++; |
344 | break; | |
bac78aab AY |
345 | default: |
346 | break; | |
5b5ba2af | 347 | } |
bac78aab AY |
348 | } |
349 | ||
350 | static int can_tx_state_to_frame(struct net_device *dev, enum can_state state) | |
351 | { | |
352 | switch (state) { | |
353 | case CAN_STATE_ERROR_ACTIVE: | |
354 | return CAN_ERR_CRTL_ACTIVE; | |
355 | case CAN_STATE_ERROR_WARNING: | |
356 | return CAN_ERR_CRTL_TX_WARNING; | |
357 | case CAN_STATE_ERROR_PASSIVE: | |
358 | return CAN_ERR_CRTL_TX_PASSIVE; | |
359 | default: | |
360 | return 0; | |
361 | } | |
362 | } | |
363 | ||
364 | static int can_rx_state_to_frame(struct net_device *dev, enum can_state state) | |
365 | { | |
366 | switch (state) { | |
367 | case CAN_STATE_ERROR_ACTIVE: | |
368 | return CAN_ERR_CRTL_ACTIVE; | |
369 | case CAN_STATE_ERROR_WARNING: | |
370 | return CAN_ERR_CRTL_RX_WARNING; | |
371 | case CAN_STATE_ERROR_PASSIVE: | |
372 | return CAN_ERR_CRTL_RX_PASSIVE; | |
373 | default: | |
374 | return 0; | |
375 | } | |
376 | } | |
377 | ||
378 | void can_change_state(struct net_device *dev, struct can_frame *cf, | |
379 | enum can_state tx_state, enum can_state rx_state) | |
380 | { | |
381 | struct can_priv *priv = netdev_priv(dev); | |
382 | enum can_state new_state = max(tx_state, rx_state); | |
383 | ||
384 | if (unlikely(new_state == priv->state)) { | |
385 | netdev_warn(dev, "%s: oops, state did not change", __func__); | |
386 | return; | |
387 | } | |
388 | ||
389 | netdev_dbg(dev, "New error state: %d\n", new_state); | |
390 | ||
391 | can_update_state_error_stats(dev, new_state); | |
392 | priv->state = new_state; | |
393 | ||
ff3416fb MKB |
394 | if (!cf) |
395 | return; | |
396 | ||
bac78aab AY |
397 | if (unlikely(new_state == CAN_STATE_BUS_OFF)) { |
398 | cf->can_id |= CAN_ERR_BUSOFF; | |
399 | return; | |
400 | } | |
401 | ||
402 | cf->can_id |= CAN_ERR_CRTL; | |
403 | cf->data[1] |= tx_state >= rx_state ? | |
404 | can_tx_state_to_frame(dev, tx_state) : 0; | |
405 | cf->data[1] |= tx_state <= rx_state ? | |
406 | can_rx_state_to_frame(dev, rx_state) : 0; | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(can_change_state); | |
409 | ||
39549eef WG |
410 | /* |
411 | * Local echo of CAN messages | |
412 | * | |
413 | * CAN network devices *should* support a local echo functionality | |
414 | * (see Documentation/networking/can.txt). To test the handling of CAN | |
415 | * interfaces that do not support the local echo both driver types are | |
416 | * implemented. In the case that the driver does not support the echo | |
417 | * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core | |
418 | * to perform the echo as a fallback solution. | |
419 | */ | |
420 | static void can_flush_echo_skb(struct net_device *dev) | |
421 | { | |
422 | struct can_priv *priv = netdev_priv(dev); | |
423 | struct net_device_stats *stats = &dev->stats; | |
424 | int i; | |
425 | ||
a6e4bc53 | 426 | for (i = 0; i < priv->echo_skb_max; i++) { |
39549eef WG |
427 | if (priv->echo_skb[i]) { |
428 | kfree_skb(priv->echo_skb[i]); | |
429 | priv->echo_skb[i] = NULL; | |
430 | stats->tx_dropped++; | |
431 | stats->tx_aborted_errors++; | |
432 | } | |
433 | } | |
434 | } | |
435 | ||
436 | /* | |
437 | * Put the skb on the stack to be looped backed locally lateron | |
438 | * | |
439 | * The function is typically called in the start_xmit function | |
440 | * of the device driver. The driver must protect access to | |
441 | * priv->echo_skb, if necessary. | |
442 | */ | |
a6e4bc53 WG |
443 | void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, |
444 | unsigned int idx) | |
39549eef WG |
445 | { |
446 | struct can_priv *priv = netdev_priv(dev); | |
447 | ||
a6e4bc53 WG |
448 | BUG_ON(idx >= priv->echo_skb_max); |
449 | ||
39549eef | 450 | /* check flag whether this packet has to be looped back */ |
a94bc9c4 OH |
451 | if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK || |
452 | (skb->protocol != htons(ETH_P_CAN) && | |
453 | skb->protocol != htons(ETH_P_CANFD))) { | |
39549eef WG |
454 | kfree_skb(skb); |
455 | return; | |
456 | } | |
457 | ||
458 | if (!priv->echo_skb[idx]) { | |
39549eef | 459 | |
0ae89beb OH |
460 | skb = can_create_echo_skb(skb); |
461 | if (!skb) | |
462 | return; | |
39549eef WG |
463 | |
464 | /* make settings for echo to reduce code in irq context */ | |
39549eef WG |
465 | skb->pkt_type = PACKET_BROADCAST; |
466 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
467 | skb->dev = dev; | |
468 | ||
469 | /* save this skb for tx interrupt echo handling */ | |
470 | priv->echo_skb[idx] = skb; | |
471 | } else { | |
472 | /* locking problem with netif_stop_queue() ?? */ | |
aabdfd6a | 473 | netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__); |
39549eef WG |
474 | kfree_skb(skb); |
475 | } | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(can_put_echo_skb); | |
478 | ||
479 | /* | |
480 | * Get the skb from the stack and loop it back locally | |
481 | * | |
482 | * The function is typically called when the TX done interrupt | |
483 | * is handled in the device driver. The driver must protect | |
484 | * access to priv->echo_skb, if necessary. | |
485 | */ | |
cf5046b3 | 486 | unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) |
39549eef WG |
487 | { |
488 | struct can_priv *priv = netdev_priv(dev); | |
489 | ||
a6e4bc53 WG |
490 | BUG_ON(idx >= priv->echo_skb_max); |
491 | ||
39e3ab6f | 492 | if (priv->echo_skb[idx]) { |
cf5046b3 MKB |
493 | struct sk_buff *skb = priv->echo_skb[idx]; |
494 | struct can_frame *cf = (struct can_frame *)skb->data; | |
495 | u8 dlc = cf->can_dlc; | |
496 | ||
39549eef WG |
497 | netif_rx(priv->echo_skb[idx]); |
498 | priv->echo_skb[idx] = NULL; | |
cf5046b3 MKB |
499 | |
500 | return dlc; | |
39549eef | 501 | } |
cf5046b3 MKB |
502 | |
503 | return 0; | |
39549eef WG |
504 | } |
505 | EXPORT_SYMBOL_GPL(can_get_echo_skb); | |
506 | ||
39e3ab6f WG |
507 | /* |
508 | * Remove the skb from the stack and free it. | |
509 | * | |
510 | * The function is typically called when TX failed. | |
511 | */ | |
a6e4bc53 | 512 | void can_free_echo_skb(struct net_device *dev, unsigned int idx) |
39e3ab6f WG |
513 | { |
514 | struct can_priv *priv = netdev_priv(dev); | |
515 | ||
a6e4bc53 WG |
516 | BUG_ON(idx >= priv->echo_skb_max); |
517 | ||
39e3ab6f | 518 | if (priv->echo_skb[idx]) { |
5247a589 | 519 | dev_kfree_skb_any(priv->echo_skb[idx]); |
39e3ab6f WG |
520 | priv->echo_skb[idx] = NULL; |
521 | } | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(can_free_echo_skb); | |
524 | ||
39549eef WG |
525 | /* |
526 | * CAN device restart for bus-off recovery | |
527 | */ | |
9abefcb1 | 528 | static void can_restart(struct net_device *dev) |
39549eef | 529 | { |
39549eef WG |
530 | struct can_priv *priv = netdev_priv(dev); |
531 | struct net_device_stats *stats = &dev->stats; | |
532 | struct sk_buff *skb; | |
533 | struct can_frame *cf; | |
534 | int err; | |
535 | ||
536 | BUG_ON(netif_carrier_ok(dev)); | |
537 | ||
538 | /* | |
539 | * No synchronization needed because the device is bus-off and | |
540 | * no messages can come in or go out. | |
541 | */ | |
542 | can_flush_echo_skb(dev); | |
543 | ||
544 | /* send restart message upstream */ | |
7b6856a0 | 545 | skb = alloc_can_err_skb(dev, &cf); |
39549eef WG |
546 | if (skb == NULL) { |
547 | err = -ENOMEM; | |
b3d0df7c | 548 | goto restart; |
39549eef | 549 | } |
7b6856a0 | 550 | cf->can_id |= CAN_ERR_RESTARTED; |
39549eef WG |
551 | |
552 | netif_rx(skb); | |
553 | ||
39549eef WG |
554 | stats->rx_packets++; |
555 | stats->rx_bytes += cf->can_dlc; | |
556 | ||
b3d0df7c | 557 | restart: |
aabdfd6a | 558 | netdev_dbg(dev, "restarted\n"); |
39549eef WG |
559 | priv->can_stats.restarts++; |
560 | ||
561 | /* Now restart the device */ | |
562 | err = priv->do_set_mode(dev, CAN_MODE_START); | |
563 | ||
39549eef WG |
564 | netif_carrier_on(dev); |
565 | if (err) | |
aabdfd6a | 566 | netdev_err(dev, "Error %d during restart", err); |
39549eef WG |
567 | } |
568 | ||
9abefcb1 SM |
569 | static void can_restart_work(struct work_struct *work) |
570 | { | |
571 | struct delayed_work *dwork = to_delayed_work(work); | |
572 | struct can_priv *priv = container_of(dwork, struct can_priv, restart_work); | |
573 | ||
574 | can_restart(priv->dev); | |
575 | } | |
576 | ||
39549eef WG |
577 | int can_restart_now(struct net_device *dev) |
578 | { | |
579 | struct can_priv *priv = netdev_priv(dev); | |
580 | ||
581 | /* | |
582 | * A manual restart is only permitted if automatic restart is | |
583 | * disabled and the device is in the bus-off state | |
584 | */ | |
585 | if (priv->restart_ms) | |
586 | return -EINVAL; | |
587 | if (priv->state != CAN_STATE_BUS_OFF) | |
588 | return -EBUSY; | |
589 | ||
9abefcb1 SM |
590 | cancel_delayed_work_sync(&priv->restart_work); |
591 | can_restart(dev); | |
39549eef WG |
592 | |
593 | return 0; | |
594 | } | |
595 | ||
596 | /* | |
597 | * CAN bus-off | |
598 | * | |
599 | * This functions should be called when the device goes bus-off to | |
600 | * tell the netif layer that no more packets can be sent or received. | |
601 | * If enabled, a timer is started to trigger bus-off recovery. | |
602 | */ | |
603 | void can_bus_off(struct net_device *dev) | |
604 | { | |
605 | struct can_priv *priv = netdev_priv(dev); | |
606 | ||
aabdfd6a | 607 | netdev_dbg(dev, "bus-off\n"); |
39549eef WG |
608 | |
609 | netif_carrier_off(dev); | |
39549eef WG |
610 | |
611 | if (priv->restart_ms) | |
9abefcb1 SM |
612 | schedule_delayed_work(&priv->restart_work, |
613 | msecs_to_jiffies(priv->restart_ms)); | |
39549eef WG |
614 | } |
615 | EXPORT_SYMBOL_GPL(can_bus_off); | |
616 | ||
617 | static void can_setup(struct net_device *dev) | |
618 | { | |
619 | dev->type = ARPHRD_CAN; | |
1e0625fa | 620 | dev->mtu = CAN_MTU; |
39549eef WG |
621 | dev->hard_header_len = 0; |
622 | dev->addr_len = 0; | |
623 | dev->tx_queue_len = 10; | |
624 | ||
625 | /* New-style flags. */ | |
626 | dev->flags = IFF_NOARP; | |
34324dc2 | 627 | dev->features = NETIF_F_HW_CSUM; |
39549eef WG |
628 | } |
629 | ||
7b6856a0 WG |
630 | struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) |
631 | { | |
632 | struct sk_buff *skb; | |
633 | ||
156c2bb9 OH |
634 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + |
635 | sizeof(struct can_frame)); | |
7b6856a0 WG |
636 | if (unlikely(!skb)) |
637 | return NULL; | |
638 | ||
639 | skb->protocol = htons(ETH_P_CAN); | |
640 | skb->pkt_type = PACKET_BROADCAST; | |
641 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
156c2bb9 | 642 | |
96943901 OH |
643 | skb_reset_mac_header(skb); |
644 | skb_reset_network_header(skb); | |
645 | skb_reset_transport_header(skb); | |
646 | ||
2bf3440d OH |
647 | can_skb_reserve(skb); |
648 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 649 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 650 | |
7b6856a0 WG |
651 | *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); |
652 | memset(*cf, 0, sizeof(struct can_frame)); | |
653 | ||
654 | return skb; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(alloc_can_skb); | |
657 | ||
cb2518ca SG |
658 | struct sk_buff *alloc_canfd_skb(struct net_device *dev, |
659 | struct canfd_frame **cfd) | |
660 | { | |
661 | struct sk_buff *skb; | |
662 | ||
663 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + | |
664 | sizeof(struct canfd_frame)); | |
665 | if (unlikely(!skb)) | |
666 | return NULL; | |
667 | ||
668 | skb->protocol = htons(ETH_P_CANFD); | |
669 | skb->pkt_type = PACKET_BROADCAST; | |
670 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
671 | ||
96943901 OH |
672 | skb_reset_mac_header(skb); |
673 | skb_reset_network_header(skb); | |
674 | skb_reset_transport_header(skb); | |
675 | ||
cb2518ca SG |
676 | can_skb_reserve(skb); |
677 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 678 | can_skb_prv(skb)->skbcnt = 0; |
cb2518ca SG |
679 | |
680 | *cfd = (struct canfd_frame *)skb_put(skb, sizeof(struct canfd_frame)); | |
681 | memset(*cfd, 0, sizeof(struct canfd_frame)); | |
682 | ||
683 | return skb; | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(alloc_canfd_skb); | |
686 | ||
7b6856a0 WG |
687 | struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) |
688 | { | |
689 | struct sk_buff *skb; | |
690 | ||
691 | skb = alloc_can_skb(dev, cf); | |
692 | if (unlikely(!skb)) | |
693 | return NULL; | |
694 | ||
695 | (*cf)->can_id = CAN_ERR_FLAG; | |
696 | (*cf)->can_dlc = CAN_ERR_DLC; | |
697 | ||
698 | return skb; | |
699 | } | |
700 | EXPORT_SYMBOL_GPL(alloc_can_err_skb); | |
701 | ||
39549eef WG |
702 | /* |
703 | * Allocate and setup space for the CAN network device | |
704 | */ | |
a6e4bc53 | 705 | struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max) |
39549eef WG |
706 | { |
707 | struct net_device *dev; | |
708 | struct can_priv *priv; | |
a6e4bc53 | 709 | int size; |
39549eef | 710 | |
a6e4bc53 WG |
711 | if (echo_skb_max) |
712 | size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) + | |
713 | echo_skb_max * sizeof(struct sk_buff *); | |
714 | else | |
715 | size = sizeof_priv; | |
716 | ||
c835a677 | 717 | dev = alloc_netdev(size, "can%d", NET_NAME_UNKNOWN, can_setup); |
39549eef WG |
718 | if (!dev) |
719 | return NULL; | |
720 | ||
721 | priv = netdev_priv(dev); | |
9abefcb1 | 722 | priv->dev = dev; |
39549eef | 723 | |
a6e4bc53 WG |
724 | if (echo_skb_max) { |
725 | priv->echo_skb_max = echo_skb_max; | |
726 | priv->echo_skb = (void *)priv + | |
727 | ALIGN(sizeof_priv, sizeof(struct sk_buff *)); | |
728 | } | |
729 | ||
39549eef WG |
730 | priv->state = CAN_STATE_STOPPED; |
731 | ||
9abefcb1 | 732 | INIT_DELAYED_WORK(&priv->restart_work, can_restart_work); |
39549eef WG |
733 | |
734 | return dev; | |
735 | } | |
736 | EXPORT_SYMBOL_GPL(alloc_candev); | |
737 | ||
738 | /* | |
739 | * Free space of the CAN network device | |
740 | */ | |
741 | void free_candev(struct net_device *dev) | |
742 | { | |
743 | free_netdev(dev); | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(free_candev); | |
746 | ||
bc05a894 OH |
747 | /* |
748 | * changing MTU and control mode for CAN/CANFD devices | |
749 | */ | |
750 | int can_change_mtu(struct net_device *dev, int new_mtu) | |
751 | { | |
752 | struct can_priv *priv = netdev_priv(dev); | |
753 | ||
754 | /* Do not allow changing the MTU while running */ | |
755 | if (dev->flags & IFF_UP) | |
756 | return -EBUSY; | |
757 | ||
758 | /* allow change of MTU according to the CANFD ability of the device */ | |
759 | switch (new_mtu) { | |
760 | case CAN_MTU: | |
bb208f14 OH |
761 | /* 'CANFD-only' controllers can not switch to CAN_MTU */ |
762 | if (priv->ctrlmode_static & CAN_CTRLMODE_FD) | |
763 | return -EINVAL; | |
764 | ||
bc05a894 OH |
765 | priv->ctrlmode &= ~CAN_CTRLMODE_FD; |
766 | break; | |
767 | ||
768 | case CANFD_MTU: | |
bb208f14 OH |
769 | /* check for potential CANFD ability */ |
770 | if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) && | |
771 | !(priv->ctrlmode_static & CAN_CTRLMODE_FD)) | |
bc05a894 OH |
772 | return -EINVAL; |
773 | ||
774 | priv->ctrlmode |= CAN_CTRLMODE_FD; | |
775 | break; | |
776 | ||
777 | default: | |
778 | return -EINVAL; | |
779 | } | |
780 | ||
781 | dev->mtu = new_mtu; | |
782 | return 0; | |
783 | } | |
784 | EXPORT_SYMBOL_GPL(can_change_mtu); | |
785 | ||
39549eef WG |
786 | /* |
787 | * Common open function when the device gets opened. | |
788 | * | |
789 | * This function should be called in the open function of the device | |
790 | * driver. | |
791 | */ | |
792 | int open_candev(struct net_device *dev) | |
793 | { | |
794 | struct can_priv *priv = netdev_priv(dev); | |
795 | ||
b30749fd | 796 | if (!priv->bittiming.bitrate) { |
aabdfd6a | 797 | netdev_err(dev, "bit-timing not yet defined\n"); |
39549eef WG |
798 | return -EINVAL; |
799 | } | |
800 | ||
dd22586d OH |
801 | /* For CAN FD the data bitrate has to be >= the arbitration bitrate */ |
802 | if ((priv->ctrlmode & CAN_CTRLMODE_FD) && | |
803 | (!priv->data_bittiming.bitrate || | |
804 | (priv->data_bittiming.bitrate < priv->bittiming.bitrate))) { | |
805 | netdev_err(dev, "incorrect/missing data bit-timing\n"); | |
806 | return -EINVAL; | |
807 | } | |
808 | ||
1b0d9224 WG |
809 | /* Switch carrier on if device was stopped while in bus-off state */ |
810 | if (!netif_carrier_ok(dev)) | |
811 | netif_carrier_on(dev); | |
812 | ||
39549eef WG |
813 | return 0; |
814 | } | |
128ced8f | 815 | EXPORT_SYMBOL_GPL(open_candev); |
39549eef WG |
816 | |
817 | /* | |
818 | * Common close function for cleanup before the device gets closed. | |
819 | * | |
820 | * This function should be called in the close function of the device | |
821 | * driver. | |
822 | */ | |
823 | void close_candev(struct net_device *dev) | |
824 | { | |
825 | struct can_priv *priv = netdev_priv(dev); | |
826 | ||
9abefcb1 | 827 | cancel_delayed_work_sync(&priv->restart_work); |
39549eef WG |
828 | can_flush_echo_skb(dev); |
829 | } | |
830 | EXPORT_SYMBOL_GPL(close_candev); | |
831 | ||
832 | /* | |
833 | * CAN netlink interface | |
834 | */ | |
835 | static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { | |
836 | [IFLA_CAN_STATE] = { .type = NLA_U32 }, | |
837 | [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) }, | |
838 | [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 }, | |
839 | [IFLA_CAN_RESTART] = { .type = NLA_U32 }, | |
840 | [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) }, | |
841 | [IFLA_CAN_BITTIMING_CONST] | |
842 | = { .len = sizeof(struct can_bittiming_const) }, | |
843 | [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) }, | |
52c793f2 | 844 | [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) }, |
9859ccd2 OH |
845 | [IFLA_CAN_DATA_BITTIMING] |
846 | = { .len = sizeof(struct can_bittiming) }, | |
847 | [IFLA_CAN_DATA_BITTIMING_CONST] | |
848 | = { .len = sizeof(struct can_bittiming_const) }, | |
39549eef WG |
849 | }; |
850 | ||
bb208f14 OH |
851 | static int can_validate(struct nlattr *tb[], struct nlattr *data[]) |
852 | { | |
853 | bool is_can_fd = false; | |
854 | ||
855 | /* Make sure that valid CAN FD configurations always consist of | |
856 | * - nominal/arbitration bittiming | |
857 | * - data bittiming | |
858 | * - control mode with CAN_CTRLMODE_FD set | |
859 | */ | |
860 | ||
bce271f2 OH |
861 | if (!data) |
862 | return 0; | |
863 | ||
bb208f14 OH |
864 | if (data[IFLA_CAN_CTRLMODE]) { |
865 | struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
866 | ||
867 | is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD; | |
868 | } | |
869 | ||
870 | if (is_can_fd) { | |
871 | if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING]) | |
872 | return -EOPNOTSUPP; | |
873 | } | |
874 | ||
875 | if (data[IFLA_CAN_DATA_BITTIMING]) { | |
876 | if (!is_can_fd || !data[IFLA_CAN_BITTIMING]) | |
877 | return -EOPNOTSUPP; | |
878 | } | |
879 | ||
880 | return 0; | |
881 | } | |
882 | ||
39549eef WG |
883 | static int can_changelink(struct net_device *dev, |
884 | struct nlattr *tb[], struct nlattr *data[]) | |
885 | { | |
886 | struct can_priv *priv = netdev_priv(dev); | |
887 | int err; | |
888 | ||
889 | /* We need synchronization with dev->stop() */ | |
890 | ASSERT_RTNL(); | |
891 | ||
39549eef WG |
892 | if (data[IFLA_CAN_BITTIMING]) { |
893 | struct can_bittiming bt; | |
894 | ||
895 | /* Do not allow changing bittiming while running */ | |
896 | if (dev->flags & IFF_UP) | |
897 | return -EBUSY; | |
c3606d43 MKB |
898 | |
899 | /* Calculate bittiming parameters based on | |
900 | * bittiming_const if set, otherwise pass bitrate | |
901 | * directly via do_set_bitrate(). Bail out if neither | |
902 | * is given. | |
903 | */ | |
904 | if (!priv->bittiming_const && !priv->do_set_bittiming) | |
905 | return -EOPNOTSUPP; | |
906 | ||
39549eef | 907 | memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); |
431af779 MKB |
908 | err = can_get_bittiming(dev, &bt, |
909 | priv->bittiming_const, | |
910 | priv->bitrate_const, | |
911 | priv->bitrate_const_cnt); | |
912 | if (err) | |
913 | return err; | |
39549eef WG |
914 | memcpy(&priv->bittiming, &bt, sizeof(bt)); |
915 | ||
916 | if (priv->do_set_bittiming) { | |
917 | /* Finally, set the bit-timing registers */ | |
918 | err = priv->do_set_bittiming(dev); | |
919 | if (err) | |
920 | return err; | |
921 | } | |
922 | } | |
923 | ||
49cb5c0e MKB |
924 | if (data[IFLA_CAN_CTRLMODE]) { |
925 | struct can_ctrlmode *cm; | |
bb208f14 OH |
926 | u32 ctrlstatic; |
927 | u32 maskedflags; | |
49cb5c0e MKB |
928 | |
929 | /* Do not allow changing controller mode while running */ | |
930 | if (dev->flags & IFF_UP) | |
931 | return -EBUSY; | |
932 | cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
bb208f14 OH |
933 | ctrlstatic = priv->ctrlmode_static; |
934 | maskedflags = cm->flags & cm->mask; | |
935 | ||
936 | /* check whether provided bits are allowed to be passed */ | |
937 | if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic)) | |
938 | return -EOPNOTSUPP; | |
939 | ||
940 | /* do not check for static fd-non-iso if 'fd' is disabled */ | |
941 | if (!(maskedflags & CAN_CTRLMODE_FD)) | |
942 | ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; | |
9b1087aa | 943 | |
bb208f14 OH |
944 | /* make sure static options are provided by configuration */ |
945 | if ((maskedflags & ctrlstatic) != ctrlstatic) | |
49cb5c0e | 946 | return -EOPNOTSUPP; |
9b1087aa OH |
947 | |
948 | /* clear bits to be modified and copy the flag values */ | |
49cb5c0e | 949 | priv->ctrlmode &= ~cm->mask; |
bb208f14 | 950 | priv->ctrlmode |= maskedflags; |
bc05a894 OH |
951 | |
952 | /* CAN_CTRLMODE_FD can only be set when driver supports FD */ | |
953 | if (priv->ctrlmode & CAN_CTRLMODE_FD) | |
954 | dev->mtu = CANFD_MTU; | |
955 | else | |
956 | dev->mtu = CAN_MTU; | |
49cb5c0e MKB |
957 | } |
958 | ||
39549eef WG |
959 | if (data[IFLA_CAN_RESTART_MS]) { |
960 | /* Do not allow changing restart delay while running */ | |
961 | if (dev->flags & IFF_UP) | |
962 | return -EBUSY; | |
963 | priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); | |
964 | } | |
965 | ||
966 | if (data[IFLA_CAN_RESTART]) { | |
967 | /* Do not allow a restart while not running */ | |
968 | if (!(dev->flags & IFF_UP)) | |
969 | return -EINVAL; | |
970 | err = can_restart_now(dev); | |
971 | if (err) | |
972 | return err; | |
973 | } | |
974 | ||
9859ccd2 OH |
975 | if (data[IFLA_CAN_DATA_BITTIMING]) { |
976 | struct can_bittiming dbt; | |
977 | ||
978 | /* Do not allow changing bittiming while running */ | |
979 | if (dev->flags & IFF_UP) | |
980 | return -EBUSY; | |
c3606d43 MKB |
981 | |
982 | /* Calculate bittiming parameters based on | |
983 | * data_bittiming_const if set, otherwise pass bitrate | |
984 | * directly via do_set_bitrate(). Bail out if neither | |
985 | * is given. | |
986 | */ | |
987 | if (!priv->data_bittiming_const && !priv->do_set_data_bittiming) | |
988 | return -EOPNOTSUPP; | |
989 | ||
9859ccd2 OH |
990 | memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), |
991 | sizeof(dbt)); | |
431af779 MKB |
992 | err = can_get_bittiming(dev, &dbt, |
993 | priv->data_bittiming_const, | |
994 | priv->data_bitrate_const, | |
995 | priv->data_bitrate_const_cnt); | |
996 | if (err) | |
997 | return err; | |
9859ccd2 OH |
998 | memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); |
999 | ||
1000 | if (priv->do_set_data_bittiming) { | |
1001 | /* Finally, set the bit-timing registers */ | |
1002 | err = priv->do_set_data_bittiming(dev); | |
1003 | if (err) | |
1004 | return err; | |
1005 | } | |
1006 | } | |
1007 | ||
12a6075c OH |
1008 | if (data[IFLA_CAN_TERMINATION]) { |
1009 | const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]); | |
1010 | const unsigned int num_term = priv->termination_const_cnt; | |
1011 | unsigned int i; | |
1012 | ||
1013 | if (!priv->do_set_termination) | |
1014 | return -EOPNOTSUPP; | |
1015 | ||
1016 | /* check whether given value is supported by the interface */ | |
1017 | for (i = 0; i < num_term; i++) { | |
1018 | if (termval == priv->termination_const[i]) | |
1019 | break; | |
1020 | } | |
1021 | if (i >= num_term) | |
1022 | return -EINVAL; | |
1023 | ||
1024 | /* Finally, set the termination value */ | |
1025 | err = priv->do_set_termination(dev, termval); | |
1026 | if (err) | |
1027 | return err; | |
1028 | ||
1029 | priv->termination = termval; | |
1030 | } | |
1031 | ||
39549eef WG |
1032 | return 0; |
1033 | } | |
1034 | ||
53a0ef86 WG |
1035 | static size_t can_get_size(const struct net_device *dev) |
1036 | { | |
1037 | struct can_priv *priv = netdev_priv(dev); | |
c13c64d8 MKB |
1038 | size_t size = 0; |
1039 | ||
b30749fd OH |
1040 | if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ |
1041 | size += nla_total_size(sizeof(struct can_bittiming)); | |
c13c64d8 | 1042 | if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ |
fe119a05 | 1043 | size += nla_total_size(sizeof(struct can_bittiming_const)); |
c13c64d8 MKB |
1044 | size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ |
1045 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ | |
1046 | size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ | |
1047 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ | |
1048 | if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ | |
1049 | size += nla_total_size(sizeof(struct can_berr_counter)); | |
9859ccd2 OH |
1050 | if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */ |
1051 | size += nla_total_size(sizeof(struct can_bittiming)); | |
1052 | if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */ | |
1053 | size += nla_total_size(sizeof(struct can_bittiming_const)); | |
12a6075c OH |
1054 | if (priv->termination_const) { |
1055 | size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */ | |
1056 | size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */ | |
1057 | priv->termination_const_cnt); | |
1058 | } | |
431af779 MKB |
1059 | if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */ |
1060 | size += nla_total_size(sizeof(*priv->bitrate_const) * | |
1061 | priv->bitrate_const_cnt); | |
1062 | if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */ | |
1063 | size += nla_total_size(sizeof(*priv->data_bitrate_const) * | |
1064 | priv->data_bitrate_const_cnt); | |
53a0ef86 WG |
1065 | |
1066 | return size; | |
1067 | } | |
1068 | ||
39549eef WG |
1069 | static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) |
1070 | { | |
1071 | struct can_priv *priv = netdev_priv(dev); | |
1072 | struct can_ctrlmode cm = {.flags = priv->ctrlmode}; | |
52c793f2 | 1073 | struct can_berr_counter bec; |
39549eef WG |
1074 | enum can_state state = priv->state; |
1075 | ||
1076 | if (priv->do_get_state) | |
1077 | priv->do_get_state(dev, &state); | |
9859ccd2 | 1078 | |
b30749fd OH |
1079 | if ((priv->bittiming.bitrate && |
1080 | nla_put(skb, IFLA_CAN_BITTIMING, | |
1081 | sizeof(priv->bittiming), &priv->bittiming)) || | |
9859ccd2 | 1082 | |
57a59b9e MKB |
1083 | (priv->bittiming_const && |
1084 | nla_put(skb, IFLA_CAN_BITTIMING_CONST, | |
1085 | sizeof(*priv->bittiming_const), priv->bittiming_const)) || | |
9859ccd2 | 1086 | |
562b103a | 1087 | nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) || |
57a59b9e MKB |
1088 | nla_put_u32(skb, IFLA_CAN_STATE, state) || |
1089 | nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || | |
1090 | nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || | |
9859ccd2 | 1091 | |
31e0e328 DM |
1092 | (priv->do_get_berr_counter && |
1093 | !priv->do_get_berr_counter(dev, &bec) && | |
9859ccd2 OH |
1094 | nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || |
1095 | ||
1096 | (priv->data_bittiming.bitrate && | |
1097 | nla_put(skb, IFLA_CAN_DATA_BITTIMING, | |
1098 | sizeof(priv->data_bittiming), &priv->data_bittiming)) || | |
1099 | ||
1100 | (priv->data_bittiming_const && | |
1101 | nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST, | |
1102 | sizeof(*priv->data_bittiming_const), | |
12a6075c OH |
1103 | priv->data_bittiming_const)) || |
1104 | ||
1105 | (priv->termination_const && | |
1106 | (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) || | |
1107 | nla_put(skb, IFLA_CAN_TERMINATION_CONST, | |
1108 | sizeof(*priv->termination_const) * | |
1109 | priv->termination_const_cnt, | |
431af779 MKB |
1110 | priv->termination_const))) || |
1111 | ||
1112 | (priv->bitrate_const && | |
1113 | nla_put(skb, IFLA_CAN_BITRATE_CONST, | |
1114 | sizeof(*priv->bitrate_const) * | |
1115 | priv->bitrate_const_cnt, | |
1116 | priv->bitrate_const)) || | |
1117 | ||
1118 | (priv->data_bitrate_const && | |
1119 | nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST, | |
1120 | sizeof(*priv->data_bitrate_const) * | |
1121 | priv->data_bitrate_const_cnt, | |
1122 | priv->data_bitrate_const)) | |
1123 | ) | |
12a6075c | 1124 | |
57a59b9e | 1125 | return -EMSGSIZE; |
9859ccd2 | 1126 | |
39549eef | 1127 | return 0; |
39549eef WG |
1128 | } |
1129 | ||
55369c0a WG |
1130 | static size_t can_get_xstats_size(const struct net_device *dev) |
1131 | { | |
1132 | return sizeof(struct can_device_stats); | |
1133 | } | |
1134 | ||
39549eef WG |
1135 | static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) |
1136 | { | |
1137 | struct can_priv *priv = netdev_priv(dev); | |
1138 | ||
31e0e328 DM |
1139 | if (nla_put(skb, IFLA_INFO_XSTATS, |
1140 | sizeof(priv->can_stats), &priv->can_stats)) | |
1141 | goto nla_put_failure; | |
39549eef WG |
1142 | return 0; |
1143 | ||
1144 | nla_put_failure: | |
1145 | return -EMSGSIZE; | |
1146 | } | |
1147 | ||
81adee47 | 1148 | static int can_newlink(struct net *src_net, struct net_device *dev, |
993e6f2f OH |
1149 | struct nlattr *tb[], struct nlattr *data[]) |
1150 | { | |
1151 | return -EOPNOTSUPP; | |
1152 | } | |
1153 | ||
25e1ed6e OH |
1154 | static void can_dellink(struct net_device *dev, struct list_head *head) |
1155 | { | |
1156 | return; | |
1157 | } | |
1158 | ||
39549eef WG |
1159 | static struct rtnl_link_ops can_link_ops __read_mostly = { |
1160 | .kind = "can", | |
1161 | .maxtype = IFLA_CAN_MAX, | |
1162 | .policy = can_policy, | |
1163 | .setup = can_setup, | |
bb208f14 | 1164 | .validate = can_validate, |
993e6f2f | 1165 | .newlink = can_newlink, |
39549eef | 1166 | .changelink = can_changelink, |
25e1ed6e | 1167 | .dellink = can_dellink, |
53a0ef86 | 1168 | .get_size = can_get_size, |
39549eef | 1169 | .fill_info = can_fill_info, |
55369c0a | 1170 | .get_xstats_size = can_get_xstats_size, |
39549eef WG |
1171 | .fill_xstats = can_fill_xstats, |
1172 | }; | |
1173 | ||
1174 | /* | |
1175 | * Register the CAN network device | |
1176 | */ | |
1177 | int register_candev(struct net_device *dev) | |
1178 | { | |
12a6075c OH |
1179 | struct can_priv *priv = netdev_priv(dev); |
1180 | ||
1181 | /* Ensure termination_const, termination_const_cnt and | |
1182 | * do_set_termination consistency. All must be either set or | |
1183 | * unset. | |
1184 | */ | |
1185 | if ((!priv->termination_const != !priv->termination_const_cnt) || | |
1186 | (!priv->termination_const != !priv->do_set_termination)) | |
1187 | return -EINVAL; | |
1188 | ||
431af779 MKB |
1189 | if (!priv->bitrate_const != !priv->bitrate_const_cnt) |
1190 | return -EINVAL; | |
1191 | ||
1192 | if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt) | |
1193 | return -EINVAL; | |
1194 | ||
39549eef WG |
1195 | dev->rtnl_link_ops = &can_link_ops; |
1196 | return register_netdev(dev); | |
1197 | } | |
1198 | EXPORT_SYMBOL_GPL(register_candev); | |
1199 | ||
1200 | /* | |
1201 | * Unregister the CAN network device | |
1202 | */ | |
1203 | void unregister_candev(struct net_device *dev) | |
1204 | { | |
1205 | unregister_netdev(dev); | |
1206 | } | |
1207 | EXPORT_SYMBOL_GPL(unregister_candev); | |
1208 | ||
bf03a537 KVD |
1209 | /* |
1210 | * Test if a network device is a candev based device | |
1211 | * and return the can_priv* if so. | |
1212 | */ | |
1213 | struct can_priv *safe_candev_priv(struct net_device *dev) | |
1214 | { | |
1215 | if ((dev->type != ARPHRD_CAN) || (dev->rtnl_link_ops != &can_link_ops)) | |
1216 | return NULL; | |
1217 | ||
1218 | return netdev_priv(dev); | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(safe_candev_priv); | |
1221 | ||
39549eef WG |
1222 | static __init int can_dev_init(void) |
1223 | { | |
1224 | int err; | |
1225 | ||
a1ef7bd9 KVD |
1226 | can_led_notifier_init(); |
1227 | ||
39549eef WG |
1228 | err = rtnl_link_register(&can_link_ops); |
1229 | if (!err) | |
1230 | printk(KERN_INFO MOD_DESC "\n"); | |
1231 | ||
1232 | return err; | |
1233 | } | |
1234 | module_init(can_dev_init); | |
1235 | ||
1236 | static __exit void can_dev_exit(void) | |
1237 | { | |
1238 | rtnl_link_unregister(&can_link_ops); | |
a1ef7bd9 KVD |
1239 | |
1240 | can_led_notifier_exit(); | |
39549eef WG |
1241 | } |
1242 | module_exit(can_dev_exit); | |
1243 | ||
1244 | MODULE_ALIAS_RTNL_LINK("can"); |