Commit | Line | Data |
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35e62ae8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ee9a5f5e | 2 | /* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix |
39549eef WG |
3 | * Copyright (C) 2006 Andrey Volkov, Varma Electronics |
4 | * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> | |
39549eef WG |
5 | */ |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/kernel.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
39549eef WG |
10 | #include <linux/netdevice.h> |
11 | #include <linux/if_arp.h> | |
9abefcb1 | 12 | #include <linux/workqueue.h> |
39549eef | 13 | #include <linux/can.h> |
ffd956ee | 14 | #include <linux/can/can-ml.h> |
39549eef | 15 | #include <linux/can/dev.h> |
156c2bb9 | 16 | #include <linux/can/skb.h> |
39549eef | 17 | #include <linux/can/netlink.h> |
a1ef7bd9 | 18 | #include <linux/can/led.h> |
2290aefa | 19 | #include <linux/of.h> |
39549eef WG |
20 | #include <net/rtnetlink.h> |
21 | ||
22 | #define MOD_DESC "CAN device driver interface" | |
23 | ||
24 | MODULE_DESCRIPTION(MOD_DESC); | |
25 | MODULE_LICENSE("GPL v2"); | |
26 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
27 | ||
1e0625fa OH |
28 | /* CAN DLC to real data length conversion helpers */ |
29 | ||
30 | static const u8 dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7, | |
31 | 8, 12, 16, 20, 24, 32, 48, 64}; | |
32 | ||
33 | /* get data length from can_dlc with sanitized can_dlc */ | |
34 | u8 can_dlc2len(u8 can_dlc) | |
35 | { | |
36 | return dlc2len[can_dlc & 0x0F]; | |
37 | } | |
38 | EXPORT_SYMBOL_GPL(can_dlc2len); | |
39 | ||
40 | static const u8 len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */ | |
41 | 9, 9, 9, 9, /* 9 - 12 */ | |
42 | 10, 10, 10, 10, /* 13 - 16 */ | |
43 | 11, 11, 11, 11, /* 17 - 20 */ | |
44 | 12, 12, 12, 12, /* 21 - 24 */ | |
45 | 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */ | |
46 | 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */ | |
47 | 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */ | |
48 | 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */ | |
49 | 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */ | |
50 | ||
51 | /* map the sanitized data length to an appropriate data length code */ | |
52 | u8 can_len2dlc(u8 len) | |
53 | { | |
54 | if (unlikely(len > 64)) | |
55 | return 0xF; | |
56 | ||
57 | return len2dlc[len]; | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(can_len2dlc); | |
60 | ||
39549eef WG |
61 | #ifdef CONFIG_CAN_CALC_BITTIMING |
62 | #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */ | |
7da29f97 | 63 | #define CAN_CALC_SYNC_SEG 1 |
39549eef | 64 | |
ee9a5f5e | 65 | /* Bit-timing calculation derived from: |
39549eef WG |
66 | * |
67 | * Code based on LinCAN sources and H8S2638 project | |
68 | * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz | |
69 | * Copyright 2005 Stanislav Marek | |
70 | * email: pisa@cmp.felk.cvut.cz | |
71 | * | |
72 | * Calculates proper bit-timing parameters for a specified bit-rate | |
73 | * and sample-point, which can then be used to set the bit-timing | |
74 | * registers of the CAN controller. You can find more information | |
75 | * in the header file linux/can/netlink.h. | |
76 | */ | |
d7bda730 MKB |
77 | static int |
78 | can_update_sample_point(const struct can_bittiming_const *btc, | |
79 | unsigned int sample_point_nominal, unsigned int tseg, | |
80 | unsigned int *tseg1_ptr, unsigned int *tseg2_ptr, | |
81 | unsigned int *sample_point_error_ptr) | |
39549eef | 82 | { |
7da29f97 MKB |
83 | unsigned int sample_point_error, best_sample_point_error = UINT_MAX; |
84 | unsigned int sample_point, best_sample_point = 0; | |
85 | unsigned int tseg1, tseg2; | |
86 | int i; | |
87 | ||
88 | for (i = 0; i <= 1; i++) { | |
d7bda730 MKB |
89 | tseg2 = tseg + CAN_CALC_SYNC_SEG - |
90 | (sample_point_nominal * (tseg + CAN_CALC_SYNC_SEG)) / | |
91 | 1000 - i; | |
7da29f97 MKB |
92 | tseg2 = clamp(tseg2, btc->tseg2_min, btc->tseg2_max); |
93 | tseg1 = tseg - tseg2; | |
94 | if (tseg1 > btc->tseg1_max) { | |
95 | tseg1 = btc->tseg1_max; | |
96 | tseg2 = tseg - tseg1; | |
97 | } | |
98 | ||
d7bda730 MKB |
99 | sample_point = 1000 * (tseg + CAN_CALC_SYNC_SEG - tseg2) / |
100 | (tseg + CAN_CALC_SYNC_SEG); | |
7da29f97 MKB |
101 | sample_point_error = abs(sample_point_nominal - sample_point); |
102 | ||
39fe6fd5 MKB |
103 | if (sample_point <= sample_point_nominal && |
104 | sample_point_error < best_sample_point_error) { | |
7da29f97 MKB |
105 | best_sample_point = sample_point; |
106 | best_sample_point_error = sample_point_error; | |
107 | *tseg1_ptr = tseg1; | |
108 | *tseg2_ptr = tseg2; | |
109 | } | |
39549eef | 110 | } |
7da29f97 MKB |
111 | |
112 | if (sample_point_error_ptr) | |
113 | *sample_point_error_ptr = best_sample_point_error; | |
114 | ||
115 | return best_sample_point; | |
39549eef WG |
116 | } |
117 | ||
08da7da4 OH |
118 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
119 | const struct can_bittiming_const *btc) | |
39549eef WG |
120 | { |
121 | struct can_priv *priv = netdev_priv(dev); | |
7da29f97 MKB |
122 | unsigned int bitrate; /* current bitrate */ |
123 | unsigned int bitrate_error; /* difference between current and nominal value */ | |
124 | unsigned int best_bitrate_error = UINT_MAX; | |
125 | unsigned int sample_point_error; /* difference between current and nominal value */ | |
126 | unsigned int best_sample_point_error = UINT_MAX; | |
127 | unsigned int sample_point_nominal; /* nominal sample point */ | |
128 | unsigned int best_tseg = 0; /* current best value for tseg */ | |
129 | unsigned int best_brp = 0; /* current best value for brp */ | |
130 | unsigned int brp, tsegall, tseg, tseg1 = 0, tseg2 = 0; | |
39549eef WG |
131 | u64 v64; |
132 | ||
67b5909e | 133 | /* Use CiA recommended sample points */ |
39549eef | 134 | if (bt->sample_point) { |
7da29f97 | 135 | sample_point_nominal = bt->sample_point; |
39549eef WG |
136 | } else { |
137 | if (bt->bitrate > 800000) | |
7da29f97 | 138 | sample_point_nominal = 750; |
39549eef | 139 | else if (bt->bitrate > 500000) |
7da29f97 | 140 | sample_point_nominal = 800; |
39549eef | 141 | else |
7da29f97 | 142 | sample_point_nominal = 875; |
39549eef WG |
143 | } |
144 | ||
145 | /* tseg even = round down, odd = round up */ | |
146 | for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1; | |
147 | tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) { | |
7da29f97 MKB |
148 | tsegall = CAN_CALC_SYNC_SEG + tseg / 2; |
149 | ||
39549eef WG |
150 | /* Compute all possible tseg choices (tseg=tseg1+tseg2) */ |
151 | brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2; | |
7da29f97 MKB |
152 | |
153 | /* choose brp step which is possible in system */ | |
39549eef | 154 | brp = (brp / btc->brp_inc) * btc->brp_inc; |
39fe6fd5 | 155 | if (brp < btc->brp_min || brp > btc->brp_max) |
39549eef | 156 | continue; |
7da29f97 MKB |
157 | |
158 | bitrate = priv->clock.freq / (brp * tsegall); | |
159 | bitrate_error = abs(bt->bitrate - bitrate); | |
160 | ||
39549eef | 161 | /* tseg brp biterror */ |
7da29f97 | 162 | if (bitrate_error > best_bitrate_error) |
39549eef | 163 | continue; |
7da29f97 MKB |
164 | |
165 | /* reset sample point error if we have a better bitrate */ | |
166 | if (bitrate_error < best_bitrate_error) | |
167 | best_sample_point_error = UINT_MAX; | |
168 | ||
d7bda730 MKB |
169 | can_update_sample_point(btc, sample_point_nominal, tseg / 2, |
170 | &tseg1, &tseg2, &sample_point_error); | |
7da29f97 MKB |
171 | if (sample_point_error > best_sample_point_error) |
172 | continue; | |
173 | ||
174 | best_sample_point_error = sample_point_error; | |
175 | best_bitrate_error = bitrate_error; | |
39549eef WG |
176 | best_tseg = tseg / 2; |
177 | best_brp = brp; | |
7da29f97 MKB |
178 | |
179 | if (bitrate_error == 0 && sample_point_error == 0) | |
39549eef WG |
180 | break; |
181 | } | |
182 | ||
7da29f97 | 183 | if (best_bitrate_error) { |
39549eef | 184 | /* Error in one-tenth of a percent */ |
7da29f97 MKB |
185 | v64 = (u64)best_bitrate_error * 1000; |
186 | do_div(v64, bt->bitrate); | |
187 | bitrate_error = (u32)v64; | |
188 | if (bitrate_error > CAN_CALC_MAX_ERROR) { | |
aabdfd6a | 189 | netdev_err(dev, |
7da29f97 MKB |
190 | "bitrate error %d.%d%% too high\n", |
191 | bitrate_error / 10, bitrate_error % 10); | |
39549eef | 192 | return -EDOM; |
39549eef | 193 | } |
7da29f97 MKB |
194 | netdev_warn(dev, "bitrate error %d.%d%%\n", |
195 | bitrate_error / 10, bitrate_error % 10); | |
39549eef WG |
196 | } |
197 | ||
198 | /* real sample point */ | |
d7bda730 MKB |
199 | bt->sample_point = can_update_sample_point(btc, sample_point_nominal, |
200 | best_tseg, &tseg1, &tseg2, | |
201 | NULL); | |
39549eef | 202 | |
7da29f97 | 203 | v64 = (u64)best_brp * 1000 * 1000 * 1000; |
39549eef WG |
204 | do_div(v64, priv->clock.freq); |
205 | bt->tq = (u32)v64; | |
206 | bt->prop_seg = tseg1 / 2; | |
207 | bt->phase_seg1 = tseg1 - bt->prop_seg; | |
208 | bt->phase_seg2 = tseg2; | |
2e114374 OH |
209 | |
210 | /* check for sjw user settings */ | |
7da29f97 | 211 | if (!bt->sjw || !btc->sjw_max) { |
2e114374 | 212 | bt->sjw = 1; |
7da29f97 | 213 | } else { |
2e114374 OH |
214 | /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */ |
215 | if (bt->sjw > btc->sjw_max) | |
216 | bt->sjw = btc->sjw_max; | |
217 | /* bt->sjw must not be higher than tseg2 */ | |
218 | if (tseg2 < bt->sjw) | |
219 | bt->sjw = tseg2; | |
220 | } | |
221 | ||
39549eef | 222 | bt->brp = best_brp; |
7da29f97 MKB |
223 | |
224 | /* real bitrate */ | |
d7bda730 MKB |
225 | bt->bitrate = priv->clock.freq / |
226 | (bt->brp * (CAN_CALC_SYNC_SEG + tseg1 + tseg2)); | |
39549eef WG |
227 | |
228 | return 0; | |
229 | } | |
230 | #else /* !CONFIG_CAN_CALC_BITTIMING */ | |
08da7da4 OH |
231 | static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt, |
232 | const struct can_bittiming_const *btc) | |
39549eef | 233 | { |
aabdfd6a | 234 | netdev_err(dev, "bit-timing calculation not available\n"); |
39549eef WG |
235 | return -EINVAL; |
236 | } | |
237 | #endif /* CONFIG_CAN_CALC_BITTIMING */ | |
238 | ||
ee9a5f5e | 239 | /* Checks the validity of the specified bit-timing parameters prop_seg, |
39549eef WG |
240 | * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate |
241 | * prescaler value brp. You can find more information in the header | |
242 | * file linux/can/netlink.h. | |
243 | */ | |
08da7da4 OH |
244 | static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt, |
245 | const struct can_bittiming_const *btc) | |
39549eef WG |
246 | { |
247 | struct can_priv *priv = netdev_priv(dev); | |
39549eef WG |
248 | int tseg1, alltseg; |
249 | u64 brp64; | |
250 | ||
39549eef WG |
251 | tseg1 = bt->prop_seg + bt->phase_seg1; |
252 | if (!bt->sjw) | |
253 | bt->sjw = 1; | |
254 | if (bt->sjw > btc->sjw_max || | |
255 | tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max || | |
256 | bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max) | |
257 | return -ERANGE; | |
258 | ||
259 | brp64 = (u64)priv->clock.freq * (u64)bt->tq; | |
260 | if (btc->brp_inc > 1) | |
261 | do_div(brp64, btc->brp_inc); | |
262 | brp64 += 500000000UL - 1; | |
263 | do_div(brp64, 1000000000UL); /* the practicable BRP */ | |
264 | if (btc->brp_inc > 1) | |
265 | brp64 *= btc->brp_inc; | |
266 | bt->brp = (u32)brp64; | |
267 | ||
268 | if (bt->brp < btc->brp_min || bt->brp > btc->brp_max) | |
269 | return -EINVAL; | |
270 | ||
271 | alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1; | |
272 | bt->bitrate = priv->clock.freq / (bt->brp * alltseg); | |
273 | bt->sample_point = ((tseg1 + 1) * 1000) / alltseg; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
431af779 | 278 | /* Checks the validity of predefined bitrate settings */ |
d7bda730 MKB |
279 | static int |
280 | can_validate_bitrate(struct net_device *dev, struct can_bittiming *bt, | |
281 | const u32 *bitrate_const, | |
282 | const unsigned int bitrate_const_cnt) | |
431af779 MKB |
283 | { |
284 | struct can_priv *priv = netdev_priv(dev); | |
285 | unsigned int i; | |
286 | ||
287 | for (i = 0; i < bitrate_const_cnt; i++) { | |
288 | if (bt->bitrate == bitrate_const[i]) | |
289 | break; | |
290 | } | |
291 | ||
292 | if (i >= priv->bitrate_const_cnt) | |
293 | return -EINVAL; | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
08da7da4 | 298 | static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt, |
431af779 MKB |
299 | const struct can_bittiming_const *btc, |
300 | const u32 *bitrate_const, | |
301 | const unsigned int bitrate_const_cnt) | |
39549eef | 302 | { |
39549eef WG |
303 | int err; |
304 | ||
ee9a5f5e | 305 | /* Depending on the given can_bittiming parameter structure the CAN |
d5298dff OH |
306 | * timing parameters are calculated based on the provided bitrate OR |
307 | * alternatively the CAN timing parameters (tq, prop_seg, etc.) are | |
308 | * provided directly which are then checked and fixed up. | |
309 | */ | |
431af779 | 310 | if (!bt->tq && bt->bitrate && btc) |
08da7da4 | 311 | err = can_calc_bittiming(dev, bt, btc); |
431af779 | 312 | else if (bt->tq && !bt->bitrate && btc) |
08da7da4 | 313 | err = can_fixup_bittiming(dev, bt, btc); |
431af779 MKB |
314 | else if (!bt->tq && bt->bitrate && bitrate_const) |
315 | err = can_validate_bitrate(dev, bt, bitrate_const, | |
316 | bitrate_const_cnt); | |
d5298dff OH |
317 | else |
318 | err = -EINVAL; | |
39549eef | 319 | |
d5298dff | 320 | return err; |
39549eef WG |
321 | } |
322 | ||
bac78aab AY |
323 | static void can_update_state_error_stats(struct net_device *dev, |
324 | enum can_state new_state) | |
325 | { | |
326 | struct can_priv *priv = netdev_priv(dev); | |
327 | ||
328 | if (new_state <= priv->state) | |
329 | return; | |
330 | ||
331 | switch (new_state) { | |
332 | case CAN_STATE_ERROR_WARNING: | |
333 | priv->can_stats.error_warning++; | |
334 | break; | |
335 | case CAN_STATE_ERROR_PASSIVE: | |
336 | priv->can_stats.error_passive++; | |
337 | break; | |
338 | case CAN_STATE_BUS_OFF: | |
be38a6f9 AY |
339 | priv->can_stats.bus_off++; |
340 | break; | |
bac78aab AY |
341 | default: |
342 | break; | |
5b5ba2af | 343 | } |
bac78aab AY |
344 | } |
345 | ||
346 | static int can_tx_state_to_frame(struct net_device *dev, enum can_state state) | |
347 | { | |
348 | switch (state) { | |
349 | case CAN_STATE_ERROR_ACTIVE: | |
350 | return CAN_ERR_CRTL_ACTIVE; | |
351 | case CAN_STATE_ERROR_WARNING: | |
352 | return CAN_ERR_CRTL_TX_WARNING; | |
353 | case CAN_STATE_ERROR_PASSIVE: | |
354 | return CAN_ERR_CRTL_TX_PASSIVE; | |
355 | default: | |
356 | return 0; | |
357 | } | |
358 | } | |
359 | ||
360 | static int can_rx_state_to_frame(struct net_device *dev, enum can_state state) | |
361 | { | |
362 | switch (state) { | |
363 | case CAN_STATE_ERROR_ACTIVE: | |
364 | return CAN_ERR_CRTL_ACTIVE; | |
365 | case CAN_STATE_ERROR_WARNING: | |
366 | return CAN_ERR_CRTL_RX_WARNING; | |
367 | case CAN_STATE_ERROR_PASSIVE: | |
368 | return CAN_ERR_CRTL_RX_PASSIVE; | |
369 | default: | |
370 | return 0; | |
371 | } | |
372 | } | |
373 | ||
374 | void can_change_state(struct net_device *dev, struct can_frame *cf, | |
375 | enum can_state tx_state, enum can_state rx_state) | |
376 | { | |
377 | struct can_priv *priv = netdev_priv(dev); | |
378 | enum can_state new_state = max(tx_state, rx_state); | |
379 | ||
380 | if (unlikely(new_state == priv->state)) { | |
381 | netdev_warn(dev, "%s: oops, state did not change", __func__); | |
382 | return; | |
383 | } | |
384 | ||
385 | netdev_dbg(dev, "New error state: %d\n", new_state); | |
386 | ||
387 | can_update_state_error_stats(dev, new_state); | |
388 | priv->state = new_state; | |
389 | ||
ff3416fb MKB |
390 | if (!cf) |
391 | return; | |
392 | ||
bac78aab AY |
393 | if (unlikely(new_state == CAN_STATE_BUS_OFF)) { |
394 | cf->can_id |= CAN_ERR_BUSOFF; | |
395 | return; | |
396 | } | |
397 | ||
398 | cf->can_id |= CAN_ERR_CRTL; | |
399 | cf->data[1] |= tx_state >= rx_state ? | |
400 | can_tx_state_to_frame(dev, tx_state) : 0; | |
401 | cf->data[1] |= tx_state <= rx_state ? | |
402 | can_rx_state_to_frame(dev, rx_state) : 0; | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(can_change_state); | |
405 | ||
ee9a5f5e | 406 | /* Local echo of CAN messages |
39549eef WG |
407 | * |
408 | * CAN network devices *should* support a local echo functionality | |
7d597739 | 409 | * (see Documentation/networking/can.rst). To test the handling of CAN |
39549eef WG |
410 | * interfaces that do not support the local echo both driver types are |
411 | * implemented. In the case that the driver does not support the echo | |
412 | * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core | |
413 | * to perform the echo as a fallback solution. | |
414 | */ | |
415 | static void can_flush_echo_skb(struct net_device *dev) | |
416 | { | |
417 | struct can_priv *priv = netdev_priv(dev); | |
418 | struct net_device_stats *stats = &dev->stats; | |
419 | int i; | |
420 | ||
a6e4bc53 | 421 | for (i = 0; i < priv->echo_skb_max; i++) { |
39549eef WG |
422 | if (priv->echo_skb[i]) { |
423 | kfree_skb(priv->echo_skb[i]); | |
424 | priv->echo_skb[i] = NULL; | |
425 | stats->tx_dropped++; | |
426 | stats->tx_aborted_errors++; | |
427 | } | |
428 | } | |
429 | } | |
430 | ||
ee9a5f5e | 431 | /* Put the skb on the stack to be looped backed locally lateron |
39549eef WG |
432 | * |
433 | * The function is typically called in the start_xmit function | |
434 | * of the device driver. The driver must protect access to | |
435 | * priv->echo_skb, if necessary. | |
436 | */ | |
a6e4bc53 WG |
437 | void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, |
438 | unsigned int idx) | |
39549eef WG |
439 | { |
440 | struct can_priv *priv = netdev_priv(dev); | |
441 | ||
a6e4bc53 WG |
442 | BUG_ON(idx >= priv->echo_skb_max); |
443 | ||
39549eef | 444 | /* check flag whether this packet has to be looped back */ |
a94bc9c4 OH |
445 | if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK || |
446 | (skb->protocol != htons(ETH_P_CAN) && | |
447 | skb->protocol != htons(ETH_P_CANFD))) { | |
39549eef WG |
448 | kfree_skb(skb); |
449 | return; | |
450 | } | |
451 | ||
452 | if (!priv->echo_skb[idx]) { | |
0ae89beb OH |
453 | skb = can_create_echo_skb(skb); |
454 | if (!skb) | |
455 | return; | |
39549eef WG |
456 | |
457 | /* make settings for echo to reduce code in irq context */ | |
39549eef WG |
458 | skb->pkt_type = PACKET_BROADCAST; |
459 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
460 | skb->dev = dev; | |
461 | ||
462 | /* save this skb for tx interrupt echo handling */ | |
463 | priv->echo_skb[idx] = skb; | |
464 | } else { | |
465 | /* locking problem with netif_stop_queue() ?? */ | |
aabdfd6a | 466 | netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__); |
39549eef WG |
467 | kfree_skb(skb); |
468 | } | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(can_put_echo_skb); | |
471 | ||
d7bda730 MKB |
472 | struct sk_buff * |
473 | __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr) | |
39549eef WG |
474 | { |
475 | struct can_priv *priv = netdev_priv(dev); | |
476 | ||
e7a6994d MKB |
477 | if (idx >= priv->echo_skb_max) { |
478 | netdev_err(dev, "%s: BUG! Trying to access can_priv::echo_skb out of bounds (%u/max %u)\n", | |
479 | __func__, idx, priv->echo_skb_max); | |
480 | return NULL; | |
481 | } | |
a6e4bc53 | 482 | |
7b12c818 MS |
483 | if (priv->echo_skb[idx]) { |
484 | /* Using "struct canfd_frame::len" for the frame | |
485 | * length is supported on both CAN and CANFD frames. | |
486 | */ | |
487 | struct sk_buff *skb = priv->echo_skb[idx]; | |
488 | struct canfd_frame *cf = (struct canfd_frame *)skb->data; | |
489 | u8 len = cf->len; | |
cf5046b3 | 490 | |
7b12c818 MS |
491 | *len_ptr = len; |
492 | priv->echo_skb[idx] = NULL; | |
493 | ||
494 | return skb; | |
495 | } | |
7da11ba5 | 496 | |
7b12c818 | 497 | return NULL; |
a4310fa2 MKB |
498 | } |
499 | ||
ee9a5f5e | 500 | /* Get the skb from the stack and loop it back locally |
a4310fa2 MKB |
501 | * |
502 | * The function is typically called when the TX done interrupt | |
503 | * is handled in the device driver. The driver must protect | |
504 | * access to priv->echo_skb, if necessary. | |
505 | */ | |
506 | unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) | |
507 | { | |
508 | struct sk_buff *skb; | |
509 | u8 len; | |
510 | ||
511 | skb = __can_get_echo_skb(dev, idx, &len); | |
512 | if (!skb) | |
513 | return 0; | |
514 | ||
515 | netif_rx(skb); | |
516 | ||
517 | return len; | |
39549eef WG |
518 | } |
519 | EXPORT_SYMBOL_GPL(can_get_echo_skb); | |
520 | ||
ee9a5f5e MKB |
521 | /* Remove the skb from the stack and free it. |
522 | * | |
523 | * The function is typically called when TX failed. | |
524 | */ | |
a6e4bc53 | 525 | void can_free_echo_skb(struct net_device *dev, unsigned int idx) |
39e3ab6f WG |
526 | { |
527 | struct can_priv *priv = netdev_priv(dev); | |
528 | ||
a6e4bc53 WG |
529 | BUG_ON(idx >= priv->echo_skb_max); |
530 | ||
39e3ab6f | 531 | if (priv->echo_skb[idx]) { |
5247a589 | 532 | dev_kfree_skb_any(priv->echo_skb[idx]); |
39e3ab6f WG |
533 | priv->echo_skb[idx] = NULL; |
534 | } | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(can_free_echo_skb); | |
537 | ||
ee9a5f5e | 538 | /* CAN device restart for bus-off recovery */ |
9abefcb1 | 539 | static void can_restart(struct net_device *dev) |
39549eef | 540 | { |
39549eef WG |
541 | struct can_priv *priv = netdev_priv(dev); |
542 | struct net_device_stats *stats = &dev->stats; | |
543 | struct sk_buff *skb; | |
544 | struct can_frame *cf; | |
545 | int err; | |
546 | ||
547 | BUG_ON(netif_carrier_ok(dev)); | |
548 | ||
ee9a5f5e | 549 | /* No synchronization needed because the device is bus-off and |
39549eef WG |
550 | * no messages can come in or go out. |
551 | */ | |
552 | can_flush_echo_skb(dev); | |
553 | ||
554 | /* send restart message upstream */ | |
7b6856a0 | 555 | skb = alloc_can_err_skb(dev, &cf); |
371fd7ba | 556 | if (!skb) |
b3d0df7c | 557 | goto restart; |
371fd7ba | 558 | |
7b6856a0 | 559 | cf->can_id |= CAN_ERR_RESTARTED; |
39549eef WG |
560 | |
561 | netif_rx(skb); | |
562 | ||
39549eef WG |
563 | stats->rx_packets++; |
564 | stats->rx_bytes += cf->can_dlc; | |
565 | ||
b3d0df7c | 566 | restart: |
aabdfd6a | 567 | netdev_dbg(dev, "restarted\n"); |
39549eef WG |
568 | priv->can_stats.restarts++; |
569 | ||
570 | /* Now restart the device */ | |
571 | err = priv->do_set_mode(dev, CAN_MODE_START); | |
572 | ||
39549eef WG |
573 | netif_carrier_on(dev); |
574 | if (err) | |
aabdfd6a | 575 | netdev_err(dev, "Error %d during restart", err); |
39549eef WG |
576 | } |
577 | ||
9abefcb1 SM |
578 | static void can_restart_work(struct work_struct *work) |
579 | { | |
580 | struct delayed_work *dwork = to_delayed_work(work); | |
d7bda730 MKB |
581 | struct can_priv *priv = container_of(dwork, struct can_priv, |
582 | restart_work); | |
9abefcb1 SM |
583 | |
584 | can_restart(priv->dev); | |
585 | } | |
586 | ||
39549eef WG |
587 | int can_restart_now(struct net_device *dev) |
588 | { | |
589 | struct can_priv *priv = netdev_priv(dev); | |
590 | ||
ee9a5f5e | 591 | /* A manual restart is only permitted if automatic restart is |
39549eef WG |
592 | * disabled and the device is in the bus-off state |
593 | */ | |
594 | if (priv->restart_ms) | |
595 | return -EINVAL; | |
596 | if (priv->state != CAN_STATE_BUS_OFF) | |
597 | return -EBUSY; | |
598 | ||
9abefcb1 SM |
599 | cancel_delayed_work_sync(&priv->restart_work); |
600 | can_restart(dev); | |
39549eef WG |
601 | |
602 | return 0; | |
603 | } | |
604 | ||
ee9a5f5e | 605 | /* CAN bus-off |
39549eef WG |
606 | * |
607 | * This functions should be called when the device goes bus-off to | |
608 | * tell the netif layer that no more packets can be sent or received. | |
609 | * If enabled, a timer is started to trigger bus-off recovery. | |
610 | */ | |
611 | void can_bus_off(struct net_device *dev) | |
612 | { | |
613 | struct can_priv *priv = netdev_priv(dev); | |
614 | ||
71c23a82 | 615 | netdev_info(dev, "bus-off\n"); |
39549eef WG |
616 | |
617 | netif_carrier_off(dev); | |
39549eef WG |
618 | |
619 | if (priv->restart_ms) | |
9abefcb1 SM |
620 | schedule_delayed_work(&priv->restart_work, |
621 | msecs_to_jiffies(priv->restart_ms)); | |
39549eef WG |
622 | } |
623 | EXPORT_SYMBOL_GPL(can_bus_off); | |
624 | ||
625 | static void can_setup(struct net_device *dev) | |
626 | { | |
627 | dev->type = ARPHRD_CAN; | |
1e0625fa | 628 | dev->mtu = CAN_MTU; |
39549eef WG |
629 | dev->hard_header_len = 0; |
630 | dev->addr_len = 0; | |
631 | dev->tx_queue_len = 10; | |
632 | ||
633 | /* New-style flags. */ | |
634 | dev->flags = IFF_NOARP; | |
34324dc2 | 635 | dev->features = NETIF_F_HW_CSUM; |
39549eef WG |
636 | } |
637 | ||
7b6856a0 WG |
638 | struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) |
639 | { | |
640 | struct sk_buff *skb; | |
641 | ||
156c2bb9 OH |
642 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + |
643 | sizeof(struct can_frame)); | |
7b6856a0 WG |
644 | if (unlikely(!skb)) |
645 | return NULL; | |
646 | ||
647 | skb->protocol = htons(ETH_P_CAN); | |
648 | skb->pkt_type = PACKET_BROADCAST; | |
649 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
156c2bb9 | 650 | |
96943901 OH |
651 | skb_reset_mac_header(skb); |
652 | skb_reset_network_header(skb); | |
653 | skb_reset_transport_header(skb); | |
654 | ||
2bf3440d OH |
655 | can_skb_reserve(skb); |
656 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 657 | can_skb_prv(skb)->skbcnt = 0; |
156c2bb9 | 658 | |
8551e71d | 659 | *cf = skb_put_zero(skb, sizeof(struct can_frame)); |
7b6856a0 WG |
660 | |
661 | return skb; | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(alloc_can_skb); | |
664 | ||
cb2518ca SG |
665 | struct sk_buff *alloc_canfd_skb(struct net_device *dev, |
666 | struct canfd_frame **cfd) | |
667 | { | |
668 | struct sk_buff *skb; | |
669 | ||
670 | skb = netdev_alloc_skb(dev, sizeof(struct can_skb_priv) + | |
671 | sizeof(struct canfd_frame)); | |
672 | if (unlikely(!skb)) | |
673 | return NULL; | |
674 | ||
675 | skb->protocol = htons(ETH_P_CANFD); | |
676 | skb->pkt_type = PACKET_BROADCAST; | |
677 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
678 | ||
96943901 OH |
679 | skb_reset_mac_header(skb); |
680 | skb_reset_network_header(skb); | |
681 | skb_reset_transport_header(skb); | |
682 | ||
cb2518ca SG |
683 | can_skb_reserve(skb); |
684 | can_skb_prv(skb)->ifindex = dev->ifindex; | |
d3b58c47 | 685 | can_skb_prv(skb)->skbcnt = 0; |
cb2518ca | 686 | |
8551e71d | 687 | *cfd = skb_put_zero(skb, sizeof(struct canfd_frame)); |
cb2518ca SG |
688 | |
689 | return skb; | |
690 | } | |
691 | EXPORT_SYMBOL_GPL(alloc_canfd_skb); | |
692 | ||
7b6856a0 WG |
693 | struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) |
694 | { | |
695 | struct sk_buff *skb; | |
696 | ||
697 | skb = alloc_can_skb(dev, cf); | |
698 | if (unlikely(!skb)) | |
699 | return NULL; | |
700 | ||
701 | (*cf)->can_id = CAN_ERR_FLAG; | |
702 | (*cf)->can_dlc = CAN_ERR_DLC; | |
703 | ||
704 | return skb; | |
705 | } | |
706 | EXPORT_SYMBOL_GPL(alloc_can_err_skb); | |
707 | ||
ee9a5f5e | 708 | /* Allocate and setup space for the CAN network device */ |
03870907 ZY |
709 | struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max, |
710 | unsigned int txqs, unsigned int rxqs) | |
39549eef WG |
711 | { |
712 | struct net_device *dev; | |
713 | struct can_priv *priv; | |
a6e4bc53 | 714 | int size; |
39549eef | 715 | |
ffd956ee MKB |
716 | /* We put the driver's priv, the CAN mid layer priv and the |
717 | * echo skb into the netdevice's priv. The memory layout for | |
718 | * the netdev_priv is like this: | |
719 | * | |
720 | * +-------------------------+ | |
721 | * | driver's priv | | |
722 | * +-------------------------+ | |
723 | * | struct can_ml_priv | | |
724 | * +-------------------------+ | |
725 | * | array of struct sk_buff | | |
726 | * +-------------------------+ | |
727 | */ | |
728 | ||
729 | size = ALIGN(sizeof_priv, NETDEV_ALIGN) + sizeof(struct can_ml_priv); | |
730 | ||
a6e4bc53 | 731 | if (echo_skb_max) |
ffd956ee | 732 | size = ALIGN(size, sizeof(struct sk_buff *)) + |
a6e4bc53 | 733 | echo_skb_max * sizeof(struct sk_buff *); |
a6e4bc53 | 734 | |
03870907 ZY |
735 | dev = alloc_netdev_mqs(size, "can%d", NET_NAME_UNKNOWN, can_setup, |
736 | txqs, rxqs); | |
39549eef WG |
737 | if (!dev) |
738 | return NULL; | |
739 | ||
740 | priv = netdev_priv(dev); | |
9abefcb1 | 741 | priv->dev = dev; |
39549eef | 742 | |
8df9ffb8 MKB |
743 | dev->ml_priv = (void *)priv + ALIGN(sizeof_priv, NETDEV_ALIGN); |
744 | ||
a6e4bc53 WG |
745 | if (echo_skb_max) { |
746 | priv->echo_skb_max = echo_skb_max; | |
747 | priv->echo_skb = (void *)priv + | |
ffd956ee | 748 | (size - echo_skb_max * sizeof(struct sk_buff *)); |
a6e4bc53 WG |
749 | } |
750 | ||
39549eef WG |
751 | priv->state = CAN_STATE_STOPPED; |
752 | ||
9abefcb1 | 753 | INIT_DELAYED_WORK(&priv->restart_work, can_restart_work); |
39549eef WG |
754 | |
755 | return dev; | |
756 | } | |
03870907 | 757 | EXPORT_SYMBOL_GPL(alloc_candev_mqs); |
39549eef | 758 | |
ee9a5f5e | 759 | /* Free space of the CAN network device */ |
39549eef WG |
760 | void free_candev(struct net_device *dev) |
761 | { | |
762 | free_netdev(dev); | |
763 | } | |
764 | EXPORT_SYMBOL_GPL(free_candev); | |
765 | ||
ee9a5f5e | 766 | /* changing MTU and control mode for CAN/CANFD devices */ |
bc05a894 OH |
767 | int can_change_mtu(struct net_device *dev, int new_mtu) |
768 | { | |
769 | struct can_priv *priv = netdev_priv(dev); | |
770 | ||
771 | /* Do not allow changing the MTU while running */ | |
772 | if (dev->flags & IFF_UP) | |
773 | return -EBUSY; | |
774 | ||
775 | /* allow change of MTU according to the CANFD ability of the device */ | |
776 | switch (new_mtu) { | |
777 | case CAN_MTU: | |
bb208f14 OH |
778 | /* 'CANFD-only' controllers can not switch to CAN_MTU */ |
779 | if (priv->ctrlmode_static & CAN_CTRLMODE_FD) | |
780 | return -EINVAL; | |
781 | ||
bc05a894 OH |
782 | priv->ctrlmode &= ~CAN_CTRLMODE_FD; |
783 | break; | |
784 | ||
785 | case CANFD_MTU: | |
bb208f14 OH |
786 | /* check for potential CANFD ability */ |
787 | if (!(priv->ctrlmode_supported & CAN_CTRLMODE_FD) && | |
788 | !(priv->ctrlmode_static & CAN_CTRLMODE_FD)) | |
bc05a894 OH |
789 | return -EINVAL; |
790 | ||
791 | priv->ctrlmode |= CAN_CTRLMODE_FD; | |
792 | break; | |
793 | ||
794 | default: | |
795 | return -EINVAL; | |
796 | } | |
797 | ||
798 | dev->mtu = new_mtu; | |
799 | return 0; | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(can_change_mtu); | |
802 | ||
ee9a5f5e | 803 | /* Common open function when the device gets opened. |
39549eef WG |
804 | * |
805 | * This function should be called in the open function of the device | |
806 | * driver. | |
807 | */ | |
808 | int open_candev(struct net_device *dev) | |
809 | { | |
810 | struct can_priv *priv = netdev_priv(dev); | |
811 | ||
b30749fd | 812 | if (!priv->bittiming.bitrate) { |
aabdfd6a | 813 | netdev_err(dev, "bit-timing not yet defined\n"); |
39549eef WG |
814 | return -EINVAL; |
815 | } | |
816 | ||
dd22586d OH |
817 | /* For CAN FD the data bitrate has to be >= the arbitration bitrate */ |
818 | if ((priv->ctrlmode & CAN_CTRLMODE_FD) && | |
819 | (!priv->data_bittiming.bitrate || | |
39fe6fd5 | 820 | priv->data_bittiming.bitrate < priv->bittiming.bitrate)) { |
dd22586d OH |
821 | netdev_err(dev, "incorrect/missing data bit-timing\n"); |
822 | return -EINVAL; | |
823 | } | |
824 | ||
1b0d9224 WG |
825 | /* Switch carrier on if device was stopped while in bus-off state */ |
826 | if (!netif_carrier_ok(dev)) | |
827 | netif_carrier_on(dev); | |
828 | ||
39549eef WG |
829 | return 0; |
830 | } | |
128ced8f | 831 | EXPORT_SYMBOL_GPL(open_candev); |
39549eef | 832 | |
2290aefa FCJ |
833 | #ifdef CONFIG_OF |
834 | /* Common function that can be used to understand the limitation of | |
835 | * a transceiver when it provides no means to determine these limitations | |
836 | * at runtime. | |
837 | */ | |
838 | void of_can_transceiver(struct net_device *dev) | |
839 | { | |
840 | struct device_node *dn; | |
841 | struct can_priv *priv = netdev_priv(dev); | |
842 | struct device_node *np = dev->dev.parent->of_node; | |
843 | int ret; | |
844 | ||
845 | dn = of_get_child_by_name(np, "can-transceiver"); | |
846 | if (!dn) | |
847 | return; | |
848 | ||
849 | ret = of_property_read_u32(dn, "max-bitrate", &priv->bitrate_max); | |
db9ee384 | 850 | of_node_put(dn); |
2290aefa FCJ |
851 | if ((ret && ret != -EINVAL) || (!ret && !priv->bitrate_max)) |
852 | netdev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit.\n"); | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(of_can_transceiver); | |
855 | #endif | |
856 | ||
ee9a5f5e | 857 | /* Common close function for cleanup before the device gets closed. |
39549eef WG |
858 | * |
859 | * This function should be called in the close function of the device | |
860 | * driver. | |
861 | */ | |
862 | void close_candev(struct net_device *dev) | |
863 | { | |
864 | struct can_priv *priv = netdev_priv(dev); | |
865 | ||
9abefcb1 | 866 | cancel_delayed_work_sync(&priv->restart_work); |
39549eef WG |
867 | can_flush_echo_skb(dev); |
868 | } | |
869 | EXPORT_SYMBOL_GPL(close_candev); | |
870 | ||
ee9a5f5e | 871 | /* CAN netlink interface */ |
39549eef WG |
872 | static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { |
873 | [IFLA_CAN_STATE] = { .type = NLA_U32 }, | |
874 | [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) }, | |
875 | [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 }, | |
876 | [IFLA_CAN_RESTART] = { .type = NLA_U32 }, | |
877 | [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) }, | |
878 | [IFLA_CAN_BITTIMING_CONST] | |
879 | = { .len = sizeof(struct can_bittiming_const) }, | |
880 | [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) }, | |
52c793f2 | 881 | [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) }, |
9859ccd2 OH |
882 | [IFLA_CAN_DATA_BITTIMING] |
883 | = { .len = sizeof(struct can_bittiming) }, | |
884 | [IFLA_CAN_DATA_BITTIMING_CONST] | |
885 | = { .len = sizeof(struct can_bittiming_const) }, | |
ab02ad66 | 886 | [IFLA_CAN_TERMINATION] = { .type = NLA_U16 }, |
39549eef WG |
887 | }; |
888 | ||
a8b8a889 MS |
889 | static int can_validate(struct nlattr *tb[], struct nlattr *data[], |
890 | struct netlink_ext_ack *extack) | |
bb208f14 OH |
891 | { |
892 | bool is_can_fd = false; | |
893 | ||
894 | /* Make sure that valid CAN FD configurations always consist of | |
895 | * - nominal/arbitration bittiming | |
896 | * - data bittiming | |
897 | * - control mode with CAN_CTRLMODE_FD set | |
898 | */ | |
899 | ||
bce271f2 OH |
900 | if (!data) |
901 | return 0; | |
902 | ||
bb208f14 OH |
903 | if (data[IFLA_CAN_CTRLMODE]) { |
904 | struct can_ctrlmode *cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
905 | ||
906 | is_can_fd = cm->flags & cm->mask & CAN_CTRLMODE_FD; | |
907 | } | |
908 | ||
909 | if (is_can_fd) { | |
910 | if (!data[IFLA_CAN_BITTIMING] || !data[IFLA_CAN_DATA_BITTIMING]) | |
911 | return -EOPNOTSUPP; | |
912 | } | |
913 | ||
914 | if (data[IFLA_CAN_DATA_BITTIMING]) { | |
915 | if (!is_can_fd || !data[IFLA_CAN_BITTIMING]) | |
916 | return -EOPNOTSUPP; | |
917 | } | |
918 | ||
919 | return 0; | |
920 | } | |
921 | ||
ad744b22 MS |
922 | static int can_changelink(struct net_device *dev, struct nlattr *tb[], |
923 | struct nlattr *data[], | |
924 | struct netlink_ext_ack *extack) | |
39549eef WG |
925 | { |
926 | struct can_priv *priv = netdev_priv(dev); | |
927 | int err; | |
928 | ||
929 | /* We need synchronization with dev->stop() */ | |
930 | ASSERT_RTNL(); | |
931 | ||
39549eef WG |
932 | if (data[IFLA_CAN_BITTIMING]) { |
933 | struct can_bittiming bt; | |
934 | ||
935 | /* Do not allow changing bittiming while running */ | |
936 | if (dev->flags & IFF_UP) | |
937 | return -EBUSY; | |
c3606d43 MKB |
938 | |
939 | /* Calculate bittiming parameters based on | |
940 | * bittiming_const if set, otherwise pass bitrate | |
941 | * directly via do_set_bitrate(). Bail out if neither | |
942 | * is given. | |
943 | */ | |
944 | if (!priv->bittiming_const && !priv->do_set_bittiming) | |
945 | return -EOPNOTSUPP; | |
946 | ||
39549eef | 947 | memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); |
431af779 MKB |
948 | err = can_get_bittiming(dev, &bt, |
949 | priv->bittiming_const, | |
950 | priv->bitrate_const, | |
951 | priv->bitrate_const_cnt); | |
952 | if (err) | |
953 | return err; | |
2290aefa FCJ |
954 | |
955 | if (priv->bitrate_max && bt.bitrate > priv->bitrate_max) { | |
956 | netdev_err(dev, "arbitration bitrate surpasses transceiver capabilities of %d bps\n", | |
957 | priv->bitrate_max); | |
958 | return -EINVAL; | |
959 | } | |
960 | ||
39549eef WG |
961 | memcpy(&priv->bittiming, &bt, sizeof(bt)); |
962 | ||
963 | if (priv->do_set_bittiming) { | |
964 | /* Finally, set the bit-timing registers */ | |
965 | err = priv->do_set_bittiming(dev); | |
966 | if (err) | |
967 | return err; | |
968 | } | |
969 | } | |
970 | ||
49cb5c0e MKB |
971 | if (data[IFLA_CAN_CTRLMODE]) { |
972 | struct can_ctrlmode *cm; | |
bb208f14 OH |
973 | u32 ctrlstatic; |
974 | u32 maskedflags; | |
49cb5c0e MKB |
975 | |
976 | /* Do not allow changing controller mode while running */ | |
977 | if (dev->flags & IFF_UP) | |
978 | return -EBUSY; | |
979 | cm = nla_data(data[IFLA_CAN_CTRLMODE]); | |
bb208f14 OH |
980 | ctrlstatic = priv->ctrlmode_static; |
981 | maskedflags = cm->flags & cm->mask; | |
982 | ||
983 | /* check whether provided bits are allowed to be passed */ | |
984 | if (cm->mask & ~(priv->ctrlmode_supported | ctrlstatic)) | |
985 | return -EOPNOTSUPP; | |
986 | ||
987 | /* do not check for static fd-non-iso if 'fd' is disabled */ | |
988 | if (!(maskedflags & CAN_CTRLMODE_FD)) | |
989 | ctrlstatic &= ~CAN_CTRLMODE_FD_NON_ISO; | |
9b1087aa | 990 | |
bb208f14 OH |
991 | /* make sure static options are provided by configuration */ |
992 | if ((maskedflags & ctrlstatic) != ctrlstatic) | |
49cb5c0e | 993 | return -EOPNOTSUPP; |
9b1087aa OH |
994 | |
995 | /* clear bits to be modified and copy the flag values */ | |
49cb5c0e | 996 | priv->ctrlmode &= ~cm->mask; |
bb208f14 | 997 | priv->ctrlmode |= maskedflags; |
bc05a894 OH |
998 | |
999 | /* CAN_CTRLMODE_FD can only be set when driver supports FD */ | |
1000 | if (priv->ctrlmode & CAN_CTRLMODE_FD) | |
1001 | dev->mtu = CANFD_MTU; | |
1002 | else | |
1003 | dev->mtu = CAN_MTU; | |
49cb5c0e MKB |
1004 | } |
1005 | ||
39549eef WG |
1006 | if (data[IFLA_CAN_RESTART_MS]) { |
1007 | /* Do not allow changing restart delay while running */ | |
1008 | if (dev->flags & IFF_UP) | |
1009 | return -EBUSY; | |
1010 | priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); | |
1011 | } | |
1012 | ||
1013 | if (data[IFLA_CAN_RESTART]) { | |
1014 | /* Do not allow a restart while not running */ | |
1015 | if (!(dev->flags & IFF_UP)) | |
1016 | return -EINVAL; | |
1017 | err = can_restart_now(dev); | |
1018 | if (err) | |
1019 | return err; | |
1020 | } | |
1021 | ||
9859ccd2 OH |
1022 | if (data[IFLA_CAN_DATA_BITTIMING]) { |
1023 | struct can_bittiming dbt; | |
1024 | ||
1025 | /* Do not allow changing bittiming while running */ | |
1026 | if (dev->flags & IFF_UP) | |
1027 | return -EBUSY; | |
c3606d43 MKB |
1028 | |
1029 | /* Calculate bittiming parameters based on | |
1030 | * data_bittiming_const if set, otherwise pass bitrate | |
1031 | * directly via do_set_bitrate(). Bail out if neither | |
1032 | * is given. | |
1033 | */ | |
1034 | if (!priv->data_bittiming_const && !priv->do_set_data_bittiming) | |
1035 | return -EOPNOTSUPP; | |
1036 | ||
9859ccd2 OH |
1037 | memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]), |
1038 | sizeof(dbt)); | |
431af779 MKB |
1039 | err = can_get_bittiming(dev, &dbt, |
1040 | priv->data_bittiming_const, | |
1041 | priv->data_bitrate_const, | |
1042 | priv->data_bitrate_const_cnt); | |
1043 | if (err) | |
1044 | return err; | |
2290aefa FCJ |
1045 | |
1046 | if (priv->bitrate_max && dbt.bitrate > priv->bitrate_max) { | |
1047 | netdev_err(dev, "canfd data bitrate surpasses transceiver capabilities of %d bps\n", | |
1048 | priv->bitrate_max); | |
1049 | return -EINVAL; | |
1050 | } | |
1051 | ||
9859ccd2 OH |
1052 | memcpy(&priv->data_bittiming, &dbt, sizeof(dbt)); |
1053 | ||
1054 | if (priv->do_set_data_bittiming) { | |
1055 | /* Finally, set the bit-timing registers */ | |
1056 | err = priv->do_set_data_bittiming(dev); | |
1057 | if (err) | |
1058 | return err; | |
1059 | } | |
1060 | } | |
1061 | ||
12a6075c OH |
1062 | if (data[IFLA_CAN_TERMINATION]) { |
1063 | const u16 termval = nla_get_u16(data[IFLA_CAN_TERMINATION]); | |
1064 | const unsigned int num_term = priv->termination_const_cnt; | |
1065 | unsigned int i; | |
1066 | ||
1067 | if (!priv->do_set_termination) | |
1068 | return -EOPNOTSUPP; | |
1069 | ||
1070 | /* check whether given value is supported by the interface */ | |
1071 | for (i = 0; i < num_term; i++) { | |
1072 | if (termval == priv->termination_const[i]) | |
1073 | break; | |
1074 | } | |
1075 | if (i >= num_term) | |
1076 | return -EINVAL; | |
1077 | ||
1078 | /* Finally, set the termination value */ | |
1079 | err = priv->do_set_termination(dev, termval); | |
1080 | if (err) | |
1081 | return err; | |
1082 | ||
1083 | priv->termination = termval; | |
1084 | } | |
1085 | ||
39549eef WG |
1086 | return 0; |
1087 | } | |
1088 | ||
53a0ef86 WG |
1089 | static size_t can_get_size(const struct net_device *dev) |
1090 | { | |
1091 | struct can_priv *priv = netdev_priv(dev); | |
c13c64d8 MKB |
1092 | size_t size = 0; |
1093 | ||
b30749fd OH |
1094 | if (priv->bittiming.bitrate) /* IFLA_CAN_BITTIMING */ |
1095 | size += nla_total_size(sizeof(struct can_bittiming)); | |
c13c64d8 | 1096 | if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ |
fe119a05 | 1097 | size += nla_total_size(sizeof(struct can_bittiming_const)); |
c13c64d8 MKB |
1098 | size += nla_total_size(sizeof(struct can_clock)); /* IFLA_CAN_CLOCK */ |
1099 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ | |
1100 | size += nla_total_size(sizeof(struct can_ctrlmode)); /* IFLA_CAN_CTRLMODE */ | |
1101 | size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ | |
1102 | if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ | |
1103 | size += nla_total_size(sizeof(struct can_berr_counter)); | |
9859ccd2 OH |
1104 | if (priv->data_bittiming.bitrate) /* IFLA_CAN_DATA_BITTIMING */ |
1105 | size += nla_total_size(sizeof(struct can_bittiming)); | |
1106 | if (priv->data_bittiming_const) /* IFLA_CAN_DATA_BITTIMING_CONST */ | |
1107 | size += nla_total_size(sizeof(struct can_bittiming_const)); | |
12a6075c OH |
1108 | if (priv->termination_const) { |
1109 | size += nla_total_size(sizeof(priv->termination)); /* IFLA_CAN_TERMINATION */ | |
1110 | size += nla_total_size(sizeof(*priv->termination_const) * /* IFLA_CAN_TERMINATION_CONST */ | |
1111 | priv->termination_const_cnt); | |
1112 | } | |
431af779 MKB |
1113 | if (priv->bitrate_const) /* IFLA_CAN_BITRATE_CONST */ |
1114 | size += nla_total_size(sizeof(*priv->bitrate_const) * | |
1115 | priv->bitrate_const_cnt); | |
1116 | if (priv->data_bitrate_const) /* IFLA_CAN_DATA_BITRATE_CONST */ | |
1117 | size += nla_total_size(sizeof(*priv->data_bitrate_const) * | |
1118 | priv->data_bitrate_const_cnt); | |
2290aefa | 1119 | size += sizeof(priv->bitrate_max); /* IFLA_CAN_BITRATE_MAX */ |
53a0ef86 WG |
1120 | |
1121 | return size; | |
1122 | } | |
1123 | ||
39549eef WG |
1124 | static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) |
1125 | { | |
1126 | struct can_priv *priv = netdev_priv(dev); | |
1127 | struct can_ctrlmode cm = {.flags = priv->ctrlmode}; | |
52c793f2 | 1128 | struct can_berr_counter bec; |
39549eef WG |
1129 | enum can_state state = priv->state; |
1130 | ||
1131 | if (priv->do_get_state) | |
1132 | priv->do_get_state(dev, &state); | |
9859ccd2 | 1133 | |
b30749fd OH |
1134 | if ((priv->bittiming.bitrate && |
1135 | nla_put(skb, IFLA_CAN_BITTIMING, | |
1136 | sizeof(priv->bittiming), &priv->bittiming)) || | |
9859ccd2 | 1137 | |
57a59b9e MKB |
1138 | (priv->bittiming_const && |
1139 | nla_put(skb, IFLA_CAN_BITTIMING_CONST, | |
1140 | sizeof(*priv->bittiming_const), priv->bittiming_const)) || | |
9859ccd2 | 1141 | |
562b103a | 1142 | nla_put(skb, IFLA_CAN_CLOCK, sizeof(priv->clock), &priv->clock) || |
57a59b9e MKB |
1143 | nla_put_u32(skb, IFLA_CAN_STATE, state) || |
1144 | nla_put(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm) || | |
1145 | nla_put_u32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms) || | |
9859ccd2 | 1146 | |
31e0e328 DM |
1147 | (priv->do_get_berr_counter && |
1148 | !priv->do_get_berr_counter(dev, &bec) && | |
9859ccd2 OH |
1149 | nla_put(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec)) || |
1150 | ||
1151 | (priv->data_bittiming.bitrate && | |
1152 | nla_put(skb, IFLA_CAN_DATA_BITTIMING, | |
1153 | sizeof(priv->data_bittiming), &priv->data_bittiming)) || | |
1154 | ||
1155 | (priv->data_bittiming_const && | |
1156 | nla_put(skb, IFLA_CAN_DATA_BITTIMING_CONST, | |
1157 | sizeof(*priv->data_bittiming_const), | |
12a6075c OH |
1158 | priv->data_bittiming_const)) || |
1159 | ||
1160 | (priv->termination_const && | |
1161 | (nla_put_u16(skb, IFLA_CAN_TERMINATION, priv->termination) || | |
1162 | nla_put(skb, IFLA_CAN_TERMINATION_CONST, | |
1163 | sizeof(*priv->termination_const) * | |
1164 | priv->termination_const_cnt, | |
431af779 MKB |
1165 | priv->termination_const))) || |
1166 | ||
1167 | (priv->bitrate_const && | |
1168 | nla_put(skb, IFLA_CAN_BITRATE_CONST, | |
1169 | sizeof(*priv->bitrate_const) * | |
1170 | priv->bitrate_const_cnt, | |
1171 | priv->bitrate_const)) || | |
1172 | ||
1173 | (priv->data_bitrate_const && | |
1174 | nla_put(skb, IFLA_CAN_DATA_BITRATE_CONST, | |
1175 | sizeof(*priv->data_bitrate_const) * | |
1176 | priv->data_bitrate_const_cnt, | |
2290aefa FCJ |
1177 | priv->data_bitrate_const)) || |
1178 | ||
1179 | (nla_put(skb, IFLA_CAN_BITRATE_MAX, | |
1180 | sizeof(priv->bitrate_max), | |
1181 | &priv->bitrate_max)) | |
431af779 | 1182 | ) |
12a6075c | 1183 | |
57a59b9e | 1184 | return -EMSGSIZE; |
9859ccd2 | 1185 | |
39549eef | 1186 | return 0; |
39549eef WG |
1187 | } |
1188 | ||
55369c0a WG |
1189 | static size_t can_get_xstats_size(const struct net_device *dev) |
1190 | { | |
1191 | return sizeof(struct can_device_stats); | |
1192 | } | |
1193 | ||
39549eef WG |
1194 | static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) |
1195 | { | |
1196 | struct can_priv *priv = netdev_priv(dev); | |
1197 | ||
31e0e328 DM |
1198 | if (nla_put(skb, IFLA_INFO_XSTATS, |
1199 | sizeof(priv->can_stats), &priv->can_stats)) | |
1200 | goto nla_put_failure; | |
39549eef WG |
1201 | return 0; |
1202 | ||
1203 | nla_put_failure: | |
1204 | return -EMSGSIZE; | |
1205 | } | |
1206 | ||
81adee47 | 1207 | static int can_newlink(struct net *src_net, struct net_device *dev, |
7a3f4a18 MS |
1208 | struct nlattr *tb[], struct nlattr *data[], |
1209 | struct netlink_ext_ack *extack) | |
993e6f2f OH |
1210 | { |
1211 | return -EOPNOTSUPP; | |
1212 | } | |
1213 | ||
25e1ed6e OH |
1214 | static void can_dellink(struct net_device *dev, struct list_head *head) |
1215 | { | |
25e1ed6e OH |
1216 | } |
1217 | ||
39549eef WG |
1218 | static struct rtnl_link_ops can_link_ops __read_mostly = { |
1219 | .kind = "can", | |
1220 | .maxtype = IFLA_CAN_MAX, | |
1221 | .policy = can_policy, | |
1222 | .setup = can_setup, | |
bb208f14 | 1223 | .validate = can_validate, |
993e6f2f | 1224 | .newlink = can_newlink, |
39549eef | 1225 | .changelink = can_changelink, |
25e1ed6e | 1226 | .dellink = can_dellink, |
53a0ef86 | 1227 | .get_size = can_get_size, |
39549eef | 1228 | .fill_info = can_fill_info, |
55369c0a | 1229 | .get_xstats_size = can_get_xstats_size, |
39549eef WG |
1230 | .fill_xstats = can_fill_xstats, |
1231 | }; | |
1232 | ||
ee9a5f5e | 1233 | /* Register the CAN network device */ |
39549eef WG |
1234 | int register_candev(struct net_device *dev) |
1235 | { | |
12a6075c OH |
1236 | struct can_priv *priv = netdev_priv(dev); |
1237 | ||
1238 | /* Ensure termination_const, termination_const_cnt and | |
1239 | * do_set_termination consistency. All must be either set or | |
1240 | * unset. | |
1241 | */ | |
1242 | if ((!priv->termination_const != !priv->termination_const_cnt) || | |
1243 | (!priv->termination_const != !priv->do_set_termination)) | |
1244 | return -EINVAL; | |
1245 | ||
431af779 MKB |
1246 | if (!priv->bitrate_const != !priv->bitrate_const_cnt) |
1247 | return -EINVAL; | |
1248 | ||
1249 | if (!priv->data_bitrate_const != !priv->data_bitrate_const_cnt) | |
1250 | return -EINVAL; | |
1251 | ||
39549eef | 1252 | dev->rtnl_link_ops = &can_link_ops; |
c6384560 RV |
1253 | netif_carrier_off(dev); |
1254 | ||
39549eef WG |
1255 | return register_netdev(dev); |
1256 | } | |
1257 | EXPORT_SYMBOL_GPL(register_candev); | |
1258 | ||
ee9a5f5e | 1259 | /* Unregister the CAN network device */ |
39549eef WG |
1260 | void unregister_candev(struct net_device *dev) |
1261 | { | |
1262 | unregister_netdev(dev); | |
1263 | } | |
1264 | EXPORT_SYMBOL_GPL(unregister_candev); | |
1265 | ||
ee9a5f5e | 1266 | /* Test if a network device is a candev based device |
bf03a537 KVD |
1267 | * and return the can_priv* if so. |
1268 | */ | |
1269 | struct can_priv *safe_candev_priv(struct net_device *dev) | |
1270 | { | |
39fe6fd5 | 1271 | if (dev->type != ARPHRD_CAN || dev->rtnl_link_ops != &can_link_ops) |
bf03a537 KVD |
1272 | return NULL; |
1273 | ||
1274 | return netdev_priv(dev); | |
1275 | } | |
1276 | EXPORT_SYMBOL_GPL(safe_candev_priv); | |
1277 | ||
39549eef WG |
1278 | static __init int can_dev_init(void) |
1279 | { | |
1280 | int err; | |
1281 | ||
a1ef7bd9 KVD |
1282 | can_led_notifier_init(); |
1283 | ||
39549eef WG |
1284 | err = rtnl_link_register(&can_link_ops); |
1285 | if (!err) | |
13ecee77 | 1286 | pr_info(MOD_DESC "\n"); |
39549eef WG |
1287 | |
1288 | return err; | |
1289 | } | |
1290 | module_init(can_dev_init); | |
1291 | ||
1292 | static __exit void can_dev_exit(void) | |
1293 | { | |
1294 | rtnl_link_unregister(&can_link_ops); | |
a1ef7bd9 KVD |
1295 | |
1296 | can_led_notifier_exit(); | |
39549eef WG |
1297 | } |
1298 | module_exit(can_dev_exit); | |
1299 | ||
1300 | MODULE_ALIAS_RTNL_LINK("can"); |