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