dev.c revision aabdfd6adb804d0aaba0188ade0f1afe42a52e31
1/* 2 * Copyright (C) 2005 Marc Kleine-Budde, Pengutronix 3 * Copyright (C) 2006 Andrey Volkov, Varma Electronics 4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the version 2 of the GNU General Public License 8 * as published by the Free Software Foundation 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20#include <linux/module.h> 21#include <linux/kernel.h> 22#include <linux/slab.h> 23#include <linux/netdevice.h> 24#include <linux/if_arp.h> 25#include <linux/can.h> 26#include <linux/can/dev.h> 27#include <linux/can/netlink.h> 28#include <net/rtnetlink.h> 29 30#define MOD_DESC "CAN device driver interface" 31 32MODULE_DESCRIPTION(MOD_DESC); 33MODULE_LICENSE("GPL v2"); 34MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); 35 36#ifdef CONFIG_CAN_CALC_BITTIMING 37#define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */ 38 39/* 40 * Bit-timing calculation derived from: 41 * 42 * Code based on LinCAN sources and H8S2638 project 43 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz 44 * Copyright 2005 Stanislav Marek 45 * email: pisa@cmp.felk.cvut.cz 46 * 47 * Calculates proper bit-timing parameters for a specified bit-rate 48 * and sample-point, which can then be used to set the bit-timing 49 * registers of the CAN controller. You can find more information 50 * in the header file linux/can/netlink.h. 51 */ 52static int can_update_spt(const struct can_bittiming_const *btc, 53 int sampl_pt, int tseg, int *tseg1, int *tseg2) 54{ 55 *tseg2 = tseg + 1 - (sampl_pt * (tseg + 1)) / 1000; 56 if (*tseg2 < btc->tseg2_min) 57 *tseg2 = btc->tseg2_min; 58 if (*tseg2 > btc->tseg2_max) 59 *tseg2 = btc->tseg2_max; 60 *tseg1 = tseg - *tseg2; 61 if (*tseg1 > btc->tseg1_max) { 62 *tseg1 = btc->tseg1_max; 63 *tseg2 = tseg - *tseg1; 64 } 65 return 1000 * (tseg + 1 - *tseg2) / (tseg + 1); 66} 67 68static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt) 69{ 70 struct can_priv *priv = netdev_priv(dev); 71 const struct can_bittiming_const *btc = priv->bittiming_const; 72 long rate, best_rate = 0; 73 long best_error = 1000000000, error = 0; 74 int best_tseg = 0, best_brp = 0, brp = 0; 75 int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0; 76 int spt_error = 1000, spt = 0, sampl_pt; 77 u64 v64; 78 79 if (!priv->bittiming_const) 80 return -ENOTSUPP; 81 82 /* Use CIA recommended sample points */ 83 if (bt->sample_point) { 84 sampl_pt = bt->sample_point; 85 } else { 86 if (bt->bitrate > 800000) 87 sampl_pt = 750; 88 else if (bt->bitrate > 500000) 89 sampl_pt = 800; 90 else 91 sampl_pt = 875; 92 } 93 94 /* tseg even = round down, odd = round up */ 95 for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1; 96 tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) { 97 tsegall = 1 + tseg / 2; 98 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */ 99 brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2; 100 /* chose brp step which is possible in system */ 101 brp = (brp / btc->brp_inc) * btc->brp_inc; 102 if ((brp < btc->brp_min) || (brp > btc->brp_max)) 103 continue; 104 rate = priv->clock.freq / (brp * tsegall); 105 error = bt->bitrate - rate; 106 /* tseg brp biterror */ 107 if (error < 0) 108 error = -error; 109 if (error > best_error) 110 continue; 111 best_error = error; 112 if (error == 0) { 113 spt = can_update_spt(btc, sampl_pt, tseg / 2, 114 &tseg1, &tseg2); 115 error = sampl_pt - spt; 116 if (error < 0) 117 error = -error; 118 if (error > spt_error) 119 continue; 120 spt_error = error; 121 } 122 best_tseg = tseg / 2; 123 best_brp = brp; 124 best_rate = rate; 125 if (error == 0) 126 break; 127 } 128 129 if (best_error) { 130 /* Error in one-tenth of a percent */ 131 error = (best_error * 1000) / bt->bitrate; 132 if (error > CAN_CALC_MAX_ERROR) { 133 netdev_err(dev, 134 "bitrate error %ld.%ld%% too high\n", 135 error / 10, error % 10); 136 return -EDOM; 137 } else { 138 netdev_warn(dev, "bitrate error %ld.%ld%%\n", 139 error / 10, error % 10); 140 } 141 } 142 143 /* real sample point */ 144 bt->sample_point = can_update_spt(btc, sampl_pt, best_tseg, 145 &tseg1, &tseg2); 146 147 v64 = (u64)best_brp * 1000000000UL; 148 do_div(v64, priv->clock.freq); 149 bt->tq = (u32)v64; 150 bt->prop_seg = tseg1 / 2; 151 bt->phase_seg1 = tseg1 - bt->prop_seg; 152 bt->phase_seg2 = tseg2; 153 154 /* check for sjw user settings */ 155 if (!bt->sjw || !btc->sjw_max) 156 bt->sjw = 1; 157 else { 158 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */ 159 if (bt->sjw > btc->sjw_max) 160 bt->sjw = btc->sjw_max; 161 /* bt->sjw must not be higher than tseg2 */ 162 if (tseg2 < bt->sjw) 163 bt->sjw = tseg2; 164 } 165 166 bt->brp = best_brp; 167 /* real bit-rate */ 168 bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1)); 169 170 return 0; 171} 172#else /* !CONFIG_CAN_CALC_BITTIMING */ 173static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt) 174{ 175 netdev_err(dev, "bit-timing calculation not available\n"); 176 return -EINVAL; 177} 178#endif /* CONFIG_CAN_CALC_BITTIMING */ 179 180/* 181 * Checks the validity of the specified bit-timing parameters prop_seg, 182 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate 183 * prescaler value brp. You can find more information in the header 184 * file linux/can/netlink.h. 185 */ 186static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt) 187{ 188 struct can_priv *priv = netdev_priv(dev); 189 const struct can_bittiming_const *btc = priv->bittiming_const; 190 int tseg1, alltseg; 191 u64 brp64; 192 193 if (!priv->bittiming_const) 194 return -ENOTSUPP; 195 196 tseg1 = bt->prop_seg + bt->phase_seg1; 197 if (!bt->sjw) 198 bt->sjw = 1; 199 if (bt->sjw > btc->sjw_max || 200 tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max || 201 bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max) 202 return -ERANGE; 203 204 brp64 = (u64)priv->clock.freq * (u64)bt->tq; 205 if (btc->brp_inc > 1) 206 do_div(brp64, btc->brp_inc); 207 brp64 += 500000000UL - 1; 208 do_div(brp64, 1000000000UL); /* the practicable BRP */ 209 if (btc->brp_inc > 1) 210 brp64 *= btc->brp_inc; 211 bt->brp = (u32)brp64; 212 213 if (bt->brp < btc->brp_min || bt->brp > btc->brp_max) 214 return -EINVAL; 215 216 alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1; 217 bt->bitrate = priv->clock.freq / (bt->brp * alltseg); 218 bt->sample_point = ((tseg1 + 1) * 1000) / alltseg; 219 220 return 0; 221} 222 223static int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt) 224{ 225 struct can_priv *priv = netdev_priv(dev); 226 int err; 227 228 /* Check if the CAN device has bit-timing parameters */ 229 if (priv->bittiming_const) { 230 231 /* Non-expert mode? Check if the bitrate has been pre-defined */ 232 if (!bt->tq) 233 /* Determine bit-timing parameters */ 234 err = can_calc_bittiming(dev, bt); 235 else 236 /* Check bit-timing params and calculate proper brp */ 237 err = can_fixup_bittiming(dev, bt); 238 if (err) 239 return err; 240 } 241 242 return 0; 243} 244 245/* 246 * Local echo of CAN messages 247 * 248 * CAN network devices *should* support a local echo functionality 249 * (see Documentation/networking/can.txt). To test the handling of CAN 250 * interfaces that do not support the local echo both driver types are 251 * implemented. In the case that the driver does not support the echo 252 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core 253 * to perform the echo as a fallback solution. 254 */ 255static void can_flush_echo_skb(struct net_device *dev) 256{ 257 struct can_priv *priv = netdev_priv(dev); 258 struct net_device_stats *stats = &dev->stats; 259 int i; 260 261 for (i = 0; i < priv->echo_skb_max; i++) { 262 if (priv->echo_skb[i]) { 263 kfree_skb(priv->echo_skb[i]); 264 priv->echo_skb[i] = NULL; 265 stats->tx_dropped++; 266 stats->tx_aborted_errors++; 267 } 268 } 269} 270 271/* 272 * Put the skb on the stack to be looped backed locally lateron 273 * 274 * The function is typically called in the start_xmit function 275 * of the device driver. The driver must protect access to 276 * priv->echo_skb, if necessary. 277 */ 278void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, 279 unsigned int idx) 280{ 281 struct can_priv *priv = netdev_priv(dev); 282 283 BUG_ON(idx >= priv->echo_skb_max); 284 285 /* check flag whether this packet has to be looped back */ 286 if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK) { 287 kfree_skb(skb); 288 return; 289 } 290 291 if (!priv->echo_skb[idx]) { 292 struct sock *srcsk = skb->sk; 293 294 if (atomic_read(&skb->users) != 1) { 295 struct sk_buff *old_skb = skb; 296 297 skb = skb_clone(old_skb, GFP_ATOMIC); 298 kfree_skb(old_skb); 299 if (!skb) 300 return; 301 } else 302 skb_orphan(skb); 303 304 skb->sk = srcsk; 305 306 /* make settings for echo to reduce code in irq context */ 307 skb->protocol = htons(ETH_P_CAN); 308 skb->pkt_type = PACKET_BROADCAST; 309 skb->ip_summed = CHECKSUM_UNNECESSARY; 310 skb->dev = dev; 311 312 /* save this skb for tx interrupt echo handling */ 313 priv->echo_skb[idx] = skb; 314 } else { 315 /* locking problem with netif_stop_queue() ?? */ 316 netdev_err(dev, "%s: BUG! echo_skb is occupied!\n", __func__); 317 kfree_skb(skb); 318 } 319} 320EXPORT_SYMBOL_GPL(can_put_echo_skb); 321 322/* 323 * Get the skb from the stack and loop it back locally 324 * 325 * The function is typically called when the TX done interrupt 326 * is handled in the device driver. The driver must protect 327 * access to priv->echo_skb, if necessary. 328 */ 329unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx) 330{ 331 struct can_priv *priv = netdev_priv(dev); 332 333 BUG_ON(idx >= priv->echo_skb_max); 334 335 if (priv->echo_skb[idx]) { 336 struct sk_buff *skb = priv->echo_skb[idx]; 337 struct can_frame *cf = (struct can_frame *)skb->data; 338 u8 dlc = cf->can_dlc; 339 340 netif_rx(priv->echo_skb[idx]); 341 priv->echo_skb[idx] = NULL; 342 343 return dlc; 344 } 345 346 return 0; 347} 348EXPORT_SYMBOL_GPL(can_get_echo_skb); 349 350/* 351 * Remove the skb from the stack and free it. 352 * 353 * The function is typically called when TX failed. 354 */ 355void can_free_echo_skb(struct net_device *dev, unsigned int idx) 356{ 357 struct can_priv *priv = netdev_priv(dev); 358 359 BUG_ON(idx >= priv->echo_skb_max); 360 361 if (priv->echo_skb[idx]) { 362 kfree_skb(priv->echo_skb[idx]); 363 priv->echo_skb[idx] = NULL; 364 } 365} 366EXPORT_SYMBOL_GPL(can_free_echo_skb); 367 368/* 369 * CAN device restart for bus-off recovery 370 */ 371void can_restart(unsigned long data) 372{ 373 struct net_device *dev = (struct net_device *)data; 374 struct can_priv *priv = netdev_priv(dev); 375 struct net_device_stats *stats = &dev->stats; 376 struct sk_buff *skb; 377 struct can_frame *cf; 378 int err; 379 380 BUG_ON(netif_carrier_ok(dev)); 381 382 /* 383 * No synchronization needed because the device is bus-off and 384 * no messages can come in or go out. 385 */ 386 can_flush_echo_skb(dev); 387 388 /* send restart message upstream */ 389 skb = alloc_can_err_skb(dev, &cf); 390 if (skb == NULL) { 391 err = -ENOMEM; 392 goto restart; 393 } 394 cf->can_id |= CAN_ERR_RESTARTED; 395 396 netif_rx(skb); 397 398 stats->rx_packets++; 399 stats->rx_bytes += cf->can_dlc; 400 401restart: 402 netdev_dbg(dev, "restarted\n"); 403 priv->can_stats.restarts++; 404 405 /* Now restart the device */ 406 err = priv->do_set_mode(dev, CAN_MODE_START); 407 408 netif_carrier_on(dev); 409 if (err) 410 netdev_err(dev, "Error %d during restart", err); 411} 412 413int can_restart_now(struct net_device *dev) 414{ 415 struct can_priv *priv = netdev_priv(dev); 416 417 /* 418 * A manual restart is only permitted if automatic restart is 419 * disabled and the device is in the bus-off state 420 */ 421 if (priv->restart_ms) 422 return -EINVAL; 423 if (priv->state != CAN_STATE_BUS_OFF) 424 return -EBUSY; 425 426 /* Runs as soon as possible in the timer context */ 427 mod_timer(&priv->restart_timer, jiffies); 428 429 return 0; 430} 431 432/* 433 * CAN bus-off 434 * 435 * This functions should be called when the device goes bus-off to 436 * tell the netif layer that no more packets can be sent or received. 437 * If enabled, a timer is started to trigger bus-off recovery. 438 */ 439void can_bus_off(struct net_device *dev) 440{ 441 struct can_priv *priv = netdev_priv(dev); 442 443 netdev_dbg(dev, "bus-off\n"); 444 445 netif_carrier_off(dev); 446 priv->can_stats.bus_off++; 447 448 if (priv->restart_ms) 449 mod_timer(&priv->restart_timer, 450 jiffies + (priv->restart_ms * HZ) / 1000); 451} 452EXPORT_SYMBOL_GPL(can_bus_off); 453 454static void can_setup(struct net_device *dev) 455{ 456 dev->type = ARPHRD_CAN; 457 dev->mtu = sizeof(struct can_frame); 458 dev->hard_header_len = 0; 459 dev->addr_len = 0; 460 dev->tx_queue_len = 10; 461 462 /* New-style flags. */ 463 dev->flags = IFF_NOARP; 464 dev->features = NETIF_F_HW_CSUM; 465} 466 467struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf) 468{ 469 struct sk_buff *skb; 470 471 skb = netdev_alloc_skb(dev, sizeof(struct can_frame)); 472 if (unlikely(!skb)) 473 return NULL; 474 475 skb->protocol = htons(ETH_P_CAN); 476 skb->pkt_type = PACKET_BROADCAST; 477 skb->ip_summed = CHECKSUM_UNNECESSARY; 478 *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame)); 479 memset(*cf, 0, sizeof(struct can_frame)); 480 481 return skb; 482} 483EXPORT_SYMBOL_GPL(alloc_can_skb); 484 485struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf) 486{ 487 struct sk_buff *skb; 488 489 skb = alloc_can_skb(dev, cf); 490 if (unlikely(!skb)) 491 return NULL; 492 493 (*cf)->can_id = CAN_ERR_FLAG; 494 (*cf)->can_dlc = CAN_ERR_DLC; 495 496 return skb; 497} 498EXPORT_SYMBOL_GPL(alloc_can_err_skb); 499 500/* 501 * Allocate and setup space for the CAN network device 502 */ 503struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max) 504{ 505 struct net_device *dev; 506 struct can_priv *priv; 507 int size; 508 509 if (echo_skb_max) 510 size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) + 511 echo_skb_max * sizeof(struct sk_buff *); 512 else 513 size = sizeof_priv; 514 515 dev = alloc_netdev(size, "can%d", can_setup); 516 if (!dev) 517 return NULL; 518 519 priv = netdev_priv(dev); 520 521 if (echo_skb_max) { 522 priv->echo_skb_max = echo_skb_max; 523 priv->echo_skb = (void *)priv + 524 ALIGN(sizeof_priv, sizeof(struct sk_buff *)); 525 } 526 527 priv->state = CAN_STATE_STOPPED; 528 529 init_timer(&priv->restart_timer); 530 531 return dev; 532} 533EXPORT_SYMBOL_GPL(alloc_candev); 534 535/* 536 * Free space of the CAN network device 537 */ 538void free_candev(struct net_device *dev) 539{ 540 free_netdev(dev); 541} 542EXPORT_SYMBOL_GPL(free_candev); 543 544/* 545 * Common open function when the device gets opened. 546 * 547 * This function should be called in the open function of the device 548 * driver. 549 */ 550int open_candev(struct net_device *dev) 551{ 552 struct can_priv *priv = netdev_priv(dev); 553 554 if (!priv->bittiming.tq && !priv->bittiming.bitrate) { 555 netdev_err(dev, "bit-timing not yet defined\n"); 556 return -EINVAL; 557 } 558 559 /* Switch carrier on if device was stopped while in bus-off state */ 560 if (!netif_carrier_ok(dev)) 561 netif_carrier_on(dev); 562 563 setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev); 564 565 return 0; 566} 567EXPORT_SYMBOL_GPL(open_candev); 568 569/* 570 * Common close function for cleanup before the device gets closed. 571 * 572 * This function should be called in the close function of the device 573 * driver. 574 */ 575void close_candev(struct net_device *dev) 576{ 577 struct can_priv *priv = netdev_priv(dev); 578 579 if (del_timer_sync(&priv->restart_timer)) 580 dev_put(dev); 581 can_flush_echo_skb(dev); 582} 583EXPORT_SYMBOL_GPL(close_candev); 584 585/* 586 * CAN netlink interface 587 */ 588static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = { 589 [IFLA_CAN_STATE] = { .type = NLA_U32 }, 590 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) }, 591 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 }, 592 [IFLA_CAN_RESTART] = { .type = NLA_U32 }, 593 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) }, 594 [IFLA_CAN_BITTIMING_CONST] 595 = { .len = sizeof(struct can_bittiming_const) }, 596 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) }, 597 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) }, 598}; 599 600static int can_changelink(struct net_device *dev, 601 struct nlattr *tb[], struct nlattr *data[]) 602{ 603 struct can_priv *priv = netdev_priv(dev); 604 int err; 605 606 /* We need synchronization with dev->stop() */ 607 ASSERT_RTNL(); 608 609 if (data[IFLA_CAN_CTRLMODE]) { 610 struct can_ctrlmode *cm; 611 612 /* Do not allow changing controller mode while running */ 613 if (dev->flags & IFF_UP) 614 return -EBUSY; 615 cm = nla_data(data[IFLA_CAN_CTRLMODE]); 616 if (cm->flags & ~priv->ctrlmode_supported) 617 return -EOPNOTSUPP; 618 priv->ctrlmode &= ~cm->mask; 619 priv->ctrlmode |= cm->flags; 620 } 621 622 if (data[IFLA_CAN_BITTIMING]) { 623 struct can_bittiming bt; 624 625 /* Do not allow changing bittiming while running */ 626 if (dev->flags & IFF_UP) 627 return -EBUSY; 628 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt)); 629 if ((!bt.bitrate && !bt.tq) || (bt.bitrate && bt.tq)) 630 return -EINVAL; 631 err = can_get_bittiming(dev, &bt); 632 if (err) 633 return err; 634 memcpy(&priv->bittiming, &bt, sizeof(bt)); 635 636 if (priv->do_set_bittiming) { 637 /* Finally, set the bit-timing registers */ 638 err = priv->do_set_bittiming(dev); 639 if (err) 640 return err; 641 } 642 } 643 644 if (data[IFLA_CAN_RESTART_MS]) { 645 /* Do not allow changing restart delay while running */ 646 if (dev->flags & IFF_UP) 647 return -EBUSY; 648 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]); 649 } 650 651 if (data[IFLA_CAN_RESTART]) { 652 /* Do not allow a restart while not running */ 653 if (!(dev->flags & IFF_UP)) 654 return -EINVAL; 655 err = can_restart_now(dev); 656 if (err) 657 return err; 658 } 659 660 return 0; 661} 662 663static size_t can_get_size(const struct net_device *dev) 664{ 665 struct can_priv *priv = netdev_priv(dev); 666 size_t size; 667 668 size = nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */ 669 size += sizeof(struct can_ctrlmode); /* IFLA_CAN_CTRLMODE */ 670 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */ 671 size += sizeof(struct can_bittiming); /* IFLA_CAN_BITTIMING */ 672 size += sizeof(struct can_clock); /* IFLA_CAN_CLOCK */ 673 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */ 674 size += sizeof(struct can_berr_counter); 675 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */ 676 size += sizeof(struct can_bittiming_const); 677 678 return size; 679} 680 681static int can_fill_info(struct sk_buff *skb, const struct net_device *dev) 682{ 683 struct can_priv *priv = netdev_priv(dev); 684 struct can_ctrlmode cm = {.flags = priv->ctrlmode}; 685 struct can_berr_counter bec; 686 enum can_state state = priv->state; 687 688 if (priv->do_get_state) 689 priv->do_get_state(dev, &state); 690 NLA_PUT_U32(skb, IFLA_CAN_STATE, state); 691 NLA_PUT(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm); 692 NLA_PUT_U32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms); 693 NLA_PUT(skb, IFLA_CAN_BITTIMING, 694 sizeof(priv->bittiming), &priv->bittiming); 695 NLA_PUT(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock); 696 if (priv->do_get_berr_counter && !priv->do_get_berr_counter(dev, &bec)) 697 NLA_PUT(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec); 698 if (priv->bittiming_const) 699 NLA_PUT(skb, IFLA_CAN_BITTIMING_CONST, 700 sizeof(*priv->bittiming_const), priv->bittiming_const); 701 702 return 0; 703 704nla_put_failure: 705 return -EMSGSIZE; 706} 707 708static size_t can_get_xstats_size(const struct net_device *dev) 709{ 710 return sizeof(struct can_device_stats); 711} 712 713static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev) 714{ 715 struct can_priv *priv = netdev_priv(dev); 716 717 NLA_PUT(skb, IFLA_INFO_XSTATS, 718 sizeof(priv->can_stats), &priv->can_stats); 719 720 return 0; 721 722nla_put_failure: 723 return -EMSGSIZE; 724} 725 726static int can_newlink(struct net *src_net, struct net_device *dev, 727 struct nlattr *tb[], struct nlattr *data[]) 728{ 729 return -EOPNOTSUPP; 730} 731 732static struct rtnl_link_ops can_link_ops __read_mostly = { 733 .kind = "can", 734 .maxtype = IFLA_CAN_MAX, 735 .policy = can_policy, 736 .setup = can_setup, 737 .newlink = can_newlink, 738 .changelink = can_changelink, 739 .get_size = can_get_size, 740 .fill_info = can_fill_info, 741 .get_xstats_size = can_get_xstats_size, 742 .fill_xstats = can_fill_xstats, 743}; 744 745/* 746 * Register the CAN network device 747 */ 748int register_candev(struct net_device *dev) 749{ 750 dev->rtnl_link_ops = &can_link_ops; 751 return register_netdev(dev); 752} 753EXPORT_SYMBOL_GPL(register_candev); 754 755/* 756 * Unregister the CAN network device 757 */ 758void unregister_candev(struct net_device *dev) 759{ 760 unregister_netdev(dev); 761} 762EXPORT_SYMBOL_GPL(unregister_candev); 763 764static __init int can_dev_init(void) 765{ 766 int err; 767 768 err = rtnl_link_register(&can_link_ops); 769 if (!err) 770 printk(KERN_INFO MOD_DESC "\n"); 771 772 return err; 773} 774module_init(can_dev_init); 775 776static __exit void can_dev_exit(void) 777{ 778 rtnl_link_unregister(&can_link_ops); 779} 780module_exit(can_dev_exit); 781 782MODULE_ALIAS_RTNL_LINK("can"); 783