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>
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
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/can.h>
25 #include <linux/can/dev.h>
26 #include <linux/can/skb.h>
27 #include <linux/can/netlink.h>
28 #include <linux/can/led.h>
29 #include <net/rtnetlink.h>
31 #define MOD_DESC "CAN device driver interface"
33 MODULE_DESCRIPTION(MOD_DESC
);
34 MODULE_LICENSE("GPL v2");
35 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
37 /* CAN DLC to real data length conversion helpers */
39 static const u8 dlc2len
[] = {0, 1, 2, 3, 4, 5, 6, 7,
40 8, 12, 16, 20, 24, 32, 48, 64};
42 /* get data length from can_dlc with sanitized can_dlc */
43 u8
can_dlc2len(u8 can_dlc
)
45 return dlc2len
[can_dlc
& 0x0F];
47 EXPORT_SYMBOL_GPL(can_dlc2len
);
49 static const u8 len2dlc
[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
50 9, 9, 9, 9, /* 9 - 12 */
51 10, 10, 10, 10, /* 13 - 16 */
52 11, 11, 11, 11, /* 17 - 20 */
53 12, 12, 12, 12, /* 21 - 24 */
54 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
55 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
56 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
57 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
58 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */
60 /* map the sanitized data length to an appropriate data length code */
61 u8
can_len2dlc(u8 len
)
63 if (unlikely(len
> 64))
68 EXPORT_SYMBOL_GPL(can_len2dlc
);
70 #ifdef CONFIG_CAN_CALC_BITTIMING
71 #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
74 * Bit-timing calculation derived from:
76 * Code based on LinCAN sources and H8S2638 project
77 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
78 * Copyright 2005 Stanislav Marek
79 * email: pisa@cmp.felk.cvut.cz
81 * Calculates proper bit-timing parameters for a specified bit-rate
82 * and sample-point, which can then be used to set the bit-timing
83 * registers of the CAN controller. You can find more information
84 * in the header file linux/can/netlink.h.
86 static int can_update_spt(const struct can_bittiming_const
*btc
,
87 int sampl_pt
, int tseg
, int *tseg1
, int *tseg2
)
89 *tseg2
= tseg
+ 1 - (sampl_pt
* (tseg
+ 1)) / 1000;
90 if (*tseg2
< btc
->tseg2_min
)
91 *tseg2
= btc
->tseg2_min
;
92 if (*tseg2
> btc
->tseg2_max
)
93 *tseg2
= btc
->tseg2_max
;
94 *tseg1
= tseg
- *tseg2
;
95 if (*tseg1
> btc
->tseg1_max
) {
96 *tseg1
= btc
->tseg1_max
;
97 *tseg2
= tseg
- *tseg1
;
99 return 1000 * (tseg
+ 1 - *tseg2
) / (tseg
+ 1);
102 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
104 struct can_priv
*priv
= netdev_priv(dev
);
105 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
106 long rate
, best_rate
= 0;
107 long best_error
= 1000000000, error
= 0;
108 int best_tseg
= 0, best_brp
= 0, brp
= 0;
109 int tsegall
, tseg
= 0, tseg1
= 0, tseg2
= 0;
110 int spt_error
= 1000, spt
= 0, sampl_pt
;
113 if (!priv
->bittiming_const
)
116 /* Use CIA recommended sample points */
117 if (bt
->sample_point
) {
118 sampl_pt
= bt
->sample_point
;
120 if (bt
->bitrate
> 800000)
122 else if (bt
->bitrate
> 500000)
128 /* tseg even = round down, odd = round up */
129 for (tseg
= (btc
->tseg1_max
+ btc
->tseg2_max
) * 2 + 1;
130 tseg
>= (btc
->tseg1_min
+ btc
->tseg2_min
) * 2; tseg
--) {
131 tsegall
= 1 + tseg
/ 2;
132 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
133 brp
= priv
->clock
.freq
/ (tsegall
* bt
->bitrate
) + tseg
% 2;
134 /* chose brp step which is possible in system */
135 brp
= (brp
/ btc
->brp_inc
) * btc
->brp_inc
;
136 if ((brp
< btc
->brp_min
) || (brp
> btc
->brp_max
))
138 rate
= priv
->clock
.freq
/ (brp
* tsegall
);
139 error
= bt
->bitrate
- rate
;
140 /* tseg brp biterror */
143 if (error
> best_error
)
147 spt
= can_update_spt(btc
, sampl_pt
, tseg
/ 2,
149 error
= sampl_pt
- spt
;
152 if (error
> spt_error
)
156 best_tseg
= tseg
/ 2;
164 /* Error in one-tenth of a percent */
165 error
= (best_error
* 1000) / bt
->bitrate
;
166 if (error
> CAN_CALC_MAX_ERROR
) {
168 "bitrate error %ld.%ld%% too high\n",
169 error
/ 10, error
% 10);
172 netdev_warn(dev
, "bitrate error %ld.%ld%%\n",
173 error
/ 10, error
% 10);
177 /* real sample point */
178 bt
->sample_point
= can_update_spt(btc
, sampl_pt
, best_tseg
,
181 v64
= (u64
)best_brp
* 1000000000UL;
182 do_div(v64
, priv
->clock
.freq
);
184 bt
->prop_seg
= tseg1
/ 2;
185 bt
->phase_seg1
= tseg1
- bt
->prop_seg
;
186 bt
->phase_seg2
= tseg2
;
188 /* check for sjw user settings */
189 if (!bt
->sjw
|| !btc
->sjw_max
)
192 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
193 if (bt
->sjw
> btc
->sjw_max
)
194 bt
->sjw
= btc
->sjw_max
;
195 /* bt->sjw must not be higher than tseg2 */
202 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* (tseg1
+ tseg2
+ 1));
206 #else /* !CONFIG_CAN_CALC_BITTIMING */
207 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
209 netdev_err(dev
, "bit-timing calculation not available\n");
212 #endif /* CONFIG_CAN_CALC_BITTIMING */
215 * Checks the validity of the specified bit-timing parameters prop_seg,
216 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
217 * prescaler value brp. You can find more information in the header
218 * file linux/can/netlink.h.
220 static int can_fixup_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
222 struct can_priv
*priv
= netdev_priv(dev
);
223 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
227 if (!priv
->bittiming_const
)
230 tseg1
= bt
->prop_seg
+ bt
->phase_seg1
;
233 if (bt
->sjw
> btc
->sjw_max
||
234 tseg1
< btc
->tseg1_min
|| tseg1
> btc
->tseg1_max
||
235 bt
->phase_seg2
< btc
->tseg2_min
|| bt
->phase_seg2
> btc
->tseg2_max
)
238 brp64
= (u64
)priv
->clock
.freq
* (u64
)bt
->tq
;
239 if (btc
->brp_inc
> 1)
240 do_div(brp64
, btc
->brp_inc
);
241 brp64
+= 500000000UL - 1;
242 do_div(brp64
, 1000000000UL); /* the practicable BRP */
243 if (btc
->brp_inc
> 1)
244 brp64
*= btc
->brp_inc
;
245 bt
->brp
= (u32
)brp64
;
247 if (bt
->brp
< btc
->brp_min
|| bt
->brp
> btc
->brp_max
)
250 alltseg
= bt
->prop_seg
+ bt
->phase_seg1
+ bt
->phase_seg2
+ 1;
251 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* alltseg
);
252 bt
->sample_point
= ((tseg1
+ 1) * 1000) / alltseg
;
257 static int can_get_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
259 struct can_priv
*priv
= netdev_priv(dev
);
262 /* Check if the CAN device has bit-timing parameters */
263 if (priv
->bittiming_const
) {
265 /* Non-expert mode? Check if the bitrate has been pre-defined */
267 /* Determine bit-timing parameters */
268 err
= can_calc_bittiming(dev
, bt
);
270 /* Check bit-timing params and calculate proper brp */
271 err
= can_fixup_bittiming(dev
, bt
);
280 * Local echo of CAN messages
282 * CAN network devices *should* support a local echo functionality
283 * (see Documentation/networking/can.txt). To test the handling of CAN
284 * interfaces that do not support the local echo both driver types are
285 * implemented. In the case that the driver does not support the echo
286 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
287 * to perform the echo as a fallback solution.
289 static void can_flush_echo_skb(struct net_device
*dev
)
291 struct can_priv
*priv
= netdev_priv(dev
);
292 struct net_device_stats
*stats
= &dev
->stats
;
295 for (i
= 0; i
< priv
->echo_skb_max
; i
++) {
296 if (priv
->echo_skb
[i
]) {
297 kfree_skb(priv
->echo_skb
[i
]);
298 priv
->echo_skb
[i
] = NULL
;
300 stats
->tx_aborted_errors
++;
306 * Put the skb on the stack to be looped backed locally lateron
308 * The function is typically called in the start_xmit function
309 * of the device driver. The driver must protect access to
310 * priv->echo_skb, if necessary.
312 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
315 struct can_priv
*priv
= netdev_priv(dev
);
317 BUG_ON(idx
>= priv
->echo_skb_max
);
319 /* check flag whether this packet has to be looped back */
320 if (!(dev
->flags
& IFF_ECHO
) || skb
->pkt_type
!= PACKET_LOOPBACK
) {
325 if (!priv
->echo_skb
[idx
]) {
326 struct sock
*srcsk
= skb
->sk
;
328 if (atomic_read(&skb
->users
) != 1) {
329 struct sk_buff
*old_skb
= skb
;
331 skb
= skb_clone(old_skb
, GFP_ATOMIC
);
340 /* make settings for echo to reduce code in irq context */
341 skb
->protocol
= htons(ETH_P_CAN
);
342 skb
->pkt_type
= PACKET_BROADCAST
;
343 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
346 /* save this skb for tx interrupt echo handling */
347 priv
->echo_skb
[idx
] = skb
;
349 /* locking problem with netif_stop_queue() ?? */
350 netdev_err(dev
, "%s: BUG! echo_skb is occupied!\n", __func__
);
354 EXPORT_SYMBOL_GPL(can_put_echo_skb
);
357 * Get the skb from the stack and loop it back locally
359 * The function is typically called when the TX done interrupt
360 * is handled in the device driver. The driver must protect
361 * access to priv->echo_skb, if necessary.
363 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
)
365 struct can_priv
*priv
= netdev_priv(dev
);
367 BUG_ON(idx
>= priv
->echo_skb_max
);
369 if (priv
->echo_skb
[idx
]) {
370 struct sk_buff
*skb
= priv
->echo_skb
[idx
];
371 struct can_frame
*cf
= (struct can_frame
*)skb
->data
;
372 u8 dlc
= cf
->can_dlc
;
374 netif_rx(priv
->echo_skb
[idx
]);
375 priv
->echo_skb
[idx
] = NULL
;
382 EXPORT_SYMBOL_GPL(can_get_echo_skb
);
385 * Remove the skb from the stack and free it.
387 * The function is typically called when TX failed.
389 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
)
391 struct can_priv
*priv
= netdev_priv(dev
);
393 BUG_ON(idx
>= priv
->echo_skb_max
);
395 if (priv
->echo_skb
[idx
]) {
396 kfree_skb(priv
->echo_skb
[idx
]);
397 priv
->echo_skb
[idx
] = NULL
;
400 EXPORT_SYMBOL_GPL(can_free_echo_skb
);
403 * CAN device restart for bus-off recovery
405 static void can_restart(unsigned long data
)
407 struct net_device
*dev
= (struct net_device
*)data
;
408 struct can_priv
*priv
= netdev_priv(dev
);
409 struct net_device_stats
*stats
= &dev
->stats
;
411 struct can_frame
*cf
;
414 BUG_ON(netif_carrier_ok(dev
));
417 * No synchronization needed because the device is bus-off and
418 * no messages can come in or go out.
420 can_flush_echo_skb(dev
);
422 /* send restart message upstream */
423 skb
= alloc_can_err_skb(dev
, &cf
);
428 cf
->can_id
|= CAN_ERR_RESTARTED
;
433 stats
->rx_bytes
+= cf
->can_dlc
;
436 netdev_dbg(dev
, "restarted\n");
437 priv
->can_stats
.restarts
++;
439 /* Now restart the device */
440 err
= priv
->do_set_mode(dev
, CAN_MODE_START
);
442 netif_carrier_on(dev
);
444 netdev_err(dev
, "Error %d during restart", err
);
447 int can_restart_now(struct net_device
*dev
)
449 struct can_priv
*priv
= netdev_priv(dev
);
452 * A manual restart is only permitted if automatic restart is
453 * disabled and the device is in the bus-off state
455 if (priv
->restart_ms
)
457 if (priv
->state
!= CAN_STATE_BUS_OFF
)
460 /* Runs as soon as possible in the timer context */
461 mod_timer(&priv
->restart_timer
, jiffies
);
469 * This functions should be called when the device goes bus-off to
470 * tell the netif layer that no more packets can be sent or received.
471 * If enabled, a timer is started to trigger bus-off recovery.
473 void can_bus_off(struct net_device
*dev
)
475 struct can_priv
*priv
= netdev_priv(dev
);
477 netdev_dbg(dev
, "bus-off\n");
479 netif_carrier_off(dev
);
480 priv
->can_stats
.bus_off
++;
482 if (priv
->restart_ms
)
483 mod_timer(&priv
->restart_timer
,
484 jiffies
+ (priv
->restart_ms
* HZ
) / 1000);
486 EXPORT_SYMBOL_GPL(can_bus_off
);
488 static void can_setup(struct net_device
*dev
)
490 dev
->type
= ARPHRD_CAN
;
492 dev
->hard_header_len
= 0;
494 dev
->tx_queue_len
= 10;
496 /* New-style flags. */
497 dev
->flags
= IFF_NOARP
;
498 dev
->features
= NETIF_F_HW_CSUM
;
501 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
)
505 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
506 sizeof(struct can_frame
));
510 skb
->protocol
= htons(ETH_P_CAN
);
511 skb
->pkt_type
= PACKET_BROADCAST
;
512 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
514 can_skb_reserve(skb
);
515 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
517 *cf
= (struct can_frame
*)skb_put(skb
, sizeof(struct can_frame
));
518 memset(*cf
, 0, sizeof(struct can_frame
));
522 EXPORT_SYMBOL_GPL(alloc_can_skb
);
524 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
, struct can_frame
**cf
)
528 skb
= alloc_can_skb(dev
, cf
);
532 (*cf
)->can_id
= CAN_ERR_FLAG
;
533 (*cf
)->can_dlc
= CAN_ERR_DLC
;
537 EXPORT_SYMBOL_GPL(alloc_can_err_skb
);
540 * Allocate and setup space for the CAN network device
542 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
)
544 struct net_device
*dev
;
545 struct can_priv
*priv
;
549 size
= ALIGN(sizeof_priv
, sizeof(struct sk_buff
*)) +
550 echo_skb_max
* sizeof(struct sk_buff
*);
554 dev
= alloc_netdev(size
, "can%d", can_setup
);
558 priv
= netdev_priv(dev
);
561 priv
->echo_skb_max
= echo_skb_max
;
562 priv
->echo_skb
= (void *)priv
+
563 ALIGN(sizeof_priv
, sizeof(struct sk_buff
*));
566 priv
->state
= CAN_STATE_STOPPED
;
568 init_timer(&priv
->restart_timer
);
572 EXPORT_SYMBOL_GPL(alloc_candev
);
575 * Free space of the CAN network device
577 void free_candev(struct net_device
*dev
)
581 EXPORT_SYMBOL_GPL(free_candev
);
584 * Common open function when the device gets opened.
586 * This function should be called in the open function of the device
589 int open_candev(struct net_device
*dev
)
591 struct can_priv
*priv
= netdev_priv(dev
);
593 if (!priv
->bittiming
.tq
&& !priv
->bittiming
.bitrate
) {
594 netdev_err(dev
, "bit-timing not yet defined\n");
598 /* Switch carrier on if device was stopped while in bus-off state */
599 if (!netif_carrier_ok(dev
))
600 netif_carrier_on(dev
);
602 setup_timer(&priv
->restart_timer
, can_restart
, (unsigned long)dev
);
606 EXPORT_SYMBOL_GPL(open_candev
);
609 * Common close function for cleanup before the device gets closed.
611 * This function should be called in the close function of the device
614 void close_candev(struct net_device
*dev
)
616 struct can_priv
*priv
= netdev_priv(dev
);
618 del_timer_sync(&priv
->restart_timer
);
619 can_flush_echo_skb(dev
);
621 EXPORT_SYMBOL_GPL(close_candev
);
624 * CAN netlink interface
626 static const struct nla_policy can_policy
[IFLA_CAN_MAX
+ 1] = {
627 [IFLA_CAN_STATE
] = { .type
= NLA_U32
},
628 [IFLA_CAN_CTRLMODE
] = { .len
= sizeof(struct can_ctrlmode
) },
629 [IFLA_CAN_RESTART_MS
] = { .type
= NLA_U32
},
630 [IFLA_CAN_RESTART
] = { .type
= NLA_U32
},
631 [IFLA_CAN_BITTIMING
] = { .len
= sizeof(struct can_bittiming
) },
632 [IFLA_CAN_BITTIMING_CONST
]
633 = { .len
= sizeof(struct can_bittiming_const
) },
634 [IFLA_CAN_CLOCK
] = { .len
= sizeof(struct can_clock
) },
635 [IFLA_CAN_BERR_COUNTER
] = { .len
= sizeof(struct can_berr_counter
) },
638 static int can_changelink(struct net_device
*dev
,
639 struct nlattr
*tb
[], struct nlattr
*data
[])
641 struct can_priv
*priv
= netdev_priv(dev
);
644 /* We need synchronization with dev->stop() */
647 if (data
[IFLA_CAN_BITTIMING
]) {
648 struct can_bittiming bt
;
650 /* Do not allow changing bittiming while running */
651 if (dev
->flags
& IFF_UP
)
653 memcpy(&bt
, nla_data(data
[IFLA_CAN_BITTIMING
]), sizeof(bt
));
654 if ((!bt
.bitrate
&& !bt
.tq
) || (bt
.bitrate
&& bt
.tq
))
656 err
= can_get_bittiming(dev
, &bt
);
659 memcpy(&priv
->bittiming
, &bt
, sizeof(bt
));
661 if (priv
->do_set_bittiming
) {
662 /* Finally, set the bit-timing registers */
663 err
= priv
->do_set_bittiming(dev
);
669 if (data
[IFLA_CAN_CTRLMODE
]) {
670 struct can_ctrlmode
*cm
;
672 /* Do not allow changing controller mode while running */
673 if (dev
->flags
& IFF_UP
)
675 cm
= nla_data(data
[IFLA_CAN_CTRLMODE
]);
676 if (cm
->flags
& ~priv
->ctrlmode_supported
)
678 priv
->ctrlmode
&= ~cm
->mask
;
679 priv
->ctrlmode
|= cm
->flags
;
682 if (data
[IFLA_CAN_RESTART_MS
]) {
683 /* Do not allow changing restart delay while running */
684 if (dev
->flags
& IFF_UP
)
686 priv
->restart_ms
= nla_get_u32(data
[IFLA_CAN_RESTART_MS
]);
689 if (data
[IFLA_CAN_RESTART
]) {
690 /* Do not allow a restart while not running */
691 if (!(dev
->flags
& IFF_UP
))
693 err
= can_restart_now(dev
);
701 static size_t can_get_size(const struct net_device
*dev
)
703 struct can_priv
*priv
= netdev_priv(dev
);
706 size
+= nla_total_size(sizeof(struct can_bittiming
)); /* IFLA_CAN_BITTIMING */
707 if (priv
->bittiming_const
) /* IFLA_CAN_BITTIMING_CONST */
708 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
709 size
+= nla_total_size(sizeof(struct can_clock
)); /* IFLA_CAN_CLOCK */
710 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_STATE */
711 size
+= nla_total_size(sizeof(struct can_ctrlmode
)); /* IFLA_CAN_CTRLMODE */
712 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_RESTART_MS */
713 if (priv
->do_get_berr_counter
) /* IFLA_CAN_BERR_COUNTER */
714 size
+= nla_total_size(sizeof(struct can_berr_counter
));
719 static int can_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
721 struct can_priv
*priv
= netdev_priv(dev
);
722 struct can_ctrlmode cm
= {.flags
= priv
->ctrlmode
};
723 struct can_berr_counter bec
;
724 enum can_state state
= priv
->state
;
726 if (priv
->do_get_state
)
727 priv
->do_get_state(dev
, &state
);
728 if (nla_put(skb
, IFLA_CAN_BITTIMING
,
729 sizeof(priv
->bittiming
), &priv
->bittiming
) ||
730 (priv
->bittiming_const
&&
731 nla_put(skb
, IFLA_CAN_BITTIMING_CONST
,
732 sizeof(*priv
->bittiming_const
), priv
->bittiming_const
)) ||
733 nla_put(skb
, IFLA_CAN_CLOCK
, sizeof(cm
), &priv
->clock
) ||
734 nla_put_u32(skb
, IFLA_CAN_STATE
, state
) ||
735 nla_put(skb
, IFLA_CAN_CTRLMODE
, sizeof(cm
), &cm
) ||
736 nla_put_u32(skb
, IFLA_CAN_RESTART_MS
, priv
->restart_ms
) ||
737 (priv
->do_get_berr_counter
&&
738 !priv
->do_get_berr_counter(dev
, &bec
) &&
739 nla_put(skb
, IFLA_CAN_BERR_COUNTER
, sizeof(bec
), &bec
)))
744 static size_t can_get_xstats_size(const struct net_device
*dev
)
746 return sizeof(struct can_device_stats
);
749 static int can_fill_xstats(struct sk_buff
*skb
, const struct net_device
*dev
)
751 struct can_priv
*priv
= netdev_priv(dev
);
753 if (nla_put(skb
, IFLA_INFO_XSTATS
,
754 sizeof(priv
->can_stats
), &priv
->can_stats
))
755 goto nla_put_failure
;
762 static int can_newlink(struct net
*src_net
, struct net_device
*dev
,
763 struct nlattr
*tb
[], struct nlattr
*data
[])
768 static struct rtnl_link_ops can_link_ops __read_mostly
= {
770 .maxtype
= IFLA_CAN_MAX
,
771 .policy
= can_policy
,
773 .newlink
= can_newlink
,
774 .changelink
= can_changelink
,
775 .get_size
= can_get_size
,
776 .fill_info
= can_fill_info
,
777 .get_xstats_size
= can_get_xstats_size
,
778 .fill_xstats
= can_fill_xstats
,
782 * Register the CAN network device
784 int register_candev(struct net_device
*dev
)
786 dev
->rtnl_link_ops
= &can_link_ops
;
787 return register_netdev(dev
);
789 EXPORT_SYMBOL_GPL(register_candev
);
792 * Unregister the CAN network device
794 void unregister_candev(struct net_device
*dev
)
796 unregister_netdev(dev
);
798 EXPORT_SYMBOL_GPL(unregister_candev
);
801 * Test if a network device is a candev based device
802 * and return the can_priv* if so.
804 struct can_priv
*safe_candev_priv(struct net_device
*dev
)
806 if ((dev
->type
!= ARPHRD_CAN
) || (dev
->rtnl_link_ops
!= &can_link_ops
))
809 return netdev_priv(dev
);
811 EXPORT_SYMBOL_GPL(safe_candev_priv
);
813 static __init
int can_dev_init(void)
817 can_led_notifier_init();
819 err
= rtnl_link_register(&can_link_ops
);
821 printk(KERN_INFO MOD_DESC
"\n");
825 module_init(can_dev_init
);
827 static __exit
void can_dev_exit(void)
829 rtnl_link_unregister(&can_link_ops
);
831 can_led_notifier_exit();
833 module_exit(can_dev_exit
);
835 MODULE_ALIAS_RTNL_LINK("can");