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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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>
30 #define MOD_DESC "CAN device driver interface"
32 MODULE_DESCRIPTION(MOD_DESC
);
33 MODULE_LICENSE("GPL v2");
34 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
36 /* CAN DLC to real data length conversion helpers */
38 static const u8 dlc2len
[] = {0, 1, 2, 3, 4, 5, 6, 7,
39 8, 12, 16, 20, 24, 32, 48, 64};
41 /* get data length from can_dlc with sanitized can_dlc */
42 u8
can_dlc2len(u8 can_dlc
)
44 return dlc2len
[can_dlc
& 0x0F];
46 EXPORT_SYMBOL_GPL(can_dlc2len
);
48 static const u8 len2dlc
[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
49 9, 9, 9, 9, /* 9 - 12 */
50 10, 10, 10, 10, /* 13 - 16 */
51 11, 11, 11, 11, /* 17 - 20 */
52 12, 12, 12, 12, /* 21 - 24 */
53 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
54 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
55 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
56 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
57 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */
59 /* map the sanitized data length to an appropriate data length code */
60 u8
can_len2dlc(u8 len
)
62 if (unlikely(len
> 64))
67 EXPORT_SYMBOL_GPL(can_len2dlc
);
69 #ifdef CONFIG_CAN_CALC_BITTIMING
70 #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
73 * Bit-timing calculation derived from:
75 * Code based on LinCAN sources and H8S2638 project
76 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
77 * Copyright 2005 Stanislav Marek
78 * email: pisa@cmp.felk.cvut.cz
80 * Calculates proper bit-timing parameters for a specified bit-rate
81 * and sample-point, which can then be used to set the bit-timing
82 * registers of the CAN controller. You can find more information
83 * in the header file linux/can/netlink.h.
85 static int can_update_spt(const struct can_bittiming_const
*btc
,
86 int sampl_pt
, int tseg
, int *tseg1
, int *tseg2
)
88 *tseg2
= tseg
+ 1 - (sampl_pt
* (tseg
+ 1)) / 1000;
89 if (*tseg2
< btc
->tseg2_min
)
90 *tseg2
= btc
->tseg2_min
;
91 if (*tseg2
> btc
->tseg2_max
)
92 *tseg2
= btc
->tseg2_max
;
93 *tseg1
= tseg
- *tseg2
;
94 if (*tseg1
> btc
->tseg1_max
) {
95 *tseg1
= btc
->tseg1_max
;
96 *tseg2
= tseg
- *tseg1
;
98 return 1000 * (tseg
+ 1 - *tseg2
) / (tseg
+ 1);
101 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
103 struct can_priv
*priv
= netdev_priv(dev
);
104 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
105 long rate
, best_rate
= 0;
106 long best_error
= 1000000000, error
= 0;
107 int best_tseg
= 0, best_brp
= 0, brp
= 0;
108 int tsegall
, tseg
= 0, tseg1
= 0, tseg2
= 0;
109 int spt_error
= 1000, spt
= 0, sampl_pt
;
112 if (!priv
->bittiming_const
)
115 /* Use CIA recommended sample points */
116 if (bt
->sample_point
) {
117 sampl_pt
= bt
->sample_point
;
119 if (bt
->bitrate
> 800000)
121 else if (bt
->bitrate
> 500000)
127 /* tseg even = round down, odd = round up */
128 for (tseg
= (btc
->tseg1_max
+ btc
->tseg2_max
) * 2 + 1;
129 tseg
>= (btc
->tseg1_min
+ btc
->tseg2_min
) * 2; tseg
--) {
130 tsegall
= 1 + tseg
/ 2;
131 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
132 brp
= priv
->clock
.freq
/ (tsegall
* bt
->bitrate
) + tseg
% 2;
133 /* chose brp step which is possible in system */
134 brp
= (brp
/ btc
->brp_inc
) * btc
->brp_inc
;
135 if ((brp
< btc
->brp_min
) || (brp
> btc
->brp_max
))
137 rate
= priv
->clock
.freq
/ (brp
* tsegall
);
138 error
= bt
->bitrate
- rate
;
139 /* tseg brp biterror */
142 if (error
> best_error
)
146 spt
= can_update_spt(btc
, sampl_pt
, tseg
/ 2,
148 error
= sampl_pt
- spt
;
151 if (error
> spt_error
)
155 best_tseg
= tseg
/ 2;
163 /* Error in one-tenth of a percent */
164 error
= (best_error
* 1000) / bt
->bitrate
;
165 if (error
> CAN_CALC_MAX_ERROR
) {
167 "bitrate error %ld.%ld%% too high\n",
168 error
/ 10, error
% 10);
171 netdev_warn(dev
, "bitrate error %ld.%ld%%\n",
172 error
/ 10, error
% 10);
176 /* real sample point */
177 bt
->sample_point
= can_update_spt(btc
, sampl_pt
, best_tseg
,
180 v64
= (u64
)best_brp
* 1000000000UL;
181 do_div(v64
, priv
->clock
.freq
);
183 bt
->prop_seg
= tseg1
/ 2;
184 bt
->phase_seg1
= tseg1
- bt
->prop_seg
;
185 bt
->phase_seg2
= tseg2
;
187 /* check for sjw user settings */
188 if (!bt
->sjw
|| !btc
->sjw_max
)
191 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
192 if (bt
->sjw
> btc
->sjw_max
)
193 bt
->sjw
= btc
->sjw_max
;
194 /* bt->sjw must not be higher than tseg2 */
201 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* (tseg1
+ tseg2
+ 1));
205 #else /* !CONFIG_CAN_CALC_BITTIMING */
206 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
208 netdev_err(dev
, "bit-timing calculation not available\n");
211 #endif /* CONFIG_CAN_CALC_BITTIMING */
214 * Checks the validity of the specified bit-timing parameters prop_seg,
215 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
216 * prescaler value brp. You can find more information in the header
217 * file linux/can/netlink.h.
219 static int can_fixup_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
221 struct can_priv
*priv
= netdev_priv(dev
);
222 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
226 if (!priv
->bittiming_const
)
229 tseg1
= bt
->prop_seg
+ bt
->phase_seg1
;
232 if (bt
->sjw
> btc
->sjw_max
||
233 tseg1
< btc
->tseg1_min
|| tseg1
> btc
->tseg1_max
||
234 bt
->phase_seg2
< btc
->tseg2_min
|| bt
->phase_seg2
> btc
->tseg2_max
)
237 brp64
= (u64
)priv
->clock
.freq
* (u64
)bt
->tq
;
238 if (btc
->brp_inc
> 1)
239 do_div(brp64
, btc
->brp_inc
);
240 brp64
+= 500000000UL - 1;
241 do_div(brp64
, 1000000000UL); /* the practicable BRP */
242 if (btc
->brp_inc
> 1)
243 brp64
*= btc
->brp_inc
;
244 bt
->brp
= (u32
)brp64
;
246 if (bt
->brp
< btc
->brp_min
|| bt
->brp
> btc
->brp_max
)
249 alltseg
= bt
->prop_seg
+ bt
->phase_seg1
+ bt
->phase_seg2
+ 1;
250 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* alltseg
);
251 bt
->sample_point
= ((tseg1
+ 1) * 1000) / alltseg
;
256 static int can_get_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
258 struct can_priv
*priv
= netdev_priv(dev
);
261 /* Check if the CAN device has bit-timing parameters */
262 if (priv
->bittiming_const
) {
264 /* Non-expert mode? Check if the bitrate has been pre-defined */
266 /* Determine bit-timing parameters */
267 err
= can_calc_bittiming(dev
, bt
);
269 /* Check bit-timing params and calculate proper brp */
270 err
= can_fixup_bittiming(dev
, bt
);
279 * Local echo of CAN messages
281 * CAN network devices *should* support a local echo functionality
282 * (see Documentation/networking/can.txt). To test the handling of CAN
283 * interfaces that do not support the local echo both driver types are
284 * implemented. In the case that the driver does not support the echo
285 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
286 * to perform the echo as a fallback solution.
288 static void can_flush_echo_skb(struct net_device
*dev
)
290 struct can_priv
*priv
= netdev_priv(dev
);
291 struct net_device_stats
*stats
= &dev
->stats
;
294 for (i
= 0; i
< priv
->echo_skb_max
; i
++) {
295 if (priv
->echo_skb
[i
]) {
296 kfree_skb(priv
->echo_skb
[i
]);
297 priv
->echo_skb
[i
] = NULL
;
299 stats
->tx_aborted_errors
++;
305 * Put the skb on the stack to be looped backed locally lateron
307 * The function is typically called in the start_xmit function
308 * of the device driver. The driver must protect access to
309 * priv->echo_skb, if necessary.
311 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
314 struct can_priv
*priv
= netdev_priv(dev
);
316 BUG_ON(idx
>= priv
->echo_skb_max
);
318 /* check flag whether this packet has to be looped back */
319 if (!(dev
->flags
& IFF_ECHO
) || skb
->pkt_type
!= PACKET_LOOPBACK
) {
324 if (!priv
->echo_skb
[idx
]) {
325 struct sock
*srcsk
= skb
->sk
;
327 if (atomic_read(&skb
->users
) != 1) {
328 struct sk_buff
*old_skb
= skb
;
330 skb
= skb_clone(old_skb
, GFP_ATOMIC
);
339 /* make settings for echo to reduce code in irq context */
340 skb
->protocol
= htons(ETH_P_CAN
);
341 skb
->pkt_type
= PACKET_BROADCAST
;
342 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
345 /* save this skb for tx interrupt echo handling */
346 priv
->echo_skb
[idx
] = skb
;
348 /* locking problem with netif_stop_queue() ?? */
349 netdev_err(dev
, "%s: BUG! echo_skb is occupied!\n", __func__
);
353 EXPORT_SYMBOL_GPL(can_put_echo_skb
);
356 * Get the skb from the stack and loop it back locally
358 * The function is typically called when the TX done interrupt
359 * is handled in the device driver. The driver must protect
360 * access to priv->echo_skb, if necessary.
362 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
)
364 struct can_priv
*priv
= netdev_priv(dev
);
366 BUG_ON(idx
>= priv
->echo_skb_max
);
368 if (priv
->echo_skb
[idx
]) {
369 struct sk_buff
*skb
= priv
->echo_skb
[idx
];
370 struct can_frame
*cf
= (struct can_frame
*)skb
->data
;
371 u8 dlc
= cf
->can_dlc
;
373 netif_rx(priv
->echo_skb
[idx
]);
374 priv
->echo_skb
[idx
] = NULL
;
381 EXPORT_SYMBOL_GPL(can_get_echo_skb
);
384 * Remove the skb from the stack and free it.
386 * The function is typically called when TX failed.
388 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
)
390 struct can_priv
*priv
= netdev_priv(dev
);
392 BUG_ON(idx
>= priv
->echo_skb_max
);
394 if (priv
->echo_skb
[idx
]) {
395 kfree_skb(priv
->echo_skb
[idx
]);
396 priv
->echo_skb
[idx
] = NULL
;
399 EXPORT_SYMBOL_GPL(can_free_echo_skb
);
402 * CAN device restart for bus-off recovery
404 static void can_restart(unsigned long data
)
406 struct net_device
*dev
= (struct net_device
*)data
;
407 struct can_priv
*priv
= netdev_priv(dev
);
408 struct net_device_stats
*stats
= &dev
->stats
;
410 struct can_frame
*cf
;
413 BUG_ON(netif_carrier_ok(dev
));
416 * No synchronization needed because the device is bus-off and
417 * no messages can come in or go out.
419 can_flush_echo_skb(dev
);
421 /* send restart message upstream */
422 skb
= alloc_can_err_skb(dev
, &cf
);
427 cf
->can_id
|= CAN_ERR_RESTARTED
;
432 stats
->rx_bytes
+= cf
->can_dlc
;
435 netdev_dbg(dev
, "restarted\n");
436 priv
->can_stats
.restarts
++;
438 /* Now restart the device */
439 err
= priv
->do_set_mode(dev
, CAN_MODE_START
);
441 netif_carrier_on(dev
);
443 netdev_err(dev
, "Error %d during restart", err
);
446 int can_restart_now(struct net_device
*dev
)
448 struct can_priv
*priv
= netdev_priv(dev
);
451 * A manual restart is only permitted if automatic restart is
452 * disabled and the device is in the bus-off state
454 if (priv
->restart_ms
)
456 if (priv
->state
!= CAN_STATE_BUS_OFF
)
459 /* Runs as soon as possible in the timer context */
460 mod_timer(&priv
->restart_timer
, jiffies
);
468 * This functions should be called when the device goes bus-off to
469 * tell the netif layer that no more packets can be sent or received.
470 * If enabled, a timer is started to trigger bus-off recovery.
472 void can_bus_off(struct net_device
*dev
)
474 struct can_priv
*priv
= netdev_priv(dev
);
476 netdev_dbg(dev
, "bus-off\n");
478 netif_carrier_off(dev
);
479 priv
->can_stats
.bus_off
++;
481 if (priv
->restart_ms
)
482 mod_timer(&priv
->restart_timer
,
483 jiffies
+ (priv
->restart_ms
* HZ
) / 1000);
485 EXPORT_SYMBOL_GPL(can_bus_off
);
487 static void can_setup(struct net_device
*dev
)
489 dev
->type
= ARPHRD_CAN
;
491 dev
->hard_header_len
= 0;
493 dev
->tx_queue_len
= 10;
495 /* New-style flags. */
496 dev
->flags
= IFF_NOARP
;
497 dev
->features
= NETIF_F_HW_CSUM
;
500 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
)
504 skb
= netdev_alloc_skb(dev
, sizeof(struct can_frame
));
508 skb
->protocol
= htons(ETH_P_CAN
);
509 skb
->pkt_type
= PACKET_BROADCAST
;
510 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
511 *cf
= (struct can_frame
*)skb_put(skb
, sizeof(struct can_frame
));
512 memset(*cf
, 0, sizeof(struct can_frame
));
516 EXPORT_SYMBOL_GPL(alloc_can_skb
);
518 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
, struct can_frame
**cf
)
522 skb
= alloc_can_skb(dev
, cf
);
526 (*cf
)->can_id
= CAN_ERR_FLAG
;
527 (*cf
)->can_dlc
= CAN_ERR_DLC
;
531 EXPORT_SYMBOL_GPL(alloc_can_err_skb
);
534 * Allocate and setup space for the CAN network device
536 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
)
538 struct net_device
*dev
;
539 struct can_priv
*priv
;
543 size
= ALIGN(sizeof_priv
, sizeof(struct sk_buff
*)) +
544 echo_skb_max
* sizeof(struct sk_buff
*);
548 dev
= alloc_netdev(size
, "can%d", can_setup
);
552 priv
= netdev_priv(dev
);
555 priv
->echo_skb_max
= echo_skb_max
;
556 priv
->echo_skb
= (void *)priv
+
557 ALIGN(sizeof_priv
, sizeof(struct sk_buff
*));
560 priv
->state
= CAN_STATE_STOPPED
;
562 init_timer(&priv
->restart_timer
);
566 EXPORT_SYMBOL_GPL(alloc_candev
);
569 * Free space of the CAN network device
571 void free_candev(struct net_device
*dev
)
575 EXPORT_SYMBOL_GPL(free_candev
);
578 * Common open function when the device gets opened.
580 * This function should be called in the open function of the device
583 int open_candev(struct net_device
*dev
)
585 struct can_priv
*priv
= netdev_priv(dev
);
587 if (!priv
->bittiming
.tq
&& !priv
->bittiming
.bitrate
) {
588 netdev_err(dev
, "bit-timing not yet defined\n");
592 /* Switch carrier on if device was stopped while in bus-off state */
593 if (!netif_carrier_ok(dev
))
594 netif_carrier_on(dev
);
596 setup_timer(&priv
->restart_timer
, can_restart
, (unsigned long)dev
);
600 EXPORT_SYMBOL_GPL(open_candev
);
603 * Common close function for cleanup before the device gets closed.
605 * This function should be called in the close function of the device
608 void close_candev(struct net_device
*dev
)
610 struct can_priv
*priv
= netdev_priv(dev
);
612 if (del_timer_sync(&priv
->restart_timer
))
614 can_flush_echo_skb(dev
);
616 EXPORT_SYMBOL_GPL(close_candev
);
619 * CAN netlink interface
621 static const struct nla_policy can_policy
[IFLA_CAN_MAX
+ 1] = {
622 [IFLA_CAN_STATE
] = { .type
= NLA_U32
},
623 [IFLA_CAN_CTRLMODE
] = { .len
= sizeof(struct can_ctrlmode
) },
624 [IFLA_CAN_RESTART_MS
] = { .type
= NLA_U32
},
625 [IFLA_CAN_RESTART
] = { .type
= NLA_U32
},
626 [IFLA_CAN_BITTIMING
] = { .len
= sizeof(struct can_bittiming
) },
627 [IFLA_CAN_BITTIMING_CONST
]
628 = { .len
= sizeof(struct can_bittiming_const
) },
629 [IFLA_CAN_CLOCK
] = { .len
= sizeof(struct can_clock
) },
630 [IFLA_CAN_BERR_COUNTER
] = { .len
= sizeof(struct can_berr_counter
) },
633 static int can_changelink(struct net_device
*dev
,
634 struct nlattr
*tb
[], struct nlattr
*data
[])
636 struct can_priv
*priv
= netdev_priv(dev
);
639 /* We need synchronization with dev->stop() */
642 if (data
[IFLA_CAN_CTRLMODE
]) {
643 struct can_ctrlmode
*cm
;
645 /* Do not allow changing controller mode while running */
646 if (dev
->flags
& IFF_UP
)
648 cm
= nla_data(data
[IFLA_CAN_CTRLMODE
]);
649 if (cm
->flags
& ~priv
->ctrlmode_supported
)
651 priv
->ctrlmode
&= ~cm
->mask
;
652 priv
->ctrlmode
|= cm
->flags
;
655 if (data
[IFLA_CAN_BITTIMING
]) {
656 struct can_bittiming bt
;
658 /* Do not allow changing bittiming while running */
659 if (dev
->flags
& IFF_UP
)
661 memcpy(&bt
, nla_data(data
[IFLA_CAN_BITTIMING
]), sizeof(bt
));
662 if ((!bt
.bitrate
&& !bt
.tq
) || (bt
.bitrate
&& bt
.tq
))
664 err
= can_get_bittiming(dev
, &bt
);
667 memcpy(&priv
->bittiming
, &bt
, sizeof(bt
));
669 if (priv
->do_set_bittiming
) {
670 /* Finally, set the bit-timing registers */
671 err
= priv
->do_set_bittiming(dev
);
677 if (data
[IFLA_CAN_RESTART_MS
]) {
678 /* Do not allow changing restart delay while running */
679 if (dev
->flags
& IFF_UP
)
681 priv
->restart_ms
= nla_get_u32(data
[IFLA_CAN_RESTART_MS
]);
684 if (data
[IFLA_CAN_RESTART
]) {
685 /* Do not allow a restart while not running */
686 if (!(dev
->flags
& IFF_UP
))
688 err
= can_restart_now(dev
);
696 static size_t can_get_size(const struct net_device
*dev
)
698 struct can_priv
*priv
= netdev_priv(dev
);
701 size
= nla_total_size(sizeof(u32
)); /* IFLA_CAN_STATE */
702 size
+= sizeof(struct can_ctrlmode
); /* IFLA_CAN_CTRLMODE */
703 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_RESTART_MS */
704 size
+= sizeof(struct can_bittiming
); /* IFLA_CAN_BITTIMING */
705 size
+= sizeof(struct can_clock
); /* IFLA_CAN_CLOCK */
706 if (priv
->do_get_berr_counter
) /* IFLA_CAN_BERR_COUNTER */
707 size
+= sizeof(struct can_berr_counter
);
708 if (priv
->bittiming_const
) /* IFLA_CAN_BITTIMING_CONST */
709 size
+= sizeof(struct can_bittiming_const
);
714 static int can_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
716 struct can_priv
*priv
= netdev_priv(dev
);
717 struct can_ctrlmode cm
= {.flags
= priv
->ctrlmode
};
718 struct can_berr_counter bec
;
719 enum can_state state
= priv
->state
;
721 if (priv
->do_get_state
)
722 priv
->do_get_state(dev
, &state
);
723 if (nla_put_u32(skb
, IFLA_CAN_STATE
, state
) ||
724 nla_put(skb
, IFLA_CAN_CTRLMODE
, sizeof(cm
), &cm
) ||
725 nla_put_u32(skb
, IFLA_CAN_RESTART_MS
, priv
->restart_ms
) ||
726 nla_put(skb
, IFLA_CAN_BITTIMING
,
727 sizeof(priv
->bittiming
), &priv
->bittiming
) ||
728 nla_put(skb
, IFLA_CAN_CLOCK
, sizeof(cm
), &priv
->clock
) ||
729 (priv
->do_get_berr_counter
&&
730 !priv
->do_get_berr_counter(dev
, &bec
) &&
731 nla_put(skb
, IFLA_CAN_BERR_COUNTER
, sizeof(bec
), &bec
)) ||
732 (priv
->bittiming_const
&&
733 nla_put(skb
, IFLA_CAN_BITTIMING_CONST
,
734 sizeof(*priv
->bittiming_const
), priv
->bittiming_const
)))
735 goto nla_put_failure
;
742 static size_t can_get_xstats_size(const struct net_device
*dev
)
744 return sizeof(struct can_device_stats
);
747 static int can_fill_xstats(struct sk_buff
*skb
, const struct net_device
*dev
)
749 struct can_priv
*priv
= netdev_priv(dev
);
751 if (nla_put(skb
, IFLA_INFO_XSTATS
,
752 sizeof(priv
->can_stats
), &priv
->can_stats
))
753 goto nla_put_failure
;
760 static int can_newlink(struct net
*src_net
, struct net_device
*dev
,
761 struct nlattr
*tb
[], struct nlattr
*data
[])
766 static struct rtnl_link_ops can_link_ops __read_mostly
= {
768 .maxtype
= IFLA_CAN_MAX
,
769 .policy
= can_policy
,
771 .newlink
= can_newlink
,
772 .changelink
= can_changelink
,
773 .get_size
= can_get_size
,
774 .fill_info
= can_fill_info
,
775 .get_xstats_size
= can_get_xstats_size
,
776 .fill_xstats
= can_fill_xstats
,
780 * Register the CAN network device
782 int register_candev(struct net_device
*dev
)
784 dev
->rtnl_link_ops
= &can_link_ops
;
785 return register_netdev(dev
);
787 EXPORT_SYMBOL_GPL(register_candev
);
790 * Unregister the CAN network device
792 void unregister_candev(struct net_device
*dev
)
794 unregister_netdev(dev
);
796 EXPORT_SYMBOL_GPL(unregister_candev
);
798 static __init
int can_dev_init(void)
802 err
= rtnl_link_register(&can_link_ops
);
804 printk(KERN_INFO MOD_DESC
"\n");
808 module_init(can_dev_init
);
810 static __exit
void can_dev_exit(void)
812 rtnl_link_unregister(&can_link_ops
);
814 module_exit(can_dev_exit
);
816 MODULE_ALIAS_RTNL_LINK("can");