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
,
103 const struct can_bittiming_const
*btc
)
105 struct can_priv
*priv
= netdev_priv(dev
);
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 /* Use CIA recommended sample points */
114 if (bt
->sample_point
) {
115 sampl_pt
= bt
->sample_point
;
117 if (bt
->bitrate
> 800000)
119 else if (bt
->bitrate
> 500000)
125 /* tseg even = round down, odd = round up */
126 for (tseg
= (btc
->tseg1_max
+ btc
->tseg2_max
) * 2 + 1;
127 tseg
>= (btc
->tseg1_min
+ btc
->tseg2_min
) * 2; tseg
--) {
128 tsegall
= 1 + tseg
/ 2;
129 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
130 brp
= priv
->clock
.freq
/ (tsegall
* bt
->bitrate
) + tseg
% 2;
131 /* chose brp step which is possible in system */
132 brp
= (brp
/ btc
->brp_inc
) * btc
->brp_inc
;
133 if ((brp
< btc
->brp_min
) || (brp
> btc
->brp_max
))
135 rate
= priv
->clock
.freq
/ (brp
* tsegall
);
136 error
= bt
->bitrate
- rate
;
137 /* tseg brp biterror */
140 if (error
> best_error
)
144 spt
= can_update_spt(btc
, sampl_pt
, tseg
/ 2,
146 error
= sampl_pt
- spt
;
149 if (error
> spt_error
)
153 best_tseg
= tseg
/ 2;
161 /* Error in one-tenth of a percent */
162 error
= (best_error
* 1000) / bt
->bitrate
;
163 if (error
> CAN_CALC_MAX_ERROR
) {
165 "bitrate error %ld.%ld%% too high\n",
166 error
/ 10, error
% 10);
169 netdev_warn(dev
, "bitrate error %ld.%ld%%\n",
170 error
/ 10, error
% 10);
174 /* real sample point */
175 bt
->sample_point
= can_update_spt(btc
, sampl_pt
, best_tseg
,
178 v64
= (u64
)best_brp
* 1000000000UL;
179 do_div(v64
, priv
->clock
.freq
);
181 bt
->prop_seg
= tseg1
/ 2;
182 bt
->phase_seg1
= tseg1
- bt
->prop_seg
;
183 bt
->phase_seg2
= tseg2
;
185 /* check for sjw user settings */
186 if (!bt
->sjw
|| !btc
->sjw_max
)
189 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
190 if (bt
->sjw
> btc
->sjw_max
)
191 bt
->sjw
= btc
->sjw_max
;
192 /* bt->sjw must not be higher than tseg2 */
199 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* (tseg1
+ tseg2
+ 1));
203 #else /* !CONFIG_CAN_CALC_BITTIMING */
204 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
205 const struct can_bittiming_const
*btc
)
207 netdev_err(dev
, "bit-timing calculation not available\n");
210 #endif /* CONFIG_CAN_CALC_BITTIMING */
213 * Checks the validity of the specified bit-timing parameters prop_seg,
214 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
215 * prescaler value brp. You can find more information in the header
216 * file linux/can/netlink.h.
218 static int can_fixup_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
219 const struct can_bittiming_const
*btc
)
221 struct can_priv
*priv
= netdev_priv(dev
);
225 tseg1
= bt
->prop_seg
+ bt
->phase_seg1
;
228 if (bt
->sjw
> btc
->sjw_max
||
229 tseg1
< btc
->tseg1_min
|| tseg1
> btc
->tseg1_max
||
230 bt
->phase_seg2
< btc
->tseg2_min
|| bt
->phase_seg2
> btc
->tseg2_max
)
233 brp64
= (u64
)priv
->clock
.freq
* (u64
)bt
->tq
;
234 if (btc
->brp_inc
> 1)
235 do_div(brp64
, btc
->brp_inc
);
236 brp64
+= 500000000UL - 1;
237 do_div(brp64
, 1000000000UL); /* the practicable BRP */
238 if (btc
->brp_inc
> 1)
239 brp64
*= btc
->brp_inc
;
240 bt
->brp
= (u32
)brp64
;
242 if (bt
->brp
< btc
->brp_min
|| bt
->brp
> btc
->brp_max
)
245 alltseg
= bt
->prop_seg
+ bt
->phase_seg1
+ bt
->phase_seg2
+ 1;
246 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* alltseg
);
247 bt
->sample_point
= ((tseg1
+ 1) * 1000) / alltseg
;
252 static int can_get_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
253 const struct can_bittiming_const
*btc
)
257 /* Check if the CAN device has bit-timing parameters */
262 * Depending on the given can_bittiming parameter structure the CAN
263 * timing parameters are calculated based on the provided bitrate OR
264 * alternatively the CAN timing parameters (tq, prop_seg, etc.) are
265 * provided directly which are then checked and fixed up.
267 if (!bt
->tq
&& bt
->bitrate
)
268 err
= can_calc_bittiming(dev
, bt
, btc
);
269 else if (bt
->tq
&& !bt
->bitrate
)
270 err
= can_fixup_bittiming(dev
, bt
, btc
);
278 * Local echo of CAN messages
280 * CAN network devices *should* support a local echo functionality
281 * (see Documentation/networking/can.txt). To test the handling of CAN
282 * interfaces that do not support the local echo both driver types are
283 * implemented. In the case that the driver does not support the echo
284 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
285 * to perform the echo as a fallback solution.
287 static void can_flush_echo_skb(struct net_device
*dev
)
289 struct can_priv
*priv
= netdev_priv(dev
);
290 struct net_device_stats
*stats
= &dev
->stats
;
293 for (i
= 0; i
< priv
->echo_skb_max
; i
++) {
294 if (priv
->echo_skb
[i
]) {
295 kfree_skb(priv
->echo_skb
[i
]);
296 priv
->echo_skb
[i
] = NULL
;
298 stats
->tx_aborted_errors
++;
304 * Put the skb on the stack to be looped backed locally lateron
306 * The function is typically called in the start_xmit function
307 * of the device driver. The driver must protect access to
308 * priv->echo_skb, if necessary.
310 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
313 struct can_priv
*priv
= netdev_priv(dev
);
315 BUG_ON(idx
>= priv
->echo_skb_max
);
317 /* check flag whether this packet has to be looped back */
318 if (!(dev
->flags
& IFF_ECHO
) || skb
->pkt_type
!= PACKET_LOOPBACK
||
319 (skb
->protocol
!= htons(ETH_P_CAN
) &&
320 skb
->protocol
!= htons(ETH_P_CANFD
))) {
325 if (!priv
->echo_skb
[idx
]) {
327 skb
= can_create_echo_skb(skb
);
331 /* make settings for echo to reduce code in irq context */
332 skb
->pkt_type
= PACKET_BROADCAST
;
333 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
336 /* save this skb for tx interrupt echo handling */
337 priv
->echo_skb
[idx
] = skb
;
339 /* locking problem with netif_stop_queue() ?? */
340 netdev_err(dev
, "%s: BUG! echo_skb is occupied!\n", __func__
);
344 EXPORT_SYMBOL_GPL(can_put_echo_skb
);
347 * Get the skb from the stack and loop it back locally
349 * The function is typically called when the TX done interrupt
350 * is handled in the device driver. The driver must protect
351 * access to priv->echo_skb, if necessary.
353 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
)
355 struct can_priv
*priv
= netdev_priv(dev
);
357 BUG_ON(idx
>= priv
->echo_skb_max
);
359 if (priv
->echo_skb
[idx
]) {
360 struct sk_buff
*skb
= priv
->echo_skb
[idx
];
361 struct can_frame
*cf
= (struct can_frame
*)skb
->data
;
362 u8 dlc
= cf
->can_dlc
;
364 netif_rx(priv
->echo_skb
[idx
]);
365 priv
->echo_skb
[idx
] = NULL
;
372 EXPORT_SYMBOL_GPL(can_get_echo_skb
);
375 * Remove the skb from the stack and free it.
377 * The function is typically called when TX failed.
379 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
)
381 struct can_priv
*priv
= netdev_priv(dev
);
383 BUG_ON(idx
>= priv
->echo_skb_max
);
385 if (priv
->echo_skb
[idx
]) {
386 kfree_skb(priv
->echo_skb
[idx
]);
387 priv
->echo_skb
[idx
] = NULL
;
390 EXPORT_SYMBOL_GPL(can_free_echo_skb
);
393 * CAN device restart for bus-off recovery
395 static void can_restart(unsigned long data
)
397 struct net_device
*dev
= (struct net_device
*)data
;
398 struct can_priv
*priv
= netdev_priv(dev
);
399 struct net_device_stats
*stats
= &dev
->stats
;
401 struct can_frame
*cf
;
404 BUG_ON(netif_carrier_ok(dev
));
407 * No synchronization needed because the device is bus-off and
408 * no messages can come in or go out.
410 can_flush_echo_skb(dev
);
412 /* send restart message upstream */
413 skb
= alloc_can_err_skb(dev
, &cf
);
418 cf
->can_id
|= CAN_ERR_RESTARTED
;
423 stats
->rx_bytes
+= cf
->can_dlc
;
426 netdev_dbg(dev
, "restarted\n");
427 priv
->can_stats
.restarts
++;
429 /* Now restart the device */
430 err
= priv
->do_set_mode(dev
, CAN_MODE_START
);
432 netif_carrier_on(dev
);
434 netdev_err(dev
, "Error %d during restart", err
);
437 int can_restart_now(struct net_device
*dev
)
439 struct can_priv
*priv
= netdev_priv(dev
);
442 * A manual restart is only permitted if automatic restart is
443 * disabled and the device is in the bus-off state
445 if (priv
->restart_ms
)
447 if (priv
->state
!= CAN_STATE_BUS_OFF
)
450 /* Runs as soon as possible in the timer context */
451 mod_timer(&priv
->restart_timer
, jiffies
);
459 * This functions should be called when the device goes bus-off to
460 * tell the netif layer that no more packets can be sent or received.
461 * If enabled, a timer is started to trigger bus-off recovery.
463 void can_bus_off(struct net_device
*dev
)
465 struct can_priv
*priv
= netdev_priv(dev
);
467 netdev_dbg(dev
, "bus-off\n");
469 netif_carrier_off(dev
);
470 priv
->can_stats
.bus_off
++;
472 if (priv
->restart_ms
)
473 mod_timer(&priv
->restart_timer
,
474 jiffies
+ (priv
->restart_ms
* HZ
) / 1000);
476 EXPORT_SYMBOL_GPL(can_bus_off
);
478 static void can_setup(struct net_device
*dev
)
480 dev
->type
= ARPHRD_CAN
;
482 dev
->hard_header_len
= 0;
484 dev
->tx_queue_len
= 10;
486 /* New-style flags. */
487 dev
->flags
= IFF_NOARP
;
488 dev
->features
= NETIF_F_HW_CSUM
;
491 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
)
495 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
496 sizeof(struct can_frame
));
500 skb
->protocol
= htons(ETH_P_CAN
);
501 skb
->pkt_type
= PACKET_BROADCAST
;
502 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
504 can_skb_reserve(skb
);
505 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
507 *cf
= (struct can_frame
*)skb_put(skb
, sizeof(struct can_frame
));
508 memset(*cf
, 0, sizeof(struct can_frame
));
512 EXPORT_SYMBOL_GPL(alloc_can_skb
);
514 struct sk_buff
*alloc_canfd_skb(struct net_device
*dev
,
515 struct canfd_frame
**cfd
)
519 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
520 sizeof(struct canfd_frame
));
524 skb
->protocol
= htons(ETH_P_CANFD
);
525 skb
->pkt_type
= PACKET_BROADCAST
;
526 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
528 can_skb_reserve(skb
);
529 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
531 *cfd
= (struct canfd_frame
*)skb_put(skb
, sizeof(struct canfd_frame
));
532 memset(*cfd
, 0, sizeof(struct canfd_frame
));
536 EXPORT_SYMBOL_GPL(alloc_canfd_skb
);
538 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
, struct can_frame
**cf
)
542 skb
= alloc_can_skb(dev
, cf
);
546 (*cf
)->can_id
= CAN_ERR_FLAG
;
547 (*cf
)->can_dlc
= CAN_ERR_DLC
;
551 EXPORT_SYMBOL_GPL(alloc_can_err_skb
);
554 * Allocate and setup space for the CAN network device
556 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
)
558 struct net_device
*dev
;
559 struct can_priv
*priv
;
563 size
= ALIGN(sizeof_priv
, sizeof(struct sk_buff
*)) +
564 echo_skb_max
* sizeof(struct sk_buff
*);
568 dev
= alloc_netdev(size
, "can%d", NET_NAME_UNKNOWN
, can_setup
);
572 priv
= netdev_priv(dev
);
575 priv
->echo_skb_max
= echo_skb_max
;
576 priv
->echo_skb
= (void *)priv
+
577 ALIGN(sizeof_priv
, sizeof(struct sk_buff
*));
580 priv
->state
= CAN_STATE_STOPPED
;
582 init_timer(&priv
->restart_timer
);
586 EXPORT_SYMBOL_GPL(alloc_candev
);
589 * Free space of the CAN network device
591 void free_candev(struct net_device
*dev
)
595 EXPORT_SYMBOL_GPL(free_candev
);
598 * changing MTU and control mode for CAN/CANFD devices
600 int can_change_mtu(struct net_device
*dev
, int new_mtu
)
602 struct can_priv
*priv
= netdev_priv(dev
);
604 /* Do not allow changing the MTU while running */
605 if (dev
->flags
& IFF_UP
)
608 /* allow change of MTU according to the CANFD ability of the device */
611 priv
->ctrlmode
&= ~CAN_CTRLMODE_FD
;
615 if (!(priv
->ctrlmode_supported
& CAN_CTRLMODE_FD
))
618 priv
->ctrlmode
|= CAN_CTRLMODE_FD
;
628 EXPORT_SYMBOL_GPL(can_change_mtu
);
631 * Common open function when the device gets opened.
633 * This function should be called in the open function of the device
636 int open_candev(struct net_device
*dev
)
638 struct can_priv
*priv
= netdev_priv(dev
);
640 if (!priv
->bittiming
.bitrate
) {
641 netdev_err(dev
, "bit-timing not yet defined\n");
645 /* For CAN FD the data bitrate has to be >= the arbitration bitrate */
646 if ((priv
->ctrlmode
& CAN_CTRLMODE_FD
) &&
647 (!priv
->data_bittiming
.bitrate
||
648 (priv
->data_bittiming
.bitrate
< priv
->bittiming
.bitrate
))) {
649 netdev_err(dev
, "incorrect/missing data bit-timing\n");
653 /* Switch carrier on if device was stopped while in bus-off state */
654 if (!netif_carrier_ok(dev
))
655 netif_carrier_on(dev
);
657 setup_timer(&priv
->restart_timer
, can_restart
, (unsigned long)dev
);
661 EXPORT_SYMBOL_GPL(open_candev
);
664 * Common close function for cleanup before the device gets closed.
666 * This function should be called in the close function of the device
669 void close_candev(struct net_device
*dev
)
671 struct can_priv
*priv
= netdev_priv(dev
);
673 del_timer_sync(&priv
->restart_timer
);
674 can_flush_echo_skb(dev
);
676 EXPORT_SYMBOL_GPL(close_candev
);
679 * CAN netlink interface
681 static const struct nla_policy can_policy
[IFLA_CAN_MAX
+ 1] = {
682 [IFLA_CAN_STATE
] = { .type
= NLA_U32
},
683 [IFLA_CAN_CTRLMODE
] = { .len
= sizeof(struct can_ctrlmode
) },
684 [IFLA_CAN_RESTART_MS
] = { .type
= NLA_U32
},
685 [IFLA_CAN_RESTART
] = { .type
= NLA_U32
},
686 [IFLA_CAN_BITTIMING
] = { .len
= sizeof(struct can_bittiming
) },
687 [IFLA_CAN_BITTIMING_CONST
]
688 = { .len
= sizeof(struct can_bittiming_const
) },
689 [IFLA_CAN_CLOCK
] = { .len
= sizeof(struct can_clock
) },
690 [IFLA_CAN_BERR_COUNTER
] = { .len
= sizeof(struct can_berr_counter
) },
691 [IFLA_CAN_DATA_BITTIMING
]
692 = { .len
= sizeof(struct can_bittiming
) },
693 [IFLA_CAN_DATA_BITTIMING_CONST
]
694 = { .len
= sizeof(struct can_bittiming_const
) },
697 static int can_changelink(struct net_device
*dev
,
698 struct nlattr
*tb
[], struct nlattr
*data
[])
700 struct can_priv
*priv
= netdev_priv(dev
);
703 /* We need synchronization with dev->stop() */
706 if (data
[IFLA_CAN_BITTIMING
]) {
707 struct can_bittiming bt
;
709 /* Do not allow changing bittiming while running */
710 if (dev
->flags
& IFF_UP
)
712 memcpy(&bt
, nla_data(data
[IFLA_CAN_BITTIMING
]), sizeof(bt
));
713 err
= can_get_bittiming(dev
, &bt
, priv
->bittiming_const
);
716 memcpy(&priv
->bittiming
, &bt
, sizeof(bt
));
718 if (priv
->do_set_bittiming
) {
719 /* Finally, set the bit-timing registers */
720 err
= priv
->do_set_bittiming(dev
);
726 if (data
[IFLA_CAN_CTRLMODE
]) {
727 struct can_ctrlmode
*cm
;
729 /* Do not allow changing controller mode while running */
730 if (dev
->flags
& IFF_UP
)
732 cm
= nla_data(data
[IFLA_CAN_CTRLMODE
]);
733 if (cm
->flags
& ~priv
->ctrlmode_supported
)
735 priv
->ctrlmode
&= ~cm
->mask
;
736 priv
->ctrlmode
|= cm
->flags
;
738 /* CAN_CTRLMODE_FD can only be set when driver supports FD */
739 if (priv
->ctrlmode
& CAN_CTRLMODE_FD
)
740 dev
->mtu
= CANFD_MTU
;
745 if (data
[IFLA_CAN_RESTART_MS
]) {
746 /* Do not allow changing restart delay while running */
747 if (dev
->flags
& IFF_UP
)
749 priv
->restart_ms
= nla_get_u32(data
[IFLA_CAN_RESTART_MS
]);
752 if (data
[IFLA_CAN_RESTART
]) {
753 /* Do not allow a restart while not running */
754 if (!(dev
->flags
& IFF_UP
))
756 err
= can_restart_now(dev
);
761 if (data
[IFLA_CAN_DATA_BITTIMING
]) {
762 struct can_bittiming dbt
;
764 /* Do not allow changing bittiming while running */
765 if (dev
->flags
& IFF_UP
)
767 memcpy(&dbt
, nla_data(data
[IFLA_CAN_DATA_BITTIMING
]),
769 err
= can_get_bittiming(dev
, &dbt
, priv
->data_bittiming_const
);
772 memcpy(&priv
->data_bittiming
, &dbt
, sizeof(dbt
));
774 if (priv
->do_set_data_bittiming
) {
775 /* Finally, set the bit-timing registers */
776 err
= priv
->do_set_data_bittiming(dev
);
785 static size_t can_get_size(const struct net_device
*dev
)
787 struct can_priv
*priv
= netdev_priv(dev
);
790 if (priv
->bittiming
.bitrate
) /* IFLA_CAN_BITTIMING */
791 size
+= nla_total_size(sizeof(struct can_bittiming
));
792 if (priv
->bittiming_const
) /* IFLA_CAN_BITTIMING_CONST */
793 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
794 size
+= nla_total_size(sizeof(struct can_clock
)); /* IFLA_CAN_CLOCK */
795 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_STATE */
796 size
+= nla_total_size(sizeof(struct can_ctrlmode
)); /* IFLA_CAN_CTRLMODE */
797 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_RESTART_MS */
798 if (priv
->do_get_berr_counter
) /* IFLA_CAN_BERR_COUNTER */
799 size
+= nla_total_size(sizeof(struct can_berr_counter
));
800 if (priv
->data_bittiming
.bitrate
) /* IFLA_CAN_DATA_BITTIMING */
801 size
+= nla_total_size(sizeof(struct can_bittiming
));
802 if (priv
->data_bittiming_const
) /* IFLA_CAN_DATA_BITTIMING_CONST */
803 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
808 static int can_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
810 struct can_priv
*priv
= netdev_priv(dev
);
811 struct can_ctrlmode cm
= {.flags
= priv
->ctrlmode
};
812 struct can_berr_counter bec
;
813 enum can_state state
= priv
->state
;
815 if (priv
->do_get_state
)
816 priv
->do_get_state(dev
, &state
);
818 if ((priv
->bittiming
.bitrate
&&
819 nla_put(skb
, IFLA_CAN_BITTIMING
,
820 sizeof(priv
->bittiming
), &priv
->bittiming
)) ||
822 (priv
->bittiming_const
&&
823 nla_put(skb
, IFLA_CAN_BITTIMING_CONST
,
824 sizeof(*priv
->bittiming_const
), priv
->bittiming_const
)) ||
826 nla_put(skb
, IFLA_CAN_CLOCK
, sizeof(cm
), &priv
->clock
) ||
827 nla_put_u32(skb
, IFLA_CAN_STATE
, state
) ||
828 nla_put(skb
, IFLA_CAN_CTRLMODE
, sizeof(cm
), &cm
) ||
829 nla_put_u32(skb
, IFLA_CAN_RESTART_MS
, priv
->restart_ms
) ||
831 (priv
->do_get_berr_counter
&&
832 !priv
->do_get_berr_counter(dev
, &bec
) &&
833 nla_put(skb
, IFLA_CAN_BERR_COUNTER
, sizeof(bec
), &bec
)) ||
835 (priv
->data_bittiming
.bitrate
&&
836 nla_put(skb
, IFLA_CAN_DATA_BITTIMING
,
837 sizeof(priv
->data_bittiming
), &priv
->data_bittiming
)) ||
839 (priv
->data_bittiming_const
&&
840 nla_put(skb
, IFLA_CAN_DATA_BITTIMING_CONST
,
841 sizeof(*priv
->data_bittiming_const
),
842 priv
->data_bittiming_const
)))
848 static size_t can_get_xstats_size(const struct net_device
*dev
)
850 return sizeof(struct can_device_stats
);
853 static int can_fill_xstats(struct sk_buff
*skb
, const struct net_device
*dev
)
855 struct can_priv
*priv
= netdev_priv(dev
);
857 if (nla_put(skb
, IFLA_INFO_XSTATS
,
858 sizeof(priv
->can_stats
), &priv
->can_stats
))
859 goto nla_put_failure
;
866 static int can_newlink(struct net
*src_net
, struct net_device
*dev
,
867 struct nlattr
*tb
[], struct nlattr
*data
[])
872 static struct rtnl_link_ops can_link_ops __read_mostly
= {
874 .maxtype
= IFLA_CAN_MAX
,
875 .policy
= can_policy
,
877 .newlink
= can_newlink
,
878 .changelink
= can_changelink
,
879 .get_size
= can_get_size
,
880 .fill_info
= can_fill_info
,
881 .get_xstats_size
= can_get_xstats_size
,
882 .fill_xstats
= can_fill_xstats
,
886 * Register the CAN network device
888 int register_candev(struct net_device
*dev
)
890 dev
->rtnl_link_ops
= &can_link_ops
;
891 return register_netdev(dev
);
893 EXPORT_SYMBOL_GPL(register_candev
);
896 * Unregister the CAN network device
898 void unregister_candev(struct net_device
*dev
)
900 unregister_netdev(dev
);
902 EXPORT_SYMBOL_GPL(unregister_candev
);
905 * Test if a network device is a candev based device
906 * and return the can_priv* if so.
908 struct can_priv
*safe_candev_priv(struct net_device
*dev
)
910 if ((dev
->type
!= ARPHRD_CAN
) || (dev
->rtnl_link_ops
!= &can_link_ops
))
913 return netdev_priv(dev
);
915 EXPORT_SYMBOL_GPL(safe_candev_priv
);
917 static __init
int can_dev_init(void)
921 can_led_notifier_init();
923 err
= rtnl_link_register(&can_link_ops
);
925 printk(KERN_INFO MOD_DESC
"\n");
929 module_init(can_dev_init
);
931 static __exit
void can_dev_exit(void)
933 rtnl_link_unregister(&can_link_ops
);
935 can_led_notifier_exit();
937 module_exit(can_dev_exit
);
939 MODULE_ALIAS_RTNL_LINK("can");