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 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
;
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;
160 /* Error in one-tenth of a percent */
161 error
= (best_error
* 1000) / bt
->bitrate
;
162 if (error
> CAN_CALC_MAX_ERROR
) {
164 "bitrate error %ld.%ld%% too high\n",
165 error
/ 10, error
% 10);
168 netdev_warn(dev
, "bitrate error %ld.%ld%%\n",
169 error
/ 10, error
% 10);
173 /* real sample point */
174 bt
->sample_point
= can_update_spt(btc
, sampl_pt
, best_tseg
,
177 v64
= (u64
)best_brp
* 1000000000UL;
178 do_div(v64
, priv
->clock
.freq
);
180 bt
->prop_seg
= tseg1
/ 2;
181 bt
->phase_seg1
= tseg1
- bt
->prop_seg
;
182 bt
->phase_seg2
= tseg2
;
184 /* check for sjw user settings */
185 if (!bt
->sjw
|| !btc
->sjw_max
)
188 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
189 if (bt
->sjw
> btc
->sjw_max
)
190 bt
->sjw
= btc
->sjw_max
;
191 /* bt->sjw must not be higher than tseg2 */
198 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* (tseg1
+ tseg2
+ 1));
202 #else /* !CONFIG_CAN_CALC_BITTIMING */
203 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
204 const struct can_bittiming_const
*btc
)
206 netdev_err(dev
, "bit-timing calculation not available\n");
209 #endif /* CONFIG_CAN_CALC_BITTIMING */
212 * Checks the validity of the specified bit-timing parameters prop_seg,
213 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
214 * prescaler value brp. You can find more information in the header
215 * file linux/can/netlink.h.
217 static int can_fixup_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
218 const struct can_bittiming_const
*btc
)
220 struct can_priv
*priv
= netdev_priv(dev
);
224 tseg1
= bt
->prop_seg
+ bt
->phase_seg1
;
227 if (bt
->sjw
> btc
->sjw_max
||
228 tseg1
< btc
->tseg1_min
|| tseg1
> btc
->tseg1_max
||
229 bt
->phase_seg2
< btc
->tseg2_min
|| bt
->phase_seg2
> btc
->tseg2_max
)
232 brp64
= (u64
)priv
->clock
.freq
* (u64
)bt
->tq
;
233 if (btc
->brp_inc
> 1)
234 do_div(brp64
, btc
->brp_inc
);
235 brp64
+= 500000000UL - 1;
236 do_div(brp64
, 1000000000UL); /* the practicable BRP */
237 if (btc
->brp_inc
> 1)
238 brp64
*= btc
->brp_inc
;
239 bt
->brp
= (u32
)brp64
;
241 if (bt
->brp
< btc
->brp_min
|| bt
->brp
> btc
->brp_max
)
244 alltseg
= bt
->prop_seg
+ bt
->phase_seg1
+ bt
->phase_seg2
+ 1;
245 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* alltseg
);
246 bt
->sample_point
= ((tseg1
+ 1) * 1000) / alltseg
;
251 static int can_get_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
,
252 const struct can_bittiming_const
*btc
)
256 /* Check if the CAN device has bit-timing parameters */
261 * Depending on the given can_bittiming parameter structure the CAN
262 * timing parameters are calculated based on the provided bitrate OR
263 * alternatively the CAN timing parameters (tq, prop_seg, etc.) are
264 * provided directly which are then checked and fixed up.
266 if (!bt
->tq
&& bt
->bitrate
)
267 err
= can_calc_bittiming(dev
, bt
, btc
);
268 else if (bt
->tq
&& !bt
->bitrate
)
269 err
= can_fixup_bittiming(dev
, bt
, btc
);
276 static void can_update_state_error_stats(struct net_device
*dev
,
277 enum can_state new_state
)
279 struct can_priv
*priv
= netdev_priv(dev
);
281 if (new_state
<= priv
->state
)
285 case CAN_STATE_ERROR_WARNING
:
286 priv
->can_stats
.error_warning
++;
288 case CAN_STATE_ERROR_PASSIVE
:
289 priv
->can_stats
.error_passive
++;
291 case CAN_STATE_BUS_OFF
:
292 priv
->can_stats
.bus_off
++;
299 static int can_tx_state_to_frame(struct net_device
*dev
, enum can_state state
)
302 case CAN_STATE_ERROR_ACTIVE
:
303 return CAN_ERR_CRTL_ACTIVE
;
304 case CAN_STATE_ERROR_WARNING
:
305 return CAN_ERR_CRTL_TX_WARNING
;
306 case CAN_STATE_ERROR_PASSIVE
:
307 return CAN_ERR_CRTL_TX_PASSIVE
;
313 static int can_rx_state_to_frame(struct net_device
*dev
, enum can_state state
)
316 case CAN_STATE_ERROR_ACTIVE
:
317 return CAN_ERR_CRTL_ACTIVE
;
318 case CAN_STATE_ERROR_WARNING
:
319 return CAN_ERR_CRTL_RX_WARNING
;
320 case CAN_STATE_ERROR_PASSIVE
:
321 return CAN_ERR_CRTL_RX_PASSIVE
;
327 void can_change_state(struct net_device
*dev
, struct can_frame
*cf
,
328 enum can_state tx_state
, enum can_state rx_state
)
330 struct can_priv
*priv
= netdev_priv(dev
);
331 enum can_state new_state
= max(tx_state
, rx_state
);
333 if (unlikely(new_state
== priv
->state
)) {
334 netdev_warn(dev
, "%s: oops, state did not change", __func__
);
338 netdev_dbg(dev
, "New error state: %d\n", new_state
);
340 can_update_state_error_stats(dev
, new_state
);
341 priv
->state
= new_state
;
343 if (unlikely(new_state
== CAN_STATE_BUS_OFF
)) {
344 cf
->can_id
|= CAN_ERR_BUSOFF
;
348 cf
->can_id
|= CAN_ERR_CRTL
;
349 cf
->data
[1] |= tx_state
>= rx_state
?
350 can_tx_state_to_frame(dev
, tx_state
) : 0;
351 cf
->data
[1] |= tx_state
<= rx_state
?
352 can_rx_state_to_frame(dev
, rx_state
) : 0;
354 EXPORT_SYMBOL_GPL(can_change_state
);
357 * Local echo of CAN messages
359 * CAN network devices *should* support a local echo functionality
360 * (see Documentation/networking/can.txt). To test the handling of CAN
361 * interfaces that do not support the local echo both driver types are
362 * implemented. In the case that the driver does not support the echo
363 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
364 * to perform the echo as a fallback solution.
366 static void can_flush_echo_skb(struct net_device
*dev
)
368 struct can_priv
*priv
= netdev_priv(dev
);
369 struct net_device_stats
*stats
= &dev
->stats
;
372 for (i
= 0; i
< priv
->echo_skb_max
; i
++) {
373 if (priv
->echo_skb
[i
]) {
374 kfree_skb(priv
->echo_skb
[i
]);
375 priv
->echo_skb
[i
] = NULL
;
377 stats
->tx_aborted_errors
++;
383 * Put the skb on the stack to be looped backed locally lateron
385 * The function is typically called in the start_xmit function
386 * of the device driver. The driver must protect access to
387 * priv->echo_skb, if necessary.
389 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
392 struct can_priv
*priv
= netdev_priv(dev
);
394 BUG_ON(idx
>= priv
->echo_skb_max
);
396 /* check flag whether this packet has to be looped back */
397 if (!(dev
->flags
& IFF_ECHO
) || skb
->pkt_type
!= PACKET_LOOPBACK
||
398 (skb
->protocol
!= htons(ETH_P_CAN
) &&
399 skb
->protocol
!= htons(ETH_P_CANFD
))) {
404 if (!priv
->echo_skb
[idx
]) {
406 skb
= can_create_echo_skb(skb
);
410 /* make settings for echo to reduce code in irq context */
411 skb
->pkt_type
= PACKET_BROADCAST
;
412 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
415 /* save this skb for tx interrupt echo handling */
416 priv
->echo_skb
[idx
] = skb
;
418 /* locking problem with netif_stop_queue() ?? */
419 netdev_err(dev
, "%s: BUG! echo_skb is occupied!\n", __func__
);
423 EXPORT_SYMBOL_GPL(can_put_echo_skb
);
426 * Get the skb from the stack and loop it back locally
428 * The function is typically called when the TX done interrupt
429 * is handled in the device driver. The driver must protect
430 * access to priv->echo_skb, if necessary.
432 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
)
434 struct can_priv
*priv
= netdev_priv(dev
);
436 BUG_ON(idx
>= priv
->echo_skb_max
);
438 if (priv
->echo_skb
[idx
]) {
439 struct sk_buff
*skb
= priv
->echo_skb
[idx
];
440 struct can_frame
*cf
= (struct can_frame
*)skb
->data
;
441 u8 dlc
= cf
->can_dlc
;
443 if (!(skb
->tstamp
.tv64
))
444 __net_timestamp(skb
);
446 netif_rx(priv
->echo_skb
[idx
]);
447 priv
->echo_skb
[idx
] = NULL
;
454 EXPORT_SYMBOL_GPL(can_get_echo_skb
);
457 * Remove the skb from the stack and free it.
459 * The function is typically called when TX failed.
461 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
)
463 struct can_priv
*priv
= netdev_priv(dev
);
465 BUG_ON(idx
>= priv
->echo_skb_max
);
467 if (priv
->echo_skb
[idx
]) {
468 dev_kfree_skb_any(priv
->echo_skb
[idx
]);
469 priv
->echo_skb
[idx
] = NULL
;
472 EXPORT_SYMBOL_GPL(can_free_echo_skb
);
475 * CAN device restart for bus-off recovery
477 static void can_restart(unsigned long data
)
479 struct net_device
*dev
= (struct net_device
*)data
;
480 struct can_priv
*priv
= netdev_priv(dev
);
481 struct net_device_stats
*stats
= &dev
->stats
;
483 struct can_frame
*cf
;
486 BUG_ON(netif_carrier_ok(dev
));
489 * No synchronization needed because the device is bus-off and
490 * no messages can come in or go out.
492 can_flush_echo_skb(dev
);
494 /* send restart message upstream */
495 skb
= alloc_can_err_skb(dev
, &cf
);
500 cf
->can_id
|= CAN_ERR_RESTARTED
;
505 stats
->rx_bytes
+= cf
->can_dlc
;
508 netdev_dbg(dev
, "restarted\n");
509 priv
->can_stats
.restarts
++;
511 /* Now restart the device */
512 err
= priv
->do_set_mode(dev
, CAN_MODE_START
);
514 netif_carrier_on(dev
);
516 netdev_err(dev
, "Error %d during restart", err
);
519 int can_restart_now(struct net_device
*dev
)
521 struct can_priv
*priv
= netdev_priv(dev
);
524 * A manual restart is only permitted if automatic restart is
525 * disabled and the device is in the bus-off state
527 if (priv
->restart_ms
)
529 if (priv
->state
!= CAN_STATE_BUS_OFF
)
532 /* Runs as soon as possible in the timer context */
533 mod_timer(&priv
->restart_timer
, jiffies
);
541 * This functions should be called when the device goes bus-off to
542 * tell the netif layer that no more packets can be sent or received.
543 * If enabled, a timer is started to trigger bus-off recovery.
545 void can_bus_off(struct net_device
*dev
)
547 struct can_priv
*priv
= netdev_priv(dev
);
549 netdev_dbg(dev
, "bus-off\n");
551 netif_carrier_off(dev
);
553 if (priv
->restart_ms
)
554 mod_timer(&priv
->restart_timer
,
555 jiffies
+ (priv
->restart_ms
* HZ
) / 1000);
557 EXPORT_SYMBOL_GPL(can_bus_off
);
559 static void can_setup(struct net_device
*dev
)
561 dev
->type
= ARPHRD_CAN
;
563 dev
->hard_header_len
= 0;
565 dev
->tx_queue_len
= 10;
567 /* New-style flags. */
568 dev
->flags
= IFF_NOARP
;
569 dev
->features
= NETIF_F_HW_CSUM
;
572 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
)
576 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
577 sizeof(struct can_frame
));
581 __net_timestamp(skb
);
582 skb
->protocol
= htons(ETH_P_CAN
);
583 skb
->pkt_type
= PACKET_BROADCAST
;
584 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
586 skb_reset_mac_header(skb
);
587 skb_reset_network_header(skb
);
588 skb_reset_transport_header(skb
);
590 can_skb_reserve(skb
);
591 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
593 *cf
= (struct can_frame
*)skb_put(skb
, sizeof(struct can_frame
));
594 memset(*cf
, 0, sizeof(struct can_frame
));
598 EXPORT_SYMBOL_GPL(alloc_can_skb
);
600 struct sk_buff
*alloc_canfd_skb(struct net_device
*dev
,
601 struct canfd_frame
**cfd
)
605 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
606 sizeof(struct canfd_frame
));
610 __net_timestamp(skb
);
611 skb
->protocol
= htons(ETH_P_CANFD
);
612 skb
->pkt_type
= PACKET_BROADCAST
;
613 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
615 skb_reset_mac_header(skb
);
616 skb_reset_network_header(skb
);
617 skb_reset_transport_header(skb
);
619 can_skb_reserve(skb
);
620 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
622 *cfd
= (struct canfd_frame
*)skb_put(skb
, sizeof(struct canfd_frame
));
623 memset(*cfd
, 0, sizeof(struct canfd_frame
));
627 EXPORT_SYMBOL_GPL(alloc_canfd_skb
);
629 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
, struct can_frame
**cf
)
633 skb
= alloc_can_skb(dev
, cf
);
637 (*cf
)->can_id
= CAN_ERR_FLAG
;
638 (*cf
)->can_dlc
= CAN_ERR_DLC
;
642 EXPORT_SYMBOL_GPL(alloc_can_err_skb
);
645 * Allocate and setup space for the CAN network device
647 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
)
649 struct net_device
*dev
;
650 struct can_priv
*priv
;
654 size
= ALIGN(sizeof_priv
, sizeof(struct sk_buff
*)) +
655 echo_skb_max
* sizeof(struct sk_buff
*);
659 dev
= alloc_netdev(size
, "can%d", NET_NAME_UNKNOWN
, can_setup
);
663 priv
= netdev_priv(dev
);
666 priv
->echo_skb_max
= echo_skb_max
;
667 priv
->echo_skb
= (void *)priv
+
668 ALIGN(sizeof_priv
, sizeof(struct sk_buff
*));
671 priv
->state
= CAN_STATE_STOPPED
;
673 init_timer(&priv
->restart_timer
);
677 EXPORT_SYMBOL_GPL(alloc_candev
);
680 * Free space of the CAN network device
682 void free_candev(struct net_device
*dev
)
686 EXPORT_SYMBOL_GPL(free_candev
);
689 * changing MTU and control mode for CAN/CANFD devices
691 int can_change_mtu(struct net_device
*dev
, int new_mtu
)
693 struct can_priv
*priv
= netdev_priv(dev
);
695 /* Do not allow changing the MTU while running */
696 if (dev
->flags
& IFF_UP
)
699 /* allow change of MTU according to the CANFD ability of the device */
702 priv
->ctrlmode
&= ~CAN_CTRLMODE_FD
;
706 if (!(priv
->ctrlmode_supported
& CAN_CTRLMODE_FD
))
709 priv
->ctrlmode
|= CAN_CTRLMODE_FD
;
719 EXPORT_SYMBOL_GPL(can_change_mtu
);
722 * Common open function when the device gets opened.
724 * This function should be called in the open function of the device
727 int open_candev(struct net_device
*dev
)
729 struct can_priv
*priv
= netdev_priv(dev
);
731 if (!priv
->bittiming
.bitrate
) {
732 netdev_err(dev
, "bit-timing not yet defined\n");
736 /* For CAN FD the data bitrate has to be >= the arbitration bitrate */
737 if ((priv
->ctrlmode
& CAN_CTRLMODE_FD
) &&
738 (!priv
->data_bittiming
.bitrate
||
739 (priv
->data_bittiming
.bitrate
< priv
->bittiming
.bitrate
))) {
740 netdev_err(dev
, "incorrect/missing data bit-timing\n");
744 /* Switch carrier on if device was stopped while in bus-off state */
745 if (!netif_carrier_ok(dev
))
746 netif_carrier_on(dev
);
748 setup_timer(&priv
->restart_timer
, can_restart
, (unsigned long)dev
);
752 EXPORT_SYMBOL_GPL(open_candev
);
755 * Common close function for cleanup before the device gets closed.
757 * This function should be called in the close function of the device
760 void close_candev(struct net_device
*dev
)
762 struct can_priv
*priv
= netdev_priv(dev
);
764 del_timer_sync(&priv
->restart_timer
);
765 can_flush_echo_skb(dev
);
767 EXPORT_SYMBOL_GPL(close_candev
);
770 * CAN netlink interface
772 static const struct nla_policy can_policy
[IFLA_CAN_MAX
+ 1] = {
773 [IFLA_CAN_STATE
] = { .type
= NLA_U32
},
774 [IFLA_CAN_CTRLMODE
] = { .len
= sizeof(struct can_ctrlmode
) },
775 [IFLA_CAN_RESTART_MS
] = { .type
= NLA_U32
},
776 [IFLA_CAN_RESTART
] = { .type
= NLA_U32
},
777 [IFLA_CAN_BITTIMING
] = { .len
= sizeof(struct can_bittiming
) },
778 [IFLA_CAN_BITTIMING_CONST
]
779 = { .len
= sizeof(struct can_bittiming_const
) },
780 [IFLA_CAN_CLOCK
] = { .len
= sizeof(struct can_clock
) },
781 [IFLA_CAN_BERR_COUNTER
] = { .len
= sizeof(struct can_berr_counter
) },
782 [IFLA_CAN_DATA_BITTIMING
]
783 = { .len
= sizeof(struct can_bittiming
) },
784 [IFLA_CAN_DATA_BITTIMING_CONST
]
785 = { .len
= sizeof(struct can_bittiming_const
) },
788 static int can_changelink(struct net_device
*dev
,
789 struct nlattr
*tb
[], struct nlattr
*data
[])
791 struct can_priv
*priv
= netdev_priv(dev
);
794 /* We need synchronization with dev->stop() */
797 if (data
[IFLA_CAN_BITTIMING
]) {
798 struct can_bittiming bt
;
800 /* Do not allow changing bittiming while running */
801 if (dev
->flags
& IFF_UP
)
803 memcpy(&bt
, nla_data(data
[IFLA_CAN_BITTIMING
]), sizeof(bt
));
804 err
= can_get_bittiming(dev
, &bt
, priv
->bittiming_const
);
807 memcpy(&priv
->bittiming
, &bt
, sizeof(bt
));
809 if (priv
->do_set_bittiming
) {
810 /* Finally, set the bit-timing registers */
811 err
= priv
->do_set_bittiming(dev
);
817 if (data
[IFLA_CAN_CTRLMODE
]) {
818 struct can_ctrlmode
*cm
;
820 /* Do not allow changing controller mode while running */
821 if (dev
->flags
& IFF_UP
)
823 cm
= nla_data(data
[IFLA_CAN_CTRLMODE
]);
825 /* check whether changed bits are allowed to be modified */
826 if (cm
->mask
& ~priv
->ctrlmode_supported
)
829 /* clear bits to be modified and copy the flag values */
830 priv
->ctrlmode
&= ~cm
->mask
;
831 priv
->ctrlmode
|= (cm
->flags
& cm
->mask
);
833 /* CAN_CTRLMODE_FD can only be set when driver supports FD */
834 if (priv
->ctrlmode
& CAN_CTRLMODE_FD
)
835 dev
->mtu
= CANFD_MTU
;
840 if (data
[IFLA_CAN_RESTART_MS
]) {
841 /* Do not allow changing restart delay while running */
842 if (dev
->flags
& IFF_UP
)
844 priv
->restart_ms
= nla_get_u32(data
[IFLA_CAN_RESTART_MS
]);
847 if (data
[IFLA_CAN_RESTART
]) {
848 /* Do not allow a restart while not running */
849 if (!(dev
->flags
& IFF_UP
))
851 err
= can_restart_now(dev
);
856 if (data
[IFLA_CAN_DATA_BITTIMING
]) {
857 struct can_bittiming dbt
;
859 /* Do not allow changing bittiming while running */
860 if (dev
->flags
& IFF_UP
)
862 memcpy(&dbt
, nla_data(data
[IFLA_CAN_DATA_BITTIMING
]),
864 err
= can_get_bittiming(dev
, &dbt
, priv
->data_bittiming_const
);
867 memcpy(&priv
->data_bittiming
, &dbt
, sizeof(dbt
));
869 if (priv
->do_set_data_bittiming
) {
870 /* Finally, set the bit-timing registers */
871 err
= priv
->do_set_data_bittiming(dev
);
880 static size_t can_get_size(const struct net_device
*dev
)
882 struct can_priv
*priv
= netdev_priv(dev
);
885 if (priv
->bittiming
.bitrate
) /* IFLA_CAN_BITTIMING */
886 size
+= nla_total_size(sizeof(struct can_bittiming
));
887 if (priv
->bittiming_const
) /* IFLA_CAN_BITTIMING_CONST */
888 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
889 size
+= nla_total_size(sizeof(struct can_clock
)); /* IFLA_CAN_CLOCK */
890 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_STATE */
891 size
+= nla_total_size(sizeof(struct can_ctrlmode
)); /* IFLA_CAN_CTRLMODE */
892 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_RESTART_MS */
893 if (priv
->do_get_berr_counter
) /* IFLA_CAN_BERR_COUNTER */
894 size
+= nla_total_size(sizeof(struct can_berr_counter
));
895 if (priv
->data_bittiming
.bitrate
) /* IFLA_CAN_DATA_BITTIMING */
896 size
+= nla_total_size(sizeof(struct can_bittiming
));
897 if (priv
->data_bittiming_const
) /* IFLA_CAN_DATA_BITTIMING_CONST */
898 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
903 static int can_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
905 struct can_priv
*priv
= netdev_priv(dev
);
906 struct can_ctrlmode cm
= {.flags
= priv
->ctrlmode
};
907 struct can_berr_counter bec
;
908 enum can_state state
= priv
->state
;
910 if (priv
->do_get_state
)
911 priv
->do_get_state(dev
, &state
);
913 if ((priv
->bittiming
.bitrate
&&
914 nla_put(skb
, IFLA_CAN_BITTIMING
,
915 sizeof(priv
->bittiming
), &priv
->bittiming
)) ||
917 (priv
->bittiming_const
&&
918 nla_put(skb
, IFLA_CAN_BITTIMING_CONST
,
919 sizeof(*priv
->bittiming_const
), priv
->bittiming_const
)) ||
921 nla_put(skb
, IFLA_CAN_CLOCK
, sizeof(cm
), &priv
->clock
) ||
922 nla_put_u32(skb
, IFLA_CAN_STATE
, state
) ||
923 nla_put(skb
, IFLA_CAN_CTRLMODE
, sizeof(cm
), &cm
) ||
924 nla_put_u32(skb
, IFLA_CAN_RESTART_MS
, priv
->restart_ms
) ||
926 (priv
->do_get_berr_counter
&&
927 !priv
->do_get_berr_counter(dev
, &bec
) &&
928 nla_put(skb
, IFLA_CAN_BERR_COUNTER
, sizeof(bec
), &bec
)) ||
930 (priv
->data_bittiming
.bitrate
&&
931 nla_put(skb
, IFLA_CAN_DATA_BITTIMING
,
932 sizeof(priv
->data_bittiming
), &priv
->data_bittiming
)) ||
934 (priv
->data_bittiming_const
&&
935 nla_put(skb
, IFLA_CAN_DATA_BITTIMING_CONST
,
936 sizeof(*priv
->data_bittiming_const
),
937 priv
->data_bittiming_const
)))
943 static size_t can_get_xstats_size(const struct net_device
*dev
)
945 return sizeof(struct can_device_stats
);
948 static int can_fill_xstats(struct sk_buff
*skb
, const struct net_device
*dev
)
950 struct can_priv
*priv
= netdev_priv(dev
);
952 if (nla_put(skb
, IFLA_INFO_XSTATS
,
953 sizeof(priv
->can_stats
), &priv
->can_stats
))
954 goto nla_put_failure
;
961 static int can_newlink(struct net
*src_net
, struct net_device
*dev
,
962 struct nlattr
*tb
[], struct nlattr
*data
[])
967 static struct rtnl_link_ops can_link_ops __read_mostly
= {
969 .maxtype
= IFLA_CAN_MAX
,
970 .policy
= can_policy
,
972 .newlink
= can_newlink
,
973 .changelink
= can_changelink
,
974 .get_size
= can_get_size
,
975 .fill_info
= can_fill_info
,
976 .get_xstats_size
= can_get_xstats_size
,
977 .fill_xstats
= can_fill_xstats
,
981 * Register the CAN network device
983 int register_candev(struct net_device
*dev
)
985 dev
->rtnl_link_ops
= &can_link_ops
;
986 return register_netdev(dev
);
988 EXPORT_SYMBOL_GPL(register_candev
);
991 * Unregister the CAN network device
993 void unregister_candev(struct net_device
*dev
)
995 unregister_netdev(dev
);
997 EXPORT_SYMBOL_GPL(unregister_candev
);
1000 * Test if a network device is a candev based device
1001 * and return the can_priv* if so.
1003 struct can_priv
*safe_candev_priv(struct net_device
*dev
)
1005 if ((dev
->type
!= ARPHRD_CAN
) || (dev
->rtnl_link_ops
!= &can_link_ops
))
1008 return netdev_priv(dev
);
1010 EXPORT_SYMBOL_GPL(safe_candev_priv
);
1012 static __init
int can_dev_init(void)
1016 can_led_notifier_init();
1018 err
= rtnl_link_register(&can_link_ops
);
1020 printk(KERN_INFO MOD_DESC
"\n");
1024 module_init(can_dev_init
);
1026 static __exit
void can_dev_exit(void)
1028 rtnl_link_unregister(&can_link_ops
);
1030 can_led_notifier_exit();
1032 module_exit(can_dev_exit
);
1034 MODULE_ALIAS_RTNL_LINK("can");