4 * Definitions for the CAN network device driver interface
6 * Copyright (C) 2006 Andrey Volkov <avolkov@varma-el.com>
9 * Copyright (C) 2008 Wolfgang Grandegger <wg@grandegger.com>
16 #include <linux/can.h>
17 #include <linux/can/netlink.h>
18 #include <linux/can/error.h>
19 #include <linux/can/led.h>
31 * CAN common private data
34 struct can_device_stats can_stats
;
36 struct can_bittiming bittiming
;
37 const struct can_bittiming_const
*bittiming_const
;
38 struct can_clock clock
;
42 u32 ctrlmode_supported
;
45 struct timer_list restart_timer
;
47 int (*do_set_bittiming
)(struct net_device
*dev
);
48 int (*do_set_mode
)(struct net_device
*dev
, enum can_mode mode
);
49 int (*do_get_state
)(const struct net_device
*dev
,
50 enum can_state
*state
);
51 int (*do_get_berr_counter
)(const struct net_device
*dev
,
52 struct can_berr_counter
*bec
);
54 unsigned int echo_skb_max
;
55 struct sk_buff
**echo_skb
;
57 #ifdef CONFIG_CAN_LEDS
58 struct led_trigger
*tx_led_trig
;
59 char tx_led_trig_name
[CAN_LED_NAME_SZ
];
60 struct led_trigger
*rx_led_trig
;
61 char rx_led_trig_name
[CAN_LED_NAME_SZ
];
66 * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
67 * to __u8 and ensure the dlc value to be max. 8 bytes.
69 * To be used in the CAN netdriver receive path to ensure conformance with
70 * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
72 #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
73 #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
75 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */
76 static inline int can_dropped_invalid_skb(struct net_device
*dev
,
79 const struct canfd_frame
*cfd
= (struct canfd_frame
*)skb
->data
;
81 if (skb
->protocol
== htons(ETH_P_CAN
)) {
82 if (unlikely(skb
->len
!= CAN_MTU
||
83 cfd
->len
> CAN_MAX_DLEN
))
85 } else if (skb
->protocol
== htons(ETH_P_CANFD
)) {
86 if (unlikely(skb
->len
!= CANFD_MTU
||
87 cfd
->len
> CANFD_MAX_DLEN
))
96 dev
->stats
.tx_dropped
++;
100 /* get data length from can_dlc with sanitized can_dlc */
101 u8
can_dlc2len(u8 can_dlc
);
103 /* map the sanitized data length to an appropriate data length code */
104 u8
can_len2dlc(u8 len
);
106 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
);
107 void free_candev(struct net_device
*dev
);
109 /* a candev safe wrapper around netdev_priv */
110 struct can_priv
*safe_candev_priv(struct net_device
*dev
);
112 int open_candev(struct net_device
*dev
);
113 void close_candev(struct net_device
*dev
);
115 int register_candev(struct net_device
*dev
);
116 void unregister_candev(struct net_device
*dev
);
118 int can_restart_now(struct net_device
*dev
);
119 void can_bus_off(struct net_device
*dev
);
121 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
123 unsigned int can_get_echo_skb(struct net_device
*dev
, unsigned int idx
);
124 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
);
126 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
);
127 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
,
128 struct can_frame
**cf
);
130 #endif /* CAN_DEV_H */