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>
30 * CAN common private data
33 struct can_device_stats can_stats;
35 struct can_bittiming bittiming;
36 const struct can_bittiming_const *bittiming_const;
37 struct can_clock clock;
41 u32 ctrlmode_supported;
44 struct timer_list restart_timer;
46 int (*do_set_bittiming)(struct net_device *dev);
47 int (*do_set_mode)(struct net_device *dev, enum can_mode mode);
48 int (*do_get_state)(const struct net_device *dev,
49 enum can_state *state);
50 int (*do_get_berr_counter)(const struct net_device *dev,
51 struct can_berr_counter *bec);
53 unsigned int echo_skb_max;
54 struct sk_buff **echo_skb;
58 * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
59 * to __u8 and ensure the dlc value to be max. 8 bytes.
61 * To be used in the CAN netdriver receive path to ensure conformance with
62 * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
64 #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC))
65 #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC))
67 /* Drop a given socketbuffer if it does not contain a valid CAN frame. */
68 static inline int can_dropped_invalid_skb(struct net_device *dev,
71 const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
73 if (skb->protocol == htons(ETH_P_CAN)) {
74 if (unlikely(skb->len != CAN_MTU ||
75 cfd->len > CAN_MAX_DLEN))
77 } else if (skb->protocol == htons(ETH_P_CANFD)) {
78 if (unlikely(skb->len != CANFD_MTU ||
79 cfd->len > CANFD_MAX_DLEN))
88 dev->stats.tx_dropped++;
92 /* get data length from can_dlc with sanitized can_dlc */
93 u8 can_dlc2len(u8 can_dlc);
95 /* map the sanitized data length to an appropriate data length code */
96 u8 can_len2dlc(u8 len);
98 struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
99 void free_candev(struct net_device *dev);
101 int open_candev(struct net_device *dev);
102 void close_candev(struct net_device *dev);
104 int register_candev(struct net_device *dev);
105 void unregister_candev(struct net_device *dev);
107 int can_restart_now(struct net_device *dev);
108 void can_bus_off(struct net_device *dev);
110 void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
112 unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx);
113 void can_free_echo_skb(struct net_device *dev, unsigned int idx);
115 struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf);
116 struct sk_buff *alloc_can_err_skb(struct net_device *dev,
117 struct can_frame **cf);
119 #endif /* CAN_DEV_H */