/* * linux/can/dev.h * * Definitions for the CAN network device driver interface * * Copyright (C) 2006 Andrey Volkov * Varma Electronics Oy * * Copyright (C) 2008 Wolfgang Grandegger * */ #ifndef CAN_DEV_H #define CAN_DEV_H #include #include #include #include /* * CAN mode */ enum can_mode { CAN_MODE_STOP = 0, CAN_MODE_START, CAN_MODE_SLEEP }; /* * CAN common private data */ struct can_priv { struct net_device *dev; struct can_device_stats can_stats; struct can_bittiming bittiming; const struct can_bittiming_const *bittiming_const; struct can_clock clock; enum can_state state; u32 ctrlmode; u32 ctrlmode_supported; int restart_ms; struct delayed_work restart_work; int (*do_set_bittiming)(struct net_device *dev); int (*do_set_mode)(struct net_device *dev, enum can_mode mode); int (*do_get_state)(const struct net_device *dev, enum can_state *state); int (*do_get_berr_counter)(const struct net_device *dev, struct can_berr_counter *bec); unsigned int echo_skb_max; struct sk_buff **echo_skb; #ifdef CONFIG_CAN_LEDS struct led_trigger *tx_led_trig; char tx_led_trig_name[CAN_LED_NAME_SZ]; struct led_trigger *rx_led_trig; char rx_led_trig_name[CAN_LED_NAME_SZ]; #endif }; /* * get_can_dlc(value) - helper macro to cast a given data length code (dlc) * to __u8 and ensure the dlc value to be max. 8 bytes. * * To be used in the CAN netdriver receive path to ensure conformance with * ISO 11898-1 Chapter 8.4.2.3 (DLC field) */ #define get_can_dlc(i) (min_t(__u8, (i), CAN_MAX_DLC)) #define get_canfd_dlc(i) (min_t(__u8, (i), CANFD_MAX_DLC)) /* Drop a given socketbuffer if it does not contain a valid CAN frame. */ static inline int can_dropped_invalid_skb(struct net_device *dev, struct sk_buff *skb) { const struct canfd_frame *cfd = (struct canfd_frame *)skb->data; if (skb->protocol == htons(ETH_P_CAN)) { if (unlikely(skb->len != CAN_MTU || cfd->len > CAN_MAX_DLEN)) goto inval_skb; } else if (skb->protocol == htons(ETH_P_CANFD)) { if (unlikely(skb->len != CANFD_MTU || cfd->len > CANFD_MAX_DLEN)) goto inval_skb; } else goto inval_skb; return 0; inval_skb: kfree_skb(skb); dev->stats.tx_dropped++; return 1; } /* get data length from can_dlc with sanitized can_dlc */ u8 can_dlc2len(u8 can_dlc); /* map the sanitized data length to an appropriate data length code */ u8 can_len2dlc(u8 len); struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max); void free_candev(struct net_device *dev); /* a candev safe wrapper around netdev_priv */ struct can_priv *safe_candev_priv(struct net_device *dev); int open_candev(struct net_device *dev); void close_candev(struct net_device *dev); int register_candev(struct net_device *dev); void unregister_candev(struct net_device *dev); int can_restart_now(struct net_device *dev); void can_bus_off(struct net_device *dev); void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev, unsigned int idx); unsigned int can_get_echo_skb(struct net_device *dev, unsigned int idx); void can_free_echo_skb(struct net_device *dev, unsigned int idx); struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf); struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf); #endif /* CAN_DEV_H */