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can: skb: add skb CAN frame data length helpers

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Add two helpers to retrieve the data length from CAN sk_buffs and prepare
the length information to be a uint16 value for the CAN XL support.

Acked-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20220912170725.120748-3-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp 2022-09-12 19:07:20 +02:00 • committed by Marc Kleine-Budde
parent 96a7457a14
commit 467ef4c7b9
3 changed files with 28 additions and 10 deletions
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24
include/linux/can/skb.h
View file

@ -20,7 +20,8 @@ void can_flush_echo_skb(struct net_device *dev);
int can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
unsigned int idx, unsigned int frame_len);
struct sk_buff *__can_get_echo_skb(struct net_device *dev, unsigned int idx,
u8 *len_ptr, unsigned int *frame_len_ptr);
unsigned int *len_ptr,
unsigned int *frame_len_ptr);
unsigned int __must_check can_get_echo_skb(struct net_device *dev,
unsigned int idx,
unsigned int *frame_len_ptr);
@ -113,4 +114,25 @@ static inline bool can_is_canfd_skb(const struct sk_buff *skb)
return (skb->len == CANFD_MTU && cfd->len <= CANFD_MAX_DLEN);
}
/* get length element value from can[fd]_frame structure */
static inline unsigned int can_skb_get_len_val(struct sk_buff *skb)
{
const struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
return cfd->len;
}
/* get needed data length inside CAN frame for all frame types (RTR aware) */
static inline unsigned int can_skb_get_data_len(struct sk_buff *skb)
{
unsigned int len = can_skb_get_len_val(skb);
const struct can_frame *cf = (struct can_frame *)skb->data;
/* RTR frames have an actual length of zero */
if (can_is_can_skb(skb) && cf->can_id & CAN_RTR_FLAG)
return 0;
return len;
}
#endif /* !_CAN_SKB_H */