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can: length: canfd_sanitize_len(): add function to sanitize CAN-FD data length

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The data field in CAN-FD frames have specifig frame length (0, 1, 2, 3, 4, 5,
6, 7, 8, 12, 16, 20, 24, 32, 48, 64). This function "rounds" up a given length
to the next valid CAN-FD frame length.

Reviewed-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/r/20210111141930.693847-10-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2021-01-11 15:19:24 +01:00
parent 652562e5ff
commit 99b7beb043
1 changed files with 6 additions and 0 deletions
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6
include/linux/can/length.h
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@ -45,4 +45,10 @@ u8 can_fd_dlc2len(u8 dlc);
/* map the sanitized data length to an appropriate data length code */
u8 can_fd_len2dlc(u8 len);
/* map the data length to an appropriate data link layer length */
static inline u8 canfd_sanitize_len(u8 len)
{
return can_fd_dlc2len(can_fd_len2dlc(len));
}
#endif /* !_CAN_LENGTH_H */