[net-next v3 09/15] can: length: canfd_sanitize_len(): add function to sanitize CAN-FD data length - Marc Kleine-Budde

From: Marc Kleine-Budde <mkl@pengutronix.de>
To: linux-can@vger.kernel.org
Cc: Oliver Hartkopp <socketcan@hartkopp.net>,
	Vincent Mailhol <mailhol.vincent@wanadoo.fr>,
	Marc Kleine-Budde <mkl@pengutronix.de>
Subject: [net-next v3 09/15] can: length: canfd_sanitize_len(): add function to sanitize CAN-FD data length
Date: Mon, 11 Jan 2021 15:19:24 +0100	[thread overview]
Message-ID: <20210111141930.693847-10-mkl@pengutronix.de> (raw)
In-Reply-To: <20210111141930.693847-1-mkl@pengutronix.de>

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.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
---
 include/linux/can/length.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/can/length.h b/include/linux/can/length.h
index 156b9d17969a..b2313b2a0b02 100644
--- a/include/linux/can/length.h
+++ b/include/linux/can/length.h
@@ -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 */
-- 
2.29.2


