can: dev: add can_is_canfd_skb() API

The CAN device drivers can use can_is_canfd_skb() to check if the frame to send
is on CAN FD mode or normal CAN mode.

Acked-by: Oliver Hartkopp <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 6992afc6ba7f96fda9dba202f771fe7e28f807fe..b37ea95bc348f15b16a9c0d095588379b12edbee 100644 (file)
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -99,6 +99,12 @@ inval_skb:
        return 1;
 }
 
+static inline bool can_is_canfd_skb(const struct sk_buff *skb)
+{
+       /* the CAN specific type of skb is identified by its data length */
+       return skb->len == CANFD_MTU;
+}
+
 /* get data length from can_dlc with sanitized can_dlc */
 u8 can_dlc2len(u8 can_dlc);