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Enable CAN_RAW sockets to read and write CAN XL frames analogue to the CAN FD extension (new CAN_RAW_XL_FRAMES sockopt). A CAN XL network interface is capable to handle Classical CAN, CAN FD and CAN XL frames. When CAN_RAW_XL_FRAMES is enabled, the CAN_RAW socket checks whether the addressed CAN network interface is capable to handle the provided CAN frame. In opposite to the fixed number of bytes for - CAN frames (CAN_MTU = sizeof(struct can_frame)) - CAN FD frames (CANFD_MTU = sizeof(struct can_frame)) the number of bytes when reading/writing CAN XL frames depends on the number of data bytes. For efficiency reasons the length of the struct canxl_frame is truncated to the needed size for read/write operations. This leads to a calculated size of CANXL_HDR_SIZE + canxl_frame::len which is enforced on write() operations and guaranteed on read() operations. NB: Valid length values are 1 .. 2048 (CANXL_MIN_DLEN .. CANXL_MAX_DLEN). Acked-by: Vincent Mailhol <[email protected]> Signed-off-by: Oliver Hartkopp <[email protected]> Link: https://lore.kernel.org/all/[email protected] Signed-off-by: Marc Kleine-Budde <[email protected]>
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