Commit e1b2c7e9 authored by Oliver Hartkopp's avatar Oliver Hartkopp Committed by Marc Kleine-Budde
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can: canxl: support Remote Request Substitution bit access 



The Remote Request Substitution bit is a dominant bit ("0") in the CAN
XL frame. As some CAN XL controllers support to access this bit a new
CANXL_RRS value has been defined for the canxl_frame.flags element.

Signed-off-by: default avatarOliver Hartkopp <socketcan@hartkopp.net>
Link: https://patch.msgid.link/20250124142347.7444-1-socketcan@hartkopp.net


Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 6b89d89f

include/uapi/linux/can.h

+2 −1
Original line number Diff line number Diff line
@@ -182,7 +182,7 @@ struct canfd_frame { 
/*

 * defined bits for canxl_frame.flags

 *

 * The canxl_frame.flags element contains two bits CANXL_XLF and CANXL_SEC

 * The canxl_frame.flags element contains three bits CANXL_[XLF|SEC|RRS]

 * and shares the relative position of the struct can[fd]_frame.len element.

 * The CANXL_XLF bit ALWAYS needs to be set to indicate a valid CAN XL frame.

 * As a side effect setting this bit intentionally breaks the length checks
@@ -192,6 +192,7 @@ struct canfd_frame { 
 */

#define CANXL_XLF 0x80 /* mandatory CAN XL frame flag (must always be set!) */

#define CANXL_SEC 0x01 /* Simple Extended Content (security/segmentation) */

#define CANXL_RRS 0x02 /* Remote Request Substitution */



/* the 8-bit VCID is optionally placed in the canxl_frame.prio element */

#define CANXL_VCID_OFFSET 16 /* bit offset of VCID in prio element */