can: netlink: Add CAN_CTRLMODE_PRESUME_ACK flag

Most CAN controllers have a support for ignoring ACK absence. Some of
them refer to this feature as a self test mode (e. g. SJA1000) and some
include it as a part of a loopback mode (e. g. MCP2510).

Setting the introduced flag via netlink should make CAN controller
perform a successful transmission, even if there is no acknowledgement
(dominant ACK bit) received.

Signed-off-by: Nikita Edward Baruzdin <nebaruzdin@gmail.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/include/uapi/linux/can/netlink.h b/include/uapi/linux/can/netlink.h
index 3bbf5c7..3e4323a 100644 (file)
--- a/include/uapi/linux/can/netlink.h
+++ b/include/uapi/linux/can/netlink.h
@@ -97,6 +97,7 @@ struct can_ctrlmode {
 #define CAN_CTRLMODE_ONE_SHOT          0x08    /* One-Shot mode */
 #define CAN_CTRLMODE_BERR_REPORTING    0x10    /* Bus-error reporting */
 #define CAN_CTRLMODE_FD                        0x20    /* CAN FD mode */
+#define CAN_CTRLMODE_PRESUME_ACK       0x40    /* Ignore missing CAN ACKs */
 
 /*
  * CAN device statistics