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can: isotp: add support for transmission without flow control

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Usually the ISO 15765-2 protocol is a point-to-point protocol to transfer
segmented PDUs to a dedicated receiver. This receiver sends a flow control
message to specify protocol options and timings (e.g. block size / STmin).

The so called functional addressing communication allows a 1:N
communication but is limited to a single frame length.

This new CAN_ISOTP_CF_BROADCAST allows an unconfirmed 1:N communication
with PDU length that would not fit into a single frame. This feature is
not covered by the ISO 15765-2 standard.

Link: https://lore.kernel.org/all/20220507115558.19065-1-socketcan@hartkopp.net
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp
2022-05-07 13:55:58 +02:00
committed by Marc Kleine-Budde
parent 51a0d5e511
commit 9f39d36530
2 changed files with 92 additions and 33 deletions
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25
include/uapi/linux/can/isotp.h
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@@ -124,18 +124,19 @@ struct can_isotp_ll_options {
/* flags for isotp behaviour */
#define CAN_ISOTP_LISTEN_MODE 0x001 /* listen only (do not send FC) */
#define CAN_ISOTP_EXTEND_ADDR 0x002 /* enable extended addressing */
#define CAN_ISOTP_TX_PADDING 0x004 /* enable CAN frame padding tx path */
#define CAN_ISOTP_RX_PADDING 0x008 /* enable CAN frame padding rx path */
#define CAN_ISOTP_CHK_PAD_LEN 0x010 /* check received CAN frame padding */
#define CAN_ISOTP_CHK_PAD_DATA 0x020 /* check received CAN frame padding */
#define CAN_ISOTP_HALF_DUPLEX 0x040 /* half duplex error state handling */
#define CAN_ISOTP_FORCE_TXSTMIN 0x080 /* ignore stmin from received FC */
#define CAN_ISOTP_FORCE_RXSTMIN 0x100 /* ignore CFs depending on rx stmin */
#define CAN_ISOTP_RX_EXT_ADDR 0x200 /* different rx extended addressing */
#define CAN_ISOTP_WAIT_TX_DONE 0x400 /* wait for tx completion */
#define CAN_ISOTP_SF_BROADCAST 0x800 /* 1-to-N functional addressing */
#define CAN_ISOTP_LISTEN_MODE 0x0001 /* listen only (do not send FC) */
#define CAN_ISOTP_EXTEND_ADDR 0x0002 /* enable extended addressing */
#define CAN_ISOTP_TX_PADDING 0x0004 /* enable CAN frame padding tx path */
#define CAN_ISOTP_RX_PADDING 0x0008 /* enable CAN frame padding rx path */
#define CAN_ISOTP_CHK_PAD_LEN 0x0010 /* check received CAN frame padding */
#define CAN_ISOTP_CHK_PAD_DATA 0x0020 /* check received CAN frame padding */
#define CAN_ISOTP_HALF_DUPLEX 0x0040 /* half duplex error state handling */
#define CAN_ISOTP_FORCE_TXSTMIN 0x0080 /* ignore stmin from received FC */
#define CAN_ISOTP_FORCE_RXSTMIN 0x0100 /* ignore CFs depending on rx stmin */
#define CAN_ISOTP_RX_EXT_ADDR 0x0200 /* different rx extended addressing */
#define CAN_ISOTP_WAIT_TX_DONE 0x0400 /* wait for tx completion */
#define CAN_ISOTP_SF_BROADCAST 0x0800 /* 1-to-N functional addressing */
#define CAN_ISOTP_CF_BROADCAST 0x1000 /* 1-to-N transmission w/o FC */
/* protocol machine default values */