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| author | Oliver Hartkopp <socketcan@hartkopp.net> | 2024-02-12 22:35:50 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2024-02-13 11:47:13 +0100 |
| commit | c83c22ec1493c0b7cc77327bedbd387e295872b6 (patch) | |
| tree | c042bdebe7465ac220151fb3ddd156afd064a4e8 /net/can/af_can.c | |
| parent | 383de5664c87abe097d6369d18305c3a6e559bb2 (diff) | |
can: canxl: add virtual CAN network identifier support
CAN XL data frames contain an 8-bit virtual CAN network identifier (VCID).
A VCID value of zero represents an 'untagged' CAN XL frame.
To receive and send these optional VCIDs via CAN_RAW sockets a new socket
option CAN_RAW_XL_VCID_OPTS is introduced to define/access VCID content:
- tx: set the outgoing VCID value by the kernel (one fixed 8-bit value)
- tx: pass through VCID values from the user space (e.g. for traffic replay)
- rx: apply VCID receive filter (value/mask) to be passed to the user space
With the 'tx pass through' option CAN_RAW_XL_VCID_TX_PASS all valid VCID
values can be sent, e.g. to replay full qualified CAN XL traffic.
The VCID value provided for the CAN_RAW_XL_VCID_TX_SET option will
override the VCID value in the struct canxl_frame.prio defined for
CAN_RAW_XL_VCID_TX_PASS when both flags are set.
With a rx_vcid_mask of zero all possible VCID values (0x00 - 0xFF) are
passed to the user space when the CAN_RAW_XL_VCID_RX_FILTER flag is set.
Without this flag only untagged CAN XL frames (VCID = 0x00) are delivered
to the user space (default).
The 8-bit VCID is stored inside the CAN XL prio element (only in CAN XL
frames!) to not interfere with other CAN content or the CAN filters
provided by the CAN_RAW sockets and kernel infrastruture.
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20240212213550.18516-1-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'net/can/af_can.c')
| -rw-r--r-- | net/can/af_can.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/can/af_can.c b/net/can/af_can.c index 7343fd487dbe..707576eeeb58 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -865,6 +865,8 @@ static __init int can_init(void) /* check for correct padding to be able to use the structs similarly */ BUILD_BUG_ON(offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len) || + offsetof(struct can_frame, len) != + offsetof(struct canxl_frame, flags) || offsetof(struct can_frame, data) != offsetof(struct canfd_frame, data)); |