cangen: auto mix of CC/FD/XL frames#608
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hartkopp merged 2 commits intolinux-can:masterfrom Dec 3, 2025
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Nov 27, 2025
hartkopp
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- automatically detect which CAN frame types can be send in the mix mode (-m option)
- handle the CAN XL-only case when the CAN_RAW socket rejects unsupported CC/FD frames
Automatically create FD/XL content in mixed mode when the CAN interface is capable to deal with it. Suggested-by: Vincent Mailhol <mailhol@kernel.org> Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
The mixed mode is able to automatically detect the potential supported CAN frame types CAN CC/FD/XL by checking the CAN device MTU at startup. Usually the MTU shows which CAN frame types can be sent but in the case of CAN XL in CANXL-only mode CC and FD frames can not be sent on the CAN_RAW socket. Since this patch [1] the CAN_RAW socket rejects unsupported CAN frames and returns -EINVAL as error code. With this change in cangen the CC and FD frame generation can be disabled in mixed mode at runtime. [1] https://lore.kernel.org/linux-can/20251125123859.3924-17-socketcan@hartkopp.net/T/#u Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
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