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With ISO 15765-2:2016 the PDU size is not limited to 2^12 - 1 (4095) bytes but can be represented as a 32 bit unsigned integer value which allows 2^32 - 1 bytes (~4GB). The use-cases like automotive unified diagnostic services (UDS) and flashing of ECUs still use the small static buffers which are provided at socket creation time. When a use-case requires to transfer PDUs up to 1025 kByte the maximum PDU size can now be extended by setting the module parameter max_pdu_size. The extended size buffers are only allocated on a per-socket/connection base when needed at run-time. changes since v2: https://lore.kernel.org/all/20230313172510.3851-1-socketcan@hartkopp.net - use ARRAY_SIZE() to reference DEFAULT_MAX_PDU_SIZE only at one place changes since v1: https://lore.kernel.org/all/20230311143446.3183-1-socketcan@hartkopp.net - limit the minimum 'max_pdu_size' to 4095 to maintain the classic behavior before ISO 15765-2:2016 Link: https://github.com/raspberrypi/linux/issues/5371 Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Link: https://lore.kernel.org/all/20230326115911.15094-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>