1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 20d66548aSOliver Hartkopp# 30d66548aSOliver Hartkopp# Controller Area Network (CAN) network layer core configuration 40d66548aSOliver Hartkopp# 50d66548aSOliver Hartkopp 60d66548aSOliver Hartkoppmenuconfig CAN 70d66548aSOliver Hartkopp tristate "CAN bus subsystem support" 8a7f7f624SMasahiro Yamada help 90d66548aSOliver Hartkopp Controller Area Network (CAN) is a slow (up to 1Mbit/s) serial 1026bca9feSRobert P. J. Day communications protocol. Development of the CAN bus started in 1126bca9feSRobert P. J. Day 1983 at Robert Bosch GmbH, and the protocol was officially 1226bca9feSRobert P. J. Day released in 1986. The CAN bus was originally mainly for automotive, 1326bca9feSRobert P. J. Day but is now widely used in marine (NMEA2000), industrial, and medical 1426bca9feSRobert P. J. Day applications. More information on the CAN network protocol family 1526bca9feSRobert P. J. Day PF_CAN is contained in <Documentation/networking/can.rst>. 160d66548aSOliver Hartkopp 170d66548aSOliver Hartkopp If you want CAN support you should say Y here and also to the 18*d7786af5SVincent Mailhol specific driver for your controller(s) under the Network device 19*d7786af5SVincent Mailhol support section. 20c18ce101SOliver Hartkopp 2177136836SMarc Kleine-Buddeif CAN 2277136836SMarc Kleine-Budde 23c18ce101SOliver Hartkoppconfig CAN_RAW 24c18ce101SOliver Hartkopp tristate "Raw CAN Protocol (raw access with CAN-ID filtering)" 25f66b0301SMarc Kleine-Budde default y 26a7f7f624SMasahiro Yamada help 27c18ce101SOliver Hartkopp The raw CAN protocol option offers access to the CAN bus via 28c18ce101SOliver Hartkopp the BSD socket API. You probably want to use the raw socket in 29c18ce101SOliver Hartkopp most cases where no higher level protocol is being used. The raw 30c18ce101SOliver Hartkopp socket has several filter options e.g. ID masking / error frames. 31c18ce101SOliver Hartkopp To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW. 32ffd980f9SOliver Hartkopp 33ffd980f9SOliver Hartkoppconfig CAN_BCM 34ffd980f9SOliver Hartkopp tristate "Broadcast Manager CAN Protocol (with content filtering)" 35f66b0301SMarc Kleine-Budde default y 36a7f7f624SMasahiro Yamada help 37ffd980f9SOliver Hartkopp The Broadcast Manager offers content filtering, timeout monitoring, 38ffd980f9SOliver Hartkopp sending of RTR frames, and cyclic CAN messages without permanent user 39ffd980f9SOliver Hartkopp interaction. The BCM can be 'programmed' via the BSD socket API and 40ffd980f9SOliver Hartkopp informs you on demand e.g. only on content updates / timeouts. 41ffd980f9SOliver Hartkopp You probably want to use the bcm socket in most cases where cyclic 42ffd980f9SOliver Hartkopp CAN messages are used on the bus (e.g. in automotive environments). 43ffd980f9SOliver Hartkopp To use the Broadcast Manager, use AF_CAN with protocol CAN_BCM. 44ccb29637SOliver Hartkopp 45c1aabdf3SOliver Hartkoppconfig CAN_GW 46c1aabdf3SOliver Hartkopp tristate "CAN Gateway/Router (with netlink configuration)" 47f66b0301SMarc Kleine-Budde default y 48a7f7f624SMasahiro Yamada help 49c1aabdf3SOliver Hartkopp The CAN Gateway/Router is used to route (and modify) CAN frames. 50c1aabdf3SOliver Hartkopp It is based on the PF_CAN core infrastructure for msg filtering and 51c1aabdf3SOliver Hartkopp msg sending and can optionally modify routed CAN frames on the fly. 52c1aabdf3SOliver Hartkopp CAN frames can be routed between CAN network interfaces (one hop). 53c1aabdf3SOliver Hartkopp They can be modified with AND/OR/XOR/SET operations as configured 54c1aabdf3SOliver Hartkopp by the netlink configuration interface known e.g. from iptables. 55ccb29637SOliver Hartkopp 569d71dd0cSThe j1939 authorssource "net/can/j1939/Kconfig" 579d71dd0cSThe j1939 authors 58e057dd3fSOliver Hartkoppconfig CAN_ISOTP 59e057dd3fSOliver Hartkopp tristate "ISO 15765-2:2016 CAN transport protocol" 60e057dd3fSOliver Hartkopp help 61e057dd3fSOliver Hartkopp CAN Transport Protocols offer support for segmented Point-to-Point 62e057dd3fSOliver Hartkopp communication between CAN nodes via two defined CAN Identifiers. 63e057dd3fSOliver Hartkopp As CAN frames can only transport a small amount of data bytes 64e057dd3fSOliver Hartkopp (max. 8 bytes for 'classic' CAN and max. 64 bytes for CAN FD) this 655a7de240SGeert Uytterhoeven segmentation is needed to transport longer Protocol Data Units (PDU) 665a7de240SGeert Uytterhoeven as needed e.g. for vehicle diagnosis (UDS, ISO 14229) or IP-over-CAN 675a7de240SGeert Uytterhoeven traffic. 68e057dd3fSOliver Hartkopp This protocol driver implements data transfers according to 69e057dd3fSOliver Hartkopp ISO 15765-2:2016 for 'classic' CAN and CAN FD frame types. 70ac911bfeSOliver Hartkopp If you want to perform automotive vehicle diagnostic services (UDS), 71ac911bfeSOliver Hartkopp say 'y'. 72e057dd3fSOliver Hartkopp 7377136836SMarc Kleine-Buddeendif 74