1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # 2 #
3 # Controller Area Network (CAN) network layer 3 # Controller Area Network (CAN) network layer core configuration
4 # 4 #
5 5
6 menuconfig CAN 6 menuconfig CAN
7 tristate "CAN bus subsystem support" 7 tristate "CAN bus subsystem support"
8 help 8 help
9 Controller Area Network (CAN) is a s 9 Controller Area Network (CAN) is a slow (up to 1Mbit/s) serial
10 communications protocol. Development 10 communications protocol. Development of the CAN bus started in
11 1983 at Robert Bosch GmbH, and the p 11 1983 at Robert Bosch GmbH, and the protocol was officially
12 released in 1986. The CAN bus was or 12 released in 1986. The CAN bus was originally mainly for automotive,
13 but is now widely used in marine (NM 13 but is now widely used in marine (NMEA2000), industrial, and medical
14 applications. More information on th 14 applications. More information on the CAN network protocol family
15 PF_CAN is contained in <Documentatio 15 PF_CAN is contained in <Documentation/networking/can.rst>.
16 16
17 If you want CAN support you should s 17 If you want CAN support you should say Y here and also to the
18 specific driver for your controller( !! 18 specific driver for your controller(s) below.
19 support section. <<
20 19
21 if CAN 20 if CAN
22 21
23 config CAN_RAW 22 config CAN_RAW
24 tristate "Raw CAN Protocol (raw access 23 tristate "Raw CAN Protocol (raw access with CAN-ID filtering)"
25 default y 24 default y
26 help 25 help
27 The raw CAN protocol option offers a 26 The raw CAN protocol option offers access to the CAN bus via
28 the BSD socket API. You probably wan 27 the BSD socket API. You probably want to use the raw socket in
29 most cases where no higher level pro 28 most cases where no higher level protocol is being used. The raw
30 socket has several filter options e. 29 socket has several filter options e.g. ID masking / error frames.
31 To receive/send raw CAN messages, us 30 To receive/send raw CAN messages, use AF_CAN with protocol CAN_RAW.
32 31
33 config CAN_BCM 32 config CAN_BCM
34 tristate "Broadcast Manager CAN Protoc 33 tristate "Broadcast Manager CAN Protocol (with content filtering)"
35 default y 34 default y
36 help 35 help
37 The Broadcast Manager offers content 36 The Broadcast Manager offers content filtering, timeout monitoring,
38 sending of RTR frames, and cyclic CA 37 sending of RTR frames, and cyclic CAN messages without permanent user
39 interaction. The BCM can be 'program 38 interaction. The BCM can be 'programmed' via the BSD socket API and
40 informs you on demand e.g. only on c 39 informs you on demand e.g. only on content updates / timeouts.
41 You probably want to use the bcm soc 40 You probably want to use the bcm socket in most cases where cyclic
42 CAN messages are used on the bus (e. 41 CAN messages are used on the bus (e.g. in automotive environments).
43 To use the Broadcast Manager, use AF 42 To use the Broadcast Manager, use AF_CAN with protocol CAN_BCM.
44 43
45 config CAN_GW 44 config CAN_GW
46 tristate "CAN Gateway/Router (with net 45 tristate "CAN Gateway/Router (with netlink configuration)"
47 default y 46 default y
48 help 47 help
49 The CAN Gateway/Router is used to ro 48 The CAN Gateway/Router is used to route (and modify) CAN frames.
50 It is based on the PF_CAN core infra 49 It is based on the PF_CAN core infrastructure for msg filtering and
51 msg sending and can optionally modif 50 msg sending and can optionally modify routed CAN frames on the fly.
52 CAN frames can be routed between CAN 51 CAN frames can be routed between CAN network interfaces (one hop).
53 They can be modified with AND/OR/XOR 52 They can be modified with AND/OR/XOR/SET operations as configured
54 by the netlink configuration interfa 53 by the netlink configuration interface known e.g. from iptables.
55 54
56 source "net/can/j1939/Kconfig" 55 source "net/can/j1939/Kconfig"
57 56
58 config CAN_ISOTP 57 config CAN_ISOTP
59 tristate "ISO 15765-2 CAN transport pr !! 58 tristate "ISO 15765-2:2016 CAN transport protocol"
60 help 59 help
61 CAN Transport Protocols offer suppor 60 CAN Transport Protocols offer support for segmented Point-to-Point
62 communication between CAN nodes via 61 communication between CAN nodes via two defined CAN Identifiers.
63 This protocol driver implements segm <<
64 (aka Classical CAN, CAN 2.0B) and CA <<
65 introduced with ISO 15765-2:2016. <<
66 As CAN frames can only transport a s 62 As CAN frames can only transport a small amount of data bytes
67 (max. 8 bytes for CAN CC and max. 64 !! 63 (max. 8 bytes for 'classic' CAN and max. 64 bytes for CAN FD) this
68 segmentation is needed to transport 64 segmentation is needed to transport longer Protocol Data Units (PDU)
69 as needed e.g. for vehicle diagnosis 65 as needed e.g. for vehicle diagnosis (UDS, ISO 14229) or IP-over-CAN
70 traffic. 66 traffic.
>> 67 This protocol driver implements data transfers according to
>> 68 ISO 15765-2:2016 for 'classic' CAN and CAN FD frame types.
>> 69 If you want to perform automotive vehicle diagnostic services (UDS),
>> 70 say 'y'.
>> 71
>> 72 source "drivers/net/can/Kconfig"
71 73
72 endif 74 endif
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