xref: /linux/net/hsr/Kconfig (revision 4b4193256c8d3bc3a5397b5cd9494c2ad386317d)
1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only
2f421436aSArvid Brodin#
3f421436aSArvid Brodin# IEC 62439-3 High-availability Seamless Redundancy
4f421436aSArvid Brodin#
5f421436aSArvid Brodin
6f421436aSArvid Brodinconfig HSR
7*8f4c0e01SMurali Karicheri	tristate "High-availability Seamless Redundancy (HSR & PRP)"
8a7f7f624SMasahiro Yamada	help
9*8f4c0e01SMurali Karicheri	  This enables IEC 62439 defined High-availability Seamless
10*8f4c0e01SMurali Karicheri	  Redundancy (HSR) and Parallel Redundancy Protocol (PRP).
11f421436aSArvid Brodin
12*8f4c0e01SMurali Karicheri	  If you say Y here, then your Linux box will be able to act as a
13*8f4c0e01SMurali Karicheri	  DANH ("Doubly attached node implementing HSR") or DANP ("Doubly
14*8f4c0e01SMurali Karicheri	  attached node implementing PRP"). For this to work, your Linux box
15*8f4c0e01SMurali Karicheri	  needs (at least) two physical Ethernet interfaces.
16*8f4c0e01SMurali Karicheri
17*8f4c0e01SMurali Karicheri	  For DANH, it must be connected as a node in a ring network together
18*8f4c0e01SMurali Karicheri	  with other HSR capable nodes. All Ethernet frames sent over the HSR
19*8f4c0e01SMurali Karicheri	  device will be sent in both directions on the ring (over both slave
20*8f4c0e01SMurali Karicheri	  ports), giving a redundant, instant fail-over network. Each HSR node
21*8f4c0e01SMurali Karicheri	  in the ring acts like a bridge for HSR frames, but filters frames
22*8f4c0e01SMurali Karicheri	  that have been forwarded earlier.
23*8f4c0e01SMurali Karicheri
24*8f4c0e01SMurali Karicheri	  For DANP, it must be connected as a node connecting to two
25*8f4c0e01SMurali Karicheri	  separate networks over the two slave interfaces. Like HSR, Ethernet
26*8f4c0e01SMurali Karicheri	  frames sent over the PRP device will be sent to both networks giving
27*8f4c0e01SMurali Karicheri	  a redundant, instant fail-over network. Unlike HSR, PRP networks
28*8f4c0e01SMurali Karicheri	  can have Singly Attached Nodes (SAN) such as PC, printer, bridges
29*8f4c0e01SMurali Karicheri	  etc and will be able to communicate with DANP nodes.
30f421436aSArvid Brodin
31f421436aSArvid Brodin	  This code is a "best effort" to comply with the HSR standard as
32ee1c2797SPeter Heise	  described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1),
33*8f4c0e01SMurali Karicheri	  and PRP standard described in IEC 62439-4:2012 (PRP), but no
34*8f4c0e01SMurali Karicheri	  compliancy tests have been made. Use iproute2 to select the protocol
35*8f4c0e01SMurali Karicheri	  you would like to use.
36f421436aSArvid Brodin
37f421436aSArvid Brodin	  You need to perform any and all necessary tests yourself before
38f421436aSArvid Brodin	  relying on this code in a safety critical system!
39f421436aSArvid Brodin
40f421436aSArvid Brodin	  If unsure, say N.
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