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Parallel Redundancy Protocol (PRP) is another redundancy protocol introduced by IEC 63439 standard. It is similar to HSR in many aspects:- - Use a pair of Ethernet interfaces to created the PRP device - Use a 6 byte redundancy protocol part (RCT, Redundancy Check Trailer) similar to HSR Tag. - Has Link Redundancy Entity (LRE) that works with RCT to implement redundancy. Key difference is that the protocol unit is a trailer instead of a prefix as in HSR. That makes it inter-operable with tradition network components such as bridges/switches which treat it as pad bytes, whereas HSR nodes requires some kind of translators (Called redbox) to talk to regular network devices. This features allows regular linux box to be converted to a DAN-P box. DAN-P stands for Dual Attached Node - PRP similar to DAN-H (Dual Attached Node - HSR). Add a comment at the header/source code to explicitly state that the driver files also handles PRP protocol as well. Signed-off-by: Murali Karicheri <m-karicheri2@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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SPDX-License-Identifier: GPL-2.0-only
IEC 62439-3 High-availability Seamless Redundancy
config HSR tristate "High-availability Seamless Redundancy (HSR & PRP)" help This enables IEC 62439 defined High-availability Seamless Redundancy (HSR) and Parallel Redundancy Protocol (PRP).
If you say Y here, then your Linux box will be able to act as a
DANH ("Doubly attached node implementing HSR") or DANP ("Doubly
attached node implementing PRP"). For this to work, your Linux box
needs (at least) two physical Ethernet interfaces.
For DANH, it must be connected as a node in a ring network together
with other HSR capable nodes. All Ethernet frames sent over the HSR
device will be sent in both directions on the ring (over both slave
ports), giving a redundant, instant fail-over network. Each HSR node
in the ring acts like a bridge for HSR frames, but filters frames
that have been forwarded earlier.
For DANP, it must be connected as a node connecting to two
separate networks over the two slave interfaces. Like HSR, Ethernet
frames sent over the PRP device will be sent to both networks giving
a redundant, instant fail-over network. Unlike HSR, PRP networks
can have Singly Attached Nodes (SAN) such as PC, printer, bridges
etc and will be able to communicate with DANP nodes.
This code is a "best effort" to comply with the HSR standard as
described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1),
and PRP standard described in IEC 62439-4:2012 (PRP), but no
compliancy tests have been made. Use iproute2 to select the protocol
you would like to use.
You need to perform any and all necessary tests yourself before
relying on this code in a safety critical system!
If unsure, say N.