write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/net/hsr/Kconfig
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+# SPDX-License-Identifier: GPL-2.0-only
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 #
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 # IEC 62439-3 High-availability Seamless Redundancy
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 #
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 config HSR
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-	tristate "High-availability Seamless Redundancy (HSR)"
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-	---help---
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-	  If you say Y here, then your Linux box will be able to act as a
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-	  DANH ("Doubly attached node implementing HSR"). For this to work,
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-	  your Linux box needs (at least) two physical Ethernet interfaces,
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-	  and it must be connected as a node in a ring network together with
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-	  other HSR capable nodes.
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+	tristate "High-availability Seamless Redundancy (HSR & PRP)"
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+	help
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+	  This enables IEC 62439 defined High-availability Seamless
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+	  Redundancy (HSR) and Parallel Redundancy Protocol (PRP).
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-	  All Ethernet frames sent over the hsr device will be sent in both
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-	  directions on the ring (over both slave ports), giving a redundant,
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-	  instant fail-over network. Each HSR node in the ring acts like a
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-	  bridge for HSR frames, but filters frames that have been forwarded
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-	  earlier.
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+	  If you say Y here, then your Linux box will be able to act as a
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+	  DANH ("Doubly attached node implementing HSR") or DANP ("Doubly
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+	  attached node implementing PRP"). For this to work, your Linux box
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+	  needs (at least) two physical Ethernet interfaces.
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+
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+	  For DANH, it must be connected as a node in a ring network together
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+	  with other HSR capable nodes. All Ethernet frames sent over the HSR
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+	  device will be sent in both directions on the ring (over both slave
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+	  ports), giving a redundant, instant fail-over network. Each HSR node
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+	  in the ring acts like a bridge for HSR frames, but filters frames
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+	  that have been forwarded earlier.
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+
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+	  For DANP, it must be connected as a node connecting to two
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+	  separate networks over the two slave interfaces. Like HSR, Ethernet
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+	  frames sent over the PRP device will be sent to both networks giving
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+	  a redundant, instant fail-over network. Unlike HSR, PRP networks
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+	  can have Singly Attached Nodes (SAN) such as PC, printer, bridges
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+	  etc and will be able to communicate with DANP nodes.
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 	  This code is a "best effort" to comply with the HSR standard as
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 	  described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1),
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-	  but no compliancy tests have been made. Use iproute2 to select
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-	  the version you desire.
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+	  and PRP standard described in IEC 62439-4:2012 (PRP), but no
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+	  compliancy tests have been made. Use iproute2 to select the protocol
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+	  you would like to use.
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 	  You need to perform any and all necessary tests yourself before
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 	  relying on this code in a safety critical system!