netdev - Re: [RFC PATCH net-next 10/12] Documentation: networking: dsa: add paragraph for the HSR/PRP offload

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Date:   Thu, 25 Feb 2021 02:42:04 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ido Schimmel <idosch@...sch.org>,
        DENG Qingfang <dqfext@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        George McCollister <george.mccollister@...il.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Subject: Re: [RFC PATCH net-next 10/12] Documentation: networking: dsa: add
 paragraph for the HSR/PRP offload

> +IEC 62439-3 (HSR/PRP)
> +---------------------
> +
> +The Parallel Redundancy Protocol (PRP) is a network redundancy protocol which
> +works by duplicating and sequence numbering packets through two independent L2
> +networks (which are unaware of the PRP tail tags carried in the packets), and
> +eliminating the duplicates at the receiver. The High-availability Seamless
> +Redundancy (HSR) protocol is similar in concept, except all nodes that carry
> +the redundant traffic are aware of the fact that it is HSR-tagged (because HSR
> +uses a header with an EtherType of 0x892f) and are physically connected in a
> +ring topology. Both HSR and PRP use supervision frames for monitoring the

I don't know HSR/PRP terms. Should it be supervisory instead of
supervision?

> +health of the network and for discovering the other nodes.

Either "discovering other nodes" or "discovery of other nodes".

> +
> +In Linux, both HSR and PRP are implemented in the hsr driver, which
> +instantiates a virtual, stackable network interface with two member ports.
> +The driver only implements the basic roles of DANH (Doubly Attached Node
> +implementing HSR) and DANP (Doubly Attached Node implementing PRP); the roles
> +of RedBox and QuadBox aren't (therefore, bridging a hsr network interface with

In colloquial English, you can get away with just 'aren't'. But in
Queens English, you should follow it with something, in this case
'supported'.

	Andrew