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 07:33:35 -0600
From:   George McCollister <george.mccollister@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vladimir Oltean <olteanv@...il.com>, 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>,
        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

On Wed, Feb 24, 2021 at 7:42 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > +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?

IEC 62439-3 refers to them primarily as supervision frames however
supervisory frames also appears once in the document.

>
> > +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