netdev - Re: [RESEND PATCH net-next 4/4] net: dsa: xrs700x: add HSR offloading support

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Message-ID: <20210201152913.khrvofpnkghrsba2@skbuf>
Date:   Mon, 1 Feb 2021 17:29:13 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     George McCollister <george.mccollister@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Corbet <corbet@....net>, netdev@...r.kernel.org
Subject: Re: [RESEND PATCH net-next 4/4] net: dsa: xrs700x: add HSR
 offloading support

On Mon, Feb 01, 2021 at 08:05:03AM -0600, George McCollister wrote:
> Add offloading for HSR/PRP (IEC 62439-3) tag insertion, tag removal
> forwarding and duplication supported by the xrs7000 series switches.
> 
> Only HSR v1 and PRP v1 are supported by the xrs7000 series switches (HSR
> v0 is not).
> 
> Signed-off-by: George McCollister <george.mccollister@...il.com>
> ---

Does this switch discard duplicates or does it not? If it does, what
algorithm does it use? Does it not need some sort of runtime
communication with the hsr master, like for the nodes table?
How many streams can it keep track of? What happens when the ring is
larger than the switch can keep track of in its internal Link Redundancy
Entity?