netdev - Re: [PATCH net-next v3 2/4] net: hsr: add offloading support

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Date:   Wed, 10 Feb 2021 11:37:39 +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>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Jonathan Corbet <corbet@....net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/4] net: hsr: add offloading support

On Tue, Feb 09, 2021 at 07:02:11PM -0600, George McCollister wrote:
> Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion
> tag removal, duplicate generation and forwarding.
> 
> For HSR, insertion involves the switch adding a 6 byte HSR header after
> the 14 byte Ethernet header. For PRP it adds a 6 byte trailer.
> 
> Tag removal involves automatically stripping the HSR/PRP header/trailer
> in the switch. This is possible when the switch also performs auto
> deduplication using the HSR/PRP header/trailer (making it no longer
> required).
> 
> Forwarding involves automatically forwarding between redundant ports in
> an HSR. This is crucial because delay is accumulated as a frame passes
> through each node in the ring.
> 
> Duplication involves the switch automatically sending a single frame
> from the CPU port to both redundant ports. This is required because the
> inserted HSR/PRP header/trailer must contain the same sequence number
> on the frames sent out both redundant ports.
> 
> Export is_hsr_master so DSA can tell them apart from other devices in
> dsa_slave_changeupper.
> 
> Signed-off-by: George McCollister <george.mccollister@...il.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>