netdev - Re: [PATCH net-next v3 1/4] net: hsr: generate supervision frame without HSR/PRP tag

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Message-ID: <20210210093310.c3el4m57hmso4kya@skbuf>
Date:   Wed, 10 Feb 2021 11:33:10 +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 1/4] net: hsr: generate supervision frame
 without HSR/PRP tag

On Tue, Feb 09, 2021 at 07:02:10PM -0600, George McCollister wrote:
> For a switch to offload insertion of HSR/PRP tags, frames must not be
> sent to the CPU facing switch port with a tag. Generate supervision frames
> (eth type ETH_P_PRP) without HSR v1 (ETH_P_HSR)/PRP tag and rely on
> create_tagged_frame which inserts it later. This will allow skipping the
> tag insertion for all outgoing frames in the future which is required for
> HSR v1/PRP tag insertions to be offloaded.
> 
> HSR v0 supervision frames always contain tag information so insertion of
> the tag can't be offloaded. IEC 62439-3 Ed.2.0 (HSR v1) specifically
> notes that this was changed since v0 to allow offloading.
> 
> Signed-off-by: George McCollister <george.mccollister@...il.com>
> ---

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