netdev - Re: [PATCH v2 net-next 1/2] net: dsa: tag_dsa: Unify regular and ethertype DSA taggers

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Date:   Fri, 13 Nov 2020 16:27:09 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Tobias Waldekranz <tobias@...dekranz.com>
Cc:     davem@...emloft.net, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, olteanv@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/2] net: dsa: tag_dsa: Unify regular and
 ethertype DSA taggers

On Wed, 11 Nov 2020 14:11:52 +0100 Tobias Waldekranz wrote:
> Ethertype DSA encodes exactly the same information in the DSA tag as
> the non-ethertype variety. So refactor out the common parts and reuse
> them for both protocols.
> 
> This is ensures tag parsing and generation is always consistent across
> all mv88e6xxx chips.
> 
> While we are at it, explicitly deal with all possible CPU codes on
> receive, making sure to set offload_fwd_mark as appropriate.

Uncharacteristically unreviewed for a DSA patch :)

> + *
> + * Regular DSA
> + * -----------
> + * For untagged (in 802.1Q terms) packes, the swich will splice in the

packes -> packets
swich  -> switch

> + * tag between the SA and the ethertype of the original packet. Tagged
> + * frames will instead have their outermost .1Q tag converted to a DSA
> + * tag. It expects the same layout when receiving packets from the
> + * CPU.