netdev - Re: [PATCH net-next] net/hanic: Add the hanic network interface for high availability links

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Message-ID: <20221121195810.3f32d4fd@kernel.org>
Date:   Mon, 21 Nov 2022 19:58:10 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Steve Williams <steve.williams@...cruise.com>
Cc:     netdev@...r.kernel.org, vinicius.gomes@...el.com,
        vladimir.oltean@....com, xiaoliang.yang_1@....com
Subject: Re: [PATCH net-next] net/hanic: Add the hanic network interface for
 high availability links

On Fri, 18 Nov 2022 15:26:39 -0800 Steve Williams wrote:
> This is a virtual device that implements support for 802.1cb R-TAGS
> and duplication and deduplication. The hanic nic itself is not a device,
> but enlists ethernet nics to act as parties in a high-availability
> link. Outbound packets are duplicated and tagged with R-TAGs, then
> set out the enlisted links. Inbound packets with R-TAGs have their
> R-TAGs removed, and duplicates are dropped to complete the link. The
> algorithm handles links being completely disconnected, sporadic packet
> loss, and out-of-order arrivals.
> 
> To the extent possible, the link is self-configuring: It detects and
> brings up streams as R-TAG'ed packets are detected, and creates streams
> for outbound packets unless explicitly filtered to skip tagging.

Superficially pattern matching on the standard - there has been 
a discussion about 802.1cb support in the HW offload context:

https://lore.kernel.org/netdev/20210928114451.24956-1-xiaoliang.yang_1@nxp.com/

Would be great if the two effort could align.