netdev - Re: [PATCH 1/1] RDMA/rxe: Fetch skb packets from ethernet layer

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Message-ID: <20201107122617.55d0909c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Sat, 7 Nov 2020 12:26:17 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Zhu Yanjun <yanjunz@...dia.com>
Cc:     dledford@...hat.com, jgg@...pe.ca, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] RDMA/rxe: Fetch skb packets from ethernet layer

On Thu,  5 Nov 2020 19:12:01 +0800 Zhu Yanjun wrote:
> In the original design, in rx, skb packet would pass ethernet
> layer and IP layer, eventually reach udp tunnel.
> 
> Now rxe fetches the skb packets from the ethernet layer directly.
> So this bypasses the IP and UDP layer. As such, the skb packets
> are sent to the upper protocals directly from the ethernet layer.
> 
> This increases bandwidth and decreases latency.
> 
> Signed-off-by: Zhu Yanjun <yanjunz@...dia.com>

Nope, no stealing UDP packets with some random rx handlers.

The tunnel socket is a correct approach.