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

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Date:   Sun, 8 Nov 2020 13:27:32 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     "zyjzyj2000@...il.com" <zyjzyj2000@...il.com>, kuba@...nel.org,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] RDMA/rxe: Fetch skb packets from ethernet layer

On Sun, Nov 8, 2020 at 1:24 PM Zhu Yanjun <zyjzyj2000@...il.com> wrote:
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [PATCH 1/1] RDMA/rxe: Fetch skb packets from ethernet layer
> 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
>
>
> 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.

Why? Is there any risks?

Zhu Yanjun
>
> The tunnel socket is a correct approach.