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

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Date:   Wed, 11 Nov 2020 19:15:36 +0800
From:   Zhu Yanjun <zyjzyj2000@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     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 Tue, Nov 10, 2020 at 9:58 AM Zhu Yanjun <zyjzyj2000@...il.com> wrote:
>
> On Tue, Nov 10, 2020 at 2:25 AM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > On Sun, 8 Nov 2020 13:27:32 +0800 Zhu Yanjun wrote:
> > > On Sun, Nov 8, 2020 at 1:24 PM Zhu Yanjun <zyjzyj2000@...il.com> wrote:
> > > > 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?
> >
> > Are there risks in layering violations? Yes.
> >
> > For example - you do absolutely no protocol parsing,
>
> Protocol parsing is in rxe driver.
>
> > checksum validation, only support IPv4, etc.
>
> Since only ipv4 is supported in rxe, if ipv6 is supported in rxe, I
> will add ipv6.
>
> >
> > Besides it also makes the code far less maintainable, rx_handler is a
>
> This rx_handler is also used in openvswitch and bridge.

in Vacation. I will reply as soon as I come back.

Zhu Yanjun

>
> Zhu Yanjun
>
> > singleton, etc. etc.
> >
> > > > The tunnel socket is a correct approach.