netdev - Re: [PATCH net-next] net: mvpp2: increase MTU limit when XDP enabled

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Date:   Wed, 6 Jan 2021 13:33:28 +0100
From:   Marek Behún <kabel@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Sven Auhagen <sven.auhagen@...eatech.de>, netdev@...r.kernel.org,
        davem@...emloft.net, Jakub Kicinski <kuba@...nel.org>,
        Matteo Croce <mcroce@...rosoft.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Subject: Re: [PATCH net-next] net: mvpp2: increase MTU limit when XDP
 enabled

On Wed, 6 Jan 2021 13:32:05 +0100
Marek Behún <kabel@...nel.org> wrote:

> On Wed, 6 Jan 2021 12:56:08 +0100
> Marek Behún <kabel@...nel.org> wrote:
> 
> > I also to write a simple NAT masquerading program. I think XDP can
> > increase NAT throughput to 2.5gbps as well.
> 
> BTW currently if XDP modifies the packet, it has to modify the
> checksums accordingly. There is a helper for that even, bpf_csum_diff.

(from L3 forwards, if you modify ethhdr, you don't have to modify L2
checksum. You can't even see it...)