netdev - Re: [PATCH v5 net-next 1/2] ravb: Add Rx checksum offload support for GbEth

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Message-ID: <eab8cbd7-f630-375e-546c-4f3458e91cdc@omp.ru>
Date: Wed, 7 Feb 2024 22:47:28 +0300
From: Sergey Shtylyov <s.shtylyov@....ru>
To: Biju Das <biju.das.jz@...renesas.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>, Yoshihiro Shimoda
	<yoshihiro.shimoda.uh@...esas.com>, Wolfram Sang
	<wsa+renesas@...g-engineering.com>, Nikita Yushchenko
	<nikita.yoush@...entembedded.com>, <netdev@...r.kernel.org>,
	<linux-renesas-soc@...r.kernel.org>, Geert Uytterhoeven
	<geert+renesas@...der.be>, Prabhakar Mahadev Lad
	<prabhakar.mahadev-lad.rj@...renesas.com>, Biju Das <biju.das.au@...il.com>
Subject: Re: [PATCH v5 net-next 1/2] ravb: Add Rx checksum offload support for
 GbEth

On 2/7/24 12:28 PM, Biju Das wrote:

> TOE has hardware support for calculating IP header and TCP/UDP/ICMP
> checksum for both IPv4 and IPv6.
> 
> Add Rx checksum offload supported by TOE for IPv4 and TCP/UDP protocols.
> 
> For Rx, the 4-byte result of checksum calculation is attached to the
> Ethernet frames.First 2-bytes is result of IPv4 header checksum and next
> 2-bytes is TCP/UDP/ICMP checksum.
> 
> If a frame does not have checksum error, 0x0000 is attached as checksum
> calculation result. For unsupported frames 0xFFFF is attached as checksum
> calculation result. In case of an IPv6 packet, IPv4 checksum is always set
> to 0xFFFF.
> 
> We can test this functionality by the below commands
> 
> ethtool -K eth0 rx on --> to turn on Rx checksum offload
> ethtool -K eth0 rx off --> to turn off Rx checksum offload
> 
> Signed-off-by: Biju Das <biju.das.jz@...renesas.com>

Reviewed-by: Sergey Shtylyov <s.shtylyov@....ru>

[...]

MBR, Sergey