netdev - Re: [PATCH net v3 1/1] openvswitch: Fix setting ipv6 fields causing hw csum failure

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Date:   Thu, 17 Feb 2022 09:42:57 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Paul Blakey <paulb@...dia.com>
Cc:     <dev@...nvswitch.org>, <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        "Pravin B Shelar" <pshelar@....org>, <davem@...emloft.net>,
        Eelco Chaudron <echaudro@...hat.com>,
        Oz Shlomo <ozsh@...dia.com>, Vlad Buslov <vladbu@...dia.com>,
        Roi Dayan <roid@...dia.com>,
        Ariel Levkovich <lariel@...dia.com>
Subject: Re: [PATCH net v3 1/1] openvswitch: Fix setting ipv6 fields causing
 hw csum failure

On Wed, 16 Feb 2022 15:53:08 +0200 Paul Blakey wrote:
> +		skb->csum =
> +			~csum_block_add(csum_block_sub(~skb->csum,
> +						       (__force __wsum) (ipv6_tclass << 4), 1),
> +					(__force __wsum) (old_ipv6_tclass << 4), 1);

Please add a wcsum_replace4() helper to include/net/checksum.h
It should work like the (misnamed) csum_relace4() helper and have
similar params just wsum instead of sum16.