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Date:   Thu, 22 Jul 2021 17:02:58 +0300
From:   Boris Pismenny <>
To:     Eric Dumazet <>
Cc:     Boris Pismenny <>,
        David Ahern <>,
        Jakub Kicinski <>,
        David Miller <>,
        Saeed Mahameed <>,
        Christoph Hellwig <>,,,, Al Viro <>,,,, netdev <>,,,,
        Boris Pismenny <>,
        Ben Ben-Ishay <>,
        Or Gerlitz <>,
        Yoray Zack <>
Subject: Re: [PATCH v5 net-next 01/36] net: Introduce direct data placement
 tcp offload

On 22/07/2021 16:39, Eric Dumazet wrote:
> On Thu, Jul 22, 2021 at 3:33 PM Boris Pismenny <> wrote:
>> Sorry. My response above was about skb_condense which I've confused with
>> tcp_collapse.
>> In tcp_collapse, we could allow the copy, but the problem is CRC, which
>> like TLS's skb->decrypted marks that the data passed the digest
>> validation in the NIC. If we allow collapsing SKBs with mixed marks, we
>> will need to force software copy+crc verification. As TCP collapse is
>> indeed rare and the offload is opportunistic in nature, we can make this
>> change and submit another version, but I'm confused; why was it OK for
>> TLS, while it is not OK for DDP+CRC?
> Ah.... I guess I was focused on the DDP part, while all your changes
> are really about the CRC part.
> Perhaps having an accessor to express the CRC status (and not be
> confused by the DDP part)
>  could help the intent of the code.

An accessor function sounds like a great idea for readability, thanks Eric!

We will re-spin the series and add it to v6.

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