netdev - Re: [PATCH net-next 18/20] netkit: Add io

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Message-ID: <0984a479-9615-4580-86fb-d173252908d5@iogearbox.net>
Date: Mon, 22 Sep 2025 18:23:44 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: zf <zf15750701@...il.com>, netdev@...r.kernel.org
Cc: bpf@...r.kernel.org, kuba@...nel.org, davem@...emloft.net,
 razor@...ckwall.org, pabeni@...hat.com, willemb@...gle.com, sdf@...ichev.me,
 john.fastabend@...il.com, martin.lau@...nel.org, jordan@...fe.io,
 maciej.fijalkowski@...el.com, magnus.karlsson@...el.com,
 David Wei <dw@...idwei.uk>, yangzhenze@...edance.com,
 Dongdong Wang <wangdongdong.6@...edance.com>
Subject: Re: [PATCH net-next 18/20] netkit: Add io_uring zero-copy support for
 TCP

On 9/22/25 5:17 AM, zf wrote:
> 在 2025/9/20 05:31, Daniel Borkmann 写道:
[...]
>> Remote io_uring client:
>>
>>    # ./iou-zcrx -c -h 1.2.3.4 -p 5000 -l 12840 -z 65536
>>
>> We have tested the above against a dual-port Nvidia ConnectX-6 (mlx5)
>> 100G NIC as well as Broadcom BCM957504 (bnxt_en) 100G NIC, both
>> supporting TCP header/data split. For Cilium, the plan is to open
>> up support for io_uring in zero-copy mode for regular Kubernetes Pods
>> when Cilium is configured with netkit datapath mode.
> 
>  From what we have learned, mlx supports TCP header/data split starting from CX7, relying on the hw rx gro. I would like to ask, can CX6 use TCP header/data split? Can you share your CX6's mlx driver information and FW information? I will test it. If CX6 can support, this one is even better for me. Thanks.
I'll double check with David, but this is a typo here and needs to say CX7,
the af-xdp work was done on CX6. So we'll correct in v2, thanks (& sorry for
the confusion)!