netdev - Re: [RFC PATCH v2 00/21] netgpu: networking between NIC and GPU/CPU.

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Date:   Tue, 28 Jul 2020 12:55:13 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     <netdev@...r.kernel.org>, <kernel-team@...com>
Subject: Re: [RFC PATCH v2 00/21] netgpu: networking between NIC and
 GPU/CPU.

On Mon, 27 Jul 2020 15:44:23 -0700
Jonathan Lemon <jonathan.lemon@...il.com> wrote:

> Current limitations:
>   - mlx5 only, header splitting is at a fixed offset.
>   - currently only TCP protocol delivery is performed.
>   - TX completion notification is planned, but not in this patchset.
>   - not compatible with xsk (re-uses same datastructures)
>   - not compatible with bpf payload inspection

This a good summary of why TCP Offload is not a mainstream solution.
Look back in archives and you will find lots of presentations about
why TOE sucks.

You also forgot no VRF, no namespaes, no firewall, no containers, no encapsulation.
It acts as proof that if you cut out everything you can build something faster.
But not suitable for upstream or production.