netdev - Re: [PATCH iwl-net v2] ice: Add support for devlink loopback param.

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Date: Tue, 28 May 2024 13:40:46 +0200
From: Mateusz Polchlopek <mateusz.polchlopek@...el.com>
To: Wojciech Drewek <wojciech.drewek@...el.com>, <netdev@...r.kernel.org>
CC: <intel-wired-lan@...ts.osuosl.org>, <jiri@...nulli.us>
Subject: Re: [PATCH iwl-net v2] ice: Add support for devlink loopback param.



On 5/28/2024 1:01 PM, Wojciech Drewek wrote:
> From: Pawel Kaminski <pawel.kaminski@...el.com>
> 
> Add support for driver-specific devlink loopback param. Supported values
> are "enabled", "disabled" and "prioritized". Default configuration is
> set to "enabled".
> 
> Add documentation in networking/devlink/ice.rst.
> 
> In previous generations of Intel NICs the trasmit scheduler was only

Typo: trasmit

> limited by PCIe bandwidth when scheduling/assigning hairpin-badwidth
> between VFs. Changes to E810 HW design introduced scheduler limitation,
> so that available hairpin-bandwidth is bound to external port speed.
> In order to address this limitation and enable NFV services such as
> "service chaining" a knob to adjust the scheduler config was created.
> Driver can send a configuration message to the FW over admin queue and
> internal FW logic will reconfigure HW to prioritize and add more BW to
> VF to VF traffic. As end result for example 10G port will no longer limit
> hairpin-badwith to 10G and much higher speeds can be achieved.

<snip>