netdev - Re: net-shapers plan

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Message-ID: <20250328051350.5055efe9@kernel.org>
Date: Fri, 28 Mar 2025 05:13:50 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Cosmin Ratiu <cratiu@...dia.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "horms@...nel.org"
 <horms@...nel.org>, "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>,
 "davem@...emloft.net" <davem@...emloft.net>, Tariq Toukan
 <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>, "jiri@...nulli.us"
 <jiri@...nulli.us>, Leon Romanovsky <leonro@...dia.com>,
 "edumazet@...gle.com" <edumazet@...gle.com>, Saeed Mahameed
 <saeedm@...dia.com>, Carolina Jubran <cjubran@...dia.com>,
 "pabeni@...hat.com" <pabeni@...hat.com>
Subject: Re: net-shapers plan

On Thu, 6 Mar 2025 14:03:54 +0000 Cosmin Ratiu wrote:
> It is not important which entity (kernel or hw) classifies packets as
> long as the condition that a given txq only sends traffic for a single
> traffic class holds.

> Furthermore, this cannot be done by simply grouping txqs for a given TC
> with NET_SHAPER_SCOPE_NODE, because the TC for a txq is not always
> known to the kernel and might only be known to the driver or the NIC.
> With the new roots, net-shapers can relay the intent to shape traffic
> for a particular TC to the driver without having knowledge of which
> txqs service a TC. The association between txqs and TCs they service
> doesn't need to be known to the kernel.

As mentioned in Zagreb the part of HW reclassifying traffic does not
make sense to me. Is this a real user scenario you have or more of 
an attempt to "maximize flexibility"?