Re: [PATCH iwl-next v2 4/8] igc: assign highest TX queue number as highest priority in mqprio

[Simon Horman]

On Wed, May 14, 2025 at 12:29:41AM -0400, Faizal Rahim wrote:
> Previously, TX arbitration prioritized queues based on the TC they were
> mapped to. A queue mapped to TC 3 had higher priority than one mapped to
> TC 0.
> 
> To improve code reuse for upcoming patches and align with typical NIC
> behavior, this patch updates the logic to prioritize higher queue numbers
> when mqprio is used. As a result, queue 0 becomes the lowest priority and
> queue 3 becomes the highest.
> 
> This patch also introduces igc_tsn_is_tc_to_queue_priority_ordered() to
> preserve the original TC-based priority rule and reject configurations
> where a higher TC maps to a lower queue offset.
> 
> Signed-off-by: Faizal Rahim <faizal.abdul.rahim@xxxxxxxxxxxxxxx>

Reviewed-by: Simon Horman <horms@xxxxxxxxxx>