igc: assign highest TX queue number as highest priority in mqprio

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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.

Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Faizal Rahim <faizal.abdul.rahim@linux.intel.com>
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

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This commit is contained in:

Faizal Rahim 2025-05-19 03:19:08 -04:00 • committed by Tony Nguyen

parent e35ba6d3c6

commit 650a2fe795

2 changed files with 42 additions and 13 deletions

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20

drivers/net/ethernet/intel/igc/igc_main.c

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35

drivers/net/ethernet/intel/igc/igc_tsn.c

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