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board/common: Use mqprio on supported interfaces

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Opportunistically look for interfaces with multiple transmit queues
and hardware support for the mqprio queuing discipline. For every
matching interface, set up mappings from kernel-internal packet
priorities, via traffic classes, to transmit queues such that as many
high priorities as possible are scheduled on separate queues.
This commit is contained in:
Tobias Waldekranz
2024-06-07 10:10:38 +02:00
parent a5d98e9351
commit e358e6bc1f
1 changed files with 52 additions and 0 deletions
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board/common/rootfs/libexec/infix/init.d/25-mqprio
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#!/bin/sh
# Opportunistically look for interfaces with multiple transmit queues
# and hardware support for the mqprio queuing discipline. For every
# matching interface, set up mappings from kernel-internal packet
# priorities, via traffic classes, to transmit queues such that as
# many high priorities as possible are scheduled on separate queues.
set -e
map()
{
case "$1" in
2)
echo "map 0 0 0 0 0 0 1 1";;
3)
echo "map 0 0 0 0 1 1 2 2";;
4)
echo "map 0 0 1 1 2 2 3 3";;
5)
echo "map 0 0 1 1 2 2 3 4";;
6)
echo "map 0 0 1 1 2 3 4 5";;
7)
echo "map 0 0 1 2 3 4 5 6";;
8)
echo "map 0 1 2 3 4 5 6 7";;
esac
}
queues()
{
out="queues "
for tc in $(seq 0 $(($1 - 1))); do
out="$out 1@$tc"
done
echo "$out"
}
set $(ip -j -d link show | jq -r '.[] | .ifname, .num_tx_queues')
while [ "$1" ]; do
iface="$1"
txqs="$2"
shift 2
[ $txqs -lt 2 ] && continue
[ $txqs -gt 8 ] && txqs=8
tc qdisc add dev $iface root mqprio hw 1 \
num_tc $txqs $(map $txqs) $(queues $txqs) || true
done