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#!/bin/sh /etc/rc.common
######################################################################
# vim: set ft=bash
# shellcheck disable=2155,3019,3043,3057,3060
######################################################################
START=93
PROG=smp_affinity
log_msg() {
local irq_name="$1" affinity="$2" irq="$3"
msg="$(printf "Pinning IRQ($irq) %-24s to CPU ${affinity}\n" "$irq_name")"
logger -t "$PROG" "$msg"
}
######################################################################
### Takes a comma, space separated, or range list of CPU numbers and
## returns a bitmask of CPUs.
## cpus_to_bitmask "0,1,2,3" -> f
## cpus_to_bitmask "0 1 2 3" -> f
## cpus_to_bitmask "0-3" -> f
## cpus_to_bitmask "3" -> 8
#######################################################################
cpus_to_bitmask() {
local bitmask=0
# shellcheck disable=2048
for range in ${*//,/ }; do
start="${range%-*}"
end="${range#*-}"
if [ -z "$end" ]; then
bitmask="$((bitmask | 1 << start))"
else
bitmask="$((bitmask | (2 ** (end - start + 1) - 1) << start))"
fi
done
printf '%x' $bitmask
}
######################################################################
### Takes a bitmask of CPUs and returns a space separated list of
## CPU numbers.
## bitmask_to_cpus f -> 0 1 2 3
######################################################################
bitmask_to_cpus() {
[ "${1:0:2}" != "0x" ] && set -- "0x$1"
local bitmask="$(printf '%d' "$1")"
local cpus=""
for i in $(seq 0 63); do
if [ $((bitmask & 1)) -ne 0 ]; then
cpus="$cpus $i"
fi
bitmask=$((bitmask >> 1))
done
echo "${cpus# }"
}
######################################################################
### Sets the affinity of the IRQs with the given name to the given CPU.
## 1st argument: IRQ name ("reo2host-destination-ring1") (req)
## 2nd argument: CPU number (req)
######################################################################
set_affinity() {
local irq_name="$1" affinity="$2" bitmask irq
awk -v irq_name="$1" '$0 ~ irq_name { print substr($1, 1, length($1)-1); exit }' /proc/interrupts \
| while read -r irq; do
$enable_log && {
log_msg "$irq_name" "$affinity" "$irq"
}
bitmask=$(cpus_to_bitmask "$affinity") && echo "$bitmask" > "/proc/irq/$irq/smp_affinity"
done
}
enable_affinity_ipq807x() {
# assign 4 rx interrupts to each core
set_affinity 'reo2host-destination-ring1' 0
set_affinity 'reo2host-destination-ring2' 1
set_affinity 'reo2host-destination-ring3' 2
set_affinity 'reo2host-destination-ring4' 3
# assign 3 tcl completions to last 3 CPUs
set_affinity 'wbm2host-tx-completions-ring1' 1
set_affinity 'wbm2host-tx-completions-ring2' 2
set_affinity 'wbm2host-tx-completions-ring3' 3
# assign 3 ppdu mac interrupts to last 3 cores
set_affinity 'ppdu-end-interrupts-mac1' 1
set_affinity 'ppdu-end-interrupts-mac2' 2
set_affinity 'ppdu-end-interrupts-mac3' 3
# assign 4 lan/wan to core 4
set_affinity 'edma_txcmpl' 3
set_affinity 'edma_rxfill' 3
set_affinity 'edma_rxdesc' 3
set_affinity 'edma_misc' 3
}
boot() {
local enable
config_load smp_affinity
config_get_bool enable "general" enable 1
config_get_bool enable_log "general" enable_log 1
[ "$enable" -eq 1 ] && enable=true || enable=false
[ "$enable_log" -eq 1 ] && enable_log=true || enable_log=false
$enable && enable_affinity_ipq807x
}
|