set_irq_affinity.sh

#!/bin/bash
#
# Copyright (c) 2015, Intel Corporation
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#     * Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above copyright
#       notice, this list of conditions and the following disclaimer in the
#       documentation and/or other materials provided with the distribution.
#     * Neither the name of Intel Corporation nor the names of its contributors
#       may be used to endorse or promote products derived from this software
#       without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Affinitize interrupts to cores
#
# typical usage is (as root):
# set_irq_affinity -x local eth1 <eth2> <eth3>
#
# to get help:
# set_irq_affinity

usage()
{
	echo
	echo "Usage: $0 [-x|-X] {all|local|remote|one|custom} [ethX] <[ethY]>"
	echo "	options: -x		Configure XPS as well as smp_affinity"
	echo "	options: -X		Disable XPS but set smp_affinity"
	echo "	options: {remote|one} can be followed by a specific node number"
	echo "	Ex: $0 local eth0"
	echo "	Ex: $0 remote 1 eth0"
	echo "	Ex: $0 custom eth0 eth1"
	echo "	Ex: $0 0-7,16-23 eth0"
	echo
	exit 1
}

usageX()
{
	echo "options -x and -X cannot both be specified, pick one"
	exit 1
}

if [ "$1" == "-x" ]; then
	XPS_ENA=1
	shift
fi

if [ "$1" == "-X" ]; then
	if [ -n "$XPS_ENA" ]; then
		usageX
	fi
	XPS_DIS=2
	shift
fi

if [ "$1" == -x ]; then
	usageX
fi

if [ -n "$XPS_ENA" ] && [ -n "$XPS_DIS" ]; then
	usageX
fi

if [ -z "$XPS_ENA" ]; then
	XPS_ENA=$XPS_DIS
fi

num='^[0-9]+$'
# Vars
AFF=$1
shift

case "$AFF" in
    remote)	[[ $1 =~ $num ]] && rnode=$1 && shift ;;
    one)	[[ $1 =~ $num ]] && cnt=$1 && shift ;;
    all)	;;
    local)	;;
    custom)	;;
    [0-9]*)	;;
    -h|--help)	usage ;;
    "")		usage ;;
    *)		IFACES=$AFF && AFF=all ;;	# Backwards compat mode
esac

# append the interfaces listed to the string with spaces
while [ "$#" -ne "0" ] ; do
	IFACES+=" $1"
	shift
done

# for now the user must specify interfaces
if [ -z "$IFACES" ]; then
	usage
	exit 1
fi

# support functions

set_affinity()
{
	VEC=$core
	if [ $VEC -ge 32 ]
	then
		MASK_FILL=""
		MASK_ZERO="00000000"
		let "IDX = $VEC / 32"
		for ((i=1; i<=$IDX;i++))
		do
			MASK_FILL="${MASK_FILL},${MASK_ZERO}"
		done

		let "VEC -= 32 * $IDX"
		MASK_TMP=$((1<<$VEC))
		MASK=$(printf "%X%s" $MASK_TMP $MASK_FILL)
	else
		MASK_TMP=$((1<<$VEC))
		MASK=$(printf "%X" $MASK_TMP)
	fi

	printf "%s" $MASK > /proc/irq/$IRQ/smp_affinity
	printf "%s %d %s -> /proc/irq/$IRQ/smp_affinity\n" $IFACE $core $MASK
	case "$XPS_ENA" in
	1)
		printf "%s %d %s -> /sys/class/net/%s/queues/tx-%d/xps_cpus\n" $IFACE $core $MASK $IFACE $((n-1))
		printf "%s" $MASK > /sys/class/net/$IFACE/queues/tx-$((n-1))/xps_cpus
	;;
	2)
		MASK=0
		printf "%s %d %s -> /sys/class/net/%s/queues/tx-%d/xps_cpus\n" $IFACE $core $MASK $IFACE $((n-1))
		printf "%s" $MASK > /sys/class/net/$IFACE/queues/tx-$((n-1))/xps_cpus
	;;
	*)
	esac
}

# Allow usage of , or -
#
parse_range () {
        RANGE=${@//,/ }
        RANGE=${RANGE//-/..}
        LIST=""
        for r in $RANGE; do
		# eval lets us use vars in {#..#} range
                [[ $r =~ '..' ]] && r="$(eval echo {$r})"
		LIST+=" $r"
        done
	echo $LIST
}

# Affinitize interrupts
#
setaff()
{
	CORES=$(parse_range $CORES)
	ncores=$(echo $CORES | wc -w)
	n=1

	# this script only supports interrupt vectors in pairs,
	# modification would be required to support a single Tx or Rx queue
	# per interrupt vector

	queues="${IFACE}-.*TxRx"

	irqs=$(grep "$queues" /proc/interrupts | cut -f1 -d:)
	[ -z "$irqs" ] && irqs=$(grep $IFACE /proc/interrupts | cut -f1 -d:)
	[ -z "$irqs" ] && irqs=$(for i in `ls -Ux /sys/class/net/$IFACE/device/msi_irqs` ;\
	                         do grep "$i:.*TxRx" /proc/interrupts | grep -v fdir | cut -f 1 -d : ;\
	                         done)
	[ -z "$irqs" ] && echo "Error: Could not find interrupts for $IFACE"

	echo "IFACE CORE MASK -> FILE"
	echo "======================="
	for IRQ in $irqs; do
		[ "$n" -gt "$ncores" ] && n=1
		j=1
		# much faster than calling cut for each
		for i in $CORES; do
			[ $((j++)) -ge $n ] && break
		done
		core=$i
		set_affinity
		((n++))
	done
}

# now the actual useful bits of code

# these next 2 lines would allow script to auto-determine interfaces
#[ -z "$IFACES" ] && IFACES=$(ls /sys/class/net)
#[ -z "$IFACES" ] && echo "Error: No interfaces up" && exit 1

# echo IFACES is $IFACES

CORES=$(</sys/devices/system/cpu/online)
[ "$CORES" ] || CORES=$(grep ^proc /proc/cpuinfo | cut -f2 -d:)

# Core list for each node from sysfs
node_dir=/sys/devices/system/node
for i in $(ls -d $node_dir/node*); do
	i=${i/*node/}
	corelist[$i]=$(<$node_dir/node${i}/cpulist)
done

for IFACE in $IFACES; do
	# echo $IFACE being modified

	dev_dir=/sys/class/net/$IFACE/device
	[ -e $dev_dir/numa_node ] && node=$(<$dev_dir/numa_node)
	[ "$node" ] && [ "$node" -gt 0 ] || node=0

	case "$AFF" in
	local)
		CORES=${corelist[$node]}
	;;
	remote)
		[ "$rnode" ] || { [ $node -eq 0 ] && rnode=1 || rnode=0; }
		CORES=${corelist[$rnode]}
	;;
	one)
		[ -n "$cnt" ] || cnt=0
		CORES=$cnt
	;;
	all)
		CORES=$CORES
	;;
	custom)
		echo -n "Input cores for $IFACE (ex. 0-7,15-23): "
		read CORES
	;;
	[0-9]*)
		CORES=$AFF
	;;
	*)
		usage
		exit 1
	;;
	esac

	# call the worker function
	setaff
done

# check for irqbalance running
IRQBALANCE_ON=`ps ax | grep -v grep | grep -q irqbalance; echo $?`
if [ "$IRQBALANCE_ON" == "0" ] ; then
	echo " WARNING: irqbalance is running and will"
	echo "          likely override this script's affinitization."
	echo "          Please stop the irqbalance service and/or execute"
	echo "          'killall irqbalance'"
fi

How to persistently set the specific CPU for the Network Adaptor's (the values should be across the reboot) ?

We have been trying by custom systemd script to keep the configuration persistent across the reboot. custom service running perfect. Even it is executing the above script perfectly. But still the node throws wrong CPU set's.

We have added the following lines in our systemd script.

/etc/sriov/set_irq_affinity -x 0,1,32,33 sriov0 /etc/sriov/set_irq_affinity -x 0,1,32,33 sriov1 /etc/sriov/set_irq_affinity -x 0,1,32,33 sriov2 /etc/sriov/set_irq_affinity -x 0,1,32,33 sriov3

Systemd script :

`[Unit]
Description=Sriov Config Service
After=systemd-udevd.service
#Before=kubelet.service

[Service]
#Type=oneshot
ExecStart=/etc/sriov/setup_dpdk_nic.sh
StartLimitInterval=120
StartLimitBurst=3
LimitCORE=infinity
TimeoutStopSec=90

[Install]
WantedBy=multi-user.target`