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#!/bin/bash
# Author: Robert E. Gilligan <gilligan@vyatta.com>
# Date: 2008
# Description: CLI back-end script to manipulate NIC interrupt CPU affinity.
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2006, 2007, 2008 Vyatta, Inc.
# All Rights Reserved.
# **** End License ****
# Provides sub-commands to:
# - Check the validity of an interface name and affinity mask value
# - Set the affinity mask to the IRQ being used by an interface
# - Reset the affinity mask of the IRQ being used by an interface to the
# system default value of all-ones.
# - Print the affinity mask of the IRQ being used by an interface
#
# Max number of hex characters in an IRQ affinity mask. Support up to 16 CPUs.
MAX_MASK=4
# Set up some global values...
numcpus=`grep -c -e "^processor" /proc/cpuinfo`
declare -i maxmask=(2**numcpus)
let maxmask=maxmask-1
maxmaskhex=`printf "%x" ${maxmask}`
print_usage()
{
echo "Usage:"
echo -e "\t$0 check <ifname> <mask>"
echo -e "\t$0 set <ifname> <mask>"
echo -e "\t$0 reset <ifname>"
echo -e "\t$0 print <ifname>"
}
get_irqnum()
{
irqnum=`cat /sys/class/net/$1/device/irq`
if [ -z "$irqnum" ]; then
echo "Invalid interface name: $1"
return 1
fi
return 0
}
get_mask()
{
mask=$1
# mask must be a short hex value
if [ ${#mask} -gt $MAX_MASK ]; then
echo "mask too long: ${#2} characters."
return 1
fi
# strip out all the hex digits
exmask=`echo $mask | sed -e s/[0-9a-fA-F]//g`
# if anything is left, its not hex
if [ ! -z "$exmask" ]; then
echo "Invalid characters in hex mask: $exmask"
return 1
fi
declare -i intmask=0x${mask}
# Make sure that mask holds at least one bit, and holds no more bits
# than we have CPUs.
if [ ${intmask} -eq 0 ]; then
echo "Mask can not be 0."
return 1
fi
if [ $intmask -gt $maxmask ]; then
echo "Mask is too large. Maximum hexidecimal bitmask is: ${maxmaskhex}"
return 1
fi
return 0
}
#
# Don't waste our time with uniprocessor machines
#
check_uniproc()
{
if [ $maxmask -eq 1 ]; then
echo "This machine has only 1 CPU."
echo "Can only set SMP affinity on multi-processor machines"
return 1;
fi
return 0
}
case "$1" in
check)
if [ $# -ne 3 ]; then
print_usage
exit 1
fi
if ! check_uniproc ; then
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
if ! get_mask $3 ; then
exit 1
fi
exit 0
;;
set)
if [ $# -ne 3 ]; then
print_usage
exit 1
fi
if ! check_uniproc ; then
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
if ! get_mask $3 ; then
exit 1
fi
echo $mask > /proc/irq/$irqnum/smp_affinity
if [ $? -ne 0 ]; then
echo "Couldn't assign smp_affinity. Exit status: $?"
exit 1
fi
;;
reset)
if [ $# -ne 2 ]; then
print_usage
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
echo $maxmaskhex > /proc/irq/$irqnum/smp_affinity
if [ $? -ne 0 ]; then
echo "Couldn't assign smp_affinity. Exit status: $?"
exit 1
fi
;;
print)
if [ $# -ne 2 ]; then
print_usage
exit 1
fi
if ! get_irqnum $2 ; then
exit 1
fi
mask=`cat /proc/irq/$irqnum/smp_affinity`
if [ -z $mask ]; then
echo "Couldn't get smp_affinity for interface $2, irq $irqnum"
exit 1
fi
echo "Interface $2 is using IRQ: $irqnum"
echo "SMP affinity mask for IRQ $irqnum is: $mask"
;;
*)
print_usage
exit 1
;;
esac
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