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#!/bin/bash

NUM=0
CPUS=
for ARG in "$@"
do
        if [ $NUM -eq 0 ]; then INTERFACE=$ARG; fi
        if [ $NUM -gt 0 ]; then CPUS[$[$NUM-1]]=$ARG; fi
        let NUM++
done

if [ "$INTERFACE" != "" ] && [ "${CPUS[0]}" -ge 0 ]
then
        CPU_INDEX=0
        for irq in `cat /proc/interrupts | grep $INTERFACE | awk '{print $1}' | sed s/\://g`
        do
                f="/proc/irq/$irq/smp_affinity"
                test -r "$f" || continue
                if [ "${CPUS[$CPU_INDEX]}" != "" ] && [ ${CPUS[$CPU_INDEX]} -ge 0 ]
                then
                        MASK=`printf %x $[2 ** ${CPUS[$CPU_INDEX]}]`
                        printf "Assign SMP affinity: %-5s  IRQ: %-2d  CPU: %2d  MASK: 0x%s\n" $INTERFACE $irq ${CPUS[$CPU_INDEX]} $MASK
                        echo "$MASK" > "$f"
                fi
                let CPU_INDEX++
        done
else
        echo "Usage  : $0 <INTERFACE> <CPU_LIST>"
        echo "Example: $0 eth0 0 1 2 3"
fi