#!/bin/bash

# How to start this test.
# On the initiator system, run:
# ~bart/bin/reload-srp-initiator
# /etc/init.d/srpd start
# mkfs.ext4 -O ^has_journal /dev/sdb
# /etc/init.d/multipathd start
# umount /mnt; mount /dev/dm-0 /mnt && rm -f /mnt/test* && ~bart/bin/fio-stress-test-6 /mnt 16
# On the target system, run:
# initiator=antec ~bart/software/tools/toggle-ib-port-loop

function port_guid() {
    local gid guid

    gid="$(</sys/class/infiniband/mlx4_0/ports/$1/gids/0)" || return $?
    guid="${gid#fe80:0000:0000:0000}"
    echo "0x${guid//:/}"
}

if [ -z "${initiator}" ]; then
    echo "Error: variable \${initiator} has not been set"
    exit 1
fi

guid1="$(port_guid 1)"
guid2="$(port_guid 2)"

set -x

/etc/init.d/srpd stop
while true; do
    ssh ${initiator} ibportstate -G "$guid1" 1 disable
    ssh ${initiator} ibportstate -G "$guid2" 2 disable
    sleep $((RANDOM*150/32767))
    /etc/init.d/scst stop
    /etc/init.d/opensmd stop
    /etc/init.d/openibd stop
    for m in mlx4_en mlx4_ib mlx4_core; do
	modprobe -r $m
    done
    /etc/init.d/openibd start
    /etc/init.d/opensmd start
    umount /dev/sr1
    ibstat |
        sed -n 's/^[[:blank:]]*Port GUID: 0x\(..\)\(..\)\(..\)....\(..\)\(..\)\(..\)/00:\2:\3:\4:\5:\6/p' |
        while read a; do
	    p="$(cd /sys/class/net && grep -lw $a */address)"
	    if [ -n "$p" ]; then
	        ifup "$(dirname $p)"
	    fi
	done
    /etc/init.d/scst restart
    sleep $((30 + RANDOM*30/32767))
done