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#!/bin/sh
#
# iscsi_offload
#
# Configure iSCSI offload engines for use with open-iscsi
# Usage:
# iscsi_offload [-d | -f | -i <ipaddr> | -t ] <nic>
#
# Copyright (c) 2011 Hannes Reinecke, SUSE Labs
# This script is licensed under the GPL.
#
# The script creates an open-iscsi interface definition
# in the style <nic>-<module>, where <nic> matches the
# network interface passed on the commandline.
# If '-t' (test mode) is passed as an option, the script
# will not create nor modify any setting but just print
# the currently active ones.
#
# Currently the script works with Broadcom (bnx2i) and
# Chelsio T3 (cxgbi) iSCSI offload engines.
# Should work with Chelsio T4, but has not been tested.
# ServerEngines (be2iscsi) and QLogic (qla4xxx) can only
# be configured via BIOS, open-iscsi support is still in
# development.
#
#
# Return codes:
# 0: Success
# 1: Invalid command line parameter
# 2: iSCSI offloading not supported
# 3: Error during module loading
# 4: Cannot configure interface via iscsiadm, use BIOS setup
# 5: internal error running iscsiadm
#
# Output:
# <mac> [none|dhcp|ip <ipaddr>|ibft]
# where
# <mac>: MAC Address of the iSCSI offload engine
# none: No IP configuration set for the iSCSI offload engine
# dhcp: iSCSI offload engine configured for DHCP
# ip: iSCSI offload engine configured with static IP address <ipaddr>
# ibft: iSCSI offload engine configured from iBFT values
#
#
# Figure out the MAC address of the iSCSI offload engine
# corresponding to a NIC from a given PCI device.
# bnx2 is using one PCI device per port for both network and iSCSI offloading
# cxgb3 is using one PCI device for everything.
#
iscsi_macaddress_from_pcidevice()
{
local path=$1
local if=$2
local h
local host
for h in $path/host* ; do
if [ -d "$h" ] ; then
host=${h##*/}
read netdev < /sys/class/iscsi_host/$host/netdev
if [ "$netdev" = "$IFNAME" ] ; then
read mac < /sys/class/iscsi_host/$host/hwaddress
if [ "$mac" != "00:00:00:00:00:00" ] ; then
echo "$mac"
fi
break;
fi
fi
done
}
#
# Figure out the MAC address of the iSCSI offload engine
# corresponding to a NIC from a given PCI function.
# It is assumed that the MAC address of the iSCSI offload
# engine is equal of the MAC address of the NIC plus one.
# Suitable for be2iscsi and qla4xxx
#
iscsi_macaddress_from_pcifn()
{
local path=$1
local if=$2
local h
local host
local ifmac
ifmac=$(ip addr show dev $if | sed -n 's/ *link\/ether \(.*\) brd.*/\1/p')
m5=$(( 0x${ifmac##*:} ))
m5=$(( $m5 + 1 ))
ifmac=$(printf "%s:%02x" ${ifmac%:*} $m5)
for host in /sys/class/iscsi_host/host* ; do
if [ -L "$host" ] ; then
read mac < $host/hwaddress
if [ "$mac" = "$ifmac" ] ; then
echo "$mac"
break;
fi
fi
done
}
update_iface_setting() {
local iface="$1"
local name="$2"
local value="$3"
iface_value=$(iscsiadm -m iface -I $iface | sed -n "s/$name = \(.*\)/\1/p")
if [ "$iface_value" = "<empty>" ] ; then
iface_value=
fi
if [ "$iface_value" != "$value" ] ; then
if ! iscsiadm -m iface -I $iface -o update -n "$name" -v "$value" ; then
return 1
fi
fi
return 0
}
while getopts di:t options ; do
case $options in
d ) mode=dhcp;;
i ) mode=static
optaddr=$OPTARG
;;
f ) mode=firmware;;
t ) dry_run=1;;
?) printf "Usage: %s [-d|-t|-i ipaddr|-f] ifname\n" $0
exit 1;;
esac
done
shift $(($OPTIND - 1))
IFNAME=$1
ibft_mode="none"
if [ -z "$IFNAME" ] ; then
echo "No interface specified"
exit 1
fi
if [ "$dry_run" ] ; then
if [ "$mode" = "dhcp" ] ; then
echo "'-t' specified, ignoring '-d'"
mode=
elif [ "$mode" = "static" ] ; then
echo "'-t' specified, ignoring '-s'"
mode=
fi
fi
if [ ! -L /sys/class/net/$IFNAME ] ; then
echo "Interface $IFNAME not found"
exit 1
fi
if [ "$optaddr" ] && ! ip route get $optaddr ; then
echo "Invalid IP address $optaddr"
exit 1
fi
if [ "$dry_run" ] ; then
mode=
fi
ifpath=$(cd -P /sys/class/net/$IFNAME; echo $PWD)
pcipath=$(cd -P $ifpath/device; echo $PWD)
if [ -d $pcipath ] ; then
drvlink=$(readlink $pcipath/driver)
driver=${drvlink##*/}
fi
if [ -z "$driver" ] ; then
echo "No driver found for interface $IFNAME"
exit 1
fi
case "$driver" in
bnx2*)
mod=bnx2i
;;
cxgb*)
mod=cxgb3i
;;
be2*)
mod=be2iscsi
;;
qla*)
mod=qla4xxx
;;
esac
if [ -z "$mod" ] ; then
echo "iSCSI offloading not supported on interface $IFNAME"
exit 2
fi
# Check if the required modules are already loaded
loaded=$(sed -n "/^$mod/p" /proc/modules)
if [ -z "$loaded" ] ; then
modprobe $mod
fi
loaded=$(sed -n "/^$mod/p" /proc/modules)
if [ -z "$loaded" ] ; then
echo "Loading of $mod.ko failed, please check dmesg"
exit 3
fi
# Get the correct MAC address for the various devices
if [ "$mod" = "bnx2i" ] ; then
mac=$(iscsi_macaddress_from_pcidevice $pcipath $IFNAME)
elif [ "$mod" = "cxgb3i" ] ; then
mac=$(iscsi_macaddress_from_pcidevice $pcipath $IFNAME)
elif [ "$mod" = "be2iscsi" ] ; then
mac=$(iscsi_macaddress_from_pcifn $pcipath $IFNAME)
elif [ "$mod" = "qla4xxx" ] ; then
mac=$(iscsi_macaddress_from_pcifn $pcipath $IFNAME)
fi
if [ -z "$mac" ] ; then
echo "iSCSI offloading not supported on interface $IFNAME"
exit 2
fi
gen_iface="$mod.$mac"
ioe_iface="${IFNAME}-${mod}"
# Get existing settings
if iscsiadm -m iface -I $ioe_iface > /dev/null 2>&1 ; then
ioe_mac=$(iscsiadm -m iface -I $ioe_iface 2> /dev/null| sed -n "s/iface\.hwaddress = \(.*\)/\1/p")
ioe_mod=$(iscsiadm -m iface -I $ioe_iface 2> /dev/null| sed -n "s/iface\.transport_name = \(.*\)/\1/p")
ipaddr=$(iscsiadm -m iface -I $ioe_iface 2> /dev/null| sed -n "s/iface\.ipaddress = \(.*\)/\1/p")
if [ "$ipaddr" == "<empty>" ] ; then
ipaddr=
fi
elif [ "$mod" = "be2iscsi" ] ; then
ioe_mac=$mac
ioe_mod=$mod
else
# Create new interface
iscsiadm -m iface -I $ioe_iface --op=new 2> /dev/null
ioe_mac=
ioe_mod=
ipaddr=
fi
if [ -z "$dry_run" ] ; then
if [ "$ioe_mac" != "$mac" ] ; then
if [ -n "$ioe_mac" ] ; then
echo "Warning: Updating MAC address on iface $ioe_iface"
fi
update_iface_setting $ioe_iface iface.hwaddress "$mac"
fi
if [ "$ioe_mod" != "$mod" ] ; then
if [ -n "$ioe_mod" ] ; then
echo "Warning: Update transport on iface $ioe_iface"
fi
update_iface_setting $ioe_iface iface.transport_name "$mod"
fi
elif [ -z "$ipaddr" ] ; then
ipaddr=$(iscsiadm -m iface -I $gen_iface 2> /dev/null| sed -n "s/iface\.ipaddress = \(.*\)/\1/p")
if [ "$ipaddr" = "<empty>" ] ; then
ipaddr=
fi
elif [ "$ioe_mod" != "$mod" ] ; then
echo "Warning: Transport mismatch on iface $ioe_iface: $ioe_mod should be $mod"
fi
# Check iBFT setting
for d in /sys/firmware/* ; do
[ -d $d ] || continue
[ -d $d/ethernet0 ] || continue
iboot_dir=$d
done
if [ -n "$iboot_dir" ] && [ -d "$iboot_dir" ] ; then
for if in ${iboot_dir}/ethernet* ; do
read ibft_mac < $if/mac
[ "$ibft_mac" = "$mac" ] || continue
ibft_origin=0
[ -f ${if}/origin ] && read ibft_origin < $if/origin
if [ "$ibft_origin" -eq 1 ] ; then
ibft_mode="static"
elif [ "$ibft_origin" -eq 3 ] ; then
ibft_mode="dhcp"
fi
[ -f $if/dhcp ] && read ibft_dhcp < $if/dhcp
if [ -n "$ibft_dhcp" -a "$ibft_mode" != "dhcp" ] ; then
ibft_mode=dhcp
fi
if [ "$ibft_mode" = "dhcp" ] ; then
ibft_ipaddr="0.0.0.0"
ibft_gateway=
ibft_mask=
break
fi
[ -f $if/ip-addr ] && read ibft_ipaddr < $if/ip-addr
[ -f $if/gateway ] && read ibft_gateway < $if/gateway
[ -f $if/subnet-mask ] && read ibft_mask < $if/subnet-mask
break
done
fi
if [ -z "$optaddr" ] && [ "$ibft_ipaddr" ] ; then
optaddr=$ibft_ipaddr
fi
# Check if the interface needs to be configured
if [ -z "$mode" ] ; then
if [ "$ibft_mode" != "none" ] ; then
echo "$mac ibft"
mode="ibft"
elif [ -z "$ipaddr" ] ; then
echo "$mac none"
mode="none"
elif [ "$ipaddr" = "0.0.0.0" ] ; then
echo "$mac dhcp"
ipaddr=
mode="dhcp"
else
echo "$mac ip $ipaddr"
mode="static"
fi
[ "$dry_run" ] && exit 0
elif [ "$mode" = "dhcp" ] ; then
if [ "$ipaddr" = "0.0.0.0" ] ; then
echo "$mac dhcp"
exit 0
fi
optaddr="0.0.0.0"
elif [ "$mode" = "static" ] && [ "$ipaddr" = "$optaddr" ] ; then
echo "$mac ip $ipaddr"
exit 0
fi
if [ "$mod" = "be2iscsi" ] ; then
exit 4
fi
if ! update_iface_setting $ioe_iface iface.ipaddress "$optaddr" ; then
echo "Failed to set IP address: $?"
exit 1
fi
if ! update_iface_setting $gen_iface iface.ipaddress "$optaddr" ; then
echo "Failed to set IP address for generic interface: $?"
exit 1
fi
if ! update_iface_setting $ioe_iface iface.gateway "$ibft_gateway" ; then
echo "Failed to set gateway address: $?"
exit 1
fi
if ! update_iface_setting $gen_iface iface.gateway "$ibft_gateway" ; then
echo "Failed to set gateway address for generic interface: $?"
exit 1
fi
if ! update_iface_setting $ioe_iface iface.subnet_mask "$ibft_mask" ; then
echo "Failed to set subnet mask: $?"
exit 1
fi
if ! update_iface_setting $gen_iface iface.subnet_mask "$ibft_mask" ; then
echo "Failed to set subnet mask for generic interface: $?"
exit 1
fi
if [ "$mod" = "qla4xxx" ] ; then
iscsiadm -m iface -H $mac -o applyall
fi
ip link set dev $IFNAME up
exit 0