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Configure midplane interface in multi-asic namespaces on a chassis #8583

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Oct 27, 2021
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Configure midplane interface in multi-asic namespaces on a chassis #8583

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42 changes: 42 additions & 0 deletions files/image_config/interfaces/interfaces-config.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,48 @@ for intf_pid in $(ls -1 /var/run/dhclient*.Ethernet*.pid 2> /dev/null); do
[ -f ${intf_pid} ] && kill `cat ${intf_pid}` && rm -f ${intf_pid}
done


# Setup eth1 if we connect to a remote chassis DB.
PLATFORM=${PLATFORM:-`sonic-cfggen -H -v DEVICE_METADATA.localhost.platform`}
CHASSISDB_CONF="/usr/share/sonic/device/$PLATFORM/chassisdb.conf"
[ -f $CHASSISDB_CONF ] && source $CHASSISDB_CONF

ASIC_CONF="/usr/share/sonic/device/$PLATFORM/asic.conf"
[ -f $ASIC_CONF ] && source $ASIC_CONF

if [[ -n "$midplane_subnet" && ($NUM_ASIC -gt 1) ]]; then
for asic_id in `seq 0 $((NUM_ASIC - 1))`; do
NET_NS="asic$asic_id"

PIDS=`ip netns pids "$NET_NS" 2>/dev/null`
if [ "$?" -ne "0" ]; then # namespace doesn't exist
continue
fi

# Use /16 for loopback interface
ip netns exec $NET_NS ip addr add 127.0.0.1/16 dev lo
ip netns exec $NET_NS ip addr del 127.0.0.1/8 dev lo

# Create eth1 in database instance
ip link add name ns-eth1 link eth1-midplane type ipvlan mode l2
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ip link set dev ns-eth1 netns $NET_NS
ip netns exec $NET_NS ip link set ns-eth1 name eth1

# Configure IP address and enable eth1
lc_slot_id=$(python3 -c 'import sonic_platform.platform; platform_chassis = sonic_platform.platform.Platform().get_chassis(); print(platform_chassis.get_my_slot())' 2>/dev/null)
lc_ip_address=`echo $midplane_subnet | awk -F. '{print $1 "." $2}'`.$lc_slot_id.$((asic_id + 10))
lc_subnet_mask=${midplane_subnet#*/}
ip netns exec $NET_NS ip addr add $lc_ip_address/$lc_subnet_mask dev eth1
ip netns exec $NET_NS ip link set dev eth1 up

# Allow localnet routing on the new interfaces if midplane is using a
# subnet in the 127/8 range.
if [[ "${midplane_subnet#127}" != "$midplane_subnet" ]]; then
ip netns exec $NET_NS bash -c "echo 1 > /proc/sys/net/ipv4/conf/eth1/route_localnet"
fi
done
fi

# Read sysctl conf files again
sysctl -p /etc/sysctl.d/90-dhcp6-systcl.conf

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