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enable_service ironic ir-api ir-cond ir-novnc ir-sw-sim
source $DEST/ironic/devstack/common_settings
# Set a default, so we can overwrite it if we need to.
PUBLIC_BRIDGE_MTU=${PUBLIC_BRIDGE_MTU:-1500}
# NOTE(vsaienko) mtu calculation has been changed recently to 1450
# https://github.com/openstack/neutron/commit/51a697
# and caused https://bugs.launchpad.net/ironic/+bug/1631875
# Get the smallest local MTU
local_mtu=$(ip link show | sed -ne 's/.*mtu \([0-9]\+\).*/\1/p' | sort -n | head -1)
# At some point, devstack started pre-populating a public bridge mtu,
# which is fine, but that also got set and used in neutron as the MTU,
# which is fine, but if our MTU is lower, then that can create headaches,
# unless we *need* it lower for specific multinode testing.
# so if the calculated local_mtu *is* higher, then we are wrong, and trust
# a prepopulated variable (1500-40-30=1430 bytes)
if [ $local_mtu -gt $PUBLIC_BRIDGE_MTU ]; then
local_mtu=$PUBLIC_BRIDGE_MTU
fi
# 50 bytes is overhead for vxlan (which is greater than GRE
# allowing us to use either overlay option with this MTU).
# However, if traffic is flowing over IPv6 tunnels, then
# The overhead is essentially another 78 bytes. In order to
# handle both cases, lets go ahead and drop the maximum by
# 78 bytes, while not going below 1280 to make IPv6 work at all.
if [[ "$HOST_TOPOLOGY" == "multinode" ]]; then
# This logic is to artificially pin down the PUBLIC_BRIDGE_MTU for
# when we are using mutlinode architecture, as to transfer the
# bytes over the multinode VXLAN tunnel, we need to drop the mtu.
PUBLIC_BRIDGE_MTU=${OVERRIDE_PUBLIC_BRIDGE_MTU:-$((local_mtu - 78))}
fi
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