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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
set -e
NSIM_LRO_ID=$((256 + RANDOM % 256))
NSIM_LRO_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_LRO_ID
NSIM_DEV_SYS_NEW=/sys/bus/netdevsim/new_device
NSIM_DEV_SYS_DEL=/sys/bus/netdevsim/del_device
cleanup()
{
set +e
ip link del dummyteam &>/dev/null
ip link del team0 &>/dev/null
echo $NSIM_LRO_ID > $NSIM_DEV_SYS_DEL
modprobe -r netdevsim
}
# Trigger LRO propagation to the lower.
# https://lore.kernel.org/netdev/aBvOpkIoxcr9PfDg@mini-arch/
team_lro()
{
# using netdevsim because it supports NETIF_F_LRO
NSIM_LRO_NAME=$(find $NSIM_LRO_SYS/net -maxdepth 1 -type d ! \
-path $NSIM_LRO_SYS/net -exec basename {} \;)
ip link add name team0 type team
ip link set $NSIM_LRO_NAME down
ip link set dev $NSIM_LRO_NAME master team0
ip link set team0 up
ethtool -K team0 large-receive-offload off
ip link del team0
}
# Trigger promisc propagation to the lower during IFLA_MASTER.
# https://lore.kernel.org/netdev/20250506032328.3003050-1-sdf@fomichev.me/
team_promisc()
{
ip link add name dummyteam type dummy
ip link add name team0 type team
ip link set dummyteam down
ip link set team0 promisc on
ip link set dev dummyteam master team0
ip link set team0 up
ip link del team0
ip link del dummyteam
}
# Trigger promisc propagation to the lower via netif_change_flags (aka
# ndo_change_rx_flags).
# https://lore.kernel.org/netdev/20250514220319.3505158-1-stfomichev@gmail.com/
team_change_flags()
{
ip link add name dummyteam type dummy
ip link add name team0 type team
ip link set dummyteam down
ip link set dev dummyteam master team0
ip link set team0 up
ip link set team0 promisc on
# Make sure we can add more L2 addresses without any issues.
ip link add link team0 address 00:00:00:00:00:01 team0.1 type macvlan
ip link set team0.1 up
ip link del team0.1
ip link del team0
ip link del dummyteam
}
trap cleanup EXIT
modprobe netdevsim || :
echo $NSIM_LRO_ID > $NSIM_DEV_SYS_NEW
udevadm settle
team_lro
team_promisc
team_change_flags
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