1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3 4# Setup script for running ksft tests over a real interface in loopback mode. 5# This scripts replaces the historical setup_loopback.sh. It puts 6# a (presumably) real hardware interface into loopback mode, creates macvlan 7# interfaces on top and places them in a network namespace for isolation. 8# 9# NETIF env variable must be exported to indicate the real target device. 10# Note that the test will override NETIF with one of the macvlans, the 11# actual ksft test will only see the macvlans. 12# 13# Example use: 14# export NETIF=eth0 15# ./net/lib/ksft_setup_loopback.sh ./drivers/net/gro.py 16 17if [ -z "$NETIF" ]; then 18 echo "Error: NETIF variable not set" 19 exit 1 20fi 21if ! [ -d "/sys/class/net/$NETIF" ]; then 22 echo "Error: Can't find $NETIF, invalid netdevice" 23 exit 1 24fi 25 26# Save original settings for cleanup 27readonly FLUSH_PATH="/sys/class/net/${NETIF}/gro_flush_timeout" 28readonly IRQ_PATH="/sys/class/net/${NETIF}/napi_defer_hard_irqs" 29FLUSH_TIMEOUT="$(< "${FLUSH_PATH}")" 30readonly FLUSH_TIMEOUT 31HARD_IRQS="$(< "${IRQ_PATH}")" 32readonly HARD_IRQS 33 34SERVER_NS=$(mktemp -u server-XXXXXXXX) 35readonly SERVER_NS 36CLIENT_NS=$(mktemp -u client-XXXXXXXX) 37readonly CLIENT_NS 38readonly SERVER_MAC="aa:00:00:00:00:02" 39readonly CLIENT_MAC="aa:00:00:00:00:01" 40 41# ksft expects addresses to communicate with remote 42export LOCAL_V6=2001:db8:1::1 43export REMOTE_V6=2001:db8:1::2 44 45cleanup() { 46 local exit_code=$? 47 48 echo "Cleaning up..." 49 50 # Remove macvlan interfaces and namespaces 51 ip -netns "${SERVER_NS}" link del dev server 2>/dev/null || true 52 ip netns del "${SERVER_NS}" 2>/dev/null || true 53 ip -netns "${CLIENT_NS}" link del dev client 2>/dev/null || true 54 ip netns del "${CLIENT_NS}" 2>/dev/null || true 55 56 # Disable loopback 57 ethtool -K "${NETIF}" loopback off 2>/dev/null || true 58 sleep 1 59 60 echo "${FLUSH_TIMEOUT}" >"${FLUSH_PATH}" 61 echo "${HARD_IRQS}" >"${IRQ_PATH}" 62 63 exit $exit_code 64} 65 66trap cleanup EXIT INT TERM 67 68# Enable loopback mode 69echo "Enabling loopback on ${NETIF}..." 70ethtool -K "${NETIF}" loopback on || { 71 echo "Failed to enable loopback mode" 72 exit 1 73} 74# The interface may need time to get carrier back, but selftests 75# will wait for carrier, so no need to wait / sleep here. 76 77# Use timer on host to trigger the network stack 78# Also disable device interrupt to not depend on NIC interrupt 79# Reduce test flakiness caused by unexpected interrupts 80echo 100000 >"${FLUSH_PATH}" 81echo 50 >"${IRQ_PATH}" 82 83# Create server namespace with macvlan 84ip netns add "${SERVER_NS}" 85ip link add link "${NETIF}" dev server address "${SERVER_MAC}" type macvlan 86ip link set dev server netns "${SERVER_NS}" 87ip -netns "${SERVER_NS}" link set dev server up 88ip -netns "${SERVER_NS}" addr add $LOCAL_V6/64 dev server 89ip -netns "${SERVER_NS}" link set dev lo up 90 91# Create client namespace with macvlan 92ip netns add "${CLIENT_NS}" 93ip link add link "${NETIF}" dev client address "${CLIENT_MAC}" type macvlan 94ip link set dev client netns "${CLIENT_NS}" 95ip -netns "${CLIENT_NS}" link set dev client up 96ip -netns "${CLIENT_NS}" addr add $REMOTE_V6/64 dev client 97ip -netns "${CLIENT_NS}" link set dev lo up 98 99echo "Setup complete!" 100echo " Device: ${NETIF}" 101echo " Server NS: ${SERVER_NS}" 102echo " Client NS: ${CLIENT_NS}" 103echo "" 104 105# Setup environment variables for tests 106export NETIF=server 107export REMOTE_TYPE=netns 108export REMOTE_ARGS="${CLIENT_NS}" 109 110# Run the command 111ip netns exec "${SERVER_NS}" "$@" 112