test_bridge_fdb_stress.sh (1429B)
1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3 4# Bridge FDB entries can be offloaded to DSA switches without holding the 5# rtnl_mutex. Traditionally this mutex has conferred drivers implicit 6# serialization, which means their code paths are not well tested in the 7# presence of concurrency. 8# This test creates a background task that stresses the FDB by adding and 9# deleting an entry many times in a row without the rtnl_mutex held. 10# It then tests the driver resistance to concurrency by calling .ndo_fdb_dump 11# (with rtnl_mutex held) from a foreground task. 12# Since either the FDB dump or the additions/removals can fail, but the 13# additions and removals are performed in deferred as opposed to process 14# context, we cannot simply check for user space error codes. 15 16WAIT_TIME=1 17NUM_NETIFS=1 18REQUIRE_JQ="no" 19REQUIRE_MZ="no" 20NETIF_CREATE="no" 21lib_dir=$(dirname $0)/../../../net/forwarding 22source $lib_dir/lib.sh 23 24cleanup() { 25 echo "Cleaning up" 26 kill $pid && wait $pid &> /dev/null 27 ip link del br0 28 echo "Please check kernel log for errors" 29} 30trap 'cleanup' EXIT 31 32eth=${NETIFS[p1]} 33 34ip link del br0 2&>1 >/dev/null || : 35ip link add br0 type bridge && ip link set $eth master br0 36 37(while :; do 38 bridge fdb add 00:01:02:03:04:05 dev $eth master static 39 bridge fdb del 00:01:02:03:04:05 dev $eth master static 40done) & 41pid=$! 42 43for i in $(seq 1 50); do 44 bridge fdb show > /dev/null 45 sleep 3 46 echo "$((${i} * 2))% complete..." 47done