name : test_bridge_fdb_stress.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # Bridge FDB entries can be offloaded to DSA switches without holding the # rtnl_mutex. Traditionally this mutex has conferred drivers implicit # serialization, which means their code paths are not well tested in the # presence of concurrency. # This test creates a background task that stresses the FDB by adding and # deleting an entry many times in a row without the rtnl_mutex held. # It then tests the driver resistance to concurrency by calling .ndo_fdb_dump # (with rtnl_mutex held) from a foreground task. # Since either the FDB dump or the additions/removals can fail, but the # additions and removals are performed in deferred as opposed to process # context, we cannot simply check for user space error codes. WAIT_TIME=1 NUM_NETIFS=1 REQUIRE_JQ="no" REQUIRE_MZ="no" NETIF_CREATE="no" lib_dir=$(dirname "$0") source "$lib_dir"/lib.sh cleanup() { echo "Cleaning up" kill $pid && wait $pid &> /dev/null ip link del br0 echo "Please check kernel log for errors" } trap 'cleanup' EXIT eth=${NETIFS[p1]} ip link del br0 2>&1 >/dev/null || : ip link add br0 type bridge && ip link set $eth master br0 (while :; do bridge fdb add 00:01:02:03:04:05 dev $eth master static bridge fdb del 00:01:02:03:04:05 dev $eth master static done) & pid=$! for i in $(seq 1 50); do bridge fdb show > /dev/null sleep 3 echo "$((${i} * 2))% complete..." done