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#!/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
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