tools/testing/selftests/drivers/net/dsa/test_bridge_fdb_stress.sh

   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
  16 WAIT_TIME=1
  17 NUM_NETIFS=1
  18 REQUIRE_JQ="no"
  19 REQUIRE_MZ="no"
  20 NETIF_CREATE="no"
  21 lib_dir=$(dirname "$0")
  22 source "$lib_dir"/../../../net/forwarding/lib.sh
  23
  24 cleanup() {
  25         echo "Cleaning up"
  26         kill $pid && wait $pid &> /dev/null
  27         ip link del br0
  28         echo "Please check kernel log for errors"
  29 }
  30 trap 'cleanup' EXIT
  31
  32 eth=${NETIFS[p1]}
  33
  34 ip link del br0 2>&1 >/dev/null || :
  35 ip 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 $eth master static
  40 done) &
  41 pid=$!
  42
  43 for i in $(seq 1 50); do
  44         bridge fdb show > /dev/null
  45         sleep 3
  46         echo "$((${i} * 2))% complete..."
  47 done