test-ct-tcp-reload.sh

#!/bin/bash
#
# Test CT fwd with tcp traffic and reload the driver.
#
# This reproduces an issue with remaining object the fc cache.
# 507138.876287] BUG mlx5_fc_cache (Tainted: G    B      OE    ): Objects
# remaining in mlx5_fc_cache on __kmem_cache_shutdown()
#

my_dir="$(dirname "$0")"
. $my_dir/common.sh

require_module act_ct
echo 1 > /proc/sys/net/netfilter/nf_conntrack_tcp_be_liberal

IP1="7.7.7.1"
IP2="7.7.7.2"

enable_switchdev
require_interfaces REP REP2
unbind_vfs
bind_vfs
reset_tc $REP
reset_tc $REP2

mac1=`cat /sys/class/net/$VF/address`
mac2=`cat /sys/class/net/$VF2/address`

test "$mac1" || fail "no mac1"
test "$mac2" || fail "no mac2"

function cleanup() {
    ip netns del ns0 2> /dev/null
    ip netns del ns1 2> /dev/null
    reset_tc $REP &>/dev/null
    reset_tc $REP2 &> /dev/null
}
trap cleanup EXIT

function run() {
    title "Test CT TCP"
    config_vf ns0 $VF $REP $IP1
    config_vf ns1 $VF2 $REP2 $IP2

    echo "add arp rules"
    tc_filter add dev $REP ingress protocol arp prio 1 flower \
        action mirred egress redirect dev $REP2

    tc_filter add dev $REP2 ingress protocol arp prio 1 flower \
        action mirred egress redirect dev $REP

    echo "add ct rules"
    tc_filter add dev $REP ingress protocol ip prio 2 flower \
        dst_mac $mac2 ct_state -trk \
        action ct action goto chain 1

    tc_filter add dev $REP ingress protocol ip chain 1 prio 2 flower \
        dst_mac $mac2 ct_state +trk+new \
        action ct commit \
        action mirred egress redirect dev $REP2

    tc_filter add dev $REP ingress protocol ip chain 1 prio 2 flower \
        dst_mac $mac2 ct_state +trk+est \
        action mirred egress redirect dev $REP2

    # chain0,ct -> chain1,fwd
    tc_filter add dev $REP2 ingress protocol ip prio 2 flower \
        dst_mac $mac1 \
        action ct action goto chain 1

    tc_filter add dev $REP2 ingress protocol ip prio 2 chain 1 flower \
        dst_mac $mac1 ct_state +trk+est \
        action mirred egress redirect dev $REP

    fail_if_err

    echo $REP
    tc filter show dev $REP ingress
    echo $REP2
    tc filter show dev $REP2 ingress

    t=12
    echo "run traffic for $t seconds"
    ip netns exec ns1 timeout $((t+1)) iperf -s &
    sleep 0.5
    ip netns exec ns0 timeout $((t+1)) iperf -t $t -c $IP2  &

    sleep 2
    pidof iperf &>/dev/null || err "iperf failed"

    echo "sniff packets on $REP"
    # first 4 packets not offloaded until conn is in established state.
    timeout $((t-4)) tcpdump -qnnei $REP -c 10 'tcp' &
    pid=$!

    sleep $t
    killall -9 iperf &>/dev/null
    wait $! 2>/dev/null

    title "Verify no traffic on $REP"
    verify_no_traffic $pid

    sleep 1
    reload_modules
    config_sriov 2
}


run
test_done