selftests: forwarding: Add a RED test for SW datapath
This test is inspired by the mlxsw RED selftest. It is much simpler to set up (also because there is no point in testing PRIO / RED encapsulation). It tests bare RED, ECN and ECN+nodrop modes of operation. On top of that it tests RED early_drop and mark qevents. Signed-off-by: Petr Machata <petrm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata
David S. Miller
Родитель
aee9caa03f
Коммит
6cf0291f95
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@ -0,0 +1,492 @@
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# SPDX-License-Identifier: GPL-2.0
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# This test sends one stream of traffic from H1 through a TBF shaper, to a RED
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# within TBF shaper on $swp3. The two shapers have the same configuration, and
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# thus the resulting stream should fill all available bandwidth on the latter
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# shaper. A second stream is sent from H2 also via $swp3, and used to inject
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# additional traffic. Since all available bandwidth is taken, this traffic has
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# to go to backlog.
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#
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# +--------------------------+ +--------------------------+
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# | H1 | | H2 |
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# | + $h1 | | + $h2 |
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# | | 192.0.2.1/28 | | | 192.0.2.2/28 |
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# | | TBF 10Mbps | | | |
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# +-----|--------------------+ +-----|--------------------+
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# | |
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# +-----|------------------------------------------------|--------------------+
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# | SW | | |
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# | +--|------------------------------------------------|----------------+ |
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# | | + $swp1 + $swp2 | |
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# | | BR | |
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# | | | |
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# | | + $swp3 | |
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# | | | TBF 10Mbps / RED | |
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# | +--------------------------------|-----------------------------------+ |
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# | | |
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# +-----------------------------------|---------------------------------------+
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# |
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# +-----|--------------------+
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# | H3 | |
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# | + $h1 |
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# | 192.0.2.3/28 |
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# | |
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# +--------------------------+
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ALL_TESTS="
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ping_ipv4
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ecn_test
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ecn_nodrop_test
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red_test
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red_qevent_test
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ecn_qevent_test
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"
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NUM_NETIFS=6
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CHECK_TC="yes"
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source lib.sh
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BACKLOG=30000
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PKTSZ=1400
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h1_create()
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{
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simple_if_init $h1 192.0.2.1/28
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mtu_set $h1 10000
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tc qdisc replace dev $h1 root handle 1: tbf \
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rate 10Mbit burst 10K limit 1M
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}
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h1_destroy()
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{
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tc qdisc del dev $h1 root
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mtu_restore $h1
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simple_if_fini $h1 192.0.2.1/28
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}
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h2_create()
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{
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simple_if_init $h2 192.0.2.2/28
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mtu_set $h2 10000
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}
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h2_destroy()
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{
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mtu_restore $h2
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simple_if_fini $h2 192.0.2.2/28
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}
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h3_create()
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{
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simple_if_init $h3 192.0.2.3/28
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mtu_set $h3 10000
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}
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h3_destroy()
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{
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mtu_restore $h3
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simple_if_fini $h3 192.0.2.3/28
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}
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switch_create()
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{
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ip link add dev br up type bridge
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ip link set dev $swp1 up master br
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ip link set dev $swp2 up master br
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ip link set dev $swp3 up master br
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mtu_set $swp1 10000
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mtu_set $swp2 10000
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mtu_set $swp3 10000
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tc qdisc replace dev $swp3 root handle 1: tbf \
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rate 10Mbit burst 10K limit 1M
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ip link add name _drop_test up type dummy
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}
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switch_destroy()
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{
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ip link del dev _drop_test
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tc qdisc del dev $swp3 root
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mtu_restore $h3
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mtu_restore $h2
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mtu_restore $h1
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ip link set dev $swp3 down nomaster
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ip link set dev $swp2 down nomaster
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ip link set dev $swp1 down nomaster
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ip link del dev br
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}
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setup_prepare()
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{
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h1=${NETIFS[p1]}
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swp1=${NETIFS[p2]}
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h2=${NETIFS[p3]}
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swp2=${NETIFS[p4]}
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swp3=${NETIFS[p5]}
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h3=${NETIFS[p6]}
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h3_mac=$(mac_get $h3)
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vrf_prepare
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h1_create
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h2_create
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h3_create
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switch_create
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}
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cleanup()
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{
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pre_cleanup
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switch_destroy
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h3_destroy
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h2_destroy
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h1_destroy
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vrf_cleanup
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}
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ping_ipv4()
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{
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ping_test $h1 192.0.2.3 " from host 1"
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ping_test $h2 192.0.2.3 " from host 2"
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}
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get_qdisc_backlog()
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{
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qdisc_stats_get $swp3 11: .backlog
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}
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get_nmarked()
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{
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qdisc_stats_get $swp3 11: .marked
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}
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get_qdisc_npackets()
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{
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qdisc_stats_get $swp3 11: .packets
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}
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get_nmirrored()
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{
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link_stats_get _drop_test tx packets
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}
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send_packets()
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{
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local proto=$1; shift
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local pkts=$1; shift
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$MZ $h2 -p $PKTSZ -a own -b $h3_mac -A 192.0.2.2 -B 192.0.2.3 -t $proto -q -c $pkts "$@"
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}
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# This sends traffic in an attempt to build a backlog of $size. Returns 0 on
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# success. After 10 failed attempts it bails out and returns 1. It dumps the
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# backlog size to stdout.
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build_backlog()
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{
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local size=$1; shift
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local proto=$1; shift
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local i=0
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while :; do
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local cur=$(get_qdisc_backlog)
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local diff=$((size - cur))
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local pkts=$(((diff + PKTSZ - 1) / PKTSZ))
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if ((cur >= size)); then
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echo $cur
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return 0
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elif ((i++ > 10)); then
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echo $cur
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return 1
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fi
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send_packets $proto $pkts "$@"
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sleep 1
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done
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}
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check_marking()
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{
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local cond=$1; shift
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local npackets_0=$(get_qdisc_npackets)
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local nmarked_0=$(get_nmarked)
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sleep 5
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local npackets_1=$(get_qdisc_npackets)
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local nmarked_1=$(get_nmarked)
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local nmarked_d=$((nmarked_1 - nmarked_0))
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local npackets_d=$((npackets_1 - npackets_0))
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local pct=$((100 * nmarked_d / npackets_d))
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echo $pct
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((pct $cond))
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}
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check_mirroring()
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{
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local cond=$1; shift
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local npackets_0=$(get_qdisc_npackets)
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local nmirrored_0=$(get_nmirrored)
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sleep 5
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local npackets_1=$(get_qdisc_npackets)
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local nmirrored_1=$(get_nmirrored)
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local nmirrored_d=$((nmirrored_1 - nmirrored_0))
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local npackets_d=$((npackets_1 - npackets_0))
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local pct=$((100 * nmirrored_d / npackets_d))
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echo $pct
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((pct $cond))
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}
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ecn_test_common()
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{
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local name=$1; shift
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local limit=$1; shift
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local backlog
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local pct
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# Build the below-the-limit backlog using UDP. We could use TCP just
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# fine, but this way we get a proof that UDP is accepted when queue
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# length is below the limit. The main stream is using TCP, and if the
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# limit is misconfigured, we would see this traffic being ECN marked.
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RET=0
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backlog=$(build_backlog $((2 * limit / 3)) udp)
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check_err $? "Could not build the requested backlog"
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pct=$(check_marking "== 0")
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check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
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log_test "$name backlog < limit"
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# Now push TCP, because non-TCP traffic would be early-dropped after the
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# backlog crosses the limit, and we want to make sure that the backlog
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# is above the limit.
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RET=0
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backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
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check_err $? "Could not build the requested backlog"
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pct=$(check_marking ">= 95")
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check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected >= 95."
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log_test "$name backlog > limit"
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}
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do_ecn_test()
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{
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local limit=$1; shift
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local name=ECN
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$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
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-a own -b $h3_mac -t tcp -q tos=0x01 &
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sleep 1
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ecn_test_common "$name" $limit
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# Up there we saw that UDP gets accepted when backlog is below the
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# limit. Now that it is above, it should all get dropped, and backlog
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# building should fail.
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RET=0
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build_backlog $((2 * limit)) udp >/dev/null
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check_fail $? "UDP traffic went into backlog instead of being early-dropped"
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log_test "$name backlog > limit: UDP early-dropped"
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stop_traffic
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sleep 1
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}
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do_ecn_nodrop_test()
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{
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local limit=$1; shift
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local name="ECN nodrop"
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$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
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-a own -b $h3_mac -t tcp -q tos=0x01 &
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sleep 1
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ecn_test_common "$name" $limit
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# Up there we saw that UDP gets accepted when backlog is below the
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# limit. Now that it is above, in nodrop mode, make sure it goes to
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# backlog as well.
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RET=0
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build_backlog $((2 * limit)) udp >/dev/null
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check_err $? "UDP traffic was early-dropped instead of getting into backlog"
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log_test "$name backlog > limit: UDP not dropped"
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stop_traffic
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sleep 1
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}
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do_red_test()
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{
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local limit=$1; shift
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local backlog
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local pct
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# Use ECN-capable TCP to verify there's no marking even though the queue
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# is above limit.
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$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
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-a own -b $h3_mac -t tcp -q tos=0x01 &
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# Pushing below the queue limit should work.
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RET=0
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backlog=$(build_backlog $((2 * limit / 3)) tcp tos=0x01)
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check_err $? "Could not build the requested backlog"
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pct=$(check_marking "== 0")
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check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
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log_test "RED backlog < limit"
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# Pushing above should not.
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RET=0
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backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
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check_fail $? "Traffic went into backlog instead of being early-dropped"
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pct=$(check_marking "== 0")
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check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
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log_test "RED backlog > limit"
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stop_traffic
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sleep 1
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}
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do_red_qevent_test()
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{
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local limit=$1; shift
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local backlog
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local base
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local now
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local pct
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RET=0
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$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
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-a own -b $h3_mac -t udp -q &
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sleep 1
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tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
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action mirred egress mirror dev _drop_test
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# Push to the queue until it's at the limit. The configured limit is
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# rounded by the qdisc, so this is the best we can do to get to the real
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# limit.
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build_backlog $((3 * limit / 2)) udp >/dev/null
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base=$(get_nmirrored)
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send_packets udp 100
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sleep 1
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now=$(get_nmirrored)
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((now >= base + 100))
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check_err $? "Dropped packets not observed: 100 expected, $((now - base)) seen"
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tc filter del block 10 pref 1234 handle 102 matchall
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base=$(get_nmirrored)
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send_packets udp 100
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sleep 1
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now=$(get_nmirrored)
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((now == base))
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check_err $? "Dropped packets still observed: 0 expected, $((now - base)) seen"
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log_test "RED early_dropped packets mirrored"
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stop_traffic
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sleep 1
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}
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do_ecn_qevent_test()
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{
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local limit=$1; shift
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local name=ECN
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RET=0
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$MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
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-a own -b $h3_mac -t tcp -q tos=0x01 &
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sleep 1
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tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
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action mirred egress mirror dev _drop_test
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backlog=$(build_backlog $((2 * limit / 3)) tcp tos=0x01)
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check_err $? "Could not build the requested backlog"
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pct=$(check_mirroring "== 0")
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check_err $? "backlog $backlog / $limit Got $pct% mirrored packets, expected == 0."
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backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
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check_err $? "Could not build the requested backlog"
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pct=$(check_mirroring ">= 95")
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check_err $? "backlog $backlog / $limit Got $pct% mirrored packets, expected >= 95."
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tc filter del block 10 pref 1234 handle 102 matchall
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log_test "ECN marked packets mirrored"
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stop_traffic
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sleep 1
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}
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install_qdisc()
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{
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local -a args=("$@")
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tc qdisc replace dev $swp3 parent 1:1 handle 11: red \
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limit 1M avpkt $PKTSZ probability 1 \
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min $BACKLOG max $((BACKLOG + 1)) burst 38 "${args[@]}"
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sleep 1
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}
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uninstall_qdisc()
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{
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tc qdisc del dev $swp3 parent 1:1
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}
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ecn_test()
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{
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install_qdisc ecn
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do_ecn_test $BACKLOG
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uninstall_qdisc
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}
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ecn_nodrop_test()
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{
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install_qdisc ecn nodrop
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do_ecn_nodrop_test $BACKLOG
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uninstall_qdisc
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}
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red_test()
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{
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install_qdisc
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do_red_test $BACKLOG
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uninstall_qdisc
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}
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red_qevent_test()
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{
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install_qdisc qevent early_drop block 10
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do_red_qevent_test $BACKLOG
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uninstall_qdisc
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}
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ecn_qevent_test()
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{
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install_qdisc ecn qevent mark block 10
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do_ecn_qevent_test $BACKLOG
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uninstall_qdisc
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}
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trap cleanup EXIT
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setup_prepare
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setup_wait
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tests_run
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exit $EXIT_STATUS
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