new file mode 100755
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+# SPDX-License-Identifier: GPL-2.0
+
+# This test sends one stream of traffic from H1 through a TBF shaper, to a RED
+# within TBF shaper on $swp3. The two shapers have the same configuration, and
+# thus the resulting stream should fill all available bandwidth on the latter
+# shaper. A second stream is sent from H2 also via $swp3, and used to inject
+# additional traffic. Since all available bandwidth is taken, this traffic has
+# to go to backlog.
+#
+# +--------------------------+ +--------------------------+
+# | H1 | | H2 |
+# | + $h1 | | + $h2 |
+# | | 192.0.2.1/28 | | | 192.0.2.2/28 |
+# | | TBF 10Mbps | | | |
+# +-----|--------------------+ +-----|--------------------+
+# | |
+# +-----|------------------------------------------------|--------------------+
+# | SW | | |
+# | +--|------------------------------------------------|----------------+ |
+# | | + $swp1 + $swp2 | |
+# | | BR | |
+# | | | |
+# | | + $swp3 | |
+# | | | TBF 10Mbps / RED | |
+# | +--------------------------------|-----------------------------------+ |
+# | | |
+# +-----------------------------------|---------------------------------------+
+# |
+# +-----|--------------------+
+# | H3 | |
+# | + $h1 |
+# | 192.0.2.3/28 |
+# | |
+# +--------------------------+
+
+ALL_TESTS="
+ ping_ipv4
+ ecn_test
+ ecn_nodrop_test
+ red_test
+ red_qevent_test
+ ecn_qevent_test
+"
+
+NUM_NETIFS=6
+CHECK_TC="yes"
+source lib.sh
+
+BACKLOG=30000
+PKTSZ=1400
+
+h1_create()
+{
+ simple_if_init $h1 192.0.2.1/28
+ mtu_set $h1 10000
+ tc qdisc replace dev $h1 root handle 1: tbf \
+ rate 10Mbit burst 10K limit 1M
+}
+
+h1_destroy()
+{
+ tc qdisc del dev $h1 root
+ mtu_restore $h1
+ simple_if_fini $h1 192.0.2.1/28
+}
+
+h2_create()
+{
+ simple_if_init $h2 192.0.2.2/28
+ mtu_set $h2 10000
+}
+
+h2_destroy()
+{
+ mtu_restore $h2
+ simple_if_fini $h2 192.0.2.2/28
+}
+
+h3_create()
+{
+ simple_if_init $h3 192.0.2.3/28
+ mtu_set $h3 10000
+}
+
+h3_destroy()
+{
+ mtu_restore $h3
+ simple_if_fini $h3 192.0.2.3/28
+}
+
+switch_create()
+{
+ ip link add dev br up type bridge
+ ip link set dev $swp1 up master br
+ ip link set dev $swp2 up master br
+ ip link set dev $swp3 up master br
+
+ mtu_set $swp1 10000
+ mtu_set $swp2 10000
+ mtu_set $swp3 10000
+
+ tc qdisc replace dev $swp3 root handle 1: tbf \
+ rate 10Mbit burst 10K limit 1M
+ ip link add name _drop_test up type dummy
+}
+
+switch_destroy()
+{
+ ip link del dev _drop_test
+ tc qdisc del dev $swp3 root
+
+ mtu_restore $h3
+ mtu_restore $h2
+ mtu_restore $h1
+
+ ip link set dev $swp3 down nomaster
+ ip link set dev $swp2 down nomaster
+ ip link set dev $swp1 down nomaster
+ ip link del dev br
+}
+
+setup_prepare()
+{
+ h1=${NETIFS[p1]}
+ swp1=${NETIFS[p2]}
+
+ h2=${NETIFS[p3]}
+ swp2=${NETIFS[p4]}
+
+ swp3=${NETIFS[p5]}
+ h3=${NETIFS[p6]}
+
+ h3_mac=$(mac_get $h3)
+
+ vrf_prepare
+
+ h1_create
+ h2_create
+ h3_create
+ switch_create
+}
+
+cleanup()
+{
+ pre_cleanup
+
+ switch_destroy
+ h3_destroy
+ h2_destroy
+ h1_destroy
+
+ vrf_cleanup
+}
+
+ping_ipv4()
+{
+ ping_test $h1 192.0.2.3 " from host 1"
+ ping_test $h2 192.0.2.3 " from host 2"
+}
+
+get_qdisc_backlog()
+{
+ qdisc_stats_get $swp3 11: .backlog
+}
+
+get_nmarked()
+{
+ qdisc_stats_get $swp3 11: .marked
+}
+
+get_qdisc_npackets()
+{
+ qdisc_stats_get $swp3 11: .packets
+}
+
+get_nmirrored()
+{
+ link_stats_get _drop_test tx packets
+}
+
+send_packets()
+{
+ local proto=$1; shift
+ local pkts=$1; shift
+
+ $MZ $h2 -p $PKTSZ -a own -b $h3_mac -A 192.0.2.2 -B 192.0.2.3 -t $proto -q -c $pkts "$@"
+}
+
+# This sends traffic in an attempt to build a backlog of $size. Returns 0 on
+# success. After 10 failed attempts it bails out and returns 1. It dumps the
+# backlog size to stdout.
+build_backlog()
+{
+ local size=$1; shift
+ local proto=$1; shift
+
+ local i=0
+
+ while :; do
+ local cur=$(get_qdisc_backlog)
+ local diff=$((size - cur))
+ local pkts=$(((diff + PKTSZ - 1) / PKTSZ))
+
+ if ((cur >= size)); then
+ echo $cur
+ return 0
+ elif ((i++ > 10)); then
+ echo $cur
+ return 1
+ fi
+
+ send_packets $proto $pkts "$@"
+ sleep 1
+ done
+}
+
+check_marking()
+{
+ local cond=$1; shift
+
+ local npackets_0=$(get_qdisc_npackets)
+ local nmarked_0=$(get_nmarked)
+ sleep 5
+ local npackets_1=$(get_qdisc_npackets)
+ local nmarked_1=$(get_nmarked)
+
+ local nmarked_d=$((nmarked_1 - nmarked_0))
+ local npackets_d=$((npackets_1 - npackets_0))
+ local pct=$((100 * nmarked_d / npackets_d))
+
+ echo $pct
+ ((pct $cond))
+}
+
+check_mirroring()
+{
+ local cond=$1; shift
+
+ local npackets_0=$(get_qdisc_npackets)
+ local nmirrored_0=$(get_nmirrored)
+ sleep 5
+ local npackets_1=$(get_qdisc_npackets)
+ local nmirrored_1=$(get_nmirrored)
+
+ local nmirrored_d=$((nmirrored_1 - nmirrored_0))
+ local npackets_d=$((npackets_1 - npackets_0))
+ local pct=$((100 * nmirrored_d / npackets_d))
+
+ echo $pct
+ ((pct $cond))
+}
+
+ecn_test_common()
+{
+ local name=$1; shift
+ local limit=$1; shift
+ local backlog
+ local pct
+
+ # Build the below-the-limit backlog using UDP. We could use TCP just
+ # fine, but this way we get a proof that UDP is accepted when queue
+ # length is below the limit. The main stream is using TCP, and if the
+ # limit is misconfigured, we would see this traffic being ECN marked.
+ RET=0
+ backlog=$(build_backlog $((2 * limit / 3)) udp)
+ check_err $? "Could not build the requested backlog"
+ pct=$(check_marking "== 0")
+ check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
+ log_test "$name backlog < limit"
+
+ # Now push TCP, because non-TCP traffic would be early-dropped after the
+ # backlog crosses the limit, and we want to make sure that the backlog
+ # is above the limit.
+ RET=0
+ backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
+ check_err $? "Could not build the requested backlog"
+ pct=$(check_marking ">= 95")
+ check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected >= 95."
+ log_test "$name backlog > limit"
+}
+
+do_ecn_test()
+{
+ local limit=$1; shift
+ local name=ECN
+
+ $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
+ -a own -b $h3_mac -t tcp -q tos=0x01 &
+ sleep 1
+
+ ecn_test_common "$name" $limit
+
+ # Up there we saw that UDP gets accepted when backlog is below the
+ # limit. Now that it is above, it should all get dropped, and backlog
+ # building should fail.
+ RET=0
+ build_backlog $((2 * limit)) udp >/dev/null
+ check_fail $? "UDP traffic went into backlog instead of being early-dropped"
+ log_test "$name backlog > limit: UDP early-dropped"
+
+ stop_traffic
+ sleep 1
+}
+
+do_ecn_nodrop_test()
+{
+ local limit=$1; shift
+ local name="ECN nodrop"
+
+ $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
+ -a own -b $h3_mac -t tcp -q tos=0x01 &
+ sleep 1
+
+ ecn_test_common "$name" $limit
+
+ # Up there we saw that UDP gets accepted when backlog is below the
+ # limit. Now that it is above, in nodrop mode, make sure it goes to
+ # backlog as well.
+ RET=0
+ build_backlog $((2 * limit)) udp >/dev/null
+ check_err $? "UDP traffic was early-dropped instead of getting into backlog"
+ log_test "$name backlog > limit: UDP not dropped"
+
+ stop_traffic
+ sleep 1
+}
+
+do_red_test()
+{
+ local limit=$1; shift
+ local backlog
+ local pct
+
+ # Use ECN-capable TCP to verify there's no marking even though the queue
+ # is above limit.
+ $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
+ -a own -b $h3_mac -t tcp -q tos=0x01 &
+
+ # Pushing below the queue limit should work.
+ RET=0
+ backlog=$(build_backlog $((2 * limit / 3)) tcp tos=0x01)
+ check_err $? "Could not build the requested backlog"
+ pct=$(check_marking "== 0")
+ check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
+ log_test "RED backlog < limit"
+
+ # Pushing above should not.
+ RET=0
+ backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
+ check_fail $? "Traffic went into backlog instead of being early-dropped"
+ pct=$(check_marking "== 0")
+ check_err $? "backlog $backlog / $limit Got $pct% marked packets, expected == 0."
+ log_test "RED backlog > limit"
+
+ stop_traffic
+ sleep 1
+}
+
+do_red_qevent_test()
+{
+ local limit=$1; shift
+ local backlog
+ local base
+ local now
+ local pct
+
+ RET=0
+
+ $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
+ -a own -b $h3_mac -t udp -q &
+ sleep 1
+
+ tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
+ action mirred egress mirror dev _drop_test
+
+ # Push to the queue until it's at the limit. The configured limit is
+ # rounded by the qdisc, so this is the best we can do to get to the real
+ # limit.
+ build_backlog $((3 * limit / 2)) udp >/dev/null
+
+ base=$(get_nmirrored)
+ send_packets udp 100
+ sleep 1
+ now=$(get_nmirrored)
+ ((now >= base + 100))
+ check_err $? "Dropped packets not observed: 100 expected, $((now - base)) seen"
+
+ tc filter del block 10 pref 1234 handle 102 matchall
+
+ base=$(get_nmirrored)
+ send_packets udp 100
+ sleep 1
+ now=$(get_nmirrored)
+ ((now == base))
+ check_err $? "Dropped packets still observed: 0 expected, $((now - base)) seen"
+
+ log_test "RED early_dropped packets mirrored"
+
+ stop_traffic
+ sleep 1
+}
+
+do_ecn_qevent_test()
+{
+ local limit=$1; shift
+ local name=ECN
+
+ RET=0
+
+ $MZ $h1 -p $PKTSZ -A 192.0.2.1 -B 192.0.2.3 -c 0 \
+ -a own -b $h3_mac -t tcp -q tos=0x01 &
+ sleep 1
+
+ tc filter add block 10 pref 1234 handle 102 matchall skip_hw \
+ action mirred egress mirror dev _drop_test
+
+ backlog=$(build_backlog $((2 * limit / 3)) tcp tos=0x01)
+ check_err $? "Could not build the requested backlog"
+ pct=$(check_mirroring "== 0")
+ check_err $? "backlog $backlog / $limit Got $pct% mirrored packets, expected == 0."
+
+ backlog=$(build_backlog $((3 * limit / 2)) tcp tos=0x01)
+ check_err $? "Could not build the requested backlog"
+ pct=$(check_mirroring ">= 95")
+ check_err $? "backlog $backlog / $limit Got $pct% mirrored packets, expected >= 95."
+
+ tc filter del block 10 pref 1234 handle 102 matchall
+
+ log_test "ECN marked packets mirrored"
+
+ stop_traffic
+ sleep 1
+}
+
+install_qdisc()
+{
+ local -a args=("$@")
+
+ tc qdisc replace dev $swp3 parent 1:1 handle 11: red \
+ limit 1M avpkt $PKTSZ probability 1 \
+ min $BACKLOG max $((BACKLOG + 1)) burst 38 "${args[@]}"
+ sleep 1
+}
+
+uninstall_qdisc()
+{
+ tc qdisc del dev $swp3 parent 1:1
+}
+
+ecn_test()
+{
+ install_qdisc ecn
+ do_ecn_test $BACKLOG
+ uninstall_qdisc
+}
+
+ecn_nodrop_test()
+{
+ install_qdisc ecn nodrop
+ do_ecn_nodrop_test $BACKLOG
+ uninstall_qdisc
+}
+
+red_test()
+{
+ install_qdisc
+ do_red_test $BACKLOG
+ uninstall_qdisc
+}
+
+red_qevent_test()
+{
+ install_qdisc qevent early_drop block 10
+ do_red_qevent_test $BACKLOG
+ uninstall_qdisc
+}
+
+ecn_qevent_test()
+{
+ install_qdisc ecn qevent mark block 10
+ do_ecn_qevent_test $BACKLOG
+ uninstall_qdisc
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS
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> --- .../selftests/net/forwarding/sch_red.sh | 492 ++++++++++++++++++ 1 file changed, 492 insertions(+) create mode 100755 tools/testing/selftests/net/forwarding/sch_red.sh