Merge branch 'net-selftests-mirroring-cleanup' into main

Petr Machata says:

====================
selftest: Clean-up and stabilize mirroring tests

The mirroring selftests work by sending ICMP traffic between two hosts.
Along the way, this traffic is mirrored to a gretap netdevice, and counter
taps are then installed strategically along the path of the mirrored
traffic to verify the mirroring took place.

The problem with this is that besides mirroring the primary traffic, any
other service traffic is mirrored as well. At the same time, because the
tests need to work in HW-offloaded scenarios, the ability of the device to
do arbitrary packet inspection should not be taken for granted. Most tests
therefore simply use matchall, one uses flower to match on IP address.
As a result, the selftests are noisy.

mirror_test() accommodated this noisiness by giving the counters an
allowance of several packets. But that only works up to a point, and on
busy systems won't be always enough.

In this patch set, clean up and stabilize the mirroring selftests. The
original intention was to port the tests over to UDP, but the logic of
ICMP ends up being so entangled in the mirroring selftests that the
changes feel overly invasive. Instead, ICMP is kept, but where possible,
we match on ICMP message type, thus filtering out hits by other ICMP
messages.

Where this is not practical (where the counter tap is put on a device
that carries encapsulated packets), switch the counter condition to _at
least_ X observed packets. This is less robust, but barely so --
probably the only scenario that this would not catch is something like
erroneous packet duplication, which would hopefully get caught by the
numerous other tests in this extensive suite.

- Patches #1 to #3 clean up parameters at various helpers.

- Patches #4 to #6 stabilize the mirroring selftests as described above.

- Mirroring tests currently allow testing SW datapath even on HW
  netdevices by trapping traffic to the SW datapath. This complicates
  the tests a bit without a good reason: to test SW datapath, just run
  the selftests on the veth topology. Thus in patch #7, drop support for
  this dual SW/HW testing.

- At this point, some cleanups were either made possible by the previous
  patches, or were always possible. In patches #8 to #11, realize these
  cleanups.

- In patch #12, fix mlxsw mirror_gre selftest to respect setting TESTS.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/drivers/net/mlxsw/mirror_gre.sh

@@ -15,6 +15,13 @@ source $lib_dir/mirror_lib.sh
 source $lib_dir/mirror_gre_lib.sh
 source $lib_dir/mirror_gre_topo_lib.sh
 
+ALL_TESTS="
+	test_keyful
+	test_soft
+	test_tos_fixed
+	test_ttl_inherit
+"
+
 setup_keyful()
 {
 	tunnel_create gt6-key ip6gretap 2001:db8:3::1 2001:db8:3::2 \
@@ -118,15 +125,15 @@ test_span_gre_ttl_inherit()
 	RET=0
 
 	ip link set dev $tundev type $type ttl inherit
-	mirror_install $swp1 ingress $tundev "matchall $tcflags"
-	fail_test_span_gre_dir $tundev ingress
+	mirror_install $swp1 ingress $tundev "matchall"
+	fail_test_span_gre_dir $tundev
 
 	ip link set dev $tundev type $type ttl 100
 
-	quick_test_span_gre_dir $tundev ingress
+	quick_test_span_gre_dir $tundev
 	mirror_uninstall $swp1 ingress
 
-	log_test "$what: no offload on TTL of inherit ($tcflags)"
+	log_test "$what: no offload on TTL of inherit"
 }
 
 test_span_gre_tos_fixed()
@@ -138,61 +145,49 @@ test_span_gre_tos_fixed()
 	RET=0
 
 	ip link set dev $tundev type $type tos 0x10
-	mirror_install $swp1 ingress $tundev "matchall $tcflags"
-	fail_test_span_gre_dir $tundev ingress
+	mirror_install $swp1 ingress $tundev "matchall"
+	fail_test_span_gre_dir $tundev
 
 	ip link set dev $tundev type $type tos inherit
-	quick_test_span_gre_dir $tundev ingress
+	quick_test_span_gre_dir $tundev
 	mirror_uninstall $swp1 ingress
 
-	log_test "$what: no offload on a fixed TOS ($tcflags)"
+	log_test "$what: no offload on a fixed TOS"
 }
 
 test_span_failable()
 {
-	local should_fail=$1; shift
 	local tundev=$1; shift
 	local what=$1; shift
 
 	RET=0
 
-	mirror_install $swp1 ingress $tundev "matchall $tcflags"
-	if ((should_fail)); then
-	    fail_test_span_gre_dir  $tundev ingress
-	else
-	    quick_test_span_gre_dir $tundev ingress
-	fi
+	mirror_install $swp1 ingress $tundev "matchall"
+	fail_test_span_gre_dir  $tundev
 	mirror_uninstall $swp1 ingress
 
-	log_test "$what: should_fail=$should_fail ($tcflags)"
+	log_test "fail $what"
 }
 
-test_failable()
+test_keyful()
 {
-	local should_fail=$1; shift
-
-	test_span_failable $should_fail gt6-key "mirror to keyful gretap"
-	test_span_failable $should_fail gt6-soft "mirror to gretap w/ soft underlay"
+	test_span_failable gt6-key "mirror to keyful gretap"
 }
 
-test_sw()
+test_soft()
 {
-	slow_path_trap_install $swp1 ingress
-	slow_path_trap_install $swp1 egress
-
-	test_failable 0
-
-	slow_path_trap_uninstall $swp1 egress
-	slow_path_trap_uninstall $swp1 ingress
+	test_span_failable gt6-soft "mirror to gretap w/ soft underlay"
 }
 
-test_hw()
+test_tos_fixed()
 {
-	test_failable 1
-
 	test_span_gre_tos_fixed gt4 gretap "mirror to gretap"
 	test_span_gre_tos_fixed gt6 ip6gretap "mirror to ip6gretap"
+}
+
 
+test_ttl_inherit()
+{
 	test_span_gre_ttl_inherit gt4 gretap "mirror to gretap"
 	test_span_gre_ttl_inherit gt6 ip6gretap "mirror to ip6gretap"
 }
@@ -202,16 +197,6 @@ trap cleanup EXIT
 setup_prepare
 setup_wait
 
-if ! tc_offload_check; then
-    check_err 1 "Could not test offloaded functionality"
-    log_test "mlxsw-specific tests for mirror to gretap"
-    exit
-fi
-
-tcflags="skip_hw"
-test_sw
-
-tcflags="skip_sw"
-test_hw
+tests_run
 
 exit $EXIT_STATUS

tools/testing/selftests/drivers/net/mlxsw/mirror_gre_scale.sh

@@ -79,7 +79,7 @@ mirror_gre_tunnels_create()
 		cat >> $MIRROR_GRE_BATCH_FILE <<-EOF
 			filter add dev $swp1 ingress pref 1000 \
 				protocol ipv6 \
-				flower $tcflags dst_ip $match_dip \
+				flower skip_sw dst_ip $match_dip \
 				action mirred egress mirror dev $tun
 		EOF
 	done
@@ -107,7 +107,7 @@ mirror_gre_tunnels_destroy()
 	done
 }
 
-__mirror_gre_test()
+mirror_gre_test()
 {
 	local count=$1; shift
 	local should_fail=$1; shift
@@ -131,20 +131,6 @@ __mirror_gre_test()
 	done
 }
 
-mirror_gre_test()
-{
-	local count=$1; shift
-	local should_fail=$1; shift
-
-	if ! tc_offload_check $TC_FLOWER_NUM_NETIFS; then
-		check_err 1 "Could not test offloaded functionality"
-		return
-	fi
-
-	tcflags="skip_sw"
-	__mirror_gre_test $count $should_fail
-}
-
 mirror_gre_setup_prepare()
 {
 	h1=${NETIFS[p1]}

tools/testing/selftests/net/forwarding/lib.sh

@@ -1225,22 +1225,6 @@ trap_uninstall()
 	tc filter del dev $dev $direction pref 1 flower
 }
 
-slow_path_trap_install()
-{
-	# For slow-path testing, we need to install a trap to get to
-	# slow path the packets that would otherwise be switched in HW.
-	if [ "${tcflags/skip_hw}" != "$tcflags" ]; then
-		trap_install "$@"
-	fi
-}
-
-slow_path_trap_uninstall()
-{
-	if [ "${tcflags/skip_hw}" != "$tcflags" ]; then
-		trap_uninstall "$@"
-	fi
-}
-
 __icmp_capture_add_del()
 {
 	local add_del=$1; shift
@@ -1257,22 +1241,34 @@ __icmp_capture_add_del()
 
 icmp_capture_install()
 {
-	__icmp_capture_add_del add 100 "" "$@"
+	local tundev=$1; shift
+	local filter=$1; shift
+
+	__icmp_capture_add_del add 100 "" "$tundev" "$filter"
 }
 
 icmp_capture_uninstall()
 {
-	__icmp_capture_add_del del 100 "" "$@"
+	local tundev=$1; shift
+	local filter=$1; shift
+
+	__icmp_capture_add_del del 100 "" "$tundev" "$filter"
 }
 
 icmp6_capture_install()
 {
-	__icmp_capture_add_del add 100 v6 "$@"
+	local tundev=$1; shift
+	local filter=$1; shift
+
+	__icmp_capture_add_del add 100 v6 "$tundev" "$filter"
 }
 
 icmp6_capture_uninstall()
 {
-	__icmp_capture_add_del del 100 v6 "$@"
+	local tundev=$1; shift
+	local filter=$1; shift
+
+	__icmp_capture_add_del del 100 v6 "$tundev" "$filter"
 }
 
 __vlan_capture_add_del()
@@ -1290,12 +1286,18 @@ __vlan_capture_add_del()
 
 vlan_capture_install()
 {
-	__vlan_capture_add_del add 100 "$@"
+	local dev=$1; shift
+	local filter=$1; shift
+
+	__vlan_capture_add_del add 100 "$dev" "$filter"
 }
 
 vlan_capture_uninstall()
 {
-	__vlan_capture_add_del del 100 "$@"
+	local dev=$1; shift
+	local filter=$1; shift
+
+	__vlan_capture_add_del del 100 "$dev" "$filter"
 }
 
 __dscp_capture_add_del()
@@ -1655,34 +1657,61 @@ __start_traffic()
 	local sip=$1; shift
 	local dip=$1; shift
 	local dmac=$1; shift
+	local -a mz_args=("$@")
 
 	$MZ $h_in -p $pktsize -A $sip -B $dip -c 0 \
-		-a own -b $dmac -t "$proto" -q "$@" &
+		-a own -b $dmac -t "$proto" -q "${mz_args[@]}" &
 	sleep 1
 }
 
 start_traffic_pktsize()
 {
 	local pktsize=$1; shift
+	local h_in=$1; shift
+	local sip=$1; shift
+	local dip=$1; shift
+	local dmac=$1; shift
+	local -a mz_args=("$@")
 
-	__start_traffic $pktsize udp "$@"
+	__start_traffic $pktsize udp "$h_in" "$sip" "$dip" "$dmac" \
+			"${mz_args[@]}"
 }
 
 start_tcp_traffic_pktsize()
 {
 	local pktsize=$1; shift
+	local h_in=$1; shift
+	local sip=$1; shift
+	local dip=$1; shift
+	local dmac=$1; shift
+	local -a mz_args=("$@")
 
-	__start_traffic $pktsize tcp "$@"
+	__start_traffic $pktsize tcp "$h_in" "$sip" "$dip" "$dmac" \
+			"${mz_args[@]}"
 }
 
 start_traffic()
 {
-	start_traffic_pktsize 8000 "$@"
+	local h_in=$1; shift
+	local sip=$1; shift
+	local dip=$1; shift
+	local dmac=$1; shift
+	local -a mz_args=("$@")
+
+	start_traffic_pktsize 8000 "$h_in" "$sip" "$dip" "$dmac" \
+			      "${mz_args[@]}"
 }
 
 start_tcp_traffic()
 {
-	start_tcp_traffic_pktsize 8000 "$@"
+	local h_in=$1; shift
+	local sip=$1; shift
+	local dip=$1; shift
+	local dmac=$1; shift
+	local -a mz_args=("$@")
+
+	start_tcp_traffic_pktsize 8000 "$h_in" "$sip" "$dip" "$dmac" \
+				  "${mz_args[@]}"
 }
 
 stop_traffic()