Merge branch 'selftests-fixes-for-kernel-ci'

Petr Machata says:

====================
selftests: Fixes for kernel CI

As discussed on the bi-weekly call on Jan 30, and in mailing around
kernel CI effort, some changes are desirable in the suite of forwarding
selftests the better to work with the CI tooling. Namely:

- The forwarding selftests use a configuration file where names of
  interfaces are defined and various variables can be overridden. There
  is also forwarding.config.sample that users can use as a template to
  refer to when creating the config file. What happens a fair bit is
  that users either do not know about this at all, or simply forget, and
  are confused by cryptic failures about interfaces that cannot be
  created.

  In patches #1 - #3 have lib.sh just be the single source of truth with
  regards to which variables exist. That includes the topology variables
  which were previously only in the sample file, and any "tweak
  variables", such as what tools to use, sleep times, etc.

  forwarding.config.sample then becomes just a placeholder with a couple
  examples. Unless specific HW should be exercised, or specific tools
  used, the defaults are usually just fine.

- Several net/forwarding/ selftests (and one net/ one) cannot be run on
  veth pairs, they need an actual HW interface to run on. They are
  generic in the sense that any capable HW should pass them, which is
  why they have been put to net/forwarding/ as opposed to drivers/net/,
  but they do not generalize to veth. The fact that these tests are in
  net/forwarding/, but still complaining when run, is confusing.

  In patches #4 - #6 move these tests to a new directory
  drivers/net/hw.

- The following patches extend the codebase to handle well test results
  other than pass and fail.

  Patch #7 is preparatory. It converts several log_test_skip to XFAIL,
  so that tests do not spuriously end up returning non-0 when they
  are not supposed to.

  In patches #8 - #10, introduce some missing ksft constants, then support
  having those constants in RET, and then finally in EXIT_STATUS.

- The traffic scheduler tests generate a large amount of network traffic
  to test the behavior of the scheduler. This demands a relatively
  high-performance computer. On slow machines, such as with a debugging
  kernel, the test would spuriously fail.

  It can still be useful to "go through the motions" though, to possibly
  catch bugs in setup of the scheduler graph and passing packets around.
  Thus we still want to run the tests, just with lowered demands.

  To that end, in patches #11 - #12, introduce an environment variable
  KSFT_MACHINE_SLOW, with obvious meaning. Tests can then make checks
  more lenient, such as mark failures as XFAIL. A helper, xfail_on_slow,
  is provided to mark performance-sensitive parts of the selftest.

- In patch #13, use a similar mechanism to mark a NH group stats
  selftest to XFAIL HW stats tests when run on VETH pairs.

- All these changes complicate the hitherto straightforward logging and
  checking logic, so in patch #14, add a selftest that checks this
  functionality in lib.sh.

v1 (vs. an RFC circulated through linux-kselftest):
- Patch #9:
    - Clarify intended usage by s/set_ret/ret_set_ksft_status/,
      s/nret/ksft_status/
====================

Link: https://lore.kernel.org/r/cover.1711464583.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/drivers/net/hw/Makefile

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0+ OR MIT
+
+TEST_PROGS = \
+	devlink_port_split.py \
+	ethtool.sh \
+	ethtool_extended_state.sh \
+	ethtool_mm.sh \
+	ethtool_rmon.sh \
+	hw_stats_l3.sh \
+	hw_stats_l3_gre.sh \
+	loopback.sh \
+	#
+
+TEST_FILES := \
+	ethtool_lib.sh \
+	#
+
+TEST_INCLUDES := \
+	../../../net/lib.sh \
+	../../../net/forwarding/lib.sh \
+	../../../net/forwarding/ipip_lib.sh \
+	../../../net/forwarding/tc_common.sh \
+	#
+
+include ../../../lib.mk

tools/testing/selftests/net/forwarding/ethtool.sh → tools/testing/selftests/drivers/net/hw/ethtool.sh

@@ -10,7 +10,8 @@ ALL_TESTS="
 	different_speeds_autoneg_on
 "
 NUM_NETIFS=2
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
 source ethtool_lib.sh
 
 h1_create()
@@ -286,8 +287,6 @@ different_speeds_autoneg_on()
 	ethtool -s $h1 autoneg on
 }
 
-skip_on_veth
-
 trap cleanup EXIT
 
 setup_prepare

tools/testing/selftests/net/forwarding/ethtool_extended_state.sh → tools/testing/selftests/drivers/net/hw/ethtool_extended_state.sh

@@ -8,7 +8,8 @@ ALL_TESTS="
 "
 
 NUM_NETIFS=2
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
 source ethtool_lib.sh
 
 TIMEOUT=$((WAIT_TIMEOUT * 1000)) # ms
@@ -108,8 +109,6 @@ no_cable()
 	ip link set dev $swp3 down
 }
 
-skip_on_veth
-
 setup_prepare
 
 tests_run

tools/testing/selftests/net/forwarding/ethtool_mm.sh → tools/testing/selftests/drivers/net/hw/ethtool_mm.sh

@@ -14,7 +14,8 @@ ALL_TESTS="
 NUM_NETIFS=2
 REQUIRE_MZ=no
 PREEMPTIBLE_PRIO=0
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
 
 traffic_test()
 {

tools/testing/selftests/net/forwarding/ethtool_rmon.sh → tools/testing/selftests/drivers/net/hw/ethtool_rmon.sh

@@ -7,7 +7,8 @@ ALL_TESTS="
 "
 
 NUM_NETIFS=2
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
 
 ETH_FCS_LEN=4
 ETH_HLEN=$((6+6+2))
@@ -78,7 +79,7 @@ rmon_histogram()
 
 		for if in $iface $neigh; do
 			if ! ensure_mtu $if ${bucket[0]}; then
-				log_test_skip "$if does not support the required MTU for $step"
+				log_test_xfail "$if does not support the required MTU for $step"
 				return
 			fi
 		done
@@ -93,7 +94,7 @@ rmon_histogram()
 		jq -r ".[0].rmon[\"${set}-pktsNtoM\"][]|[.low, .high]|@tsv" 2>/dev/null)
 
 	if [ $nbuckets -eq 0 ]; then
-		log_test_skip "$iface does not support $set histogram counters"
+		log_test_xfail "$iface does not support $set histogram counters"
 		return
 	fi
 }

tools/testing/selftests/net/forwarding/hw_stats_l3.sh → tools/testing/selftests/drivers/net/hw/hw_stats_l3.sh

@@ -48,7 +48,8 @@ ALL_TESTS="
 	test_double_enable
 "
 NUM_NETIFS=4
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
 
 h1_create()
 {
@@ -324,17 +325,9 @@ setup_wait
 
 used=$(ip -j stats show dev $rp1.200 group offload subgroup hw_stats_info |
 	   jq '.[].info.l3_stats.used')
-kind=$(ip -j -d link show dev $rp1 |
-	   jq -r '.[].linkinfo.info_kind')
-if [[ $used != true ]]; then
-	if [[ $kind == veth ]]; then
-		log_test_skip "l3_stats not offloaded on veth interface"
-		EXIT_STATUS=$ksft_skip
-	else
-		RET=1 log_test "l3_stats not offloaded"
-	fi
-else
-	tests_run
-fi
+[[ $used = true ]]
+check_err $? "hw_stats_info.used=$used"
+log_test "l3_stats offloaded"
+tests_run
 
 exit $EXIT_STATUS

tools/testing/selftests/net/forwarding/hw_stats_l3_gre.sh → tools/testing/selftests/drivers/net/hw/hw_stats_l3_gre.sh

@@ -12,8 +12,9 @@ ALL_TESTS="
 	test_stats_tx
 "
 NUM_NETIFS=6
-source lib.sh
-source ipip_lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/lib.sh
+source "$lib_dir"/../../../net/forwarding/ipip_lib.sh
 
 setup_prepare()
 {
@@ -99,8 +100,6 @@ test_stats_rx()
 	test_stats g2a rx
 }
 
-skip_on_veth
-
 trap cleanup EXIT
 
 setup_prepare

tools/testing/selftests/net/forwarding/loopback.sh → tools/testing/selftests/drivers/net/hw/loopback.sh

@@ -6,8 +6,9 @@ ksft_skip=4
 
 ALL_TESTS="loopback_test"
 NUM_NETIFS=2
-source tc_common.sh
-source lib.sh
+lib_dir=$(dirname "$0")
+source "$lib_dir"/../../../net/forwarding/tc_common.sh
+source "$lib_dir"/../../../net/forwarding/lib.sh
 
 h1_create()
 {

tools/testing/selftests/drivers/net/hw/settings

@@ -0,0 +1 @@
+timeout=0

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

@@ -42,7 +42,7 @@ __mlxsw_only_on_spectrum()
 	local src=$1; shift
 
 	if ! mlxsw_on_spectrum "$rev"; then
-		log_test_skip $src:$caller "(Spectrum-$rev only)"
+		log_test_xfail $src:$caller "(Spectrum-$rev only)"
 		return 1
 	fi
 }

tools/testing/selftests/drivers/net/mlxsw/spectrum-2/resource_scale.sh

@@ -47,7 +47,6 @@ for current_test in ${TESTS:-$ALL_TESTS}; do
 		RET=0
 		target=$(${current_test}_get_target "$should_fail")
 		if ((target == 0)); then
-			log_test_skip "'$current_test' should_fail=$should_fail test"
 			continue
 		fi
 

tools/testing/selftests/drivers/net/mlxsw/spectrum/resource_scale.sh

@@ -52,7 +52,6 @@ for current_test in ${TESTS:-$ALL_TESTS}; do
 			RET=0
 			target=$(${current_test}_get_target "$should_fail")
 			if ((target == 0)); then
-				log_test_skip "'$current_test' [$profile] should_fail=$should_fail test"
 				continue
 			fi
 			${current_test}_setup_prepare

tools/testing/selftests/net/Makefile

@@ -20,7 +20,6 @@ TEST_PROGS += reuseaddr_ports_exhausted.sh
 TEST_PROGS += txtimestamp.sh
 TEST_PROGS += vrf-xfrm-tests.sh
 TEST_PROGS += rxtimestamp.sh
-TEST_PROGS += devlink_port_split.py
 TEST_PROGS += drop_monitor_tests.sh
 TEST_PROGS += vrf_route_leaking.sh
 TEST_PROGS += bareudp.sh

tools/testing/selftests/net/forwarding/Makefile

@@ -15,18 +15,12 @@ TEST_PROGS = bridge_fdb_learning_limit.sh \
 	bridge_vlan_unaware.sh \
 	custom_multipath_hash.sh \
 	dual_vxlan_bridge.sh \
-	ethtool_extended_state.sh \
-	ethtool_mm.sh \
-	ethtool_rmon.sh \
-	ethtool.sh \
 	gre_custom_multipath_hash.sh \
 	gre_inner_v4_multipath.sh \
 	gre_inner_v6_multipath.sh \
 	gre_multipath_nh_res.sh \
 	gre_multipath_nh.sh \
 	gre_multipath.sh \
-	hw_stats_l3.sh \
-	hw_stats_l3_gre.sh \
 	ip6_forward_instats_vrf.sh \
 	ip6gre_custom_multipath_hash.sh \
 	ip6gre_flat_key.sh \
@@ -43,8 +37,8 @@ TEST_PROGS = bridge_fdb_learning_limit.sh \
 	ipip_hier_gre_key.sh \
 	ipip_hier_gre_keys.sh \
 	ipip_hier_gre.sh \
+	lib_sh_test.sh \
 	local_termination.sh \
-	loopback.sh \
 	mirror_gre_bound.sh \
 	mirror_gre_bridge_1d.sh \
 	mirror_gre_bridge_1d_vlan.sh \
@@ -113,7 +107,6 @@ TEST_PROGS = bridge_fdb_learning_limit.sh \
 	vxlan_symmetric.sh
 
 TEST_FILES := devlink_lib.sh \
-	ethtool_lib.sh \
 	fib_offload_lib.sh \
 	forwarding.config.sample \
 	ip6gre_lib.sh \

tools/testing/selftests/net/forwarding/README

@@ -56,3 +56,36 @@ o Checks shall be added to lib.sh for any external dependencies.
 o Code shall be checked using ShellCheck [1] prior to submission.
 
 1. https://www.shellcheck.net/
+
+Customization
+=============
+
+The forwarding selftests framework uses a number of variables that
+influence its behavior and tools it invokes, and how it invokes them, in
+various ways. A number of these variables can be overridden. The way these
+overridable variables are specified is typically one of the following two
+syntaxes:
+
+	: "${VARIABLE:=default_value}"
+	VARIABLE=${VARIABLE:=default_value}
+
+Any of these variables can be overridden. Notably net/forwarding/lib.sh and
+net/lib.sh contain a number of overridable variables.
+
+One way of overriding these variables is through the environment:
+
+	PAUSE_ON_FAIL=yes ./some_test.sh
+
+The variable NETIFS is special. Since it is an array variable, there is no
+way to pass it through the environment. Its value can instead be given as
+consecutive arguments to the selftest:
+
+	./some_test.sh swp{1..8}
+
+A way to customize variables in a persistent fashion is to create a file
+named forwarding.config in this directory. lib.sh sources the file if
+present, so it can contain any shell code. Typically it will contain
+assignments of variables whose value should be overridden.
+
+forwarding.config.sample is available in the directory as an example of
+how forwarding.config might look.

tools/testing/selftests/net/forwarding/forwarding.config.sample

@@ -3,51 +3,28 @@
 
 ##############################################################################
 # Topology description. p1 looped back to p2, p3 to p4 and so on.
-declare -A NETIFS
 
-NETIFS[p1]=veth0
-NETIFS[p2]=veth1
-NETIFS[p3]=veth2
-NETIFS[p4]=veth3
-NETIFS[p5]=veth4
-NETIFS[p6]=veth5
-NETIFS[p7]=veth6
-NETIFS[p8]=veth7
-NETIFS[p9]=veth8
-NETIFS[p10]=veth9
+NETIFS=(
+	[p1]=veth0
+	[p2]=veth1
+	[p3]=veth2
+	[p4]=veth3
+	[p5]=veth4
+	[p6]=veth5
+	[p7]=veth6
+	[p8]=veth7
+	[p9]=veth8
+	[p10]=veth9
+)
 
 # Port that does not have a cable connected.
 NETIF_NO_CABLE=eth8
 
 ##############################################################################
-# Defines
+# In addition to the topology-related variables, it is also possible to override
+# in this file other variables that net/lib.sh, net/forwarding/lib.sh or other
+# libraries or selftests use. E.g.:
 
-# IPv4 ping utility name
-PING=ping
-# IPv6 ping utility name. Some distributions use 'ping' for IPv6.
 PING6=ping6
-# Packet generator. Some distributions use 'mz'.
 MZ=mausezahn
-# mausezahn delay between transmissions in microseconds.
-MZ_DELAY=0
-# Time to wait after interfaces participating in the test are all UP
 WAIT_TIME=5
-# Whether to pause on failure or not.
-PAUSE_ON_FAIL=no
-# Whether to pause on cleanup or not.
-PAUSE_ON_CLEANUP=no
-# Type of network interface to create
-NETIF_TYPE=veth
-# Whether to create virtual interfaces (veth) or not
-NETIF_CREATE=yes
-# Timeout (in seconds) before ping exits regardless of how many packets have
-# been sent or received
-PING_TIMEOUT=5
-# Minimum ageing_time (in centiseconds) supported by hardware
-LOW_AGEING_TIME=1000
-# Flag for tc match, supposed to be skip_sw/skip_hw which means do not process
-# filter by software/hardware
-TC_FLAG=skip_hw
-# IPv6 traceroute utility name.
-TROUTE6=traceroute6
-

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

@@ -141,7 +141,6 @@
 # |               $h2 +       |
 # |     192.0.2.18/28         |
 # +---------------------------+
-source lib.sh
 
 h1_create()
 {