Convert this very simple smoke test to a KUnit test.

Signed-off-by: Tamir Duberstein tamird@gmail.com --- I tested this using:

$ tools/testing/kunit/kunit.py run --arch arm64 --make_options LLVM=1 --kconfig_add CONFIG_NET=y blackholedev --- lib/Kconfig.debug | 20 +++++----- lib/Makefile | 2 +- ...{test_blackhole_dev.c => blackhole_dev_kunit.c} | 45 ++++++++-------------- tools/testing/selftests/net/Makefile | 2 +- tools/testing/selftests/net/test_blackhole_dev.sh | 11 ------ 5 files changed, 28 insertions(+), 52 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 1af972a92d06..238321830993 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -2557,15 +2557,6 @@ config TEST_BPF

If unsure, say N.

-config TEST_BLACKHOLE_DEV - tristate "Test blackhole netdev functionality" - depends on m && NET - help - This builds the "test_blackhole_dev" module that validates the - data path through this blackhole netdev. - - If unsure, say N. - config FIND_BIT_BENCHMARK tristate "Test find_bit functions" help @@ -2888,6 +2879,17 @@ config USERCOPY_KUNIT_TEST on the copy_to/from_user infrastructure, making sure basic user/kernel boundary testing is working.

+config BLACKHOLE_DEV_KUNIT_TEST + tristate "Test blackhole netdev functionality" if !KUNIT_ALL_TESTS + depends on NET + depends on KUNIT + default KUNIT_ALL_TESTS + help + This builds the "blackhole_dev_kunit" module that validates the + data path through this blackhole netdev. + + If unsure, say N. + config TEST_UDELAY tristate "udelay test driver" help diff --git a/lib/Makefile b/lib/Makefile index d5cfc7afbbb8..19ff6993c2bc 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -102,7 +102,6 @@ obj-$(CONFIG_TEST_RUNTIME) += tests/ obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o -obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o obj-$(CONFIG_TEST_HMM) += test_hmm.o @@ -393,6 +392,7 @@ obj-$(CONFIG_FORTIFY_KUNIT_TEST) += fortify_kunit.o obj-$(CONFIG_CRC_KUNIT_TEST) += crc_kunit.o obj-$(CONFIG_SIPHASH_KUNIT_TEST) += siphash_kunit.o obj-$(CONFIG_USERCOPY_KUNIT_TEST) += usercopy_kunit.o +obj-$(CONFIG_BLACKHOLE_DEV_KUNIT_TEST) += blackhole_dev_kunit.o

obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o

diff --git a/lib/test_blackhole_dev.c b/lib/blackhole_dev_kunit.c similarity index 70% rename from lib/test_blackhole_dev.c rename to lib/blackhole_dev_kunit.c index ec290ac2a0d9..f8f5184d5b43 100644 --- a/lib/test_blackhole_dev.c +++ b/lib/blackhole_dev_kunit.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 /* - * This module tests the blackhole_dev that is created during the + * This tests the blackhole_dev that is created during the * net subsystem initialization. The test this module performs is * by injecting an skb into the stack with skb->dev as the * blackhole_dev and expects kernel to behave in a sane manner @@ -9,9 +9,8 @@ * Copyright (c) 2018, Mahesh Bandewar maheshb@google.com */

-#include <linux/init.h> +#include <kunit/test.h> #include <linux/module.h> -#include <linux/printk.h> #include <linux/skbuff.h> #include <linux/netdevice.h> #include <linux/udp.h> @@ -25,17 +24,15 @@

#define UDP_PORT 1234

-static int __init test_blackholedev_init(void) +static void test_blackholedev(struct kunit *test) { struct ipv6hdr *ip6h; struct sk_buff *skb; struct udphdr *uh; int data_len; - int ret;

skb = alloc_skb(SKB_SIZE, GFP_KERNEL); - if (!skb) - return -ENOMEM; + KUNIT_ASSERT_NOT_NULL(test, skb);

/* Reserve head-room for the headers */ skb_reserve(skb, HEAD_SIZE); @@ -68,32 +65,20 @@ static int __init test_blackholedev_init(void) skb->dev = blackhole_netdev;

/* Now attempt to send the packet */ - ret = dev_queue_xmit(skb); - - switch (ret) { - case NET_XMIT_SUCCESS: - pr_warn("dev_queue_xmit() returned NET_XMIT_SUCCESS\n"); - break; - case NET_XMIT_DROP: - pr_warn("dev_queue_xmit() returned NET_XMIT_DROP\n"); - break; - case NET_XMIT_CN: - pr_warn("dev_queue_xmit() returned NET_XMIT_CN\n"); - break; - default: - pr_err("dev_queue_xmit() returned UNKNOWN(%d)\n", ret); - } - - return 0; + KUNIT_EXPECT_EQ(test, dev_queue_xmit(skb), NET_XMIT_SUCCESS); }

-static void __exit test_blackholedev_exit(void) -{ - pr_warn("test_blackholedev module terminating.\n"); -} +static struct kunit_case blackholedev_cases[] = { + KUNIT_CASE(test_blackholedev), + {}, +}; + +static struct kunit_suite blackholedev_suite = { + .name = "blackholedev", + .test_cases = blackholedev_cases, +};

-module_init(test_blackholedev_init); -module_exit(test_blackholedev_exit); +kunit_test_suite(blackholedev_suite);

MODULE_AUTHOR("Mahesh Bandewar maheshb@google.com"); MODULE_DESCRIPTION("module test of the blackhole_dev"); diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile index 73ee88d6b043..afa4bcdc5833 100644 --- a/tools/testing/selftests/net/Makefile +++ b/tools/testing/selftests/net/Makefile @@ -7,7 +7,7 @@ CFLAGS += -I../../../../usr/include/ $(KHDR_INCLUDES) CFLAGS += -I../

TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh \ - rtnetlink.sh xfrm_policy.sh test_blackhole_dev.sh + rtnetlink.sh xfrm_policy.sh TEST_PROGS += fib_tests.sh fib-onlink-tests.sh pmtu.sh udpgso.sh ip_defrag.sh TEST_PROGS += udpgso_bench.sh fib_rule_tests.sh msg_zerocopy.sh psock_snd.sh TEST_PROGS += udpgro_bench.sh udpgro.sh test_vxlan_under_vrf.sh reuseport_addr_any.sh diff --git a/tools/testing/selftests/net/test_blackhole_dev.sh b/tools/testing/selftests/net/test_blackhole_dev.sh deleted file mode 100755 index 3119b80e711f..000000000000 --- a/tools/testing/selftests/net/test_blackhole_dev.sh +++ /dev/null @@ -1,11 +0,0 @@ -#!/bin/sh -# SPDX-License-Identifier: GPL-2.0 -# Runs blackhole-dev test using blackhole-dev kernel module - -if /sbin/modprobe -q test_blackhole_dev ; then - /sbin/modprobe -q -r test_blackhole_dev; - echo "test_blackhole_dev: ok"; -else - echo "test_blackhole_dev: [FAIL]"; - exit 1; -fi

--- base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b change-id: 20250207-blackholedev-kunit-convert-9a52a1a1a032

Best regards,