[LTP] [PATCH v3 3/5] kernel/uevent: Add uevent02

[Clemens Famulla-Conrad <cfamullaconrad@suse.de>]

Reviewed-by: Clemens Famulla-Conrad <cfamullaconrad@suse.de>

On Mon, 2019-08-26 at 16:01 +0200, Cyril Hrubis wrote:
> Similar to uevent01 but we create and remove a tun network card
> instead.
> 
> Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
> ---
>  runtest/uevent                      |   1 +
>  testcases/kernel/uevents/.gitignore |   1 +
>  testcases/kernel/uevents/uevent02.c | 143
> ++++++++++++++++++++++++++++
>  3 files changed, 145 insertions(+)
>  create mode 100644 testcases/kernel/uevents/uevent02.c
> 
> diff --git a/runtest/uevent b/runtest/uevent
> index e9cdf26b8..30b1114a4 100644
> --- a/runtest/uevent
> +++ b/runtest/uevent
> @@ -1 +1,2 @@
>  uevent01 uevent01
> +uevent02 uevent02
> diff --git a/testcases/kernel/uevents/.gitignore
> b/testcases/kernel/uevents/.gitignore
> index 53d0b546a..0afc95534 100644
> --- a/testcases/kernel/uevents/.gitignore
> +++ b/testcases/kernel/uevents/.gitignore
> @@ -1 +1,2 @@
>  uevent01
> +uevent02
> diff --git a/testcases/kernel/uevents/uevent02.c
> b/testcases/kernel/uevents/uevent02.c
> new file mode 100644
> index 000000000..b94748c51
> --- /dev/null
> +++ b/testcases/kernel/uevents/uevent02.c
> @@ -0,0 +1,143 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2019 Cyril Hrubis <chrubis@suse.cz>
> + */
> +
> +/*
> + * Very simple uevent netlink socket test.
> + *
> + * We fork a child that listens for a kernel events while parents
> creates and
> + * removes a tun network device which should produce two several add
> and remove
> + * events.
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <sys/wait.h>
> +#include <linux/if.h>
> +#include <linux/if_tun.h>
> +
> +#include "tst_test.h"
> +
> +#include "uevent.h"
> +
> +#define TUN_PATH "/dev/net/tun"
> +
> +static void generate_tun_uevents(void)
> +{
> +	int fd = SAFE_OPEN(TUN_PATH, O_RDWR);
> +
> +	struct ifreq ifr = {
> +		.ifr_flags = IFF_TUN,
> +		.ifr_name = "ltp-tun0",
> +	};
> +
> +	SAFE_IOCTL(fd, TUNSETIFF, (void*)&ifr);
> +
> +	SAFE_IOCTL(fd, TUNSETPERSIST, 0);
> +
> +	SAFE_CLOSE(fd);
> +}
> +
> +static void verify_uevent(void)
> +{
> +	int pid, fd;
> +
> +	struct uevent_desc add = {
> +		.msg = "add@/devices/virtual/net/ltp-tun0",
> +		.value_cnt = 4,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			"DEVPATH=/devices/virtual/net/ltp-tun0",
> +			"SUBSYSTEM=net",
> +			"INTERFACE=ltp-tun0",
> +		}
> +	};
> +
> +	struct uevent_desc add_rx = {
> +		.msg = "add@/devices/virtual/net/ltp-tun0/queues/rx-
> 0",
> +		.value_cnt = 3,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			"DEVPATH=/devices/virtual/net/ltp-
> tun0/queues/rx-0",
> +			"SUBSYSTEM=queues",
> +		}
> +	};
> +
> +	struct uevent_desc add_tx = {
> +		.msg = "add@/devices/virtual/net/ltp-tun0/queues/tx-
> 0",
> +		.value_cnt = 3,
> +		.values = (const char*[]) {
> +			"ACTION=add",
> +			"DEVPATH=/devices/virtual/net/ltp-
> tun0/queues/tx-0",
> +			"SUBSYSTEM=queues",
> +		}
> +	};
> +
> +	struct uevent_desc rem_rx = {
> +		.msg = "remove@/devices/virtual/net/ltp-
> tun0/queues/rx-0",
> +		.value_cnt = 3,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			"DEVPATH=/devices/virtual/net/ltp-
> tun0/queues/rx-0",
> +			"SUBSYSTEM=queues",
> +		}
> +	};
> +
> +	struct uevent_desc rem_tx = {
> +		.msg = "remove@/devices/virtual/net/ltp-
> tun0/queues/tx-0",
> +		.value_cnt = 3,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			"DEVPATH=/devices/virtual/net/ltp-
> tun0/queues/tx-0",
> +			"SUBSYSTEM=queues",
> +		}
> +	};
> +
> +	struct uevent_desc rem = {
> +		.msg = "remove@/devices/virtual/net/ltp-tun0",
> +		.value_cnt = 4,
> +		.values = (const char*[]) {
> +			"ACTION=remove",
> +			"DEVPATH=/devices/virtual/net/ltp-tun0",
> +			"SUBSYSTEM=net",
> +			"INTERFACE=ltp-tun0",
> +		}
> +	};
> +
> +	const struct uevent_desc *const uevents[] = {
> +		&add,
> +		&add_rx,
> +		&add_tx,
> +		&rem_rx,
> +		&rem_tx,
> +		&rem,
> +		NULL
> +	};
> +
> +	pid = SAFE_FORK();
> +	if (!pid) {
> +		fd = open_uevent_netlink();
> +		TST_CHECKPOINT_WAKE(0);
> +		wait_for_uevents(fd, uevents);
> +		exit(0);
> +	}
> +
> +	TST_CHECKPOINT_WAIT(0);
> +
> +	generate_tun_uevents();
> +
> +	wait_for_pid(pid);
> +}
> +
> +static struct tst_test test = {
> +	.test_all = verify_uevent,
> +	.forks_child = 1,
> +	.needs_tmpdir = 1,
> +	.needs_checkpoints = 1,
> +	.needs_drivers = (const char *const []) {
> +		"tun",
> +		NULL
> +	},
> +	.needs_root = 1
> +};
> -- 
> 2.21.0
> 
>