[LTP] [PATCH] kernel/uevent: Adjust the number of uevents dynamically in uevent02

[Dylan Jhong]

When CONFIG_SMP is not selected, CONFIG_RPS will not be enabled. Causes the
kernel to not create rx queues in sysfs[*1] when creating tun devices.
uevent02 will check if the rx queue exists, so we have to dynamically adjust
the number of uevents to pass this testcase.

[*1]: https://github.com/torvalds/linux/blob/3245cb65fd91cd514801bf91f5a3066d562f0ac4/net/core/net-sysfs.c#L1109

Signed-off-by: Dylan Jhong <dylan@andestech.com>
---
 testcases/kernel/uevents/uevent02.c | 146 ++++++++++++++--------------
 1 file changed, 73 insertions(+), 73 deletions(-)

diff --git a/testcases/kernel/uevents/uevent02.c b/testcases/kernel/uevents/uevent02.c
index ce0cf757d..059320f1c 100644
--- a/testcases/kernel/uevents/uevent02.c
+++ b/testcases/kernel/uevents/uevent02.c
@@ -19,11 +19,71 @@
 #include <linux/if_tun.h>
 
 #include "tst_test.h"
+#include "tst_private.h"
 
 #include "uevent.h"
 
 #define TUN_PATH "/dev/net/tun"
 
+#define MAX_UEVENT 7
+
+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",
+	}
+};
+
 static void generate_tun_uevents(void)
 {
 	int fd = SAFE_OPEN(TUN_PATH, O_RDWR);
@@ -42,79 +102,19 @@ static void generate_tun_uevents(void)
 
 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
-	};
+	const struct uevent_desc *uevents[MAX_UEVENT];
+	int pid, fd, i = 0;
+	int has_RPS = tst_kconfig_get("CONFIG_RPS");
+
+	uevents[i++] = &add;
+	if (has_RPS)
+		uevents[i++] = &add_rx;
+	uevents[i++] = &add_tx;
+	if (has_RPS)
+		uevents[i++] = &rem_rx;
+	uevents[i++] = &rem_tx;
+	uevents[i++] = &rem;
+	uevents[i++] = NULL;
 
 	pid = SAFE_FORK();
 	if (!pid) {
-- 
2.34.1