[bpf-next PATCH v2 1/5] selftests/bpf: Move test_tcppbf_user into test_progs

[Alexander Duyck <alexander.duyck@gmail.com>]

From: Alexander Duyck <alexanderduyck@fb.com>

Recently a bug was missed due to the fact that test_tcpbpf_user is not a
part of test_progs. In order to prevent similar issues in the future move
the test functionality into test_progs. By doing this we can make certain
that it is a part of standard testing and will not be overlooked.

As a part of moving the functionality into test_progs it is necessary to
integrate with the test_progs framework and to drop any redundant code.
This patch:
1. Cleans up the include headers
2. Dropped a duplicate definition of bpf_find_map
3. Switched over to using test_progs specific cgroup functions
4. Replaced printf calls with fprintf to stderr
5. Renamed main to test_tcpbpf_user
6. Dropped return value in favor of CHECK_FAIL to check for errors

The general idea is that I wanted to keep the changes as small as possible
while moving the file into the test_progs framework. The follow-on patches
are meant to clean up the remaining issues such as the use of CHECK_FAIL.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
---
 tools/testing/selftests/bpf/.gitignore             |    1 
 tools/testing/selftests/bpf/Makefile               |    3 -
 .../testing/selftests/bpf/prog_tests/tcpbpf_user.c |   63 ++++++--------------
 3 files changed, 21 insertions(+), 46 deletions(-)
 rename tools/testing/selftests/bpf/{test_tcpbpf_user.c => prog_tests/tcpbpf_user.c} (70%)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index 3ab1200e172f..395ae040ce1f 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -8,7 +8,6 @@ FEATURE-DUMP.libbpf
 fixdep
 test_dev_cgroup
 /test_progs*
-test_tcpbpf_user
 test_verifier_log
 feature
 test_sock
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 542768f5195b..50e5b18fc455 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -32,7 +32,7 @@ LDLIBS += -lcap -lelf -lz -lrt -lpthread
 
 # Order correspond to 'make run_tests' order
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \
-	test_verifier_log test_dev_cgroup test_tcpbpf_user \
+	test_verifier_log test_dev_cgroup \
 	test_sock test_sockmap get_cgroup_id_user test_socket_cookie \
 	test_cgroup_storage \
 	test_netcnt test_tcpnotify_user test_sysctl \
@@ -163,7 +163,6 @@ $(OUTPUT)/test_sock: cgroup_helpers.c
 $(OUTPUT)/test_sock_addr: cgroup_helpers.c
 $(OUTPUT)/test_socket_cookie: cgroup_helpers.c
 $(OUTPUT)/test_sockmap: cgroup_helpers.c
-$(OUTPUT)/test_tcpbpf_user: cgroup_helpers.c
 $(OUTPUT)/test_tcpnotify_user: cgroup_helpers.c trace_helpers.c
 $(OUTPUT)/get_cgroup_id_user: cgroup_helpers.c
 $(OUTPUT)/test_cgroup_storage: cgroup_helpers.c
diff --git a/tools/testing/selftests/bpf/test_tcpbpf_user.c b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
similarity index 70%
rename from tools/testing/selftests/bpf/test_tcpbpf_user.c
rename to tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
index 74a9e49988b6..54f1dce97729 100644
--- a/tools/testing/selftests/bpf/test_tcpbpf_user.c
+++ b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
@@ -1,28 +1,18 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <inttypes.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <linux/bpf.h>
-#include <sys/types.h>
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-
-#include "bpf_rlimit.h"
-#include "bpf_util.h"
-#include "cgroup_helpers.h"
+#include <test_progs.h>
 
 #include "test_tcpbpf.h"
 
+#define CG_NAME "/tcpbpf-user-test"
+
 /* 3 comes from one listening socket + both ends of the connection */
 #define EXPECTED_CLOSE_EVENTS		3
 
 #define EXPECT_EQ(expected, actual, fmt)			\
 	do {							\
 		if ((expected) != (actual)) {			\
-			printf("  Value of: " #actual "\n"	\
+			fprintf(stderr, "  Value of: " #actual "\n"	\
 			       "    Actual: %" fmt "\n"		\
 			       "  Expected: %" fmt "\n",	\
 			       (actual), (expected));		\
@@ -76,25 +66,11 @@ int verify_sockopt_result(int sock_map_fd)
 	return ret;
 }
 
-static int bpf_find_map(const char *test, struct bpf_object *obj,
-			const char *name)
-{
-	struct bpf_map *map;
-
-	map = bpf_object__find_map_by_name(obj, name);
-	if (!map) {
-		printf("%s:FAIL:map '%s' not found\n", test, name);
-		return -1;
-	}
-	return bpf_map__fd(map);
-}
-
-int main(int argc, char **argv)
+void test_tcpbpf_user(void)
 {
 	const char *file = "test_tcpbpf_kern.o";
 	int prog_fd, map_fd, sock_map_fd;
 	struct tcpbpf_globals g = {0};
-	const char *cg_path = "/foo";
 	int error = EXIT_FAILURE;
 	struct bpf_object *obj;
 	int cg_fd = -1;
@@ -102,24 +78,24 @@ int main(int argc, char **argv)
 	__u32 key = 0;
 	int rv;
 
-	cg_fd = cgroup_setup_and_join(cg_path);
+	cg_fd = test__join_cgroup(CG_NAME);
 	if (cg_fd < 0)
 		goto err;
 
 	if (bpf_prog_load(file, BPF_PROG_TYPE_SOCK_OPS, &obj, &prog_fd)) {
-		printf("FAILED: load_bpf_file failed for: %s\n", file);
+		fprintf(stderr, "FAILED: load_bpf_file failed for: %s\n", file);
 		goto err;
 	}
 
 	rv = bpf_prog_attach(prog_fd, cg_fd, BPF_CGROUP_SOCK_OPS, 0);
 	if (rv) {
-		printf("FAILED: bpf_prog_attach: %d (%s)\n",
-		       error, strerror(errno));
+		fprintf(stderr, "FAILED: bpf_prog_attach: %d (%s)\n",
+		       errno, strerror(errno));
 		goto err;
 	}
 
 	if (system("./tcp_server.py")) {
-		printf("FAILED: TCP server\n");
+		fprintf(stderr, "FAILED: TCP server\n");
 		goto err;
 	}
 
@@ -134,32 +110,33 @@ int main(int argc, char **argv)
 retry_lookup:
 	rv = bpf_map_lookup_elem(map_fd, &key, &g);
 	if (rv != 0) {
-		printf("FAILED: bpf_map_lookup_elem returns %d\n", rv);
+		fprintf(stderr, "FAILED: bpf_map_lookup_elem returns %d\n", rv);
 		goto err;
 	}
 
 	if (g.num_close_events != EXPECTED_CLOSE_EVENTS && retry--) {
-		printf("Unexpected number of close events (%d), retrying!\n",
-		       g.num_close_events);
+		fprintf(stderr,
+			"Unexpected number of close events (%d), retrying!\n",
+			g.num_close_events);
 		usleep(100);
 		goto retry_lookup;
 	}
 
 	if (verify_result(&g)) {
-		printf("FAILED: Wrong stats\n");
+		fprintf(stderr, "FAILED: Wrong stats\n");
 		goto err;
 	}
 
 	if (verify_sockopt_result(sock_map_fd)) {
-		printf("FAILED: Wrong sockopt stats\n");
+		fprintf(stderr, "FAILED: Wrong sockopt stats\n");
 		goto err;
 	}
 
-	printf("PASSED!\n");
 	error = 0;
 err:
 	bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
-	close(cg_fd);
-	cleanup_cgroup_environment();
-	return error;
+	if (cg_fd != -1)
+		close(cg_fd);
+
+	CHECK_FAIL(error);
 }