[PATCH bpf-next 1/4] selftests/bpf: Use post_socket_cb in connect_to_fd_opts

[Geliang Tang <geliang@xxxxxxxxxx>]

From: Geliang Tang <tanggeliang@xxxxxxxxxx>

Since the post_socket_cb() callback is added in struct network_helper_opts,
it's make sense to use it not only in __start_server(), but also in
connect_to_fd_opts(). Then it can be used to set TCP_CONGESTION sockopt.

Add a post_socket_opts type member cb_opts into struct network_helper_opts,
then cc can be moved into struct post_socket_opts from network_helper_opts.
Define a new callback cc_cb() to set TCP_CONGESTION sockopt, and set it to
post_socket_cb pointer.

Signed-off-by: Geliang Tang <tanggeliang@xxxxxxxxxx>
---
 tools/testing/selftests/bpf/network_helpers.c       | 5 ++---
 tools/testing/selftests/bpf/network_helpers.h       | 6 ++++--
 tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c | 9 ++++++++-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 35250e6cde7f..d97f8a669b38 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -338,9 +338,8 @@ int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
 	if (settimeo(fd, opts->timeout_ms))
 		goto error_close;
 
-	if (opts->cc && opts->cc[0] &&
-	    setsockopt(fd, SOL_TCP, TCP_CONGESTION, opts->cc,
-		       strlen(opts->cc) + 1))
+	if (opts->post_socket_cb &&
+	    opts->post_socket_cb(fd, &opts->cb_opts))
 		goto error_close;
 
 	if (!opts->noconnect)
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 883c7ea9d8d5..e44a6e5d8344 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -21,16 +21,18 @@ typedef __u16 __sum16;
 #define VIP_NUM 5
 #define MAGIC_BYTES 123
 
-struct post_socket_opts {};
+struct post_socket_opts {
+	const char *cc;
+};
 
 struct network_helper_opts {
-	const char *cc;
 	int timeout_ms;
 	bool must_fail;
 	bool noconnect;
 	int type;
 	int proto;
 	int (*post_socket_cb)(int fd, const struct post_socket_opts *opts);
+	struct post_socket_opts cb_opts;
 };
 
 /* ipv4 test vector */
diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
index 907bac46c774..4eedc161b5b3 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -80,6 +80,12 @@ static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 	close(fd);
 }
 
+static int cc_cb(int fd, const struct post_socket_opts *opts)
+{
+	return setsockopt(fd, SOL_TCP, TCP_CONGESTION, opts->cc,
+			  strlen(opts->cc) + 1);
+}
+
 static void test_cubic(void)
 {
 	struct bpf_cubic *cubic_skel;
@@ -171,7 +177,8 @@ static void test_dctcp_fallback(void)
 {
 	int err, lfd = -1, cli_fd = -1, srv_fd = -1;
 	struct network_helper_opts opts = {
-		.cc = "cubic",
+		.cb_opts.cc = "cubic",
+		.post_socket_cb = cc_cb,
 	};
 	struct bpf_dctcp *dctcp_skel;
 	struct bpf_link *link = NULL;
-- 
2.43.0