[bpf-next,v4,3/6] selftests/bpf: Use post_socket_cb in connect_to_fd_opts

Commit Message

Geliang Tang May 24, 2024, 3:21 a.m. UTC

From: Geliang Tang <[e-mail]>

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 "void *" type member cb_opts into struct network_helper_opts, and add
a new struct named cb_opts in prog_tests/bpf_tcp_ca.c, then cc can be moved
into struct cb_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 <[e-mail]>
---
 tools/testing/selftests/bpf/network_helpers.c  |  5 ++---
 tools/testing/selftests/bpf/network_helpers.h  |  2 +-
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c      | 18 +++++++++++++++++-
 3 files changed, 20 insertions(+), 5 deletions(-)

Comments

Martin KaFai Lau May 24, 2024, 11:16 p.m. UTC | #1

On 5/23/24 8:21 PM, Geliang Tang wrote:
> +static int cc_cb(int fd, void *opts)
> +{
> +	struct cb_opts *cb_opts = (struct cb_opts *)opts;
> +
> +	return setsockopt(fd, SOL_TCP, TCP_CONGESTION, cb_opts->cc,
> +			  strlen(cb_opts->cc) + 1);

Since this cc_cb is in the test itself, it should use ASSERT_* such that the 
error output will be more useful. The same (use ASSERT_* whenever makes sense) 
goes for all cb functions in this set. In particular for the cb that does more 
than setsockopt in patch 5.

Patch

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 0e8266f439e4..8502917b6c7b 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -348,9 +348,8 @@  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 4e3e6afe7d3a..11eea8e2e4f1 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -22,13 +22,13 @@  typedef __u16 __sum16;
 #define MAGIC_BYTES 123
 
 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, void *opts);
+	void *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 0aca02532794..c9dd2a3d3218 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -23,6 +23,10 @@ 
 static const unsigned int total_bytes = 10 * 1024 * 1024;
 static int expected_stg = 0xeB9F;
 
+struct cb_opts {
+	const char *cc;
+};
+
 static int settcpca(int fd, const char *tcp_ca)
 {
 	int err;
@@ -81,6 +85,14 @@  static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 	close(fd);
 }
 
+static int cc_cb(int fd, void *opts)
+{
+	struct cb_opts *cb_opts = (struct cb_opts *)opts;
+
+	return setsockopt(fd, SOL_TCP, TCP_CONGESTION, cb_opts->cc,
+			  strlen(cb_opts->cc) + 1);
+}
+
 static void test_cubic(void)
 {
 	struct bpf_cubic *cubic_skel;
@@ -171,9 +183,13 @@  static void test_invalid_license(void)
 static void test_dctcp_fallback(void)
 {
 	int err, lfd = -1, cli_fd = -1, srv_fd = -1;
-	struct network_helper_opts opts = {
+	struct cb_opts cb_opts = {
 		.cc = "cubic",
 	};
+	struct network_helper_opts opts = {
+		.post_socket_cb	= cc_cb,
+		.cb_opts	= &cb_opts,
+	};
 	struct bpf_dctcp *dctcp_skel;
 	struct bpf_link *link = NULL;
 	char srv_cc[16];