[PATCH bpf-next v2 0/4] use network helpers, part 5

[PATCH bpf-next v2 0/4] use network helpers, part 5

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patchset uses post_socket_cb and post_connect_cb callbacks of struct
network_helper_opts to refactor do_test() in bpf_tcp_ca.c to move dctcp
test dedicated code out of do_test() into test_dctcp().

Patch 3 adds a new member in post_socket_opts and patch 4 adds a new
callback in network_helper_opts. I'm not sure if this is going too far.

v2:
 - rebased on commit "selftests/bpf: Add test for the use of new args in
 cong_control"

Geliang Tang (4):
  selftests/bpf: Use post_socket_cb in connect_to_fd_opts
  selftests/bpf: Use start_server_addr in bpf_tcp_ca
  selftests/bpf: Use connect_to_fd_opts in do_test in bpf_tcp_ca
  selftests/bpf: Add post_connect_cb callback

 tools/testing/selftests/bpf/network_helpers.c |  13 +-
 tools/testing/selftests/bpf/network_helpers.h |   8 +-
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 111 ++++++++++++------
 3 files changed, 86 insertions(+), 46 deletions(-)

-- 
2.43.0

[PATCH bpf-next v2 1/4] selftests/bpf: Use post_socket_cb in connect_to_fd_opts

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

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@kylinos.cn>
---
 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 0aca02532794..9bc909fa0833 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -81,6 +81,12 @@ 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;
@@ -172,7 +178,8 @@ 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

Re: [PATCH bpf-next v2 1/4] selftests/bpf: Use post_socket_cb in connect_to_fd_opts

[Martin KaFai Lau]

On 5/14/24 9:20 PM, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> 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@kylinos.cn>
> ---
>   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;
> +};

 From looking its usage in this set, it has cc name and map fd in it. It becomes 
clear that it is not possible to have one generic/common "struct 
post_socket_opts" for all tests.

>   
>   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;

It is better to have the individual test define its own callback opts struct. 
Something like this:

/* network_helpers.h */
struct network_helper_opts {
	/* ... */
	int (*post_socket_cb)(int fd, void *opts);
	void *post_socket_opts;
};

/* bpf_tcp_ca.c */
struct cb_opts {
	const char *cc;
	int map_fd;
};

struct cb_opts cb_opts = {
	.cc = "bpf_dctcp",
	.map_fd = fd,
};

struct network_helper_opts opts = {
	.post_socket_cb = stg_post_socket_cb,
	.post_sock_opts = &cb_opts,
};

pw-bot: cr

>   };
>   
>   /* 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..9bc909fa0833 100644
> --- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
> +++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
> @@ -81,6 +81,12 @@ 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;
> @@ -172,7 +178,8 @@ 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;

[PATCH bpf-next v2 2/4] selftests/bpf: Use start_server_addr in bpf_tcp_ca

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch uses start_server_addr() in do_test() in prog_tests/bpf_tcp_ca.c
to accept a struct network_helper_opts argument instead of using
start_server() and settcpca(). Then change the type of the first paramenter
of do_test() into a struct network_helper_opts one.

Define its own opts for each test, set its own cc name into cb_opts.cc, and
cc_cb() into post_socket_cb callback, then pass it to do_test().

opts->cb_opts needs to be passed to post_socket_cb() in __start_server().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 tools/testing/selftests/bpf/network_helpers.c |  2 +-
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 52 +++++++++++++++----
 2 files changed, 42 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index d97f8a669b38..6864af665508 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -94,7 +94,7 @@ static int __start_server(int type, const struct sockaddr *addr, socklen_t addrl
 	if (settimeo(fd, opts->timeout_ms))
 		goto error_close;
 
-	if (opts->post_socket_cb && opts->post_socket_cb(fd, NULL)) {
+	if (opts->post_socket_cb && opts->post_socket_cb(fd, &opts->cb_opts)) {
 		log_err("Failed to call post_socket_cb");
 		goto error_close;
 	}
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 9bc909fa0833..25961ce850cb 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -34,12 +34,18 @@ static int settcpca(int fd, const char *tcp_ca)
 	return 0;
 }
 
-static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
+static void do_test(const struct network_helper_opts *opts,
+		    const struct bpf_map *sk_stg_map)
 {
+	struct sockaddr_storage addr;
 	int lfd = -1, fd = -1;
+	socklen_t addrlen;
 	int err;
 
-	lfd = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
+	if (make_sockaddr(AF_INET6, NULL, 0, &addr, &addrlen))
+		return;
+
+	lfd = start_server_addr(SOCK_STREAM, &addr, addrlen, opts);
 	if (!ASSERT_NEQ(lfd, -1, "socket"))
 		return;
 
@@ -49,7 +55,7 @@ static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 		return;
 	}
 
-	if (settcpca(lfd, tcp_ca) || settcpca(fd, tcp_ca))
+	if (settcpca(fd, opts->cb_opts.cc))
 		goto done;
 
 	if (sk_stg_map) {
@@ -89,6 +95,10 @@ static int cc_cb(int fd, const struct post_socket_opts *opts)
 
 static void test_cubic(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "bpf_cubic",
+		.post_socket_cb = cc_cb,
+	};
 	struct bpf_cubic *cubic_skel;
 	struct bpf_link *link;
 
@@ -102,7 +112,7 @@ static void test_cubic(void)
 		return;
 	}
 
-	do_test("bpf_cubic", NULL);
+	do_test(&opts, NULL);
 
 	ASSERT_EQ(cubic_skel->bss->bpf_cubic_acked_called, 1, "pkts_acked called");
 
@@ -112,6 +122,10 @@ static void test_cubic(void)
 
 static void test_dctcp(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "bpf_dctcp",
+		.post_socket_cb = cc_cb,
+	};
 	struct bpf_dctcp *dctcp_skel;
 	struct bpf_link *link;
 
@@ -125,7 +139,7 @@ static void test_dctcp(void)
 		return;
 	}
 
-	do_test("bpf_dctcp", dctcp_skel->maps.sk_stg_map);
+	do_test(&opts, dctcp_skel->maps.sk_stg_map);
 	ASSERT_EQ(dctcp_skel->bss->stg_result, expected_stg, "stg_result");
 
 	bpf_link__destroy(link);
@@ -304,6 +318,10 @@ static void test_unsupp_cong_op(void)
 
 static void test_update_ca(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "tcp_ca_update",
+		.post_socket_cb = cc_cb,
+	};
 	struct tcp_ca_update *skel;
 	struct bpf_link *link;
 	int saved_ca1_cnt;
@@ -316,14 +334,14 @@ static void test_update_ca(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test("tcp_ca_update", NULL);
+	do_test(&opts, NULL);
 	saved_ca1_cnt = skel->bss->ca1_cnt;
 	ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_update_2);
 	ASSERT_OK(err, "update_map");
 
-	do_test("tcp_ca_update", NULL);
+	do_test(&opts, NULL);
 	ASSERT_EQ(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
 	ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt");
 
@@ -333,6 +351,10 @@ static void test_update_ca(void)
 
 static void test_update_wrong(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "tcp_ca_update",
+		.post_socket_cb = cc_cb,
+	};
 	struct tcp_ca_update *skel;
 	struct bpf_link *link;
 	int saved_ca1_cnt;
@@ -345,14 +367,14 @@ static void test_update_wrong(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test("tcp_ca_update", NULL);
+	do_test(&opts, NULL);
 	saved_ca1_cnt = skel->bss->ca1_cnt;
 	ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_wrong);
 	ASSERT_ERR(err, "update_map");
 
-	do_test("tcp_ca_update", NULL);
+	do_test(&opts, NULL);
 	ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
 
 	bpf_link__destroy(link);
@@ -361,6 +383,10 @@ static void test_update_wrong(void)
 
 static void test_mixed_links(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "tcp_ca_update",
+		.post_socket_cb = cc_cb,
+	};
 	struct tcp_ca_update *skel;
 	struct bpf_link *link, *link_nl;
 	int err;
@@ -375,7 +401,7 @@ static void test_mixed_links(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test("tcp_ca_update", NULL);
+	do_test(&opts, NULL);
 	ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_no_link);
@@ -462,6 +488,10 @@ static void test_tcp_ca_kfunc(void)
 
 static void test_cc_cubic(void)
 {
+	struct network_helper_opts opts = {
+		.cb_opts.cc = "bpf_cc_cubic",
+		.post_socket_cb = cc_cb,
+	};
 	struct bpf_cc_cubic *cc_cubic_skel;
 	struct bpf_link *link;
 
@@ -475,7 +505,7 @@ static void test_cc_cubic(void)
 		return;
 	}
 
-	do_test("bpf_cc_cubic", NULL);
+	do_test(&opts, NULL);
 
 	bpf_link__destroy(link);
 	bpf_cc_cubic__destroy(cc_cubic_skel);
-- 
2.43.0

Re: [PATCH bpf-next v2 2/4] selftests/bpf: Use start_server_addr in bpf_tcp_ca

[Martin KaFai Lau]

On 5/14/24 9:20 PM, Geliang Tang wrote:
> From: Geliang Tang <tanggeliang@kylinos.cn>
> 
> This patch uses start_server_addr() in do_test() in prog_tests/bpf_tcp_ca.c
> to accept a struct network_helper_opts argument instead of using
> start_server() and settcpca(). Then change the type of the first paramenter
> of do_test() into a struct network_helper_opts one.
> 
> Define its own opts for each test, set its own cc name into cb_opts.cc, and
> cc_cb() into post_socket_cb callback, then pass it to do_test().
> 
> opts->cb_opts needs to be passed to post_socket_cb() in __start_server().
> 
> Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
> ---
>   tools/testing/selftests/bpf/network_helpers.c |  2 +-
>   .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 52 +++++++++++++++----
>   2 files changed, 42 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
> index d97f8a669b38..6864af665508 100644
> --- a/tools/testing/selftests/bpf/network_helpers.c
> +++ b/tools/testing/selftests/bpf/network_helpers.c
> @@ -94,7 +94,7 @@ static int __start_server(int type, const struct sockaddr *addr, socklen_t addrl
>   	if (settimeo(fd, opts->timeout_ms))
>   		goto error_close;
>   
> -	if (opts->post_socket_cb && opts->post_socket_cb(fd, NULL)) {
> +	if (opts->post_socket_cb && opts->post_socket_cb(fd, &opts->cb_opts)) {
>   		log_err("Failed to call post_socket_cb");
>   		goto error_close;
>   	}
> 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 9bc909fa0833..25961ce850cb 100644
> --- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
> +++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
> @@ -34,12 +34,18 @@ static int settcpca(int fd, const char *tcp_ca)
>   	return 0;
>   }
>   
> -static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
> +static void do_test(const struct network_helper_opts *opts,
> +		    const struct bpf_map *sk_stg_map)
>   {
> +	struct sockaddr_storage addr;
>   	int lfd = -1, fd = -1;
> +	socklen_t addrlen;
>   	int err;
>   
> -	lfd = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
> +	if (make_sockaddr(AF_INET6, NULL, 0, &addr, &addrlen))
> +		return;
> +
> +	lfd = start_server_addr(SOCK_STREAM, &addr, addrlen, opts);

It is a tech debt that start_server does not take the "opts" argument.
It is pretty handy to have start_server as a helper that takes string address.

How about create a start_server_str() and start using it in this set. The other 
existing start_server() usages can be retired later.

int start_server_str(int family, int type, const char *addr, __u16 port,
		     const struct network_helper_opts *opts);

[PATCH bpf-next v2 3/4] selftests/bpf: Use connect_to_fd_opts in do_test in bpf_tcp_ca

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

This patch uses connect_to_fd_opts() instead of using connect_fd_to_fd()
and settcpca() in do_test() in prog_tests/bpf_tcp_ca.c to accept a struct
network_helper_opts argument.

Then define a dctcp dedicated post_socket_cb callback stg_post_socket_cb(),
invoking both cc_cb() and bpf_map_update_elem() in it, and set it in
test_dctcp(). For passing map_fd into stg_post_socket_cb() callback, a new
member map_fd is added in struct post_socket_opts.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 tools/testing/selftests/bpf/network_helpers.h |  1 +
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 33 ++++++++-----------
 2 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index e44a6e5d8344..62dd40095cf2 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -23,6 +23,7 @@ typedef __u16 __sum16;
 
 struct post_socket_opts {
 	const char *cc;
+	int map_fd;
 };
 
 struct network_helper_opts {
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 25961ce850cb..7c9c79e35551 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -49,25 +49,9 @@ static void do_test(const struct network_helper_opts *opts,
 	if (!ASSERT_NEQ(lfd, -1, "socket"))
 		return;
 
-	fd = socket(AF_INET6, SOCK_STREAM, 0);
-	if (!ASSERT_NEQ(fd, -1, "socket")) {
-		close(lfd);
-		return;
-	}
-
-	if (settcpca(fd, opts->cb_opts.cc))
-		goto done;
-
-	if (sk_stg_map) {
-		err = bpf_map_update_elem(bpf_map__fd(sk_stg_map), &fd,
-					  &expected_stg, BPF_NOEXIST);
-		if (!ASSERT_OK(err, "bpf_map_update_elem(sk_stg_map)"))
-			goto done;
-	}
-
 	/* connect to server */
-	err = connect_fd_to_fd(fd, lfd, 0);
-	if (!ASSERT_NEQ(err, -1, "connect"))
+	fd = connect_to_fd_opts(lfd, opts);
+	if (!ASSERT_NEQ(fd, -1, "connect_to_fd_opts"))
 		goto done;
 
 	if (sk_stg_map) {
@@ -120,11 +104,21 @@ static void test_cubic(void)
 	bpf_cubic__destroy(cubic_skel);
 }
 
+static int stg_post_socket_cb(int fd, const struct post_socket_opts *opts)
+{
+	int err;
+
+	err = cc_cb(fd, opts);
+	if (err)
+		return err;
+	return bpf_map_update_elem(opts->map_fd, &fd, &expected_stg, BPF_NOEXIST);
+}
+
 static void test_dctcp(void)
 {
 	struct network_helper_opts opts = {
 		.cb_opts.cc = "bpf_dctcp",
-		.post_socket_cb = cc_cb,
+		.post_socket_cb = stg_post_socket_cb,
 	};
 	struct bpf_dctcp *dctcp_skel;
 	struct bpf_link *link;
@@ -139,6 +133,7 @@ static void test_dctcp(void)
 		return;
 	}
 
+	opts.cb_opts.map_fd = bpf_map__fd(dctcp_skel->maps.sk_stg_map);
 	do_test(&opts, dctcp_skel->maps.sk_stg_map);
 	ASSERT_EQ(dctcp_skel->bss->stg_result, expected_stg, "stg_result");
 
-- 
2.43.0

[PATCH bpf-next v2 4/4] selftests/bpf: Add post_connect_cb callback

[Geliang Tang]

From: Geliang Tang <tanggeliang@kylinos.cn>

For getting rid of the second parameter of do_test(), this patch adds a
new callback post_connect_cb in struct network_helper_opts, it will be
invoked after connect_fd_to_addr() in connect_to_fd_opts().

Then define a dctcp dedicated post_connect_cb callback, invoking
bpf_map_lookup_elem() in it, named stg_post_connect_cb() and set it in
test_dctcp().

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 tools/testing/selftests/bpf/network_helpers.c |  6 ++-
 tools/testing/selftests/bpf/network_helpers.h |  1 +
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 43 ++++++++++---------
 3 files changed, 28 insertions(+), 22 deletions(-)

diff --git a/tools/testing/selftests/bpf/network_helpers.c b/tools/testing/selftests/bpf/network_helpers.c
index 6864af665508..5636488dfb42 100644
--- a/tools/testing/selftests/bpf/network_helpers.c
+++ b/tools/testing/selftests/bpf/network_helpers.c
@@ -342,10 +342,14 @@ int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
 	    opts->post_socket_cb(fd, &opts->cb_opts))
 		goto error_close;
 
-	if (!opts->noconnect)
+	if (!opts->noconnect) {
 		if (connect_fd_to_addr(fd, &addr, addrlen, opts->must_fail))
 			goto error_close;
 
+		if (opts->post_connect_cb && opts->post_connect_cb(fd, &opts->cb_opts))
+			goto error_close;
+	}
+
 	return fd;
 
 error_close:
diff --git a/tools/testing/selftests/bpf/network_helpers.h b/tools/testing/selftests/bpf/network_helpers.h
index 62dd40095cf2..0c8859651e7a 100644
--- a/tools/testing/selftests/bpf/network_helpers.h
+++ b/tools/testing/selftests/bpf/network_helpers.h
@@ -33,6 +33,7 @@ struct network_helper_opts {
 	int type;
 	int proto;
 	int (*post_socket_cb)(int fd, const struct post_socket_opts *opts);
+	int (*post_connect_cb)(int fd, const struct post_socket_opts *opts);
 	struct post_socket_opts cb_opts;
 };
 
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 7c9c79e35551..05bcdb4830fa 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -34,13 +34,11 @@ static int settcpca(int fd, const char *tcp_ca)
 	return 0;
 }
 
-static void do_test(const struct network_helper_opts *opts,
-		    const struct bpf_map *sk_stg_map)
+static void do_test(const struct network_helper_opts *opts)
 {
 	struct sockaddr_storage addr;
 	int lfd = -1, fd = -1;
 	socklen_t addrlen;
-	int err;
 
 	if (make_sockaddr(AF_INET6, NULL, 0, &addr, &addrlen))
 		return;
@@ -54,16 +52,6 @@ static void do_test(const struct network_helper_opts *opts,
 	if (!ASSERT_NEQ(fd, -1, "connect_to_fd_opts"))
 		goto done;
 
-	if (sk_stg_map) {
-		int tmp_stg;
-
-		err = bpf_map_lookup_elem(bpf_map__fd(sk_stg_map), &fd,
-					  &tmp_stg);
-		if (!ASSERT_ERR(err, "bpf_map_lookup_elem(sk_stg_map)") ||
-				!ASSERT_EQ(errno, ENOENT, "bpf_map_lookup_elem(sk_stg_map)"))
-			goto done;
-	}
-
 	ASSERT_OK(send_recv_data(lfd, fd, total_bytes), "send_recv_data");
 
 done:
@@ -96,7 +84,7 @@ static void test_cubic(void)
 		return;
 	}
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 
 	ASSERT_EQ(cubic_skel->bss->bpf_cubic_acked_called, 1, "pkts_acked called");
 
@@ -114,11 +102,24 @@ static int stg_post_socket_cb(int fd, const struct post_socket_opts *opts)
 	return bpf_map_update_elem(opts->map_fd, &fd, &expected_stg, BPF_NOEXIST);
 }
 
+static int stg_post_connect_cb(int fd, const struct post_socket_opts *opts)
+{
+	int tmp_stg;
+	int err;
+
+	err = bpf_map_lookup_elem(opts->map_fd, &fd, &tmp_stg);
+	if (!ASSERT_ERR(err, "bpf_map_lookup_elem(sk_stg_map)") ||
+			!ASSERT_EQ(errno, ENOENT, "bpf_map_lookup_elem(sk_stg_map)"))
+		return err;
+	return 0;
+}
+
 static void test_dctcp(void)
 {
 	struct network_helper_opts opts = {
 		.cb_opts.cc = "bpf_dctcp",
 		.post_socket_cb = stg_post_socket_cb,
+		.post_connect_cb = stg_post_connect_cb,
 	};
 	struct bpf_dctcp *dctcp_skel;
 	struct bpf_link *link;
@@ -134,7 +135,7 @@ static void test_dctcp(void)
 	}
 
 	opts.cb_opts.map_fd = bpf_map__fd(dctcp_skel->maps.sk_stg_map);
-	do_test(&opts, dctcp_skel->maps.sk_stg_map);
+	do_test(&opts);
 	ASSERT_EQ(dctcp_skel->bss->stg_result, expected_stg, "stg_result");
 
 	bpf_link__destroy(link);
@@ -329,14 +330,14 @@ static void test_update_ca(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 	saved_ca1_cnt = skel->bss->ca1_cnt;
 	ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_update_2);
 	ASSERT_OK(err, "update_map");
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 	ASSERT_EQ(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
 	ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt");
 
@@ -362,14 +363,14 @@ static void test_update_wrong(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 	saved_ca1_cnt = skel->bss->ca1_cnt;
 	ASSERT_GT(saved_ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_wrong);
 	ASSERT_ERR(err, "update_map");
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 	ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt");
 
 	bpf_link__destroy(link);
@@ -396,7 +397,7 @@ static void test_mixed_links(void)
 	link = bpf_map__attach_struct_ops(skel->maps.ca_update_1);
 	ASSERT_OK_PTR(link, "attach_struct_ops");
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 	ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt");
 
 	err = bpf_link__update_map(link, skel->maps.ca_no_link);
@@ -500,7 +501,7 @@ static void test_cc_cubic(void)
 		return;
 	}
 
-	do_test(&opts, NULL);
+	do_test(&opts);
 
 	bpf_link__destroy(link);
 	bpf_cc_cubic__destroy(cc_cubic_skel);
-- 
2.43.0