Squash to "selftests/bpf: Add bpf scheduler test" - drop has_bytes_sent

Drop ss_search() and has_bytes_sent(), add a new bpf program to check
the bytes_sent.

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Message-Id: <bae090f6945a2621f9ed4de2cb0e29d772a0e760.1725948163.git.tanggeliang@kylinos.cn>

tools/testing/selftests/bpf/prog_tests/mptcp.c

@@ -10,6 +10,7 @@
 #include "mptcp_sock.skel.h"
 #include "mptcpify.skel.h"
 #include "mptcp_subflow.skel.h"
+#include "mptcp_bpf_bytes.skel.h"
 #include "mptcp_bpf_first.skel.h"
 #include "mptcp_bpf_bkup.skel.h"
 #include "mptcp_bpf_rr.skel.h"
@@ -489,56 +490,59 @@ static struct nstoken *sched_init(char *flags, char *sched)
 	return NULL;
 }
 
-static int ss_search(char *src, char *dst, char *port, char *keyword)
-{
-	return SYS_NOFAIL("ip netns exec %s ss -enita src %s dst %s %s %d | grep -q '%s'",
-			  NS_TEST, src, dst, port, PORT_1, keyword);
-}
-
-static int has_bytes_sent(char *dst)
-{
-	return ss_search(ADDR_1, dst, "sport", "bytes_sent:");
-}
-
 static void send_data_and_verify(char *sched, bool addr1, bool addr2)
 {
+	int server_fd, client_fd, err;
+	struct mptcp_bpf_bytes *skel;
 	struct timespec start, end;
-	int server_fd, client_fd;
 	unsigned int delta_ms;
 
+	skel = mptcp_bpf_bytes__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "open_and_load: bytes"))
+		return;
+
+	skel->bss->pid = getpid();
+
+	err = mptcp_bpf_bytes__attach(skel);
+	if (!ASSERT_OK(err, "skel_attach: bytes"))
+		goto skel_destroy;
+
 	server_fd = start_mptcp_server(AF_INET, ADDR_1, PORT_1, 0);
 	if (!ASSERT_OK_FD(server_fd, "start_mptcp_server"))
-		return;
+		goto skel_destroy;
 
 	client_fd = connect_to_fd(server_fd, 0);
 	if (!ASSERT_OK_FD(client_fd, "connect_to_fd"))
-		goto fail;
+		goto close_server;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &start) < 0)
-		goto fail;
+		goto close_client;
 
 	if (!ASSERT_OK(send_recv_data(server_fd, client_fd, total_bytes),
 		       "send_recv_data"))
-		goto fail;
+		goto close_client;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &end) < 0)
-		goto fail;
+		goto close_client;
 
 	delta_ms = (end.tv_sec - start.tv_sec) * 1000 + (end.tv_nsec - start.tv_nsec) / 1000000;
 	printf("%s: %u ms\n", sched, delta_ms);
 
 	if (addr1)
-		CHECK(has_bytes_sent(ADDR_1), sched, "should have bytes_sent on addr1\n");
+		ASSERT_GT(skel->bss->bytes_sent_1, 0, "should have bytes_sent on addr1");
 	else
-		CHECK(!has_bytes_sent(ADDR_1), sched, "shouldn't have bytes_sent on addr1\n");
+		ASSERT_EQ(skel->bss->bytes_sent_1, 0, "shouldn't have bytes_sent on addr1");
 	if (addr2)
-		CHECK(has_bytes_sent(ADDR_2), sched, "should have bytes_sent on addr2\n");
+		ASSERT_GT(skel->bss->bytes_sent_2, 0, "should have bytes_sent on addr2");
 	else
-		CHECK(!has_bytes_sent(ADDR_2), sched, "shouldn't have bytes_sent on addr2\n");
+		ASSERT_EQ(skel->bss->bytes_sent_2, 0, "shouldn't have bytes_sent on addr2");
 
+close_client:
 	close(client_fd);
-fail:
+close_server:
 	close(server_fd);
+skel_destroy:
+	mptcp_bpf_bytes__destroy(skel);
 }
 
 static void test_default(void)

tools/testing/selftests/bpf/progs/mptcp_bpf_bytes.c

@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024, Kylin Software */
+
+/* vmlinux.h, bpf_helpers.h and other 'define' */
+#include "bpf_tracing_net.h"
+#include "mptcp_bpf.h"
+
+char _license[] SEC("license") = "GPL";
+unsigned int bytes_sent_1 = 0;
+unsigned int bytes_sent_2 = 0;
+int pid;
+
+SEC("fentry/mptcp_sched_get_send")
+int BPF_PROG(trace_mptcp_sched_get_send, struct mptcp_sock *msk)
+{
+	struct mptcp_subflow_context *subflow;
+
+	if (bpf_get_current_pid_tgid() >> 32 != pid)
+		return 0;
+
+	mptcp_for_each_subflow(msk, subflow) {
+		struct tcp_sock *tsk;
+		struct sock *ssk;
+
+		subflow = bpf_core_cast(subflow, struct mptcp_subflow_context);
+		ssk = mptcp_subflow_tcp_sock(subflow);
+		tsk = bpf_core_cast(ssk, struct tcp_sock);
+
+		if (subflow->subflow_id == 1)
+			bytes_sent_1 += tsk->bytes_sent;
+		else if (subflow->subflow_id == 2)
+			bytes_sent_2 += tsk->bytes_sent;
+	}
+
+	return 0;
+}