tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c
Extension
.c
Size
4517 bytes
Lines
162
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct meta {
	int ifindex;
	int pkt_len;
};

struct test_ctx_s {
	bool passed;
	int pkt_size;
};

struct test_ctx_s test_ctx;

static void on_sample(void *ctx, int cpu, void *data, __u32 size)
{
	struct meta *meta = (struct meta *)data;
	struct ipv4_packet *trace_pkt_v4 = data + sizeof(*meta);
	unsigned char *raw_pkt = data + sizeof(*meta);
	struct test_ctx_s *tst_ctx = ctx;

	ASSERT_GE(size, sizeof(pkt_v4) + sizeof(*meta), "check_size");
	ASSERT_EQ(meta->ifindex, if_nametoindex("lo"), "check_meta_ifindex");
	ASSERT_EQ(meta->pkt_len, tst_ctx->pkt_size, "check_meta_pkt_len");
	ASSERT_EQ(memcmp(trace_pkt_v4, &pkt_v4, sizeof(pkt_v4)), 0,
		  "check_packet_content");

	if (meta->pkt_len > sizeof(pkt_v4)) {
		for (int i = 0; i < meta->pkt_len - sizeof(pkt_v4); i++)
			ASSERT_EQ(raw_pkt[i + sizeof(pkt_v4)], (unsigned char)i,
				  "check_packet_content");
	}

	tst_ctx->passed = true;
}

#define BUF_SZ	9000

static void run_xdp_bpf2bpf_pkt_size(int pkt_fd, struct perf_buffer *pb,
				     struct test_xdp_bpf2bpf *ftrace_skel,
				     int pkt_size)
{
	__u8 *buf, *buf_in;
	int err;
	LIBBPF_OPTS(bpf_test_run_opts, topts);

	if (!ASSERT_LE(pkt_size, BUF_SZ, "pkt_size") ||
	    !ASSERT_GE(pkt_size, sizeof(pkt_v4), "pkt_size"))
		return;

	buf_in = malloc(BUF_SZ);
	if (!ASSERT_OK_PTR(buf_in, "buf_in malloc()"))
		return;

	buf = malloc(BUF_SZ);
	if (!ASSERT_OK_PTR(buf, "buf malloc()")) {
		free(buf_in);
		return;
	}

	test_ctx.passed = false;
	test_ctx.pkt_size = pkt_size;

	memcpy(buf_in, &pkt_v4, sizeof(pkt_v4));
	if (pkt_size > sizeof(pkt_v4)) {
		for (int i = 0; i < (pkt_size - sizeof(pkt_v4)); i++)
			buf_in[i + sizeof(pkt_v4)] = i;
	}

	/* Run test program */
	topts.data_in = buf_in;
	topts.data_size_in = pkt_size;
	topts.data_out = buf;
	topts.data_size_out = BUF_SZ;

	err = bpf_prog_test_run_opts(pkt_fd, &topts);

	ASSERT_OK(err, "ipv4");
	ASSERT_EQ(topts.retval, XDP_PASS, "ipv4 retval");
	ASSERT_EQ(topts.data_size_out, pkt_size, "ipv4 size");

	/* Make sure bpf_xdp_output() was triggered and it sent the expected
	 * data to the perf ring buffer.
	 */
	err = perf_buffer__poll(pb, 100);

	ASSERT_GE(err, 0, "perf_buffer__poll");
	ASSERT_TRUE(test_ctx.passed, "test passed");
	/* Verify test results */
	ASSERT_EQ(ftrace_skel->bss->test_result_fentry, if_nametoindex("lo"),
		  "fentry result");
	ASSERT_EQ(ftrace_skel->bss->test_result_fexit, XDP_PASS, "fexit result");

Annotation

Implementation Notes