diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c new file mode 100644 index 000000000..76967d8ac --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/xdp_bpf2bpf.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <test_progs.h> +#include <network_helpers.h> +#include <net/if.h> +#include "test_xdp.skel.h" +#include "test_xdp_bpf2bpf.skel.h" + +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"); + + free(buf); + free(buf_in); +} + +void test_xdp_bpf2bpf(void) +{ + int err, pkt_fd, map_fd; + int pkt_sizes[] = {sizeof(pkt_v4), 1024, 4100, 8200}; + struct iptnl_info value4 = {.family = AF_INET6}; + struct test_xdp *pkt_skel = NULL; + struct test_xdp_bpf2bpf *ftrace_skel = NULL; + struct vip key4 = {.protocol = 6, .family = AF_INET}; + struct bpf_program *prog; + struct perf_buffer *pb = NULL; + + /* Load XDP program to introspect */ + pkt_skel = test_xdp__open_and_load(); + if (!ASSERT_OK_PTR(pkt_skel, "test_xdp__open_and_load")) + return; + + pkt_fd = bpf_program__fd(pkt_skel->progs._xdp_tx_iptunnel); + + map_fd = bpf_map__fd(pkt_skel->maps.vip2tnl); + bpf_map_update_elem(map_fd, &key4, &value4, 0); + + /* Load trace program */ + ftrace_skel = test_xdp_bpf2bpf__open(); + if (!ASSERT_OK_PTR(ftrace_skel, "test_xdp_bpf2bpf__open")) + goto out; + + /* Demonstrate the bpf_program__set_attach_target() API rather than + * the load with options, i.e. opts.attach_prog_fd. + */ + prog = ftrace_skel->progs.trace_on_entry; + bpf_program__set_expected_attach_type(prog, BPF_TRACE_FENTRY); + bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel"); + + prog = ftrace_skel->progs.trace_on_exit; + bpf_program__set_expected_attach_type(prog, BPF_TRACE_FEXIT); + bpf_program__set_attach_target(prog, pkt_fd, "_xdp_tx_iptunnel"); + + err = test_xdp_bpf2bpf__load(ftrace_skel); + if (!ASSERT_OK(err, "test_xdp_bpf2bpf__load")) + goto out; + + err = test_xdp_bpf2bpf__attach(ftrace_skel); + if (!ASSERT_OK(err, "test_xdp_bpf2bpf__attach")) + goto out; + + /* Set up perf buffer */ + pb = perf_buffer__new(bpf_map__fd(ftrace_skel->maps.perf_buf_map), 8, + on_sample, NULL, &test_ctx, NULL); + if (!ASSERT_OK_PTR(pb, "perf_buf__new")) + goto out; + + for (int i = 0; i < ARRAY_SIZE(pkt_sizes); i++) + run_xdp_bpf2bpf_pkt_size(pkt_fd, pb, ftrace_skel, + pkt_sizes[i]); +out: + perf_buffer__free(pb); + test_xdp__destroy(pkt_skel); + test_xdp_bpf2bpf__destroy(ftrace_skel); +} |