diff options
| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2022-03-10 23:56:21 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-03-11 22:01:26 +0100 |
| commit | c09df4bd3a915079eec5e77160366225a28699a2 (patch) | |
| tree | 6b4c663fa5aefbc9f244f11e12e0b911112326ad | |
| parent | b6f1f780b3932ae497ed85e79bc8a1e513883624 (diff) | |
selftests/bpf: Add a test for maximum packet size in xdp_do_redirect
This adds an extra test to the xdp_do_redirect selftest for XDP live packet
mode, which verifies that the maximum permissible packet size is accepted
without any errors, and that a too big packet is correctly rejected.
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220310225621.53374-2-toke@redhat.com
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c index 9926b07e38c8..a50971c6cf4a 100644 --- a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c +++ b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c @@ -62,6 +62,28 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int fd) return 0; } +/* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) - + * sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3368 bytes + */ +#define MAX_PKT_SIZE 3368 +static void test_max_pkt_size(int fd) +{ + char data[MAX_PKT_SIZE + 1] = {}; + int err; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .data_in = &data, + .data_size_in = MAX_PKT_SIZE, + .flags = BPF_F_TEST_XDP_LIVE_FRAMES, + .repeat = 1, + ); + err = bpf_prog_test_run_opts(fd, &opts); + ASSERT_OK(err, "prog_run_max_size"); + + opts.data_size_in += 1; + err = bpf_prog_test_run_opts(fd, &opts); + ASSERT_EQ(err, -EINVAL, "prog_run_too_big"); +} + #define NUM_PKTS 10000 void test_xdp_do_redirect(void) { @@ -167,6 +189,8 @@ void test_xdp_do_redirect(void) ASSERT_EQ(skel->bss->pkts_seen_zero, 2, "pkt_count_zero"); ASSERT_EQ(skel->bss->pkts_seen_tc, NUM_PKTS - 2, "pkt_count_tc"); + test_max_pkt_size(bpf_program__fd(skel->progs.xdp_count_pkts)); + out_tc: bpf_tc_hook_destroy(&tc_hook); out: |