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selftests/bpf: Add a test for maximum packet size in xdp_do_redirect

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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
This commit is contained in:
Toke Høiland-Jørgensen
2022-03-10 23:56:21 +01:00
committed by Daniel Borkmann
parent b6f1f780b3
commit c09df4bd3a
1 changed files with 24 additions and 0 deletions
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24
tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
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@@ -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: