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selftests/bpf: Add tests for attaching XDP programs

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This adds tests for the various replacement operations using
IFLA_XDP_EXPECTED_FD.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/158515700967.92963.15098921624731968356.stgit@toke.dk
This commit is contained in:
Toke Høiland-Jørgensen 2020-03-25 18:23:29 +01:00 committed by Alexei Starovoitov
parent bd5ca3ef93
commit 87854a0b57
1 changed files with 62 additions and 0 deletions
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62
tools/testing/selftests/bpf/prog_tests/xdp_attach.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
#define IFINDEX_LO 1
#define XDP_FLAGS_REPLACE (1U << 4)
void test_xdp_attach(void)
{
struct bpf_object *obj1, *obj2, *obj3;
const char *file = "./test_xdp.o";
int err, fd1, fd2, fd3;
__u32 duration = 0;
DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts,
.old_fd = -1);
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj1, &fd1);
if (CHECK_FAIL(err))
return;
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj2, &fd2);
if (CHECK_FAIL(err))
goto out_1;
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj3, &fd3);
if (CHECK_FAIL(err))
goto out_2;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd1, XDP_FLAGS_REPLACE,
&opts);
if (CHECK(err, "load_ok", "initial load failed"))
goto out_close;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, XDP_FLAGS_REPLACE,
&opts);
if (CHECK(!err, "load_fail", "load with expected id didn't fail"))
goto out;
opts.old_fd = fd1;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd2, 0, &opts);
if (CHECK(err, "replace_ok", "replace valid old_fd failed"))
goto out;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, fd3, 0, &opts);
if (CHECK(!err, "replace_fail", "replace invalid old_fd didn't fail"))
goto out;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
if (CHECK(!err, "remove_fail", "remove invalid old_fd didn't fail"))
goto out;
opts.old_fd = fd2;
err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, 0, &opts);
if (CHECK(err, "remove_ok", "remove valid old_fd failed"))
goto out;
out:
bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
out_close:
bpf_object__close(obj3);
out_2:
bpf_object__close(obj2);
out_1:
bpf_object__close(obj1);
}