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Date: Wed, 19 Aug 2020 13:45:31 -0700
From: Yonghong Song <yhs@...com>
To: Lorenz Bauer <lmb@...udflare.com>, <jakub@...udflare.com>,
<john.fastabend@...il.com>, Shuah Khan <shuah@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>
CC: <kernel-team@...udflare.com>, <linux-kernel@...r.kernel.org>,
<linux-kselftest@...r.kernel.org>, <netdev@...r.kernel.org>,
<bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next 6/6] selftests: bpf: test sockmap update from BPF
On 8/19/20 2:24 AM, Lorenz Bauer wrote:
> Add a test which copies a socket from a sockmap into another sockmap
> or sockhash. This excercises bpf_map_update_elem support from BPF
> context. Compare the socket cookies from source and destination to
> ensure that the copy succeeded.
>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---
> .../selftests/bpf/prog_tests/sockmap_basic.c | 76 +++++++++++++++++++
> .../selftests/bpf/progs/test_sockmap_copy.c | 48 ++++++++++++
> 2 files changed, 124 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_copy.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> index 96e7b7f84c65..d30cabc00e9e 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> @@ -4,6 +4,7 @@
>
> #include "test_progs.h"
> #include "test_skmsg_load_helpers.skel.h"
> +#include "test_sockmap_copy.skel.h"
>
> #define TCP_REPAIR 19 /* TCP sock is under repair right now */
>
> @@ -101,6 +102,77 @@ static void test_skmsg_helpers(enum bpf_map_type map_type)
> test_skmsg_load_helpers__destroy(skel);
> }
>
> +static void test_sockmap_copy(enum bpf_map_type map_type)
> +{
> + struct bpf_prog_test_run_attr attr;
> + struct test_sockmap_copy *skel;
> + __u64 src_cookie, dst_cookie;
> + int err, prog, s, src, dst;
> + const __u32 zero = 0;
> + char dummy[14] = {0};
> +
> + s = connected_socket_v4();
Maybe change variable name to "sk" for better clarity?
> + if (CHECK_FAIL(s == -1))
> + return;
> +
> + skel = test_sockmap_copy__open_and_load();
> + if (CHECK_FAIL(!skel)) {
> + close(s);
> + perror("test_sockmap_copy__open_and_load");
> + return;
> + }
Could you use CHECK instead of CHECK_FAIL?
With CHECK, you can print additional information without perror.
> +
> + prog = bpf_program__fd(skel->progs.copy_sock_map);
> + src = bpf_map__fd(skel->maps.src);
> + if (map_type == BPF_MAP_TYPE_SOCKMAP)
> + dst = bpf_map__fd(skel->maps.dst_sock_map);
> + else
> + dst = bpf_map__fd(skel->maps.dst_sock_hash);
> +
> + err = bpf_map_update_elem(src, &zero, &s, BPF_NOEXIST);
The map defined in bpf program is __u64 and here "s" is int.
Any potential issues?
> + if (CHECK_FAIL(err)) {
> + perror("bpf_map_update");
> + goto out;
> + }
> +
> + err = bpf_map_lookup_elem(src, &zero, &src_cookie);
> + if (CHECK_FAIL(err)) {
> + perror("bpf_map_lookup_elem(src)");
> + goto out;
> + }
> +
> + attr = (struct bpf_prog_test_run_attr){
> + .prog_fd = prog,
> + .repeat = 1,
> + .data_in = dummy,
> + .data_size_in = sizeof(dummy),
> + };
> +
> + err = bpf_prog_test_run_xattr(&attr);
> + if (err) {
You can use CHECK macro here.
> + test__fail();
> + perror("bpf_prog_test_run");
> + goto out;
> + } else if (!attr.retval) {
> + PRINT_FAIL("bpf_prog_test_run: program returned %u\n",
> + attr.retval);
> + goto out;
> + }
> +
> + err = bpf_map_lookup_elem(dst, &zero, &dst_cookie);
> + if (CHECK_FAIL(err)) {
> + perror("bpf_map_lookup_elem(dst)");
> + goto out;
> + }
> +
> + if (dst_cookie != src_cookie)
> + PRINT_FAIL("cookie %llu != %llu\n", dst_cookie, src_cookie);
Just replace the whole if statement with a CHECK macro.
> +
> +out:
> + close(s);
> + test_sockmap_copy__destroy(skel);
> +}
> +
> void test_sockmap_basic(void)
> {
> if (test__start_subtest("sockmap create_update_free"))
> @@ -111,4 +183,8 @@ void test_sockmap_basic(void)
> test_skmsg_helpers(BPF_MAP_TYPE_SOCKMAP);
> if (test__start_subtest("sockhash sk_msg load helpers"))
> test_skmsg_helpers(BPF_MAP_TYPE_SOCKHASH);
> + if (test__start_subtest("sockmap copy"))
> + test_sockmap_copy(BPF_MAP_TYPE_SOCKMAP);
> + if (test__start_subtest("sockhash copy"))
> + test_sockmap_copy(BPF_MAP_TYPE_SOCKHASH);
> }
> diff --git a/tools/testing/selftests/bpf/progs/test_sockmap_copy.c b/tools/testing/selftests/bpf/progs/test_sockmap_copy.c
> new file mode 100644
> index 000000000000..9d0c9f28cab2
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/test_sockmap_copy.c
> @@ -0,0 +1,48 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2020 Cloudflare
> +#include "vmlinux.h"
> +#include <bpf/bpf_helpers.h>
> +
> +struct {
> + __uint(type, BPF_MAP_TYPE_SOCKMAP);
> + __uint(max_entries, 1);
> + __type(key, __u32);
> + __type(value, __u64);
> +} src SEC(".maps");
> +
> +struct {
> + __uint(type, BPF_MAP_TYPE_SOCKMAP);
> + __uint(max_entries, 1);
> + __type(key, __u32);
> + __type(value, __u64);
> +} dst_sock_map SEC(".maps");
> +
> +struct {
> + __uint(type, BPF_MAP_TYPE_SOCKHASH);
> + __uint(max_entries, 1);
> + __type(key, __u32);
> + __type(value, __u64);
> +} dst_sock_hash SEC(".maps");
> +
> +SEC("classifier/copy_sock_map")
> +int copy_sock_map(void *ctx)
> +{
> + struct bpf_sock *sk;
> + bool failed = false;
> + __u32 key = 0;
> +
> + sk = bpf_map_lookup_elem(&src, &key);
> + if (!sk)
> + return SK_DROP;
> +
> + if (bpf_map_update_elem(&dst_sock_map, &key, sk, 0))
> + failed = true;
> +
> + if (bpf_map_update_elem(&dst_sock_hash, &key, sk, 0))
> + failed = true;
> +
> + bpf_sk_release(sk);
> + return failed ? SK_DROP : SK_PASS;
> +}
> +
> +char _license[] SEC("license") = "GPL";
>
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