From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@fb.com>, bpf <bpf@vger.kernel.org>,
Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] selftests: Add test for overriding global data value before load
Date: Sat, 28 Mar 2020 13:06:18 -0700 [thread overview]
Message-ID: <CAEf4BzZPd0-unT7ChKNFCYRVU2NHfdp8kKuEFSZgaDxm9ndC8w@mail.gmail.com> (raw)
In-Reply-To: <20200328182834.196578-2-toke@redhat.com>
On Sat, Mar 28, 2020 at 11:29 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> This extends the global_data test to also exercise the new
> bpf_map__set_initial_value() function. The test simply overrides the global
> data section with all zeroes, and checks that the new value makes it into
> the kernel map on load.
>
> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
> ---
> .../selftests/bpf/prog_tests/global_data.c | 61 +++++++++++++++++++
> 1 file changed, 61 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/global_data.c b/tools/testing/selftests/bpf/prog_tests/global_data.c
> index c680926fce73..f018ce53a8d1 100644
> --- a/tools/testing/selftests/bpf/prog_tests/global_data.c
> +++ b/tools/testing/selftests/bpf/prog_tests/global_data.c
> @@ -121,6 +121,65 @@ static void test_global_data_rdonly(struct bpf_object *obj, __u32 duration)
> "err %d errno %d\n", err, errno);
> }
>
> +static void test_global_data_set_rdonly(__u32 duration)
> +{
> + const char *file = "./test_global_data.o";
> + int err = -ENOMEM, map_fd, zero = 0;
> + __u8 *buff = NULL, *newval = NULL;
> + struct bpf_program *prog;
> + struct bpf_object *obj;
> + struct bpf_map *map;
> + size_t sz;
> +
> + obj = bpf_object__open_file(file, NULL);
Try using skeleton open and load .o file, it will cut this code almost in half.
> + if (CHECK_FAIL(!obj))
> + return;
> + prog = bpf_program__next(NULL, obj);
> + if (CHECK_FAIL(!prog))
> + goto out;
> + err = bpf_program__set_sched_cls(prog);
Please fix SEC() name for that program instead of setting type explicitly.
> + if (CHECK_FAIL(err))
> + goto out;
> +
> + map = bpf_object__find_map_by_name(obj, "test_glo.rodata");
> + if (CHECK_FAIL(!map || !bpf_map__is_internal(map)))
> + goto out;
> +
> + sz = bpf_map__def(map)->value_size;
> + newval = malloc(sz);
> + if (CHECK_FAIL(!newval))
> + goto out;
> + memset(newval, 0, sz);
> +
> + /* wrong size, should fail */
> + err = bpf_map__set_initial_value(map, newval, sz - 1);
> + if (CHECK(!err, "reject set initial value wrong size", "err %d\n", err))
> + goto out;
> +
> + err = bpf_map__set_initial_value(map, newval, sz);
> + if (CHECK_FAIL(err))
> + goto out;
> +
> + err = bpf_object__load(obj);
> + if (CHECK_FAIL(err))
> + goto out;
> +
> + map_fd = bpf_map__fd(map);
> + if (CHECK_FAIL(map_fd < 0))
> + goto out;
> +
> + buff = malloc(sz);
> + if (buff)
> + err = bpf_map_lookup_elem(map_fd, &zero, buff);
> + CHECK(!buff || err || memcmp(buff, newval, sz),
> + "compare .rodata map data override",
> + "err %d errno %d\n", err, errno);
> +out:
> + free(buff);
> + free(newval);
> + bpf_object__close(obj);
> +}
> +
> void test_global_data(void)
> {
> const char *file = "./test_global_data.o";
> @@ -144,4 +203,6 @@ void test_global_data(void)
> test_global_data_rdonly(obj, duration);
>
> bpf_object__close(obj);
> +
> + test_global_data_set_rdonly(duration);
This should either be a sub-test or better yet a separate test altogether.
> }
> --
> 2.26.0
>
next prev parent reply other threads:[~2020-03-28 20:06 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 15:17 [PATCH bpf-next] libbpf: Add bpf_object__rodata getter function Toke Høiland-Jørgensen
2020-03-26 19:20 ` Andrii Nakryiko
2020-03-27 12:24 ` Toke Høiland-Jørgensen
2020-03-27 17:49 ` Andrii Nakryiko
2020-03-27 18:39 ` Toke Høiland-Jørgensen
2020-03-27 12:58 ` [PATCH bpf-next v2] libbpf: Add getter for pointer to data area for internal maps Toke Høiland-Jørgensen
2020-03-27 19:17 ` Andrii Nakryiko
2020-03-27 22:26 ` Toke Høiland-Jørgensen
2020-03-27 22:28 ` Alexei Starovoitov
2020-03-28 0:08 ` Toke Høiland-Jørgensen
2020-03-28 18:28 ` [PATCH v3 1/2] libbpf: Add setter for initial value " Toke Høiland-Jørgensen
2020-03-28 20:01 ` Andrii Nakryiko
2020-03-29 12:17 ` Toke Høiland-Jørgensen
2020-03-29 13:22 ` [PATCH v4 " Toke Høiland-Jørgensen
2020-03-29 20:06 ` Andrii Nakryiko
2020-03-29 23:46 ` Daniel Borkmann
2020-03-29 13:22 ` [PATCH v4 2/2] selftests: Add test for overriding global data value before load Toke Høiland-Jørgensen
2020-03-29 20:13 ` Andrii Nakryiko
2020-03-28 18:28 ` [PATCH v3 " Toke Høiland-Jørgensen
2020-03-28 20:06 ` Andrii Nakryiko [this message]
2020-03-29 13:10 ` Toke Høiland-Jørgensen
2020-03-29 20:08 ` Andrii Nakryiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAEf4BzZPd0-unT7ChKNFCYRVU2NHfdp8kKuEFSZgaDxm9ndC8w@mail.gmail.com \
--to=andrii.nakryiko@gmail.com \
--cc=ast@fb.com \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=netdev@vger.kernel.org \
--cc=toke@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).