BPF Archive on lore.kernel.org
 help / color / Atom feed
From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: John Fastabend <john.fastabend@gmail.com>
Cc: Yonghong Song <yhs@fb.com>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Lorenz Bauer <lmb@cloudflare.com>, bpf <bpf@vger.kernel.org>,
	Jakub Sitnicki <jakub@cloudflare.com>,
	Networking <netdev@vger.kernel.org>
Subject: Re: [bpf-next PATCH v3 4/5] bpf: selftests, add sk_msg helpers load and attach test
Date: Thu, 21 May 2020 11:51:51 -0700
Message-ID: <CAEf4BzZpZ5_Mn66h9a+VE0UtrXUcYdNe-Fj0zEvfDbhUG7Z=sw@mail.gmail.com> (raw)
In-Reply-To: <159007175735.10695.9639519610473734809.stgit@john-Precision-5820-Tower>

On Thu, May 21, 2020 at 7:36 AM John Fastabend <john.fastabend@gmail.com> wrote:
>
> The test itself is not particularly useful but it encodes a common
> pattern we have.
>
> Namely do a sk storage lookup then depending on data here decide if
> we need to do more work or alternatively allow packet to PASS. Then
> if we need to do more work consult task_struct for more information
> about the running task. Finally based on this additional information
> drop or pass the data. In this case the suspicious check is not so
> realisitic but it encodes the general pattern and uses the helpers
> so we test the workflow.
>
> This is a load test to ensure verifier correctly handles this case.
>
> Signed-off-by: John Fastabend <john.fastabend@gmail.com>
> ---
>  .../selftests/bpf/prog_tests/sockmap_basic.c       |   57 ++++++++++++++++++++
>  .../selftests/bpf/progs/test_skmsg_load_helpers.c  |   48 +++++++++++++++++
>  2 files changed, 105 insertions(+)
>  create mode 100644 tools/testing/selftests/bpf/progs/test_skmsg_load_helpers.c
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> index aa43e0b..cacb4ad 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
> @@ -1,13 +1,46 @@
>  // SPDX-License-Identifier: GPL-2.0
>  // Copyright (c) 2020 Cloudflare
> +#include <error.h>
>
>  #include "test_progs.h"
> +#include "test_skmsg_load_helpers.skel.h"
>
>  #define TCP_REPAIR             19      /* TCP sock is under repair right now */
>
>  #define TCP_REPAIR_ON          1
>  #define TCP_REPAIR_OFF_NO_WP   -1      /* Turn off without window probes */
>
> +#define _FAIL(errnum, fmt...)                                                  \
> +       ({                                                                     \
> +               error_at_line(0, (errnum), __func__, __LINE__, fmt);           \
> +               CHECK_FAIL(true);                                              \
> +       })
> +#define FAIL(fmt...) _FAIL(0, fmt)
> +#define FAIL_ERRNO(fmt...) _FAIL(errno, fmt)
> +#define FAIL_LIBBPF(err, msg)                                                  \
> +       ({                                                                     \
> +               char __buf[MAX_STRERR_LEN];                                    \
> +               libbpf_strerror((err), __buf, sizeof(__buf));                  \
> +               FAIL("%s: %s", (msg), __buf);                                  \
> +       })
> +
> +#define xbpf_prog_attach(prog, target, type, flags)                            \
> +       ({                                                                     \
> +               int __ret =                                                    \
> +                       bpf_prog_attach((prog), (target), (type), (flags));    \
> +               if (__ret == -1)                                               \
> +                       FAIL_ERRNO("prog_attach(" #type ")");                  \
> +               __ret;                                                         \
> +       })
> +
> +#define xbpf_prog_detach2(prog, target, type)                                  \
> +       ({                                                                     \
> +               int __ret = bpf_prog_detach2((prog), (target), (type));        \
> +               if (__ret == -1)                                               \
> +                       FAIL_ERRNO("prog_detach2(" #type ")");                 \
> +               __ret;                                                         \
> +       })

I'm not convinced we need these macro, can you please just use CHECKs?
I'd rather not learn each specific test's custom macros.

> +
>  static int connected_socket_v4(void)
>  {
>         struct sockaddr_in addr = {
> @@ -70,10 +103,34 @@ static void test_sockmap_create_update_free(enum bpf_map_type map_type)
>         close(s);
>  }
>
> +static void test_skmsg_helpers(enum bpf_map_type map_type)
> +{
> +       struct test_skmsg_load_helpers *skel;
> +       int err, map, verdict;
> +
> +       skel = test_skmsg_load_helpers__open_and_load();
> +       if (!skel) {
> +               FAIL("skeleton open/load failed");
> +               return;
> +       }
> +
> +       verdict = bpf_program__fd(skel->progs.prog_msg_verdict);
> +       map = bpf_map__fd(skel->maps.sock_map);
> +
> +       err = xbpf_prog_attach(verdict, map, BPF_SK_MSG_VERDICT, 0);
> +       if (err)
> +               return;
> +       xbpf_prog_detach2(verdict, map, BPF_SK_MSG_VERDICT);

no cleanup in this test, at all

> +}
> +

[...]

> +
> +int _version SEC("version") = 1;

version not needed

> +char _license[] SEC("license") = "GPL";
>

  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21 14:34 [bpf-next PATCH v3 0/5] bpf: Add sk_msg and networking helpers John Fastabend
2020-05-21 14:34 ` [bpf-next PATCH v3 1/5] bpf: sk_msg add some generic helpers that may be useful from sk_msg John Fastabend
2020-05-21 14:35 ` [bpf-next PATCH v3 2/5] bpf: extend bpf_base_func_proto helpers with probe_* and *current_task* John Fastabend
2020-05-21 14:35 ` [bpf-next PATCH v3 3/5] bpf: sk_msg add get socket storage helpers John Fastabend
2020-05-21 14:35 ` [bpf-next PATCH v3 4/5] bpf: selftests, add sk_msg helpers load and attach test John Fastabend
2020-05-21 18:23   ` Yonghong Song
2020-05-21 18:51     ` John Fastabend
2020-05-21 18:51   ` Andrii Nakryiko [this message]
2020-05-21 19:03     ` John Fastabend
2020-05-21 19:09       ` John Fastabend
2020-05-21 19:12         ` Andrii Nakryiko
2020-05-21 14:36 ` [bpf-next PATCH v3 5/5] bpf: selftests, test probe_* helpers from SCHED_CLS John Fastabend
2020-05-21 18:32   ` Yonghong Song
2020-05-21 18:47   ` Andrii Nakryiko
2020-05-21 19:11     ` John Fastabend

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='CAEf4BzZpZ5_Mn66h9a+VE0UtrXUcYdNe-Fj0zEvfDbhUG7Z=sw@mail.gmail.com' \
    --to=andrii.nakryiko@gmail.com \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=jakub@cloudflare.com \
    --cc=john.fastabend@gmail.com \
    --cc=lmb@cloudflare.com \
    --cc=netdev@vger.kernel.org \
    --cc=yhs@fb.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

BPF Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/bpf/0 bpf/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 bpf bpf/ https://lore.kernel.org/bpf \
		bpf@vger.kernel.org
	public-inbox-index bpf

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.bpf


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git