From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Alan Maguire <alan.maguire@oracle.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
Martin Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
john fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Joe Perches <joe@perches.com>, Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
andriy.shevchenko@linux.intel.com, corbet@lwn.net,
bpf <bpf@vger.kernel.org>, Networking <netdev@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
linux-doc@vger.kernel.org
Subject: Re: [PATCH v3 bpf-next 8/8] bpf/selftests: add tests for %pT format specifier
Date: Tue, 23 Jun 2020 11:16:43 -0700 [thread overview]
Message-ID: <CAEf4BzZ8cbMBVNhxXRXapyZCm_b70y-85Xb5SpB0MWBixJ9h_w@mail.gmail.com> (raw)
In-Reply-To: <1592914031-31049-9-git-send-email-alan.maguire@oracle.com>
On Tue, Jun 23, 2020 at 5:12 AM Alan Maguire <alan.maguire@oracle.com> wrote:
>
> tests verify we get 0 return value from bpf_trace_print()
> using %pT format specifier with various modifiers/pointer
> values.
>
> Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> ---
Acked-by: Andrii Nakryiko <andriin@fb.com>
> .../selftests/bpf/prog_tests/trace_printk_btf.c | 45 +++++++++++++++++++++
> .../selftests/bpf/progs/netif_receive_skb.c | 47 ++++++++++++++++++++++
> 2 files changed, 92 insertions(+)
> create mode 100644 tools/testing/selftests/bpf/prog_tests/trace_printk_btf.c
> create mode 100644 tools/testing/selftests/bpf/progs/netif_receive_skb.c
>
[...]
> diff --git a/tools/testing/selftests/bpf/progs/netif_receive_skb.c b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
> new file mode 100644
> index 0000000..03ca1d8
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/progs/netif_receive_skb.c
> @@ -0,0 +1,47 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2020, Oracle and/or its affiliates. */
> +#include "vmlinux.h"
> +#include <bpf/bpf_helpers.h>
> +#include <bpf/bpf_tracing.h>
> +
> +char _license[] SEC("license") = "GPL";
> +
> +int ret;
> +int num_subtests;
> +int ran_subtests;
oh, interesting, so Clang doesn't put these into the COM section
anymore? We used to need to explicitly zero-initialize these global
vars because of that.
> +
> +#define CHECK_PRINTK(_fmt, _p, res) \
> + do { \
> + char fmt[] = _fmt; \
pro tip: you can use `static const char fmt[] = _fmt` and it will just work.
> + ++num_subtests; \
> + if (ret >= 0) { \
> + ++ran_subtests; \
> + ret = bpf_trace_printk(fmt, sizeof(fmt), (_p)); \
> + } \
> + } while (0)
> +
> +/* TRACE_EVENT(netif_receive_skb,
> + * TP_PROTO(struct sk_buff *skb),
> + */
> +SEC("tp_btf/netif_receive_skb")
> +int BPF_PROG(trace_netif_receive_skb, struct sk_buff *skb)
> +{
> + char skb_type[] = "struct sk_buff";
same, `static const char` will generate more optimal code (good to
have good examples in selftests for people to follow). But don't
bother re-spinning just for this.
> + struct btf_ptr nullp = { .ptr = 0, .type = skb_type };
> + struct btf_ptr p = { .ptr = skb, .type = skb_type };
> +
> + CHECK_PRINTK("%pT\n", &p, &res);
> + CHECK_PRINTK("%pTc\n", &p, &res);
> + CHECK_PRINTK("%pTN\n", &p, &res);
> + CHECK_PRINTK("%pTx\n", &p, &res);
> + CHECK_PRINTK("%pT0\n", &p, &res);
> + CHECK_PRINTK("%pTcNx0\n", &p, &res);
> + CHECK_PRINTK("%pT\n", &nullp, &res);
> + CHECK_PRINTK("%pTc\n", &nullp, &res);
> + CHECK_PRINTK("%pTN\n", &nullp, &res);
> + CHECK_PRINTK("%pTx\n", &nullp, &res);
> + CHECK_PRINTK("%pT0\n", &nullp, &res);
> + CHECK_PRINTK("%pTcNx0\n", &nullp, &res);
> +
> + return 0;
> +}
> --
> 1.8.3.1
>
next prev parent reply other threads:[~2020-06-23 18:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 12:07 [PATCH v3 bpf-next 0/8] bpf, printk: add BTF-based type printing Alan Maguire
2020-06-23 12:07 ` [PATCH v3 bpf-next 1/8] bpf: provide function to get vmlinux BTF information Alan Maguire
2020-06-23 12:07 ` [PATCH v3 bpf-next 2/8] bpf: move to generic BTF show support, apply it to seq files/strings Alan Maguire
2020-06-23 12:07 ` [PATCH v3 bpf-next 3/8] checkpatch: add new BTF pointer format specifier Alan Maguire
2020-06-23 12:07 ` [PATCH v3 bpf-next 4/8] printk: add type-printing %pT format specifier which uses BTF Alan Maguire
2020-06-23 12:40 ` Andy Shevchenko
2020-06-23 13:11 ` Rasmus Villemoes
2020-06-26 10:15 ` Petr Mladek
2020-06-26 11:37 ` Alan Maguire
2020-06-29 9:43 ` Petr Mladek
2020-06-23 12:07 ` [PATCH v3 bpf-next 5/8] printk: initialize vmlinux BTF outside of printk in late_initcall() Alan Maguire
2020-06-23 12:07 ` [PATCH v3 bpf-next 6/8] printk: extend test_printf to test %pT BTF-based format specifier Alan Maguire
2020-06-23 13:02 ` Andy Shevchenko
2020-06-23 12:07 ` [PATCH v3 bpf-next 7/8] bpf: add support for %pT format specifier for bpf_trace_printk() helper Alan Maguire
2020-06-23 13:04 ` Andy Shevchenko
2020-06-23 12:07 ` [PATCH v3 bpf-next 8/8] bpf/selftests: add tests for %pT format specifier Alan Maguire
2020-06-23 18:16 ` Andrii Nakryiko [this message]
2020-06-30 11:31 ` [PATCH v3 bpf-next 0/8] bpf, printk: add BTF-based type printing Sergey Senozhatsky
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=CAEf4BzZ8cbMBVNhxXRXapyZCm_b70y-85Xb5SpB0MWBixJ9h_w@mail.gmail.com \
--to=andrii.nakryiko@gmail.com \
--cc=alan.maguire@oracle.com \
--cc=andriin@fb.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=arnaldo.melo@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=corbet@lwn.net \
--cc=daniel@iogearbox.net \
--cc=joe@perches.com \
--cc=john.fastabend@gmail.com \
--cc=kafai@fb.com \
--cc=kpsingh@chromium.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@rasmusvillemoes.dk \
--cc=netdev@vger.kernel.org \
--cc=pmladek@suse.com \
--cc=rostedt@goodmis.org \
--cc=sergey.senozhatsky@gmail.com \
--cc=songliubraving@fb.com \
--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
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).