From: Jiri Olsa <jolsa@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andriin@fb.com>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Alan Maguire <alan.maguire@oracle.com>
Subject: [PATCHv3 bpf-next 0/7] bpf, x86: Add bpf_get_func_ip helper
Date: Wed, 7 Jul 2021 23:47:44 +0200 [thread overview]
Message-ID: <20210707214751.159713-1-jolsa@kernel.org> (raw)
hi,
adding bpf_get_func_ip helper that returns IP address of the
caller function for trampoline and krobe programs.
There're 2 specific implementation of the bpf_get_func_ip
helper, one for trampoline progs and one for kprobe/kretprobe
progs.
The trampoline helper call is replaced/inlined by verifier
with simple move instruction. The kprobe/kretprobe is actual
helper call that returns prepared caller address.
Also available at:
https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
bpf/get_func_ip
v3 changes:
- resend with Masami in cc and v3 in each patch subject
v2 changes:
- use kprobe_running to get kprobe instead of cpu var [Masami]
- added support to add kprobe on function+offset
and test for that [Alan]
thanks,
jirka
---
Alan Maguire (1):
libbpf: allow specification of "kprobe/function+offset"
Jiri Olsa (6):
bpf, x86: Store caller's ip in trampoline stack
bpf: Enable BPF_TRAMP_F_IP_ARG for trampolines with call_get_func_ip
bpf: Add bpf_get_func_ip helper for tracing programs
bpf: Add bpf_get_func_ip helper for kprobe programs
selftests/bpf: Add test for bpf_get_func_ip helper
selftests/bpf: Add test for bpf_get_func_ip in kprobe+offset probe
arch/x86/net/bpf_jit_comp.c | 19 +++++++++++++++++++
include/linux/bpf.h | 5 +++++
include/linux/filter.h | 3 ++-
include/uapi/linux/bpf.h | 7 +++++++
kernel/bpf/trampoline.c | 12 +++++++++---
kernel/bpf/verifier.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/trace/bpf_trace.c | 32 ++++++++++++++++++++++++++++++++
tools/include/uapi/linux/bpf.h | 7 +++++++
tools/lib/bpf/libbpf.c | 20 +++++++++++++++++---
tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c | 42 ++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/get_func_ip_test.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
11 files changed, 270 insertions(+), 7 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/get_func_ip_test.c
create mode 100644 tools/testing/selftests/bpf/progs/get_func_ip_test.c
next reply other threads:[~2021-07-07 21:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 21:47 Jiri Olsa [this message]
2021-07-07 21:47 ` [PATCHv3 bpf-next 1/7] bpf, x86: Store caller's ip in trampoline stack Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 2/7] bpf: Enable BPF_TRAMP_F_IP_ARG for trampolines with call_get_func_ip Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 3/7] bpf: Add bpf_get_func_ip helper for tracing programs Jiri Olsa
2021-07-08 0:06 ` Andrii Nakryiko
2021-07-11 14:48 ` Jiri Olsa
2021-07-08 2:11 ` Alexei Starovoitov
2021-07-11 14:48 ` Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 4/7] bpf: Add bpf_get_func_ip helper for kprobe programs Jiri Olsa
2021-07-10 7:55 ` Masami Hiramatsu
2021-07-11 14:48 ` Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 5/7] selftests/bpf: Add test for bpf_get_func_ip helper Jiri Olsa
2021-07-08 0:12 ` Andrii Nakryiko
2021-07-11 14:48 ` Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 6/7] libbpf: allow specification of "kprobe/function+offset" Jiri Olsa
2021-07-08 0:14 ` Andrii Nakryiko
2021-07-11 14:48 ` Jiri Olsa
2021-07-07 21:47 ` [PATCHv3 bpf-next 7/7] selftests/bpf: Add test for bpf_get_func_ip in kprobe+offset probe Jiri Olsa
2021-07-08 0:18 ` Andrii Nakryiko
2021-07-11 14:48 ` Jiri Olsa
2021-07-12 23:32 ` Andrii Nakryiko
2021-07-13 14:15 ` Jiri Olsa
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=20210707214751.159713-1-jolsa@kernel.org \
--to=jolsa@redhat.com \
--cc=alan.maguire@oracle.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=john.fastabend@gmail.com \
--cc=kafai@fb.com \
--cc=kpsingh@chromium.org \
--cc=mhiramat@kernel.org \
--cc=netdev@vger.kernel.org \
--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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.