From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
Martin KaFai Lau <kafai@fb.com>, David Miller <davem@redhat.com>,
John Fastabend <john.fastabend@gmail.com>,
Wenbo Zhang <ethercflow@gmail.com>,
KP Singh <kpsingh@chromium.org>, Andrii Nakryiko <andriin@fb.com>,
Brendan Gregg <bgregg@netflix.com>,
Florent Revest <revest@chromium.org>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: [PATCHv3 0/9] bpf: Add d_path helper
Date: Tue, 16 Jun 2020 12:05:01 +0200 [thread overview]
Message-ID: <20200616100512.2168860-1-jolsa@kernel.org> (raw)
hi,
adding d_path helper to return full path for 'path' object.
I originally added and used 'file_path' helper, which did the same,
but used 'struct file' object. Then realized that file_path is just
a wrapper for d_path, so we'd cover more calling sites if we add
d_path helper and allowed resolving BTF object within another object,
so we could call d_path also with file pointer, like:
bpf_d_path(&file->f_path, buf, size);
This feature is mainly to be able to add dpath (filepath originally)
function to bpftrace:
# bpftrace -e 'kfunc:vfs_open { printf("%s\n", dpath(args->path)); }'
v3 changes:
- changed tests to use seleton and vmlinux.h [Andrii]
- refactored to define ID lists in C object [Andrii]
- changed btf_struct_access for nested ID check,
instead of adding new function for that [Andrii]
- fail build with CONFIG_DEBUG_INFO_BTF if libelf is not detected [Andrii]
Also available at:
https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
bpf/d_path
thanks,
jirka
---
Jiri Olsa (11):
bpf: Add btfid tool to resolve BTF IDs in ELF object
bpf: Compile btfid tool at kernel compilation start
bpf: Add btf_ids object
bpf: Resolve BTF IDs in vmlinux image
bpf: Remove btf_id helpers resolving
bpf: Do not pass enum bpf_access_type to btf_struct_access
bpf: Allow nested BTF object to be refferenced by BTF object + offset
bpf: Add BTF whitelist support
bpf: Add d_path helper
selftests/bpf: Add verifier test for d_path helper
selftests/bpf: Add test for d_path helper
Makefile | 25 ++++-
include/asm-generic/vmlinux.lds.h | 4 +
include/linux/bpf.h | 16 ++-
include/uapi/linux/bpf.h | 14 ++-
kernel/bpf/Makefile | 2 +-
kernel/bpf/btf.c | 149 +++++++++++--------------
kernel/bpf/btf_ids.c | 26 +++++
kernel/bpf/btf_ids.h | 108 ++++++++++++++++++
kernel/bpf/verifier.c | 39 +++++--
kernel/trace/bpf_trace.c | 40 ++++++-
net/core/filter.c | 2 -
net/ipv4/bpf_tcp_ca.c | 2 +-
scripts/bpf_helpers_doc.py | 2 +
scripts/link-vmlinux.sh | 6 +
tools/Makefile | 3 +
tools/bpf/Makefile | 5 +-
tools/bpf/btfid/Build | 26 +++++
tools/bpf/btfid/Makefile | 71 ++++++++++++
tools/bpf/btfid/btfid.c | 627 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/include/uapi/linux/bpf.h | 14 ++-
tools/testing/selftests/bpf/prog_tests/d_path.c | 153 +++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/test_d_path.c | 55 +++++++++
tools/testing/selftests/bpf/test_verifier.c | 13 ++-
tools/testing/selftests/bpf/verifier/d_path.c | 38 +++++++
24 files changed, 1329 insertions(+), 111 deletions(-)
create mode 100644 kernel/bpf/btf_ids.c
create mode 100644 kernel/bpf/btf_ids.h
create mode 100644 tools/bpf/btfid/Build
create mode 100644 tools/bpf/btfid/Makefile
create mode 100644 tools/bpf/btfid/btfid.c
create mode 100644 tools/testing/selftests/bpf/prog_tests/d_path.c
create mode 100644 tools/testing/selftests/bpf/progs/test_d_path.c
create mode 100644 tools/testing/selftests/bpf/verifier/d_path.c
next reply other threads:[~2020-06-16 10:05 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 10:05 Jiri Olsa [this message]
2020-06-16 10:05 ` [PATCH 01/11] bpf: Add btfid tool to resolve BTF IDs in ELF object Jiri Olsa
2020-06-19 0:38 ` Andrii Nakryiko
2020-06-19 13:03 ` Jiri Olsa
2020-06-19 18:12 ` Andrii Nakryiko
2020-06-22 8:59 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 02/11] bpf: Compile btfid tool at kernel compilation start Jiri Olsa
2020-06-18 20:40 ` John Fastabend
2020-06-18 21:17 ` John Fastabend
2020-06-19 13:23 ` Jiri Olsa
2020-06-19 0:40 ` Andrii Nakryiko
2020-06-19 0:47 ` Arnaldo Carvalho de Melo
2020-06-19 2:08 ` Alexei Starovoitov
2020-06-19 3:51 ` Andrii Nakryiko
2020-06-16 10:05 ` [PATCH 03/11] bpf: Add btf_ids object Jiri Olsa
2020-06-19 0:56 ` Andrii Nakryiko
2020-06-19 1:06 ` Andrii Nakryiko
2020-06-19 13:16 ` Jiri Olsa
2020-06-19 13:13 ` Jiri Olsa
2020-06-19 18:15 ` Andrii Nakryiko
2020-06-19 1:02 ` Andrii Nakryiko
2020-06-19 13:05 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 04/11] bpf: Resolve BTF IDs in vmlinux image Jiri Olsa
2020-06-16 10:05 ` [PATCH 05/11] bpf: Remove btf_id helpers resolving Jiri Olsa
2020-06-19 1:10 ` Andrii Nakryiko
2020-06-19 13:18 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 06/11] bpf: Do not pass enum bpf_access_type to btf_struct_access Jiri Olsa
2020-06-19 3:58 ` Andrii Nakryiko
2020-06-19 13:23 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 07/11] bpf: Allow nested BTF object to be refferenced by BTF object + offset Jiri Olsa
2020-06-16 10:05 ` [PATCH 08/11] bpf: Add BTF whitelist support Jiri Olsa
2020-06-19 4:29 ` Andrii Nakryiko
2020-06-19 13:29 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 09/11] bpf: Add d_path helper Jiri Olsa
2020-06-19 4:35 ` Andrii Nakryiko
2020-06-19 13:31 ` Jiri Olsa
2020-06-19 18:25 ` Andrii Nakryiko
2020-06-22 9:02 ` Jiri Olsa
2020-06-22 19:18 ` Andrii Nakryiko
2020-06-23 10:02 ` Jiri Olsa
2020-06-23 18:58 ` Andrii Nakryiko
2020-06-23 20:14 ` Jiri Olsa
2020-06-23 20:17 ` Andrii Nakryiko
2020-06-16 10:05 ` [PATCH 10/11] selftests/bpf: Add verifier test for " Jiri Olsa
2020-06-19 4:38 ` Andrii Nakryiko
2020-06-19 13:32 ` Jiri Olsa
2020-06-16 10:05 ` [PATCH 11/11] selftests/bpf: Add " Jiri Olsa
2020-06-19 4:44 ` Andrii Nakryiko
2020-06-19 13:34 ` Jiri Olsa
2020-06-18 20:57 ` [PATCHv3 0/9] bpf: Add " John Fastabend
2020-06-19 12:35 ` Jiri Olsa
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