From: Eduard Zingerman <eddyz87@gmail.com>
To: bpf@vger.kernel.org, ast@kernel.org
Cc: andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev,
kernel-team@fb.com, yonghong.song@linux.dev,
jose.marchesi@oracle.com, alan.maguire@oracle.com,
Eduard Zingerman <eddyz87@gmail.com>
Subject: [PATCH bpf-next 0/3] API to access btf_dump emit queue and print single type
Date: Thu, 16 May 2024 16:04:40 -0700 [thread overview]
Message-ID: <20240516230443.3436233-1-eddyz87@gmail.com> (raw)
This is a follow-up to the following discussion:
https://lore.kernel.org/bpf/20240503111836.25275-1-jose.marchesi@oracle.com/
As suggested by Andrii, this series adds several API functions to
allow more flexibility with btf dump:
- a function to add a type and all its dependencies to the emit queue;
- functions to provide access to the emit queue owned by btf_dump object;
- a function to print a given type (skipping any dependencies).
This should allow filtering printed types and also adding
attributes / pre-processor statements to specific types.
There are several ways to add such API:
1. The simplest in terms of code changes is to refactor
btf_dump_emit_type() to push types and forward declarations
to the emit queue, instead of printing those directly;
2. More intrusive: refactor btf_dump_emit_type() and
btf_dump_order_type() to avoid doing topological sorting twice and
put forward declarations to the emit queue at once.
This series opts for (2) as it seems to simplify library code a bit.
For the sake of discussion, source code for option (1) as available at:
https://github.com/eddyz87/bpf/tree/libbpf-sort-for-dump-api-simple
Also, this series opts for the following new API function:
int btf_dump__dump_one_type(struct btf_dump *d, __u32 id, bool fwd);
As adding _opts variant of btf_dump__dump_type seems a bit clumsy:
struct btf_dump_opts {
size_t sz;
bool fwd;
bool skip_dependencies;
bool skip_last_semi;
};
int btf_dump__dump_type_opts(struct btf_dump *d, __u32 id,
struct btf_dump_opts *opts);
but maybe community would prefer the later variant.
Eduard Zingerman (3):
libbpf: put forward declarations to btf_dump->emit_queue
libbpf: API to access btf_dump emit queue and print single type
selftests/bpf: tests for btf_dump emit queue API
tools/lib/bpf/btf.h | 33 ++
tools/lib/bpf/btf_dump.c | 363 ++++++++----------
tools/lib/bpf/libbpf.map | 4 +
.../selftests/bpf/prog_tests/btf_dump.c | 86 +++++
4 files changed, 289 insertions(+), 197 deletions(-)
--
2.34.1
next reply other threads:[~2024-05-16 23:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-16 23:04 Eduard Zingerman [this message]
2024-05-16 23:04 ` [PATCH bpf-next 1/3] libbpf: put forward declarations to btf_dump->emit_queue Eduard Zingerman
2024-05-16 23:04 ` [PATCH bpf-next 2/3] libbpf: API to access btf_dump emit queue and print single type Eduard Zingerman
2024-05-16 23:04 ` [PATCH bpf-next 3/3] selftests/bpf: tests for btf_dump emit queue API Eduard Zingerman
2024-05-17 0:02 ` [PATCH bpf-next 0/3] API to access btf_dump emit queue and print single type Eduard Zingerman
2024-05-17 2:03 ` Eduard Zingerman
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