* libbpf v0.2 released
@ 2020-10-28 17:47 Andrii Nakryiko
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From: Andrii Nakryiko @ 2020-10-28 17:47 UTC (permalink / raw)
To: bpf; +Cc: Andrii Nakryiko
Hi all,
I've just cut v0.2 libbpf release on Github ([0]). I figured it would
be a good refresher on what went into libbpf for this release cycle. I
apologize if I missed something important in the summary, though. And
if you see any problem with this release, please report ASAP.
## New features/APIs:
- full support for BPF-to-BPF function calls, no more need for
`__always_inline`;
- support for multiple BPF programs with the same section name;
- support for accessing in-kernel per-CPU variables;
- support for type and enum value CO-RE relocations;
- libbpf will auto-adjust CO-RE direct memory loads to adjust to
32-bit host architecture;
- BPF_PROG_BIND_MAP support, .rodata will be bound automatically if
kernel supports it;
- new APIs for programmatic generation of BTF;
- support for big-endian and little-endian endianness in BTF;
- perf buffer API additions allowing better integration with polling
libraries (`perf_buffer__buffer_cnt()`, `perf_buffer__buffer_fd()`,
`perf_buffer__consume_buffer()`);
- `bpf_prog_test_run_opts()` API;
- `bpf_program__attach_freplace()` API.
## New BPF program types supported:
- sleepable fentry/fexit/fmod_ret/lsm BPF program.
## BPF-side changes:
- libbpf will automatically fall back to `bpf_probe_read[_str]()` if
`bpf_probe_read_{kernel, user}[_str]()` are not supported on older
kernels, so it's always safe to use `bpf_probe_read_{kernel,
user}[_str]()` in your application and not worry about kernel version
compatibility;
- `bpf_d_path()` helper;
- `bpf_per_cpu_ptr()` and `bpf_this_cpu_ptr()` helpers for working
with per-CPU kernel variables;
- `bpf_copy_from_user()` helper;
- `bpf_load_hdr_opt()`, `bpf_store_hdr_opt()`,
`bpf_reserve_hdr_opt()` helpers;
- `bpf_skb_cgroup_classid()` helper;
- `bpf_redirect_neigh()` and `bpf_redirect_peer()` helpers;
- `bpf_seq_printf_btf()` and `bpf_snprintf_btf()` helpers;
- `__noinline` convenience macro;
- `bpf_tail_call_static()` wrapper.
## Deprecations:
- BPF program's "title" terminology is deprecated, please use
clearer "section_name". New API `bpf_program__section_name()` added;
- `btf_ext__reloc_line_info()` and `btf_ext__reloc_func_info()`
(used by BCC) are deprecated.
[0] https://github.com/libbpf/libbpf/releases/tag/v0.2
-- Andrii
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2020-10-28 17:47 libbpf v0.2 released Andrii Nakryiko
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