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README: info on routing general BPF/libbpf quesions

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We keep getting more and more questions about BPF/libbpf usage.
This repo is not the right place to ask them, as not that many people
monitor it. Re-route folks to bpf@vger.kernel.org

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
This commit is contained in:
Andrii Nakryiko
2020-06-22 20:48:02 -07:00
committed by Andrii Nakryiko
parent ac74ee188d
commit 143213eb82
1 changed files with 35 additions and 23 deletions
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58
README.md
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@@ -1,20 +1,29 @@
This is a mirror of [bpf-next Linux source
This is a mirror of [bpf-next linux tree](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)'s tree](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)'s
`tools/lib/bpf` directory plus its supporting header files. `tools/lib/bpf` directory plus its supporting header files.
The following files will by sync'ed with bpf-next repo: All the gory details of syncing can be found in `scripts/sync-kernel.sh`
- `src/` <-> `bpf-next/tools/lib/bpf/` script.
- `include/uapi/linux/bpf_common.h` <-> `bpf-next/tools/include/uapi/linux/bpf_common.h`
- `include/uapi/linux/bpf.h` <-> `bpf-next/tools/include/uapi/linux/bpf.h`
- `include/uapi/linux/btf.h` <-> `bpf-next/tools/include/uapi/linux/btf.h`
- `include/uapi/linux/if_link.h` <-> `bpf-next/tools/include/uapi/linux/if_link.h`
- `include/uapi/linux/if_xdp.h` <-> `bpf-next/tools/include/uapi/linux/if_xdp.h`
- `include/uapi/linux/netlink.h` <-> `bpf-next/tools/include/uapi/linux/netlink.h`
- `include/tools/libc_compat.h` <-> `bpf-next/tools/include/tools/libc_compat.h`
Other header files at this repo (`include/linux/*.h`) are reduced versions of Some header files in this repo (`include/linux/*.h`) are reduced versions of
their counterpart files at bpf-next's `tools/include/linux/*.h` to make compilation their counterpart files at
successful. [bpf-next](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/)'s
`tools/include/linux/*.h` to make compilation successful.
BPF questions
=============
All general BPF questions, including kernel functionality, libbpf APIs and
their application, should be sent to bpf@vger.kernel.org mailing list. You can
subscribe to it [here](http://vger.kernel.org/vger-lists.html#bpf) and search
its archive [here](https://lore.kernel.org/bpf/). Please search the archive
before asking new questions. It very well might be that this was already
addressed or answered before.
bpf@vger.kernel.org is monitored by many more people and they will happily try
to help you with whatever issue you have. This repository's PRs and issues
should be opened only for dealing with issues pertaining to specific way this
libbpf mirror repo is set up and organized.
Build Build
[![Build Status](https://travis-ci.org/libbpf/libbpf.svg?branch=master)](https://travis-ci.org/libbpf/libbpf) [![Build Status](https://travis-ci.org/libbpf/libbpf.svg?branch=master)](https://travis-ci.org/libbpf/libbpf)
@@ -25,8 +34,9 @@ libelf is an internal dependency of libbpf and thus it is required to link
against and must be installed on the system for applications to work. against and must be installed on the system for applications to work.
pkg-config is used by default to find libelf, and the program called can be pkg-config is used by default to find libelf, and the program called can be
overridden with `PKG_CONFIG`. overridden with `PKG_CONFIG`.
If using `pkg-config` at build time is not desired, it can be disabled by setting
`NO_PKG_CONFIG=1` when calling make. If using `pkg-config` at build time is not desired, it can be disabled by
setting `NO_PKG_CONFIG=1` when calling make.
To build both static libbpf.a and shared libbpf.so: To build both static libbpf.a and shared libbpf.so:
```bash ```bash
@@ -62,13 +72,15 @@ Distributions packaging libbpf from this mirror:
Benefits of packaging from the mirror over packaging from kernel sources: Benefits of packaging from the mirror over packaging from kernel sources:
- Consistent versioning across distributions. - Consistent versioning across distributions.
- No ties to any specific kernel, transparent handling of older kernels. - No ties to any specific kernel, transparent handling of older kernels.
Libbpf is designed to be kernel-agnostic and work across multitude of kernel Libbpf is designed to be kernel-agnostic and work across multitude of
versions. It has built-in mechanisms to gracefully handle older kernels, kernel versions. It has built-in mechanisms to gracefully handle older
that are missing some of the features, by working around or gracefully kernels, that are missing some of the features, by working around or
degrading functionality. Thus libbpf is not tied to a specific kernel gracefully degrading functionality. Thus libbpf is not tied to a specific
version and can/should be packaged and versioned independently. kernel version and can/should be packaged and versioned independently.
- Continuous integration testing via [TravisCI](https://travis-ci.org/libbpf/libbpf). - Continuous integration testing via
- Static code analysis via [LGTM](https://lgtm.com/projects/g/libbpf/libbpf) and [Coverity](https://scan.coverity.com/projects/libbpf). [TravisCI](https://travis-ci.org/libbpf/libbpf).
- Static code analysis via [LGTM](https://lgtm.com/projects/g/libbpf/libbpf)
and [Coverity](https://scan.coverity.com/projects/libbpf).
Package dependencies of libbpf, package names may vary across distros: Package dependencies of libbpf, package names may vary across distros:
- zlib - zlib