commit | d97300d3565e99d9fea06d1875935234796f4096 | [log] [tgz] |
---|---|---|
author | Dmitrii Dolgov <9erthalion6@gmail.com> | Wed Mar 09 17:31:12 2022 +0100 |
committer | Quentin Monnet <qmonnet+github@qoba.lt> | Mon Mar 21 11:03:46 2022 +0000 |
tree | 95222949ee1005c804238c2930857dc21068e558 | |
parent | 813e72deecaaaa8a9165b8efd48ac85365e183ab [diff] |
bpftool: Add bpf_cookie to link output Commit 82e6b1eee6a8 ("bpf: Allow to specify user-provided bpf_cookie for BPF perf links") introduced the concept of user specified bpf_cookie, which could be accessed by BPF programs using bpf_get_attach_cookie(). For troubleshooting purposes it is convenient to expose bpf_cookie via bpftool as well, so there is no need to meddle with the target BPF program itself. Implemented using the pid iterator BPF program to actually fetch bpf_cookies, which allows constraining code changes only to bpftool. $ bpftool link 1: type 7 prog 5 bpf_cookie 123 pids bootstrap(81) Signed-off-by: Dmitrii Dolgov <9erthalion6@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Quentin Monnet <quentin@isovalent.com> Link: https://lore.kernel.org/bpf/20220309163112.24141-1-9erthalion6@gmail.com
This is a mirror of bpf-next Linux source tree's tools/bpf/bpftool
directory, plus its few dependencies from under kernel/bpf/
, and its supporting header files.
All the gory details of syncing can be found in scripts/sync-kernel.sh
script.
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 successful.
Please check out the manual pages for documentation about bpftool. A number of example invocations are also displayed in this blog post.
All general BPF questions, including kernel functionality, bpftool features and usage, should be sent to bpf@vger.kernel.org mailing list. You can subscribe to it here and search its archive here. 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 bpftool mirror repo is set up and organized.
Required:
Optional:
This repository uses libbpf as a submodule. You can initialize it when cloning bpftool:
$ git clone --recurse-submodules https://github.com/libbpf/bpftool.git
Alternatively, if you have already cloned the repository, you can initialize the submodule by running the following command from within the repository:
$ git submodule update --init
To build bpftool:
$ cd src
$ make
To build and install bpftool on the system:
$ cd src # make install
Building bpftool in a separate directory is supported via the OUTPUT
variable:
$ mkdir /tmp/bpftool $ cd src $ OUTPUT=/tmp/bpftool make
Most of the output is suppressed by default, but detailed building logs can be displayed by passing V=1
:
$ cd src $ make V=1
Additional CFLAGS
can be passed to the command line if required. For example, we can create a static build with the following commands (but note that this does not work out-of-the-box when linking with libbfd):
$ cd src $ CFLAGS=--static make
The man pages for bpftool can be built with:
$ cd docs
$ make
They can be installed on the system with:
$ cd docs # make install
This work is dual-licensed under the GNU GPL v2.0 (only) license and the BSD 2-clause license. You can choose between one of them if you use this work.
SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)