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| author | Chuyi Zhou <zhouchuyi@bytedance.com> | 2023-10-18 14:17:42 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-10-19 17:02:46 -0700 |
| commit | 7251d0905e7518bcb990c8e9a3615b1bb23c78f2 (patch) | |
| tree | 28cbfe76ea2eff8d6ae5cd09f32c732a1cdd6e80 /tools | |
| parent | c68a78ffe2cb4207f64fd0f4262818c728c67be0 (diff) | |
| download | lwn-7251d0905e7518bcb990c8e9a3615b1bb23c78f2.tar.gz lwn-7251d0905e7518bcb990c8e9a3615b1bb23c78f2.zip | |
bpf: Introduce css open-coded iterator kfuncs
This Patch adds kfuncs bpf_iter_css_{new,next,destroy} which allow
creation and manipulation of struct bpf_iter_css in open-coded iterator
style. These kfuncs actually wrapps css_next_descendant_{pre, post}.
css_iter can be used to:
1) iterating a sepcific cgroup tree with pre/post/up order
2) iterating cgroup_subsystem in BPF Prog, like
for_each_mem_cgroup_tree/cpuset_for_each_descendant_pre in kernel.
The API design is consistent with cgroup_iter. bpf_iter_css_new accepts
parameters defining iteration order and starting css. Here we also reuse
BPF_CGROUP_ITER_DESCENDANTS_PRE, BPF_CGROUP_ITER_DESCENDANTS_POST,
BPF_CGROUP_ITER_ANCESTORS_UP enums.
Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20231018061746.111364-5-zhouchuyi@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_experimental.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h index 2f6c747aa874..1386baf9ae4a 100644 --- a/tools/testing/selftests/bpf/bpf_experimental.h +++ b/tools/testing/selftests/bpf/bpf_experimental.h @@ -471,4 +471,10 @@ extern int bpf_iter_task_new(struct bpf_iter_task *it, extern struct task_struct *bpf_iter_task_next(struct bpf_iter_task *it) __weak __ksym; extern void bpf_iter_task_destroy(struct bpf_iter_task *it) __weak __ksym; +struct bpf_iter_css; +extern int bpf_iter_css_new(struct bpf_iter_css *it, + struct cgroup_subsys_state *start, unsigned int flags) __weak __ksym; +extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __weak __ksym; +extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym; + #endif |