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selftests/bpf: get trusted cgrp from bpf_iter__cgroup directly

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Commit f49843afde (selftests/bpf: Add tests for css_task iter combining
with cgroup iter) added a test which demonstrates how css_task iter can be
combined with cgroup iter. That test used bpf_cgroup_from_id() to convert
bpf_iter__cgroup->cgroup to a trusted ptr which is pointless now, since
with the previous fix, we can get a trusted cgroup directly from
bpf_iter__cgroup.

Signed-off-by: Chuyi Zhou <zhouchuyi@bytedance.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20231107132204.912120-3-zhouchuyi@bytedance.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Chuyi Zhou 2023-11-07 21:22:04 +08:00 • committed by Martin KaFai Lau
parent 0de4f50de2
commit 3c5864ba9c
1 changed files with 4 additions and 12 deletions
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16
tools/testing/selftests/bpf/progs/iters_css_task.c
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@ -56,12 +56,9 @@ SEC("?iter/cgroup")
int cgroup_id_printer(struct bpf_iter__cgroup *ctx)
{
struct seq_file *seq = ctx->meta->seq;
struct cgroup *cgrp, *acquired;
struct cgroup *cgrp = ctx->cgroup;
struct cgroup_subsys_state *css;
struct task_struct *task;
u64 cgrp_id;
cgrp = ctx->cgroup;
/* epilogue */
if (cgrp == NULL) {
@ -73,20 +70,15 @@ int cgroup_id_printer(struct bpf_iter__cgroup *ctx)
if (ctx->meta->seq_num == 0)
BPF_SEQ_PRINTF(seq, "prologue\n");
cgrp_id = cgroup_id(cgrp);
BPF_SEQ_PRINTF(seq, "%8llu\n", cgroup_id(cgrp));
BPF_SEQ_PRINTF(seq, "%8llu\n", cgrp_id);
acquired = bpf_cgroup_from_id(cgrp_id);
if (!acquired)
return 0;
css = &acquired->self;
css = &cgrp->self;
css_task_cnt = 0;
bpf_for_each(css_task, task, css, CSS_TASK_ITER_PROCS) {
if (task->pid == target_pid)
css_task_cnt++;
}
bpf_cgroup_release(acquired);
return 0;
}