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bpf: Add CGROUP prefix to cgroup_iter_order 

bpf_cgroup_iter_order is globally visible but the entries do not have
CGROUP prefix. As requested by Andrii, put a CGROUP in the names
in bpf_cgroup_iter_order.

This patch fixes two previous commits: one introduced the API and
the other uses the API in bpf selftest (that is, the selftest
cgroup_hierarchical_stats).

I tested this patch via the following command:

  test_progs -t cgroup,iter,btf_dump

Fixes: d4ccaf58a8 ("bpf: Introduce cgroup iter")
Fixes: 88886309d2 ("selftests/bpf: add a selftest for cgroup hierarchical stats collection")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220825223936.1865810-1-haoluo@google.com
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
This commit is contained in:
Hao Luo 2022-08-25 15:39:36 -07:00 committed by Martin KaFai Lau
parent 0a0d55ef3e
commit d4ffb6f39f
6 changed files with 33 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/uapi/linux/bpf.h
View File

@ -88,11 +88,11 @@ struct bpf_cgroup_storage_key {
};
enum bpf_cgroup_iter_order {
BPF_ITER_ORDER_UNSPEC = 0,
BPF_ITER_SELF_ONLY, /* process only a single object. */
BPF_ITER_DESCENDANTS_PRE, /* walk descendants in pre-order. */
BPF_ITER_DESCENDANTS_POST, /* walk descendants in post-order. */
BPF_ITER_ANCESTORS_UP, /* walk ancestors upward. */
BPF_CGROUP_ITER_ORDER_UNSPEC = 0,
BPF_CGROUP_ITER_SELF_ONLY, /* process only a single object. */
BPF_CGROUP_ITER_DESCENDANTS_PRE, /* walk descendants in pre-order. */
BPF_CGROUP_ITER_DESCENDANTS_POST, /* walk descendants in post-order. */
BPF_CGROUP_ITER_ANCESTORS_UP, /* walk ancestors upward. */
};
union bpf_iter_link_info {

32
kernel/bpf/cgroup_iter.c
View File

@ -74,13 +74,13 @@ static void *cgroup_iter_seq_start(struct seq_file *seq, loff_t *pos)
++*pos;
p->terminate = false;
p->visited_all = false;
if (p->order == BPF_ITER_DESCENDANTS_PRE)
if (p->order == BPF_CGROUP_ITER_DESCENDANTS_PRE)
return css_next_descendant_pre(NULL, p->start_css);
else if (p->order == BPF_ITER_DESCENDANTS_POST)
else if (p->order == BPF_CGROUP_ITER_DESCENDANTS_POST)
return css_next_descendant_post(NULL, p->start_css);
else if (p->order == BPF_ITER_ANCESTORS_UP)
else if (p->order == BPF_CGROUP_ITER_ANCESTORS_UP)
return p->start_css;
else /* BPF_ITER_SELF_ONLY */
else /* BPF_CGROUP_ITER_SELF_ONLY */
return p->start_css;
}
@ -109,13 +109,13 @@ static void *cgroup_iter_seq_next(struct seq_file *seq, void *v, loff_t *pos)
if (p->terminate)
return NULL;
if (p->order == BPF_ITER_DESCENDANTS_PRE)
if (p->order == BPF_CGROUP_ITER_DESCENDANTS_PRE)
return css_next_descendant_pre(curr, p->start_css);
else if (p->order == BPF_ITER_DESCENDANTS_POST)
else if (p->order == BPF_CGROUP_ITER_DESCENDANTS_POST)
return css_next_descendant_post(curr, p->start_css);
else if (p->order == BPF_ITER_ANCESTORS_UP)
else if (p->order == BPF_CGROUP_ITER_ANCESTORS_UP)
return curr->parent;
else /* BPF_ITER_SELF_ONLY */
else /* BPF_CGROUP_ITER_SELF_ONLY */
return NULL;
}
@ -188,10 +188,10 @@ static int bpf_iter_attach_cgroup(struct bpf_prog *prog,
int order = linfo->cgroup.order;
struct cgroup *cgrp;
if (order != BPF_ITER_DESCENDANTS_PRE &&
order != BPF_ITER_DESCENDANTS_POST &&
order != BPF_ITER_ANCESTORS_UP &&
order != BPF_ITER_SELF_ONLY)
if (order != BPF_CGROUP_ITER_DESCENDANTS_PRE &&
order != BPF_CGROUP_ITER_DESCENDANTS_POST &&
order != BPF_CGROUP_ITER_ANCESTORS_UP &&
order != BPF_CGROUP_ITER_SELF_ONLY)
return -EINVAL;
if (fd && id)
@ -239,13 +239,13 @@ static void bpf_iter_cgroup_show_fdinfo(const struct bpf_iter_aux_info *aux,
kfree(buf);
show_order:
if (aux->cgroup.order == BPF_ITER_DESCENDANTS_PRE)
if (aux->cgroup.order == BPF_CGROUP_ITER_DESCENDANTS_PRE)
seq_puts(seq, "order: descendants_pre\n");
else if (aux->cgroup.order == BPF_ITER_DESCENDANTS_POST)
else if (aux->cgroup.order == BPF_CGROUP_ITER_DESCENDANTS_POST)
seq_puts(seq, "order: descendants_post\n");
else if (aux->cgroup.order == BPF_ITER_ANCESTORS_UP)
else if (aux->cgroup.order == BPF_CGROUP_ITER_ANCESTORS_UP)
seq_puts(seq, "order: ancestors_up\n");
else /* BPF_ITER_SELF_ONLY */
else /* BPF_CGROUP_ITER_SELF_ONLY */
seq_puts(seq, "order: self_only\n");
}

10
tools/include/uapi/linux/bpf.h
View File

@ -88,11 +88,11 @@ struct bpf_cgroup_storage_key {
};
enum bpf_cgroup_iter_order {
BPF_ITER_ORDER_UNSPEC = 0,
BPF_ITER_SELF_ONLY, /* process only a single object. */
BPF_ITER_DESCENDANTS_PRE, /* walk descendants in pre-order. */
BPF_ITER_DESCENDANTS_POST, /* walk descendants in post-order. */
BPF_ITER_ANCESTORS_UP, /* walk ancestors upward. */
BPF_CGROUP_ITER_ORDER_UNSPEC = 0,
BPF_CGROUP_ITER_SELF_ONLY, /* process only a single object. */
BPF_CGROUP_ITER_DESCENDANTS_PRE, /* walk descendants in pre-order. */
BPF_CGROUP_ITER_DESCENDANTS_POST, /* walk descendants in post-order. */
BPF_CGROUP_ITER_ANCESTORS_UP, /* walk ancestors upward. */
};
union bpf_iter_link_info {

2
tools/testing/selftests/bpf/prog_tests/btf_dump.c
View File

@ -764,7 +764,7 @@ static void test_btf_dump_struct_data(struct btf *btf, struct btf_dump *d,
/* union with nested struct */
TEST_BTF_DUMP_DATA(btf, d, "union", str, union bpf_iter_link_info, BTF_F_COMPACT,
"(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},.cgroup = (struct){.order = (enum bpf_cgroup_iter_order)BPF_ITER_SELF_ONLY,.cgroup_fd = (__u32)1,},}",
"(union bpf_iter_link_info){.map = (struct){.map_fd = (__u32)1,},.cgroup = (struct){.order = (enum bpf_cgroup_iter_order)BPF_CGROUP_ITER_SELF_ONLY,.cgroup_fd = (__u32)1,},}",
{ .cgroup = { .order = 1, .cgroup_fd = 1, }});
/* struct skb with nested structs/unions; because type output is so

2
tools/testing/selftests/bpf/prog_tests/cgroup_hierarchical_stats.c
View File

@ -275,7 +275,7 @@ static int setup_cgroup_iter(struct cgroup_hierarchical_stats *obj,
* traverse one cgroup, so set the traversal order to "self".
*/
linfo.cgroup.cgroup_fd = cgroup_fd;
linfo.cgroup.order = BPF_ITER_SELF_ONLY;
linfo.cgroup.order = BPF_CGROUP_ITER_SELF_ONLY;
opts.link_info = &linfo;
opts.link_info_len = sizeof(linfo);
link = bpf_program__attach_iter(obj->progs.dump_vmscan, &opts);

10
tools/testing/selftests/bpf/prog_tests/cgroup_iter.c
View File

@ -134,7 +134,7 @@ static void test_walk_preorder(struct cgroup_iter *skel)
cg_id[PARENT], cg_id[CHILD1], cg_id[CHILD2]);
read_from_cgroup_iter(skel->progs.cgroup_id_printer, cg_fd[PARENT],
BPF_ITER_DESCENDANTS_PRE, "preorder");
BPF_CGROUP_ITER_DESCENDANTS_PRE, "preorder");
}
/* Postorder walk prints child and parent in order. */
@ -145,7 +145,7 @@ static void test_walk_postorder(struct cgroup_iter *skel)
cg_id[CHILD1], cg_id[CHILD2], cg_id[PARENT]);
read_from_cgroup_iter(skel->progs.cgroup_id_printer, cg_fd[PARENT],
BPF_ITER_DESCENDANTS_POST, "postorder");
BPF_CGROUP_ITER_DESCENDANTS_POST, "postorder");
}
/* Walking parents prints parent and then root. */
@ -159,7 +159,7 @@ static void test_walk_ancestors_up(struct cgroup_iter *skel)
cg_id[PARENT], cg_id[ROOT]);
read_from_cgroup_iter(skel->progs.cgroup_id_printer, cg_fd[PARENT],
BPF_ITER_ANCESTORS_UP, "ancestors_up");
BPF_CGROUP_ITER_ANCESTORS_UP, "ancestors_up");
skel->bss->terminal_cgroup = 0;
}
@ -174,7 +174,7 @@ static void test_early_termination(struct cgroup_iter *skel)
PROLOGUE "%8llu\n" EPILOGUE, cg_id[PARENT]);
read_from_cgroup_iter(skel->progs.cgroup_id_printer, cg_fd[PARENT],
BPF_ITER_DESCENDANTS_PRE, "early_termination");
BPF_CGROUP_ITER_DESCENDANTS_PRE, "early_termination");
skel->bss->terminate_early = 0;
}
@ -186,7 +186,7 @@ static void test_walk_self_only(struct cgroup_iter *skel)
PROLOGUE "%8llu\n" EPILOGUE, cg_id[PARENT]);
read_from_cgroup_iter(skel->progs.cgroup_id_printer, cg_fd[PARENT],
BPF_ITER_SELF_ONLY, "self_only");
BPF_CGROUP_ITER_SELF_ONLY, "self_only");
}
void test_cgroup_iter(void)