[RFC PATCH v4] bpftool: Add bpf_cookie to link output

[Dmitrii Dolgov <9erthalion6@gmail.com>]

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>
---
Changes in v4:
    - Fetch cookies only for bpf_perf_link
    - Signal about bpf_cookie via the flag, instead of deducing it from
      the object and link type
    - Reset pid_iter_entry to avoid invalid indirect read from stack

Changes in v3:
    - Use pid iterator to fetch bpf_cookie

Changes in v2:
    - Display bpf_cookie in bpftool link command instead perf

Previous discussion: https://lore.kernel.org/bpf/20220218075103.10002-1-9erthalion6@gmail.com/

 tools/bpf/bpftool/main.h                  |  2 ++
 tools/bpf/bpftool/pids.c                  | 10 +++++++++
 tools/bpf/bpftool/skeleton/pid_iter.bpf.c | 25 +++++++++++++++++++++++
 tools/bpf/bpftool/skeleton/pid_iter.h     |  2 ++
 4 files changed, 39 insertions(+)

diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 0c3840596b5a..1bb76aa1f3b2 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -114,6 +114,8 @@ struct obj_ref {
 struct obj_refs {
 	int ref_cnt;
 	struct obj_ref *refs;
+	bool bpf_cookie_set;
+	__u64 bpf_cookie;
 };
 
 struct btf;
diff --git a/tools/bpf/bpftool/pids.c b/tools/bpf/bpftool/pids.c
index 7c384d10e95f..152502c2d6f9 100644
--- a/tools/bpf/bpftool/pids.c
+++ b/tools/bpf/bpftool/pids.c
@@ -55,6 +55,8 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e)
 		ref->pid = e->pid;
 		memcpy(ref->comm, e->comm, sizeof(ref->comm));
 		refs->ref_cnt++;
+		refs->bpf_cookie_set = e->bpf_cookie_set;
+		refs->bpf_cookie = e->bpf_cookie;
 
 		return;
 	}
@@ -78,6 +80,8 @@ static void add_ref(struct hashmap *map, struct pid_iter_entry *e)
 	ref->pid = e->pid;
 	memcpy(ref->comm, e->comm, sizeof(ref->comm));
 	refs->ref_cnt = 1;
+	refs->bpf_cookie_set = e->bpf_cookie_set;
+	refs->bpf_cookie = e->bpf_cookie;
 
 	err = hashmap__append(map, u32_as_hash_field(e->id), refs);
 	if (err)
@@ -205,6 +209,9 @@ void emit_obj_refs_json(struct hashmap *map, __u32 id,
 		if (refs->ref_cnt == 0)
 			break;
 
+		if (refs->bpf_cookie_set)
+			jsonw_lluint_field(json_writer, "bpf_cookie", refs->bpf_cookie);
+
 		jsonw_name(json_writer, "pids");
 		jsonw_start_array(json_writer);
 		for (i = 0; i < refs->ref_cnt; i++) {
@@ -234,6 +241,9 @@ void emit_obj_refs_plain(struct hashmap *map, __u32 id, const char *prefix)
 		if (refs->ref_cnt == 0)
 			break;
 
+		if (refs->bpf_cookie_set)
+			printf("\n\tbpf_cookie %llu", refs->bpf_cookie);
+
 		printf("%s", prefix);
 		for (i = 0; i < refs->ref_cnt; i++) {
 			struct obj_ref *ref = &refs->refs[i];
diff --git a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
index f70702fcb224..91366ce33717 100644
--- a/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
+++ b/tools/bpf/bpftool/skeleton/pid_iter.bpf.c
@@ -38,6 +38,18 @@ static __always_inline __u32 get_obj_id(void *ent, enum bpf_obj_type type)
 	}
 }
 
+/* could be used only with BPF_LINK_TYPE_PERF_EVENT links */
+static __always_inline __u64 get_bpf_cookie(struct bpf_link *link)
+{
+	struct bpf_perf_link *perf_link;
+	struct perf_event *event;
+
+	perf_link = container_of(link, struct bpf_perf_link, link);
+	event = BPF_CORE_READ(perf_link, perf_file, private_data);
+	return BPF_CORE_READ(event, bpf_cookie);
+}
+
+
 SEC("iter/task_file")
 int iter(struct bpf_iter__task_file *ctx)
 {
@@ -69,8 +81,21 @@ int iter(struct bpf_iter__task_file *ctx)
 	if (file->f_op != fops)
 		return 0;
 
+	__builtin_memset(&e, 0, sizeof(e));
 	e.pid = task->tgid;
 	e.id = get_obj_id(file->private_data, obj_type);
+	e.bpf_cookie = 0;
+	e.bpf_cookie_set = false;
+
+	if (obj_type == BPF_OBJ_LINK) {
+		struct bpf_link *link = (struct bpf_link *) file->private_data;
+
+		if (BPF_CORE_READ(link, type) == BPF_LINK_TYPE_PERF_EVENT) {
+			e.bpf_cookie_set = true;
+			e.bpf_cookie = get_bpf_cookie(link);
+		}
+	}
+
 	bpf_probe_read_kernel_str(&e.comm, sizeof(e.comm),
 				  task->group_leader->comm);
 	bpf_seq_write(ctx->meta->seq, &e, sizeof(e));
diff --git a/tools/bpf/bpftool/skeleton/pid_iter.h b/tools/bpf/bpftool/skeleton/pid_iter.h
index 5692cf257adb..2676cece58d7 100644
--- a/tools/bpf/bpftool/skeleton/pid_iter.h
+++ b/tools/bpf/bpftool/skeleton/pid_iter.h
@@ -6,6 +6,8 @@
 struct pid_iter_entry {
 	__u32 id;
 	int pid;
+	__u64 bpf_cookie;
+	bool bpf_cookie_set;
 	char comm[16];
 };
 
-- 
2.32.0