diff mbox series

[v1,bpf-next,4/4] selftests/bpf: Test bpf_kptr_xchg stashing into local kptr

Message ID 20240728030115.3970543-5-amery.hung@bytedance.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Support bpf_kptr_xchg into local kptr | expand

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netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 7 this patch: 7
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netdev/cc_maintainers warning 12 maintainers not CCed: kpsingh@kernel.org shuah@kernel.org haoluo@google.com john.fastabend@gmail.com jolsa@kernel.org yonghong.song@linux.dev martin.lau@linux.dev mykolal@fb.com song@kernel.org linux-kselftest@vger.kernel.org eddyz87@gmail.com sdf@fomichev.me
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
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netdev/checkpatch warning CHECK: spaces preferred around that '*' (ctx:WxV)
netdev/build_clang_rust success No Rust files in patch. Skipping build
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Commit Message

Amery Hung July 28, 2024, 3:01 a.m. UTC 
From: Dave Marchevsky <davemarchevsky@fb.com>

Test stashing a referenced kptr in to a local kptr.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Amery Hung <amery.hung@bytedance.com>
---
 .../selftests/bpf/progs/local_kptr_stash.c    | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/local_kptr_stash.c b/tools/testing/selftests/bpf/progs/local_kptr_stash.c
index 75043ffc5dad..a0d784e8a05b 100644
--- a/tools/testing/selftests/bpf/progs/local_kptr_stash.c
+++ b/tools/testing/selftests/bpf/progs/local_kptr_stash.c
@@ -11,6 +11,7 @@ 
 struct node_data {
 	long key;
 	long data;
+	struct prog_test_ref_kfunc __kptr *stashed_in_node;
 	struct bpf_rb_node node;
 };
 
@@ -85,18 +86,35 @@  static bool less(struct bpf_rb_node *a, const struct bpf_rb_node *b)
 
 static int create_and_stash(int idx, int val)
 {
+	struct prog_test_ref_kfunc *inner;
 	struct map_value *mapval;
 	struct node_data *res;
+	unsigned long dummy;
 
 	mapval = bpf_map_lookup_elem(&some_nodes, &idx);
 	if (!mapval)
 		return 1;
 
+	dummy = 0;
+	inner = bpf_kfunc_call_test_acquire(&dummy);
+	if (!inner)
+		return 2;
+
 	res = bpf_obj_new(typeof(*res));
-	if (!res)
-		return 1;
+	if (!res) {
+		bpf_kfunc_call_test_release(inner);
+		return 3;
+	}
 	res->key = val;
 
+	inner = bpf_kptr_xchg(&res->stashed_in_node, inner);
+	if (inner) {
+		/* Should never happen, we just obj_new'd res */
+		bpf_kfunc_call_test_release(inner);
+		bpf_obj_drop(res);
+		return 4;
+	}
+
 	res = bpf_kptr_xchg(&mapval->node, res);
 	if (res)
 		bpf_obj_drop(res);