selftests/bpf: Update sk_storage_omem_uncharge test

Check sk_omem_alloc when the caller of bpf_local_storage_destroy()
returns. bpf_local_storage_destroy() now returns the memory to uncharge
to the caller instead of directly uncharge. Therefore, in the
sk_storage_omem_uncharge, check sk_omem_alloc when bpf_sk_storage_free()
returns instead of bpf_local_storage_destroy().

Signed-off-by: Amery Hung <[email protected]>

Author: ameryhung

tools/testing/selftests/bpf/progs/sk_storage_omem_uncharge.c

@@ -6,7 +6,6 @@
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
 
-void *local_storage_ptr = NULL;
 void *sk_ptr = NULL;
 int cookie_found = 0;
 __u64 cookie = 0;
@@ -19,21 +18,17 @@ struct {
 	__type(value, int);
 } sk_storage SEC(".maps");
 
-SEC("fexit/bpf_local_storage_destroy")
-int BPF_PROG(bpf_local_storage_destroy, struct bpf_local_storage *local_storage)
+SEC("fexit/bpf_sk_storage_free")
+int BPF_PROG(bpf_sk_storage_free, struct sock *sk)
 {
-	struct sock *sk;
-
-	if (local_storage_ptr != local_storage)
+	if (sk_ptr != sk)
 		return 0;
 
-	sk = bpf_core_cast(sk_ptr, struct sock);
 	if (sk->sk_cookie.counter != cookie)
 		return 0;
 
 	cookie_found++;
 	omem = sk->sk_omem_alloc.counter;
-	local_storage_ptr = NULL;
 
 	return 0;
 }
@@ -50,7 +45,6 @@ int BPF_PROG(inet6_sock_destruct, struct sock *sk)
 	if (value && *value == 0xdeadbeef) {
 		cookie_found++;
 		sk_ptr = sk;
-		local_storage_ptr = sk->sk_bpf_storage;
 	}
 
 	return 0;