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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/arena_list.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/arena_list.c
Extension
.c
Size
2001 bytes
Lines
100
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct elem {
	struct arena_list_node node;
	__u64 value;
};

struct arena_list_head __arena *list_head;
int list_sum;
int cnt;
bool skip = false;
const volatile bool nonsleepable = false;

#ifdef __BPF_FEATURE_ADDR_SPACE_CAST
long __arena arena_sum;
int __arena test_val = 1;
struct arena_list_head __arena global_head;
#else
long arena_sum SEC(".addr_space.1");
int test_val SEC(".addr_space.1");
#endif

int zero;

void bpf_rcu_read_lock(void) __ksym;
void bpf_rcu_read_unlock(void) __ksym;

SEC("syscall")
int arena_list_add(void *ctx)
{
#ifdef __BPF_FEATURE_ADDR_SPACE_CAST
	__u64 i;

	list_head = &global_head;

	for (i = zero; i < cnt && can_loop; i++) {
		struct elem __arena *n = bpf_alloc(sizeof(*n));

		test_val++;
		n->value = i;
		arena_sum += i;
		list_add_head(&n->node, list_head);
	}
#else
	skip = true;
#endif
	return 0;
}

SEC("syscall")
int arena_list_del(void *ctx)
{
#ifdef __BPF_FEATURE_ADDR_SPACE_CAST
	struct elem __arena *n;
	int sum = 0;

	/* Take rcu_read_lock to test non-sleepable context */
	if (nonsleepable)
		bpf_rcu_read_lock();

	arena_sum = 0;
	list_for_each_entry(n, list_head, node) {
		sum += n->value;
		arena_sum += n->value;
		list_del(&n->node);
		bpf_free(n);
	}
	list_sum = sum;

	if (nonsleepable)
		bpf_rcu_read_unlock();
#else
	skip = true;
#endif
	return 0;
}

char _license[] SEC("license") = "GPL";

Annotation

Implementation Notes