int stress_lru_hmap_alloc()

in bpf/map_perf_test_kern.c [163:240]

• 66 lines of code
• 19 McCabe index (conditional complexity)

int stress_lru_hmap_alloc(struct pt_regs *ctx)
{
	struct pt_regs *real_regs = (struct pt_regs *)PT_REGS_PARM1_CORE(ctx);
	char fmt[] = "Failed at stress_lru_hmap_alloc. ret:%dn";
	union {
		u16 dst6[8];
		struct {
			u16 magic0;
			u16 magic1;
			u16 tcase;
			u16 unused16;
			u32 unused32;
			u32 key;
		};
	} test_params;
	struct sockaddr_in6 *in6;
	u16 test_case;
	int addrlen, ret;
	long val = 1;
	u32 key = 0;

	in6 = (struct sockaddr_in6 *)PT_REGS_PARM2_CORE(real_regs);
	addrlen = (int)PT_REGS_PARM3_CORE(real_regs);

	if (addrlen != sizeof(*in6))
		return 0;

	ret = bpf_probe_read_user(test_params.dst6, sizeof(test_params.dst6),
				  &in6->sin6_addr);
	if (ret)
		goto done;

	if (test_params.magic0 != 0xdead ||
	    test_params.magic1 != 0xbeef)
		return 0;

	test_case = test_params.tcase;
	if (test_case != 3)
		key = bpf_get_prandom_u32();

	if (test_case == 0) {
		ret = bpf_map_update_elem(&lru_hash_map, &key, &val, BPF_ANY);
	} else if (test_case == 1) {
		ret = bpf_map_update_elem(&nocommon_lru_hash_map, &key, &val,
					  BPF_ANY);
	} else if (test_case == 2) {
		void *nolocal_lru_map;
		int cpu = bpf_get_smp_processor_id();

		nolocal_lru_map = bpf_map_lookup_elem(&array_of_lru_hashs,
						      &cpu);
		if (!nolocal_lru_map) {
			ret = -ENOENT;
			goto done;
		}

		ret = bpf_map_update_elem(nolocal_lru_map, &key, &val,
					  BPF_ANY);
	} else if (test_case == 3) {
		u32 i;

		key = test_params.key;

#pragma clang loop unroll(full)
		for (i = 0; i < 32; i++) {
			bpf_map_lookup_elem(&lru_hash_lookup_map, &key);
			key++;
		}
	} else {
		ret = -EINVAL;
	}

done:
	if (ret)
		bpf_trace_printk(fmt, sizeof(fmt), ret);

	return 0;
}