1bd4aed0eSJiong Wang // SPDX-License-Identifier: GPL-2.0 2bd4aed0eSJiong Wang // Copyright (c) 2019 Facebook 3bd4aed0eSJiong Wang #include <linux/bpf.h> 4bd4aed0eSJiong Wang #include <linux/version.h> 5bd4aed0eSJiong Wang #include "bpf_helpers.h" 6bd4aed0eSJiong Wang 7bd4aed0eSJiong Wang #define VAR_NUM 16 8bd4aed0eSJiong Wang 9bd4aed0eSJiong Wang struct hmap_elem { 10bd4aed0eSJiong Wang struct bpf_spin_lock lock; 11bd4aed0eSJiong Wang int var[VAR_NUM]; 12bd4aed0eSJiong Wang }; 13bd4aed0eSJiong Wang 14f6544074SAndrii Nakryiko struct { 15f6544074SAndrii Nakryiko __u32 type; 16f6544074SAndrii Nakryiko __u32 max_entries; 17f6544074SAndrii Nakryiko __u32 *key; 18f6544074SAndrii Nakryiko struct hmap_elem *value; 19f6544074SAndrii Nakryiko } hash_map SEC(".maps") = { 20bd4aed0eSJiong Wang .type = BPF_MAP_TYPE_HASH, 21bd4aed0eSJiong Wang .max_entries = 1, 22bd4aed0eSJiong Wang }; 23bd4aed0eSJiong Wang 24bd4aed0eSJiong Wang struct array_elem { 25bd4aed0eSJiong Wang struct bpf_spin_lock lock; 26bd4aed0eSJiong Wang int var[VAR_NUM]; 27bd4aed0eSJiong Wang }; 28bd4aed0eSJiong Wang 29f6544074SAndrii Nakryiko struct { 30f6544074SAndrii Nakryiko __u32 type; 31f6544074SAndrii Nakryiko __u32 max_entries; 32f6544074SAndrii Nakryiko int *key; 33f6544074SAndrii Nakryiko struct array_elem *value; 34f6544074SAndrii Nakryiko } array_map SEC(".maps") = { 35bd4aed0eSJiong Wang .type = BPF_MAP_TYPE_ARRAY, 36bd4aed0eSJiong Wang .max_entries = 1, 37bd4aed0eSJiong Wang }; 38bd4aed0eSJiong Wang 39bd4aed0eSJiong Wang SEC("map_lock_demo") 40bd4aed0eSJiong Wang int bpf_map_lock_test(struct __sk_buff *skb) 41bd4aed0eSJiong Wang { 42bd4aed0eSJiong Wang struct hmap_elem zero = {}, *val; 43bd4aed0eSJiong Wang int rnd = bpf_get_prandom_u32(); 44bd4aed0eSJiong Wang int key = 0, err = 1, i; 45bd4aed0eSJiong Wang struct array_elem *q; 46bd4aed0eSJiong Wang 47bd4aed0eSJiong Wang val = bpf_map_lookup_elem(&hash_map, &key); 48bd4aed0eSJiong Wang if (!val) 49bd4aed0eSJiong Wang goto err; 50bd4aed0eSJiong Wang /* spin_lock in hash map */ 51bd4aed0eSJiong Wang bpf_spin_lock(&val->lock); 52bd4aed0eSJiong Wang for (i = 0; i < VAR_NUM; i++) 53bd4aed0eSJiong Wang val->var[i] = rnd; 54bd4aed0eSJiong Wang bpf_spin_unlock(&val->lock); 55bd4aed0eSJiong Wang 56bd4aed0eSJiong Wang /* spin_lock in array */ 57bd4aed0eSJiong Wang q = bpf_map_lookup_elem(&array_map, &key); 58bd4aed0eSJiong Wang if (!q) 59bd4aed0eSJiong Wang goto err; 60bd4aed0eSJiong Wang bpf_spin_lock(&q->lock); 61bd4aed0eSJiong Wang for (i = 0; i < VAR_NUM; i++) 62bd4aed0eSJiong Wang q->var[i] = rnd; 63bd4aed0eSJiong Wang bpf_spin_unlock(&q->lock); 64bd4aed0eSJiong Wang err = 0; 65bd4aed0eSJiong Wang err: 66bd4aed0eSJiong Wang return err; 67bd4aed0eSJiong Wang } 68bd4aed0eSJiong Wang char _license[] SEC("license") = "GPL"; 69