1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Facebook
4 #include <linux/version.h>
5 #include "bpf_helpers.h"
9 struct bpf_spin_lock lock;
14 __uint(type, BPF_MAP_TYPE_HASH);
15 __uint(max_entries, 1);
17 __type(value, struct hmap_elem);
21 struct bpf_spin_lock lock;
26 __uint(type, BPF_MAP_TYPE_CGROUP_STORAGE);
27 __type(key, struct bpf_cgroup_storage_key);
28 __type(value, struct cls_elem);
29 } cls_map SEC(".maps");
32 struct bpf_spin_lock lock;
34 unsigned long long lasttime;
40 __uint(type, BPF_MAP_TYPE_ARRAY);
41 __uint(max_entries, 1);
43 __type(value, struct bpf_vqueue);
44 } vqueue SEC(".maps");
46 #define CREDIT_PER_NS(delta, rate) (((delta) * rate) >> 20)
49 int bpf_sping_lock_test(struct __sk_buff *skb)
51 volatile int credit = 0, max_credit = 100, pkt_len = 64;
52 struct hmap_elem zero = {}, *val;
53 unsigned long long curtime;
59 val = bpf_map_lookup_elem(&hmap, &key);
61 bpf_map_update_elem(&hmap, &key, &zero, 0);
62 val = bpf_map_lookup_elem(&hmap, &key);
68 /* spin_lock in hash map run time test */
69 bpf_spin_lock(&val->lock);
74 if (val->cnt != 0 && val->cnt != 1)
76 bpf_spin_unlock(&val->lock);
78 /* spin_lock in array. virtual queue demo */
79 q = bpf_map_lookup_elem(&vqueue, &key);
82 curtime = bpf_ktime_get_ns();
83 bpf_spin_lock(&q->lock);
84 q->credit += CREDIT_PER_NS(curtime - q->lasttime, q->rate);
85 q->lasttime = curtime;
86 if (q->credit > max_credit)
87 q->credit = max_credit;
90 bpf_spin_unlock(&q->lock);
92 /* spin_lock in cgroup local storage */
93 cls = bpf_get_local_storage(&cls_map, 0);
94 bpf_spin_lock(&cls->lock);
96 bpf_spin_unlock(&cls->lock);
101 char _license[] SEC("license") = "GPL";