1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _PROTO_MEMORY_H
3#define _PROTO_MEMORY_H
4
5#include <net/sock.h>
6#include <net/hotdata.h>
7
8/* 1 MB per cpu, in page units */
9#define SK_MEMORY_PCPU_RESERVE (1 << (20 - PAGE_SHIFT))
10
11static inline bool sk_has_memory_pressure(const struct sock *sk)
12{
13 return sk->sk_prot->memory_pressure != NULL;
14}
15
16static inline bool
17proto_memory_pressure(const struct proto *prot)
18{
19 if (!prot->memory_pressure)
20 return false;
21 return !!READ_ONCE(*prot->memory_pressure);
22}
23
24static inline bool sk_under_global_memory_pressure(const struct sock *sk)
25{
26 return proto_memory_pressure(prot: sk->sk_prot);
27}
28
29static inline bool sk_under_memory_pressure(const struct sock *sk)
30{
31 if (!sk->sk_prot->memory_pressure)
32 return false;
33
34 if (mem_cgroup_sk_enabled(sk) &&
35 mem_cgroup_sk_under_memory_pressure(sk))
36 return true;
37
38 return !!READ_ONCE(*sk->sk_prot->memory_pressure);
39}
40
41static inline long
42proto_memory_allocated(const struct proto *prot)
43{
44 return max(0L, atomic_long_read(prot->memory_allocated));
45}
46
47static inline long
48sk_memory_allocated(const struct sock *sk)
49{
50 return proto_memory_allocated(prot: sk->sk_prot);
51}
52
53static inline void proto_memory_pcpu_drain(struct proto *proto)
54{
55 int val = this_cpu_xchg(*proto->per_cpu_fw_alloc, 0);
56
57 if (val)
58 atomic_long_add(i: val, v: proto->memory_allocated);
59}
60
61static inline void
62sk_memory_allocated_add(const struct sock *sk, int val)
63{
64 struct proto *proto = sk->sk_prot;
65
66 val = this_cpu_add_return(*proto->per_cpu_fw_alloc, val);
67
68 if (unlikely(val >= READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
69 proto_memory_pcpu_drain(proto);
70}
71
72static inline void
73sk_memory_allocated_sub(const struct sock *sk, int val)
74{
75 struct proto *proto = sk->sk_prot;
76
77 val = this_cpu_sub_return(*proto->per_cpu_fw_alloc, val);
78
79 if (unlikely(val <= -READ_ONCE(net_hotdata.sysctl_mem_pcpu_rsv)))
80 proto_memory_pcpu_drain(proto);
81}
82
83#endif /* _PROTO_MEMORY_H */
84