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1/*
2 * net busy poll support
3 * Copyright(c) 2013 Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Author: Eliezer Tamir
19 *
20 * Contact Information:
21 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
22 */
23
24#ifndef _LINUX_NET_BUSY_POLL_H
25#define _LINUX_NET_BUSY_POLL_H
26
27#include <linux/netdevice.h>
28#include <linux/sched/clock.h>
29#include <linux/sched/signal.h>
30#include <net/ip.h>
31
32/* 0 - Reserved to indicate value not set
33 * 1..NR_CPUS - Reserved for sender_cpu
34 * NR_CPUS+1..~0 - Region available for NAPI IDs
35 */
36#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))
37
38#ifdef CONFIG_NET_RX_BUSY_POLL
39
40struct napi_struct;
41extern unsigned int sysctl_net_busy_read __read_mostly;
42extern unsigned int sysctl_net_busy_poll __read_mostly;
43
44static inline bool net_busy_loop_on(void)
45{
46 return sysctl_net_busy_poll;
47}
48
49static inline bool sk_can_busy_loop(const struct sock *sk)
50{
51 return sk->sk_ll_usec && !signal_pending(current);
52}
53
54bool sk_busy_loop_end(void *p, unsigned long start_time);
55
56void napi_busy_loop(unsigned int napi_id,
57 bool (*loop_end)(void *, unsigned long),
58 void *loop_end_arg);
59
60#else /* CONFIG_NET_RX_BUSY_POLL */
61static inline unsigned long net_busy_loop_on(void)
62{
63 return 0;
64}
65
66static inline bool sk_can_busy_loop(struct sock *sk)
67{
68 return false;
69}
70
71#endif /* CONFIG_NET_RX_BUSY_POLL */
72
73static inline unsigned long busy_loop_current_time(void)
74{
75#ifdef CONFIG_NET_RX_BUSY_POLL
76 return (unsigned long)(local_clock() >> 10);
77#else
78 return 0;
79#endif
80}
81
82/* in poll/select we use the global sysctl_net_ll_poll value */
83static inline bool busy_loop_timeout(unsigned long start_time)
84{
85#ifdef CONFIG_NET_RX_BUSY_POLL
86 unsigned long bp_usec = READ_ONCE(sysctl_net_busy_poll);
87
88 if (bp_usec) {
89 unsigned long end_time = start_time + bp_usec;
90 unsigned long now = busy_loop_current_time();
91
92 return time_after(now, end_time);
93 }
94#endif
95 return true;
96}
97
98static inline bool sk_busy_loop_timeout(struct sock *sk,
99 unsigned long start_time)
100{
101#ifdef CONFIG_NET_RX_BUSY_POLL
102 unsigned long bp_usec = READ_ONCE(sk->sk_ll_usec);
103
104 if (bp_usec) {
105 unsigned long end_time = start_time + bp_usec;
106 unsigned long now = busy_loop_current_time();
107
108 return time_after(now, end_time);
109 }
110#endif
111 return true;
112}
113
114static inline void sk_busy_loop(struct sock *sk, int nonblock)
115{
116#ifdef CONFIG_NET_RX_BUSY_POLL
117 unsigned int napi_id = READ_ONCE(sk->sk_napi_id);
118
119 if (napi_id >= MIN_NAPI_ID)
120 napi_busy_loop(napi_id, nonblock ? NULL : sk_busy_loop_end, sk);
121#endif
122}
123
124/* used in the NIC receive handler to mark the skb */
125static inline void skb_mark_napi_id(struct sk_buff *skb,
126 struct napi_struct *napi)
127{
128#ifdef CONFIG_NET_RX_BUSY_POLL
129 skb->napi_id = napi->napi_id;
130#endif
131}
132
133/* used in the protocol hanlder to propagate the napi_id to the socket */
134static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb)
135{
136#ifdef CONFIG_NET_RX_BUSY_POLL
137 sk->sk_napi_id = skb->napi_id;
138#endif
139}
140
141/* variant used for unconnected sockets */
142static inline void sk_mark_napi_id_once(struct sock *sk,
143 const struct sk_buff *skb)
144{
145#ifdef CONFIG_NET_RX_BUSY_POLL
146 if (!sk->sk_napi_id)
147 sk->sk_napi_id = skb->napi_id;
148#endif
149}
150
151#endif /* _LINUX_NET_BUSY_POLL_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * net busy poll support
4 * Copyright(c) 2013 Intel Corporation.
5 *
6 * Author: Eliezer Tamir
7 *
8 * Contact Information:
9 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
10 */
11
12#ifndef _LINUX_NET_BUSY_POLL_H
13#define _LINUX_NET_BUSY_POLL_H
14
15#include <linux/netdevice.h>
16#include <linux/sched/clock.h>
17#include <linux/sched/signal.h>
18#include <net/ip.h>
19
20/* 0 - Reserved to indicate value not set
21 * 1..NR_CPUS - Reserved for sender_cpu
22 * NR_CPUS+1..~0 - Region available for NAPI IDs
23 */
24#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))
25
26#ifdef CONFIG_NET_RX_BUSY_POLL
27
28struct napi_struct;
29extern unsigned int sysctl_net_busy_read __read_mostly;
30extern unsigned int sysctl_net_busy_poll __read_mostly;
31
32static inline bool net_busy_loop_on(void)
33{
34 return sysctl_net_busy_poll;
35}
36
37static inline bool sk_can_busy_loop(const struct sock *sk)
38{
39 return sk->sk_ll_usec && !signal_pending(current);
40}
41
42bool sk_busy_loop_end(void *p, unsigned long start_time);
43
44void napi_busy_loop(unsigned int napi_id,
45 bool (*loop_end)(void *, unsigned long),
46 void *loop_end_arg);
47
48#else /* CONFIG_NET_RX_BUSY_POLL */
49static inline unsigned long net_busy_loop_on(void)
50{
51 return 0;
52}
53
54static inline bool sk_can_busy_loop(struct sock *sk)
55{
56 return false;
57}
58
59#endif /* CONFIG_NET_RX_BUSY_POLL */
60
61static inline unsigned long busy_loop_current_time(void)
62{
63#ifdef CONFIG_NET_RX_BUSY_POLL
64 return (unsigned long)(local_clock() >> 10);
65#else
66 return 0;
67#endif
68}
69
70/* in poll/select we use the global sysctl_net_ll_poll value */
71static inline bool busy_loop_timeout(unsigned long start_time)
72{
73#ifdef CONFIG_NET_RX_BUSY_POLL
74 unsigned long bp_usec = READ_ONCE(sysctl_net_busy_poll);
75
76 if (bp_usec) {
77 unsigned long end_time = start_time + bp_usec;
78 unsigned long now = busy_loop_current_time();
79
80 return time_after(now, end_time);
81 }
82#endif
83 return true;
84}
85
86static inline bool sk_busy_loop_timeout(struct sock *sk,
87 unsigned long start_time)
88{
89#ifdef CONFIG_NET_RX_BUSY_POLL
90 unsigned long bp_usec = READ_ONCE(sk->sk_ll_usec);
91
92 if (bp_usec) {
93 unsigned long end_time = start_time + bp_usec;
94 unsigned long now = busy_loop_current_time();
95
96 return time_after(now, end_time);
97 }
98#endif
99 return true;
100}
101
102static inline void sk_busy_loop(struct sock *sk, int nonblock)
103{
104#ifdef CONFIG_NET_RX_BUSY_POLL
105 unsigned int napi_id = READ_ONCE(sk->sk_napi_id);
106
107 if (napi_id >= MIN_NAPI_ID)
108 napi_busy_loop(napi_id, nonblock ? NULL : sk_busy_loop_end, sk);
109#endif
110}
111
112/* used in the NIC receive handler to mark the skb */
113static inline void skb_mark_napi_id(struct sk_buff *skb,
114 struct napi_struct *napi)
115{
116#ifdef CONFIG_NET_RX_BUSY_POLL
117 /* If the skb was already marked with a valid NAPI ID, avoid overwriting
118 * it.
119 */
120 if (skb->napi_id < MIN_NAPI_ID)
121 skb->napi_id = napi->napi_id;
122#endif
123}
124
125/* used in the protocol hanlder to propagate the napi_id to the socket */
126static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb)
127{
128#ifdef CONFIG_NET_RX_BUSY_POLL
129 WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
130#endif
131 sk_rx_queue_set(sk, skb);
132}
133
134/* variant used for unconnected sockets */
135static inline void sk_mark_napi_id_once(struct sock *sk,
136 const struct sk_buff *skb)
137{
138#ifdef CONFIG_NET_RX_BUSY_POLL
139 if (!READ_ONCE(sk->sk_napi_id))
140 WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
141#endif
142}
143
144#endif /* _LINUX_NET_BUSY_POLL_H */