Commit | Line | Data |
---|---|---|
06021292 | 1 | /* |
8b80cda5 | 2 | * net busy poll support |
06021292 ET |
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 | ||
8b80cda5 ET |
24 | #ifndef _LINUX_NET_BUSY_POLL_H |
25 | #define _LINUX_NET_BUSY_POLL_H | |
06021292 ET |
26 | |
27 | #include <linux/netdevice.h> | |
28 | #include <net/ip.h> | |
29 | ||
e0d1095a | 30 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 ET |
31 | |
32 | struct napi_struct; | |
64b0dc51 ET |
33 | extern unsigned int sysctl_net_busy_read __read_mostly; |
34 | extern unsigned int sysctl_net_busy_poll __read_mostly; | |
06021292 ET |
35 | |
36 | /* return values from ndo_ll_poll */ | |
37 | #define LL_FLUSH_FAILED -1 | |
38 | #define LL_FLUSH_BUSY -2 | |
39 | ||
cbf55001 | 40 | static inline bool net_busy_loop_on(void) |
91e2fd33 | 41 | { |
64b0dc51 | 42 | return sysctl_net_busy_poll; |
91e2fd33 ET |
43 | } |
44 | ||
76b1e9b9 | 45 | static inline u64 busy_loop_us_clock(void) |
ad6276e0 | 46 | { |
37089834 | 47 | return local_clock() >> 10; |
ad6276e0 | 48 | } |
ad6276e0 | 49 | |
76b1e9b9 | 50 | static inline unsigned long sk_busy_loop_end_time(struct sock *sk) |
06021292 | 51 | { |
76b1e9b9 | 52 | return busy_loop_us_clock() + ACCESS_ONCE(sk->sk_ll_usec); |
2d48d67f | 53 | } |
9a3c71aa | 54 | |
76b1e9b9 ET |
55 | /* in poll/select we use the global sysctl_net_ll_poll value */ |
56 | static inline unsigned long busy_loop_end_time(void) | |
1bc2774d | 57 | { |
64b0dc51 | 58 | return busy_loop_us_clock() + ACCESS_ONCE(sysctl_net_busy_poll); |
06021292 ET |
59 | } |
60 | ||
cbf55001 | 61 | static inline bool sk_can_busy_loop(struct sock *sk) |
06021292 | 62 | { |
dafcc438 | 63 | return sk->sk_ll_usec && sk->sk_napi_id && |
06021292 ET |
64 | !need_resched() && !signal_pending(current); |
65 | } | |
66 | ||
76b1e9b9 ET |
67 | |
68 | static inline bool busy_loop_timeout(unsigned long end_time) | |
06021292 | 69 | { |
76b1e9b9 | 70 | unsigned long now = busy_loop_us_clock(); |
1bc2774d | 71 | |
76b1e9b9 | 72 | return time_after(now, end_time); |
06021292 ET |
73 | } |
74 | ||
02d62e86 | 75 | bool sk_busy_loop(struct sock *sk, int nonblock); |
06021292 ET |
76 | |
77 | /* used in the NIC receive handler to mark the skb */ | |
8b80cda5 ET |
78 | static inline void skb_mark_napi_id(struct sk_buff *skb, |
79 | struct napi_struct *napi) | |
06021292 ET |
80 | { |
81 | skb->napi_id = napi->napi_id; | |
82 | } | |
83 | ||
84 | /* used in the protocol hanlder to propagate the napi_id to the socket */ | |
8b80cda5 | 85 | static inline void sk_mark_napi_id(struct sock *sk, struct sk_buff *skb) |
06021292 ET |
86 | { |
87 | sk->sk_napi_id = skb->napi_id; | |
88 | } | |
89 | ||
e0d1095a | 90 | #else /* CONFIG_NET_RX_BUSY_POLL */ |
cbf55001 | 91 | static inline unsigned long net_busy_loop_on(void) |
91e2fd33 ET |
92 | { |
93 | return 0; | |
94 | } | |
06021292 | 95 | |
76b1e9b9 | 96 | static inline unsigned long busy_loop_end_time(void) |
06021292 ET |
97 | { |
98 | return 0; | |
99 | } | |
100 | ||
cbf55001 | 101 | static inline bool sk_can_busy_loop(struct sock *sk) |
06021292 ET |
102 | { |
103 | return false; | |
104 | } | |
105 | ||
8b80cda5 ET |
106 | static inline void skb_mark_napi_id(struct sk_buff *skb, |
107 | struct napi_struct *napi) | |
06021292 ET |
108 | { |
109 | } | |
110 | ||
8b80cda5 | 111 | static inline void sk_mark_napi_id(struct sock *sk, struct sk_buff *skb) |
06021292 ET |
112 | { |
113 | } | |
114 | ||
76b1e9b9 | 115 | static inline bool busy_loop_timeout(unsigned long end_time) |
06021292 | 116 | { |
76b1e9b9 | 117 | return true; |
06021292 ET |
118 | } |
119 | ||
dfcefb0b CW |
120 | static inline bool sk_busy_loop(struct sock *sk, int nonblock) |
121 | { | |
122 | return false; | |
123 | } | |
124 | ||
e0d1095a | 125 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |
8b80cda5 | 126 | #endif /* _LINUX_NET_BUSY_POLL_H */ |