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Commit | Line | Data |
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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 | ||
21cb84c4 | 61 | static inline bool sk_can_busy_loop(const struct sock *sk) |
06021292 | 62 | { |
21cb84c4 | 63 | return sk->sk_ll_usec && sk->sk_napi_id && !signal_pending(current); |
06021292 ET |
64 | } |
65 | ||
76b1e9b9 ET |
66 | |
67 | static inline bool busy_loop_timeout(unsigned long end_time) | |
06021292 | 68 | { |
76b1e9b9 | 69 | unsigned long now = busy_loop_us_clock(); |
1bc2774d | 70 | |
76b1e9b9 | 71 | return time_after(now, end_time); |
06021292 ET |
72 | } |
73 | ||
02d62e86 | 74 | bool sk_busy_loop(struct sock *sk, int nonblock); |
06021292 ET |
75 | |
76 | /* used in the NIC receive handler to mark the skb */ | |
8b80cda5 ET |
77 | static inline void skb_mark_napi_id(struct sk_buff *skb, |
78 | struct napi_struct *napi) | |
06021292 ET |
79 | { |
80 | skb->napi_id = napi->napi_id; | |
81 | } | |
82 | ||
06021292 | 83 | |
e0d1095a | 84 | #else /* CONFIG_NET_RX_BUSY_POLL */ |
cbf55001 | 85 | static inline unsigned long net_busy_loop_on(void) |
91e2fd33 ET |
86 | { |
87 | return 0; | |
88 | } | |
06021292 | 89 | |
76b1e9b9 | 90 | static inline unsigned long busy_loop_end_time(void) |
06021292 ET |
91 | { |
92 | return 0; | |
93 | } | |
94 | ||
cbf55001 | 95 | static inline bool sk_can_busy_loop(struct sock *sk) |
06021292 ET |
96 | { |
97 | return false; | |
98 | } | |
99 | ||
8b80cda5 ET |
100 | static inline void skb_mark_napi_id(struct sk_buff *skb, |
101 | struct napi_struct *napi) | |
06021292 ET |
102 | { |
103 | } | |
104 | ||
76b1e9b9 | 105 | static inline bool busy_loop_timeout(unsigned long end_time) |
06021292 | 106 | { |
76b1e9b9 | 107 | return true; |
06021292 ET |
108 | } |
109 | ||
dfcefb0b CW |
110 | static inline bool sk_busy_loop(struct sock *sk, int nonblock) |
111 | { | |
112 | return false; | |
113 | } | |
114 | ||
e0d1095a | 115 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |
e68b6e50 ED |
116 | |
117 | /* used in the protocol hanlder to propagate the napi_id to the socket */ | |
118 | static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb) | |
119 | { | |
120 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
121 | sk->sk_napi_id = skb->napi_id; | |
122 | #endif | |
123 | } | |
124 | ||
125 | /* variant used for unconnected sockets */ | |
126 | static inline void sk_mark_napi_id_once(struct sock *sk, | |
127 | const struct sk_buff *skb) | |
128 | { | |
129 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
130 | if (!sk->sk_napi_id) | |
131 | sk->sk_napi_id = skb->napi_id; | |
132 | #endif | |
133 | } | |
134 | ||
8b80cda5 | 135 | #endif /* _LINUX_NET_BUSY_POLL_H */ |