forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
3.0 KiB
126 lines
3.0 KiB
/* |
|
* net busy poll support |
|
* Copyright(c) 2013 Intel Corporation. |
|
* |
|
* This program is free software; you can redistribute it and/or modify it |
|
* under the terms and conditions of the GNU General Public License, |
|
* version 2, as published by the Free Software Foundation. |
|
* |
|
* This program is distributed in the hope it will be useful, but WITHOUT |
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
|
* more details. |
|
* |
|
* You should have received a copy of the GNU General Public License along with |
|
* this program; if not, write to the Free Software Foundation, Inc., |
|
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
|
* |
|
* Author: Eliezer Tamir |
|
* |
|
* Contact Information: |
|
* e1000-devel Mailing List <[email protected]> |
|
*/ |
|
|
|
#ifndef _LINUX_NET_BUSY_POLL_H |
|
#define _LINUX_NET_BUSY_POLL_H |
|
|
|
#include <linux/netdevice.h> |
|
#include <net/ip.h> |
|
|
|
#ifdef CONFIG_NET_RX_BUSY_POLL |
|
|
|
struct napi_struct; |
|
extern unsigned int sysctl_net_busy_read __read_mostly; |
|
extern unsigned int sysctl_net_busy_poll __read_mostly; |
|
|
|
/* return values from ndo_ll_poll */ |
|
#define LL_FLUSH_FAILED -1 |
|
#define LL_FLUSH_BUSY -2 |
|
|
|
static inline bool net_busy_loop_on(void) |
|
{ |
|
return sysctl_net_busy_poll; |
|
} |
|
|
|
static inline u64 busy_loop_us_clock(void) |
|
{ |
|
return local_clock() >> 10; |
|
} |
|
|
|
static inline unsigned long sk_busy_loop_end_time(struct sock *sk) |
|
{ |
|
return busy_loop_us_clock() + ACCESS_ONCE(sk->sk_ll_usec); |
|
} |
|
|
|
/* in poll/select we use the global sysctl_net_ll_poll value */ |
|
static inline unsigned long busy_loop_end_time(void) |
|
{ |
|
return busy_loop_us_clock() + ACCESS_ONCE(sysctl_net_busy_poll); |
|
} |
|
|
|
static inline bool sk_can_busy_loop(struct sock *sk) |
|
{ |
|
return sk->sk_ll_usec && sk->sk_napi_id && |
|
!need_resched() && !signal_pending(current); |
|
} |
|
|
|
|
|
static inline bool busy_loop_timeout(unsigned long end_time) |
|
{ |
|
unsigned long now = busy_loop_us_clock(); |
|
|
|
return time_after(now, end_time); |
|
} |
|
|
|
bool sk_busy_loop(struct sock *sk, int nonblock); |
|
|
|
/* used in the NIC receive handler to mark the skb */ |
|
static inline void skb_mark_napi_id(struct sk_buff *skb, |
|
struct napi_struct *napi) |
|
{ |
|
skb->napi_id = napi->napi_id; |
|
} |
|
|
|
/* used in the protocol hanlder to propagate the napi_id to the socket */ |
|
static inline void sk_mark_napi_id(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
sk->sk_napi_id = skb->napi_id; |
|
} |
|
|
|
#else /* CONFIG_NET_RX_BUSY_POLL */ |
|
static inline unsigned long net_busy_loop_on(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline unsigned long busy_loop_end_time(void) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline bool sk_can_busy_loop(struct sock *sk) |
|
{ |
|
return false; |
|
} |
|
|
|
static inline void skb_mark_napi_id(struct sk_buff *skb, |
|
struct napi_struct *napi) |
|
{ |
|
} |
|
|
|
static inline void sk_mark_napi_id(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
} |
|
|
|
static inline bool busy_loop_timeout(unsigned long end_time) |
|
{ |
|
return true; |
|
} |
|
|
|
static inline bool sk_busy_loop(struct sock *sk, int nonblock) |
|
{ |
|
return false; |
|
} |
|
|
|
#endif /* CONFIG_NET_RX_BUSY_POLL */ |
|
#endif /* _LINUX_NET_BUSY_POLL_H */
|
|
|