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9p
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drwxr-xr-x
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bluetooth
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caif
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6lowpan.h
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inetpeer.h
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ip.h
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ipv6.h
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Rename
/* * 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 <e1000-devel@lists.sourceforge.net> */ #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); } /* when used in sock_poll() nonblock is known at compile time to be true * so the loop and end_time will be optimized out */ static inline bool sk_busy_loop(struct sock *sk, int nonblock) { unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0; const struct net_device_ops *ops; struct napi_struct *napi; int rc = false; /* * rcu read lock for napi hash * bh so we don't race with net_rx_action */ rcu_read_lock_bh(); napi = napi_by_id(sk->sk_napi_id); if (!napi) goto out; ops = napi->dev->netdev_ops; if (!ops || !ops->ndo_busy_poll) goto out; do { rc = ops->ndo_busy_poll(napi); if (rc == LL_FLUSH_FAILED) break; /* permanent failure */ if (rc > 0) /* local bh are disabled so it is ok to use _BH */ NET_ADD_STATS_BH(sock_net(sk), LINUX_MIB_BUSYPOLLRXPACKETS, rc); cpu_relax(); } while (!nonblock && skb_queue_empty(&sk->sk_receive_queue) && !need_resched() && !busy_loop_timeout(end_time)); rc = !skb_queue_empty(&sk->sk_receive_queue); out: rcu_read_unlock_bh(); return rc; } /* 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 */