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Release 4.12 include/net/busy_poll.h

Directory: include/net
/*
 * 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 <linux/sched/clock.h>
#include <linux/sched/signal.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;

/*              0 - Reserved to indicate value not set
 *     1..NR_CPUS - Reserved for sender_cpu
 *  NR_CPUS+1..~0 - Region available for NAPI IDs
 */

#define MIN_NAPI_ID ((unsigned int)(NR_CPUS + 1))


static inline bool net_busy_loop_on(void) { return sysctl_net_busy_poll; }

Contributors

PersonTokensPropCommitsCommitProp
Eliezer Tamir12100.00%3100.00%
Total12100.00%3100.00%


static inline bool sk_can_busy_loop(const struct sock *sk) { return sk->sk_ll_usec && !signal_pending(current); }

Contributors

PersonTokensPropCommitsCommitProp
Eliezer Tamir2395.83%375.00%
Eric Dumazet14.17%125.00%
Total24100.00%4100.00%

bool sk_busy_loop_end(void *p, unsigned long start_time); void napi_busy_loop(unsigned int napi_id, bool (*loop_end)(void *, unsigned long), void *loop_end_arg); #else /* CONFIG_NET_RX_BUSY_POLL */
static inline unsigned long net_busy_loop_on(void) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eliezer Tamir13100.00%2100.00%
Total13100.00%2100.00%


static inline bool sk_can_busy_loop(struct sock *sk) { return false; }

Contributors

PersonTokensPropCommitsCommitProp
Eliezer Tamir853.33%150.00%
Alexander Duyck746.67%150.00%
Total15100.00%2100.00%

#endif /* CONFIG_NET_RX_BUSY_POLL */
static inline unsigned long busy_loop_current_time(void) { #ifdef CONFIG_NET_RX_BUSY_POLL return (unsigned long)(local_clock() >> 10); #else return 0; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck2784.38%150.00%
Eliezer Tamir515.62%150.00%
Total32100.00%2100.00%

/* in poll/select we use the global sysctl_net_ll_poll value */
static inline bool busy_loop_timeout(unsigned long start_time) { #ifdef CONFIG_NET_RX_BUSY_POLL unsigned long bp_usec = READ_ONCE(sysctl_net_busy_poll); if (bp_usec) { unsigned long end_time = start_time + bp_usec; unsigned long now = busy_loop_current_time(); return time_after(now, end_time); } #endif return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck4477.19%133.33%
Eliezer Tamir1322.81%266.67%
Total57100.00%3100.00%


static inline bool sk_busy_loop_timeout(struct sock *sk, unsigned long start_time) { #ifdef CONFIG_NET_RX_BUSY_POLL unsigned long bp_usec = READ_ONCE(sk->sk_ll_usec); if (bp_usec) { unsigned long end_time = start_time + bp_usec; unsigned long now = busy_loop_current_time(); return time_after(now, end_time); } #endif return true; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck5382.81%133.33%
Américo Wang914.06%133.33%
Eliezer Tamir23.12%133.33%
Total64100.00%3100.00%


static inline void sk_busy_loop(struct sock *sk, int nonblock) { #ifdef CONFIG_NET_RX_BUSY_POLL unsigned int napi_id = READ_ONCE(sk->sk_napi_id); if (napi_id >= MIN_NAPI_ID) napi_busy_loop(napi_id, nonblock ? NULL : sk_busy_loop_end, sk); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Sridhar Samudrala50100.00%1100.00%
Total50100.00%1100.00%

/* 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) { #ifdef CONFIG_NET_RX_BUSY_POLL skb->napi_id = napi->napi_id; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck30100.00%1100.00%
Total30100.00%1100.00%

/* used in the protocol hanlder to propagate the napi_id to the socket */
static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb) { #ifdef CONFIG_NET_RX_BUSY_POLL sk->sk_napi_id = skb->napi_id; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet31100.00%1100.00%
Total31100.00%1100.00%

/* variant used for unconnected sockets */
static inline void sk_mark_napi_id_once(struct sock *sk, const struct sk_buff *skb) { #ifdef CONFIG_NET_RX_BUSY_POLL if (!sk->sk_napi_id) sk->sk_napi_id = skb->napi_id; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet38100.00%1100.00%
Total38100.00%1100.00%

#endif /* _LINUX_NET_BUSY_POLL_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck17137.34%315.00%
Eliezer Tamir11625.33%945.00%
Sridhar Samudrala8117.69%15.00%
Eric Dumazet7315.94%315.00%
Américo Wang112.40%210.00%
Ingo Molnar61.31%210.00%
Total458100.00%20100.00%
Directory: include/net
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