Contributors: 19
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Eliezer Tamir |
166 |
24.74% |
10 |
21.74% |
| Eric Dumazet |
132 |
19.67% |
8 |
17.39% |
| Alexander Duyck |
116 |
17.29% |
3 |
6.52% |
| Sridhar Samudrala |
93 |
13.86% |
1 |
2.17% |
| Björn Töpel |
59 |
8.79% |
3 |
6.52% |
| Andi Kleen |
25 |
3.73% |
1 |
2.17% |
| Amritha Nambiar |
15 |
2.24% |
2 |
4.35% |
| Linus Torvalds (pre-git) |
15 |
2.24% |
5 |
10.87% |
| Daniel Borkmann |
13 |
1.94% |
1 |
2.17% |
| Américo Wang |
8 |
1.19% |
2 |
4.35% |
| Ingo Molnar |
6 |
0.89% |
2 |
4.35% |
| Patrick Ohly |
5 |
0.75% |
1 |
2.17% |
| Stephen Hemminger |
4 |
0.60% |
1 |
2.17% |
| Kuniyuki Iwashima |
3 |
0.45% |
1 |
2.17% |
| Jesper Dangaard Brouer |
3 |
0.45% |
1 |
2.17% |
| Hannes Eder |
3 |
0.45% |
1 |
2.17% |
| Stefan Roesch |
2 |
0.30% |
1 |
2.17% |
| Thomas Gleixner |
2 |
0.30% |
1 |
2.17% |
| Jeff Garzik |
1 |
0.15% |
1 |
2.17% |
| Total |
671 |
|
46 |
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* net busy poll support
* Copyright(c) 2013 Intel Corporation.
*
* 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>
#include <net/xdp.h>
/* 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))
#define BUSY_POLL_BUDGET 8
#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;
static inline bool net_busy_loop_on(void)
{
return READ_ONCE(sysctl_net_busy_poll);
}
static inline bool sk_can_busy_loop(const struct sock *sk)
{
return READ_ONCE(sk->sk_ll_usec) && !signal_pending(current);
}
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, bool prefer_busy_poll, u16 budget);
void napi_busy_loop_rcu(unsigned int napi_id,
bool (*loop_end)(void *, unsigned long),
void *loop_end_arg, bool prefer_busy_poll, u16 budget);
#else /* CONFIG_NET_RX_BUSY_POLL */
static inline unsigned long net_busy_loop_on(void)
{
return 0;
}
static inline bool sk_can_busy_loop(struct sock *sk)
{
return false;
}
#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
}
/* 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;
}
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;
}
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,
READ_ONCE(sk->sk_prefer_busy_poll),
READ_ONCE(sk->sk_busy_poll_budget) ?: BUSY_POLL_BUDGET);
#endif
}
/* 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
/* If the skb was already marked with a valid NAPI ID, avoid overwriting
* it.
*/
if (skb->napi_id < MIN_NAPI_ID)
skb->napi_id = napi->napi_id;
#endif
}
/* 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
if (unlikely(READ_ONCE(sk->sk_napi_id) != skb->napi_id))
WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
#endif
sk_rx_queue_update(sk, skb);
}
/* Variant of sk_mark_napi_id() for passive flow setup,
* as sk->sk_napi_id and sk->sk_rx_queue_mapping content
* needs to be set.
*/
static inline void sk_mark_napi_id_set(struct sock *sk,
const struct sk_buff *skb)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
#endif
sk_rx_queue_set(sk, skb);
}
static inline void __sk_mark_napi_id_once(struct sock *sk, unsigned int napi_id)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
if (!READ_ONCE(sk->sk_napi_id))
WRITE_ONCE(sk->sk_napi_id, napi_id);
#endif
}
/* 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
__sk_mark_napi_id_once(sk, skb->napi_id);
#endif
}
static inline void sk_mark_napi_id_once_xdp(struct sock *sk,
const struct xdp_buff *xdp)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
__sk_mark_napi_id_once(sk, xdp->rxq->napi_id);
#endif
}
#endif /* _LINUX_NET_BUSY_POLL_H */