1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef IOU_NAPI_H
4#define IOU_NAPI_H
5
6#include <linux/kernel.h>
7#include <linux/io_uring.h>
8#include <net/busy_poll.h>
9
10#ifdef CONFIG_NET_RX_BUSY_POLL
11
12void io_napi_init(struct io_ring_ctx *ctx);
13void io_napi_free(struct io_ring_ctx *ctx);
14
15int io_register_napi(struct io_ring_ctx *ctx, void __user *arg);
16int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg);
17
18void __io_napi_add(struct io_ring_ctx *ctx, struct socket *sock);
19
20void __io_napi_adjust_timeout(struct io_ring_ctx *ctx,
21 struct io_wait_queue *iowq, struct timespec64 *ts);
22void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq);
23int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx);
24
25static inline bool io_napi(struct io_ring_ctx *ctx)
26{
27 return !list_empty(head: &ctx->napi_list);
28}
29
30static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
31 struct io_wait_queue *iowq,
32 struct timespec64 *ts)
33{
34 if (!io_napi(ctx))
35 return;
36 __io_napi_adjust_timeout(ctx, iowq, ts);
37}
38
39static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
40 struct io_wait_queue *iowq)
41{
42 if (!io_napi(ctx))
43 return;
44 __io_napi_busy_loop(ctx, iowq);
45}
46
47/*
48 * io_napi_add() - Add napi id to the busy poll list
49 * @req: pointer to io_kiocb request
50 *
51 * Add the napi id of the socket to the napi busy poll list and hash table.
52 */
53static inline void io_napi_add(struct io_kiocb *req)
54{
55 struct io_ring_ctx *ctx = req->ctx;
56 struct socket *sock;
57
58 if (!READ_ONCE(ctx->napi_busy_poll_to))
59 return;
60
61 sock = sock_from_file(file: req->file);
62 if (sock)
63 __io_napi_add(ctx, sock);
64}
65
66#else
67
68static inline void io_napi_init(struct io_ring_ctx *ctx)
69{
70}
71static inline void io_napi_free(struct io_ring_ctx *ctx)
72{
73}
74static inline int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
75{
76 return -EOPNOTSUPP;
77}
78static inline int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
79{
80 return -EOPNOTSUPP;
81}
82static inline bool io_napi(struct io_ring_ctx *ctx)
83{
84 return false;
85}
86static inline void io_napi_add(struct io_kiocb *req)
87{
88}
89static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
90 struct io_wait_queue *iowq,
91 struct timespec64 *ts)
92{
93}
94static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
95 struct io_wait_queue *iowq)
96{
97}
98static inline int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx)
99{
100 return 0;
101}
102#endif /* CONFIG_NET_RX_BUSY_POLL */
103
104#endif
105

source code of linux/io_uring/napi.h