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
18int __io_napi_add_id(struct io_ring_ctx *ctx, unsigned int napi_id);
19
20void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq);
21int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx);
22
23static inline bool io_napi(struct io_ring_ctx *ctx)
24{
25	return !list_empty(&ctx->napi_list);
26}
27
28static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
29				     struct io_wait_queue *iowq)
30{
31	if (!io_napi(ctx))
32		return;
33	__io_napi_busy_loop(ctx, iowq);
34}
35
36/*
37 * io_napi_add() - Add napi id to the busy poll list
38 * @req: pointer to io_kiocb request
39 *
40 * Add the napi id of the socket to the napi busy poll list and hash table.
41 */
42static inline void io_napi_add(struct io_kiocb *req)
43{
44	struct io_ring_ctx *ctx = req->ctx;
45	struct socket *sock;
46
47	if (READ_ONCE(ctx->napi_track_mode) != IO_URING_NAPI_TRACKING_DYNAMIC)
48		return;
49
50	sock = sock_from_file(req->file);
51	if (sock && sock->sk)
52		__io_napi_add_id(ctx, READ_ONCE(sock->sk->sk_napi_id));
53}
54
55#else
56
57static inline void io_napi_init(struct io_ring_ctx *ctx)
58{
59}
60static inline void io_napi_free(struct io_ring_ctx *ctx)
61{
62}
63static inline int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
64{
65	return -EOPNOTSUPP;
66}
67static inline int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
68{
69	return -EOPNOTSUPP;
70}
71static inline bool io_napi(struct io_ring_ctx *ctx)
72{
73	return false;
74}
75static inline void io_napi_add(struct io_kiocb *req)
76{
77}
78static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
79				     struct io_wait_queue *iowq)
80{
81}
82static inline int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx)
83{
84	return 0;
85}
86#endif /* CONFIG_NET_RX_BUSY_POLL */
87
88#endif