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
12 void io_napi_init(struct io_ring_ctx *ctx);
13 void io_napi_free(struct io_ring_ctx *ctx);
14
15 int io_register_napi(struct io_ring_ctx *ctx, void __user *arg);
16 int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg);
17
18 void __io_napi_add(struct io_ring_ctx *ctx, struct socket *sock);
19
20 void __io_napi_adjust_timeout(struct io_ring_ctx *ctx,
21 struct io_wait_queue *iowq, ktime_t to_wait);
22 void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq);
23 int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx);
24
25 static inline bool io_napi(struct io_ring_ctx *ctx)
26 {
27 return !list_empty(&ctx->napi_list);
28 }
29
30 static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
31 struct io_wait_queue *iowq,
32 ktime_t to_wait)
33 {
34 if (!io_napi(ctx))
35 return;
36 __io_napi_adjust_timeout(ctx, iowq, to_wait);
37 }
38
39 static 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 */
53 static 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_enabled))
59 return;
60
61 sock = sock_from_file(req->file);
62 if (sock)
63 __io_napi_add(ctx, sock);
64 }
65
66 #else
67
68 static inline void io_napi_init(struct io_ring_ctx *ctx)
69 {
70 }
71 static inline void io_napi_free(struct io_ring_ctx *ctx)
72 {
73 }
74 static inline int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
75 {
76 return -EOPNOTSUPP;
77 }
78 static inline int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
79 {
80 return -EOPNOTSUPP;
81 }
82 static inline bool io_napi(struct io_ring_ctx *ctx)
83 {
84 return false;
85 }
86 static inline void io_napi_add(struct io_kiocb *req)
87 {
88 }
89 static inline void io_napi_adjust_timeout(struct io_ring_ctx *ctx,
90 struct io_wait_queue *iowq,
91 ktime_t to_wait)
92 {
93 }
94 static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
95 struct io_wait_queue *iowq)
96 {
97 }
98 static 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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.