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(&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(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