io_uring/napi.h

Source file repositories/reference/linux-study-clean/io_uring/napi.h

File Facts

System
Linux kernel
Corpus path
io_uring/napi.h
Extension
.h
Size
2130 bytes
Lines
91
Domain
Kernel Services
Bucket
io_uring
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef IOU_NAPI_H
#define IOU_NAPI_H

#include <linux/kernel.h>
#include <linux/io_uring.h>
#include <net/busy_poll.h>

#ifdef CONFIG_NET_RX_BUSY_POLL

void io_napi_init(struct io_ring_ctx *ctx);
void io_napi_free(struct io_ring_ctx *ctx);

int io_register_napi(struct io_ring_ctx *ctx, void __user *arg);
int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg);

int __io_napi_add_id(struct io_ring_ctx *ctx, unsigned int napi_id,
		     unsigned int mode);

void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq);
int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx);

static inline bool io_napi(struct io_ring_ctx *ctx)
{
	return !list_empty(&ctx->napi_list);
}

static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
				     struct io_wait_queue *iowq)
{
	if (!io_napi(ctx))
		return;
	__io_napi_busy_loop(ctx, iowq);
}

/*
 * io_napi_add() - Add napi id to the busy poll list
 * @req: pointer to io_kiocb request
 *
 * Add the napi id of the socket to the napi busy poll list and hash table.
 */
static inline void io_napi_add(struct io_kiocb *req)
{
	struct io_ring_ctx *ctx = req->ctx;
	struct socket *sock;
	unsigned int mode = IO_URING_NAPI_TRACKING_DYNAMIC;

	if (READ_ONCE(ctx->napi_track_mode) != mode)
		return;

	sock = sock_from_file(req->file);
	if (sock && sock->sk)
		__io_napi_add_id(ctx, READ_ONCE(sock->sk->sk_napi_id), mode);
}

#else

static inline void io_napi_init(struct io_ring_ctx *ctx)
{
}
static inline void io_napi_free(struct io_ring_ctx *ctx)
{
}
static inline int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
{
	return -EOPNOTSUPP;
}
static inline int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
{
	return -EOPNOTSUPP;
}
static inline bool io_napi(struct io_ring_ctx *ctx)
{
	return false;
}
static inline void io_napi_add(struct io_kiocb *req)
{
}
static inline void io_napi_busy_loop(struct io_ring_ctx *ctx,
				     struct io_wait_queue *iowq)
{
}
static inline int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx)
{
	return 0;
}
#endif /* CONFIG_NET_RX_BUSY_POLL */

#endif

Annotation

Implementation Notes