linux-IllusionX/io_uring/napi.h
Olivier Langlois 84f2eecf95 io_uring/napi: check napi_enabled in io_napi_add() before proceeding
doing so avoids the overhead of adding napi ids to all the rings that do
not enable napi.

if no id is added to napi_list because napi is disabled,
__io_napi_busy_loop() will not be called.

Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Fixes: b4ccc4dd13 ("io_uring/napi: enable even with a timeout of 0")
Link: https://lore.kernel.org/r/bd989ccef5fda14f5fd9888faf4fefcf66bd0369.1723400131.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2024-08-12 12:09:03 -06:00

104 lines
2.4 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#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);
void __io_napi_add(struct io_ring_ctx *ctx, struct socket *sock);
void __io_napi_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq, ktime_t to_wait);
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_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t to_wait)
{
if (!io_napi(ctx))
return;
__io_napi_adjust_timeout(ctx, iowq, to_wait);
}
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;
if (!READ_ONCE(ctx->napi_enabled))
return;
sock = sock_from_file(req->file);
if (sock)
__io_napi_add(ctx, sock);
}
#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_adjust_timeout(struct io_ring_ctx *ctx,
struct io_wait_queue *iowq,
ktime_t to_wait)
{
}
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