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io-uring: add sqpoll support for napi busy poll

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This adds the sqpoll support to the io-uring napi.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
Suggested-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/20230608163839.2891748-6-shr@devkernel.io
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Roesch 2023-06-08 09:38:37 -07:00 committed by Jens Axboe
parent 8d0c12a80c
commit ff183d427d
3 changed files with 33 additions and 1 deletions
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24
io_uring/napi.c
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@ -252,4 +252,28 @@ void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq)
io_napi_blocking_busy_loop(ctx, iowq);
}
/*
* io_napi_sqpoll_busy_poll() - busy poll loop for sqpoll
* @ctx: pointer to io-uring context structure
*
* Splice of the napi list and execute the napi busy poll loop.
*/
int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx)
{
LIST_HEAD(napi_list);
bool is_stale = false;
if (!READ_ONCE(ctx->napi_busy_poll_to))
return 0;
if (list_empty_careful(&ctx->napi_list))
return 0;
rcu_read_lock();
is_stale = __io_napi_do_busy_loop(ctx, NULL);
rcu_read_unlock();
io_napi_remove_stale(ctx, is_stale);
return 1;
}
#endif

6
io_uring/napi.h
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@ -17,6 +17,7 @@ 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, struct timespec64 *ts);
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)
{
@ -83,7 +84,10 @@ 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

4
io_uring/sqpoll.c
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@ -15,6 +15,7 @@
#include <uapi/linux/io_uring.h>
#include "io_uring.h"
#include "napi.h"
#include "sqpoll.h"
#define IORING_SQPOLL_CAP_ENTRIES_VALUE 8
@ -194,6 +195,9 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
ret = io_submit_sqes(ctx, to_submit);
mutex_unlock(&ctx->uring_lock);
if (io_napi(ctx))
ret += io_napi_sqpoll_busy_poll(ctx);
if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait))
wake_up(&ctx->sqo_sq_wait);
if (creds)