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From: Stefan Roesch <[email protected]>
To: [email protected], [email protected]
Cc: [email protected], [email protected], [email protected],
	Jakub Kicinski <[email protected]>
Subject: [PATCH v8 7/7] io_uring: add api to set / get napi configuration.
Date: Thu,  9 Feb 2023 15:01:44 -0800	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This adds an api to register and unregister the napi prefer busy poll
setting from liburing. To be able to use this functionality, the
corresponding liburing patch is needed.

Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
---
 include/uapi/linux/io_uring.h | 3 ++-
 io_uring/napi.c               | 6 +++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index fe25ae92744d..e14f31a4b10c 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -647,7 +647,8 @@ struct io_uring_buf_reg {
 /* argument for IORING_(UN)REGISTER_NAPI */
 struct io_uring_napi {
 	__u32	busy_poll_to;
-	__u32	pad;
+	__u8	prefer_busy_poll;
+	__u8	pad[3];
 	__u64	resv;
 };
 
diff --git a/io_uring/napi.c b/io_uring/napi.c
index 34513b284234..a1605bef2bbc 100644
--- a/io_uring/napi.c
+++ b/io_uring/napi.c
@@ -203,15 +203,17 @@ int io_register_napi(struct io_ring_ctx *ctx, void __user *arg)
 {
 	const struct io_uring_napi curr = {
 		.busy_poll_to = ctx->napi_busy_poll_to,
+		.prefer_busy_poll = ctx->napi_prefer_busy_poll
 	};
 	struct io_uring_napi napi;
 
 	if (copy_from_user(&napi, arg, sizeof(napi)))
 		return -EFAULT;
-	if (napi.pad || napi.resv)
+	if (napi.pad[0] || napi.pad[1] || napi.pad[2] || napi.resv)
 		return -EINVAL;
 
 	WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to);
+	WRITE_ONCE(ctx->napi_prefer_busy_poll, !!napi.prefer_busy_poll);
 
 	if (copy_to_user(arg, &curr, sizeof(curr)))
 		return -EFAULT;
@@ -223,6 +225,7 @@ int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
 {
 	const struct io_uring_napi curr = {
 		.busy_poll_to = ctx->napi_busy_poll_to,
+		.prefer_busy_poll = ctx->napi_prefer_busy_poll
 	};
 
 	if (arg) {
@@ -231,6 +234,7 @@ int io_unregister_napi(struct io_ring_ctx *ctx, void __user *arg)
 	}
 
 	WRITE_ONCE(ctx->napi_busy_poll_to, 0);
+	WRITE_ONCE(ctx->napi_prefer_busy_poll, false);
 	return 0;
 }
 
-- 
2.30.2


  parent reply	other threads:[~2023-02-09 23:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-09 23:01 [PATCH v8 0/7] io_uring: add napi busy polling support Stefan Roesch
2023-02-09 23:01 ` [PATCH v8 1/7] io-uring: move io_wait_queue definition to header file Stefan Roesch
2023-02-09 23:01 ` [PATCH v8 2/7] io-uring: add napi fields to io_ring_ctx Stefan Roesch
2023-02-09 23:01 ` [PATCH v8 3/7] io-uring: add busy poll timeout, prefer busy poll to io_wait_queue Stefan Roesch
2023-02-09 23:01 ` [PATCH v8 4/7] io-uring: add napi busy poll support Stefan Roesch
2023-02-10  0:00   ` Jens Axboe
2023-02-15 17:22     ` Stefan Roesch
2023-02-09 23:01 ` [PATCH v8 5/7] io-uring: add sqpoll support for napi busy poll Stefan Roesch
2023-02-10  0:14   ` Jens Axboe
2023-02-09 23:01 ` [PATCH v8 6/7] io_uring: add api to set / get napi configuration Stefan Roesch
2023-02-10  0:02   ` Jens Axboe
2023-02-09 23:01 ` Stefan Roesch [this message]
2023-02-10  0:02   ` [PATCH v8 7/7] " Jens Axboe

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