netdev - [RFC PATCH v1 2/2] io_uring: add api to set napi busy poll timeout.

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Date:   Thu,  3 Nov 2022 13:39:39 -0700
From:   Stefan Roesch <shr@...kernel.io>
To:     kernel-team@...com
Cc:     shr@...kernel.io, axboe@...nel.dk, olivier@...llion01.com,
        netdev@...r.kernel.org, io-uring@...r.kernel.org, kuba@...nel.org
Subject: [RFC PATCH v1 2/2] io_uring: add api to set napi busy poll timeout.

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

Signed-off-by: Stefan Roesch <shr@...kernel.io>
---
 include/uapi/linux/io_uring.h |  4 ++++
 io_uring/io_uring.c           | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index ab7458033ee3..48670074e1fc 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -490,6 +490,10 @@ enum {
 	/* register a range of fixed file slots for automatic slot allocation */
 	IORING_REGISTER_FILE_ALLOC_RANGE	= 25,
 
+	/* set/clear busy poll timeout */
+	IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT	= 26,
+	IORING_UNREGISTER_NAPI_BUSY_POLL_TIMEOUT= 27,
+
 	/* this goes last */
 	IORING_REGISTER_LAST
 };
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index f64ccd537d05..c3d277772ca0 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4108,6 +4108,12 @@ static __cold int io_register_iowq_max_workers(struct io_ring_ctx *ctx,
 	return ret;
 }
 
+static int io_register_napi_busy_poll_timeout(struct io_ring_ctx *ctx, unsigned int to)
+{
+	WRITE_ONCE(ctx->napi_busy_poll_to, to);
+	return 0;
+}
+
 static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 			       void __user *arg, unsigned nr_args)
 	__releases(ctx->uring_lock)
@@ -4268,6 +4274,18 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 			break;
 		ret = io_register_file_alloc_range(ctx, arg);
 		break;
+	case IORING_REGISTER_NAPI_BUSY_POLL_TIMEOUT:
+		ret = -EINVAL;
+		if (arg || !nr_args)
+			break;
+		ret = io_register_napi_busy_poll_timeout(ctx, nr_args);
+		break;
+	case IORING_UNREGISTER_NAPI_BUSY_POLL_TIMEOUT:
+		ret = -EINVAL;
+		if (arg || nr_args)
+			break;
+		ret = io_register_napi_busy_poll_timeout(ctx, nr_args);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
-- 
2.30.2