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From: Stefan Roesch <[email protected]>
To: [email protected], [email protected]
Cc: [email protected], [email protected], [email protected],
	[email protected], [email protected], [email protected]
Subject: [PATCH v14 7/8] io_uring: add register/unregister napi function
Date: Mon,  5 Jun 2023 14:20:08 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This adds an api to register and unregister the napi for io-uring. If
the arg value is specified when unregistering, the current napi setting
for the busy poll timeout is copied into the user structure. If this is
not required, NULL can be passed as the arg value.

Signed-off-by: Stefan Roesch <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
---
 include/uapi/linux/io_uring.h | 11 ++++++++
 io_uring/io_uring.c           | 12 +++++++++
 io_uring/napi.c               | 48 +++++++++++++++++++++++++++++++++++
 io_uring/napi.h               | 11 ++++++++
 4 files changed, 82 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 0716cb17e436..278c1a9de78c 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -523,6 +523,10 @@ enum {
 	/* register a range of fixed file slots for automatic slot allocation */
 	IORING_REGISTER_FILE_ALLOC_RANGE	= 25,
 
+	/* set/clear busy poll settings */
+	IORING_REGISTER_NAPI			= 26,
+	IORING_UNREGISTER_NAPI			= 27,
+
 	/* this goes last */
 	IORING_REGISTER_LAST,
 
@@ -649,6 +653,13 @@ struct io_uring_buf_reg {
 	__u64	resv[3];
 };
 
+/* argument for IORING_(UN)REGISTER_NAPI */
+struct io_uring_napi {
+	__u32	busy_poll_to;
+	__u32	pad;
+	__u64	resv;
+};
+
 /*
  * io_uring_restriction->opcode values
  */
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index f06175b36b41..6162c86d9291 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4405,6 +4405,18 @@ 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:
+		ret = -EINVAL;
+		if (!arg || nr_args != 1)
+			break;
+		ret = io_register_napi(ctx, arg);
+		break;
+	case IORING_UNREGISTER_NAPI:
+		ret = -EINVAL;
+		if (nr_args != 1)
+			break;
+		ret = io_unregister_napi(ctx, arg);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/io_uring/napi.c b/io_uring/napi.c
index 3e578df36cc5..b1a3ed9d1c2e 100644
--- a/io_uring/napi.c
+++ b/io_uring/napi.c
@@ -207,6 +207,54 @@ void io_napi_free(struct io_ring_ctx *ctx)
 	spin_unlock(&ctx->napi_lock);
 }
 
+/*
+ * io_napi_register() - Register napi with io-uring
+ * @ctx: pointer to io-uring context structure
+ * @arg: pointer to io_uring_napi structure
+ *
+ * Register napi in the io-uring context.
+ */
+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,
+	};
+	struct io_uring_napi napi;
+
+	if (copy_from_user(&napi, arg, sizeof(napi)))
+		return -EFAULT;
+	if (napi.pad || napi.resv)
+		return -EINVAL;
+
+	WRITE_ONCE(ctx->napi_busy_poll_to, napi.busy_poll_to);
+
+	if (copy_to_user(arg, &curr, sizeof(curr)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+ * io_napi_unregister() - Unregister napi with io-uring
+ * @ctx: pointer to io-uring context structure
+ * @arg: pointer to io_uring_napi structure
+ *
+ * Unregister napi. If arg has been specified copy the busy poll timeout and
+ * prefer busy poll setting to the passed in structure.
+ */
+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,
+	};
+
+	if (arg && copy_to_user(arg, &curr, sizeof(curr)))
+		return -EFAULT;
+
+	WRITE_ONCE(ctx->napi_busy_poll_to, 0);
+	return 0;
+}
+
 /*
  * __io_napi_adjust_timeout() - Add napi id to the busy poll list
  * @ctx: pointer to io-uring context structure
diff --git a/io_uring/napi.h b/io_uring/napi.h
index b6d6243fc7fe..6fc0393d0dbe 100644
--- a/io_uring/napi.h
+++ b/io_uring/napi.h
@@ -12,6 +12,9 @@
 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,
@@ -68,6 +71,14 @@ 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;
-- 
2.39.1


  parent reply	other threads:[~2023-06-05 21:20 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-05 21:20 [PATCH v14 0/8] io_uring: add napi busy polling support Stefan Roesch
2023-06-05 21:20 ` [PATCH v14 1/8] net: split off __napi_busy_poll from napi_busy_poll Stefan Roesch
2023-06-05 21:20 ` [PATCH v14 2/8] net: introduce napi_busy_loop_rcu() Stefan Roesch
2023-06-06 10:10   ` Simon Horman
2023-06-05 21:20 ` [PATCH v14 3/8] net: split off _napi_busy_loop() Stefan Roesch
2023-06-05 22:21   ` Jakub Kicinski
2023-06-05 21:20 ` [PATCH v14 4/8] io-uring: move io_wait_queue definition to header file Stefan Roesch
2023-06-05 21:20 ` [PATCH v14 5/8] io-uring: add napi busy poll support Stefan Roesch
2023-06-05 21:20 ` [PATCH v14 6/8] io-uring: add sqpoll support for napi busy poll Stefan Roesch
2023-06-05 21:20 ` Stefan Roesch [this message]
2023-06-05 21:20 ` [PATCH v14 8/8] io_uring: add prefer busy poll to register and unregister napi api Stefan Roesch

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