netdev - [RFC PATCH v3 2/3] io_uring: add api to set napi busy poll timeout.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221115070900.1788837-3-shr@devkernel.io>
Date:   Mon, 14 Nov 2022 23:08:59 -0800
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 v3 2/3] io_uring: add api to set napi busy poll timeout.

This adds an api to register 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 |  3 +++
 io_uring/io_uring.c           | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 2df3225b562f..9b5c1df0d1d8 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -490,6 +490,9 @@ 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	= 27,
+
 	/* this goes last */
 	IORING_REGISTER_LAST
 };
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 4f432694cbed..f6c9c9cbe0f8 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -4122,6 +4122,16 @@ 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)
+{
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	WRITE_ONCE(ctx->napi_busy_poll_to, to);
+	return 0;
+#else
+	return -EINVAL;
+#endif
+}
+
 static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 			       void __user *arg, unsigned nr_args)
 	__releases(ctx->uring_lock)
@@ -4282,6 +4292,12 @@ 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;
 	default:
 		ret = -EINVAL;
 		break;
-- 
2.30.2