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From: Pavel Begunkov <[email protected]>
To: [email protected], [email protected],
	[email protected]
Cc: "David S . Miller" <[email protected]>,
	Jakub Kicinski <[email protected]>,
	Jonathan Lemon <[email protected]>,
	Willem de Bruijn <[email protected]>,
	Jens Axboe <[email protected]>, David Ahern <[email protected]>,
	[email protected], Pavel Begunkov <[email protected]>
Subject: [PATCH net-next v3 16/25] io_uring: add notification slot registration
Date: Tue,  5 Jul 2022 16:01:16 +0100	[thread overview]
Message-ID: <21830bd164c444b21f6ba8b672311fb245efe752.1656318994.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Let the userspace to register and unregister notification slots.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 include/uapi/linux/io_uring.h | 17 ++++++++++++++
 io_uring/io_uring.c           |  9 ++++++++
 io_uring/notif.c              | 43 +++++++++++++++++++++++++++++++++++
 io_uring/notif.h              |  3 +++
 4 files changed, 72 insertions(+)

diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h
index 09e7c3b13d2d..9b7ea3e1018f 100644
--- a/include/uapi/linux/io_uring.h
+++ b/include/uapi/linux/io_uring.h
@@ -429,6 +429,10 @@ enum {
 	/* sync cancelation API */
 	IORING_REGISTER_SYNC_CANCEL		= 24,
 
+	/* zerocopy notification API */
+	IORING_REGISTER_NOTIFIERS		= 25,
+	IORING_UNREGISTER_NOTIFIERS		= 26,
+
 	/* this goes last */
 	IORING_REGISTER_LAST
 };
@@ -475,6 +479,19 @@ struct io_uring_rsrc_update2 {
 	__u32 resv2;
 };
 
+struct io_uring_notification_slot {
+	__u64 tag;
+	__u64 resv[3];
+};
+
+struct io_uring_notification_register {
+	__u32 nr_slots;
+	__u32 resv;
+	__u64 resv2;
+	__u64 data;
+	__u64 resv3;
+};
+
 /* Skip updating fd indexes set to this value in the fd table */
 #define IORING_REGISTER_FILES_SKIP	(-2)
 
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 6054e71e6ade..3b885d65e569 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3862,6 +3862,15 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
 			break;
 		ret = io_sync_cancel(ctx, arg);
 		break;
+	case IORING_REGISTER_NOTIFIERS:
+		ret = io_notif_register(ctx, arg, nr_args);
+		break;
+	case IORING_UNREGISTER_NOTIFIERS:
+		ret = -EINVAL;
+		if (arg || nr_args)
+			break;
+		ret = io_notif_unregister(ctx);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/io_uring/notif.c b/io_uring/notif.c
index f795e820de56..2e9329f97d2c 100644
--- a/io_uring/notif.c
+++ b/io_uring/notif.c
@@ -157,5 +157,48 @@ __cold int io_notif_unregister(struct io_ring_ctx *ctx)
 	kvfree(ctx->notif_slots);
 	ctx->notif_slots = NULL;
 	ctx->nr_notif_slots = 0;
+	io_notif_cache_purge(ctx);
+	return 0;
+}
+
+__cold int io_notif_register(struct io_ring_ctx *ctx,
+			     void __user *arg, unsigned int size)
+	__must_hold(&ctx->uring_lock)
+{
+	struct io_uring_notification_slot __user *slots;
+	struct io_uring_notification_slot slot;
+	struct io_uring_notification_register reg;
+	unsigned i;
+
+	if (ctx->nr_notif_slots)
+		return -EBUSY;
+	if (size != sizeof(reg))
+		return -EINVAL;
+	if (copy_from_user(&reg, arg, sizeof(reg)))
+		return -EFAULT;
+	if (!reg.nr_slots || reg.nr_slots > IORING_MAX_NOTIF_SLOTS)
+		return -EINVAL;
+	if (reg.resv || reg.resv2 || reg.resv3)
+		return -EINVAL;
+
+	slots = u64_to_user_ptr(reg.data);
+	ctx->notif_slots = kvcalloc(reg.nr_slots, sizeof(ctx->notif_slots[0]),
+				GFP_KERNEL_ACCOUNT);
+	if (!ctx->notif_slots)
+		return -ENOMEM;
+
+	for (i = 0; i < reg.nr_slots; i++, ctx->nr_notif_slots++) {
+		struct io_notif_slot *notif_slot = &ctx->notif_slots[i];
+
+		if (copy_from_user(&slot, &slots[i], sizeof(slot))) {
+			io_notif_unregister(ctx);
+			return -EFAULT;
+		}
+		if (slot.resv[0] | slot.resv[1] | slot.resv[2]) {
+			io_notif_unregister(ctx);
+			return -EINVAL;
+		}
+		notif_slot->tag = slot.tag;
+	}
 	return 0;
 }
diff --git a/io_uring/notif.h b/io_uring/notif.h
index 23ca7620fff9..6dde39c6afbe 100644
--- a/io_uring/notif.h
+++ b/io_uring/notif.h
@@ -6,6 +6,7 @@
 #include <linux/nospec.h>
 
 #define IO_NOTIF_SPLICE_BATCH	32
+#define IORING_MAX_NOTIF_SLOTS (1U << 10)
 
 struct io_notif {
 	struct ubuf_info	uarg;
@@ -47,6 +48,8 @@ struct io_notif_slot {
 	u32			seq;
 };
 
+int io_notif_register(struct io_ring_ctx *ctx,
+		      void __user *arg, unsigned int size);
 int io_notif_unregister(struct io_ring_ctx *ctx);
 void io_notif_cache_purge(struct io_ring_ctx *ctx);
 
-- 
2.36.1


  parent reply	other threads:[~2022-07-05 15:04 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-05 15:01 [PATCH net-next v3 00/25] io_uring zerocopy send Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 01/25] ipv4: avoid partial copy for zc Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 02/25] ipv6: " Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 03/25] skbuff: add SKBFL_DONT_ORPHAN flag Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 04/25] skbuff: carry external ubuf_info in msghdr Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 05/25] net: bvec specific path in zerocopy_sg_from_iter Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 06/25] net: optimise bvec-based zc page referencing Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 07/25] net: don't track pfmemalloc for managed frags Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 08/25] skbuff: don't mix ubuf_info of different types Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 09/25] ipv4/udp: support zc with managed data Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 10/25] ipv6/udp: " Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 11/25] tcp: " Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 12/25] io_uring: add zc notification infrastructure Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 13/25] io_uring: export task put Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 14/25] io_uring: cache struct io_notif Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 15/25] io_uring: complete notifiers in tw Pavel Begunkov
2022-07-05 15:01 ` Pavel Begunkov [this message]
2022-07-05 15:01 ` [PATCH net-next v3 17/25] io_uring: wire send zc request type Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 18/25] io_uring: account locked pages for non-fixed zc Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 19/25] io_uring: allow to pass addr into sendzc Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 20/25] io_uring: add rsrc referencing for notifiers Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 21/25] io_uring: sendzc with fixed buffers Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 22/25] io_uring: flush notifiers after sendzc Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 23/25] io_uring: rename IORING_OP_FILES_UPDATE Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 24/25] io_uring: add zc notification flush requests Pavel Begunkov
2022-07-05 15:01 ` [PATCH net-next v3 25/25] selftests/io_uring: test zerocopy send Pavel Begunkov
2022-07-05 15:04 ` [PATCH net-next v3 00/25] io_uring " Pavel Begunkov

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