[RFC] Revert "vhost: use imported VDUSE uAPI header"

[Stephen Hemminger <stephen@networkplumber.org>]

The file vduse.h does not have a license that is compatiable
with current DPDK license policy.

This reverts commit 9fec3f0569087de06666129c7f2badaf5be2776e.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 kernel/linux/uapi/linux/vduse.h | 353 --------------------------------
 lib/vhost/meson.build           |   5 +-
 lib/vhost/vduse.c               |   2 +-
 lib/vhost/vduse.h               |  22 ++
 4 files changed, 27 insertions(+), 355 deletions(-)
 delete mode 100644 kernel/linux/uapi/linux/vduse.h

diff --git a/kernel/linux/uapi/linux/vduse.h b/kernel/linux/uapi/linux/vduse.h
deleted file mode 100644
index 11bd48c72c..0000000000
--- a/kernel/linux/uapi/linux/vduse.h
+++ /dev/null
@@ -1,353 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
-#ifndef _UAPI_VDUSE_H_
-#define _UAPI_VDUSE_H_
-
-#include <linux/types.h>
-
-#define VDUSE_BASE	0x81
-
-/* The ioctls for control device (/dev/vduse/control) */
-
-#define VDUSE_API_VERSION	0
-
-/*
- * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
- * This is used for future extension.
- */
-#define VDUSE_GET_API_VERSION	_IOR(VDUSE_BASE, 0x00, __u64)
-
-/* Set the version of VDUSE API that userspace supported. */
-#define VDUSE_SET_API_VERSION	_IOW(VDUSE_BASE, 0x01, __u64)
-
-/**
- * struct vduse_dev_config - basic configuration of a VDUSE device
- * @name: VDUSE device name, needs to be NUL terminated
- * @vendor_id: virtio vendor id
- * @device_id: virtio device id
- * @features: virtio features
- * @vq_num: the number of virtqueues
- * @vq_align: the allocation alignment of virtqueue's metadata
- * @reserved: for future use, needs to be initialized to zero
- * @config_size: the size of the configuration space
- * @config: the buffer of the configuration space
- *
- * Structure used by VDUSE_CREATE_DEV ioctl to create VDUSE device.
- */
-struct vduse_dev_config {
-#define VDUSE_NAME_MAX	256
-	char name[VDUSE_NAME_MAX];
-	__u32 vendor_id;
-	__u32 device_id;
-	__u64 features;
-	__u32 vq_num;
-	__u32 vq_align;
-	__u32 reserved[13];
-	__u32 config_size;
-	__u8 config[];
-};
-
-/* Create a VDUSE device which is represented by a char device (/dev/vduse/$NAME) */
-#define VDUSE_CREATE_DEV	_IOW(VDUSE_BASE, 0x02, struct vduse_dev_config)
-
-/*
- * Destroy a VDUSE device. Make sure there are no more references
- * to the char device (/dev/vduse/$NAME).
- */
-#define VDUSE_DESTROY_DEV	_IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX])
-
-/* The ioctls for VDUSE device (/dev/vduse/$NAME) */
-
-/**
- * struct vduse_iotlb_entry - entry of IOTLB to describe one IOVA region [start, last]
- * @offset: the mmap offset on returned file descriptor
- * @start: start of the IOVA region
- * @last: last of the IOVA region
- * @perm: access permission of the IOVA region
- *
- * Structure used by VDUSE_IOTLB_GET_FD ioctl to find an overlapped IOVA region.
- */
-struct vduse_iotlb_entry {
-	__u64 offset;
-	__u64 start;
-	__u64 last;
-#define VDUSE_ACCESS_RO 0x1
-#define VDUSE_ACCESS_WO 0x2
-#define VDUSE_ACCESS_RW 0x3
-	__u8 perm;
-};
-
-/*
- * Find the first IOVA region that overlaps with the range [start, last]
- * and return the corresponding file descriptor. Return -EINVAL means the
- * IOVA region doesn't exist. Caller should set start and last fields.
- */
-#define VDUSE_IOTLB_GET_FD	_IOWR(VDUSE_BASE, 0x10, struct vduse_iotlb_entry)
-
-/*
- * Get the negotiated virtio features. It's a subset of the features in
- * struct vduse_dev_config which can be accepted by virtio driver. It's
- * only valid after FEATURES_OK status bit is set.
- */
-#define VDUSE_DEV_GET_FEATURES	_IOR(VDUSE_BASE, 0x11, __u64)
-
-/**
- * struct vduse_config_data - data used to update configuration space
- * @offset: the offset from the beginning of configuration space
- * @length: the length to write to configuration space
- * @buffer: the buffer used to write from
- *
- * Structure used by VDUSE_DEV_SET_CONFIG ioctl to update device
- * configuration space.
- */
-struct vduse_config_data {
-	__u32 offset;
-	__u32 length;
-	__u8 buffer[];
-};
-
-/* Set device configuration space */
-#define VDUSE_DEV_SET_CONFIG	_IOW(VDUSE_BASE, 0x12, struct vduse_config_data)
-
-/*
- * Inject a config interrupt. It's usually used to notify virtio driver
- * that device configuration space has changed.
- */
-#define VDUSE_DEV_INJECT_CONFIG_IRQ	_IO(VDUSE_BASE, 0x13)
-
-/**
- * struct vduse_vq_config - basic configuration of a virtqueue
- * @index: virtqueue index
- * @max_size: the max size of virtqueue
- * @reserved: for future use, needs to be initialized to zero
- *
- * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue.
- */
-struct vduse_vq_config {
-	__u32 index;
-	__u16 max_size;
-	__u16 reserved[13];
-};
-
-/*
- * Setup the specified virtqueue. Make sure all virtqueues have been
- * configured before the device is attached to vDPA bus.
- */
-#define VDUSE_VQ_SETUP		_IOW(VDUSE_BASE, 0x14, struct vduse_vq_config)
-
-/**
- * struct vduse_vq_state_split - split virtqueue state
- * @avail_index: available index
- */
-struct vduse_vq_state_split {
-	__u16 avail_index;
-};
-
-/**
- * struct vduse_vq_state_packed - packed virtqueue state
- * @last_avail_counter: last driver ring wrap counter observed by device
- * @last_avail_idx: device available index
- * @last_used_counter: device ring wrap counter
- * @last_used_idx: used index
- */
-struct vduse_vq_state_packed {
-	__u16 last_avail_counter;
-	__u16 last_avail_idx;
-	__u16 last_used_counter;
-	__u16 last_used_idx;
-};
-
-/**
- * struct vduse_vq_info - information of a virtqueue
- * @index: virtqueue index
- * @num: the size of virtqueue
- * @desc_addr: address of desc area
- * @driver_addr: address of driver area
- * @device_addr: address of device area
- * @split: split virtqueue state
- * @packed: packed virtqueue state
- * @ready: ready status of virtqueue
- *
- * Structure used by VDUSE_VQ_GET_INFO ioctl to get virtqueue's information.
- */
-struct vduse_vq_info {
-	__u32 index;
-	__u32 num;
-	__u64 desc_addr;
-	__u64 driver_addr;
-	__u64 device_addr;
-	union {
-		struct vduse_vq_state_split split;
-		struct vduse_vq_state_packed packed;
-	};
-	__u8 ready;
-};
-
-/* Get the specified virtqueue's information. Caller should set index field. */
-#define VDUSE_VQ_GET_INFO	_IOWR(VDUSE_BASE, 0x15, struct vduse_vq_info)
-
-/**
- * struct vduse_vq_eventfd - eventfd configuration for a virtqueue
- * @index: virtqueue index
- * @fd: eventfd, -1 means de-assigning the eventfd
- *
- * Structure used by VDUSE_VQ_SETUP_KICKFD ioctl to setup kick eventfd.
- */
-struct vduse_vq_eventfd {
-	__u32 index;
-#define VDUSE_EVENTFD_DEASSIGN -1
-	int fd;
-};
-
-/*
- * Setup kick eventfd for specified virtqueue. The kick eventfd is used
- * by VDUSE kernel module to notify userspace to consume the avail vring.
- */
-#define VDUSE_VQ_SETUP_KICKFD	_IOW(VDUSE_BASE, 0x16, struct vduse_vq_eventfd)
-
-/*
- * Inject an interrupt for specific virtqueue. It's used to notify virtio driver
- * to consume the used vring.
- */
-#define VDUSE_VQ_INJECT_IRQ	_IOW(VDUSE_BASE, 0x17, __u32)
-
-/**
- * struct vduse_iova_umem - userspace memory configuration for one IOVA region
- * @uaddr: start address of userspace memory, it must be aligned to page size
- * @iova: start of the IOVA region
- * @size: size of the IOVA region
- * @reserved: for future use, needs to be initialized to zero
- *
- * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM
- * ioctls to register/de-register userspace memory for IOVA regions
- */
-struct vduse_iova_umem {
-	__u64 uaddr;
-	__u64 iova;
-	__u64 size;
-	__u64 reserved[3];
-};
-
-/* Register userspace memory for IOVA regions */
-#define VDUSE_IOTLB_REG_UMEM	_IOW(VDUSE_BASE, 0x18, struct vduse_iova_umem)
-
-/* De-register the userspace memory. Caller should set iova and size field. */
-#define VDUSE_IOTLB_DEREG_UMEM	_IOW(VDUSE_BASE, 0x19, struct vduse_iova_umem)
-
-/**
- * struct vduse_iova_info - information of one IOVA region
- * @start: start of the IOVA region
- * @last: last of the IOVA region
- * @capability: capability of the IOVA regsion
- * @reserved: for future use, needs to be initialized to zero
- *
- * Structure used by VDUSE_IOTLB_GET_INFO ioctl to get information of
- * one IOVA region.
- */
-struct vduse_iova_info {
-	__u64 start;
-	__u64 last;
-#define VDUSE_IOVA_CAP_UMEM (1 << 0)
-	__u64 capability;
-	__u64 reserved[3];
-};
-
-/*
- * Find the first IOVA region that overlaps with the range [start, last]
- * and return some information on it. Caller should set start and last fields.
- */
-#define VDUSE_IOTLB_GET_INFO	_IOWR(VDUSE_BASE, 0x1a, struct vduse_iova_info)
-
-/* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */
-
-/**
- * enum vduse_req_type - request type
- * @VDUSE_GET_VQ_STATE: get the state for specified virtqueue from userspace
- * @VDUSE_SET_STATUS: set the device status
- * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
- *                      specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
- */
-enum vduse_req_type {
-	VDUSE_GET_VQ_STATE,
-	VDUSE_SET_STATUS,
-	VDUSE_UPDATE_IOTLB,
-};
-
-/**
- * struct vduse_vq_state - virtqueue state
- * @index: virtqueue index
- * @split: split virtqueue state
- * @packed: packed virtqueue state
- */
-struct vduse_vq_state {
-	__u32 index;
-	union {
-		struct vduse_vq_state_split split;
-		struct vduse_vq_state_packed packed;
-	};
-};
-
-/**
- * struct vduse_dev_status - device status
- * @status: device status
- */
-struct vduse_dev_status {
-	__u8 status;
-};
-
-/**
- * struct vduse_iova_range - IOVA range [start, last]
- * @start: start of the IOVA range
- * @last: last of the IOVA range
- */
-struct vduse_iova_range {
-	__u64 start;
-	__u64 last;
-};
-
-/**
- * struct vduse_dev_request - control request
- * @type: request type
- * @request_id: request id
- * @reserved: for future use
- * @vq_state: virtqueue state, only index field is available
- * @s: device status
- * @iova: IOVA range for updating
- * @padding: padding
- *
- * Structure used by read(2) on /dev/vduse/$NAME.
- */
-struct vduse_dev_request {
-	__u32 type;
-	__u32 request_id;
-	__u32 reserved[4];
-	union {
-		struct vduse_vq_state vq_state;
-		struct vduse_dev_status s;
-		struct vduse_iova_range iova;
-		__u32 padding[32];
-	};
-};
-
-/**
- * struct vduse_dev_response - response to control request
- * @request_id: corresponding request id
- * @result: the result of request
- * @reserved: for future use, needs to be initialized to zero
- * @vq_state: virtqueue state
- * @padding: padding
- *
- * Structure used by write(2) on /dev/vduse/$NAME.
- */
-struct vduse_dev_response {
-	__u32 request_id;
-#define VDUSE_REQ_RESULT_OK	0x00
-#define VDUSE_REQ_RESULT_FAILED	0x01
-	__u32 result;
-	__u32 reserved[4];
-	union {
-		struct vduse_vq_state vq_state;
-		__u32 padding[32];
-	};
-};
-
-#endif /* _UAPI_VDUSE_H_ */
diff --git a/lib/vhost/meson.build b/lib/vhost/meson.build
index 0004f283bb..51bcf17244 100644
--- a/lib/vhost/meson.build
+++ b/lib/vhost/meson.build
@@ -26,13 +26,16 @@ sources = files(
         'iotlb.c',
         'socket.c',
         'vdpa.c',
-        'vduse.c',
         'vhost.c',
         'vhost_crypto.c',
         'vhost_user.c',
         'virtio_net.c',
         'virtio_net_ctrl.c',
 )
+if cc.has_header('linux/vduse.h')
+    sources += files('vduse.c')
+    cflags += '-DVHOST_HAS_VDUSE'
+endif
 headers = files(
         'rte_vdpa.h',
         'rte_vhost.h',
diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index eaf3146b95..8ba58555f9 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -8,7 +8,7 @@
 #include <fcntl.h>
 
 
-#include <uapi/linux/vduse.h>
+#include <linux/vduse.h>
 #include <linux/virtio_net.h>
 
 #include <sys/ioctl.h>
diff --git a/lib/vhost/vduse.h b/lib/vhost/vduse.h
index 47ca97a064..0d8f3f1205 100644
--- a/lib/vhost/vduse.h
+++ b/lib/vhost/vduse.h
@@ -9,7 +9,29 @@
 
 #define VDUSE_NET_SUPPORTED_FEATURES VIRTIO_NET_SUPPORTED_FEATURES
 
+#ifdef VHOST_HAS_VDUSE
+
 int vduse_device_create(const char *path, bool compliant_ol_flags);
 int vduse_device_destroy(const char *path);
 
+#else
+
+static inline int
+vduse_device_create(const char *path, bool compliant_ol_flags)
+{
+	RTE_SET_USED(compliant_ol_flags);
+
+	VHOST_CONFIG_LOG(path, ERR, "VDUSE support disabled at build time");
+	return -1;
+}
+
+static inline int
+vduse_device_destroy(const char *path)
+{
+	VHOST_CONFIG_LOG(path, ERR, "VDUSE support disabled at build time");
+	return -1;
+}
+
+#endif /* VHOST_HAS_VDUSE */
+
 #endif /* _VDUSE_H */
-- 
2.45.2