[net-next-2.6.git] / include / linux / vhost.h

#ifndef _LINUX_VHOST_H
#define _LINUX_VHOST_H
/* Userspace interface for in-kernel virtio accelerators. */

/* vhost is used to reduce the number of system calls involved in virtio.
 *
 * Existing virtio net code is used in the guest without modification.
 *
 * This header includes interface used by userspace hypervisor for
 * device configuration.
 */

#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/ioctl.h>
#include <linux/virtio_config.h>
#include <linux/virtio_ring.h>

struct vhost_vring_state {
	unsigned int index;
	unsigned int num;
};

struct vhost_vring_file {
	unsigned int index;
	int fd; /* Pass -1 to unbind from file. */

};

struct vhost_vring_addr {
	unsigned int index;
	/* Option flags. */
	unsigned int flags;
	/* Flag values: */
	/* Whether log address is valid. If set enables logging. */
#define VHOST_VRING_F_LOG 0

	/* Start of array of descriptors (virtually contiguous) */
	__u64 desc_user_addr;
	/* Used structure address. Must be 32 bit aligned */
	__u64 used_user_addr;
	/* Available structure address. Must be 16 bit aligned */
	__u64 avail_user_addr;
	/* Logging support. */
	/* Log writes to used structure, at offset calculated from specified
	 * address. Address must be 32 bit aligned. */
	__u64 log_guest_addr;
};

struct vhost_memory_region {
	__u64 guest_phys_addr;
	__u64 memory_size; /* bytes */
	__u64 userspace_addr;
	__u64 flags_padding; /* No flags are currently specified. */
};

/* All region addresses and sizes must be 4K aligned. */
#define VHOST_PAGE_SIZE 0x1000

struct vhost_memory {
	__u32 nregions;
	__u32 padding;
	struct vhost_memory_region regions[0];
};

/* ioctls */

#define VHOST_VIRTIO 0xAF

/* Features bitmask for forward compatibility.  Transport bits are used for
 * vhost specific features. */
#define VHOST_GET_FEATURES	_IOR(VHOST_VIRTIO, 0x00, __u64)
#define VHOST_SET_FEATURES	_IOW(VHOST_VIRTIO, 0x00, __u64)

/* Set current process as the (exclusive) owner of this file descriptor.  This
 * must be called before any other vhost command.  Further calls to
 * VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */
#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
/* Give up ownership, and reset the device to default values.
 * Allows subsequent call to VHOST_OWNER_SET to succeed. */
#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)

/* Set up/modify memory layout */
#define VHOST_SET_MEM_TABLE	_IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)

/* Write logging setup. */
/* Memory writes can optionally be logged by setting bit at an offset
 * (calculated from the physical address) from specified log base.
 * The bit is set using an atomic 32 bit operation. */
/* Set base address for logging. */
#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
/* Specify an eventfd file descriptor to signal on log write. */
#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)

/* Ring setup. */
/* Set number of descriptors in ring. This parameter can not
 * be modified while ring is running (bound to a device). */
#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
/* Set addresses for the ring. */
#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
/* Base value where queue looks for available descriptors */
#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
/* Get accessor: reads index, writes value in num */
#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)

/* The following ioctls use eventfd file descriptors to signal and poll
 * for events. */

/* Set eventfd to poll for added buffers */
#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
/* Set eventfd to signal when buffers have beed used */
#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
/* Set eventfd to signal an error */
#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)

/* VHOST_NET specific defines */

/* Attach virtio net ring to a raw socket, or tap device.
 * The socket must be already bound to an ethernet device, this device will be
 * used for transmit.  Pass fd -1 to unbind from the socket and the transmit
 * device.  This can be used to stop the ring (e.g. for migration). */
#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)

/* Feature bits */
/* Log all write descriptors. Can be changed while device is active. */
#define VHOST_F_LOG_ALL 26
/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
#define VHOST_NET_F_VIRTIO_NET_HDR 27

#endif
Commit	Line	Data
3a4d5c94 MT	1	#ifndef _LINUX_VHOST_H
	2	#define _LINUX_VHOST_H
	3	/* Userspace interface for in-kernel virtio accelerators. */
	4
	5	/* vhost is used to reduce the number of system calls involved in virtio.
	6	*
	7	* Existing virtio net code is used in the guest without modification.
	8	*
	9	* This header includes interface used by userspace hypervisor for
	10	* device configuration.
	11	*/
	12
	13	#include <linux/types.h>
	14	#include <linux/compiler.h>
	15	#include <linux/ioctl.h>
	16	#include <linux/virtio_config.h>
	17	#include <linux/virtio_ring.h>
	18
	19	struct vhost_vring_state {
	20	unsigned int index;
	21	unsigned int num;
	22	};
	23
	24	struct vhost_vring_file {
	25	unsigned int index;
	26	int fd; /* Pass -1 to unbind from file. */
	27
	28	};
	29
	30	struct vhost_vring_addr {
	31	unsigned int index;
	32	/* Option flags. */
	33	unsigned int flags;
	34	/* Flag values: */
	35	/* Whether log address is valid. If set enables logging. */
	36	#define VHOST_VRING_F_LOG 0
	37
	38	/* Start of array of descriptors (virtually contiguous) */
	39	__u64 desc_user_addr;
	40	/* Used structure address. Must be 32 bit aligned */
	41	__u64 used_user_addr;
	42	/* Available structure address. Must be 16 bit aligned */
	43	__u64 avail_user_addr;
	44	/* Logging support. */
	45	/* Log writes to used structure, at offset calculated from specified
	46	* address. Address must be 32 bit aligned. */
	47	__u64 log_guest_addr;
	48	};
	49
	50	struct vhost_memory_region {
	51	__u64 guest_phys_addr;
	52	__u64 memory_size; /* bytes */
	53	__u64 userspace_addr;
	54	__u64 flags_padding; /* No flags are currently specified. */
	55	};
	56
	57	/* All region addresses and sizes must be 4K aligned. */
	58	#define VHOST_PAGE_SIZE 0x1000
	59
	60	struct vhost_memory {
	61	__u32 nregions;
	62	__u32 padding;
	63	struct vhost_memory_region regions[0];
	64	};
65
66	/* ioctls */
67
68	#define VHOST_VIRTIO 0xAF
69
70	/* Features bitmask for forward compatibility. Transport bits are used for
71	* vhost specific features. */
72	#define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
73	#define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
74
75	/* Set current process as the (exclusive) owner of this file descriptor. This
76	* must be called before any other vhost command. Further calls to
77	* VHOST_OWNER_SET fail until VHOST_OWNER_RESET is called. */
78	#define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
79	/* Give up ownership, and reset the device to default values.
80	* Allows subsequent call to VHOST_OWNER_SET to succeed. */
81	#define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
82
83	/* Set up/modify memory layout */
84	#define VHOST_SET_MEM_TABLE _IOW(VHOST_VIRTIO, 0x03, struct vhost_memory)
85
86	/* Write logging setup. */
87	/* Memory writes can optionally be logged by setting bit at an offset
88	* (calculated from the physical address) from specified log base.
89	* The bit is set using an atomic 32 bit operation. */
90	/* Set base address for logging. */
91	#define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
92	/* Specify an eventfd file descriptor to signal on log write. */
93	#define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
94
95	/* Ring setup. */
96	/* Set number of descriptors in ring. This parameter can not
97	* be modified while ring is running (bound to a device). */
98	#define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
99	/* Set addresses for the ring. */
100	#define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
101	/* Base value where queue looks for available descriptors */
102	#define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
103	/* Get accessor: reads index, writes value in num */
104	#define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
105
106	/* The following ioctls use eventfd file descriptors to signal and poll
107	* for events. */
108
109	/* Set eventfd to poll for added buffers */
110	#define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
111	/* Set eventfd to signal when buffers have beed used */
112	#define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
113	/* Set eventfd to signal an error */
114	#define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
115
116	/* VHOST_NET specific defines */
117
118	/* Attach virtio net ring to a raw socket, or tap device.
119	* The socket must be already bound to an ethernet device, this device will be
120	* used for transmit. Pass fd -1 to unbind from the socket and the transmit
121	* device. This can be used to stop the ring (e.g. for migration). */
122	#define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
123
124	/* Feature bits */
125	/* Log all write descriptors. Can be changed while device is active. */
126	#define VHOST_F_LOG_ALL 26
127	/* vhost-net should add virtio_net_hdr for RX, and strip for TX packets. */
128	#define VHOST_NET_F_VIRTIO_NET_HDR 27
129
130	#endif