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/* $OpenBSD: virtio.h,v 1.6 2016/10/12 06:56:54 mlarkin Exp $ */
/*
* Copyright (c) 2015 Mike Larkin <mlarkin@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <dev/pci/virtioreg.h>
#define VIRTQUEUE_ALIGN(n) (((n)+(VIRTIO_PAGE_SIZE-1))& \
~(VIRTIO_PAGE_SIZE-1))
/* Queue sizes must be power of two */
#define VIORND_QUEUE_SIZE 64
#define VIORND_QUEUE_MASK (VIORND_QUEUE_SIZE - 1)
#define VIOBLK_QUEUE_SIZE 64
#define VIOBLK_QUEUE_MASK (VIOBLK_QUEUE_SIZE - 1)
#define VIONET_QUEUE_SIZE 64
#define VIONET_QUEUE_MASK (VIONET_QUEUE_SIZE - 1)
/* All the devices we support have either 1 or 2 queues */
#define VIRTIO_MAX_QUEUES 2
/*
* This struct stores notifications from a virtio driver. There is
* one such struct per virtio device.
*/
struct virtio_io_cfg {
uint32_t device_feature;
uint32_t guest_feature;
uint32_t queue_address;
uint16_t queue_size;
uint16_t queue_select;
uint16_t queue_notify;
uint8_t device_status;
uint8_t isr_status;
};
/*
* A virtio device can have several virtqs. For example, vionet has one virtq
* each for transmitting and receiving packets. This struct describes the state
* of one virtq, such as their address in memory, size, offsets of rings, etc.
* There is one virtio_vq_info per virtq.
*/
struct virtio_vq_info {
/* Guest physical address of virtq */
uint32_t qa;
/* Queue size: number of queue entries in virtq */
uint32_t qs;
/*
* The offset of the 'available' ring within the virtq located at
* guest physical address qa above
*/
uint32_t vq_availoffset;
/*
* The offset of the 'used' ring within the virtq located at guest
* physical address qa above
*/
uint32_t vq_usedoffset;
/*
* The index into a slot of the 'available' ring that a virtio device
* can consume next
*/
uint16_t last_avail;
/*
* The most recent index into the 'available' ring that a virtio
* driver notified to the host.
*/
uint16_t notified_avail;
};
struct viornd_dev {
struct virtio_io_cfg cfg;
struct virtio_vq_info vq[VIRTIO_MAX_QUEUES];
};
struct vioblk_dev {
struct virtio_io_cfg cfg;
struct virtio_vq_info vq[VIRTIO_MAX_QUEUES];
int fd;
uint64_t sz;
};
struct vionet_dev {
pthread_mutex_t mutex;
struct event event;
struct virtio_io_cfg cfg;
struct virtio_vq_info vq[VIRTIO_MAX_QUEUES];
int fd, rx_added;
int rx_pending;
uint32_t vm_id;
int irq;
uint8_t mac[6];
};
struct virtio_net_hdr {
uint8_t flags;
uint8_t gso_type;
uint16_t hdr_len;
uint16_t gso_size;
uint16_t csum_start;
uint16_t csum_offset;
/*
* num_buffers is only used if VIRTIO_NET_F_MRG_RXBUF is negotiated.
* vmd(8) doesn't negotiate that, but the field is listed here
* for completeness sake.
*/
/* uint16_t num_buffers; */
};
void virtio_init(struct vm_create_params *, int *, int *);
uint32_t vring_size(uint32_t);
int virtio_rnd_io(int, uint16_t, uint32_t *, uint8_t *, void *);
void viornd_update_qs(void);
void viornd_update_qa(void);
int viornd_notifyq(void);
int virtio_blk_io(int, uint16_t, uint32_t *, uint8_t *, void *);
void vioblk_update_qs(struct vioblk_dev *);
void vioblk_update_qa(struct vioblk_dev *);
int vioblk_notifyq(struct vioblk_dev *);
int virtio_net_io(int, uint16_t, uint32_t *, uint8_t *, void *);
void vionet_update_qs(struct vionet_dev *);
void vionet_update_qa(struct vionet_dev *);
int vionet_notifyq(struct vionet_dev *);
void vionet_notify_rx(struct vionet_dev *);
void vionet_process_rx(uint32_t);
int vionet_enq_rx(struct vionet_dev *, char *, ssize_t, int *);
const char *vioblk_cmd_name(uint32_t);
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