162 lines
4.7 KiB
C
162 lines
4.7 KiB
C
#ifndef _VHOST_H
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#define _VHOST_H
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#include <linux/eventfd.h>
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#include <linux/vhost.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.h>
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#include <linux/poll.h>
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#include <linux/file.h>
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#include <linux/skbuff.h>
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#include <linux/uio.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_ring.h>
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struct vhost_device;
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enum {
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/* Enough place for all fragments, head, and virtio net header. */
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VHOST_NET_MAX_SG = MAX_SKB_FRAGS + 2,
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};
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/* Poll a file (eventfd or socket) */
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/* Note: there's nothing vhost specific about this structure. */
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struct vhost_poll {
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poll_table table;
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wait_queue_head_t *wqh;
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wait_queue_t wait;
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/* struct which will handle all actual work. */
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struct work_struct work;
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unsigned long mask;
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};
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void vhost_poll_init(struct vhost_poll *poll, work_func_t func,
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unsigned long mask);
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void vhost_poll_start(struct vhost_poll *poll, struct file *file);
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void vhost_poll_stop(struct vhost_poll *poll);
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void vhost_poll_flush(struct vhost_poll *poll);
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void vhost_poll_queue(struct vhost_poll *poll);
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struct vhost_log {
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u64 addr;
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u64 len;
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};
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/* The virtqueue structure describes a queue attached to a device. */
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struct vhost_virtqueue {
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struct vhost_dev *dev;
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/* The actual ring of buffers. */
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struct mutex mutex;
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unsigned int num;
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struct vring_desc __user *desc;
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struct vring_avail __user *avail;
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struct vring_used __user *used;
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struct file *kick;
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struct file *call;
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struct file *error;
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struct eventfd_ctx *call_ctx;
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struct eventfd_ctx *error_ctx;
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struct eventfd_ctx *log_ctx;
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struct vhost_poll poll;
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/* The routine to call when the Guest pings us, or timeout. */
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work_func_t handle_kick;
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/* Last available index we saw. */
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u16 last_avail_idx;
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/* Caches available index value from user. */
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u16 avail_idx;
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/* Last index we used. */
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u16 last_used_idx;
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/* Used flags */
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u16 used_flags;
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/* Log writes to used structure. */
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bool log_used;
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u64 log_addr;
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struct iovec indirect[VHOST_NET_MAX_SG];
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struct iovec iov[VHOST_NET_MAX_SG];
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struct iovec hdr[VHOST_NET_MAX_SG];
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size_t hdr_size;
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/* We use a kind of RCU to access private pointer.
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* All readers access it from workqueue, which makes it possible to
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* flush the workqueue instead of synchronize_rcu. Therefore readers do
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* not need to call rcu_read_lock/rcu_read_unlock: the beginning of
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* work item execution acts instead of rcu_read_lock() and the end of
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* work item execution acts instead of rcu_read_lock().
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* Writers use virtqueue mutex. */
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void *private_data;
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/* Log write descriptors */
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void __user *log_base;
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struct vhost_log log[VHOST_NET_MAX_SG];
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};
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struct vhost_dev {
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/* Readers use RCU to access memory table pointer
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* log base pointer and features.
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* Writers use mutex below.*/
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struct vhost_memory *memory;
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struct mm_struct *mm;
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struct mutex mutex;
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unsigned acked_features;
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struct vhost_virtqueue *vqs;
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int nvqs;
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struct file *log_file;
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struct eventfd_ctx *log_ctx;
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};
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long vhost_dev_init(struct vhost_dev *, struct vhost_virtqueue *vqs, int nvqs);
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long vhost_dev_check_owner(struct vhost_dev *);
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long vhost_dev_reset_owner(struct vhost_dev *);
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void vhost_dev_cleanup(struct vhost_dev *);
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long vhost_dev_ioctl(struct vhost_dev *, unsigned int ioctl, unsigned long arg);
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int vhost_vq_access_ok(struct vhost_virtqueue *vq);
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int vhost_log_access_ok(struct vhost_dev *);
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int vhost_get_vq_desc(struct vhost_dev *, struct vhost_virtqueue *,
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struct iovec iov[], unsigned int iov_count,
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unsigned int *out_num, unsigned int *in_num,
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struct vhost_log *log, unsigned int *log_num);
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void vhost_discard_vq_desc(struct vhost_virtqueue *);
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int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
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void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *);
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void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *,
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unsigned int head, int len);
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void vhost_disable_notify(struct vhost_virtqueue *);
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bool vhost_enable_notify(struct vhost_virtqueue *);
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int vhost_log_write(struct vhost_virtqueue *vq, struct vhost_log *log,
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unsigned int log_num, u64 len);
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int vhost_init(void);
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void vhost_cleanup(void);
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#define vq_err(vq, fmt, ...) do { \
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pr_debug(pr_fmt(fmt), ##__VA_ARGS__); \
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if ((vq)->error_ctx) \
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eventfd_signal((vq)->error_ctx, 1);\
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} while (0)
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enum {
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VHOST_FEATURES = (1 << VIRTIO_F_NOTIFY_ON_EMPTY) |
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(1 << VIRTIO_RING_F_INDIRECT_DESC) |
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(1 << VHOST_F_LOG_ALL) |
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(1 << VHOST_NET_F_VIRTIO_NET_HDR),
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};
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static inline int vhost_has_feature(struct vhost_dev *dev, int bit)
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{
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unsigned acked_features = rcu_dereference(dev->acked_features);
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return acked_features & (1 << bit);
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}
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#endif
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