FreeBSD/Linux Kernel Cross Reference
sys/dev/virtio/virtqueue.h

     /*-
      * Copyright (c) 2011, Bryan Venteicher <bryanv@daemoninthecloset.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD: releng/8.4/sys/dev/virtio/virtqueue.h 247907 2013-03-07 06:53:25Z bryanv $
     */
    
    #ifndef _VIRTIO_VIRTQUEUE_H
    #define _VIRTIO_VIRTQUEUE_H
    
    struct virtqueue;
    struct sglist;
    
    /* Support for indirect buffer descriptors. */
    #define VIRTIO_RING_F_INDIRECT_DESC     (1 << 28)
    
    /* Support to suppress interrupt until specific index is reached. */
    #define VIRTIO_RING_F_EVENT_IDX         (1 << 29)
    
    /* Device callback for a virtqueue interrupt. */
    typedef int virtqueue_intr_t(void *);
    
    #define VIRTQUEUE_MAX_NAME_SZ   32
    
    /* One for each virtqueue the device wishes to allocate. */
    struct vq_alloc_info {
            char               vqai_name[VIRTQUEUE_MAX_NAME_SZ];
            int                vqai_maxindirsz;
            virtqueue_intr_t  *vqai_intr;
            void              *vqai_intr_arg;
            struct virtqueue **vqai_vq;
    };
    
    #define VQ_ALLOC_INFO_INIT(_i,_nsegs,_intr,_arg,_vqp,_str,...) do {     \
            snprintf((_i)->vqai_name, VIRTQUEUE_MAX_NAME_SZ, _str,          \
                ##__VA_ARGS__);                                             \
            (_i)->vqai_maxindirsz = (_nsegs);                               \
            (_i)->vqai_intr = (_intr);                                      \
            (_i)->vqai_intr_arg = (_arg);                                   \
            (_i)->vqai_vq = (_vqp);                                         \
    } while (0)
    
    uint64_t virtqueue_filter_features(uint64_t features);
    
    int      virtqueue_alloc(device_t dev, uint16_t queue, uint16_t size,
                 int align, vm_paddr_t highaddr, struct vq_alloc_info *info,
                 struct virtqueue **vqp);
    void    *virtqueue_drain(struct virtqueue *vq, int *last);
    void     virtqueue_free(struct virtqueue *vq);
    int      virtqueue_reinit(struct virtqueue *vq, uint16_t size);
    
    int      virtqueue_intr(struct virtqueue *vq);
    int      virtqueue_enable_intr(struct virtqueue *vq);
    int      virtqueue_postpone_intr(struct virtqueue *vq);
    void     virtqueue_disable_intr(struct virtqueue *vq);
    
    /* Get physical address of the virtqueue ring. */
    vm_paddr_t virtqueue_paddr(struct virtqueue *vq);
    
    int      virtqueue_full(struct virtqueue *vq);
    int      virtqueue_empty(struct virtqueue *vq);
    int      virtqueue_size(struct virtqueue *vq);
    int      virtqueue_nused(struct virtqueue *vq);
    void     virtqueue_notify(struct virtqueue *vq);
    void     virtqueue_dump(struct virtqueue *vq);
    
    int      virtqueue_enqueue(struct virtqueue *vq, void *cookie,
                 struct sglist *sg, int readable, int writable);
    void    *virtqueue_dequeue(struct virtqueue *vq, uint32_t *len);
    void    *virtqueue_poll(struct virtqueue *vq, uint32_t *len);
    
    #endif /* _VIRTIO_VIRTQUEUE_H */

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