ceph/src/dpdk/examples/vhost_xen/virtio-net.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _VIRTIO_NET_H_
  35 #define _VIRTIO_NET_H_
  36
  37 #include <stdint.h>
  38
  39 #define VQ_DESC_NUM 256
  40 /* Used to indicate that the device is running on a data core */
  41 #define VIRTIO_DEV_RUNNING 1
  42
  43 /*
  44  * Structure contains variables relevant to TX/RX virtqueues.
  45  */
  46 struct vhost_virtqueue
  47 {
  48         struct vring_desc  *desc;             /* Virtqueue descriptor ring. */
  49         struct vring_avail *avail;            /* Virtqueue available ring. */
  50         struct vring_used  *used;             /* Virtqueue used ring. */
  51         uint32_t           size;              /* Size of descriptor ring. */
  52         uint32_t           vhost_hlen;        /* Vhost header length (varies depending on RX merge buffers. */
  53         volatile uint16_t  last_used_idx;     /* Last index used on the available ring */
  54         volatile uint16_t  last_used_idx_res; /* Used for multiple devices reserving buffers. */
  55 } __rte_cache_aligned;
  56
  57 /*
  58  * Device structure contains all configuration information relating to the device.
  59  */
  60 struct virtio_net
  61 {
  62         struct vhost_virtqueue  *virtqueue_tx;  /* Contains all TX virtqueue information. */
  63         struct vhost_virtqueue  *virtqueue_rx;  /* Contains all RX virtqueue information. */
  64         struct virtio_memory    *mem;           /* QEMU memory and memory region information. */
  65         struct ether_addr       mac_address;    /* Device MAC address (Obtained on first TX packet). */
  66         uint32_t                flags;          /* Device flags. Only used to check if device is running on data core. */
  67         uint32_t                vlan_tag;       /* Vlan tag for device. Currently set to device_id (0-63). */
  68         uint32_t                vmdq_rx_q;
  69         uint64_t                device_fh;      /* device identifier. */
  70         uint16_t                coreid;
  71         volatile uint8_t        ready;          /* A device is set as ready if the MAC address has been set. */
  72         volatile uint8_t        remove;         /* Device is marked for removal from the data core. */
  73         uint32_t                virtio_idx;     /* Index of virtio device */
  74         uint32_t                dom_id;         /* Domain id of xen guest */
  75 } ___rte_cache_aligned;
  76
  77 /*
  78  * Device linked list structure for configuration.
  79  */
  80 struct virtio_net_config_ll
  81 {
  82         struct virtio_net               dev;    /* Virtio device. */
  83         struct virtio_net_config_ll     *next; /* Next entry on linked list. */
  84 };
  85
  86 /*
  87  * Information relating to memory regions including offsets to addresses in QEMUs memory file.
  88  */
  89 struct virtio_memory_regions {
  90         uint64_t        guest_phys_address;     /* Base guest physical address of region. */
  91         uint64_t        guest_phys_address_end; /* End guest physical address of region. */
  92         uint64_t        memory_size;            /* Size of region. */
  93         uint64_t        userspace_address;      /* Base userspace address of region. */
  94         uint64_t        address_offset;         /* Offset of region for address translation. */
  95 };
  96
  97 /*
  98  * Memory structure includes region and mapping information.
  99  */
 100 struct virtio_memory {
 101         uint32_t                        nregions;       /* Number of memory regions. */
 102         struct virtio_memory_regions    regions[0];     /* Memory region information. */
 103 };
 104
 105 /*
 106  * Device operations to add/remove device.
 107  */
 108 struct virtio_net_device_ops {
 109         int (* new_device)(struct virtio_net *);        /* Add device. */
 110         void (* destroy_device) (volatile struct virtio_net *); /* Remove device. */
 111 };
 112
 113 #endif