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34 #ifndef _VIRTIO_NET_H_
35 #define _VIRTIO_NET_H_
37 /* Used to indicate that the device is running on a data core */
38 #define VIRTIO_DEV_RUNNING 1
40 /* Backend value set by guest. */
41 #define VIRTIO_DEV_STOPPED -1
44 /* Enum for virtqueue management. */
45 enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
47 #define BUF_VECTOR_MAX 256
50 * Structure contains buffer address, length and descriptor index
51 * from vring to do scatter RX.
60 * Structure contains variables relevant to TX/RX virtqueues.
62 struct vhost_virtqueue
64 struct vring_desc *desc; /* Virtqueue descriptor ring. */
65 struct vring_avail *avail; /* Virtqueue available ring. */
66 struct vring_used *used; /* Virtqueue used ring. */
67 uint32_t size; /* Size of descriptor ring. */
68 uint32_t backend; /* Backend value to determine if device should started/stopped. */
69 uint16_t vhost_hlen; /* Vhost header length (varies depending on RX merge buffers. */
70 volatile uint16_t last_used_idx; /* Last index used on the available ring */
71 volatile uint16_t last_used_idx_res; /* Used for multiple devices reserving buffers. */
72 eventfd_t callfd; /* Currently unused as polling mode is enabled. */
73 eventfd_t kickfd; /* Used to notify the guest (trigger interrupt). */
74 /* Used for scatter RX. */
75 struct buf_vector buf_vec[BUF_VECTOR_MAX];
76 } __rte_cache_aligned;
79 * Device structure contains all configuration information relating to the device.
83 struct vhost_virtqueue *virtqueue[VIRTIO_QNUM]; /* Contains all virtqueue information. */
84 struct virtio_memory *mem; /* QEMU memory and memory region information. */
85 uint64_t features; /* Negotiated feature set. */
86 uint64_t device_fh; /* device identifier. */
87 uint32_t flags; /* Device flags. Only used to check if device is running on data core. */
88 } __rte_cache_aligned;
91 * Device linked list structure for configuration.
93 struct virtio_net_config_ll
95 struct virtio_net dev; /* Virtio device. */
96 struct virtio_net_config_ll *next; /* Next entry on linked list. */
100 * Information relating to memory regions including offsets to addresses in QEMUs memory file.
102 struct virtio_memory_regions {
103 uint64_t guest_phys_address; /* Base guest physical address of region. */
104 uint64_t guest_phys_address_end; /* End guest physical address of region. */
105 uint64_t memory_size; /* Size of region. */
106 uint64_t userspace_address; /* Base userspace address of region. */
107 uint64_t address_offset; /* Offset of region for address translation. */
112 * Memory structure includes region and mapping information.
114 struct virtio_memory {
115 uint64_t base_address; /* Base QEMU userspace address of the memory file. */
116 uint64_t mapped_address; /* Mapped address of memory file base in our applications memory space. */
117 uint64_t mapped_size; /* Total size of memory file. */
118 uint32_t nregions; /* Number of memory regions. */
119 /* Memory region information. */
120 struct virtio_memory_regions regions[0];
124 * Device operations to add/remove device.
126 struct virtio_net_device_ops {
127 int (* new_device) (struct virtio_net *); /* Add device. */
128 void (* destroy_device) (volatile struct virtio_net *); /* Remove device. */
131 int init_virtio_net(struct virtio_net_device_ops const * const);
132 int deinit_virtio_net(void);
134 struct vhost_net_device_ops const * get_virtio_net_callbacks(void);
136 #endif /* _VIRTIO_NET_H_ */