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34 #ifndef _VIRTIO_NET_H_
35 #define _VIRTIO_NET_H_
38 #include <linux/virtio_ring.h>
39 #include <linux/virtio_net.h>
40 #include <sys/eventfd.h>
42 #include <rte_memory.h>
43 #include <rte_mempool.h>
46 /* Used to indicate that the device is running on a data core */
47 #define VIRTIO_DEV_RUNNING 1
49 /* Backend value set by guest. */
50 #define VIRTIO_DEV_STOPPED -1
53 /* Enum for virtqueue management. */
54 enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
56 #define BUF_VECTOR_MAX 256
59 * Structure contains buffer address, length and descriptor index
60 * from vring to do scatter RX.
69 * Structure contains variables relevant to RX/TX virtqueues.
71 struct vhost_virtqueue {
72 struct vring_desc *desc; /**< Virtqueue descriptor ring. */
73 struct vring_avail *avail; /**< Virtqueue available ring. */
74 struct vring_used *used; /**< Virtqueue used ring. */
75 uint32_t size; /**< Size of descriptor ring. */
76 uint32_t backend; /**< Backend value to determine if device should started/stopped. */
77 uint16_t vhost_hlen; /**< Vhost header length (varies depending on RX merge buffers. */
78 volatile uint16_t last_used_idx; /**< Last index used on the available ring */
79 volatile uint16_t last_used_idx_res; /**< Used for multiple devices reserving buffers. */
80 eventfd_t callfd; /**< Currently unused as polling mode is enabled. */
81 eventfd_t kickfd; /**< Used to notify the guest (trigger interrupt). */
82 struct buf_vector buf_vec[BUF_VECTOR_MAX]; /**< for scatter RX. */
83 } __rte_cache_aligned;
86 * Device structure contains all configuration information relating to the device.
90 struct vhost_virtqueue *virtqueue[VIRTIO_QNUM]; /**< Contains all virtqueue information. */
91 struct virtio_memory *mem; /**< QEMU memory and memory region information. */
92 uint64_t features; /**< Negotiated feature set. */
93 uint64_t device_fh; /**< device identifier. */
94 uint32_t flags; /**< Device flags. Only used to check if device is running on data core. */
95 void *priv; /**< private context */
96 } __rte_cache_aligned;
99 * Information relating to memory regions including offsets to addresses in QEMUs memory file.
101 struct virtio_memory_regions {
102 uint64_t guest_phys_address; /**< Base guest physical address of region. */
103 uint64_t guest_phys_address_end; /**< End guest physical address of region. */
104 uint64_t memory_size; /**< Size of region. */
105 uint64_t userspace_address; /**< Base userspace address of region. */
106 uint64_t address_offset; /**< Offset of region for address translation. */
111 * Memory structure includes region and mapping information.
113 struct virtio_memory {
114 uint64_t base_address; /**< Base QEMU userspace address of the memory file. */
115 uint64_t mapped_address; /**< Mapped address of memory file base in our applications memory space. */
116 uint64_t mapped_size; /**< Total size of memory file. */
117 uint32_t nregions; /**< Number of memory regions. */
118 struct virtio_memory_regions regions[0]; /**< Memory region information. */
122 * Device operations to add/remove device.
124 struct virtio_net_device_ops {
125 int (*new_device)(struct virtio_net *); /**< Add device. */
126 void (*destroy_device)(volatile struct virtio_net *); /**< Remove device. */
129 static inline uint16_t __attribute__((always_inline))
130 rte_vring_available_entries(struct virtio_net *dev, uint16_t queue_id)
132 struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
133 return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx_res;
137 * Function to convert guest physical addresses to vhost virtual addresses.
138 * This is used to convert guest virtio buffer addresses.
140 static inline uint64_t __attribute__((always_inline))
141 gpa_to_vva(struct virtio_net *dev, uint64_t guest_pa)
143 struct virtio_memory_regions *region;
145 uint64_t vhost_va = 0;
147 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
148 region = &dev->mem->regions[regionidx];
149 if ((guest_pa >= region->guest_phys_address) &&
150 (guest_pa <= region->guest_phys_address_end)) {
151 vhost_va = region->address_offset + guest_pa;
159 * Disable features in feature_mask. Returns 0 on success.
161 int rte_vhost_feature_disable(uint64_t feature_mask);
164 * Enable features in feature_mask. Returns 0 on success.
166 int rte_vhost_feature_enable(uint64_t feature_mask);
168 /* Returns currently supported vhost features */
169 uint64_t rte_vhost_feature_get(void);
171 int rte_vhost_enable_guest_notification(struct virtio_net *dev, uint16_t queue_id, int enable);
173 /* Register vhost driver. dev_name could be different for multiple instance support. */
174 int rte_vhost_driver_register(const char *dev_name);
176 /* Register callbacks. */
177 int rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const);
178 /* Start vhost driver session blocking loop. */
179 int rte_vhost_driver_session_start(void);
182 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
183 * be received from the physical port or from another virtual device. A packet
184 * count is returned to indicate the number of packets that were succesfully
185 * added to the RX queue.
187 * virtio queue index in mq case
189 * num of packets enqueued
191 uint16_t rte_vhost_enqueue_burst(struct virtio_net *dev, uint16_t queue_id,
192 struct rte_mbuf **pkts, uint16_t count);
195 * This function gets guest buffers from the virtio device TX virtqueue,
196 * construct host mbufs, copies guest buffer content to host mbufs and
197 * store them in pkts to be processed.
199 * mbuf_pool where host mbuf is allocated.
201 * virtio queue index in mq case.
203 * num of packets dequeued
205 uint16_t rte_vhost_dequeue_burst(struct virtio_net *dev, uint16_t queue_id,
206 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
208 #endif /* _VIRTIO_NET_H_ */