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34 #ifndef _VIRTIO_NET_H_
35 #define _VIRTIO_NET_H_
39 * Interface to vhost net
43 #include <linux/vhost.h>
44 #include <linux/virtio_ring.h>
45 #include <linux/virtio_net.h>
46 #include <sys/eventfd.h>
47 #include <sys/socket.h>
50 #include <rte_memory.h>
51 #include <rte_mempool.h>
52 #include <rte_ether.h>
54 #define RTE_VHOST_USER_CLIENT (1ULL << 0)
55 #define RTE_VHOST_USER_NO_RECONNECT (1ULL << 1)
56 #define RTE_VHOST_USER_DEQUEUE_ZERO_COPY (1ULL << 2)
58 /* Enum for virtqueue management. */
59 enum {VIRTIO_RXQ, VIRTIO_TXQ, VIRTIO_QNUM};
62 * Device and vring operations.
64 struct virtio_net_device_ops {
65 int (*new_device)(int vid); /**< Add device. */
66 void (*destroy_device)(int vid); /**< Remove device. */
68 int (*vring_state_changed)(int vid, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */
70 void *reserved[5]; /**< Reserved for future extension */
73 int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable);
76 * Register vhost driver. path could be different for multiple
79 int rte_vhost_driver_register(const char *path, uint64_t flags);
81 /* Unregister vhost driver. This is only meaningful to vhost user. */
82 int rte_vhost_driver_unregister(const char *path);
85 * Set the feature bits the vhost-user driver supports.
88 * The vhost-user socket file path
92 * 0 on success, -1 on failure
94 int rte_vhost_driver_set_features(const char *path, uint64_t features);
97 * Enable vhost-user driver features.
100 * - the param features should be a subset of the feature bits provided
101 * by rte_vhost_driver_set_features().
102 * - it must be invoked before vhost-user negotiation starts.
105 * The vhost-user socket file path
109 * 0 on success, -1 on failure
111 int rte_vhost_driver_enable_features(const char *path, uint64_t features);
114 * Disable vhost-user driver features.
116 * The two notes at rte_vhost_driver_enable_features() also apply here.
119 * The vhost-user socket file path
121 * Features to disable
123 * 0 on success, -1 on failure
125 int rte_vhost_driver_disable_features(const char *path, uint64_t features);
128 * Get the feature bits before feature negotiation.
131 * The vhost-user socket file path
133 * A pointer to store the queried feature bits
135 * 0 on success, -1 on failure
137 int rte_vhost_driver_get_features(const char *path, uint64_t *features);
139 /* Register callbacks. */
140 int rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const);
141 /* Start vhost driver session blocking loop. */
142 int rte_vhost_driver_session_start(void);
145 * Get the MTU value of the device if set in QEMU.
148 * virtio-net device ID
150 * The variable to store the MTU value
154 * -EAGAIN: device not yet started
155 * -ENOTSUP: device does not support MTU feature
157 int rte_vhost_get_mtu(int vid, uint16_t *mtu);
160 * Get the numa node from which the virtio net device's memory
164 * virtio-net device ID
167 * The numa node, -1 on failure
169 int rte_vhost_get_numa_node(int vid);
172 * Get the number of queues the device supports.
175 * virtio-net device ID
178 * The number of queues, 0 on failure
180 uint32_t rte_vhost_get_queue_num(int vid);
183 * Get the virtio net device's ifname, which is the vhost-user socket
187 * virtio-net device ID
189 * The buffer to stored the queried ifname
194 * 0 on success, -1 on failure
196 int rte_vhost_get_ifname(int vid, char *buf, size_t len);
199 * Get how many avail entries are left in the queue
202 * virtio-net device ID
207 * num of avail entires left
209 uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id);
212 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
213 * be received from the physical port or from another virtual device. A packet
214 * count is returned to indicate the number of packets that were succesfully
215 * added to the RX queue.
217 * virtio-net device ID
219 * virtio queue index in mq case
221 * array to contain packets to be enqueued
223 * packets num to be enqueued
225 * num of packets enqueued
227 uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
228 struct rte_mbuf **pkts, uint16_t count);
231 * This function gets guest buffers from the virtio device TX virtqueue,
232 * construct host mbufs, copies guest buffer content to host mbufs and
233 * store them in pkts to be processed.
237 * virtio queue index in mq case
239 * mbuf_pool where host mbuf is allocated.
241 * array to contain packets to be dequeued
243 * packets num to be dequeued
245 * num of packets dequeued
247 uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
248 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
250 #endif /* _VIRTIO_NET_H_ */