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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 */
74 * Disable features in feature_mask. Returns 0 on success.
76 int rte_vhost_feature_disable(uint64_t feature_mask);
79 * Enable features in feature_mask. Returns 0 on success.
81 int rte_vhost_feature_enable(uint64_t feature_mask);
83 /* Returns currently supported vhost features */
84 uint64_t rte_vhost_feature_get(void);
86 int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable);
89 * Register vhost driver. path could be different for multiple
92 int rte_vhost_driver_register(const char *path, uint64_t flags);
94 /* Unregister vhost driver. This is only meaningful to vhost user. */
95 int rte_vhost_driver_unregister(const char *path);
98 * Set the feature bits the vhost-user driver supports.
101 * The vhost-user socket file path
105 * 0 on success, -1 on failure
107 int rte_vhost_driver_set_features(const char *path, uint64_t features);
110 * Enable vhost-user driver features.
113 * - the param features should be a subset of the feature bits provided
114 * by rte_vhost_driver_set_features().
115 * - it must be invoked before vhost-user negotiation starts.
118 * The vhost-user socket file path
122 * 0 on success, -1 on failure
124 int rte_vhost_driver_enable_features(const char *path, uint64_t features);
127 * Disable vhost-user driver features.
129 * The two notes at rte_vhost_driver_enable_features() also apply here.
132 * The vhost-user socket file path
134 * Features to disable
136 * 0 on success, -1 on failure
138 int rte_vhost_driver_disable_features(const char *path, uint64_t features);
141 * Get the feature bits before feature negotiation.
144 * The vhost-user socket file path
146 * A pointer to store the queried feature bits
148 * 0 on success, -1 on failure
150 int rte_vhost_driver_get_features(const char *path, uint64_t *features);
152 /* Register callbacks. */
153 int rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const);
154 /* Start vhost driver session blocking loop. */
155 int rte_vhost_driver_session_start(void);
158 * Get the MTU value of the device if set in QEMU.
161 * virtio-net device ID
163 * The variable to store the MTU value
167 * -EAGAIN: device not yet started
168 * -ENOTSUP: device does not support MTU feature
170 int rte_vhost_get_mtu(int vid, uint16_t *mtu);
173 * Get the numa node from which the virtio net device's memory
177 * virtio-net device ID
180 * The numa node, -1 on failure
182 int rte_vhost_get_numa_node(int vid);
185 * Get the number of queues the device supports.
188 * virtio-net device ID
191 * The number of queues, 0 on failure
193 uint32_t rte_vhost_get_queue_num(int vid);
196 * Get the virtio net device's ifname, which is the vhost-user socket
200 * virtio-net device ID
202 * The buffer to stored the queried ifname
207 * 0 on success, -1 on failure
209 int rte_vhost_get_ifname(int vid, char *buf, size_t len);
212 * Get how many avail entries are left in the queue
215 * virtio-net device ID
220 * num of avail entires left
222 uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id);
225 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
226 * be received from the physical port or from another virtual device. A packet
227 * count is returned to indicate the number of packets that were succesfully
228 * added to the RX queue.
230 * virtio-net device ID
232 * virtio queue index in mq case
234 * array to contain packets to be enqueued
236 * packets num to be enqueued
238 * num of packets enqueued
240 uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
241 struct rte_mbuf **pkts, uint16_t count);
244 * This function gets guest buffers from the virtio device TX virtqueue,
245 * construct host mbufs, copies guest buffer content to host mbufs and
246 * store them in pkts to be processed.
250 * virtio queue index in mq case
252 * mbuf_pool where host mbuf is allocated.
254 * array to contain packets to be dequeued
256 * packets num to be dequeued
258 * num of packets dequeued
260 uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
261 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
263 #endif /* _VIRTIO_NET_H_ */