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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 <sys/eventfd.h>
47 #include <rte_memory.h>
48 #include <rte_mempool.h>
50 #define RTE_VHOST_USER_CLIENT (1ULL << 0)
51 #define RTE_VHOST_USER_NO_RECONNECT (1ULL << 1)
52 #define RTE_VHOST_USER_DEQUEUE_ZERO_COPY (1ULL << 2)
55 * Information relating to memory regions including offsets to
56 * addresses in QEMUs memory file.
58 struct rte_vhost_mem_region {
59 uint64_t guest_phys_addr;
60 uint64_t guest_user_addr;
61 uint64_t host_user_addr;
69 * Memory structure includes region and mapping information.
71 struct rte_vhost_memory {
73 struct rte_vhost_mem_region regions[0];
76 struct rte_vhost_vring {
77 struct vring_desc *desc;
78 struct vring_avail *avail;
79 struct vring_used *used;
80 uint64_t log_guest_addr;
88 * Device and vring operations.
90 struct virtio_net_device_ops {
91 int (*new_device)(int vid); /**< Add device. */
92 void (*destroy_device)(int vid); /**< Remove device. */
94 int (*vring_state_changed)(int vid, uint16_t queue_id, int enable); /**< triggered when a vring is enabled or disabled */
96 void *reserved[5]; /**< Reserved for future extension */
100 * Convert guest physical address to host virtual address
103 * the guest memory regions
105 * the guest physical address for querying
107 * the host virtual address on success, 0 on failure
109 static inline uint64_t __attribute__((always_inline))
110 rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa)
112 struct rte_vhost_mem_region *reg;
115 for (i = 0; i < mem->nregions; i++) {
116 reg = &mem->regions[i];
117 if (gpa >= reg->guest_phys_addr &&
118 gpa < reg->guest_phys_addr + reg->size) {
119 return gpa - reg->guest_phys_addr +
127 int rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable);
130 * Register vhost driver. path could be different for multiple
133 int rte_vhost_driver_register(const char *path, uint64_t flags);
135 /* Unregister vhost driver. This is only meaningful to vhost user. */
136 int rte_vhost_driver_unregister(const char *path);
139 * Set the feature bits the vhost-user driver supports.
142 * The vhost-user socket file path
146 * 0 on success, -1 on failure
148 int rte_vhost_driver_set_features(const char *path, uint64_t features);
151 * Enable vhost-user driver features.
154 * - the param features should be a subset of the feature bits provided
155 * by rte_vhost_driver_set_features().
156 * - it must be invoked before vhost-user negotiation starts.
159 * The vhost-user socket file path
163 * 0 on success, -1 on failure
165 int rte_vhost_driver_enable_features(const char *path, uint64_t features);
168 * Disable vhost-user driver features.
170 * The two notes at rte_vhost_driver_enable_features() also apply here.
173 * The vhost-user socket file path
175 * Features to disable
177 * 0 on success, -1 on failure
179 int rte_vhost_driver_disable_features(const char *path, uint64_t features);
182 * Get the feature bits before feature negotiation.
185 * The vhost-user socket file path
187 * A pointer to store the queried feature bits
189 * 0 on success, -1 on failure
191 int rte_vhost_driver_get_features(const char *path, uint64_t *features);
194 * Get the feature bits after negotiation
199 * A pointer to store the queried feature bits
201 * 0 on success, -1 on failure
203 int rte_vhost_get_negotiated_features(int vid, uint64_t *features);
205 /* Register callbacks. */
206 int rte_vhost_driver_callback_register(const char *path,
207 struct virtio_net_device_ops const * const ops);
208 /* Start vhost driver session blocking loop. */
209 int rte_vhost_driver_session_start(void);
212 * Get the MTU value of the device if set in QEMU.
215 * virtio-net device ID
217 * The variable to store the MTU value
221 * -EAGAIN: device not yet started
222 * -ENOTSUP: device does not support MTU feature
224 int rte_vhost_get_mtu(int vid, uint16_t *mtu);
227 * Get the numa node from which the virtio net device's memory
231 * virtio-net device ID
234 * The numa node, -1 on failure
236 int rte_vhost_get_numa_node(int vid);
240 * Get the number of queues the device supports.
242 * Note this function is deprecated, as it returns a queue pair number,
243 * which is virtio-net specific. Instead, rte_vhost_get_vring_num should
247 * virtio-net device ID
250 * The number of queues, 0 on failure
253 uint32_t rte_vhost_get_queue_num(int vid);
256 * Get the number of vrings the device supports.
262 * The number of vrings, 0 on failure
264 uint16_t rte_vhost_get_vring_num(int vid);
267 * Get the virtio net device's ifname, which is the vhost-user socket
271 * virtio-net device ID
273 * The buffer to stored the queried ifname
278 * 0 on success, -1 on failure
280 int rte_vhost_get_ifname(int vid, char *buf, size_t len);
283 * Get how many avail entries are left in the queue
286 * virtio-net device ID
291 * num of avail entires left
293 uint16_t rte_vhost_avail_entries(int vid, uint16_t queue_id);
296 * This function adds buffers to the virtio devices RX virtqueue. Buffers can
297 * be received from the physical port or from another virtual device. A packet
298 * count is returned to indicate the number of packets that were succesfully
299 * added to the RX queue.
301 * virtio-net device ID
303 * virtio queue index in mq case
305 * array to contain packets to be enqueued
307 * packets num to be enqueued
309 * num of packets enqueued
311 uint16_t rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
312 struct rte_mbuf **pkts, uint16_t count);
315 * This function gets guest buffers from the virtio device TX virtqueue,
316 * construct host mbufs, copies guest buffer content to host mbufs and
317 * store them in pkts to be processed.
321 * virtio queue index in mq case
323 * mbuf_pool where host mbuf is allocated.
325 * array to contain packets to be dequeued
327 * packets num to be dequeued
329 * num of packets dequeued
331 uint16_t rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
332 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count);
335 * Get guest mem table: a list of memory regions.
337 * An rte_vhost_vhost_memory object will be allocated internaly, to hold the
338 * guest memory regions. Application should free it at destroy_device()
344 * To store the returned mem regions
346 * 0 on success, -1 on failure
348 int rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);
351 * Get guest vring info, including the vring address, vring size, etc.
358 * the structure to hold the requested vring info
360 * 0 on success, -1 on failure
362 int rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
363 struct rte_vhost_vring *vring);
365 #endif /* _VIRTIO_NET_H_ */