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34 #include <linux/vhost.h>
35 #include <linux/virtio_net.h>
39 #ifdef RTE_LIBRTE_VHOST_NUMA
43 #include <rte_ethdev.h>
45 #include <rte_string_fns.h>
46 #include <rte_memory.h>
47 #include <rte_malloc.h>
48 #include <rte_virtio_net.h>
52 #define VHOST_USER_F_PROTOCOL_FEATURES 30
54 /* Features supported by this lib. */
55 #define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
56 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
57 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
58 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
59 (VHOST_SUPPORTS_MQ) | \
60 (1ULL << VIRTIO_F_VERSION_1) | \
61 (1ULL << VHOST_F_LOG_ALL) | \
62 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
63 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
64 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
65 (1ULL << VIRTIO_NET_F_CSUM) | \
66 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
67 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
68 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \
69 (1ULL << VIRTIO_RING_F_INDIRECT_DESC))
71 uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
73 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
75 /* device ops to add/remove device to/from data core. */
76 struct virtio_net_device_ops const *notify_ops;
81 struct virtio_net *dev = vhost_devices[vid];
84 RTE_LOG(ERR, VHOST_CONFIG,
85 "(%d) device not found.\n", vid);
92 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
94 if ((vq->callfd >= 0) && (destroy != 0))
101 * Unmap any memory, close any file descriptors and
102 * free any memory owned by a device.
105 cleanup_device(struct virtio_net *dev, int destroy)
109 vhost_backend_cleanup(dev);
111 for (i = 0; i < dev->virt_qp_nb; i++) {
112 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ], destroy);
113 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ], destroy);
118 * Release virtqueues and device memory.
121 free_device(struct virtio_net *dev)
125 for (i = 0; i < dev->virt_qp_nb; i++)
126 rte_free(dev->virtqueue[i * VIRTIO_QNUM]);
132 init_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
134 memset(vq, 0, sizeof(struct vhost_virtqueue));
136 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
137 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
139 /* Backends are set to -1 indicating an inactive device. */
142 /* always set the default vq pair to enabled */
148 init_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
150 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
152 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
153 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
157 reset_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
162 init_vring_queue(vq, qp_idx);
167 reset_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
169 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
171 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
172 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
176 alloc_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
178 struct vhost_virtqueue *virtqueue = NULL;
179 uint32_t virt_rx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_RXQ;
180 uint32_t virt_tx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_TXQ;
182 virtqueue = rte_malloc(NULL,
183 sizeof(struct vhost_virtqueue) * VIRTIO_QNUM, 0);
184 if (virtqueue == NULL) {
185 RTE_LOG(ERR, VHOST_CONFIG,
186 "Failed to allocate memory for virt qp:%d.\n", qp_idx);
190 dev->virtqueue[virt_rx_q_idx] = virtqueue;
191 dev->virtqueue[virt_tx_q_idx] = virtqueue + VIRTIO_TXQ;
193 init_vring_queue_pair(dev, qp_idx);
195 dev->virt_qp_nb += 1;
201 * Reset some variables in device structure, while keeping few
202 * others untouched, such as vid, ifname, virt_qp_nb: they
203 * should be same unless the device is removed.
206 reset_device(struct virtio_net *dev)
211 dev->protocol_features = 0;
214 for (i = 0; i < dev->virt_qp_nb; i++)
215 reset_vring_queue_pair(dev, i);
219 * Function is called from the CUSE open function. The device structure is
220 * initialised and a new entry is added to the device configuration linked
224 vhost_new_device(void)
226 struct virtio_net *dev;
229 dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
231 RTE_LOG(ERR, VHOST_CONFIG,
232 "Failed to allocate memory for new dev.\n");
236 for (i = 0; i < MAX_VHOST_DEVICE; i++) {
237 if (vhost_devices[i] == NULL)
240 if (i == MAX_VHOST_DEVICE) {
241 RTE_LOG(ERR, VHOST_CONFIG,
242 "Failed to find a free slot for new device.\n");
246 vhost_devices[i] = dev;
253 * Function is called from the CUSE release function. This function will
254 * cleanup the device and remove it from device configuration linked list.
257 vhost_destroy_device(int vid)
259 struct virtio_net *dev = get_device(vid);
264 if (dev->flags & VIRTIO_DEV_RUNNING) {
265 dev->flags &= ~VIRTIO_DEV_RUNNING;
266 notify_ops->destroy_device(vid);
269 cleanup_device(dev, 1);
272 vhost_devices[vid] = NULL;
276 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
278 struct virtio_net *dev;
281 dev = get_device(vid);
285 len = if_len > sizeof(dev->ifname) ?
286 sizeof(dev->ifname) : if_len;
288 strncpy(dev->ifname, if_name, len);
289 dev->ifname[sizeof(dev->ifname) - 1] = '\0';
294 rte_vhost_get_numa_node(int vid)
296 #ifdef RTE_LIBRTE_VHOST_NUMA
297 struct virtio_net *dev = get_device(vid);
304 ret = get_mempolicy(&numa_node, NULL, 0, dev,
305 MPOL_F_NODE | MPOL_F_ADDR);
307 RTE_LOG(ERR, VHOST_CONFIG,
308 "(%d) failed to query numa node: %d\n", vid, ret);
320 rte_vhost_get_queue_num(int vid)
322 struct virtio_net *dev = get_device(vid);
327 return dev->virt_qp_nb;
331 rte_vhost_get_ifname(int vid, char *buf, size_t len)
333 struct virtio_net *dev = get_device(vid);
338 len = RTE_MIN(len, sizeof(dev->ifname));
340 strncpy(buf, dev->ifname, len);
347 rte_vhost_avail_entries(int vid, uint16_t queue_id)
349 struct virtio_net *dev;
350 struct vhost_virtqueue *vq;
352 dev = get_device(vid);
356 vq = dev->virtqueue[queue_id];
360 return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
364 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
366 struct virtio_net *dev = get_device(vid);
372 RTE_LOG(ERR, VHOST_CONFIG,
373 "guest notification isn't supported.\n");
377 dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
381 uint64_t rte_vhost_feature_get(void)
383 return VHOST_FEATURES;
386 int rte_vhost_feature_disable(uint64_t feature_mask)
388 VHOST_FEATURES = VHOST_FEATURES & ~feature_mask;
392 int rte_vhost_feature_enable(uint64_t feature_mask)
394 if ((feature_mask & VHOST_SUPPORTED_FEATURES) == feature_mask) {
395 VHOST_FEATURES = VHOST_FEATURES | feature_mask;
402 * Register ops so that we can add/remove device to data core.
405 rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const ops)