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34 #include <linux/vhost.h>
35 #include <linux/virtio_net.h>
39 #ifdef RTE_LIBRTE_VHOST_NUMA
43 #include <rte_errno.h>
44 #include <rte_ethdev.h>
46 #include <rte_string_fns.h>
47 #include <rte_memory.h>
48 #include <rte_malloc.h>
49 #include <rte_vhost.h>
50 #include <rte_rwlock.h>
54 #include "vhost_user.h"
56 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
59 __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
60 uint64_t iova, uint64_t size, uint8_t perm)
62 uint64_t vva, tmp_size;
69 vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
73 if (!vhost_user_iotlb_pending_miss(vq, iova + tmp_size, perm)) {
74 vhost_user_iotlb_pending_insert(vq, iova + tmp_size, perm);
75 vhost_user_iotlb_miss(dev, iova + tmp_size, perm);
84 struct virtio_net *dev = vhost_devices[vid];
87 RTE_LOG(ERR, VHOST_CONFIG,
88 "(%d) device not found.\n", vid);
95 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
97 if ((vq->callfd >= 0) && (destroy != 0))
104 * Unmap any memory, close any file descriptors and
105 * free any memory owned by a device.
108 cleanup_device(struct virtio_net *dev, int destroy)
112 vhost_backend_cleanup(dev);
114 for (i = 0; i < dev->nr_vring; i++)
115 cleanup_vq(dev->virtqueue[i], destroy);
119 * Release virtqueues and device memory.
122 free_device(struct virtio_net *dev)
125 struct vhost_virtqueue *vq;
127 for (i = 0; i < dev->nr_vring; i++) {
128 vq = dev->virtqueue[i];
130 rte_free(vq->shadow_used_ring);
131 rte_free(vq->batch_copy_elems);
132 rte_mempool_free(vq->iotlb_pool);
140 init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
142 struct vhost_virtqueue *vq;
144 if (vring_idx >= VHOST_MAX_VRING) {
145 RTE_LOG(ERR, VHOST_CONFIG,
146 "Failed not init vring, out of bound (%d)\n",
151 vq = dev->virtqueue[vring_idx];
153 memset(vq, 0, sizeof(struct vhost_virtqueue));
155 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
156 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
158 vhost_user_iotlb_init(dev, vring_idx);
159 /* Backends are set to -1 indicating an inactive device. */
163 * always set the vq to enabled; this is to keep compatibility
164 * with the old QEMU, whereas there is no SET_VRING_ENABLE message.
168 TAILQ_INIT(&vq->zmbuf_list);
172 reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
174 struct vhost_virtqueue *vq;
177 if (vring_idx >= VHOST_MAX_VRING) {
178 RTE_LOG(ERR, VHOST_CONFIG,
179 "Failed not init vring, out of bound (%d)\n",
184 vq = dev->virtqueue[vring_idx];
186 init_vring_queue(dev, vring_idx);
191 alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
193 struct vhost_virtqueue *vq;
195 vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
197 RTE_LOG(ERR, VHOST_CONFIG,
198 "Failed to allocate memory for vring:%u.\n", vring_idx);
202 dev->virtqueue[vring_idx] = vq;
203 init_vring_queue(dev, vring_idx);
211 * Reset some variables in device structure, while keeping few
212 * others untouched, such as vid, ifname, nr_vring: they
213 * should be same unless the device is removed.
216 reset_device(struct virtio_net *dev)
221 dev->protocol_features = 0;
224 for (i = 0; i < dev->nr_vring; i++)
225 reset_vring_queue(dev, i);
229 * Invoked when there is a new vhost-user connection established (when
230 * there is a new virtio device being attached).
233 vhost_new_device(void)
235 struct virtio_net *dev;
238 dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
240 RTE_LOG(ERR, VHOST_CONFIG,
241 "Failed to allocate memory for new dev.\n");
245 for (i = 0; i < MAX_VHOST_DEVICE; i++) {
246 if (vhost_devices[i] == NULL)
249 if (i == MAX_VHOST_DEVICE) {
250 RTE_LOG(ERR, VHOST_CONFIG,
251 "Failed to find a free slot for new device.\n");
256 vhost_devices[i] = dev;
258 dev->slave_req_fd = -1;
264 * Invoked when there is the vhost-user connection is broken (when
265 * the virtio device is being detached).
268 vhost_destroy_device(int vid)
270 struct virtio_net *dev = get_device(vid);
275 if (dev->flags & VIRTIO_DEV_RUNNING) {
276 dev->flags &= ~VIRTIO_DEV_RUNNING;
277 dev->notify_ops->destroy_device(vid);
280 cleanup_device(dev, 1);
283 vhost_devices[vid] = NULL;
287 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
289 struct virtio_net *dev;
292 dev = get_device(vid);
296 len = if_len > sizeof(dev->ifname) ?
297 sizeof(dev->ifname) : if_len;
299 strncpy(dev->ifname, if_name, len);
300 dev->ifname[sizeof(dev->ifname) - 1] = '\0';
304 vhost_enable_dequeue_zero_copy(int vid)
306 struct virtio_net *dev = get_device(vid);
311 dev->dequeue_zero_copy = 1;
315 rte_vhost_get_mtu(int vid, uint16_t *mtu)
317 struct virtio_net *dev = get_device(vid);
322 if (!(dev->flags & VIRTIO_DEV_READY))
325 if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
334 rte_vhost_get_numa_node(int vid)
336 #ifdef RTE_LIBRTE_VHOST_NUMA
337 struct virtio_net *dev = get_device(vid);
344 ret = get_mempolicy(&numa_node, NULL, 0, dev,
345 MPOL_F_NODE | MPOL_F_ADDR);
347 RTE_LOG(ERR, VHOST_CONFIG,
348 "(%d) failed to query numa node: %s\n",
349 vid, rte_strerror(errno));
361 rte_vhost_get_queue_num(int vid)
363 struct virtio_net *dev = get_device(vid);
368 return dev->nr_vring / 2;
372 rte_vhost_get_vring_num(int vid)
374 struct virtio_net *dev = get_device(vid);
379 return dev->nr_vring;
383 rte_vhost_get_ifname(int vid, char *buf, size_t len)
385 struct virtio_net *dev = get_device(vid);
390 len = RTE_MIN(len, sizeof(dev->ifname));
392 strncpy(buf, dev->ifname, len);
399 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
401 struct virtio_net *dev;
403 dev = get_device(vid);
407 *features = dev->features;
412 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
414 struct virtio_net *dev;
415 struct rte_vhost_memory *m;
418 dev = get_device(vid);
422 size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
423 m = malloc(sizeof(struct rte_vhost_memory) + size);
427 m->nregions = dev->mem->nregions;
428 memcpy(m->regions, dev->mem->regions, size);
435 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
436 struct rte_vhost_vring *vring)
438 struct virtio_net *dev;
439 struct vhost_virtqueue *vq;
441 dev = get_device(vid);
445 if (vring_idx >= VHOST_MAX_VRING)
448 vq = dev->virtqueue[vring_idx];
452 vring->desc = vq->desc;
453 vring->avail = vq->avail;
454 vring->used = vq->used;
455 vring->log_guest_addr = vq->log_guest_addr;
457 vring->callfd = vq->callfd;
458 vring->kickfd = vq->kickfd;
459 vring->size = vq->size;
465 rte_vhost_avail_entries(int vid, uint16_t queue_id)
467 struct virtio_net *dev;
468 struct vhost_virtqueue *vq;
470 dev = get_device(vid);
474 vq = dev->virtqueue[queue_id];
478 return *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
482 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
484 struct virtio_net *dev = get_device(vid);
490 RTE_LOG(ERR, VHOST_CONFIG,
491 "guest notification isn't supported.\n");
495 dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
500 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
502 struct virtio_net *dev = get_device(vid);
507 vhost_log_write(dev, addr, len);
511 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
512 uint64_t offset, uint64_t len)
514 struct virtio_net *dev;
515 struct vhost_virtqueue *vq;
517 dev = get_device(vid);
521 if (vring_idx >= VHOST_MAX_VRING)
523 vq = dev->virtqueue[vring_idx];
527 vhost_log_used_vring(dev, vq, offset, len);
531 rte_vhost_rx_queue_count(int vid, uint16_t qid)
533 struct virtio_net *dev;
534 struct vhost_virtqueue *vq;
536 dev = get_device(vid);
540 if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
541 RTE_LOG(ERR, VHOST_DATA, "(%d) %s: invalid virtqueue idx %d.\n",
542 dev->vid, __func__, qid);
546 vq = dev->virtqueue[qid];
550 if (unlikely(vq->enabled == 0 || vq->avail == NULL))
553 return *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;