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34 #include <linux/vhost.h>
35 #include <linux/virtio_net.h>
42 #ifdef RTE_LIBRTE_VHOST_NUMA
46 #include <sys/socket.h>
48 #include <rte_ethdev.h>
50 #include <rte_string_fns.h>
51 #include <rte_memory.h>
52 #include <rte_malloc.h>
53 #include <rte_virtio_net.h>
55 #include "vhost-net.h"
56 #include "virtio-net.h"
59 * Device linked list structure for configuration.
61 struct virtio_net_config_ll {
62 struct virtio_net dev; /* Virtio device.*/
63 struct virtio_net_config_ll *next; /* Next dev on linked list.*/
66 /* device ops to add/remove device to/from data core. */
67 struct virtio_net_device_ops const *notify_ops;
68 /* root address of the linked list of managed virtio devices */
69 static struct virtio_net_config_ll *ll_root;
71 #define VHOST_USER_F_PROTOCOL_FEATURES 30
73 /* Features supported by this lib. */
74 #define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
75 (1ULL << VIRTIO_NET_F_CTRL_VQ) | \
76 (1ULL << VIRTIO_NET_F_CTRL_RX) | \
77 (VHOST_SUPPORTS_MQ) | \
78 (1ULL << VIRTIO_F_VERSION_1) | \
79 (1ULL << VHOST_F_LOG_ALL) | \
80 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))
81 static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
85 * Converts QEMU virtual address to Vhost virtual address. This function is
86 * used to convert the ring addresses to our address space.
89 qva_to_vva(struct virtio_net *dev, uint64_t qemu_va)
91 struct virtio_memory_regions *region;
92 uint64_t vhost_va = 0;
93 uint32_t regionidx = 0;
95 /* Find the region where the address lives. */
96 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
97 region = &dev->mem->regions[regionidx];
98 if ((qemu_va >= region->userspace_address) &&
99 (qemu_va <= region->userspace_address +
100 region->memory_size)) {
101 vhost_va = qemu_va + region->guest_phys_address +
102 region->address_offset -
103 region->userspace_address;
112 * Retrieves an entry from the devices configuration linked list.
114 static struct virtio_net_config_ll *
115 get_config_ll_entry(struct vhost_device_ctx ctx)
117 struct virtio_net_config_ll *ll_dev = ll_root;
119 /* Loop through linked list until the device_fh is found. */
120 while (ll_dev != NULL) {
121 if (ll_dev->dev.device_fh == ctx.fh)
123 ll_dev = ll_dev->next;
130 * Searches the configuration core linked list and
131 * retrieves the device if it exists.
134 get_device(struct vhost_device_ctx ctx)
136 struct virtio_net_config_ll *ll_dev;
138 ll_dev = get_config_ll_entry(ctx);
143 RTE_LOG(ERR, VHOST_CONFIG,
144 "(%"PRIu64") Device not found in linked list.\n", ctx.fh);
149 * Add entry containing a device to the device configuration linked list.
152 add_config_ll_entry(struct virtio_net_config_ll *new_ll_dev)
154 struct virtio_net_config_ll *ll_dev = ll_root;
156 /* If ll_dev == NULL then this is the first device so go to else */
158 /* If the 1st device_fh != 0 then we insert our device here. */
159 if (ll_dev->dev.device_fh != 0) {
160 new_ll_dev->dev.device_fh = 0;
161 new_ll_dev->next = ll_dev;
162 ll_root = new_ll_dev;
165 * Increment through the ll until we find un unused
166 * device_fh. Insert the device at that entry.
168 while ((ll_dev->next != NULL) &&
169 (ll_dev->dev.device_fh ==
170 (ll_dev->next->dev.device_fh - 1)))
171 ll_dev = ll_dev->next;
173 new_ll_dev->dev.device_fh = ll_dev->dev.device_fh + 1;
174 new_ll_dev->next = ll_dev->next;
175 ll_dev->next = new_ll_dev;
178 ll_root = new_ll_dev;
179 ll_root->dev.device_fh = 0;
185 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
187 if ((vq->callfd >= 0) && (destroy != 0))
194 * Unmap any memory, close any file descriptors and
195 * free any memory owned by a device.
198 cleanup_device(struct virtio_net *dev, int destroy)
202 /* Unmap QEMU memory file if mapped. */
204 munmap((void *)(uintptr_t)dev->mem->mapped_address,
205 (size_t)dev->mem->mapped_size);
210 for (i = 0; i < dev->virt_qp_nb; i++) {
211 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ], destroy);
212 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ], destroy);
217 * Release virtqueues and device memory.
220 free_device(struct virtio_net_config_ll *ll_dev)
224 for (i = 0; i < ll_dev->dev.virt_qp_nb; i++)
225 rte_free(ll_dev->dev.virtqueue[i * VIRTIO_QNUM]);
231 * Remove an entry from the device configuration linked list.
233 static struct virtio_net_config_ll *
234 rm_config_ll_entry(struct virtio_net_config_ll *ll_dev,
235 struct virtio_net_config_ll *ll_dev_last)
237 /* First remove the device and then clean it up. */
238 if (ll_dev == ll_root) {
239 ll_root = ll_dev->next;
240 cleanup_device(&ll_dev->dev, 1);
244 if (likely(ll_dev_last != NULL)) {
245 ll_dev_last->next = ll_dev->next;
246 cleanup_device(&ll_dev->dev, 1);
248 return ll_dev_last->next;
250 cleanup_device(&ll_dev->dev, 1);
252 RTE_LOG(ERR, VHOST_CONFIG,
253 "Remove entry from config_ll failed\n");
260 init_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
262 memset(vq, 0, sizeof(struct vhost_virtqueue));
267 /* Backends are set to -1 indicating an inactive device. */
270 /* always set the default vq pair to enabled */
276 init_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
278 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
280 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
281 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
285 reset_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
290 init_vring_queue(vq, qp_idx);
295 reset_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
297 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
299 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
300 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
304 alloc_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
306 struct vhost_virtqueue *virtqueue = NULL;
307 uint32_t virt_rx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_RXQ;
308 uint32_t virt_tx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_TXQ;
310 virtqueue = rte_malloc(NULL,
311 sizeof(struct vhost_virtqueue) * VIRTIO_QNUM, 0);
312 if (virtqueue == NULL) {
313 RTE_LOG(ERR, VHOST_CONFIG,
314 "Failed to allocate memory for virt qp:%d.\n", qp_idx);
318 dev->virtqueue[virt_rx_q_idx] = virtqueue;
319 dev->virtqueue[virt_tx_q_idx] = virtqueue + VIRTIO_TXQ;
321 init_vring_queue_pair(dev, qp_idx);
323 dev->virt_qp_nb += 1;
329 * Reset some variables in device structure, while keeping few
330 * others untouched, such as device_fh, ifname, virt_qp_nb: they
331 * should be same unless the device is removed.
334 reset_device(struct virtio_net *dev)
339 dev->protocol_features = 0;
342 for (i = 0; i < dev->virt_qp_nb; i++)
343 reset_vring_queue_pair(dev, i);
347 * Function is called from the CUSE open function. The device structure is
348 * initialised and a new entry is added to the device configuration linked
352 new_device(struct vhost_device_ctx ctx)
354 struct virtio_net_config_ll *new_ll_dev;
356 /* Setup device and virtqueues. */
357 new_ll_dev = rte_zmalloc(NULL, sizeof(struct virtio_net_config_ll), 0);
358 if (new_ll_dev == NULL) {
359 RTE_LOG(ERR, VHOST_CONFIG,
360 "(%"PRIu64") Failed to allocate memory for dev.\n",
365 new_ll_dev->next = NULL;
367 /* Add entry to device configuration linked list. */
368 add_config_ll_entry(new_ll_dev);
370 return new_ll_dev->dev.device_fh;
374 * Function is called from the CUSE release function. This function will
375 * cleanup the device and remove it from device configuration linked list.
378 destroy_device(struct vhost_device_ctx ctx)
380 struct virtio_net_config_ll *ll_dev_cur_ctx, *ll_dev_last = NULL;
381 struct virtio_net_config_ll *ll_dev_cur = ll_root;
383 /* Find the linked list entry for the device to be removed. */
384 ll_dev_cur_ctx = get_config_ll_entry(ctx);
385 while (ll_dev_cur != NULL) {
387 * If the device is found or
388 * a device that doesn't exist is found then it is removed.
390 if (ll_dev_cur == ll_dev_cur_ctx) {
392 * If the device is running on a data core then call
393 * the function to remove it from the data core.
395 if ((ll_dev_cur->dev.flags & VIRTIO_DEV_RUNNING))
396 notify_ops->destroy_device(&(ll_dev_cur->dev));
397 ll_dev_cur = rm_config_ll_entry(ll_dev_cur,
400 ll_dev_last = ll_dev_cur;
401 ll_dev_cur = ll_dev_cur->next;
407 set_ifname(struct vhost_device_ctx ctx,
408 const char *if_name, unsigned int if_len)
410 struct virtio_net *dev;
413 dev = get_device(ctx);
417 len = if_len > sizeof(dev->ifname) ?
418 sizeof(dev->ifname) : if_len;
420 strncpy(dev->ifname, if_name, len);
425 * Called from CUSE IOCTL: VHOST_SET_OWNER
426 * This function just returns success at the moment unless
427 * the device hasn't been initialised.
430 set_owner(struct vhost_device_ctx ctx)
432 struct virtio_net *dev;
434 dev = get_device(ctx);
442 * Called from CUSE IOCTL: VHOST_RESET_OWNER
445 reset_owner(struct vhost_device_ctx ctx)
447 struct virtio_net *dev;
449 dev = get_device(ctx);
453 if (dev->flags & VIRTIO_DEV_RUNNING)
454 notify_ops->destroy_device(dev);
456 cleanup_device(dev, 0);
462 * Called from CUSE IOCTL: VHOST_GET_FEATURES
463 * The features that we support are requested.
466 get_features(struct vhost_device_ctx ctx, uint64_t *pu)
468 struct virtio_net *dev;
470 dev = get_device(ctx);
474 /* Send our supported features. */
475 *pu = VHOST_FEATURES;
480 * Called from CUSE IOCTL: VHOST_SET_FEATURES
481 * We receive the negotiated features supported by us and the virtio device.
484 set_features(struct vhost_device_ctx ctx, uint64_t *pu)
486 struct virtio_net *dev;
490 dev = get_device(ctx);
493 if (*pu & ~VHOST_FEATURES)
498 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
499 vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
501 vhost_hlen = sizeof(struct virtio_net_hdr);
503 LOG_DEBUG(VHOST_CONFIG,
504 "(%"PRIu64") Mergeable RX buffers %s, virtio 1 %s\n",
506 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
507 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
509 for (i = 0; i < dev->virt_qp_nb; i++) {
510 uint16_t base_idx = i * VIRTIO_QNUM;
512 dev->virtqueue[base_idx + VIRTIO_RXQ]->vhost_hlen = vhost_hlen;
513 dev->virtqueue[base_idx + VIRTIO_TXQ]->vhost_hlen = vhost_hlen;
520 * Called from CUSE IOCTL: VHOST_SET_VRING_NUM
521 * The virtio device sends us the size of the descriptor ring.
524 set_vring_num(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
526 struct virtio_net *dev;
528 dev = get_device(ctx);
532 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
533 dev->virtqueue[state->index]->size = state->num;
539 * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
540 * same numa node as the memory of vring descriptor.
542 #ifdef RTE_LIBRTE_VHOST_NUMA
543 static struct virtio_net*
544 numa_realloc(struct virtio_net *dev, int index)
546 int oldnode, newnode;
547 struct virtio_net_config_ll *old_ll_dev, *new_ll_dev = NULL;
548 struct vhost_virtqueue *old_vq, *new_vq = NULL;
550 int realloc_dev = 0, realloc_vq = 0;
552 old_ll_dev = (struct virtio_net_config_ll *)dev;
553 old_vq = dev->virtqueue[index];
555 ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
556 MPOL_F_NODE | MPOL_F_ADDR);
557 ret = ret | get_mempolicy(&oldnode, NULL, 0, old_ll_dev,
558 MPOL_F_NODE | MPOL_F_ADDR);
560 RTE_LOG(ERR, VHOST_CONFIG,
561 "Unable to get vring desc or dev numa information.\n");
564 if (oldnode != newnode)
567 ret = get_mempolicy(&oldnode, NULL, 0, old_vq,
568 MPOL_F_NODE | MPOL_F_ADDR);
570 RTE_LOG(ERR, VHOST_CONFIG,
571 "Unable to get vq numa information.\n");
574 if (oldnode != newnode)
577 if (realloc_dev == 0 && realloc_vq == 0)
581 new_ll_dev = rte_malloc_socket(NULL,
582 sizeof(struct virtio_net_config_ll), 0, newnode);
584 new_vq = rte_malloc_socket(NULL,
585 sizeof(struct vhost_virtqueue), 0, newnode);
586 if (!new_ll_dev && !new_vq)
590 memcpy(new_vq, old_vq, sizeof(*new_vq));
592 memcpy(new_ll_dev, old_ll_dev, sizeof(*new_ll_dev));
593 (new_ll_dev ? new_ll_dev : old_ll_dev)->dev.virtqueue[index] =
594 new_vq ? new_vq : old_vq;
598 if (ll_root == old_ll_dev)
599 ll_root = new_ll_dev;
601 struct virtio_net_config_ll *prev = ll_root;
602 while (prev->next != old_ll_dev)
604 prev->next = new_ll_dev;
605 new_ll_dev->next = old_ll_dev->next;
607 rte_free(old_ll_dev);
610 return realloc_dev ? &new_ll_dev->dev : dev;
613 static struct virtio_net*
614 numa_realloc(struct virtio_net *dev, int index __rte_unused)
621 * Called from CUSE IOCTL: VHOST_SET_VRING_ADDR
622 * The virtio device sends us the desc, used and avail ring addresses.
623 * This function then converts these to our address space.
626 set_vring_addr(struct vhost_device_ctx ctx, struct vhost_vring_addr *addr)
628 struct virtio_net *dev;
629 struct vhost_virtqueue *vq;
631 dev = get_device(ctx);
635 /* addr->index refers to the queue index. The txq 1, rxq is 0. */
636 vq = dev->virtqueue[addr->index];
638 /* The addresses are converted from QEMU virtual to Vhost virtual. */
639 vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
640 addr->desc_user_addr);
642 RTE_LOG(ERR, VHOST_CONFIG,
643 "(%"PRIu64") Failed to find desc ring address.\n",
648 dev = numa_realloc(dev, addr->index);
649 vq = dev->virtqueue[addr->index];
651 vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
652 addr->avail_user_addr);
653 if (vq->avail == 0) {
654 RTE_LOG(ERR, VHOST_CONFIG,
655 "(%"PRIu64") Failed to find avail ring address.\n",
660 vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
661 addr->used_user_addr);
663 RTE_LOG(ERR, VHOST_CONFIG,
664 "(%"PRIu64") Failed to find used ring address.\n",
669 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address desc: %p\n",
670 dev->device_fh, vq->desc);
671 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address avail: %p\n",
672 dev->device_fh, vq->avail);
673 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address used: %p\n",
674 dev->device_fh, vq->used);
680 * Called from CUSE IOCTL: VHOST_SET_VRING_BASE
681 * The virtio device sends us the available ring last used index.
684 set_vring_base(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
686 struct virtio_net *dev;
688 dev = get_device(ctx);
692 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
693 dev->virtqueue[state->index]->last_used_idx = state->num;
694 dev->virtqueue[state->index]->last_used_idx_res = state->num;
700 * Called from CUSE IOCTL: VHOST_GET_VRING_BASE
701 * We send the virtio device our available ring last used index.
704 get_vring_base(struct vhost_device_ctx ctx, uint32_t index,
705 struct vhost_vring_state *state)
707 struct virtio_net *dev;
709 dev = get_device(ctx);
713 state->index = index;
714 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
715 state->num = dev->virtqueue[state->index]->last_used_idx;
722 * Called from CUSE IOCTL: VHOST_SET_VRING_CALL
723 * The virtio device sends an eventfd to interrupt the guest. This fd gets
724 * copied into our process space.
727 set_vring_call(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
729 struct virtio_net *dev;
730 struct vhost_virtqueue *vq;
731 uint32_t cur_qp_idx = file->index / VIRTIO_QNUM;
733 dev = get_device(ctx);
738 * FIXME: VHOST_SET_VRING_CALL is the first per-vring message
739 * we get, so we do vring queue pair allocation here.
741 if (cur_qp_idx + 1 > dev->virt_qp_nb) {
742 if (alloc_vring_queue_pair(dev, cur_qp_idx) < 0)
746 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
747 vq = dev->virtqueue[file->index];
753 vq->callfd = file->fd;
759 * Called from CUSE IOCTL: VHOST_SET_VRING_KICK
760 * The virtio device sends an eventfd that it can use to notify us.
761 * This fd gets copied into our process space.
764 set_vring_kick(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
766 struct virtio_net *dev;
767 struct vhost_virtqueue *vq;
769 dev = get_device(ctx);
773 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
774 vq = dev->virtqueue[file->index];
779 vq->kickfd = file->fd;
785 * Called from CUSE IOCTL: VHOST_NET_SET_BACKEND
786 * To complete device initialisation when the virtio driver is loaded,
787 * we are provided with a valid fd for a tap device (not used by us).
788 * If this happens then we can add the device to a data core.
789 * When the virtio driver is removed we get fd=-1.
790 * At that point we remove the device from the data core.
791 * The device will still exist in the device configuration linked list.
794 set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
796 struct virtio_net *dev;
798 dev = get_device(ctx);
802 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
803 dev->virtqueue[file->index]->backend = file->fd;
806 * If the device isn't already running and both backend fds are set,
809 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
810 if (((int)dev->virtqueue[VIRTIO_TXQ]->backend != VIRTIO_DEV_STOPPED) &&
811 ((int)dev->virtqueue[VIRTIO_RXQ]->backend != VIRTIO_DEV_STOPPED)) {
812 return notify_ops->new_device(dev);
814 /* Otherwise we remove it. */
816 if (file->fd == VIRTIO_DEV_STOPPED)
817 notify_ops->destroy_device(dev);
822 * Function pointers are set for the device operations to allow CUSE to call
823 * functions when an IOCTL, device_add or device_release is received.
825 static const struct vhost_net_device_ops vhost_device_ops = {
826 .new_device = new_device,
827 .destroy_device = destroy_device,
829 .set_ifname = set_ifname,
831 .get_features = get_features,
832 .set_features = set_features,
834 .set_vring_num = set_vring_num,
835 .set_vring_addr = set_vring_addr,
836 .set_vring_base = set_vring_base,
837 .get_vring_base = get_vring_base,
839 .set_vring_kick = set_vring_kick,
840 .set_vring_call = set_vring_call,
842 .set_backend = set_backend,
844 .set_owner = set_owner,
845 .reset_owner = reset_owner,
849 * Called by main to setup callbacks when registering CUSE device.
851 struct vhost_net_device_ops const *
852 get_virtio_net_callbacks(void)
854 return &vhost_device_ops;
857 int rte_vhost_enable_guest_notification(struct virtio_net *dev,
858 uint16_t queue_id, int enable)
861 RTE_LOG(ERR, VHOST_CONFIG,
862 "guest notification isn't supported.\n");
866 dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
870 uint64_t rte_vhost_feature_get(void)
872 return VHOST_FEATURES;
875 int rte_vhost_feature_disable(uint64_t feature_mask)
877 VHOST_FEATURES = VHOST_FEATURES & ~feature_mask;
881 int rte_vhost_feature_enable(uint64_t feature_mask)
883 if ((feature_mask & VHOST_SUPPORTED_FEATURES) == feature_mask) {
884 VHOST_FEATURES = VHOST_FEATURES | feature_mask;
891 * Register ops so that we can add/remove device to data core.
894 rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const ops)