4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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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 (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
78 (VHOST_SUPPORTS_MQ) | \
79 (1ULL << VIRTIO_F_VERSION_1) | \
80 (1ULL << VHOST_F_LOG_ALL) | \
81 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
82 (1ULL << VIRTIO_NET_F_HOST_TSO4) | \
83 (1ULL << VIRTIO_NET_F_HOST_TSO6) | \
84 (1ULL << VIRTIO_NET_F_CSUM) | \
85 (1ULL << VIRTIO_NET_F_GUEST_CSUM) | \
86 (1ULL << VIRTIO_NET_F_GUEST_TSO4) | \
87 (1ULL << VIRTIO_NET_F_GUEST_TSO6))
89 static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
93 * Converts QEMU virtual address to Vhost virtual address. This function is
94 * used to convert the ring addresses to our address space.
97 qva_to_vva(struct virtio_net *dev, uint64_t qemu_va)
99 struct virtio_memory_regions *region;
100 uint64_t vhost_va = 0;
101 uint32_t regionidx = 0;
103 /* Find the region where the address lives. */
104 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
105 region = &dev->mem->regions[regionidx];
106 if ((qemu_va >= region->userspace_address) &&
107 (qemu_va <= region->userspace_address +
108 region->memory_size)) {
109 vhost_va = qemu_va + region->guest_phys_address +
110 region->address_offset -
111 region->userspace_address;
120 * Retrieves an entry from the devices configuration linked list.
122 static struct virtio_net_config_ll *
123 get_config_ll_entry(struct vhost_device_ctx ctx)
125 struct virtio_net_config_ll *ll_dev = ll_root;
127 /* Loop through linked list until the device_fh is found. */
128 while (ll_dev != NULL) {
129 if (ll_dev->dev.device_fh == ctx.fh)
131 ll_dev = ll_dev->next;
138 * Searches the configuration core linked list and
139 * retrieves the device if it exists.
142 get_device(struct vhost_device_ctx ctx)
144 struct virtio_net_config_ll *ll_dev;
146 ll_dev = get_config_ll_entry(ctx);
151 RTE_LOG(ERR, VHOST_CONFIG,
152 "(%"PRIu64") Device not found in linked list.\n", ctx.fh);
157 * Add entry containing a device to the device configuration linked list.
160 add_config_ll_entry(struct virtio_net_config_ll *new_ll_dev)
162 struct virtio_net_config_ll *ll_dev = ll_root;
164 /* If ll_dev == NULL then this is the first device so go to else */
166 /* If the 1st device_fh != 0 then we insert our device here. */
167 if (ll_dev->dev.device_fh != 0) {
168 new_ll_dev->dev.device_fh = 0;
169 new_ll_dev->next = ll_dev;
170 ll_root = new_ll_dev;
173 * Increment through the ll until we find un unused
174 * device_fh. Insert the device at that entry.
176 while ((ll_dev->next != NULL) &&
177 (ll_dev->dev.device_fh ==
178 (ll_dev->next->dev.device_fh - 1)))
179 ll_dev = ll_dev->next;
181 new_ll_dev->dev.device_fh = ll_dev->dev.device_fh + 1;
182 new_ll_dev->next = ll_dev->next;
183 ll_dev->next = new_ll_dev;
186 ll_root = new_ll_dev;
187 ll_root->dev.device_fh = 0;
193 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
195 if ((vq->callfd >= 0) && (destroy != 0))
202 * Unmap any memory, close any file descriptors and
203 * free any memory owned by a device.
206 cleanup_device(struct virtio_net *dev, int destroy)
210 /* Unmap QEMU memory file if mapped. */
212 munmap((void *)(uintptr_t)dev->mem->mapped_address,
213 (size_t)dev->mem->mapped_size);
218 for (i = 0; i < dev->virt_qp_nb; i++) {
219 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_RXQ], destroy);
220 cleanup_vq(dev->virtqueue[i * VIRTIO_QNUM + VIRTIO_TXQ], destroy);
225 * Release virtqueues and device memory.
228 free_device(struct virtio_net_config_ll *ll_dev)
232 for (i = 0; i < ll_dev->dev.virt_qp_nb; i++)
233 rte_free(ll_dev->dev.virtqueue[i * VIRTIO_QNUM]);
239 * Remove an entry from the device configuration linked list.
241 static struct virtio_net_config_ll *
242 rm_config_ll_entry(struct virtio_net_config_ll *ll_dev,
243 struct virtio_net_config_ll *ll_dev_last)
245 /* First remove the device and then clean it up. */
246 if (ll_dev == ll_root) {
247 ll_root = ll_dev->next;
248 cleanup_device(&ll_dev->dev, 1);
252 if (likely(ll_dev_last != NULL)) {
253 ll_dev_last->next = ll_dev->next;
254 cleanup_device(&ll_dev->dev, 1);
256 return ll_dev_last->next;
258 cleanup_device(&ll_dev->dev, 1);
260 RTE_LOG(ERR, VHOST_CONFIG,
261 "Remove entry from config_ll failed\n");
268 init_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
270 memset(vq, 0, sizeof(struct vhost_virtqueue));
275 /* Backends are set to -1 indicating an inactive device. */
278 /* always set the default vq pair to enabled */
284 init_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
286 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
288 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
289 init_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
293 reset_vring_queue(struct vhost_virtqueue *vq, int qp_idx)
298 init_vring_queue(vq, qp_idx);
303 reset_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
305 uint32_t base_idx = qp_idx * VIRTIO_QNUM;
307 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_RXQ], qp_idx);
308 reset_vring_queue(dev->virtqueue[base_idx + VIRTIO_TXQ], qp_idx);
312 alloc_vring_queue_pair(struct virtio_net *dev, uint32_t qp_idx)
314 struct vhost_virtqueue *virtqueue = NULL;
315 uint32_t virt_rx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_RXQ;
316 uint32_t virt_tx_q_idx = qp_idx * VIRTIO_QNUM + VIRTIO_TXQ;
318 virtqueue = rte_malloc(NULL,
319 sizeof(struct vhost_virtqueue) * VIRTIO_QNUM, 0);
320 if (virtqueue == NULL) {
321 RTE_LOG(ERR, VHOST_CONFIG,
322 "Failed to allocate memory for virt qp:%d.\n", qp_idx);
326 dev->virtqueue[virt_rx_q_idx] = virtqueue;
327 dev->virtqueue[virt_tx_q_idx] = virtqueue + VIRTIO_TXQ;
329 init_vring_queue_pair(dev, qp_idx);
331 dev->virt_qp_nb += 1;
337 * Reset some variables in device structure, while keeping few
338 * others untouched, such as device_fh, ifname, virt_qp_nb: they
339 * should be same unless the device is removed.
342 reset_device(struct virtio_net *dev)
347 dev->protocol_features = 0;
350 for (i = 0; i < dev->virt_qp_nb; i++)
351 reset_vring_queue_pair(dev, i);
355 * Function is called from the CUSE open function. The device structure is
356 * initialised and a new entry is added to the device configuration linked
360 new_device(struct vhost_device_ctx ctx)
362 struct virtio_net_config_ll *new_ll_dev;
364 /* Setup device and virtqueues. */
365 new_ll_dev = rte_zmalloc(NULL, sizeof(struct virtio_net_config_ll), 0);
366 if (new_ll_dev == NULL) {
367 RTE_LOG(ERR, VHOST_CONFIG,
368 "(%"PRIu64") Failed to allocate memory for dev.\n",
373 new_ll_dev->next = NULL;
375 /* Add entry to device configuration linked list. */
376 add_config_ll_entry(new_ll_dev);
378 return new_ll_dev->dev.device_fh;
382 * Function is called from the CUSE release function. This function will
383 * cleanup the device and remove it from device configuration linked list.
386 destroy_device(struct vhost_device_ctx ctx)
388 struct virtio_net_config_ll *ll_dev_cur_ctx, *ll_dev_last = NULL;
389 struct virtio_net_config_ll *ll_dev_cur = ll_root;
391 /* Find the linked list entry for the device to be removed. */
392 ll_dev_cur_ctx = get_config_ll_entry(ctx);
393 while (ll_dev_cur != NULL) {
395 * If the device is found or
396 * a device that doesn't exist is found then it is removed.
398 if (ll_dev_cur == ll_dev_cur_ctx) {
400 * If the device is running on a data core then call
401 * the function to remove it from the data core.
403 if ((ll_dev_cur->dev.flags & VIRTIO_DEV_RUNNING))
404 notify_ops->destroy_device(&(ll_dev_cur->dev));
405 ll_dev_cur = rm_config_ll_entry(ll_dev_cur,
408 ll_dev_last = ll_dev_cur;
409 ll_dev_cur = ll_dev_cur->next;
415 set_ifname(struct vhost_device_ctx ctx,
416 const char *if_name, unsigned int if_len)
418 struct virtio_net *dev;
421 dev = get_device(ctx);
425 len = if_len > sizeof(dev->ifname) ?
426 sizeof(dev->ifname) : if_len;
428 strncpy(dev->ifname, if_name, len);
433 * Called from CUSE IOCTL: VHOST_SET_OWNER
434 * This function just returns success at the moment unless
435 * the device hasn't been initialised.
438 set_owner(struct vhost_device_ctx ctx)
440 struct virtio_net *dev;
442 dev = get_device(ctx);
450 * Called from CUSE IOCTL: VHOST_RESET_OWNER
453 reset_owner(struct vhost_device_ctx ctx)
455 struct virtio_net *dev;
457 dev = get_device(ctx);
461 if (dev->flags & VIRTIO_DEV_RUNNING)
462 notify_ops->destroy_device(dev);
464 cleanup_device(dev, 0);
470 * Called from CUSE IOCTL: VHOST_GET_FEATURES
471 * The features that we support are requested.
474 get_features(struct vhost_device_ctx ctx, uint64_t *pu)
476 struct virtio_net *dev;
478 dev = get_device(ctx);
482 /* Send our supported features. */
483 *pu = VHOST_FEATURES;
488 * Called from CUSE IOCTL: VHOST_SET_FEATURES
489 * We receive the negotiated features supported by us and the virtio device.
492 set_features(struct vhost_device_ctx ctx, uint64_t *pu)
494 struct virtio_net *dev;
498 dev = get_device(ctx);
501 if (*pu & ~VHOST_FEATURES)
506 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
507 vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
509 vhost_hlen = sizeof(struct virtio_net_hdr);
511 LOG_DEBUG(VHOST_CONFIG,
512 "(%"PRIu64") Mergeable RX buffers %s, virtio 1 %s\n",
514 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
515 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
517 for (i = 0; i < dev->virt_qp_nb; i++) {
518 uint16_t base_idx = i * VIRTIO_QNUM;
520 dev->virtqueue[base_idx + VIRTIO_RXQ]->vhost_hlen = vhost_hlen;
521 dev->virtqueue[base_idx + VIRTIO_TXQ]->vhost_hlen = vhost_hlen;
528 * Called from CUSE IOCTL: VHOST_SET_VRING_NUM
529 * The virtio device sends us the size of the descriptor ring.
532 set_vring_num(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
534 struct virtio_net *dev;
536 dev = get_device(ctx);
540 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
541 dev->virtqueue[state->index]->size = state->num;
547 * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
548 * same numa node as the memory of vring descriptor.
550 #ifdef RTE_LIBRTE_VHOST_NUMA
551 static struct virtio_net*
552 numa_realloc(struct virtio_net *dev, int index)
554 int oldnode, newnode;
555 struct virtio_net_config_ll *old_ll_dev, *new_ll_dev = NULL;
556 struct vhost_virtqueue *old_vq, *new_vq = NULL;
558 int realloc_dev = 0, realloc_vq = 0;
560 old_ll_dev = (struct virtio_net_config_ll *)dev;
561 old_vq = dev->virtqueue[index];
563 ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
564 MPOL_F_NODE | MPOL_F_ADDR);
565 ret = ret | get_mempolicy(&oldnode, NULL, 0, old_ll_dev,
566 MPOL_F_NODE | MPOL_F_ADDR);
568 RTE_LOG(ERR, VHOST_CONFIG,
569 "Unable to get vring desc or dev numa information.\n");
572 if (oldnode != newnode)
575 ret = get_mempolicy(&oldnode, NULL, 0, old_vq,
576 MPOL_F_NODE | MPOL_F_ADDR);
578 RTE_LOG(ERR, VHOST_CONFIG,
579 "Unable to get vq numa information.\n");
582 if (oldnode != newnode)
585 if (realloc_dev == 0 && realloc_vq == 0)
589 new_ll_dev = rte_malloc_socket(NULL,
590 sizeof(struct virtio_net_config_ll), 0, newnode);
592 new_vq = rte_malloc_socket(NULL,
593 sizeof(struct vhost_virtqueue), 0, newnode);
594 if (!new_ll_dev && !new_vq)
598 memcpy(new_vq, old_vq, sizeof(*new_vq));
600 memcpy(new_ll_dev, old_ll_dev, sizeof(*new_ll_dev));
601 (new_ll_dev ? new_ll_dev : old_ll_dev)->dev.virtqueue[index] =
602 new_vq ? new_vq : old_vq;
606 if (ll_root == old_ll_dev)
607 ll_root = new_ll_dev;
609 struct virtio_net_config_ll *prev = ll_root;
610 while (prev->next != old_ll_dev)
612 prev->next = new_ll_dev;
613 new_ll_dev->next = old_ll_dev->next;
615 rte_free(old_ll_dev);
618 return realloc_dev ? &new_ll_dev->dev : dev;
621 static struct virtio_net*
622 numa_realloc(struct virtio_net *dev, int index __rte_unused)
629 * Called from CUSE IOCTL: VHOST_SET_VRING_ADDR
630 * The virtio device sends us the desc, used and avail ring addresses.
631 * This function then converts these to our address space.
634 set_vring_addr(struct vhost_device_ctx ctx, struct vhost_vring_addr *addr)
636 struct virtio_net *dev;
637 struct vhost_virtqueue *vq;
639 dev = get_device(ctx);
643 /* addr->index refers to the queue index. The txq 1, rxq is 0. */
644 vq = dev->virtqueue[addr->index];
646 /* The addresses are converted from QEMU virtual to Vhost virtual. */
647 vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev,
648 addr->desc_user_addr);
650 RTE_LOG(ERR, VHOST_CONFIG,
651 "(%"PRIu64") Failed to find desc ring address.\n",
656 dev = numa_realloc(dev, addr->index);
657 vq = dev->virtqueue[addr->index];
659 vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev,
660 addr->avail_user_addr);
661 if (vq->avail == 0) {
662 RTE_LOG(ERR, VHOST_CONFIG,
663 "(%"PRIu64") Failed to find avail ring address.\n",
668 vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev,
669 addr->used_user_addr);
671 RTE_LOG(ERR, VHOST_CONFIG,
672 "(%"PRIu64") Failed to find used ring address.\n",
677 vq->log_guest_addr = addr->log_guest_addr;
679 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address desc: %p\n",
680 dev->device_fh, vq->desc);
681 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address avail: %p\n",
682 dev->device_fh, vq->avail);
683 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address used: %p\n",
684 dev->device_fh, vq->used);
685 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") log_guest_addr: %"PRIx64"\n",
686 dev->device_fh, vq->log_guest_addr);
692 * Called from CUSE IOCTL: VHOST_SET_VRING_BASE
693 * The virtio device sends us the available ring last used index.
696 set_vring_base(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
698 struct virtio_net *dev;
700 dev = get_device(ctx);
704 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
705 dev->virtqueue[state->index]->last_used_idx = state->num;
706 dev->virtqueue[state->index]->last_used_idx_res = state->num;
712 * Called from CUSE IOCTL: VHOST_GET_VRING_BASE
713 * We send the virtio device our available ring last used index.
716 get_vring_base(struct vhost_device_ctx ctx, uint32_t index,
717 struct vhost_vring_state *state)
719 struct virtio_net *dev;
721 dev = get_device(ctx);
725 state->index = index;
726 /* State->index refers to the queue index. The txq is 1, rxq is 0. */
727 state->num = dev->virtqueue[state->index]->last_used_idx;
734 * Called from CUSE IOCTL: VHOST_SET_VRING_CALL
735 * The virtio device sends an eventfd to interrupt the guest. This fd gets
736 * copied into our process space.
739 set_vring_call(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
741 struct virtio_net *dev;
742 struct vhost_virtqueue *vq;
743 uint32_t cur_qp_idx = file->index / VIRTIO_QNUM;
745 dev = get_device(ctx);
750 * FIXME: VHOST_SET_VRING_CALL is the first per-vring message
751 * we get, so we do vring queue pair allocation here.
753 if (cur_qp_idx + 1 > dev->virt_qp_nb) {
754 if (alloc_vring_queue_pair(dev, cur_qp_idx) < 0)
758 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
759 vq = dev->virtqueue[file->index];
765 vq->callfd = file->fd;
771 * Called from CUSE IOCTL: VHOST_SET_VRING_KICK
772 * The virtio device sends an eventfd that it can use to notify us.
773 * This fd gets copied into our process space.
776 set_vring_kick(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
778 struct virtio_net *dev;
779 struct vhost_virtqueue *vq;
781 dev = get_device(ctx);
785 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
786 vq = dev->virtqueue[file->index];
791 vq->kickfd = file->fd;
797 * Called from CUSE IOCTL: VHOST_NET_SET_BACKEND
798 * To complete device initialisation when the virtio driver is loaded,
799 * we are provided with a valid fd for a tap device (not used by us).
800 * If this happens then we can add the device to a data core.
801 * When the virtio driver is removed we get fd=-1.
802 * At that point we remove the device from the data core.
803 * The device will still exist in the device configuration linked list.
806 set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
808 struct virtio_net *dev;
810 dev = get_device(ctx);
814 /* file->index refers to the queue index. The txq is 1, rxq is 0. */
815 dev->virtqueue[file->index]->backend = file->fd;
818 * If the device isn't already running and both backend fds are set,
821 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
822 if (((int)dev->virtqueue[VIRTIO_TXQ]->backend != VIRTIO_DEV_STOPPED) &&
823 ((int)dev->virtqueue[VIRTIO_RXQ]->backend != VIRTIO_DEV_STOPPED)) {
824 return notify_ops->new_device(dev);
826 /* Otherwise we remove it. */
828 if (file->fd == VIRTIO_DEV_STOPPED)
829 notify_ops->destroy_device(dev);
834 * Function pointers are set for the device operations to allow CUSE to call
835 * functions when an IOCTL, device_add or device_release is received.
837 static const struct vhost_net_device_ops vhost_device_ops = {
838 .new_device = new_device,
839 .destroy_device = destroy_device,
841 .set_ifname = set_ifname,
843 .get_features = get_features,
844 .set_features = set_features,
846 .set_vring_num = set_vring_num,
847 .set_vring_addr = set_vring_addr,
848 .set_vring_base = set_vring_base,
849 .get_vring_base = get_vring_base,
851 .set_vring_kick = set_vring_kick,
852 .set_vring_call = set_vring_call,
854 .set_backend = set_backend,
856 .set_owner = set_owner,
857 .reset_owner = reset_owner,
861 * Called by main to setup callbacks when registering CUSE device.
863 struct vhost_net_device_ops const *
864 get_virtio_net_callbacks(void)
866 return &vhost_device_ops;
869 int rte_vhost_enable_guest_notification(struct virtio_net *dev,
870 uint16_t queue_id, int enable)
873 RTE_LOG(ERR, VHOST_CONFIG,
874 "guest notification isn't supported.\n");
878 dev->virtqueue[queue_id]->used->flags = VRING_USED_F_NO_NOTIFY;
882 uint64_t rte_vhost_feature_get(void)
884 return VHOST_FEATURES;
887 int rte_vhost_feature_disable(uint64_t feature_mask)
889 VHOST_FEATURES = VHOST_FEATURES & ~feature_mask;
893 int rte_vhost_feature_enable(uint64_t feature_mask)
895 if ((feature_mask & VHOST_SUPPORTED_FEATURES) == feature_mask) {
896 VHOST_FEATURES = VHOST_FEATURES | feature_mask;
903 * Register ops so that we can add/remove device to data core.
906 rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const ops)