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35 #include <fuse/cuse_lowlevel.h>
36 #include <linux/vhost.h>
37 #include <linux/virtio_net.h>
41 #include <sys/eventfd.h>
42 #include <sys/ioctl.h>
46 #include <rte_ethdev.h>
48 #include <rte_string_fns.h>
49 #include <rte_memory.h>
50 #include <rte_virtio_net.h>
52 #include "vhost-net-cdev.h"
53 #include "eventfd_link/eventfd_link.h"
56 * Device linked list structure for configuration.
58 struct virtio_net_config_ll {
59 struct virtio_net dev; /* Virtio device.*/
60 struct virtio_net_config_ll *next; /* Next entry on linked list.*/
63 const char eventfd_cdev[] = "/dev/eventfd-link";
65 /* device ops to add/remove device to data core. */
66 static struct virtio_net_device_ops const *notify_ops;
67 /* Root address of the linked list in the configuration core. */
68 static struct virtio_net_config_ll *ll_root;
70 /* Features supported by this application. RX merge buffers are enabled by default. */
71 #define VHOST_SUPPORTED_FEATURES (1ULL << VIRTIO_NET_F_MRG_RXBUF)
72 static uint64_t VHOST_FEATURES = VHOST_SUPPORTED_FEATURES;
74 /* Line size for reading maps file. */
75 const uint32_t BUFSIZE = PATH_MAX;
77 /* Size of prot char array in procmap. */
80 /* Number of elements in procmap struct. */
83 /* Structure containing information gathered from maps file. */
85 uint64_t va_start; /* Start virtual address in file. */
86 uint64_t len; /* Size of file. */
87 uint64_t pgoff; /* Not used. */
88 uint32_t maj; /* Not used. */
89 uint32_t min; /* Not used. */
90 uint32_t ino; /* Not used. */
91 char prot[PROT_SZ]; /* Not used. */
92 char fname[PATH_MAX];/* File name. */
96 * Converts QEMU virtual address to Vhost virtual address. This function is used
97 * to convert the ring addresses to our address space.
100 qva_to_vva(struct virtio_net *dev, uint64_t qemu_va)
102 struct virtio_memory_regions *region;
103 uint64_t vhost_va = 0;
104 uint32_t regionidx = 0;
106 /* Find the region where the address lives. */
107 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
108 region = &dev->mem->regions[regionidx];
109 if ((qemu_va >= region->userspace_address) &&
110 (qemu_va <= region->userspace_address +
111 region->memory_size)) {
112 vhost_va = dev->mem->mapped_address + qemu_va -
113 dev->mem->base_address;
121 * Locate the file containing QEMU's memory space and map it to our address space.
124 host_memory_map(struct virtio_net *dev, struct virtio_memory *mem,
125 pid_t pid, uint64_t addr)
127 struct dirent *dptr = NULL;
128 struct procmap procmap;
132 char memfile[PATH_MAX];
133 char mapfile[PATH_MAX];
134 char procdir[PATH_MAX];
135 char resolved_path[PATH_MAX];
142 char *str, *sp, *in[PROCMAP_SZ];
145 /* Path where mem files are located. */
146 snprintf(procdir, PATH_MAX, "/proc/%u/fd/", pid);
147 /* Maps file used to locate mem file. */
148 snprintf(mapfile, PATH_MAX, "/proc/%u/maps", pid);
150 fmap = fopen(mapfile, "r");
152 RTE_LOG(ERR, VHOST_CONFIG,
153 "(%"PRIu64") Failed to open maps file for pid %d\n",
154 dev->device_fh, pid);
158 /* Read through maps file until we find out base_address. */
159 while (fgets(line, BUFSIZE, fmap) != 0) {
162 /* Split line in to fields. */
163 for (i = 0; i < PROCMAP_SZ; i++) {
164 in[i] = strtok_r(str, &dlm[i], &sp);
165 if ((in[i] == NULL) || (errno != 0)) {
172 /* Convert/Copy each field as needed. */
173 procmap.va_start = strtoull(in[0], &end, 16);
174 if ((in[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
179 procmap.len = strtoull(in[1], &end, 16);
180 if ((in[1] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
185 procmap.pgoff = strtoull(in[3], &end, 16);
186 if ((in[3] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
191 procmap.maj = strtoul(in[4], &end, 16);
192 if ((in[4] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
197 procmap.min = strtoul(in[5], &end, 16);
198 if ((in[5] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
203 procmap.ino = strtoul(in[6], &end, 16);
204 if ((in[6] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
209 memcpy(&procmap.prot, in[2], PROT_SZ);
210 memcpy(&procmap.fname, in[7], PATH_MAX);
212 if (procmap.va_start == addr) {
213 procmap.len = procmap.len - procmap.va_start;
221 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file in pid %d maps file\n", dev->device_fh, pid);
225 /* Find the guest memory file among the process fds. */
226 dp = opendir(procdir);
228 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Cannot open pid %d process directory\n", dev->device_fh, pid);
235 /* Read the fd directory contents. */
236 while (NULL != (dptr = readdir(dp))) {
237 snprintf(memfile, PATH_MAX, "/proc/%u/fd/%s",
239 path = realpath(memfile, resolved_path);
241 RTE_LOG(ERR, VHOST_CONFIG,
242 "(%"PRIu64") Failed to resolve fd directory\n",
247 if (strncmp(resolved_path, procmap.fname,
248 strnlen(procmap.fname, PATH_MAX)) == 0) {
257 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file for pid %d\n", dev->device_fh, pid);
260 /* Open the shared memory file and map the memory into this process. */
261 fd = open(memfile, O_RDWR);
264 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to open %s for pid %d\n", dev->device_fh, memfile, pid);
268 map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE ,
269 MAP_POPULATE|MAP_SHARED, fd, 0);
272 if (map == MAP_FAILED) {
273 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Error mapping the file %s for pid %d\n", dev->device_fh, memfile, pid);
277 /* Store the memory address and size in the device data structure */
278 mem->mapped_address = (uint64_t)(uintptr_t)map;
279 mem->mapped_size = procmap.len;
281 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mem File: %s->%s - Size: %llu - VA: %p\n", dev->device_fh,
282 memfile, resolved_path, (long long unsigned)mem->mapped_size, map);
288 * Retrieves an entry from the devices configuration linked list.
290 static struct virtio_net_config_ll *
291 get_config_ll_entry(struct vhost_device_ctx ctx)
293 struct virtio_net_config_ll *ll_dev = ll_root;
295 /* Loop through linked list until the device_fh is found. */
296 while (ll_dev != NULL) {
297 if (ll_dev->dev.device_fh == ctx.fh)
299 ll_dev = ll_dev->next;
306 * Searches the configuration core linked list and retrieves the device if it exists.
308 static struct virtio_net *
309 get_device(struct vhost_device_ctx ctx)
311 struct virtio_net_config_ll *ll_dev;
313 ll_dev = get_config_ll_entry(ctx);
315 /* If a matching entry is found in the linked list, return the device in that entry. */
319 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Device not found in linked list.\n", ctx.fh);
324 * Add entry containing a device to the device configuration linked list.
327 add_config_ll_entry(struct virtio_net_config_ll *new_ll_dev)
329 struct virtio_net_config_ll *ll_dev = ll_root;
331 /* If ll_dev == NULL then this is the first device so go to else */
333 /* If the 1st device_fh != 0 then we insert our device here. */
334 if (ll_dev->dev.device_fh != 0) {
335 new_ll_dev->dev.device_fh = 0;
336 new_ll_dev->next = ll_dev;
337 ll_root = new_ll_dev;
339 /* Increment through the ll until we find un unused device_fh. Insert the device at that entry*/
340 while ((ll_dev->next != NULL) && (ll_dev->dev.device_fh == (ll_dev->next->dev.device_fh - 1)))
341 ll_dev = ll_dev->next;
343 new_ll_dev->dev.device_fh = ll_dev->dev.device_fh + 1;
344 new_ll_dev->next = ll_dev->next;
345 ll_dev->next = new_ll_dev;
348 ll_root = new_ll_dev;
349 ll_root->dev.device_fh = 0;
355 * Unmap any memory, close any file descriptors and free any memory owned by a device.
358 cleanup_device(struct virtio_net *dev)
360 /* Unmap QEMU memory file if mapped. */
362 munmap((void *)(uintptr_t)dev->mem->mapped_address,
363 (size_t)dev->mem->mapped_size);
367 /* Close any event notifiers opened by device. */
368 if (dev->virtqueue[VIRTIO_RXQ]->callfd)
369 close((int)dev->virtqueue[VIRTIO_RXQ]->callfd);
370 if (dev->virtqueue[VIRTIO_RXQ]->kickfd)
371 close((int)dev->virtqueue[VIRTIO_RXQ]->kickfd);
372 if (dev->virtqueue[VIRTIO_TXQ]->callfd)
373 close((int)dev->virtqueue[VIRTIO_TXQ]->callfd);
374 if (dev->virtqueue[VIRTIO_TXQ]->kickfd)
375 close((int)dev->virtqueue[VIRTIO_TXQ]->kickfd);
379 * Release virtqueues and device memory.
382 free_device(struct virtio_net_config_ll *ll_dev)
384 /* Free any malloc'd memory */
385 free(ll_dev->dev.virtqueue[VIRTIO_RXQ]);
386 free(ll_dev->dev.virtqueue[VIRTIO_TXQ]);
390 * Remove an entry from the device configuration linked list.
392 static struct virtio_net_config_ll *
393 rm_config_ll_entry(struct virtio_net_config_ll *ll_dev,
394 struct virtio_net_config_ll *ll_dev_last)
396 /* First remove the device and then clean it up. */
397 if (ll_dev == ll_root) {
398 ll_root = ll_dev->next;
399 cleanup_device(&ll_dev->dev);
403 if (likely(ll_dev_last != NULL)) {
404 ll_dev_last->next = ll_dev->next;
405 cleanup_device(&ll_dev->dev);
407 return ll_dev_last->next;
409 cleanup_device(&ll_dev->dev);
411 RTE_LOG(ERR, VHOST_CONFIG,
412 "Remove entry from config_ll failed\n");
419 * Initialise all variables in device structure.
422 init_device(struct virtio_net *dev)
426 /* Virtqueues have already been malloced so we don't want to set them to NULL. */
427 vq_offset = offsetof(struct virtio_net, mem);
429 /* Set everything to 0. */
430 memset((void *)(uintptr_t)((uint64_t)(uintptr_t)dev + vq_offset), 0,
431 (sizeof(struct virtio_net) - (size_t)vq_offset));
432 memset(dev->virtqueue[VIRTIO_RXQ], 0, sizeof(struct vhost_virtqueue));
433 memset(dev->virtqueue[VIRTIO_TXQ], 0, sizeof(struct vhost_virtqueue));
435 /* Backends are set to -1 indicating an inactive device. */
436 dev->virtqueue[VIRTIO_RXQ]->backend = VIRTIO_DEV_STOPPED;
437 dev->virtqueue[VIRTIO_TXQ]->backend = VIRTIO_DEV_STOPPED;
441 * Function is called from the CUSE open function. The device structure is
442 * initialised and a new entry is added to the device configuration linked
446 new_device(struct vhost_device_ctx ctx)
448 struct virtio_net_config_ll *new_ll_dev;
449 struct vhost_virtqueue *virtqueue_rx, *virtqueue_tx;
451 /* Setup device and virtqueues. */
452 new_ll_dev = malloc(sizeof(struct virtio_net_config_ll));
453 if (new_ll_dev == NULL) {
454 RTE_LOG(ERR, VHOST_CONFIG,
455 "(%"PRIu64") Failed to allocate memory for dev.\n",
460 virtqueue_rx = malloc(sizeof(struct vhost_virtqueue));
461 if (virtqueue_rx == NULL) {
463 RTE_LOG(ERR, VHOST_CONFIG,
464 "(%"PRIu64") Failed to allocate memory for rxq.\n",
469 virtqueue_tx = malloc(sizeof(struct vhost_virtqueue));
470 if (virtqueue_tx == NULL) {
473 RTE_LOG(ERR, VHOST_CONFIG,
474 "(%"PRIu64") Failed to allocate memory for txq.\n",
479 new_ll_dev->dev.virtqueue[VIRTIO_RXQ] = virtqueue_rx;
480 new_ll_dev->dev.virtqueue[VIRTIO_TXQ] = virtqueue_tx;
482 /* Initialise device and virtqueues. */
483 init_device(&new_ll_dev->dev);
485 new_ll_dev->next = NULL;
487 /* Add entry to device configuration linked list. */
488 add_config_ll_entry(new_ll_dev);
490 return new_ll_dev->dev.device_fh;
494 * Function is called from the CUSE release function. This function will cleanup
495 * the device and remove it from device configuration linked list.
498 destroy_device(struct vhost_device_ctx ctx)
500 struct virtio_net_config_ll *ll_dev_cur_ctx, *ll_dev_last = NULL;
501 struct virtio_net_config_ll *ll_dev_cur = ll_root;
503 /* Find the linked list entry for the device to be removed. */
504 ll_dev_cur_ctx = get_config_ll_entry(ctx);
505 while (ll_dev_cur != NULL) {
506 /* If the device is found or a device that doesn't exist is found then it is removed. */
507 if (ll_dev_cur == ll_dev_cur_ctx) {
509 * If the device is running on a data core then call the function to remove it from
512 if ((ll_dev_cur->dev.flags & VIRTIO_DEV_RUNNING))
513 notify_ops->destroy_device(&(ll_dev_cur->dev));
514 ll_dev_cur = rm_config_ll_entry(ll_dev_cur, ll_dev_last);
516 ll_dev_last = ll_dev_cur;
517 ll_dev_cur = ll_dev_cur->next;
523 * Called from CUSE IOCTL: VHOST_SET_OWNER
524 * This function just returns success at the moment unless the device hasn't been initialised.
527 set_owner(struct vhost_device_ctx ctx)
529 struct virtio_net *dev;
531 dev = get_device(ctx);
539 * Called from CUSE IOCTL: VHOST_RESET_OWNER
542 reset_owner(struct vhost_device_ctx ctx)
544 struct virtio_net_config_ll *ll_dev;
546 ll_dev = get_config_ll_entry(ctx);
548 cleanup_device(&ll_dev->dev);
549 init_device(&ll_dev->dev);
555 * Called from CUSE IOCTL: VHOST_GET_FEATURES
556 * The features that we support are requested.
559 get_features(struct vhost_device_ctx ctx, uint64_t *pu)
561 struct virtio_net *dev;
563 dev = get_device(ctx);
567 /* Send our supported features. */
568 *pu = VHOST_FEATURES;
573 * Called from CUSE IOCTL: VHOST_SET_FEATURES
574 * We receive the negotiated set of features supported by us and the virtio device.
577 set_features(struct vhost_device_ctx ctx, uint64_t *pu)
579 struct virtio_net *dev;
581 dev = get_device(ctx);
584 if (*pu & ~VHOST_FEATURES)
587 /* Store the negotiated feature list for the device. */
590 /* Set the vhost_hlen depending on if VIRTIO_NET_F_MRG_RXBUF is set. */
591 if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
592 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mergeable RX buffers enabled\n", dev->device_fh);
593 dev->virtqueue[VIRTIO_RXQ]->vhost_hlen =
594 sizeof(struct virtio_net_hdr_mrg_rxbuf);
595 dev->virtqueue[VIRTIO_TXQ]->vhost_hlen =
596 sizeof(struct virtio_net_hdr_mrg_rxbuf);
598 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mergeable RX buffers disabled\n", dev->device_fh);
599 dev->virtqueue[VIRTIO_RXQ]->vhost_hlen =
600 sizeof(struct virtio_net_hdr);
601 dev->virtqueue[VIRTIO_TXQ]->vhost_hlen =
602 sizeof(struct virtio_net_hdr);
609 * Called from CUSE IOCTL: VHOST_SET_MEM_TABLE
610 * This function creates and populates the memory structure for the device. This includes
611 * storing offsets used to translate buffer addresses.
614 set_mem_table(struct vhost_device_ctx ctx, const void *mem_regions_addr,
617 struct virtio_net *dev;
618 struct vhost_memory_region *mem_regions;
619 struct virtio_memory *mem;
620 uint64_t size = offsetof(struct vhost_memory, regions);
621 uint32_t regionidx, valid_regions;
623 dev = get_device(ctx);
628 munmap((void *)(uintptr_t)dev->mem->mapped_address,
629 (size_t)dev->mem->mapped_size);
633 /* Malloc the memory structure depending on the number of regions. */
634 mem = calloc(1, sizeof(struct virtio_memory) +
635 (sizeof(struct virtio_memory_regions) * nregions));
637 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to allocate memory for dev->mem.\n", dev->device_fh);
641 mem->nregions = nregions;
643 mem_regions = (void *)(uintptr_t)
644 ((uint64_t)(uintptr_t)mem_regions_addr + size);
646 for (regionidx = 0; regionidx < mem->nregions; regionidx++) {
647 /* Populate the region structure for each region. */
648 mem->regions[regionidx].guest_phys_address =
649 mem_regions[regionidx].guest_phys_addr;
650 mem->regions[regionidx].guest_phys_address_end =
651 mem->regions[regionidx].guest_phys_address +
652 mem_regions[regionidx].memory_size;
653 mem->regions[regionidx].memory_size =
654 mem_regions[regionidx].memory_size;
655 mem->regions[regionidx].userspace_address =
656 mem_regions[regionidx].userspace_addr;
658 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") REGION: %u - GPA: %p - QEMU VA: %p - SIZE (%"PRIu64")\n", dev->device_fh,
659 regionidx, (void *)(uintptr_t)mem->regions[regionidx].guest_phys_address,
660 (void *)(uintptr_t)mem->regions[regionidx].userspace_address,
661 mem->regions[regionidx].memory_size);
663 /*set the base address mapping*/
664 if (mem->regions[regionidx].guest_phys_address == 0x0) {
665 mem->base_address = mem->regions[regionidx].userspace_address;
666 /* Map VM memory file */
667 if (host_memory_map(dev, mem, ctx.pid, mem->base_address) != 0) {
674 /* Check that we have a valid base address. */
675 if (mem->base_address == 0) {
676 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find base address of qemu memory file.\n", dev->device_fh);
681 /* Check if all of our regions have valid mappings. Usually one does not exist in the QEMU memory file. */
682 valid_regions = mem->nregions;
683 for (regionidx = 0; regionidx < mem->nregions; regionidx++) {
684 if ((mem->regions[regionidx].userspace_address < mem->base_address) ||
685 (mem->regions[regionidx].userspace_address > (mem->base_address + mem->mapped_size)))
689 /* If a region does not have a valid mapping we rebuild our memory struct to contain only valid entries. */
690 if (valid_regions != mem->nregions) {
691 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Not all memory regions exist in the QEMU mem file. Re-populating mem structure\n",
694 /* Re-populate the memory structure with only valid regions. Invalid regions are over-written with memmove. */
697 for (regionidx = mem->nregions; 0 != regionidx--;) {
698 if ((mem->regions[regionidx].userspace_address < mem->base_address) ||
699 (mem->regions[regionidx].userspace_address > (mem->base_address + mem->mapped_size))) {
700 memmove(&mem->regions[regionidx], &mem->regions[regionidx + 1],
701 sizeof(struct virtio_memory_regions) * valid_regions);
707 mem->nregions = valid_regions;
711 * Calculate the address offset for each region. This offset is used to identify the vhost virtual address
712 * corresponding to a QEMU guest physical address.
714 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
715 dev->mem->regions[regionidx].address_offset = dev->mem->regions[regionidx].userspace_address - dev->mem->base_address
716 + dev->mem->mapped_address - dev->mem->regions[regionidx].guest_phys_address;
723 * Called from CUSE IOCTL: VHOST_SET_VRING_NUM
724 * The virtio device sends us the size of the descriptor ring.
727 set_vring_num(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
729 struct virtio_net *dev;
731 dev = get_device(ctx);
735 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
736 dev->virtqueue[state->index]->size = state->num;
742 * Called from CUSE IOCTL: VHOST_SET_VRING_ADDR
743 * The virtio device sends us the desc, used and avail ring addresses. This function
744 * then converts these to our address space.
747 set_vring_addr(struct vhost_device_ctx ctx, struct vhost_vring_addr *addr)
749 struct virtio_net *dev;
750 struct vhost_virtqueue *vq;
752 dev = get_device(ctx);
756 /* addr->index refers to the queue index. The TX queue is 1, RX queue is 0. */
757 vq = dev->virtqueue[addr->index];
759 /* The addresses are converted from QEMU virtual to Vhost virtual. */
760 vq->desc = (struct vring_desc *)(uintptr_t)qva_to_vva(dev, addr->desc_user_addr);
762 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find descriptor ring address.\n", dev->device_fh);
766 vq->avail = (struct vring_avail *)(uintptr_t)qva_to_vva(dev, addr->avail_user_addr);
767 if (vq->avail == 0) {
768 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find available ring address.\n", dev->device_fh);
772 vq->used = (struct vring_used *)(uintptr_t)qva_to_vva(dev, addr->used_user_addr);
774 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find used ring address.\n", dev->device_fh);
778 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address desc: %p\n", dev->device_fh, vq->desc);
779 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address avail: %p\n", dev->device_fh, vq->avail);
780 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address used: %p\n", dev->device_fh, vq->used);
786 * Called from CUSE IOCTL: VHOST_SET_VRING_BASE
787 * The virtio device sends us the available ring last used index.
790 set_vring_base(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
792 struct virtio_net *dev;
794 dev = get_device(ctx);
798 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
799 dev->virtqueue[state->index]->last_used_idx = state->num;
800 dev->virtqueue[state->index]->last_used_idx_res = state->num;
806 * Called from CUSE IOCTL: VHOST_GET_VRING_BASE
807 * We send the virtio device our available ring last used index.
810 get_vring_base(struct vhost_device_ctx ctx, uint32_t index,
811 struct vhost_vring_state *state)
813 struct virtio_net *dev;
815 dev = get_device(ctx);
819 state->index = index;
820 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
821 state->num = dev->virtqueue[state->index]->last_used_idx;
827 * This function uses the eventfd_link kernel module to copy an eventfd file descriptor
828 * provided by QEMU in to our process space.
831 eventfd_copy(struct virtio_net *dev, struct eventfd_copy *eventfd_copy)
833 int eventfd_link, ret;
835 /* Open the character device to the kernel module. */
836 eventfd_link = open(eventfd_cdev, O_RDWR);
837 if (eventfd_link < 0) {
838 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") eventfd_link module is not loaded\n", dev->device_fh);
842 /* Call the IOCTL to copy the eventfd. */
843 ret = ioctl(eventfd_link, EVENTFD_COPY, eventfd_copy);
847 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") EVENTFD_COPY ioctl failed\n", dev->device_fh);
856 * Called from CUSE IOCTL: VHOST_SET_VRING_CALL
857 * The virtio device sends an eventfd to interrupt the guest. This fd gets copied in
858 * to our process space.
861 set_vring_call(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
863 struct virtio_net *dev;
864 struct eventfd_copy eventfd_kick;
865 struct vhost_virtqueue *vq;
867 dev = get_device(ctx);
871 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
872 vq = dev->virtqueue[file->index];
875 close((int)vq->kickfd);
877 /* Populate the eventfd_copy structure and call eventfd_copy. */
878 vq->kickfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
879 eventfd_kick.source_fd = vq->kickfd;
880 eventfd_kick.target_fd = file->fd;
881 eventfd_kick.target_pid = ctx.pid;
883 if (eventfd_copy(dev, &eventfd_kick))
890 * Called from CUSE IOCTL: VHOST_SET_VRING_KICK
891 * The virtio device sends an eventfd that it can use to notify us. This fd gets copied in
892 * to our process space.
895 set_vring_kick(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
897 struct virtio_net *dev;
898 struct eventfd_copy eventfd_call;
899 struct vhost_virtqueue *vq;
901 dev = get_device(ctx);
905 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
906 vq = dev->virtqueue[file->index];
909 close((int)vq->callfd);
911 /* Populate the eventfd_copy structure and call eventfd_copy. */
912 vq->callfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
913 eventfd_call.source_fd = vq->callfd;
914 eventfd_call.target_fd = file->fd;
915 eventfd_call.target_pid = ctx.pid;
917 if (eventfd_copy(dev, &eventfd_call))
924 * Called from CUSE IOCTL: VHOST_NET_SET_BACKEND
925 * To complete device initialisation when the virtio driver is loaded we are provided with a
926 * valid fd for a tap device (not used by us). If this happens then we can add the device to a
927 * data core. When the virtio driver is removed we get fd=-1. At that point we remove the device
928 * from the data core. The device will still exist in the device configuration linked list.
931 set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
933 struct virtio_net *dev;
935 dev = get_device(ctx);
939 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
940 dev->virtqueue[file->index]->backend = file->fd;
942 /* If the device isn't already running and both backend fds are set we add the device. */
943 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
944 if (((int)dev->virtqueue[VIRTIO_TXQ]->backend != VIRTIO_DEV_STOPPED) &&
945 ((int)dev->virtqueue[VIRTIO_RXQ]->backend != VIRTIO_DEV_STOPPED))
946 return notify_ops->new_device(dev);
947 /* Otherwise we remove it. */
949 if (file->fd == VIRTIO_DEV_STOPPED)
950 notify_ops->destroy_device(dev);
955 * Function pointers are set for the device operations to allow CUSE to call functions
956 * when an IOCTL, device_add or device_release is received.
958 static const struct vhost_net_device_ops vhost_device_ops = {
959 .new_device = new_device,
960 .destroy_device = destroy_device,
962 .get_features = get_features,
963 .set_features = set_features,
965 .set_mem_table = set_mem_table,
967 .set_vring_num = set_vring_num,
968 .set_vring_addr = set_vring_addr,
969 .set_vring_base = set_vring_base,
970 .get_vring_base = get_vring_base,
972 .set_vring_kick = set_vring_kick,
973 .set_vring_call = set_vring_call,
975 .set_backend = set_backend,
977 .set_owner = set_owner,
978 .reset_owner = reset_owner,
982 * Called by main to setup callbacks when registering CUSE device.
984 struct vhost_net_device_ops const *
985 get_virtio_net_callbacks(void)
987 return &vhost_device_ops;
990 int rte_vhost_enable_guest_notification(struct virtio_net *dev,
991 uint16_t queue_id, int enable)
994 RTE_LOG(ERR, VHOST_CONFIG, "guest notification isn't supported.\n");
998 dev->virtqueue[queue_id]->used->flags = enable ? 0 : VRING_USED_F_NO_NOTIFY;
1002 uint64_t rte_vhost_feature_get(void)
1004 return VHOST_FEATURES;
1007 int rte_vhost_feature_disable(uint64_t feature_mask)
1009 VHOST_FEATURES = VHOST_FEATURES & ~feature_mask;
1013 int rte_vhost_feature_enable(uint64_t feature_mask)
1015 if ((feature_mask & VHOST_SUPPORTED_FEATURES) == feature_mask) {
1016 VHOST_FEATURES = VHOST_FEATURES | feature_mask;
1023 * Register ops so that we can add/remove device to data core.
1026 rte_vhost_driver_callback_register(struct virtio_net_device_ops const * const ops)