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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>
52 #include "virtio-net.h"
53 #include "vhost-net-cdev.h"
54 #include "eventfd_link/eventfd_link.h"
56 const char eventfd_cdev[] = "/dev/eventfd-link";
58 /* device ops to add/remove device to data core. */
59 static struct virtio_net_device_ops const * notify_ops;
60 /* Root address of the linked list in the configuration core. */
61 static struct virtio_net_config_ll *ll_root = NULL;
63 /* Features supported by this application. RX merge buffers are disabled by default. */
64 uint64_t VHOST_FEATURES = (0ULL << VIRTIO_NET_F_MRG_RXBUF);
66 /* Line size for reading maps file. */
67 const uint32_t BUFSIZE = PATH_MAX;
69 /* Size of prot char array in procmap. */
72 /* Number of elements in procmap struct. */
75 /* Structure containing information gathered from maps file. */
78 uint64_t va_start; /* Start virtual address in file. */
79 uint64_t len; /* Size of file. */
80 uint64_t pgoff; /* Not used. */
81 uint32_t maj; /* Not used. */
82 uint32_t min; /* Not used. */
83 uint32_t ino; /* Not used. */
84 char prot[PROT_SZ]; /* Not used. */
85 char fname[PATH_MAX]; /* File name. */
89 * Converts QEMU virtual address to Vhost virtual address. This function is used
90 * to convert the ring addresses to our address space.
93 qva_to_vva(struct virtio_net *dev, uint64_t qemu_va)
95 struct virtio_memory_regions *region;
96 uint64_t vhost_va = 0;
97 uint32_t regionidx = 0;
99 /* Find the region where the address lives. */
100 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
101 region = &dev->mem->regions[regionidx];
102 if ((qemu_va >= region->userspace_address) &&
103 (qemu_va <= region->userspace_address +
104 region->memory_size)) {
105 vhost_va = dev->mem->mapped_address + qemu_va - dev->mem->base_address;
113 * Locate the file containing QEMU's memory space and map it to our address space.
116 host_memory_map (struct virtio_net *dev, struct virtio_memory *mem, pid_t pid, uint64_t addr)
118 struct dirent *dptr = NULL;
119 struct procmap procmap;
123 char memfile[PATH_MAX];
124 char mapfile[PATH_MAX];
125 char procdir[PATH_MAX];
126 char resolved_path[PATH_MAX];
132 char *str, *sp, *in[PROCMAP_SZ];
135 /* Path where mem files are located. */
136 snprintf (procdir, PATH_MAX, "/proc/%u/fd/", pid);
137 /* Maps file used to locate mem file. */
138 snprintf (mapfile, PATH_MAX, "/proc/%u/maps", pid);
140 fmap = fopen(mapfile, "r");
142 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to open maps file for pid %d\n", dev->device_fh, pid);
146 /* Read through maps file until we find out base_address. */
147 while (fgets(line, BUFSIZE, fmap) != 0) {
150 /* Split line in to fields. */
151 for (i = 0; i < PROCMAP_SZ; i++) {
152 if (((in[i] = strtok_r(str, &dlm[i], &sp)) == NULL) || (errno != 0)) {
159 /* Convert/Copy each field as needed. */
160 procmap.va_start = strtoull(in[0], &end, 16);
161 if ((in[0] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
166 procmap.len = strtoull(in[1], &end, 16);
167 if ((in[1] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
172 procmap.pgoff = strtoull(in[3], &end, 16);
173 if ((in[3] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
178 procmap.maj = strtoul(in[4], &end, 16);
179 if ((in[4] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
184 procmap.min = strtoul(in[5], &end, 16);
185 if ((in[5] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
190 procmap.ino = strtoul(in[6], &end, 16);
191 if ((in[6] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
196 memcpy(&procmap.prot, in[2], PROT_SZ);
197 memcpy(&procmap.fname, in[7], PATH_MAX);
199 if (procmap.va_start == addr) {
200 procmap.len = procmap.len - procmap.va_start;
208 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file in pid %d maps file\n", dev->device_fh, pid);
212 /* Find the guest memory file among the process fds. */
213 dp = opendir(procdir);
215 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Cannot open pid %d process directory \n", dev->device_fh, pid);
222 /* Read the fd directory contents. */
223 while (NULL != (dptr = readdir(dp))) {
224 snprintf (memfile, PATH_MAX, "/proc/%u/fd/%s", pid, dptr->d_name);
225 realpath(memfile, resolved_path);
226 if (resolved_path == NULL) {
227 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to resolve fd directory\n", dev->device_fh);
231 if (strncmp(resolved_path, procmap.fname,
232 strnlen(procmap.fname, PATH_MAX)) == 0) {
241 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find memory file for pid %d\n", dev->device_fh, pid);
244 /* Open the shared memory file and map the memory into this process. */
245 fd = open(memfile, O_RDWR);
248 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to open %s for pid %d\n", dev->device_fh, memfile, pid);
252 map = mmap(0, (size_t)procmap.len, PROT_READ|PROT_WRITE , MAP_POPULATE|MAP_SHARED, fd, 0);
255 if (map == MAP_FAILED) {
256 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Error mapping the file %s for pid %d\n", dev->device_fh, memfile, pid);
260 /* Store the memory address and size in the device data structure */
261 mem->mapped_address = (uint64_t)(uintptr_t)map;
262 mem->mapped_size = procmap.len;
264 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mem File: %s->%s - Size: %llu - VA: %p\n", dev->device_fh,
265 memfile, resolved_path, (long long unsigned)mem->mapped_size, map);
271 * Retrieves an entry from the devices configuration linked list.
273 static struct virtio_net_config_ll *
274 get_config_ll_entry(struct vhost_device_ctx ctx)
276 struct virtio_net_config_ll *ll_dev = ll_root;
278 /* Loop through linked list until the device_fh is found. */
279 while (ll_dev != NULL) {
280 if (ll_dev->dev.device_fh == ctx.fh)
282 ll_dev = ll_dev->next;
289 * Searches the configuration core linked list and retrieves the device if it exists.
291 static struct virtio_net *
292 get_device(struct vhost_device_ctx ctx)
294 struct virtio_net_config_ll *ll_dev;
296 ll_dev = get_config_ll_entry(ctx);
298 /* If a matching entry is found in the linked list, return the device in that entry. */
303 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Device not found in linked list.\n", ctx.fh);
308 * Add entry containing a device to the device configuration linked list.
311 add_config_ll_entry(struct virtio_net_config_ll *new_ll_dev)
313 struct virtio_net_config_ll *ll_dev = ll_root;
315 /* If ll_dev == NULL then this is the first device so go to else */
317 /* If the 1st device_fh != 0 then we insert our device here. */
318 if (ll_dev->dev.device_fh != 0) {
319 new_ll_dev->dev.device_fh = 0;
320 new_ll_dev->next = ll_dev;
321 ll_root = new_ll_dev;
323 /* Increment through the ll until we find un unused device_fh. Insert the device at that entry*/
324 while ((ll_dev->next != NULL) && (ll_dev->dev.device_fh == (ll_dev->next->dev.device_fh - 1)))
325 ll_dev = ll_dev->next;
327 new_ll_dev->dev.device_fh = ll_dev->dev.device_fh + 1;
328 new_ll_dev->next = ll_dev->next;
329 ll_dev->next = new_ll_dev;
332 ll_root = new_ll_dev;
333 ll_root->dev.device_fh = 0;
339 * Unmap any memory, close any file descriptors and free any memory owned by a device.
342 cleanup_device(struct virtio_net *dev)
344 /* Unmap QEMU memory file if mapped. */
346 munmap((void*)(uintptr_t)dev->mem->mapped_address, (size_t)dev->mem->mapped_size);
350 /* Close any event notifiers opened by device. */
351 if (dev->virtqueue[VIRTIO_RXQ]->callfd)
352 close((int)dev->virtqueue[VIRTIO_RXQ]->callfd);
353 if (dev->virtqueue[VIRTIO_RXQ]->kickfd)
354 close((int)dev->virtqueue[VIRTIO_RXQ]->kickfd);
355 if (dev->virtqueue[VIRTIO_TXQ]->callfd)
356 close((int)dev->virtqueue[VIRTIO_TXQ]->callfd);
357 if (dev->virtqueue[VIRTIO_TXQ]->kickfd)
358 close((int)dev->virtqueue[VIRTIO_TXQ]->kickfd);
362 * Release virtqueues and device memory.
365 free_device(struct virtio_net_config_ll *ll_dev)
367 /* Free any malloc'd memory */
368 free(ll_dev->dev.virtqueue[VIRTIO_RXQ]);
369 free(ll_dev->dev.virtqueue[VIRTIO_TXQ]);
373 * Remove an entry from the device configuration linked list.
375 static struct virtio_net_config_ll *
376 rm_config_ll_entry(struct virtio_net_config_ll *ll_dev, struct virtio_net_config_ll *ll_dev_last)
378 /* First remove the device and then clean it up. */
379 if (ll_dev == ll_root) {
380 ll_root = ll_dev->next;
381 cleanup_device(&ll_dev->dev);
385 if (likely(ll_dev_last != NULL)) {
386 ll_dev_last->next = ll_dev->next;
387 cleanup_device(&ll_dev->dev);
389 return ll_dev_last->next;
391 cleanup_device(&ll_dev->dev);
393 RTE_LOG(ERR, VHOST_CONFIG, "Remove entry from config_ll failed\n");
400 * Initialise all variables in device structure.
403 init_device(struct virtio_net *dev)
407 /* Virtqueues have already been malloced so we don't want to set them to NULL. */
408 vq_offset = offsetof(struct virtio_net, mem);
410 /* Set everything to 0. */
411 memset((void*)(uintptr_t)((uint64_t)(uintptr_t)dev + vq_offset), 0,
412 (sizeof(struct virtio_net) - (size_t)vq_offset));
413 memset(dev->virtqueue[VIRTIO_RXQ], 0, sizeof(struct vhost_virtqueue));
414 memset(dev->virtqueue[VIRTIO_TXQ], 0, sizeof(struct vhost_virtqueue));
416 /* Backends are set to -1 indicating an inactive device. */
417 dev->virtqueue[VIRTIO_RXQ]->backend = VIRTIO_DEV_STOPPED;
418 dev->virtqueue[VIRTIO_TXQ]->backend = VIRTIO_DEV_STOPPED;
422 * Function is called from the CUSE open function. The device structure is
423 * initialised and a new entry is added to the device configuration linked
427 new_device(struct vhost_device_ctx ctx)
429 struct virtio_net_config_ll *new_ll_dev;
430 struct vhost_virtqueue *virtqueue_rx, *virtqueue_tx;
432 /* Setup device and virtqueues. */
433 new_ll_dev = malloc(sizeof(struct virtio_net_config_ll));
434 if (new_ll_dev == NULL) {
435 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to allocate memory for dev.\n", ctx.fh);
439 virtqueue_rx = malloc(sizeof(struct vhost_virtqueue));
440 if (virtqueue_rx == NULL) {
442 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to allocate memory for virtqueue_rx.\n", ctx.fh);
446 virtqueue_tx = malloc(sizeof(struct vhost_virtqueue));
447 if (virtqueue_tx == NULL) {
450 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to allocate memory for virtqueue_tx.\n", ctx.fh);
454 new_ll_dev->dev.virtqueue[VIRTIO_RXQ] = virtqueue_rx;
455 new_ll_dev->dev.virtqueue[VIRTIO_TXQ] = virtqueue_tx;
457 /* Initialise device and virtqueues. */
458 init_device(&new_ll_dev->dev);
460 new_ll_dev->next = NULL;
462 /* Add entry to device configuration linked list. */
463 add_config_ll_entry(new_ll_dev);
465 return new_ll_dev->dev.device_fh;
469 * Function is called from the CUSE release function. This function will cleanup
470 * the device and remove it from device configuration linked list.
473 destroy_device(struct vhost_device_ctx ctx)
475 struct virtio_net_config_ll *ll_dev_cur_ctx, *ll_dev_last = NULL;
476 struct virtio_net_config_ll *ll_dev_cur = ll_root;
478 /* Find the linked list entry for the device to be removed. */
479 ll_dev_cur_ctx = get_config_ll_entry(ctx);
480 while (ll_dev_cur != NULL) {
481 /* If the device is found or a device that doesn't exist is found then it is removed. */
482 if (ll_dev_cur == ll_dev_cur_ctx) {
484 * If the device is running on a data core then call the function to remove it from
487 if ((ll_dev_cur->dev.flags & VIRTIO_DEV_RUNNING))
488 notify_ops->destroy_device(&(ll_dev_cur->dev));
489 ll_dev_cur = rm_config_ll_entry(ll_dev_cur, ll_dev_last);
491 ll_dev_last = ll_dev_cur;
492 ll_dev_cur = ll_dev_cur->next;
498 * Called from CUSE IOCTL: VHOST_SET_OWNER
499 * This function just returns success at the moment unless the device hasn't been initialised.
502 set_owner(struct vhost_device_ctx ctx)
504 struct virtio_net *dev;
506 dev = get_device(ctx);
514 * Called from CUSE IOCTL: VHOST_RESET_OWNER
517 reset_owner(struct vhost_device_ctx ctx)
519 struct virtio_net_config_ll *ll_dev;
521 ll_dev = get_config_ll_entry(ctx);
523 cleanup_device(&ll_dev->dev);
524 init_device(&ll_dev->dev);
530 * Called from CUSE IOCTL: VHOST_GET_FEATURES
531 * The features that we support are requested.
534 get_features(struct vhost_device_ctx ctx, uint64_t *pu)
536 struct virtio_net *dev;
538 dev = get_device(ctx);
542 /* Send our supported features. */
543 *pu = VHOST_FEATURES;
548 * Called from CUSE IOCTL: VHOST_SET_FEATURES
549 * We receive the negotiated set of features supported by us and the virtio device.
552 set_features(struct vhost_device_ctx ctx, uint64_t *pu)
554 struct virtio_net *dev;
556 dev = get_device(ctx);
559 if (*pu & ~VHOST_FEATURES)
562 /* Store the negotiated feature list for the device. */
565 /* Set the vhost_hlen depending on if VIRTIO_NET_F_MRG_RXBUF is set. */
566 if (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
567 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mergeable RX buffers enabled\n", dev->device_fh);
568 dev->virtqueue[VIRTIO_RXQ]->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
569 dev->virtqueue[VIRTIO_TXQ]->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
571 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Mergeable RX buffers disabled\n", dev->device_fh);
572 dev->virtqueue[VIRTIO_RXQ]->vhost_hlen = sizeof(struct virtio_net_hdr);
573 dev->virtqueue[VIRTIO_TXQ]->vhost_hlen = sizeof(struct virtio_net_hdr);
580 * Called from CUSE IOCTL: VHOST_SET_MEM_TABLE
581 * This function creates and populates the memory structure for the device. This includes
582 * storing offsets used to translate buffer addresses.
585 set_mem_table(struct vhost_device_ctx ctx, const void *mem_regions_addr, uint32_t nregions)
587 struct virtio_net *dev;
588 struct vhost_memory_region *mem_regions;
589 struct virtio_memory *mem;
590 uint64_t size = offsetof(struct vhost_memory, regions);
591 uint32_t regionidx, valid_regions;
593 dev = get_device(ctx);
598 munmap((void*)(uintptr_t)dev->mem->mapped_address, (size_t)dev->mem->mapped_size);
602 /* Malloc the memory structure depending on the number of regions. */
603 mem = calloc(1, sizeof(struct virtio_memory) + (sizeof(struct virtio_memory_regions) * nregions));
605 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to allocate memory for dev->mem.\n", dev->device_fh);
609 mem->nregions = nregions;
611 mem_regions = (void*)(uintptr_t)((uint64_t)(uintptr_t)mem_regions_addr + size);
613 for (regionidx = 0; regionidx < mem->nregions; regionidx++) {
614 /* Populate the region structure for each region. */
615 mem->regions[regionidx].guest_phys_address = mem_regions[regionidx].guest_phys_addr;
616 mem->regions[regionidx].guest_phys_address_end = mem->regions[regionidx].guest_phys_address +
617 mem_regions[regionidx].memory_size;
618 mem->regions[regionidx].memory_size = mem_regions[regionidx].memory_size;
619 mem->regions[regionidx].userspace_address = mem_regions[regionidx].userspace_addr;
621 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") REGION: %u - GPA: %p - QEMU VA: %p - SIZE (%"PRIu64")\n", dev->device_fh,
622 regionidx, (void*)(uintptr_t)mem->regions[regionidx].guest_phys_address,
623 (void*)(uintptr_t)mem->regions[regionidx].userspace_address,
624 mem->regions[regionidx].memory_size);
626 /*set the base address mapping*/
627 if (mem->regions[regionidx].guest_phys_address == 0x0) {
628 mem->base_address = mem->regions[regionidx].userspace_address;
629 /* Map VM memory file */
630 if (host_memory_map(dev, mem, ctx.pid, mem->base_address) != 0) {
637 /* Check that we have a valid base address. */
638 if (mem->base_address == 0) {
639 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find base address of qemu memory file.\n", dev->device_fh);
644 /* Check if all of our regions have valid mappings. Usually one does not exist in the QEMU memory file. */
645 valid_regions = mem->nregions;
646 for (regionidx = 0; regionidx < mem->nregions; regionidx++) {
647 if ((mem->regions[regionidx].userspace_address < mem->base_address) ||
648 (mem->regions[regionidx].userspace_address > (mem->base_address + mem->mapped_size)))
652 /* If a region does not have a valid mapping we rebuild our memory struct to contain only valid entries. */
653 if (valid_regions != mem->nregions) {
654 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") Not all memory regions exist in the QEMU mem file. Re-populating mem structure\n",
657 /* Re-populate the memory structure with only valid regions. Invalid regions are over-written with memmove. */
660 for (regionidx = mem->nregions; 0 != regionidx--;) {
661 if ((mem->regions[regionidx].userspace_address < mem->base_address) ||
662 (mem->regions[regionidx].userspace_address > (mem->base_address + mem->mapped_size))) {
663 memmove(&mem->regions[regionidx], &mem->regions[regionidx + 1],
664 sizeof(struct virtio_memory_regions) * valid_regions);
670 mem->nregions = valid_regions;
674 * Calculate the address offset for each region. This offset is used to identify the vhost virtual address
675 * corresponding to a QEMU guest physical address.
677 for (regionidx = 0; regionidx < dev->mem->nregions; regionidx++) {
678 dev->mem->regions[regionidx].address_offset = dev->mem->regions[regionidx].userspace_address - dev->mem->base_address
679 + dev->mem->mapped_address - dev->mem->regions[regionidx].guest_phys_address;
686 * Called from CUSE IOCTL: VHOST_SET_VRING_NUM
687 * The virtio device sends us the size of the descriptor ring.
690 set_vring_num(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
692 struct virtio_net *dev;
694 dev = get_device(ctx);
698 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
699 dev->virtqueue[state->index]->size = state->num;
705 * Called from CUSE IOCTL: VHOST_SET_VRING_ADDR
706 * The virtio device sends us the desc, used and avail ring addresses. This function
707 * then converts these to our address space.
710 set_vring_addr(struct vhost_device_ctx ctx, struct vhost_vring_addr *addr)
712 struct virtio_net *dev;
713 struct vhost_virtqueue *vq;
715 dev = get_device(ctx);
719 /* addr->index refers to the queue index. The TX queue is 1, RX queue is 0. */
720 vq = dev->virtqueue[addr->index];
722 /* The addresses are converted from QEMU virtual to Vhost virtual. */
723 vq->desc = (struct vring_desc*)(uintptr_t)qva_to_vva(dev, addr->desc_user_addr);
725 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find descriptor ring address.\n", dev->device_fh);
729 vq->avail = (struct vring_avail*)(uintptr_t)qva_to_vva(dev, addr->avail_user_addr);
730 if (vq->avail == 0) {
731 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find available ring address.\n", dev->device_fh);
735 vq->used = (struct vring_used*)(uintptr_t)qva_to_vva(dev, addr->used_user_addr);
737 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") Failed to find used ring address.\n", dev->device_fh);
741 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address desc: %p\n", dev->device_fh, vq->desc);
742 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address avail: %p\n", dev->device_fh, vq->avail);
743 LOG_DEBUG(VHOST_CONFIG, "(%"PRIu64") mapped address used: %p\n", dev->device_fh, vq->used);
749 * Called from CUSE IOCTL: VHOST_SET_VRING_BASE
750 * The virtio device sends us the available ring last used index.
753 set_vring_base(struct vhost_device_ctx ctx, struct vhost_vring_state *state)
755 struct virtio_net *dev;
757 dev = get_device(ctx);
761 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
762 dev->virtqueue[state->index]->last_used_idx = state->num;
763 dev->virtqueue[state->index]->last_used_idx_res = state->num;
769 * Called from CUSE IOCTL: VHOST_GET_VRING_BASE
770 * We send the virtio device our available ring last used index.
773 get_vring_base(struct vhost_device_ctx ctx, uint32_t index, struct vhost_vring_state *state)
775 struct virtio_net *dev;
777 dev = get_device(ctx);
781 state->index = index;
782 /* State->index refers to the queue index. The TX queue is 1, RX queue is 0. */
783 state->num = dev->virtqueue[state->index]->last_used_idx;
789 * This function uses the eventfd_link kernel module to copy an eventfd file descriptor
790 * provided by QEMU in to our process space.
793 eventfd_copy(struct virtio_net *dev, struct eventfd_copy *eventfd_copy)
795 int eventfd_link, ret;
797 /* Open the character device to the kernel module. */
798 eventfd_link = open(eventfd_cdev, O_RDWR);
799 if (eventfd_link < 0) {
800 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") eventfd_link module is not loaded\n", dev->device_fh);
804 /* Call the IOCTL to copy the eventfd. */
805 ret = ioctl(eventfd_link, EVENTFD_COPY, eventfd_copy);
809 RTE_LOG(ERR, VHOST_CONFIG, "(%"PRIu64") EVENTFD_COPY ioctl failed\n", dev->device_fh);
818 * Called from CUSE IOCTL: VHOST_SET_VRING_CALL
819 * The virtio device sends an eventfd to interrupt the guest. This fd gets copied in
820 * to our process space.
823 set_vring_call(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
825 struct virtio_net *dev;
826 struct eventfd_copy eventfd_kick;
827 struct vhost_virtqueue *vq;
829 dev = get_device(ctx);
833 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
834 vq = dev->virtqueue[file->index];
837 close((int)vq->kickfd);
839 /* Populate the eventfd_copy structure and call eventfd_copy. */
840 vq->kickfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
841 eventfd_kick.source_fd = vq->kickfd;
842 eventfd_kick.target_fd = file->fd;
843 eventfd_kick.target_pid = ctx.pid;
845 if (eventfd_copy(dev, &eventfd_kick))
852 * Called from CUSE IOCTL: VHOST_SET_VRING_KICK
853 * The virtio device sends an eventfd that it can use to notify us. This fd gets copied in
854 * to our process space.
857 set_vring_kick(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
859 struct virtio_net *dev;
860 struct eventfd_copy eventfd_call;
861 struct vhost_virtqueue *vq;
863 dev = get_device(ctx);
867 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
868 vq = dev->virtqueue[file->index];
871 close((int)vq->callfd);
873 /* Populate the eventfd_copy structure and call eventfd_copy. */
874 vq->callfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
875 eventfd_call.source_fd = vq->callfd;
876 eventfd_call.target_fd = file->fd;
877 eventfd_call.target_pid = ctx.pid;
879 if (eventfd_copy(dev, &eventfd_call))
886 * Called from CUSE IOCTL: VHOST_NET_SET_BACKEND
887 * To complete device initialisation when the virtio driver is loaded we are provided with a
888 * valid fd for a tap device (not used by us). If this happens then we can add the device to a
889 * data core. When the virtio driver is removed we get fd=-1. At that point we remove the device
890 * from the data core. The device will still exist in the device configuration linked list.
893 set_backend(struct vhost_device_ctx ctx, struct vhost_vring_file *file)
895 struct virtio_net *dev;
897 dev = get_device(ctx);
902 /* file->index refers to the queue index. The TX queue is 1, RX queue is 0. */
903 dev->virtqueue[file->index]->backend = file->fd;
905 /* If the device isn't already running and both backend fds are set we add the device. */
906 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
907 if (((int)dev->virtqueue[VIRTIO_TXQ]->backend != VIRTIO_DEV_STOPPED) &&
908 ((int)dev->virtqueue[VIRTIO_RXQ]->backend != VIRTIO_DEV_STOPPED))
909 return notify_ops->new_device(dev);
910 /* Otherwise we remove it. */
912 if (file->fd == VIRTIO_DEV_STOPPED) {
913 notify_ops->destroy_device(dev);
919 * Function pointers are set for the device operations to allow CUSE to call functions
920 * when an IOCTL, device_add or device_release is received.
922 static const struct vhost_net_device_ops vhost_device_ops =
924 .new_device = new_device,
925 .destroy_device = destroy_device,
927 .get_features = get_features,
928 .set_features = set_features,
930 .set_mem_table = set_mem_table,
932 .set_vring_num = set_vring_num,
933 .set_vring_addr = set_vring_addr,
934 .set_vring_base = set_vring_base,
935 .get_vring_base = get_vring_base,
937 .set_vring_kick = set_vring_kick,
938 .set_vring_call = set_vring_call,
940 .set_backend = set_backend,
942 .set_owner = set_owner,
943 .reset_owner = reset_owner,
947 * Called by main to setup callbacks when registering CUSE device.
949 struct vhost_net_device_ops const *
950 get_virtio_net_callbacks(void)
952 return &vhost_device_ops;
956 * Register ops so that we can add/remove device to data core.
959 init_virtio_net(struct virtio_net_device_ops const * const ops)
967 * Currently not used as we Ctrl+c to exit application.
970 deinit_virtio_net(void)