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vhost.c
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vhost.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2017 Intel Corporation
*/
#include <linux/vhost.h>
#include <linux/virtio_net.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numa.h>
#include <numaif.h>
#endif
#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_log.h>
#include <rte_string_fns.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include <rte_rwlock.h>
#include "iotlb.h"
#include "vhost.h"
#include "vhost_user.h"
struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
pthread_mutex_t vhost_dev_lock = PTHREAD_MUTEX_INITIALIZER;
/* Called with iotlb_lock read-locked */
uint64_t
__vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t iova, uint64_t *size, uint8_t perm)
{
uint64_t vva, tmp_size;
if (unlikely(!*size))
return 0;
tmp_size = *size;
vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
if (tmp_size == *size)
return vva;
iova += tmp_size;
if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
/*
* iotlb_lock is read-locked for a full burst,
* but it only protects the iotlb cache.
* In case of IOTLB miss, we might block on the socket,
* which could cause a deadlock with QEMU if an IOTLB update
* is being handled. We can safely unlock here to avoid it.
*/
vhost_user_iotlb_rd_unlock(vq);
vhost_user_iotlb_pending_insert(vq, iova, perm);
if (vhost_user_iotlb_miss(dev, iova, perm)) {
VHOST_LOG_CONFIG(ERR,
"IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
iova);
vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
}
vhost_user_iotlb_rd_lock(vq);
}
return 0;
}
#define VHOST_LOG_PAGE 4096
/*
* Atomically set a bit in memory.
*/
static __rte_always_inline void
vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
{
#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
/*
* __sync_ built-ins are deprecated, but __atomic_ ones
* are sub-optimized in older GCC versions.
*/
__sync_fetch_and_or_1(addr, (1U << nr));
#else
__atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
#endif
}
static __rte_always_inline void
vhost_log_page(uint8_t *log_base, uint64_t page)
{
vhost_set_bit(page % 8, &log_base[page / 8]);
}
void
__vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
{
uint64_t page;
if (unlikely(!dev->log_base || !len))
return;
if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
return;
/* To make sure guest memory updates are committed before logging */
rte_smp_wmb();
page = addr / VHOST_LOG_PAGE;
while (page * VHOST_LOG_PAGE < addr + len) {
vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
page += 1;
}
}
void
__vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t iova, uint64_t len)
{
uint64_t hva, gpa, map_len;
map_len = len;
hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
if (map_len != len) {
VHOST_LOG_DATA(ERR,
"Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
iova);
return;
}
gpa = hva_to_gpa(dev, hva, len);
if (gpa)
__vhost_log_write(dev, gpa, len);
}
void
__vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
unsigned long *log_base;
int i;
if (unlikely(!dev->log_base))
return;
rte_smp_wmb();
log_base = (unsigned long *)(uintptr_t)dev->log_base;
for (i = 0; i < vq->log_cache_nb_elem; i++) {
struct log_cache_entry *elem = vq->log_cache + i;
#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
/*
* '__sync' builtins are deprecated, but '__atomic' ones
* are sub-optimized in older GCC versions.
*/
__sync_fetch_and_or(log_base + elem->offset, elem->val);
#else
__atomic_fetch_or(log_base + elem->offset, elem->val,
__ATOMIC_RELAXED);
#endif
}
rte_smp_wmb();
vq->log_cache_nb_elem = 0;
}
static __rte_always_inline void
vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t page)
{
uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
uint32_t offset = page / (sizeof(unsigned long) << 3);
int i;
for (i = 0; i < vq->log_cache_nb_elem; i++) {
struct log_cache_entry *elem = vq->log_cache + i;
if (elem->offset == offset) {
elem->val |= (1UL << bit_nr);
return;
}
}
if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
/*
* No more room for a new log cache entry,
* so write the dirty log map directly.
*/
rte_smp_wmb();
vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
return;
}
vq->log_cache[i].offset = offset;
vq->log_cache[i].val = (1UL << bit_nr);
vq->log_cache_nb_elem++;
}
void
__vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t addr, uint64_t len)
{
uint64_t page;
if (unlikely(!dev->log_base || !len))
return;
if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
return;
page = addr / VHOST_LOG_PAGE;
while (page * VHOST_LOG_PAGE < addr + len) {
vhost_log_cache_page(dev, vq, page);
page += 1;
}
}
void
__vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t iova, uint64_t len)
{
uint64_t hva, gpa, map_len;
map_len = len;
hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
if (map_len != len) {
VHOST_LOG_DATA(ERR,
"Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
iova);
return;
}
gpa = hva_to_gpa(dev, hva, len);
if (gpa)
__vhost_log_cache_write(dev, vq, gpa, len);
}
void *
vhost_alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t desc_addr, uint64_t desc_len)
{
void *idesc;
uint64_t src, dst;
uint64_t len, remain = desc_len;
idesc = rte_malloc(__func__, desc_len, 0);
if (unlikely(!idesc))
return NULL;
dst = (uint64_t)(uintptr_t)idesc;
while (remain) {
len = remain;
src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
VHOST_ACCESS_RO);
if (unlikely(!src || !len)) {
rte_free(idesc);
return NULL;
}
rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
remain -= len;
dst += len;
desc_addr += len;
}
return idesc;
}
void
cleanup_vq(struct vhost_virtqueue *vq, int destroy)
{
if ((vq->callfd >= 0) && (destroy != 0))
close(vq->callfd);
if (vq->kickfd >= 0)
close(vq->kickfd);
}
void
cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (!(dev->protocol_features &
(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
return;
if (vq_is_packed(dev)) {
if (vq->inflight_packed)
vq->inflight_packed = NULL;
} else {
if (vq->inflight_split)
vq->inflight_split = NULL;
}
if (vq->resubmit_inflight) {
if (vq->resubmit_inflight->resubmit_list) {
free(vq->resubmit_inflight->resubmit_list);
vq->resubmit_inflight->resubmit_list = NULL;
}
free(vq->resubmit_inflight);
vq->resubmit_inflight = NULL;
}
}
/*
* Unmap any memory, close any file descriptors and
* free any memory owned by a device.
*/
void
cleanup_device(struct virtio_net *dev, int destroy)
{
uint32_t i;
vhost_backend_cleanup(dev);
for (i = 0; i < dev->nr_vring; i++) {
cleanup_vq(dev->virtqueue[i], destroy);
cleanup_vq_inflight(dev, dev->virtqueue[i]);
}
}
static void
vhost_free_async_mem(struct vhost_virtqueue *vq)
{
if (vq->async_pkts_pending)
rte_free(vq->async_pkts_pending);
if (vq->async_pkts_info)
rte_free(vq->async_pkts_info);
if (vq->it_pool)
rte_free(vq->it_pool);
if (vq->vec_pool)
rte_free(vq->vec_pool);
vq->async_pkts_pending = NULL;
vq->async_pkts_info = NULL;
vq->it_pool = NULL;
vq->vec_pool = NULL;
}
void
free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (vq_is_packed(dev))
rte_free(vq->shadow_used_packed);
else {
rte_free(vq->shadow_used_split);
vhost_free_async_mem(vq);
}
rte_free(vq->batch_copy_elems);
rte_mempool_free(vq->iotlb_pool);
rte_free(vq);
}
/*
* Release virtqueues and device memory.
*/
static void
free_device(struct virtio_net *dev)
{
uint32_t i;
for (i = 0; i < dev->nr_vring; i++)
free_vq(dev, dev->virtqueue[i]);
rte_free(dev);
}
static __rte_always_inline int
log_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (likely(!(vq->ring_addrs.flags & (1 << VHOST_VRING_F_LOG))))
return 0;
vq->log_guest_addr = translate_log_addr(dev, vq,
vq->ring_addrs.log_guest_addr);
if (vq->log_guest_addr == 0)
return -1;
return 0;
}
/*
* Converts vring log address to GPA
* If IOMMU is enabled, the log address is IOVA
* If IOMMU not enabled, the log address is already GPA
*
* Caller should have iotlb_lock read-locked
*/
uint64_t
translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
uint64_t log_addr)
{
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
const uint64_t exp_size = sizeof(uint64_t);
uint64_t hva, gpa;
uint64_t size = exp_size;
hva = vhost_iova_to_vva(dev, vq, log_addr,
&size, VHOST_ACCESS_RW);
if (size != exp_size)
return 0;
gpa = hva_to_gpa(dev, hva, exp_size);
if (!gpa) {
VHOST_LOG_CONFIG(ERR,
"VQ: Failed to find GPA for log_addr: 0x%"
PRIx64 " hva: 0x%" PRIx64 "\n",
log_addr, hva);
return 0;
}
return gpa;
} else
return log_addr;
}
/* Caller should have iotlb_lock read-locked */
static int
vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
uint64_t req_size, size;
req_size = sizeof(struct vring_desc) * vq->size;
size = req_size;
vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.desc_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->desc || size != req_size)
return -1;
req_size = sizeof(struct vring_avail);
req_size += sizeof(uint16_t) * vq->size;
if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
req_size += sizeof(uint16_t);
size = req_size;
vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.avail_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->avail || size != req_size)
return -1;
req_size = sizeof(struct vring_used);
req_size += sizeof(struct vring_used_elem) * vq->size;
if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
req_size += sizeof(uint16_t);
size = req_size;
vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
vq->ring_addrs.used_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->used || size != req_size)
return -1;
return 0;
}
/* Caller should have iotlb_lock read-locked */
static int
vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
uint64_t req_size, size;
req_size = sizeof(struct vring_packed_desc) * vq->size;
size = req_size;
vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->desc_packed || size != req_size)
return -1;
req_size = sizeof(struct vring_packed_desc_event);
size = req_size;
vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->driver_event || size != req_size)
return -1;
req_size = sizeof(struct vring_packed_desc_event);
size = req_size;
vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
&size, VHOST_ACCESS_RW);
if (!vq->device_event || size != req_size)
return -1;
return 0;
}
int
vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
return -1;
if (vq_is_packed(dev)) {
if (vring_translate_packed(dev, vq) < 0)
return -1;
} else {
if (vring_translate_split(dev, vq) < 0)
return -1;
}
if (log_translate(dev, vq) < 0)
return -1;
vq->access_ok = 1;
return 0;
}
void
vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
vhost_user_iotlb_wr_lock(vq);
vq->access_ok = 0;
vq->desc = NULL;
vq->avail = NULL;
vq->used = NULL;
vq->log_guest_addr = 0;
if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
vhost_user_iotlb_wr_unlock(vq);
}
static void
init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
if (vring_idx >= VHOST_MAX_VRING) {
VHOST_LOG_CONFIG(ERR,
"Failed not init vring, out of bound (%d)\n",
vring_idx);
return;
}
vq = dev->virtqueue[vring_idx];
if (!vq) {
VHOST_LOG_CONFIG(ERR, "Virtqueue not allocated (%d)\n",
vring_idx);
return;
}
memset(vq, 0, sizeof(struct vhost_virtqueue));
vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
vq->notif_enable = VIRTIO_UNINITIALIZED_NOTIF;
vhost_user_iotlb_init(dev, vring_idx);
/* Backends are set to -1 indicating an inactive device. */
vq->backend = -1;
}
static void
reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
int callfd;
if (vring_idx >= VHOST_MAX_VRING) {
VHOST_LOG_CONFIG(ERR,
"Failed not init vring, out of bound (%d)\n",
vring_idx);
return;
}
vq = dev->virtqueue[vring_idx];
if (!vq) {
VHOST_LOG_CONFIG(ERR, "Virtqueue not allocated (%d)\n",
vring_idx);
return;
}
callfd = vq->callfd;
init_vring_queue(dev, vring_idx);
vq->callfd = callfd;
}
int
alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
{
struct vhost_virtqueue *vq;
uint32_t i;
/* Also allocate holes, if any, up to requested vring index. */
for (i = 0; i <= vring_idx; i++) {
if (dev->virtqueue[i])
continue;
vq = rte_zmalloc(NULL, sizeof(struct vhost_virtqueue), 0);
if (vq == NULL) {
VHOST_LOG_CONFIG(ERR,
"Failed to allocate memory for vring:%u.\n", i);
return -1;
}
dev->virtqueue[i] = vq;
init_vring_queue(dev, i);
rte_spinlock_init(&vq->access_lock);
vq->avail_wrap_counter = 1;
vq->used_wrap_counter = 1;
vq->signalled_used_valid = false;
}
dev->nr_vring = RTE_MAX(dev->nr_vring, vring_idx + 1);
return 0;
}
/*
* Reset some variables in device structure, while keeping few
* others untouched, such as vid, ifname, nr_vring: they
* should be same unless the device is removed.
*/
void
reset_device(struct virtio_net *dev)
{
uint32_t i;
dev->features = 0;
dev->protocol_features = 0;
dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
for (i = 0; i < dev->nr_vring; i++)
reset_vring_queue(dev, i);
}
/*
* Invoked when there is a new vhost-user connection established (when
* there is a new virtio device being attached).
*/
int
vhost_new_device(void)
{
struct virtio_net *dev;
int i;
pthread_mutex_lock(&vhost_dev_lock);
for (i = 0; i < MAX_VHOST_DEVICE; i++) {
if (vhost_devices[i] == NULL)
break;
}
if (i == MAX_VHOST_DEVICE) {
VHOST_LOG_CONFIG(ERR,
"Failed to find a free slot for new device.\n");
pthread_mutex_unlock(&vhost_dev_lock);
return -1;
}
dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
if (dev == NULL) {
VHOST_LOG_CONFIG(ERR,
"Failed to allocate memory for new dev.\n");
pthread_mutex_unlock(&vhost_dev_lock);
return -1;
}
vhost_devices[i] = dev;
pthread_mutex_unlock(&vhost_dev_lock);
dev->vid = i;
dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
dev->slave_req_fd = -1;
dev->postcopy_ufd = -1;
rte_spinlock_init(&dev->slave_req_lock);
return i;
}
void
vhost_destroy_device_notify(struct virtio_net *dev)
{
struct rte_vdpa_device *vdpa_dev;
if (dev->flags & VIRTIO_DEV_RUNNING) {
vdpa_dev = dev->vdpa_dev;
if (vdpa_dev)
vdpa_dev->ops->dev_close(dev->vid);
dev->flags &= ~VIRTIO_DEV_RUNNING;
dev->notify_ops->destroy_device(dev->vid);
}
}
/*
* Invoked when there is the vhost-user connection is broken (when
* the virtio device is being detached).
*/
void
vhost_destroy_device(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
vhost_destroy_device_notify(dev);
cleanup_device(dev, 1);
free_device(dev);
vhost_devices[vid] = NULL;
}
void
vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *vdpa_dev)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
dev->vdpa_dev = vdpa_dev;
}
void
vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
{
struct virtio_net *dev;
unsigned int len;
dev = get_device(vid);
if (dev == NULL)
return;
len = if_len > sizeof(dev->ifname) ?
sizeof(dev->ifname) : if_len;
strncpy(dev->ifname, if_name, len);
dev->ifname[sizeof(dev->ifname) - 1] = '\0';
}
void
vhost_set_builtin_virtio_net(int vid, bool enable)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
if (enable)
dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
else
dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
}
void
vhost_enable_extbuf(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
dev->extbuf = 1;
}
void
vhost_enable_linearbuf(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return;
dev->linearbuf = 1;
}
int
rte_vhost_get_mtu(int vid, uint16_t *mtu)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL || mtu == NULL)
return -ENODEV;
if (!(dev->flags & VIRTIO_DEV_READY))
return -EAGAIN;
if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
return -ENOTSUP;
*mtu = dev->mtu;
return 0;
}
int
rte_vhost_get_numa_node(int vid)
{
#ifdef RTE_LIBRTE_VHOST_NUMA
struct virtio_net *dev = get_device(vid);
int numa_node;
int ret;
if (dev == NULL || numa_available() != 0)
return -1;
ret = get_mempolicy(&numa_node, NULL, 0, dev,
MPOL_F_NODE | MPOL_F_ADDR);
if (ret < 0) {
VHOST_LOG_CONFIG(ERR,
"(%d) failed to query numa node: %s\n",
vid, rte_strerror(errno));
return -1;
}
return numa_node;
#else
RTE_SET_USED(vid);
return -1;
#endif
}
uint32_t
rte_vhost_get_queue_num(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return 0;
return dev->nr_vring / 2;
}
uint16_t
rte_vhost_get_vring_num(int vid)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL)
return 0;
return dev->nr_vring;
}
int
rte_vhost_get_ifname(int vid, char *buf, size_t len)
{
struct virtio_net *dev = get_device(vid);
if (dev == NULL || buf == NULL)
return -1;
len = RTE_MIN(len, sizeof(dev->ifname));
strncpy(buf, dev->ifname, len);
buf[len - 1] = '\0';
return 0;
}
int
rte_vhost_get_negotiated_features(int vid, uint64_t *features)
{
struct virtio_net *dev;
dev = get_device(vid);
if (dev == NULL || features == NULL)
return -1;
*features = dev->features;
return 0;
}
int
rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
{
struct virtio_net *dev;
struct rte_vhost_memory *m;
size_t size;
dev = get_device(vid);
if (dev == NULL || mem == NULL)
return -1;
size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
m = malloc(sizeof(struct rte_vhost_memory) + size);
if (!m)
return -1;
m->nregions = dev->mem->nregions;
memcpy(m->regions, dev->mem->regions, size);
*mem = m;
return 0;
}
int
rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
struct rte_vhost_vring *vring)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (dev == NULL || vring == NULL)
return -1;
if (vring_idx >= VHOST_MAX_VRING)
return -1;
vq = dev->virtqueue[vring_idx];
if (!vq)
return -1;
if (vq_is_packed(dev)) {
vring->desc_packed = vq->desc_packed;
vring->driver_event = vq->driver_event;
vring->device_event = vq->device_event;
} else {
vring->desc = vq->desc;
vring->avail = vq->avail;
vring->used = vq->used;
}
vring->log_guest_addr = vq->log_guest_addr;
vring->callfd = vq->callfd;
vring->kickfd = vq->kickfd;
vring->size = vq->size;
return 0;
}
int
rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
struct rte_vhost_ring_inflight *vring)
{
struct virtio_net *dev;
struct vhost_virtqueue *vq;
dev = get_device(vid);
if (unlikely(!dev))
return -1;
if (vring_idx >= VHOST_MAX_VRING)
return -1;
vq = dev->virtqueue[vring_idx];
if (unlikely(!vq))
return -1;
if (vq_is_packed(dev)) {
if (unlikely(!vq->inflight_packed))
return -1;
vring->inflight_packed = vq->inflight_packed;
} else {
if (unlikely(!vq->inflight_split))
return -1;
vring->inflight_split = vq->inflight_split;
}
vring->resubmit_inflight = vq->resubmit_inflight;
return 0;
}
int
rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
uint16_t idx)
{
struct vhost_virtqueue *vq;
struct virtio_net *dev;
dev = get_device(vid);
if (unlikely(!dev))
return -1;
if (unlikely(!(dev->protocol_features &
(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
return 0;
if (unlikely(vq_is_packed(dev)))
return -1;
if (unlikely(vring_idx >= VHOST_MAX_VRING))
return -1;
vq = dev->virtqueue[vring_idx];
if (unlikely(!vq))
return -1;
if (unlikely(!vq->inflight_split))
return -1;
if (unlikely(idx >= vq->size))
return -1;