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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 <stdint.h>
#include <stdlib.h>
#include <pthread.h>
#ifdef RTE_LIBRTE_VHOST_NUMA
#include <numa.h>
#include <numaif.h>
#endif
#include <rte_errno.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include "iotlb.h"
#include "vhost.h"
#include "vhost_user.h"
struct virtio_net *vhost_devices[RTE_MAX_VHOST_DEVICE];
pthread_mutex_t vhost_dev_lock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t vhost_dma_lock = PTHREAD_MUTEX_INITIALIZER;
struct vhost_vq_stats_name_off {
char name[RTE_VHOST_STATS_NAME_SIZE];
unsigned int offset;
};
static const struct vhost_vq_stats_name_off vhost_vq_stat_strings[] = {
{"good_packets", offsetof(struct vhost_virtqueue, stats.packets)},
{"good_bytes", offsetof(struct vhost_virtqueue, stats.bytes)},
{"multicast_packets", offsetof(struct vhost_virtqueue, stats.multicast)},
{"broadcast_packets", offsetof(struct vhost_virtqueue, stats.broadcast)},
{"undersize_packets", offsetof(struct vhost_virtqueue, stats.size_bins[0])},
{"size_64_packets", offsetof(struct vhost_virtqueue, stats.size_bins[1])},
{"size_65_127_packets", offsetof(struct vhost_virtqueue, stats.size_bins[2])},
{"size_128_255_packets", offsetof(struct vhost_virtqueue, stats.size_bins[3])},
{"size_256_511_packets", offsetof(struct vhost_virtqueue, stats.size_bins[4])},
{"size_512_1023_packets", offsetof(struct vhost_virtqueue, stats.size_bins[5])},
{"size_1024_1518_packets", offsetof(struct vhost_virtqueue, stats.size_bins[6])},
{"size_1519_max_packets", offsetof(struct vhost_virtqueue, stats.size_bins[7])},
{"guest_notifications", offsetof(struct vhost_virtqueue, stats.guest_notifications)},
{"guest_notifications_offloaded", offsetof(struct vhost_virtqueue,
stats.guest_notifications_offloaded)},
{"guest_notifications_error", offsetof(struct vhost_virtqueue,
stats.guest_notifications_error)},
{"guest_notifications_suppressed", offsetof(struct vhost_virtqueue,
stats.guest_notifications_suppressed)},
{"iotlb_hits", offsetof(struct vhost_virtqueue, stats.iotlb_hits)},
{"iotlb_misses", offsetof(struct vhost_virtqueue, stats.iotlb_misses)},
{"inflight_submitted", offsetof(struct vhost_virtqueue, stats.inflight_submitted)},
{"inflight_completed", offsetof(struct vhost_virtqueue, stats.inflight_completed)},
{"mbuf_alloc_failed", offsetof(struct vhost_virtqueue, stats.mbuf_alloc_failed)},
};
#define VHOST_NB_VQ_STATS RTE_DIM(vhost_vq_stat_strings)
static int
vhost_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
{
return dev->backend_ops->iotlb_miss(dev, iova, perm);
}
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(dev, iova, &tmp_size, perm);
if (tmp_size == *size) {
if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
vq->stats.iotlb_hits++;
return vva;
}
if (dev->flags & VIRTIO_DEV_STATS_ENABLED)
vq->stats.iotlb_misses++;
iova += tmp_size;
if (!vhost_user_iotlb_pending_miss(dev, 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(dev, iova, perm);
if (vhost_iotlb_miss(dev, iova, perm)) {
VHOST_DATA_LOG(dev->ifname, ERR,
"IOTLB miss req failed for IOVA 0x%" PRIx64,
iova);
vhost_user_iotlb_pending_remove(dev, iova, 1, perm);
}
vhost_user_iotlb_rd_lock(vq);
}
tmp_size = *size;
/* Retry in case of VDUSE, as it is synchronous */
vva = vhost_user_iotlb_cache_find(dev, iova, &tmp_size, perm);
if (tmp_size == *size)
return vva;
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 rte_atomic_ ones
* are sub-optimized in older GCC versions.
*/
__sync_fetch_and_or_1(addr, (1U << nr));
#else
rte_atomic_fetch_or_explicit((volatile uint8_t __rte_atomic *)addr, (1U << nr),
rte_memory_order_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_atomic_thread_fence(rte_memory_order_release);
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_DATA_LOG(dev->ifname, ERR,
"failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found",
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;
/* No cache, nothing to sync */
if (unlikely(!vq->log_cache))
return;
rte_atomic_thread_fence(rte_memory_order_release);
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 'rte_atomic' ones
* are sub-optimized in older GCC versions.
*/
__sync_fetch_and_or(log_base + elem->offset, elem->val);
#else
rte_atomic_fetch_or_explicit(
(unsigned long __rte_atomic *)(log_base + elem->offset),
elem->val, rte_memory_order_relaxed);
#endif
}
rte_atomic_thread_fence(rte_memory_order_release);
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;
if (unlikely(!vq->log_cache)) {
/* No logging cache allocated, write dirty log map directly */
rte_atomic_thread_fence(rte_memory_order_release);
vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
return;
}
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_atomic_thread_fence(rte_memory_order_release);
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_DATA_LOG(dev->ifname, ERR,
"failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found",
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_socket(__func__, desc_len, 0, vq->numa_node);
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) {
rte_free(vq->resubmit_inflight->resubmit_list);
vq->resubmit_inflight->resubmit_list = NULL;
}
rte_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)
__rte_exclusive_locks_required(&vq->access_lock)
{
if (!vq->async)
return;
rte_free(vq->async->pkts_info);
rte_free(vq->async->pkts_cmpl_flag);
rte_free(vq->async->buffers_packed);
vq->async->buffers_packed = NULL;
rte_free(vq->async->descs_split);
vq->async->descs_split = NULL;
rte_free(vq->async);
vq->async = 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);
rte_rwlock_write_lock(&vq->access_lock);
vhost_free_async_mem(vq);
rte_rwlock_write_unlock(&vq->access_lock);
rte_free(vq->batch_copy_elems);
rte_free(vq->log_cache);
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)
__rte_shared_locks_required(&vq->iotlb_lock)
{
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
*/
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_DATA_LOG(dev->ifname, ERR,
"failed to find GPA for log_addr: 0x%"
PRIx64 " hva: 0x%" PRIx64,
log_addr, hva);
return 0;
}
return gpa;
} else
return log_addr;
}
static int
vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
__rte_shared_locks_required(&vq->iotlb_lock)
{
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;
}
static int
vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
__rte_shared_locks_required(&vq->iotlb_lock)
{
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 = true;
return 0;
}
void
vring_invalidate(struct virtio_net *dev __rte_unused, struct vhost_virtqueue *vq)
{
vhost_user_iotlb_wr_lock(vq);
vq->access_ok = false;
vq->desc = NULL;
vq->avail = NULL;
vq->used = NULL;
vq->log_guest_addr = 0;
vhost_user_iotlb_wr_unlock(vq);
}
static void
init_vring_queue(struct virtio_net *dev __rte_unused, struct vhost_virtqueue *vq,
uint32_t vring_idx)
{
int numa_node = SOCKET_ID_ANY;
memset(vq, 0, sizeof(struct vhost_virtqueue));
vq->index = vring_idx;
vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
vq->notif_enable = VIRTIO_UNINITIALIZED_NOTIF;
#ifdef RTE_LIBRTE_VHOST_NUMA
if (get_mempolicy(&numa_node, NULL, 0, vq, MPOL_F_NODE | MPOL_F_ADDR)) {
VHOST_CONFIG_LOG(dev->ifname, ERR, "failed to query numa node: %s",
rte_strerror(errno));
numa_node = SOCKET_ID_ANY;
}
#endif
vq->numa_node = numa_node;
}
static void
reset_vring_queue(struct virtio_net *dev, struct vhost_virtqueue *vq)
{
int callfd;
callfd = vq->callfd;
init_vring_queue(dev, vq, vq->index);
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_CONFIG_LOG(dev->ifname, ERR,
"failed to allocate memory for vring %u.",
i);
return -1;
}
dev->virtqueue[i] = vq;
init_vring_queue(dev, vq, i);
rte_rwlock_init(&vq->access_lock);
rte_rwlock_init(&vq->iotlb_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++) {
struct vhost_virtqueue *vq = dev->virtqueue[i];
if (!vq) {
VHOST_CONFIG_LOG(dev->ifname, ERR,
"failed to reset vring, virtqueue not allocated (%d)", i);
continue;
}
reset_vring_queue(dev, vq);
}
}
/*
* Invoked when there is a new vhost-user connection established (when
* there is a new virtio device being attached).
*/
int
vhost_new_device(struct vhost_backend_ops *ops)
{
struct virtio_net *dev;
int i;
if (ops == NULL) {
VHOST_CONFIG_LOG("device", ERR, "missing backend ops.");
return -1;
}
if (ops->iotlb_miss == NULL) {
VHOST_CONFIG_LOG("device", ERR, "missing IOTLB miss backend op.");
return -1;
}
if (ops->inject_irq == NULL) {
VHOST_CONFIG_LOG("device", ERR, "missing IRQ injection backend op.");
return -1;
}
pthread_mutex_lock(&vhost_dev_lock);
for (i = 0; i < RTE_MAX_VHOST_DEVICE; i++) {
if (vhost_devices[i] == NULL)
break;
}
if (i == RTE_MAX_VHOST_DEVICE) {
VHOST_CONFIG_LOG("device", ERR, "failed to find a free slot for new device.");
pthread_mutex_unlock(&vhost_dev_lock);
return -1;
}
dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
if (dev == NULL) {
VHOST_CONFIG_LOG("device", ERR, "failed to allocate memory for new device.");
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->backend_req_fd = -1;
dev->postcopy_ufd = -1;
rte_spinlock_init(&dev->backend_req_lock);
dev->backend_ops = ops;
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_setup_virtio_net(int vid, bool enable, bool compliant_ol_flags, bool stats_enabled,
bool support_iommu)
{
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;
if (!compliant_ol_flags)
dev->flags |= VIRTIO_DEV_LEGACY_OL_FLAGS;
else
dev->flags &= ~VIRTIO_DEV_LEGACY_OL_FLAGS;
if (stats_enabled)
dev->flags |= VIRTIO_DEV_STATS_ENABLED;
else
dev->flags &= ~VIRTIO_DEV_STATS_ENABLED;
if (support_iommu)
dev->flags |= VIRTIO_DEV_SUPPORT_IOMMU;
else
dev->flags &= ~VIRTIO_DEV_SUPPORT_IOMMU;
if (vhost_user_iotlb_init(dev) < 0)
VHOST_CONFIG_LOG("device", ERR, "failed to init IOTLB");
}
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_CONFIG_LOG(dev->ifname, ERR, "failed to query numa node: %s",
rte_strerror(errno));
return -1;
}
return numa_node;
#else
RTE_SET_USED(vid);
return -1;
#endif
}
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_negotiated_protocol_features(int vid,
uint64_t *protocol_features)
{
struct virtio_net *dev;
dev = get_device(vid);
if (dev == NULL || protocol_features == NULL)
return -1;
*protocol_features = dev->protocol_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;