1376 lines
34 KiB
C
1376 lines
34 KiB
C
/*
|
|
* VDUSE (vDPA Device in Userspace) library
|
|
*
|
|
* Copyright (C) 2022 Bytedance Inc. and/or its affiliates. All rights reserved.
|
|
* Portions of codes and concepts borrowed from libvhost-user.c, so:
|
|
* Copyright IBM, Corp. 2007
|
|
* Copyright (c) 2016 Red Hat, Inc.
|
|
*
|
|
* Author:
|
|
* Xie Yongji <xieyongji@bytedance.com>
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Marc-André Lureau <mlureau@redhat.com>
|
|
* Victor Kaplansky <victork@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* later. See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <endian.h>
|
|
#include <unistd.h>
|
|
#include <limits.h>
|
|
#include <fcntl.h>
|
|
#include <inttypes.h>
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <sys/eventfd.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include "include/atomic.h"
|
|
#include "linux-headers/linux/virtio_ring.h"
|
|
#include "linux-headers/linux/virtio_config.h"
|
|
#include "linux-headers/linux/vduse.h"
|
|
#include "libvduse.h"
|
|
|
|
#define VDUSE_VQ_ALIGN 4096
|
|
#define MAX_IOVA_REGIONS 256
|
|
|
|
#define LOG_ALIGNMENT 64
|
|
|
|
/* Round number down to multiple */
|
|
#define ALIGN_DOWN(n, m) ((n) / (m) * (m))
|
|
|
|
/* Round number up to multiple */
|
|
#define ALIGN_UP(n, m) ALIGN_DOWN((n) + (m) - 1, (m))
|
|
|
|
#ifndef unlikely
|
|
#define unlikely(x) __builtin_expect(!!(x), 0)
|
|
#endif
|
|
|
|
typedef struct VduseDescStateSplit {
|
|
uint8_t inflight;
|
|
uint8_t padding[5];
|
|
uint16_t next;
|
|
uint64_t counter;
|
|
} VduseDescStateSplit;
|
|
|
|
typedef struct VduseVirtqLogInflight {
|
|
uint64_t features;
|
|
uint16_t version;
|
|
uint16_t desc_num;
|
|
uint16_t last_batch_head;
|
|
uint16_t used_idx;
|
|
VduseDescStateSplit desc[];
|
|
} VduseVirtqLogInflight;
|
|
|
|
typedef struct VduseVirtqLog {
|
|
VduseVirtqLogInflight inflight;
|
|
} VduseVirtqLog;
|
|
|
|
typedef struct VduseVirtqInflightDesc {
|
|
uint16_t index;
|
|
uint64_t counter;
|
|
} VduseVirtqInflightDesc;
|
|
|
|
typedef struct VduseRing {
|
|
unsigned int num;
|
|
uint64_t desc_addr;
|
|
uint64_t avail_addr;
|
|
uint64_t used_addr;
|
|
struct vring_desc *desc;
|
|
struct vring_avail *avail;
|
|
struct vring_used *used;
|
|
} VduseRing;
|
|
|
|
struct VduseVirtq {
|
|
VduseRing vring;
|
|
uint16_t last_avail_idx;
|
|
uint16_t shadow_avail_idx;
|
|
uint16_t used_idx;
|
|
uint16_t signalled_used;
|
|
bool signalled_used_valid;
|
|
int index;
|
|
int inuse;
|
|
bool ready;
|
|
int fd;
|
|
VduseDev *dev;
|
|
VduseVirtqInflightDesc *resubmit_list;
|
|
uint16_t resubmit_num;
|
|
uint64_t counter;
|
|
VduseVirtqLog *log;
|
|
};
|
|
|
|
typedef struct VduseIovaRegion {
|
|
uint64_t iova;
|
|
uint64_t size;
|
|
uint64_t mmap_offset;
|
|
uint64_t mmap_addr;
|
|
} VduseIovaRegion;
|
|
|
|
struct VduseDev {
|
|
VduseVirtq *vqs;
|
|
VduseIovaRegion regions[MAX_IOVA_REGIONS];
|
|
int num_regions;
|
|
char *name;
|
|
uint32_t device_id;
|
|
uint32_t vendor_id;
|
|
uint16_t num_queues;
|
|
uint16_t queue_size;
|
|
uint64_t features;
|
|
const VduseOps *ops;
|
|
int fd;
|
|
int ctrl_fd;
|
|
void *priv;
|
|
void *log;
|
|
};
|
|
|
|
static inline size_t vduse_vq_log_size(uint16_t queue_size)
|
|
{
|
|
return ALIGN_UP(sizeof(VduseDescStateSplit) * queue_size +
|
|
sizeof(VduseVirtqLogInflight), LOG_ALIGNMENT);
|
|
}
|
|
|
|
static void *vduse_log_get(const char *filename, size_t size)
|
|
{
|
|
void *ptr = MAP_FAILED;
|
|
int fd;
|
|
|
|
fd = open(filename, O_RDWR | O_CREAT, 0600);
|
|
if (fd == -1) {
|
|
return MAP_FAILED;
|
|
}
|
|
|
|
if (ftruncate(fd, size) == -1) {
|
|
goto out;
|
|
}
|
|
|
|
ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
|
|
|
out:
|
|
close(fd);
|
|
return ptr;
|
|
}
|
|
|
|
static inline bool has_feature(uint64_t features, unsigned int fbit)
|
|
{
|
|
assert(fbit < 64);
|
|
return !!(features & (1ULL << fbit));
|
|
}
|
|
|
|
static inline bool vduse_dev_has_feature(VduseDev *dev, unsigned int fbit)
|
|
{
|
|
return has_feature(dev->features, fbit);
|
|
}
|
|
|
|
uint64_t vduse_get_virtio_features(void)
|
|
{
|
|
return (1ULL << VIRTIO_F_IOMMU_PLATFORM) |
|
|
(1ULL << VIRTIO_F_VERSION_1) |
|
|
(1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) |
|
|
(1ULL << VIRTIO_RING_F_EVENT_IDX) |
|
|
(1ULL << VIRTIO_RING_F_INDIRECT_DESC);
|
|
}
|
|
|
|
VduseDev *vduse_queue_get_dev(VduseVirtq *vq)
|
|
{
|
|
return vq->dev;
|
|
}
|
|
|
|
int vduse_queue_get_fd(VduseVirtq *vq)
|
|
{
|
|
return vq->fd;
|
|
}
|
|
|
|
void *vduse_dev_get_priv(VduseDev *dev)
|
|
{
|
|
return dev->priv;
|
|
}
|
|
|
|
VduseVirtq *vduse_dev_get_queue(VduseDev *dev, int index)
|
|
{
|
|
return &dev->vqs[index];
|
|
}
|
|
|
|
int vduse_dev_get_fd(VduseDev *dev)
|
|
{
|
|
return dev->fd;
|
|
}
|
|
|
|
static int vduse_inject_irq(VduseDev *dev, int index)
|
|
{
|
|
return ioctl(dev->fd, VDUSE_VQ_INJECT_IRQ, &index);
|
|
}
|
|
|
|
static int inflight_desc_compare(const void *a, const void *b)
|
|
{
|
|
VduseVirtqInflightDesc *desc0 = (VduseVirtqInflightDesc *)a,
|
|
*desc1 = (VduseVirtqInflightDesc *)b;
|
|
|
|
if (desc1->counter > desc0->counter &&
|
|
(desc1->counter - desc0->counter) < VIRTQUEUE_MAX_SIZE * 2) {
|
|
return 1;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int vduse_queue_check_inflights(VduseVirtq *vq)
|
|
{
|
|
int i = 0;
|
|
VduseDev *dev = vq->dev;
|
|
|
|
vq->used_idx = le16toh(vq->vring.used->idx);
|
|
vq->resubmit_num = 0;
|
|
vq->resubmit_list = NULL;
|
|
vq->counter = 0;
|
|
|
|
if (unlikely(vq->log->inflight.used_idx != vq->used_idx)) {
|
|
if (vq->log->inflight.last_batch_head > VIRTQUEUE_MAX_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
vq->log->inflight.desc[vq->log->inflight.last_batch_head].inflight = 0;
|
|
|
|
barrier();
|
|
|
|
vq->log->inflight.used_idx = vq->used_idx;
|
|
}
|
|
|
|
for (i = 0; i < vq->log->inflight.desc_num; i++) {
|
|
if (vq->log->inflight.desc[i].inflight == 1) {
|
|
vq->inuse++;
|
|
}
|
|
}
|
|
|
|
vq->shadow_avail_idx = vq->last_avail_idx = vq->inuse + vq->used_idx;
|
|
|
|
if (vq->inuse) {
|
|
vq->resubmit_list = calloc(vq->inuse, sizeof(VduseVirtqInflightDesc));
|
|
if (!vq->resubmit_list) {
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < vq->log->inflight.desc_num; i++) {
|
|
if (vq->log->inflight.desc[i].inflight) {
|
|
vq->resubmit_list[vq->resubmit_num].index = i;
|
|
vq->resubmit_list[vq->resubmit_num].counter =
|
|
vq->log->inflight.desc[i].counter;
|
|
vq->resubmit_num++;
|
|
}
|
|
}
|
|
|
|
if (vq->resubmit_num > 1) {
|
|
qsort(vq->resubmit_list, vq->resubmit_num,
|
|
sizeof(VduseVirtqInflightDesc), inflight_desc_compare);
|
|
}
|
|
vq->counter = vq->resubmit_list[0].counter + 1;
|
|
}
|
|
|
|
vduse_inject_irq(dev, vq->index);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vduse_queue_inflight_get(VduseVirtq *vq, int desc_idx)
|
|
{
|
|
vq->log->inflight.desc[desc_idx].counter = vq->counter++;
|
|
|
|
barrier();
|
|
|
|
vq->log->inflight.desc[desc_idx].inflight = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vduse_queue_inflight_pre_put(VduseVirtq *vq, int desc_idx)
|
|
{
|
|
vq->log->inflight.last_batch_head = desc_idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vduse_queue_inflight_post_put(VduseVirtq *vq, int desc_idx)
|
|
{
|
|
vq->log->inflight.desc[desc_idx].inflight = 0;
|
|
|
|
barrier();
|
|
|
|
vq->log->inflight.used_idx = vq->used_idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vduse_iova_remove_region(VduseDev *dev, uint64_t start,
|
|
uint64_t last)
|
|
{
|
|
int i;
|
|
|
|
if (last == start) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < MAX_IOVA_REGIONS; i++) {
|
|
if (!dev->regions[i].mmap_addr) {
|
|
continue;
|
|
}
|
|
|
|
if (start <= dev->regions[i].iova &&
|
|
last >= (dev->regions[i].iova + dev->regions[i].size - 1)) {
|
|
munmap((void *)(uintptr_t)dev->regions[i].mmap_addr,
|
|
dev->regions[i].mmap_offset + dev->regions[i].size);
|
|
dev->regions[i].mmap_addr = 0;
|
|
dev->num_regions--;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int vduse_iova_add_region(VduseDev *dev, int fd,
|
|
uint64_t offset, uint64_t start,
|
|
uint64_t last, int prot)
|
|
{
|
|
int i;
|
|
uint64_t size = last - start + 1;
|
|
void *mmap_addr = mmap(0, size + offset, prot, MAP_SHARED, fd, 0);
|
|
|
|
if (mmap_addr == MAP_FAILED) {
|
|
close(fd);
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < MAX_IOVA_REGIONS; i++) {
|
|
if (!dev->regions[i].mmap_addr) {
|
|
dev->regions[i].mmap_addr = (uint64_t)(uintptr_t)mmap_addr;
|
|
dev->regions[i].mmap_offset = offset;
|
|
dev->regions[i].iova = start;
|
|
dev->regions[i].size = size;
|
|
dev->num_regions++;
|
|
break;
|
|
}
|
|
}
|
|
assert(i < MAX_IOVA_REGIONS);
|
|
close(fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int perm_to_prot(uint8_t perm)
|
|
{
|
|
int prot = 0;
|
|
|
|
switch (perm) {
|
|
case VDUSE_ACCESS_WO:
|
|
prot |= PROT_WRITE;
|
|
break;
|
|
case VDUSE_ACCESS_RO:
|
|
prot |= PROT_READ;
|
|
break;
|
|
case VDUSE_ACCESS_RW:
|
|
prot |= PROT_READ | PROT_WRITE;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return prot;
|
|
}
|
|
|
|
static inline void *iova_to_va(VduseDev *dev, uint64_t *plen, uint64_t iova)
|
|
{
|
|
int i, ret;
|
|
struct vduse_iotlb_entry entry;
|
|
|
|
for (i = 0; i < MAX_IOVA_REGIONS; i++) {
|
|
VduseIovaRegion *r = &dev->regions[i];
|
|
|
|
if (!r->mmap_addr) {
|
|
continue;
|
|
}
|
|
|
|
if ((iova >= r->iova) && (iova < (r->iova + r->size))) {
|
|
if ((iova + *plen) > (r->iova + r->size)) {
|
|
*plen = r->iova + r->size - iova;
|
|
}
|
|
return (void *)(uintptr_t)(iova - r->iova +
|
|
r->mmap_addr + r->mmap_offset);
|
|
}
|
|
}
|
|
|
|
entry.start = iova;
|
|
entry.last = iova + 1;
|
|
ret = ioctl(dev->fd, VDUSE_IOTLB_GET_FD, &entry);
|
|
if (ret < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
if (!vduse_iova_add_region(dev, ret, entry.offset, entry.start,
|
|
entry.last, perm_to_prot(entry.perm))) {
|
|
return iova_to_va(dev, plen, iova);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline uint16_t vring_avail_flags(VduseVirtq *vq)
|
|
{
|
|
return le16toh(vq->vring.avail->flags);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_idx(VduseVirtq *vq)
|
|
{
|
|
vq->shadow_avail_idx = le16toh(vq->vring.avail->idx);
|
|
|
|
return vq->shadow_avail_idx;
|
|
}
|
|
|
|
static inline uint16_t vring_avail_ring(VduseVirtq *vq, int i)
|
|
{
|
|
return le16toh(vq->vring.avail->ring[i]);
|
|
}
|
|
|
|
static inline uint16_t vring_get_used_event(VduseVirtq *vq)
|
|
{
|
|
return vring_avail_ring(vq, vq->vring.num);
|
|
}
|
|
|
|
static bool vduse_queue_get_head(VduseVirtq *vq, unsigned int idx,
|
|
unsigned int *head)
|
|
{
|
|
/*
|
|
* Grab the next descriptor number they're advertising, and increment
|
|
* the index we've seen.
|
|
*/
|
|
*head = vring_avail_ring(vq, idx % vq->vring.num);
|
|
|
|
/* If their number is silly, that's a fatal mistake. */
|
|
if (*head >= vq->vring.num) {
|
|
fprintf(stderr, "Guest says index %u is available\n", *head);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int
|
|
vduse_queue_read_indirect_desc(VduseDev *dev, struct vring_desc *desc,
|
|
uint64_t addr, size_t len)
|
|
{
|
|
struct vring_desc *ori_desc;
|
|
uint64_t read_len;
|
|
|
|
if (len > (VIRTQUEUE_MAX_SIZE * sizeof(struct vring_desc))) {
|
|
return -1;
|
|
}
|
|
|
|
if (len == 0) {
|
|
return -1;
|
|
}
|
|
|
|
while (len) {
|
|
read_len = len;
|
|
ori_desc = iova_to_va(dev, &read_len, addr);
|
|
if (!ori_desc) {
|
|
return -1;
|
|
}
|
|
|
|
memcpy(desc, ori_desc, read_len);
|
|
len -= read_len;
|
|
addr += read_len;
|
|
desc += read_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
enum {
|
|
VIRTQUEUE_READ_DESC_ERROR = -1,
|
|
VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */
|
|
VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */
|
|
};
|
|
|
|
static int vduse_queue_read_next_desc(struct vring_desc *desc, int i,
|
|
unsigned int max, unsigned int *next)
|
|
{
|
|
/* If this descriptor says it doesn't chain, we're done. */
|
|
if (!(le16toh(desc[i].flags) & VRING_DESC_F_NEXT)) {
|
|
return VIRTQUEUE_READ_DESC_DONE;
|
|
}
|
|
|
|
/* Check they're not leading us off end of descriptors. */
|
|
*next = desc[i].next;
|
|
/* Make sure compiler knows to grab that: we don't want it changing! */
|
|
smp_wmb();
|
|
|
|
if (*next >= max) {
|
|
fprintf(stderr, "Desc next is %u\n", *next);
|
|
return VIRTQUEUE_READ_DESC_ERROR;
|
|
}
|
|
|
|
return VIRTQUEUE_READ_DESC_MORE;
|
|
}
|
|
|
|
/*
|
|
* Fetch avail_idx from VQ memory only when we really need to know if
|
|
* guest has added some buffers.
|
|
*/
|
|
static bool vduse_queue_empty(VduseVirtq *vq)
|
|
{
|
|
if (unlikely(!vq->vring.avail)) {
|
|
return true;
|
|
}
|
|
|
|
if (vq->shadow_avail_idx != vq->last_avail_idx) {
|
|
return false;
|
|
}
|
|
|
|
return vring_avail_idx(vq) == vq->last_avail_idx;
|
|
}
|
|
|
|
static bool vduse_queue_should_notify(VduseVirtq *vq)
|
|
{
|
|
VduseDev *dev = vq->dev;
|
|
uint16_t old, new;
|
|
bool v;
|
|
|
|
/* We need to expose used array entries before checking used event. */
|
|
smp_mb();
|
|
|
|
/* Always notify when queue is empty (when feature acknowledge) */
|
|
if (vduse_dev_has_feature(dev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
|
|
!vq->inuse && vduse_queue_empty(vq)) {
|
|
return true;
|
|
}
|
|
|
|
if (!vduse_dev_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
|
}
|
|
|
|
v = vq->signalled_used_valid;
|
|
vq->signalled_used_valid = true;
|
|
old = vq->signalled_used;
|
|
new = vq->signalled_used = vq->used_idx;
|
|
return !v || vring_need_event(vring_get_used_event(vq), new, old);
|
|
}
|
|
|
|
void vduse_queue_notify(VduseVirtq *vq)
|
|
{
|
|
VduseDev *dev = vq->dev;
|
|
|
|
if (unlikely(!vq->vring.avail)) {
|
|
return;
|
|
}
|
|
|
|
if (!vduse_queue_should_notify(vq)) {
|
|
return;
|
|
}
|
|
|
|
if (vduse_inject_irq(dev, vq->index) < 0) {
|
|
fprintf(stderr, "Error inject irq for vq %d: %s\n",
|
|
vq->index, strerror(errno));
|
|
}
|
|
}
|
|
|
|
static inline void vring_set_avail_event(VduseVirtq *vq, uint16_t val)
|
|
{
|
|
*((uint16_t *)&vq->vring.used->ring[vq->vring.num]) = htole16(val);
|
|
}
|
|
|
|
static bool vduse_queue_map_single_desc(VduseVirtq *vq, unsigned int *p_num_sg,
|
|
struct iovec *iov, unsigned int max_num_sg,
|
|
bool is_write, uint64_t pa, size_t sz)
|
|
{
|
|
unsigned num_sg = *p_num_sg;
|
|
VduseDev *dev = vq->dev;
|
|
|
|
assert(num_sg <= max_num_sg);
|
|
|
|
if (!sz) {
|
|
fprintf(stderr, "virtio: zero sized buffers are not allowed\n");
|
|
return false;
|
|
}
|
|
|
|
while (sz) {
|
|
uint64_t len = sz;
|
|
|
|
if (num_sg == max_num_sg) {
|
|
fprintf(stderr,
|
|
"virtio: too many descriptors in indirect table\n");
|
|
return false;
|
|
}
|
|
|
|
iov[num_sg].iov_base = iova_to_va(dev, &len, pa);
|
|
if (iov[num_sg].iov_base == NULL) {
|
|
fprintf(stderr, "virtio: invalid address for buffers\n");
|
|
return false;
|
|
}
|
|
iov[num_sg++].iov_len = len;
|
|
sz -= len;
|
|
pa += len;
|
|
}
|
|
|
|
*p_num_sg = num_sg;
|
|
return true;
|
|
}
|
|
|
|
static void *vduse_queue_alloc_element(size_t sz, unsigned out_num,
|
|
unsigned in_num)
|
|
{
|
|
VduseVirtqElement *elem;
|
|
size_t in_sg_ofs = ALIGN_UP(sz, __alignof__(elem->in_sg[0]));
|
|
size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]);
|
|
size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]);
|
|
|
|
assert(sz >= sizeof(VduseVirtqElement));
|
|
elem = malloc(out_sg_end);
|
|
if (!elem) {
|
|
return NULL;
|
|
}
|
|
elem->out_num = out_num;
|
|
elem->in_num = in_num;
|
|
elem->in_sg = (void *)elem + in_sg_ofs;
|
|
elem->out_sg = (void *)elem + out_sg_ofs;
|
|
return elem;
|
|
}
|
|
|
|
static void *vduse_queue_map_desc(VduseVirtq *vq, unsigned int idx, size_t sz)
|
|
{
|
|
struct vring_desc *desc = vq->vring.desc;
|
|
VduseDev *dev = vq->dev;
|
|
uint64_t desc_addr, read_len;
|
|
unsigned int desc_len;
|
|
unsigned int max = vq->vring.num;
|
|
unsigned int i = idx;
|
|
VduseVirtqElement *elem;
|
|
struct iovec iov[VIRTQUEUE_MAX_SIZE];
|
|
struct vring_desc desc_buf[VIRTQUEUE_MAX_SIZE];
|
|
unsigned int out_num = 0, in_num = 0;
|
|
int rc;
|
|
|
|
if (le16toh(desc[i].flags) & VRING_DESC_F_INDIRECT) {
|
|
if (le32toh(desc[i].len) % sizeof(struct vring_desc)) {
|
|
fprintf(stderr, "Invalid size for indirect buffer table\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* loop over the indirect descriptor table */
|
|
desc_addr = le64toh(desc[i].addr);
|
|
desc_len = le32toh(desc[i].len);
|
|
max = desc_len / sizeof(struct vring_desc);
|
|
read_len = desc_len;
|
|
desc = iova_to_va(dev, &read_len, desc_addr);
|
|
if (unlikely(desc && read_len != desc_len)) {
|
|
/* Failed to use zero copy */
|
|
desc = NULL;
|
|
if (!vduse_queue_read_indirect_desc(dev, desc_buf,
|
|
desc_addr,
|
|
desc_len)) {
|
|
desc = desc_buf;
|
|
}
|
|
}
|
|
if (!desc) {
|
|
fprintf(stderr, "Invalid indirect buffer table\n");
|
|
return NULL;
|
|
}
|
|
i = 0;
|
|
}
|
|
|
|
/* Collect all the descriptors */
|
|
do {
|
|
if (le16toh(desc[i].flags) & VRING_DESC_F_WRITE) {
|
|
if (!vduse_queue_map_single_desc(vq, &in_num, iov + out_num,
|
|
VIRTQUEUE_MAX_SIZE - out_num,
|
|
true, le64toh(desc[i].addr),
|
|
le32toh(desc[i].len))) {
|
|
return NULL;
|
|
}
|
|
} else {
|
|
if (in_num) {
|
|
fprintf(stderr, "Incorrect order for descriptors\n");
|
|
return NULL;
|
|
}
|
|
if (!vduse_queue_map_single_desc(vq, &out_num, iov,
|
|
VIRTQUEUE_MAX_SIZE, false,
|
|
le64toh(desc[i].addr),
|
|
le32toh(desc[i].len))) {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if ((in_num + out_num) > max) {
|
|
fprintf(stderr, "Looped descriptor\n");
|
|
return NULL;
|
|
}
|
|
rc = vduse_queue_read_next_desc(desc, i, max, &i);
|
|
} while (rc == VIRTQUEUE_READ_DESC_MORE);
|
|
|
|
if (rc == VIRTQUEUE_READ_DESC_ERROR) {
|
|
fprintf(stderr, "read descriptor error\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* Now copy what we have collected and mapped */
|
|
elem = vduse_queue_alloc_element(sz, out_num, in_num);
|
|
if (!elem) {
|
|
fprintf(stderr, "read descriptor error\n");
|
|
return NULL;
|
|
}
|
|
elem->index = idx;
|
|
for (i = 0; i < out_num; i++) {
|
|
elem->out_sg[i] = iov[i];
|
|
}
|
|
for (i = 0; i < in_num; i++) {
|
|
elem->in_sg[i] = iov[out_num + i];
|
|
}
|
|
|
|
return elem;
|
|
}
|
|
|
|
void *vduse_queue_pop(VduseVirtq *vq, size_t sz)
|
|
{
|
|
unsigned int head;
|
|
VduseVirtqElement *elem;
|
|
VduseDev *dev = vq->dev;
|
|
int i;
|
|
|
|
if (unlikely(!vq->vring.avail)) {
|
|
return NULL;
|
|
}
|
|
|
|
if (unlikely(vq->resubmit_list && vq->resubmit_num > 0)) {
|
|
i = (--vq->resubmit_num);
|
|
elem = vduse_queue_map_desc(vq, vq->resubmit_list[i].index, sz);
|
|
|
|
if (!vq->resubmit_num) {
|
|
free(vq->resubmit_list);
|
|
vq->resubmit_list = NULL;
|
|
}
|
|
|
|
return elem;
|
|
}
|
|
|
|
if (vduse_queue_empty(vq)) {
|
|
return NULL;
|
|
}
|
|
/* Needed after virtio_queue_empty() */
|
|
smp_rmb();
|
|
|
|
if (vq->inuse >= vq->vring.num) {
|
|
fprintf(stderr, "Virtqueue size exceeded: %d\n", vq->inuse);
|
|
return NULL;
|
|
}
|
|
|
|
if (!vduse_queue_get_head(vq, vq->last_avail_idx++, &head)) {
|
|
return NULL;
|
|
}
|
|
|
|
if (vduse_dev_has_feature(dev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_set_avail_event(vq, vq->last_avail_idx);
|
|
}
|
|
|
|
elem = vduse_queue_map_desc(vq, head, sz);
|
|
|
|
if (!elem) {
|
|
return NULL;
|
|
}
|
|
|
|
vq->inuse++;
|
|
|
|
vduse_queue_inflight_get(vq, head);
|
|
|
|
return elem;
|
|
}
|
|
|
|
static inline void vring_used_write(VduseVirtq *vq,
|
|
struct vring_used_elem *uelem, int i)
|
|
{
|
|
struct vring_used *used = vq->vring.used;
|
|
|
|
used->ring[i] = *uelem;
|
|
}
|
|
|
|
static void vduse_queue_fill(VduseVirtq *vq, const VduseVirtqElement *elem,
|
|
unsigned int len, unsigned int idx)
|
|
{
|
|
struct vring_used_elem uelem;
|
|
|
|
if (unlikely(!vq->vring.used)) {
|
|
return;
|
|
}
|
|
|
|
idx = (idx + vq->used_idx) % vq->vring.num;
|
|
|
|
uelem.id = htole32(elem->index);
|
|
uelem.len = htole32(len);
|
|
vring_used_write(vq, &uelem, idx);
|
|
}
|
|
|
|
static inline void vring_used_idx_set(VduseVirtq *vq, uint16_t val)
|
|
{
|
|
vq->vring.used->idx = htole16(val);
|
|
vq->used_idx = val;
|
|
}
|
|
|
|
static void vduse_queue_flush(VduseVirtq *vq, unsigned int count)
|
|
{
|
|
uint16_t old, new;
|
|
|
|
if (unlikely(!vq->vring.used)) {
|
|
return;
|
|
}
|
|
|
|
/* Make sure buffer is written before we update index. */
|
|
smp_wmb();
|
|
|
|
old = vq->used_idx;
|
|
new = old + count;
|
|
vring_used_idx_set(vq, new);
|
|
vq->inuse -= count;
|
|
if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old))) {
|
|
vq->signalled_used_valid = false;
|
|
}
|
|
}
|
|
|
|
void vduse_queue_push(VduseVirtq *vq, const VduseVirtqElement *elem,
|
|
unsigned int len)
|
|
{
|
|
vduse_queue_fill(vq, elem, len, 0);
|
|
vduse_queue_inflight_pre_put(vq, elem->index);
|
|
vduse_queue_flush(vq, 1);
|
|
vduse_queue_inflight_post_put(vq, elem->index);
|
|
}
|
|
|
|
static int vduse_queue_update_vring(VduseVirtq *vq, uint64_t desc_addr,
|
|
uint64_t avail_addr, uint64_t used_addr)
|
|
{
|
|
struct VduseDev *dev = vq->dev;
|
|
uint64_t len;
|
|
|
|
len = sizeof(struct vring_desc);
|
|
vq->vring.desc = iova_to_va(dev, &len, desc_addr);
|
|
if (len != sizeof(struct vring_desc)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
len = sizeof(struct vring_avail);
|
|
vq->vring.avail = iova_to_va(dev, &len, avail_addr);
|
|
if (len != sizeof(struct vring_avail)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
len = sizeof(struct vring_used);
|
|
vq->vring.used = iova_to_va(dev, &len, used_addr);
|
|
if (len != sizeof(struct vring_used)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!vq->vring.desc || !vq->vring.avail || !vq->vring.used) {
|
|
fprintf(stderr, "Failed to get vq[%d] iova mapping\n", vq->index);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vduse_queue_enable(VduseVirtq *vq)
|
|
{
|
|
struct VduseDev *dev = vq->dev;
|
|
struct vduse_vq_info vq_info;
|
|
struct vduse_vq_eventfd vq_eventfd;
|
|
int fd;
|
|
|
|
vq_info.index = vq->index;
|
|
if (ioctl(dev->fd, VDUSE_VQ_GET_INFO, &vq_info)) {
|
|
fprintf(stderr, "Failed to get vq[%d] info: %s\n",
|
|
vq->index, strerror(errno));
|
|
return;
|
|
}
|
|
|
|
if (!vq_info.ready) {
|
|
return;
|
|
}
|
|
|
|
vq->vring.num = vq_info.num;
|
|
vq->vring.desc_addr = vq_info.desc_addr;
|
|
vq->vring.avail_addr = vq_info.driver_addr;
|
|
vq->vring.used_addr = vq_info.device_addr;
|
|
|
|
if (vduse_queue_update_vring(vq, vq_info.desc_addr,
|
|
vq_info.driver_addr, vq_info.device_addr)) {
|
|
fprintf(stderr, "Failed to update vring for vq[%d]\n", vq->index);
|
|
return;
|
|
}
|
|
|
|
fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "Failed to init eventfd for vq[%d]\n", vq->index);
|
|
return;
|
|
}
|
|
|
|
vq_eventfd.index = vq->index;
|
|
vq_eventfd.fd = fd;
|
|
if (ioctl(dev->fd, VDUSE_VQ_SETUP_KICKFD, &vq_eventfd)) {
|
|
fprintf(stderr, "Failed to setup kick fd for vq[%d]\n", vq->index);
|
|
close(fd);
|
|
return;
|
|
}
|
|
|
|
vq->fd = fd;
|
|
vq->signalled_used_valid = false;
|
|
vq->ready = true;
|
|
|
|
if (vduse_queue_check_inflights(vq)) {
|
|
fprintf(stderr, "Failed to check inflights for vq[%d]\n", vq->index);
|
|
close(fd);
|
|
return;
|
|
}
|
|
|
|
dev->ops->enable_queue(dev, vq);
|
|
}
|
|
|
|
static void vduse_queue_disable(VduseVirtq *vq)
|
|
{
|
|
struct VduseDev *dev = vq->dev;
|
|
struct vduse_vq_eventfd eventfd;
|
|
|
|
if (!vq->ready) {
|
|
return;
|
|
}
|
|
|
|
dev->ops->disable_queue(dev, vq);
|
|
|
|
eventfd.index = vq->index;
|
|
eventfd.fd = VDUSE_EVENTFD_DEASSIGN;
|
|
ioctl(dev->fd, VDUSE_VQ_SETUP_KICKFD, &eventfd);
|
|
close(vq->fd);
|
|
|
|
assert(vq->inuse == 0);
|
|
|
|
vq->vring.num = 0;
|
|
vq->vring.desc_addr = 0;
|
|
vq->vring.avail_addr = 0;
|
|
vq->vring.used_addr = 0;
|
|
vq->vring.desc = 0;
|
|
vq->vring.avail = 0;
|
|
vq->vring.used = 0;
|
|
vq->ready = false;
|
|
vq->fd = -1;
|
|
}
|
|
|
|
static void vduse_dev_start_dataplane(VduseDev *dev)
|
|
{
|
|
int i;
|
|
|
|
if (ioctl(dev->fd, VDUSE_DEV_GET_FEATURES, &dev->features)) {
|
|
fprintf(stderr, "Failed to get features: %s\n", strerror(errno));
|
|
return;
|
|
}
|
|
assert(vduse_dev_has_feature(dev, VIRTIO_F_VERSION_1));
|
|
|
|
for (i = 0; i < dev->num_queues; i++) {
|
|
vduse_queue_enable(&dev->vqs[i]);
|
|
}
|
|
}
|
|
|
|
static void vduse_dev_stop_dataplane(VduseDev *dev)
|
|
{
|
|
size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE);
|
|
int i;
|
|
|
|
for (i = 0; i < dev->num_queues; i++) {
|
|
vduse_queue_disable(&dev->vqs[i]);
|
|
}
|
|
if (dev->log) {
|
|
memset(dev->log, 0, log_size);
|
|
}
|
|
dev->features = 0;
|
|
vduse_iova_remove_region(dev, 0, ULONG_MAX);
|
|
}
|
|
|
|
int vduse_dev_handler(VduseDev *dev)
|
|
{
|
|
struct vduse_dev_request req;
|
|
struct vduse_dev_response resp = { 0 };
|
|
VduseVirtq *vq;
|
|
int i, ret;
|
|
|
|
ret = read(dev->fd, &req, sizeof(req));
|
|
if (ret != sizeof(req)) {
|
|
fprintf(stderr, "Read request error [%d]: %s\n",
|
|
ret, strerror(errno));
|
|
return -errno;
|
|
}
|
|
resp.request_id = req.request_id;
|
|
|
|
switch (req.type) {
|
|
case VDUSE_GET_VQ_STATE:
|
|
vq = &dev->vqs[req.vq_state.index];
|
|
resp.vq_state.split.avail_index = vq->last_avail_idx;
|
|
resp.result = VDUSE_REQ_RESULT_OK;
|
|
break;
|
|
case VDUSE_SET_STATUS:
|
|
if (req.s.status & VIRTIO_CONFIG_S_DRIVER_OK) {
|
|
vduse_dev_start_dataplane(dev);
|
|
} else if (req.s.status == 0) {
|
|
vduse_dev_stop_dataplane(dev);
|
|
}
|
|
resp.result = VDUSE_REQ_RESULT_OK;
|
|
break;
|
|
case VDUSE_UPDATE_IOTLB:
|
|
/* The iova will be updated by iova_to_va() later, so just remove it */
|
|
vduse_iova_remove_region(dev, req.iova.start, req.iova.last);
|
|
for (i = 0; i < dev->num_queues; i++) {
|
|
VduseVirtq *vq = &dev->vqs[i];
|
|
if (vq->ready) {
|
|
if (vduse_queue_update_vring(vq, vq->vring.desc_addr,
|
|
vq->vring.avail_addr,
|
|
vq->vring.used_addr)) {
|
|
fprintf(stderr, "Failed to update vring for vq[%d]\n",
|
|
vq->index);
|
|
}
|
|
}
|
|
}
|
|
resp.result = VDUSE_REQ_RESULT_OK;
|
|
break;
|
|
default:
|
|
resp.result = VDUSE_REQ_RESULT_FAILED;
|
|
break;
|
|
}
|
|
|
|
ret = write(dev->fd, &resp, sizeof(resp));
|
|
if (ret != sizeof(resp)) {
|
|
fprintf(stderr, "Write request %d error [%d]: %s\n",
|
|
req.type, ret, strerror(errno));
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int vduse_dev_update_config(VduseDev *dev, uint32_t size,
|
|
uint32_t offset, char *buffer)
|
|
{
|
|
int ret;
|
|
struct vduse_config_data *data;
|
|
|
|
data = malloc(offsetof(struct vduse_config_data, buffer) + size);
|
|
if (!data) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data->offset = offset;
|
|
data->length = size;
|
|
memcpy(data->buffer, buffer, size);
|
|
|
|
ret = ioctl(dev->fd, VDUSE_DEV_SET_CONFIG, data);
|
|
free(data);
|
|
|
|
if (ret) {
|
|
return -errno;
|
|
}
|
|
|
|
if (ioctl(dev->fd, VDUSE_DEV_INJECT_CONFIG_IRQ)) {
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vduse_dev_setup_queue(VduseDev *dev, int index, int max_size)
|
|
{
|
|
VduseVirtq *vq = &dev->vqs[index];
|
|
struct vduse_vq_config vq_config = { 0 };
|
|
|
|
if (max_size > VIRTQUEUE_MAX_SIZE) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
vq_config.index = vq->index;
|
|
vq_config.max_size = max_size;
|
|
|
|
if (ioctl(dev->fd, VDUSE_VQ_SETUP, &vq_config)) {
|
|
return -errno;
|
|
}
|
|
|
|
vduse_queue_enable(vq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int vduse_set_reconnect_log_file(VduseDev *dev, const char *filename)
|
|
{
|
|
|
|
size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE);
|
|
void *log;
|
|
int i;
|
|
|
|
dev->log = log = vduse_log_get(filename, log_size);
|
|
if (log == MAP_FAILED) {
|
|
fprintf(stderr, "Failed to get vduse log\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
for (i = 0; i < dev->num_queues; i++) {
|
|
dev->vqs[i].log = log;
|
|
dev->vqs[i].log->inflight.desc_num = VIRTQUEUE_MAX_SIZE;
|
|
log = (void *)((char *)log + vduse_vq_log_size(VIRTQUEUE_MAX_SIZE));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vduse_dev_init_vqs(VduseDev *dev, uint16_t num_queues)
|
|
{
|
|
VduseVirtq *vqs;
|
|
int i;
|
|
|
|
vqs = calloc(sizeof(VduseVirtq), num_queues);
|
|
if (!vqs) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < num_queues; i++) {
|
|
vqs[i].index = i;
|
|
vqs[i].dev = dev;
|
|
vqs[i].fd = -1;
|
|
}
|
|
dev->vqs = vqs;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vduse_dev_init(VduseDev *dev, const char *name,
|
|
uint16_t num_queues, const VduseOps *ops,
|
|
void *priv)
|
|
{
|
|
char *dev_path, *dev_name;
|
|
int ret, fd;
|
|
|
|
dev_path = malloc(strlen(name) + strlen("/dev/vduse/") + 1);
|
|
if (!dev_path) {
|
|
return -ENOMEM;
|
|
}
|
|
sprintf(dev_path, "/dev/vduse/%s", name);
|
|
|
|
fd = open(dev_path, O_RDWR);
|
|
free(dev_path);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "Failed to open vduse dev %s: %s\n",
|
|
name, strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
if (ioctl(fd, VDUSE_DEV_GET_FEATURES, &dev->features)) {
|
|
fprintf(stderr, "Failed to get features: %s\n", strerror(errno));
|
|
close(fd);
|
|
return -errno;
|
|
}
|
|
|
|
dev_name = strdup(name);
|
|
if (!dev_name) {
|
|
close(fd);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = vduse_dev_init_vqs(dev, num_queues);
|
|
if (ret) {
|
|
free(dev_name);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
dev->name = dev_name;
|
|
dev->num_queues = num_queues;
|
|
dev->fd = fd;
|
|
dev->ops = ops;
|
|
dev->priv = priv;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline bool vduse_name_is_invalid(const char *name)
|
|
{
|
|
return strlen(name) >= VDUSE_NAME_MAX || strstr(name, "..");
|
|
}
|
|
|
|
VduseDev *vduse_dev_create_by_fd(int fd, uint16_t num_queues,
|
|
const VduseOps *ops, void *priv)
|
|
{
|
|
VduseDev *dev;
|
|
int ret;
|
|
|
|
if (!ops || !ops->enable_queue || !ops->disable_queue) {
|
|
fprintf(stderr, "Invalid parameter for vduse\n");
|
|
return NULL;
|
|
}
|
|
|
|
dev = calloc(sizeof(VduseDev), 1);
|
|
if (!dev) {
|
|
fprintf(stderr, "Failed to allocate vduse device\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (ioctl(fd, VDUSE_DEV_GET_FEATURES, &dev->features)) {
|
|
fprintf(stderr, "Failed to get features: %s\n", strerror(errno));
|
|
free(dev);
|
|
return NULL;
|
|
}
|
|
|
|
ret = vduse_dev_init_vqs(dev, num_queues);
|
|
if (ret) {
|
|
fprintf(stderr, "Failed to init vqs\n");
|
|
free(dev);
|
|
return NULL;
|
|
}
|
|
|
|
dev->num_queues = num_queues;
|
|
dev->fd = fd;
|
|
dev->ops = ops;
|
|
dev->priv = priv;
|
|
|
|
return dev;
|
|
}
|
|
|
|
VduseDev *vduse_dev_create_by_name(const char *name, uint16_t num_queues,
|
|
const VduseOps *ops, void *priv)
|
|
{
|
|
VduseDev *dev;
|
|
int ret;
|
|
|
|
if (!name || vduse_name_is_invalid(name) || !ops ||
|
|
!ops->enable_queue || !ops->disable_queue) {
|
|
fprintf(stderr, "Invalid parameter for vduse\n");
|
|
return NULL;
|
|
}
|
|
|
|
dev = calloc(sizeof(VduseDev), 1);
|
|
if (!dev) {
|
|
fprintf(stderr, "Failed to allocate vduse device\n");
|
|
return NULL;
|
|
}
|
|
|
|
ret = vduse_dev_init(dev, name, num_queues, ops, priv);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Failed to init vduse device %s: %s\n",
|
|
name, strerror(-ret));
|
|
free(dev);
|
|
return NULL;
|
|
}
|
|
|
|
return dev;
|
|
}
|
|
|
|
VduseDev *vduse_dev_create(const char *name, uint32_t device_id,
|
|
uint32_t vendor_id, uint64_t features,
|
|
uint16_t num_queues, uint32_t config_size,
|
|
char *config, const VduseOps *ops, void *priv)
|
|
{
|
|
VduseDev *dev;
|
|
int ret, ctrl_fd;
|
|
uint64_t version;
|
|
struct vduse_dev_config *dev_config;
|
|
size_t size = offsetof(struct vduse_dev_config, config);
|
|
|
|
if (!name || vduse_name_is_invalid(name) ||
|
|
!has_feature(features, VIRTIO_F_VERSION_1) || !config ||
|
|
!config_size || !ops || !ops->enable_queue || !ops->disable_queue) {
|
|
fprintf(stderr, "Invalid parameter for vduse\n");
|
|
return NULL;
|
|
}
|
|
|
|
dev = calloc(sizeof(VduseDev), 1);
|
|
if (!dev) {
|
|
fprintf(stderr, "Failed to allocate vduse device\n");
|
|
return NULL;
|
|
}
|
|
|
|
ctrl_fd = open("/dev/vduse/control", O_RDWR);
|
|
if (ctrl_fd < 0) {
|
|
fprintf(stderr, "Failed to open /dev/vduse/control: %s\n",
|
|
strerror(errno));
|
|
goto err_ctrl;
|
|
}
|
|
|
|
version = VDUSE_API_VERSION;
|
|
if (ioctl(ctrl_fd, VDUSE_SET_API_VERSION, &version)) {
|
|
fprintf(stderr, "Failed to set api version %" PRIu64 ": %s\n",
|
|
version, strerror(errno));
|
|
goto err_dev;
|
|
}
|
|
|
|
dev_config = calloc(size + config_size, 1);
|
|
if (!dev_config) {
|
|
fprintf(stderr, "Failed to allocate config space\n");
|
|
goto err_dev;
|
|
}
|
|
|
|
strncpy(dev_config->name, name, VDUSE_NAME_MAX);
|
|
dev_config->name[VDUSE_NAME_MAX - 1] = '\0';
|
|
dev_config->device_id = device_id;
|
|
dev_config->vendor_id = vendor_id;
|
|
dev_config->features = features;
|
|
dev_config->vq_num = num_queues;
|
|
dev_config->vq_align = VDUSE_VQ_ALIGN;
|
|
dev_config->config_size = config_size;
|
|
memcpy(dev_config->config, config, config_size);
|
|
|
|
ret = ioctl(ctrl_fd, VDUSE_CREATE_DEV, dev_config);
|
|
free(dev_config);
|
|
if (ret && errno != EEXIST) {
|
|
fprintf(stderr, "Failed to create vduse device %s: %s\n",
|
|
name, strerror(errno));
|
|
goto err_dev;
|
|
}
|
|
dev->ctrl_fd = ctrl_fd;
|
|
|
|
ret = vduse_dev_init(dev, name, num_queues, ops, priv);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "Failed to init vduse device %s: %s\n",
|
|
name, strerror(-ret));
|
|
goto err;
|
|
}
|
|
|
|
return dev;
|
|
err:
|
|
ioctl(ctrl_fd, VDUSE_DESTROY_DEV, name);
|
|
err_dev:
|
|
close(ctrl_fd);
|
|
err_ctrl:
|
|
free(dev);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int vduse_dev_destroy(VduseDev *dev)
|
|
{
|
|
size_t log_size = dev->num_queues * vduse_vq_log_size(VIRTQUEUE_MAX_SIZE);
|
|
int i, ret = 0;
|
|
|
|
if (dev->log) {
|
|
munmap(dev->log, log_size);
|
|
}
|
|
for (i = 0; i < dev->num_queues; i++) {
|
|
free(dev->vqs[i].resubmit_list);
|
|
}
|
|
free(dev->vqs);
|
|
if (dev->fd >= 0) {
|
|
close(dev->fd);
|
|
dev->fd = -1;
|
|
}
|
|
if (dev->ctrl_fd >= 0) {
|
|
if (ioctl(dev->ctrl_fd, VDUSE_DESTROY_DEV, dev->name)) {
|
|
ret = -errno;
|
|
}
|
|
close(dev->ctrl_fd);
|
|
dev->ctrl_fd = -1;
|
|
}
|
|
free(dev->name);
|
|
free(dev);
|
|
|
|
return ret;
|
|
}
|