DPDK  19.11.14-rc1
examples/vhost_blk/vhost_blk.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2019 Intel Corporation
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <pthread.h>
#include <sched.h>
#include <stdint.h>
#include <unistd.h>
#include <stdbool.h>
#include <signal.h>
#include <assert.h>
#include <semaphore.h>
#include <linux/virtio_blk.h>
#include <linux/virtio_ring.h>
#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_vhost.h>
#include "vhost_blk.h"
#include "blk_spec.h"
#define VIRTQ_DESC_F_NEXT 1
#define VIRTQ_DESC_F_AVAIL (1 << 7)
#define VIRTQ_DESC_F_USED (1 << 15)
#define MAX_TASK 12
#define VHOST_BLK_FEATURES ((1ULL << VIRTIO_F_RING_PACKED) | \
(1ULL << VIRTIO_F_VERSION_1) |\
(1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
(1ULL << VHOST_USER_F_PROTOCOL_FEATURES))
struct vhost_blk_ctrlr *g_vhost_ctrlr;
/* Path to folder where character device will be created. Can be set by user. */
static char dev_pathname[PATH_MAX] = "";
static sem_t exit_sem;
static int g_should_stop = -1;
struct vhost_blk_ctrlr *
vhost_blk_ctrlr_find(const char *ctrlr_name)
{
if (ctrlr_name == NULL)
return NULL;
/* currently we only support 1 socket file fd */
return g_vhost_ctrlr;
}
static uint64_t gpa_to_vva(int vid, uint64_t gpa, uint64_t *len)
{
char path[PATH_MAX];
struct vhost_blk_ctrlr *ctrlr;
int ret = 0;
ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
if (ret) {
fprintf(stderr, "Cannot get socket name\n");
assert(ret != 0);
}
ctrlr = vhost_blk_ctrlr_find(path);
if (!ctrlr) {
fprintf(stderr, "Controller is not ready\n");
assert(ctrlr != NULL);
}
assert(ctrlr->mem != NULL);
return rte_vhost_va_from_guest_pa(ctrlr->mem, gpa, len);
}
static struct vring_packed_desc *
descriptor_get_next_packed(struct rte_vhost_vring *vq,
uint16_t *idx)
{
if (vq->desc_packed[*idx % vq->size].flags & VIRTQ_DESC_F_NEXT) {
*idx += 1;
return &vq->desc_packed[*idx % vq->size];
}
return NULL;
}
static bool
descriptor_has_next_packed(struct vring_packed_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_NEXT);
}
static bool
descriptor_is_wr_packed(struct vring_packed_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_WRITE);
}
static struct rte_vhost_inflight_desc_packed *
inflight_desc_get_next(struct rte_vhost_inflight_info_packed *inflight_packed,
struct rte_vhost_inflight_desc_packed *cur_desc)
{
if (!!(cur_desc->flags & VIRTQ_DESC_F_NEXT))
return &inflight_packed->desc[cur_desc->next];
return NULL;
}
static bool
inflight_desc_has_next(struct rte_vhost_inflight_desc_packed *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_NEXT);
}
static bool
inflight_desc_is_wr(struct rte_vhost_inflight_desc_packed *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_WRITE);
}
static void
inflight_process_payload_chain_packed(struct inflight_blk_task *task)
{
void *data;
uint64_t chunck_len;
struct vhost_blk_task *blk_task;
struct rte_vhost_inflight_desc_packed *desc;
blk_task = &task->blk_task;
blk_task->iovs_cnt = 0;
do {
desc = task->inflight_desc;
chunck_len = desc->len;
data = (void *)(uintptr_t)gpa_to_vva(blk_task->bdev->vid,
desc->addr,
&chunck_len);
if (!data || chunck_len != desc->len) {
fprintf(stderr, "failed to translate desc address.\n");
return;
}
blk_task->iovs[blk_task->iovs_cnt].iov_base = data;
blk_task->iovs[blk_task->iovs_cnt].iov_len = desc->len;
blk_task->data_len += desc->len;
blk_task->iovs_cnt++;
task->inflight_desc = inflight_desc_get_next(
task->inflight_packed, desc);
} while (inflight_desc_has_next(task->inflight_desc));
chunck_len = task->inflight_desc->len;
blk_task->status = (void *)(uintptr_t)gpa_to_vva(
blk_task->bdev->vid, task->inflight_desc->addr, &chunck_len);
if (!blk_task->status || chunck_len != task->inflight_desc->len)
fprintf(stderr, "failed to translate desc address.\n");
}
static void
inflight_submit_completion_packed(struct inflight_blk_task *task,
uint32_t q_idx, uint16_t *used_id,
bool *used_wrap_counter)
{
struct vhost_blk_ctrlr *ctrlr;
struct rte_vhost_vring *vq;
struct vring_packed_desc *desc;
int ret;
ctrlr = vhost_blk_ctrlr_find(dev_pathname);
vq = task->blk_task.vq;
ret = rte_vhost_set_last_inflight_io_packed(ctrlr->bdev->vid, q_idx,
task->blk_task.head_idx);
if (ret != 0)
fprintf(stderr, "failed to set last inflight io\n");
desc = &vq->desc_packed[*used_id];
desc->id = task->blk_task.buffer_id;
if (*used_wrap_counter)
desc->flags |= VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED;
else
desc->flags &= ~(VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
*used_id += task->blk_task.iovs_cnt + 2;
if (*used_id >= vq->size) {
*used_id -= vq->size;
*used_wrap_counter = !(*used_wrap_counter);
}
ret = rte_vhost_clr_inflight_desc_packed(ctrlr->bdev->vid, q_idx,
task->blk_task.head_idx);
if (ret != 0)
fprintf(stderr, "failed to clear inflight io\n");
/* Send an interrupt back to the guest VM so that it knows
* a completion is ready to be processed.
*/
rte_vhost_vring_call(task->blk_task.bdev->vid, q_idx);
}
static void
submit_completion_packed(struct vhost_blk_task *task, uint32_t q_idx,
uint16_t *used_id, bool *used_wrap_counter)
{
struct vhost_blk_ctrlr *ctrlr;
struct rte_vhost_vring *vq;
struct vring_packed_desc *desc;
int ret;
ctrlr = vhost_blk_ctrlr_find(dev_pathname);
vq = task->vq;
ret = rte_vhost_set_last_inflight_io_packed(ctrlr->bdev->vid, q_idx,
task->inflight_idx);
if (ret != 0)
fprintf(stderr, "failed to set last inflight io\n");
desc = &vq->desc_packed[*used_id];
desc->id = task->buffer_id;
if (*used_wrap_counter)
desc->flags |= VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED;
else
desc->flags &= ~(VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
*used_id += task->iovs_cnt + 2;
if (*used_id >= vq->size) {
*used_id -= vq->size;
*used_wrap_counter = !(*used_wrap_counter);
}
ret = rte_vhost_clr_inflight_desc_packed(ctrlr->bdev->vid, q_idx,
task->inflight_idx);
if (ret != 0)
fprintf(stderr, "failed to clear inflight io\n");
/* Send an interrupt back to the guest VM so that it knows
* a completion is ready to be processed.
*/
rte_vhost_vring_call(task->bdev->vid, q_idx);
}
static void
vhost_process_payload_chain_packed(struct vhost_blk_task *task,
uint16_t *idx)
{
void *data;
uint64_t chunck_len;
task->iovs_cnt = 0;
do {
chunck_len = task->desc_packed->len;
data = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_packed->addr,
&chunck_len);
if (!data || chunck_len != task->desc_packed->len) {
fprintf(stderr, "failed to translate desc address.\n");
return;
}
task->iovs[task->iovs_cnt].iov_base = data;
task->iovs[task->iovs_cnt].iov_len = task->desc_packed->len;
task->data_len += task->desc_packed->len;
task->iovs_cnt++;
task->desc_packed = descriptor_get_next_packed(task->vq, idx);
} while (descriptor_has_next_packed(task->desc_packed));
task->last_idx = *idx % task->vq->size;
chunck_len = task->desc_packed->len;
task->status = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_packed->addr,
&chunck_len);
if (!task->status || chunck_len != task->desc_packed->len)
fprintf(stderr, "failed to translate desc address.\n");
}
static int
descriptor_is_available(struct rte_vhost_vring *vring, uint16_t idx,
bool avail_wrap_counter)
{
uint16_t flags = vring->desc_packed[idx].flags;
return ((!!(flags & VIRTQ_DESC_F_AVAIL) == avail_wrap_counter) &&
(!!(flags & VIRTQ_DESC_F_USED) != avail_wrap_counter));
}
static void
process_requestq_packed(struct vhost_blk_ctrlr *ctrlr, uint32_t q_idx)
{
bool avail_wrap_counter, used_wrap_counter;
uint16_t avail_idx, used_idx;
int ret;
uint64_t chunck_len;
struct vhost_blk_queue *blk_vq;
struct rte_vhost_vring *vq;
struct vhost_blk_task *task;
blk_vq = &ctrlr->bdev->queues[q_idx];
vq = &blk_vq->vq;
avail_idx = blk_vq->last_avail_idx;
avail_wrap_counter = blk_vq->avail_wrap_counter;
used_idx = blk_vq->last_used_idx;
used_wrap_counter = blk_vq->used_wrap_counter;
task = rte_zmalloc(NULL, sizeof(*task), 0);
assert(task != NULL);
task->vq = vq;
task->bdev = ctrlr->bdev;
while (descriptor_is_available(vq, avail_idx, avail_wrap_counter)) {
task->head_idx = avail_idx;
task->desc_packed = &task->vq->desc_packed[task->head_idx];
task->iovs_cnt = 0;
task->data_len = 0;
task->req = NULL;
task->status = NULL;
/* does not support indirect descriptors */
assert((task->desc_packed->flags & VRING_DESC_F_INDIRECT) == 0);
chunck_len = task->desc_packed->len;
task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_packed->addr, &chunck_len);
if (!task->req || chunck_len != task->desc_packed->len) {
fprintf(stderr, "failed to translate desc address.\n");
rte_free(task);
return;
}
task->desc_packed = descriptor_get_next_packed(task->vq,
&avail_idx);
assert(task->desc_packed != NULL);
if (!descriptor_has_next_packed(task->desc_packed)) {
task->dxfer_dir = BLK_DIR_NONE;
task->last_idx = avail_idx % vq->size;
chunck_len = task->desc_packed->len;
task->status = (void *)(uintptr_t)
gpa_to_vva(task->bdev->vid,
task->desc_packed->addr,
&chunck_len);
if (!task->status ||
chunck_len != task->desc_packed->len) {
fprintf(stderr,
"failed to translate desc address.\n");
rte_free(task);
return;
}
} else {
task->readtype = descriptor_is_wr_packed(
task->desc_packed);
vhost_process_payload_chain_packed(task, &avail_idx);
}
task->buffer_id = vq->desc_packed[task->last_idx].id;
rte_vhost_set_inflight_desc_packed(ctrlr->bdev->vid, q_idx,
task->head_idx,
task->last_idx,
&task->inflight_idx);
if (++avail_idx >= vq->size) {
avail_idx -= vq->size;
avail_wrap_counter = !avail_wrap_counter;
}
blk_vq->last_avail_idx = avail_idx;
blk_vq->avail_wrap_counter = avail_wrap_counter;
ret = vhost_bdev_process_blk_commands(ctrlr->bdev, task);
if (ret) {
/* invalid response */
*task->status = VIRTIO_BLK_S_IOERR;
} else {
/* successfully */
*task->status = VIRTIO_BLK_S_OK;
}
submit_completion_packed(task, q_idx, &used_idx,
&used_wrap_counter);
blk_vq->last_used_idx = used_idx;
blk_vq->used_wrap_counter = used_wrap_counter;
}
rte_free(task);
}
static void
submit_inflight_vq_packed(struct vhost_blk_ctrlr *ctrlr,
uint16_t q_idx)
{
bool used_wrap_counter;
int req_idx, ret;
uint16_t used_idx;
uint64_t chunck_len;
struct vhost_blk_queue *blk_vq;
struct rte_vhost_ring_inflight *inflight_vq;
struct rte_vhost_resubmit_info *resubmit_info;
struct rte_vhost_vring *vq;
struct inflight_blk_task *task;
struct vhost_blk_task *blk_task;
struct rte_vhost_inflight_info_packed *inflight_info;
blk_vq = &ctrlr->bdev->queues[q_idx];
vq = &blk_vq->vq;
inflight_vq = &blk_vq->inflight_vq;
resubmit_info = inflight_vq->resubmit_inflight;
inflight_info = inflight_vq->inflight_packed;
used_idx = blk_vq->last_used_idx;
used_wrap_counter = blk_vq->used_wrap_counter;
task = rte_malloc(NULL, sizeof(*task), 0);
if (!task) {
fprintf(stderr, "failed to allocate memory\n");
return;
}
blk_task = &task->blk_task;
blk_task->vq = vq;
blk_task->bdev = ctrlr->bdev;
task->inflight_packed = inflight_vq->inflight_packed;
while (resubmit_info->resubmit_num-- > 0) {
req_idx = resubmit_info->resubmit_num;
blk_task->head_idx =
resubmit_info->resubmit_list[req_idx].index;
task->inflight_desc =
&inflight_info->desc[blk_task->head_idx];
task->blk_task.iovs_cnt = 0;
task->blk_task.data_len = 0;
task->blk_task.req = NULL;
task->blk_task.status = NULL;
/* update the avail idx too
* as it's initial value equals to used idx
*/
blk_vq->last_avail_idx += task->inflight_desc->num;
if (blk_vq->last_avail_idx >= vq->size) {
blk_vq->last_avail_idx -= vq->size;
blk_vq->avail_wrap_counter =
!blk_vq->avail_wrap_counter;
}
/* does not support indirect descriptors */
assert(task->inflight_desc != NULL);
assert((task->inflight_desc->flags &
VRING_DESC_F_INDIRECT) == 0);
chunck_len = task->inflight_desc->len;
blk_task->req = (void *)(uintptr_t)
gpa_to_vva(blk_task->bdev->vid,
task->inflight_desc->addr,
&chunck_len);
if (!blk_task->req ||
chunck_len != task->inflight_desc->len) {
fprintf(stderr, "failed to translate desc address.\n");
rte_free(task);
return;
}
task->inflight_desc = inflight_desc_get_next(
task->inflight_packed, task->inflight_desc);
assert(task->inflight_desc != NULL);
if (!inflight_desc_has_next(task->inflight_desc)) {
blk_task->dxfer_dir = BLK_DIR_NONE;
chunck_len = task->inflight_desc->len;
blk_task->status = (void *)(uintptr_t)
gpa_to_vva(blk_task->bdev->vid,
task->inflight_desc->addr,
&chunck_len);
if (!blk_task->status ||
chunck_len != task->inflight_desc->len) {
fprintf(stderr,
"failed to translate desc address.\n");
rte_free(task);
return;
}
} else {
blk_task->readtype =
inflight_desc_is_wr(task->inflight_desc);
inflight_process_payload_chain_packed(task);
}
blk_task->buffer_id = task->inflight_desc->id;
ret = vhost_bdev_process_blk_commands(ctrlr->bdev, blk_task);
if (ret)
/* invalid response */
*blk_task->status = VIRTIO_BLK_S_IOERR;
else
/* successfully */
*blk_task->status = VIRTIO_BLK_S_OK;
inflight_submit_completion_packed(task, q_idx, &used_idx,
&used_wrap_counter);
blk_vq->last_used_idx = used_idx;
blk_vq->used_wrap_counter = used_wrap_counter;
}
rte_free(task);
}
static struct vring_desc *
descriptor_get_next_split(struct vring_desc *vq_desc,
struct vring_desc *cur_desc)
{
return &vq_desc[cur_desc->next];
}
static bool
descriptor_has_next_split(struct vring_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_NEXT);
}
static bool
descriptor_is_wr_split(struct vring_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_WRITE);
}
static void
vhost_process_payload_chain_split(struct vhost_blk_task *task)
{
void *data;
uint64_t chunck_len;
task->iovs_cnt = 0;
do {
chunck_len = task->desc_split->len;
data = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_split->addr,
&chunck_len);
if (!data || chunck_len != task->desc_split->len) {
fprintf(stderr, "failed to translate desc address.\n");
return;
}
task->iovs[task->iovs_cnt].iov_base = data;
task->iovs[task->iovs_cnt].iov_len = task->desc_split->len;
task->data_len += task->desc_split->len;
task->iovs_cnt++;
task->desc_split =
descriptor_get_next_split(task->vq->desc, task->desc_split);
} while (descriptor_has_next_split(task->desc_split));
chunck_len = task->desc_split->len;
task->status = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_split->addr,
&chunck_len);
if (!task->status || chunck_len != task->desc_split->len)
fprintf(stderr, "failed to translate desc address.\n");
}
static void
submit_completion_split(struct vhost_blk_task *task, uint32_t vid,
uint32_t q_idx)
{
struct rte_vhost_vring *vq;
struct vring_used *used;
vq = task->vq;
used = vq->used;
rte_vhost_set_last_inflight_io_split(vid, q_idx, task->req_idx);
/* Fill out the next entry in the "used" ring. id = the
* index of the descriptor that contained the blk request.
* len = the total amount of data transferred for the blk
* request. We must report the correct len, for variable
* length blk CDBs, where we may return less data than
* allocated by the guest VM.
*/
used->ring[used->idx & (vq->size - 1)].id = task->req_idx;
used->ring[used->idx & (vq->size - 1)].len = task->data_len;
used->idx++;
rte_vhost_clr_inflight_desc_split(vid, q_idx, used->idx, task->req_idx);
/* Send an interrupt back to the guest VM so that it knows
* a completion is ready to be processed.
*/
rte_vhost_vring_call(task->bdev->vid, q_idx);
}
static void
submit_inflight_vq_split(struct vhost_blk_ctrlr *ctrlr,
uint32_t q_idx)
{
struct vhost_blk_queue *blk_vq;
struct rte_vhost_ring_inflight *inflight_vq;
struct rte_vhost_resubmit_info *resubmit_inflight;
struct rte_vhost_resubmit_desc *resubmit_list;
struct vhost_blk_task *task;
int req_idx;
uint64_t chunck_len;
int ret;
blk_vq = &ctrlr->bdev->queues[q_idx];
inflight_vq = &blk_vq->inflight_vq;
resubmit_inflight = inflight_vq->resubmit_inflight;
resubmit_list = resubmit_inflight->resubmit_list;
task = rte_zmalloc(NULL, sizeof(*task), 0);
assert(task != NULL);
task->ctrlr = ctrlr;
task->bdev = ctrlr->bdev;
task->vq = &blk_vq->vq;
while (resubmit_inflight->resubmit_num-- > 0) {
req_idx = resubmit_list[resubmit_inflight->resubmit_num].index;
task->req_idx = req_idx;
task->desc_split = &task->vq->desc[task->req_idx];
task->iovs_cnt = 0;
task->data_len = 0;
task->req = NULL;
task->status = NULL;
/* does not support indirect descriptors */
assert(task->desc_split != NULL);
assert((task->desc_split->flags & VRING_DESC_F_INDIRECT) == 0);
chunck_len = task->desc_split->len;
task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_split->addr, &chunck_len);
if (!task->req || chunck_len != task->desc_split->len) {
fprintf(stderr, "failed to translate desc address.\n");
rte_free(task);
return;
}
task->desc_split = descriptor_get_next_split(task->vq->desc,
task->desc_split);
if (!descriptor_has_next_split(task->desc_split)) {
task->dxfer_dir = BLK_DIR_NONE;
chunck_len = task->desc_split->len;
task->status = (void *)(uintptr_t)
gpa_to_vva(task->bdev->vid,
task->desc_split->addr,
&chunck_len);
if (!task->status ||
chunck_len != task->desc_split->len) {
fprintf(stderr,
"failed to translate desc address.\n");
rte_free(task);
return;
}
} else {
task->readtype =
descriptor_is_wr_split(task->desc_split);
vhost_process_payload_chain_split(task);
}
ret = vhost_bdev_process_blk_commands(ctrlr->bdev, task);
if (ret) {
/* invalid response */
*task->status = VIRTIO_BLK_S_IOERR;
} else {
/* successfully */
*task->status = VIRTIO_BLK_S_OK;
}
submit_completion_split(task, ctrlr->bdev->vid, q_idx);
}
rte_free(task);
}
static void
process_requestq_split(struct vhost_blk_ctrlr *ctrlr, uint32_t q_idx)
{
int ret;
int req_idx;
uint16_t last_idx;
uint64_t chunck_len;
struct vhost_blk_queue *blk_vq;
struct rte_vhost_vring *vq;
struct vhost_blk_task *task;
blk_vq = &ctrlr->bdev->queues[q_idx];
vq = &blk_vq->vq;
task = rte_zmalloc(NULL, sizeof(*task), 0);
assert(task != NULL);
task->ctrlr = ctrlr;
task->bdev = ctrlr->bdev;
task->vq = vq;
while (vq->avail->idx != blk_vq->last_avail_idx) {
last_idx = blk_vq->last_avail_idx & (vq->size - 1);
req_idx = vq->avail->ring[last_idx];
task->req_idx = req_idx;
task->desc_split = &task->vq->desc[task->req_idx];
task->iovs_cnt = 0;
task->data_len = 0;
task->req = NULL;
task->status = NULL;
rte_vhost_set_inflight_desc_split(ctrlr->bdev->vid, q_idx,
task->req_idx);
/* does not support indirect descriptors */
assert((task->desc_split->flags & VRING_DESC_F_INDIRECT) == 0);
chunck_len = task->desc_split->len;
task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
task->desc_split->addr, &chunck_len);
if (!task->req || chunck_len != task->desc_split->len) {
fprintf(stderr, "failed to translate desc address.\n");
rte_free(task);
return;
}
task->desc_split = descriptor_get_next_split(task->vq->desc,
task->desc_split);
if (!descriptor_has_next_split(task->desc_split)) {
task->dxfer_dir = BLK_DIR_NONE;
chunck_len = task->desc_split->len;
task->status = (void *)(uintptr_t)
gpa_to_vva(task->bdev->vid,
task->desc_split->addr,
&chunck_len);
if (!task->status ||
chunck_len != task->desc_split->len) {
fprintf(stderr,
"failed to translate desc address.\n");
rte_free(task);
return;
}
} else {
task->readtype =
descriptor_is_wr_split(task->desc_split);
vhost_process_payload_chain_split(task);
}
blk_vq->last_avail_idx++;
ret = vhost_bdev_process_blk_commands(ctrlr->bdev, task);
if (ret) {
/* invalid response */
*task->status = VIRTIO_BLK_S_IOERR;
} else {
/* successfully */
*task->status = VIRTIO_BLK_S_OK;
}
submit_completion_split(task, ctrlr->bdev->vid, q_idx);
}
rte_free(task);
}
static void *
ctrlr_worker(void *arg)
{
struct vhost_blk_ctrlr *ctrlr = (struct vhost_blk_ctrlr *)arg;
struct vhost_blk_queue *blk_vq;
struct rte_vhost_ring_inflight *inflight_vq;
cpu_set_t cpuset;
pthread_t thread;
int i;
fprintf(stdout, "Ctrlr Worker Thread start\n");
if (ctrlr == NULL || ctrlr->bdev == NULL) {
fprintf(stderr,
"%s: Error, invalid argument passed to worker thread\n",
__func__);
exit(0);
}
thread = pthread_self();
CPU_ZERO(&cpuset);
CPU_SET(0, &cpuset);
pthread_setaffinity_np(thread, sizeof(cpu_set_t), &cpuset);
for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
blk_vq = &ctrlr->bdev->queues[i];
inflight_vq = &blk_vq->inflight_vq;
if (inflight_vq->resubmit_inflight != NULL &&
inflight_vq->resubmit_inflight->resubmit_num != 0) {
if (ctrlr->packed_ring)
submit_inflight_vq_packed(ctrlr, i);
else
submit_inflight_vq_split(ctrlr, i);
}
}
while (!g_should_stop && ctrlr->bdev != NULL) {
for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
if (ctrlr->packed_ring)
process_requestq_packed(ctrlr, i);
else
process_requestq_split(ctrlr, i);
}
}
g_should_stop = 2;
fprintf(stdout, "Ctrlr Worker Thread Exiting\n");
sem_post(&exit_sem);
return NULL;
}
static int
new_device(int vid)
{
struct vhost_blk_ctrlr *ctrlr;
struct vhost_blk_queue *blk_vq;
struct rte_vhost_vring *vq;
uint64_t features;
pthread_t tid;
int i, ret;
ctrlr = vhost_blk_ctrlr_find(dev_pathname);
if (!ctrlr) {
fprintf(stderr, "Controller is not ready\n");
return -1;
}
if (ctrlr->started)
return 0;
ctrlr->bdev->vid = vid;
ret = rte_vhost_get_negotiated_features(vid, &features);
if (ret) {
fprintf(stderr, "failed to get the negotiated features\n");
return -1;
}
ctrlr->packed_ring = !!(features & (1ULL << VIRTIO_F_RING_PACKED));
ret = rte_vhost_get_mem_table(vid, &ctrlr->mem);
if (ret)
fprintf(stderr, "Get Controller memory region failed\n");
assert(ctrlr->mem != NULL);
/* Disable Notifications and init last idx */
for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
blk_vq = &ctrlr->bdev->queues[i];
vq = &blk_vq->vq;
ret = rte_vhost_get_vhost_vring(ctrlr->bdev->vid, i, vq);
assert(ret == 0);
ret = rte_vhost_get_vring_base(ctrlr->bdev->vid, i,
&blk_vq->last_avail_idx,
&blk_vq->last_used_idx);
assert(ret == 0);
ret = rte_vhost_get_vhost_ring_inflight(ctrlr->bdev->vid, i,
&blk_vq->inflight_vq);
assert(ret == 0);
if (ctrlr->packed_ring) {
/* for the reconnection */
ctrlr->bdev->vid, i,
&blk_vq->last_avail_idx,
&blk_vq->last_used_idx);
assert(ret == 0);
blk_vq->avail_wrap_counter = blk_vq->last_avail_idx &
(1 << 15);
blk_vq->last_avail_idx = blk_vq->last_avail_idx &
0x7fff;
blk_vq->used_wrap_counter = blk_vq->last_used_idx &
(1 << 15);
blk_vq->last_used_idx = blk_vq->last_used_idx &
0x7fff;
}
rte_vhost_enable_guest_notification(vid, i, 0);
}
/* start polling vring */
g_should_stop = 0;
fprintf(stdout, "New Device %s, Device ID %d\n", dev_pathname, vid);
if (pthread_create(&tid, NULL, &ctrlr_worker, ctrlr) < 0) {
fprintf(stderr, "Worker Thread Started Failed\n");
return -1;
}
/* device has been started */
ctrlr->started = 1;
pthread_detach(tid);
return 0;
}
static void
destroy_device(int vid)
{
char path[PATH_MAX];
struct vhost_blk_ctrlr *ctrlr;
struct vhost_blk_queue *blk_vq;
int i, ret;
ret = rte_vhost_get_ifname(vid, path, PATH_MAX);
if (ret) {
fprintf(stderr, "Destroy Ctrlr Failed\n");
return;
}
fprintf(stdout, "Destroy %s Device ID %d\n", path, vid);
ctrlr = vhost_blk_ctrlr_find(path);
if (!ctrlr) {
fprintf(stderr, "Destroy Ctrlr Failed\n");
return;
}
if (!ctrlr->started)
return;
g_should_stop = 1;
while (g_should_stop != 2)
;
for (i = 0; i < NUM_OF_BLK_QUEUES; i++) {
blk_vq = &ctrlr->bdev->queues[i];
if (ctrlr->packed_ring) {
blk_vq->last_avail_idx |= (blk_vq->avail_wrap_counter <<
15);
blk_vq->last_used_idx |= (blk_vq->used_wrap_counter <<
15);
}
rte_vhost_set_vring_base(ctrlr->bdev->vid, i,
blk_vq->last_avail_idx,
blk_vq->last_used_idx);
}
free(ctrlr->mem);
ctrlr->started = 0;
sem_wait(&exit_sem);
}
static int
new_connection(int vid)
{
/* extend the proper features for block device */
vhost_session_install_rte_compat_hooks(vid);
return 0;
}
struct vhost_device_ops vhost_blk_device_ops = {
.destroy_device = destroy_device,
.new_connection = new_connection,
};
static struct vhost_block_dev *
vhost_blk_bdev_construct(const char *bdev_name,
const char *bdev_serial, uint32_t blk_size, uint64_t blk_cnt,
bool wce_enable)
{
struct vhost_block_dev *bdev;
bdev = rte_zmalloc(NULL, sizeof(*bdev), RTE_CACHE_LINE_SIZE);
if (!bdev)
return NULL;
strncpy(bdev->name, bdev_name, sizeof(bdev->name));
strncpy(bdev->product_name, bdev_serial, sizeof(bdev->product_name));
bdev->blocklen = blk_size;
bdev->blockcnt = blk_cnt;
bdev->write_cache = wce_enable;
fprintf(stdout, "blocklen=%d, blockcnt=%"PRIx64"\n", bdev->blocklen,
bdev->blockcnt);
/* use memory as disk storage space */
bdev->data = rte_zmalloc(NULL, blk_cnt * blk_size, 0);
if (!bdev->data) {
fprintf(stderr, "no enough reserved huge memory for disk\n");
free(bdev);
return NULL;
}
return bdev;
}
static struct vhost_blk_ctrlr *
vhost_blk_ctrlr_construct(const char *ctrlr_name)
{
int ret;
struct vhost_blk_ctrlr *ctrlr;
char *path;
char cwd[PATH_MAX];
/* always use current directory */
path = getcwd(cwd, PATH_MAX);
if (!path) {
fprintf(stderr, "Cannot get current working directory\n");
return NULL;
}
snprintf(dev_pathname, sizeof(dev_pathname), "%s/%s", path, ctrlr_name);
unlink(dev_pathname);
if (rte_vhost_driver_register(dev_pathname, 0) != 0) {
fprintf(stderr, "socket %s already exists\n", dev_pathname);
return NULL;
}
ret = rte_vhost_driver_set_features(dev_pathname, VHOST_BLK_FEATURES);
if (ret != 0) {
fprintf(stderr, "Set vhost driver features failed\n");
rte_vhost_driver_unregister(dev_pathname);
return NULL;
}
/* set proper features */
vhost_dev_install_rte_compat_hooks(dev_pathname);
ctrlr = rte_zmalloc(NULL, sizeof(*ctrlr), RTE_CACHE_LINE_SIZE);
if (!ctrlr) {
rte_vhost_driver_unregister(dev_pathname);
return NULL;
}
/* hardcoded block device information with 128MiB */
ctrlr->bdev = vhost_blk_bdev_construct("malloc0", "vhost_blk_malloc0",
4096, 32768, 0);
if (!ctrlr->bdev) {
rte_free(ctrlr);
rte_vhost_driver_unregister(dev_pathname);
return NULL;
}
rte_vhost_driver_callback_register(dev_pathname,
&vhost_blk_device_ops);
return ctrlr;
}
static void
signal_handler(__rte_unused int signum)
{
struct vhost_blk_ctrlr *ctrlr;
unlink(dev_pathname);
if (g_should_stop != -1) {
g_should_stop = 1;
while (g_should_stop != 2)
;
}
ctrlr = vhost_blk_ctrlr_find(dev_pathname);
if (ctrlr != NULL) {
if (ctrlr->bdev != NULL) {
rte_free(ctrlr->bdev->data);
rte_free(ctrlr->bdev);
}
rte_free(ctrlr);
}
rte_vhost_driver_unregister(dev_pathname);
exit(0);
}
int main(int argc, char *argv[])
{
int ret;
signal(SIGINT, signal_handler);
/* init EAL */
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
g_vhost_ctrlr = vhost_blk_ctrlr_construct("vhost.socket");
if (g_vhost_ctrlr == NULL) {
fprintf(stderr, "Construct vhost blk controller failed\n");
return 0;
}
if (sem_init(&exit_sem, 0, 0) < 0) {
fprintf(stderr, "Error init exit_sem\n");
return -1;
}
ret = rte_vhost_driver_start(dev_pathname);
if (ret < 0) {
fprintf(stderr, "Failed to start vhost driver.\n");
return -1;
}
/* loop for exit the application */
while (1)
sleep(1);
/* clean up the EAL */
return 0;
}