numam-spdk/lib/vhost/vhost.c

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/*-
* BSD LICENSE
*
* Copyright(c) Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "spdk/stdinc.h"
#include "spdk/env.h"
#include "spdk/likely.h"
#include "spdk/string.h"
#include "spdk/util.h"
#include "spdk/barrier.h"
#include "spdk/vhost.h"
#include "vhost_internal.h"
static uint32_t g_num_ctrlrs[RTE_MAX_LCORE];
/* Path to folder where character device will be created. Can be set by user. */
static char dev_dirname[PATH_MAX] = "";
#define MAX_VHOST_DEVICES 64
struct spdk_vhost_dev_event_ctx {
/** Pointer to the controller obtained before enqueuing the event */
struct spdk_vhost_dev *vdev;
/** Name of the ctrlr to send event to */
char *ctrlr_name;
/** User callback function to be executed on given lcore. */
spdk_vhost_event_fn cb_fn;
/** Semaphore used to signal that event is done. */
sem_t sem;
};
static int new_connection(int vid);
static int new_device(int vid);
static void destroy_device(int vid);
static void destroy_connection(int vid);
const struct vhost_device_ops g_spdk_vhost_ops = {
.new_device = new_device,
.destroy_device = destroy_device,
.new_connection = new_connection,
.destroy_connection = destroy_connection,
};
static struct spdk_vhost_dev *g_spdk_vhost_devices[MAX_VHOST_DEVICES];
static pthread_mutex_t g_spdk_vhost_mutex = PTHREAD_MUTEX_INITIALIZER;
void *spdk_vhost_gpa_to_vva(struct spdk_vhost_dev *vdev, uint64_t addr)
{
return (void *)rte_vhost_gpa_to_vva(vdev->mem, addr);
}
/*
* Get available requests from avail ring.
*/
uint16_t
spdk_vhost_vq_avail_ring_get(struct rte_vhost_vring *vq, uint16_t *reqs, uint16_t reqs_len)
{
struct vring_avail *avail = vq->avail;
uint16_t size_mask = vq->size - 1;
uint16_t last_idx = vq->last_avail_idx, avail_idx = avail->idx;
uint16_t count = RTE_MIN((avail_idx - last_idx) & size_mask, reqs_len);
uint16_t i;
if (spdk_likely(count == 0)) {
return 0;
}
vq->last_avail_idx += count;
for (i = 0; i < count; i++) {
reqs[i] = vq->avail->ring[(last_idx + i) & size_mask];
}
SPDK_DEBUGLOG(SPDK_TRACE_VHOST_RING,
"AVAIL: last_idx=%"PRIu16" avail_idx=%"PRIu16" count=%"PRIu16"\n",
last_idx, avail_idx, count);
return count;
}
struct vring_desc *
spdk_vhost_vq_get_desc(struct rte_vhost_vring *vq, uint16_t req_idx)
{
assert(req_idx < vq->size);
return &vq->desc[req_idx];
}
/*
* Enqueue id and len to used ring.
*/
void
spdk_vhost_vq_used_ring_enqueue(struct spdk_vhost_dev *vdev, struct rte_vhost_vring *vq,
uint16_t id,
uint32_t len)
{
int need_event = 0;
struct vring_used *used = vq->used;
uint16_t last_idx = vq->last_used_idx & (vq->size - 1);
SPDK_DEBUGLOG(SPDK_TRACE_VHOST_RING, "USED: last_idx=%"PRIu16" req id=%"PRIu16" len=%"PRIu32"\n",
vq->last_used_idx, id, len);
vq->last_used_idx++;
used->ring[last_idx].id = id;
used->ring[last_idx].len = len;
spdk_wmb();
* (volatile uint16_t *) &used->idx = vq->last_used_idx;
if (spdk_vhost_dev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
spdk_unlikely(vq->avail->idx == vq->last_avail_idx)) {
need_event = 1;
} else {
spdk_mb();
need_event = !(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
}
if (need_event) {
eventfd_write(vq->callfd, (eventfd_t)1);
}
}
bool
spdk_vhost_vring_desc_has_next(struct vring_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_NEXT);
}
struct vring_desc *
spdk_vhost_vring_desc_get_next(struct vring_desc *vq_desc, struct vring_desc *cur_desc)
{
assert(spdk_vhost_vring_desc_has_next(cur_desc));
return &vq_desc[cur_desc->next];
}
bool
spdk_vhost_vring_desc_is_wr(struct vring_desc *cur_desc)
{
return !!(cur_desc->flags & VRING_DESC_F_WRITE);
}
#define _2MB_OFFSET(ptr) ((ptr) & (0x200000 - 1))
int
spdk_vhost_vring_desc_to_iov(struct spdk_vhost_dev *vdev, struct iovec *iov,
uint16_t *iov_index, const struct vring_desc *desc)
{
uint32_t remaining = desc->len;
uint32_t len;
uintptr_t payload = desc->addr;
uintptr_t vva;
while (remaining) {
if (*iov_index >= SPDK_VHOST_IOVS_MAX) {
SPDK_ERRLOG("SPDK_VHOST_IOVS_MAX(%d) reached\n", SPDK_VHOST_IOVS_MAX);
return -1;
}
vva = (uintptr_t)spdk_vhost_gpa_to_vva(vdev, payload);
if (vva == 0) {
SPDK_ERRLOG("gpa_to_vva(%p) == NULL\n", (void *)payload);
return -1;
}
len = spdk_min(remaining, 0x200000 - _2MB_OFFSET(payload));
iov[*iov_index].iov_base = (void *)vva;
iov[*iov_index].iov_len = len;
remaining -= len;
payload += len;
(*iov_index)++;
}
return 0;
}
bool
spdk_vhost_dev_has_feature(struct spdk_vhost_dev *vdev, unsigned feature_id)
{
return vdev->negotiated_features & (1ULL << feature_id);
}
static struct spdk_vhost_dev *
spdk_vhost_dev_find_by_vid(int vid)
{
unsigned i;
struct spdk_vhost_dev *vdev;
for (i = 0; i < MAX_VHOST_DEVICES; i++) {
vdev = g_spdk_vhost_devices[i];
if (vdev && vdev->vid == vid) {
return vdev;
}
}
return NULL;
}
#define SHIFT_2MB 21
#define SIZE_2MB (1ULL << SHIFT_2MB)
#define FLOOR_2MB(x) (((uintptr_t)x) / SIZE_2MB) << SHIFT_2MB
#define CEIL_2MB(x) ((((uintptr_t)x) + SIZE_2MB - 1) / SIZE_2MB) << SHIFT_2MB
void
spdk_vhost_dev_mem_register(struct spdk_vhost_dev *vdev)
{
struct rte_vhost_mem_region *region;
uint32_t i;
for (i = 0; i < vdev->mem->nregions; i++) {
uint64_t start, end, len;
region = &vdev->mem->regions[i];
start = FLOOR_2MB(region->mmap_addr);
end = CEIL_2MB(region->mmap_addr + region->mmap_size);
len = end - start;
SPDK_NOTICELOG("Registering VM memory for vtophys translation - 0x%jx len:0x%jx\n",
start, len);
if (spdk_mem_register((void *)start, len) != 0) {
SPDK_WARNLOG("Failed to register memory region %"PRIu32". Future vtophys translation might fail.\n",
i);
continue;
}
}
}
void
spdk_vhost_dev_mem_unregister(struct spdk_vhost_dev *vdev)
{
struct rte_vhost_mem_region *region;
uint32_t i;
for (i = 0; i < vdev->mem->nregions; i++) {
uint64_t start, end, len;
region = &vdev->mem->regions[i];
start = FLOOR_2MB(region->mmap_addr);
end = CEIL_2MB(region->mmap_addr + region->mmap_size);
len = end - start;
if (spdk_vtophys((void *) start) == SPDK_VTOPHYS_ERROR) {
continue; /* region has not been registered */
}
if (spdk_mem_unregister((void *)start, len) != 0) {
assert(false);
}
}
}
static void
spdk_vhost_free_reactor(uint32_t lcore)
{
g_num_ctrlrs[lcore]--;
}
struct spdk_vhost_dev *
spdk_vhost_dev_find(const char *ctrlr_name)
{
unsigned i;
size_t dev_dirname_len = strlen(dev_dirname);
if (strncmp(ctrlr_name, dev_dirname, dev_dirname_len) == 0) {
ctrlr_name += dev_dirname_len;
}
for (i = 0; i < MAX_VHOST_DEVICES; i++) {
if (g_spdk_vhost_devices[i] == NULL) {
continue;
}
if (strcmp(g_spdk_vhost_devices[i]->name, ctrlr_name) == 0) {
return g_spdk_vhost_devices[i];
}
}
return NULL;
}
static int
spdk_vhost_parse_core_mask(const char *mask, uint64_t *cpumask)
{
char *end;
if (mask == NULL) {
*cpumask = spdk_app_get_core_mask();
return 0;
}
errno = 0;
*cpumask = strtoull(mask, &end, 16);
if (*end != '\0' || errno || !*cpumask ||
((*cpumask & spdk_app_get_core_mask()) != *cpumask)) {
return -1;
}
return 0;
}
int
spdk_vhost_dev_construct(struct spdk_vhost_dev *vdev, const char *name, const char *mask_str,
enum spdk_vhost_dev_type type, const struct spdk_vhost_dev_backend *backend)
{
unsigned ctrlr_num;
char path[PATH_MAX];
struct stat file_stat;
char buf[64];
uint64_t cpumask;
assert(vdev);
if (name == NULL) {
SPDK_ERRLOG("Can't register controller with no name\n");
return -EINVAL;
}
if (spdk_vhost_parse_core_mask(mask_str, &cpumask) != 0) {
SPDK_ERRLOG("cpumask %s not a subset of app mask 0x%jx\n",
mask_str, spdk_app_get_core_mask());
return -EINVAL;
}
if (spdk_vhost_dev_find(name)) {
SPDK_ERRLOG("vhost controller %s already exists.\n", name);
return -EEXIST;
}
for (ctrlr_num = 0; ctrlr_num < MAX_VHOST_DEVICES; ctrlr_num++) {
if (g_spdk_vhost_devices[ctrlr_num] == NULL) {
break;
}
}
if (ctrlr_num == MAX_VHOST_DEVICES) {
SPDK_ERRLOG("Max controllers reached (%d).\n", MAX_VHOST_DEVICES);
return -ENOSPC;
}
if (snprintf(path, sizeof(path), "%s%s", dev_dirname, name) >= (int)sizeof(path)) {
SPDK_ERRLOG("Resulting socket path for controller %s is too long: %s%s\n", name, dev_dirname,
name);
return -EINVAL;
}
/* Register vhost driver to handle vhost messages. */
if (stat(path, &file_stat) != -1) {
if (!S_ISSOCK(file_stat.st_mode)) {
SPDK_ERRLOG("Cannot remove %s: not a socket.\n", path);
return -EIO;
} else if (unlink(path) != 0) {
SPDK_ERRLOG("Cannot remove %s.\n", path);
return -EIO;
}
}
if (rte_vhost_driver_register(path, 0) != 0) {
SPDK_ERRLOG("Could not register controller %s with vhost library\n", name);
SPDK_ERRLOG("Check if domain socket %s already exists\n", path);
return -EIO;
}
if (rte_vhost_driver_set_features(path, backend->virtio_features) ||
rte_vhost_driver_disable_features(path, backend->disabled_features)) {
SPDK_ERRLOG("Couldn't set vhost features for controller %s\n", name);
rte_vhost_driver_unregister(path);
return -EIO;
}
if (rte_vhost_driver_callback_register(path, &g_spdk_vhost_ops) != 0) {
rte_vhost_driver_unregister(path);
SPDK_ERRLOG("Couldn't register callbacks for controller %s\n", name);
return -EIO;
}
vdev->name = strdup(name);
vdev->path = strdup(path);
vdev->vid = -1;
vdev->lcore = -1;
vdev->cpumask = cpumask;
vdev->type = type;
vdev->backend = backend;
g_spdk_vhost_devices[ctrlr_num] = vdev;
if (rte_vhost_driver_start(path) != 0) {
spdk_strerror_r(errno, buf, sizeof(buf));
SPDK_ERRLOG("Failed to start vhost driver for controller %s (%d): %s\n", name, errno,
buf);
rte_vhost_driver_unregister(path);
return -EIO;
}
SPDK_NOTICELOG("Controller %s: new controller added\n", vdev->name);
return 0;
}
int
spdk_vhost_dev_remove(struct spdk_vhost_dev *vdev)
{
unsigned ctrlr_num;
char path[PATH_MAX];
if (vdev->vid != -1) {
SPDK_ERRLOG("Controller %s has still valid connection.\n", vdev->name);
return -ENODEV;
}
for (ctrlr_num = 0; ctrlr_num < MAX_VHOST_DEVICES; ctrlr_num++) {
if (g_spdk_vhost_devices[ctrlr_num] == vdev) {
break;
}
}
if (ctrlr_num == MAX_VHOST_DEVICES) {
SPDK_ERRLOG("Trying to remove invalid controller: %s.\n", vdev->name);
return -ENOSPC;
}
if (snprintf(path, sizeof(path), "%s%s", dev_dirname, vdev->name) >= (int)sizeof(path)) {
SPDK_ERRLOG("Resulting socket path for controller %s is too long: %s%s\n", vdev->name, dev_dirname,
vdev->name);
return -EINVAL;
}
if (rte_vhost_driver_unregister(path) != 0) {
SPDK_ERRLOG("Could not unregister controller %s with vhost library\n"
"Check if domain socket %s still exists\n", vdev->name, path);
return -EIO;
}
SPDK_NOTICELOG("Controller %s: removed\n", vdev->name);
free(vdev->name);
free(vdev->path);
g_spdk_vhost_devices[ctrlr_num] = NULL;
return 0;
}
struct spdk_vhost_dev *
spdk_vhost_dev_next(struct spdk_vhost_dev *prev)
{
int i = 0;
if (prev != NULL) {
for (; i < MAX_VHOST_DEVICES; i++) {
if (g_spdk_vhost_devices[i] == prev) {
break;
}
}
i++;
}
for (; i < MAX_VHOST_DEVICES; i++) {
if (g_spdk_vhost_devices[i] == NULL) {
continue;
}
return g_spdk_vhost_devices[i];
}
return NULL;
}
const char *
spdk_vhost_dev_get_name(struct spdk_vhost_dev *vdev)
{
assert(vdev != NULL);
return vdev->name;
}
uint64_t
spdk_vhost_dev_get_cpumask(struct spdk_vhost_dev *vdev)
{
assert(vdev != NULL);
return vdev->cpumask;
}
static uint32_t
spdk_vhost_allocate_reactor(uint64_t cpumask)
{
uint32_t i, selected_core;
uint32_t min_ctrlrs;
cpumask &= spdk_app_get_core_mask();
if (cpumask == 0) {
return 0;
}
min_ctrlrs = INT_MAX;
selected_core = 0;
for (i = 0; i < RTE_MAX_LCORE && i < 64; i++) {
if (!((1ULL << i) & cpumask)) {
continue;
}
if (g_num_ctrlrs[i] < min_ctrlrs) {
selected_core = i;
min_ctrlrs = g_num_ctrlrs[i];
}
}
g_num_ctrlrs[selected_core]++;
return selected_core;
}
static void
spdk_vhost_event_cb(void *arg1, void *arg2)
{
struct spdk_vhost_dev_event_ctx *ctx = arg1;
ctx->cb_fn(ctx->vdev, &ctx->sem);
}
static void
spdk_vhost_event_async_fn(void *arg1, void *arg2)
{
struct spdk_vhost_dev_event_ctx *ctx = arg1;
struct spdk_vhost_dev *vdev;
pthread_mutex_lock(&g_spdk_vhost_mutex);
vdev = spdk_vhost_dev_find(ctx->ctrlr_name);
if (vdev != ctx->vdev) {
/* vdev has been changed after enqueuing this event */
vdev = NULL;
}
ctx->cb_fn(vdev, arg2);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
free(ctx->ctrlr_name);
free(ctx);
}
static int
spdk_vhost_event_send(struct spdk_vhost_dev *vdev, spdk_vhost_event_fn cb_fn,
unsigned timeout_sec, const char *errmsg)
{
struct spdk_vhost_dev_event_ctx ev_ctx = {0};
struct spdk_event *ev;
struct timespec timeout;
int rc;
rc = sem_init(&ev_ctx.sem, 0, 0);
if (rc != 0) {
SPDK_ERRLOG("Failed to initialize semaphore for vhost timed event\n");
return -errno;
}
ev_ctx.vdev = vdev;
ev_ctx.ctrlr_name = strdup(vdev->name);
ev_ctx.cb_fn = cb_fn;
ev = spdk_event_allocate(vdev->lcore, spdk_vhost_event_cb, &ev_ctx, NULL);
assert(ev);
spdk_event_call(ev);
clock_gettime(CLOCK_REALTIME, &timeout);
timeout.tv_sec += timeout_sec;
rc = sem_timedwait(&ev_ctx.sem, &timeout);
if (rc != 0) {
SPDK_ERRLOG("Timout waiting for event: %s.\n", errmsg);
abort();
}
sem_destroy(&ev_ctx.sem);
free(ev_ctx.ctrlr_name);
return rc;
}
static int
spdk_vhost_event_async_send(struct spdk_vhost_dev *vdev, spdk_vhost_event_fn cb_fn, void *arg)
{
struct spdk_vhost_dev_event_ctx *ev_ctx;
struct spdk_event *ev;
ev_ctx = calloc(1, sizeof(*ev_ctx));
if (ev_ctx == NULL) {
SPDK_ERRLOG("Failed to alloc vhost event.\n");
return -ENOMEM;
}
ev_ctx->vdev = vdev;
ev_ctx->ctrlr_name = strdup(vdev->name);
ev_ctx->cb_fn = cb_fn;
ev = spdk_event_allocate(vdev->lcore, spdk_vhost_event_async_fn, ev_ctx, arg);
assert(ev);
spdk_event_call(ev);
return 0;
}
static void
destroy_device(int vid)
{
struct spdk_vhost_dev *vdev;
struct rte_vhost_vring *q;
int rc;
uint16_t i;
pthread_mutex_lock(&g_spdk_vhost_mutex);
vdev = spdk_vhost_dev_find_by_vid(vid);
if (vdev == NULL) {
SPDK_ERRLOG("Couldn't find device with vid %d to stop.\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return;
}
if (vdev->lcore == -1) {
SPDK_ERRLOG("Controller %s is not loaded.\n", vdev->name);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return;
}
rc = spdk_vhost_event_send(vdev, vdev->backend->destroy_device, 3, "destroy device");
if (rc != 0) {
SPDK_ERRLOG("Couldn't stop device with vid %d.\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return;
}
for (i = 0; i < vdev->num_queues; i++) {
q = &vdev->virtqueue[i];
rte_vhost_set_vhost_vring_last_idx(vdev->vid, i, q->last_avail_idx, q->last_used_idx);
}
free(vdev->mem);
spdk_vhost_free_reactor(vdev->lcore);
vdev->lcore = -1;
pthread_mutex_unlock(&g_spdk_vhost_mutex);
}
static int
new_device(int vid)
{
struct spdk_vhost_dev *vdev;
int rc = -1;
uint16_t num_queues;
uint16_t i;
pthread_mutex_lock(&g_spdk_vhost_mutex);
num_queues = rte_vhost_get_vring_num(vid);
vdev = spdk_vhost_dev_find_by_vid(vid);
if (vdev == NULL) {
SPDK_ERRLOG("Controller with vid %d doesn't exist.\n", vid);
goto out;
}
if (vdev->lcore != -1) {
SPDK_ERRLOG("Controller %s already loaded.\n", vdev->name);
goto out;
}
if (num_queues > SPDK_VHOST_MAX_VQUEUES) {
SPDK_ERRLOG("vhost device %d: Too many queues (%"PRIu16"). Max %"PRIu16"\n", vid, num_queues,
SPDK_VHOST_MAX_VQUEUES);
goto out;
}
for (i = 0; i < num_queues; i++) {
if (rte_vhost_get_vhost_vring(vid, i, &vdev->virtqueue[i])) {
SPDK_ERRLOG("vhost device %d: Failed to get information of queue %"PRIu16"\n", vid, i);
goto out;
}
/* Disable notifications. */
if (rte_vhost_enable_guest_notification(vid, i, 0) != 0) {
SPDK_ERRLOG("vhost device %d: Failed to disable guest notification on queue %"PRIu16"\n", vid, i);
goto out;
}
}
vdev->num_queues = num_queues;
if (rte_vhost_get_negotiated_features(vid, &vdev->negotiated_features) != 0) {
SPDK_ERRLOG("vhost device %d: Failed to get negotiated driver features\n", vid);
goto out;
}
if (rte_vhost_get_mem_table(vid, &vdev->mem) != 0) {
SPDK_ERRLOG("vhost device %d: Failed to get guest memory table\n", vid);
goto out;
}
vdev->lcore = spdk_vhost_allocate_reactor(vdev->cpumask);
rc = spdk_vhost_event_send(vdev, vdev->backend->new_device, 3, "new device");
if (rc != 0) {
free(vdev->mem);
spdk_vhost_free_reactor(vdev->lcore);
vdev->lcore = -1;
}
out:
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return rc;
}
void
spdk_vhost_startup(void *arg1, void *arg2)
{
int ret;
const char *basename = arg1;
if (basename && strlen(basename) > 0) {
ret = snprintf(dev_dirname, sizeof(dev_dirname) - 2, "%s", basename);
if ((size_t)ret >= sizeof(dev_dirname) - 2) {
SPDK_ERRLOG("Char dev dir path length %d is too long\n", ret);
abort();
}
if (dev_dirname[ret - 1] != '/') {
dev_dirname[ret] = '/';
dev_dirname[ret + 1] = '\0';
}
}
ret = spdk_vhost_scsi_controller_construct();
if (ret != 0) {
SPDK_ERRLOG("Cannot construct vhost controllers\n");
abort();
}
ret = spdk_vhost_blk_controller_construct();
if (ret != 0) {
SPDK_ERRLOG("Cannot construct vhost block controllers\n");
abort();
}
}
static void *
session_shutdown(void *arg)
{
struct spdk_vhost_dev *vdev = NULL;
char path[PATH_MAX];
int i;
for (i = 0; i < MAX_VHOST_DEVICES; i++) {
vdev = g_spdk_vhost_devices[i];
if (vdev == NULL) {
continue;
}
if (snprintf(path, sizeof(path), "%s%s", dev_dirname, vdev->name) >= (int)sizeof(path)) {
SPDK_ERRLOG("Resulting socket path for controller %s is too long: %s%s\n", vdev->name, dev_dirname,
vdev->name);
assert(false);
continue;
}
rte_vhost_driver_unregister(path);
}
SPDK_NOTICELOG("Exiting\n");
spdk_app_stop(0);
return NULL;
}
/*
* When we receive a INT signal. Execute shutdown in separate thread to avoid deadlock.
*/
void
spdk_vhost_shutdown_cb(void)
{
pthread_t tid;
char buf[64];
if (pthread_create(&tid, NULL, &session_shutdown, NULL) < 0) {
spdk_strerror_r(errno, buf, sizeof(buf));
SPDK_ERRLOG("Failed to start session shutdown thread (%d): %s\n", errno, buf);
abort();
}
pthread_detach(tid);
}
void
spdk_vhost_dump_config_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w)
{
assert(vdev->backend->dump_config_json != NULL);
vdev->backend->dump_config_json(vdev, w);
}
static int
new_connection(int vid)
{
struct spdk_vhost_dev *vdev;
char ifname[PATH_MAX];
pthread_mutex_lock(&g_spdk_vhost_mutex);
if (rte_vhost_get_ifname(vid, ifname, PATH_MAX) < 0) {
SPDK_ERRLOG("Couldn't get a valid ifname for device with vid %d\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return -1;
}
vdev = spdk_vhost_dev_find(ifname);
if (vdev == NULL) {
SPDK_ERRLOG("Couldn't find device with vid %d to create connection for.\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return -1;
}
/* since pollers are not running it safe not to use spdk_event here */
if (vdev->vid != -1) {
SPDK_ERRLOG("Device with vid %d is already connected.\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return -1;
}
vdev->vid = vid;
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return 0;
}
static void
destroy_connection(int vid)
{
struct spdk_vhost_dev *vdev;
pthread_mutex_lock(&g_spdk_vhost_mutex);
vdev = spdk_vhost_dev_find_by_vid(vid);
if (vdev == NULL) {
SPDK_ERRLOG("Couldn't find device with vid %d to destroy connection for.\n", vid);
pthread_mutex_unlock(&g_spdk_vhost_mutex);
return;
}
/* since pollers are not running it safe not to use spdk_event here */
vdev->vid = -1;
pthread_mutex_unlock(&g_spdk_vhost_mutex);
}
void
spdk_vhost_call_external_event(const char *ctrlr_name, spdk_vhost_event_fn fn, void *arg)
{
struct spdk_vhost_dev *vdev;
pthread_mutex_lock(&g_spdk_vhost_mutex);
vdev = spdk_vhost_dev_find(ctrlr_name);
if (vdev == NULL) {
pthread_mutex_unlock(&g_spdk_vhost_mutex);
fn(NULL, arg);
return;
}
if (vdev->lcore == -1) {
fn(vdev, arg);
} else {
spdk_vhost_event_async_send(vdev, fn, arg);
}
pthread_mutex_unlock(&g_spdk_vhost_mutex);
}
SPDK_LOG_REGISTER_TRACE_FLAG("vhost_ring", SPDK_TRACE_VHOST_RING)