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vhost_client.c
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vhost_client.c
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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* Copyright (c) Cloudbyte Corporation.
* 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 Cloudbyte 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 <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <limits.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/unistd.h>
#include "shm.h"
#include "vring.h"
#include "vhost_user.h"
#include "vhost_client.h"
#define INSTANCE_CREATED 1
#define INSTANCE_INITIALIZED 2
#define INSTANCE_END 3
// the only features that we support
#define VHOST_FEATURES ((1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
(1ULL << VIRTIO_F_VERSION_1) | \
(1ULL << VIRTIO_F_NOTIFY_ON_EMPTY))
/*
* Allocates client structure.
*/
vhost_client_t *
new_vhost_client(const char *path)
{
vhost_client_t *client;
assert(path != NULL);
client = calloc(1, sizeof (vhost_client_t));
if (client == NULL)
return (NULL);
strncpy(client->sock_path, path, PATH_MAX);
client->status = INSTANCE_CREATED;
return (client);
}
/*
* Dummy negotiation as we don't really support any advanced features.
*/
static int
negotiate_features(vhost_client_t *client)
{
uint64_t features;
if (vhost_ioctl(client->sock, VHOST_USER_GET_FEATURES, &features) != 0) {
fprintf(stderr, "Unable to get vhost features\n");
return (-1);
}
client->features &= features;
if (vhost_ioctl(client->sock, VHOST_USER_SET_FEATURES, &client->features) != 0) {
fprintf(stderr, "Unable to set vhost features\n");
return (-1);
}
return (0);
}
/*
* Connects to vhost server and sets basic parameters.
*/
int
init_vhost_client(vhost_client_t *client)
{
struct sockaddr_un un;
size_t len;
VhostUserMemory memory;
if (client->status != INSTANCE_CREATED)
return (-1);
if ((client->sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket");
return (-1);
}
un.sun_family = AF_UNIX;
strcpy(un.sun_path, client->sock_path);
len = sizeof(un.sun_family) strlen(client->sock_path);
if (connect(client->sock, (struct sockaddr *) &un, len) == -1) {
(void) close(client->sock);
perror("connect");
return (-1);
}
if (vhost_ioctl(client->sock, VHOST_USER_SET_OWNER, 0) != 0) {
(void) close(client->sock);
return (-1);
}
if (negotiate_features(client) != 0) {
(void) close(client->sock);
return (-1);
}
/* get mem regions info for passing it to the server */
get_memory_info(&memory);
if (vhost_ioctl(client->sock, VHOST_USER_SET_MEM_TABLE, &memory) != 0) {
(void) close(client->sock);
return (-1);
}
client->status = INSTANCE_INITIALIZED;
return (0);
}
/*
* Establishes shared ring buffer (vring) for doing IOs between client and
* server.
*/
int
set_vhost_vring(vhost_client_t *client, vring_t *vring, unsigned int idx)
{
struct vhost_vring *vring_shm = vring->vring_shm;
struct vhost_vring_state num = { .index = idx, .num = vring->num };
struct vhost_vring_state base = { .index = idx, .num = 0 };
struct vhost_vring_file kick = { .index = idx, .fd = vring->kickfd };
struct vhost_vring_file call = { .index = idx, .fd = vring->callfd };
struct vhost_vring_addr addr = {
.index = idx,
.desc_user_addr = (uintptr_t) &vring_shm->desc,
.avail_user_addr = (uintptr_t) &vring_shm->avail,
.used_user_addr = (uintptr_t) &vring_shm->used,
.log_guest_addr = (uintptr_t) NULL,
.flags = 0
};
if (vhost_ioctl(client->sock, VHOST_USER_SET_VRING_NUM, &num) != 0 ||
vhost_ioctl(client->sock, VHOST_USER_SET_VRING_BASE, &base) != 0 ||
vhost_ioctl(client->sock, VHOST_USER_SET_VRING_KICK, &kick) != 0 ||
vhost_ioctl(client->sock, VHOST_USER_SET_VRING_CALL, &call) != 0 ||
vhost_ioctl(client->sock, VHOST_USER_SET_VRING_ADDR, &addr) != 0) {
return (-1);
}
return (0);
}
/*
* Terminate vhost connection.
*/
void
end_vhost_client(vhost_client_t *client)
{
if (client->status != INSTANCE_INITIALIZED)
return;
vhost_ioctl(client->sock, VHOST_USER_RESET_OWNER, 0);
close(client->sock);
client->status = INSTANCE_END;
free(client);
}