numam-dpdk/lib/librte_vhost/socket.c
Zhihong Wang 07718b4f87 vhost: adapt library for selective datapath
This patch adapts vhost lib for selective datapath by calling device ops
at the corresponding stage.

Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
2018-04-14 00:40:21 +02:00

1047 lines
24 KiB
C

/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2016 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/queue.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <rte_log.h>
#include "fd_man.h"
#include "vhost.h"
#include "vhost_user.h"
TAILQ_HEAD(vhost_user_connection_list, vhost_user_connection);
/*
* Every time rte_vhost_driver_register() is invoked, an associated
* vhost_user_socket struct will be created.
*/
struct vhost_user_socket {
struct vhost_user_connection_list conn_list;
pthread_mutex_t conn_mutex;
char *path;
int socket_fd;
struct sockaddr_un un;
bool is_server;
bool reconnect;
bool dequeue_zero_copy;
bool iommu_support;
bool use_builtin_virtio_net;
/*
* The "supported_features" indicates the feature bits the
* vhost driver supports. The "features" indicates the feature
* bits after the rte_vhost_driver_features_disable/enable().
* It is also the final feature bits used for vhost-user
* features negotiation.
*/
uint64_t supported_features;
uint64_t features;
/*
* Device id to identify a specific backend device.
* It's set to -1 for the default software implementation.
* If valid, one socket can have 1 connection only.
*/
int vdpa_dev_id;
struct vhost_device_ops const *notify_ops;
};
struct vhost_user_connection {
struct vhost_user_socket *vsocket;
int connfd;
int vid;
TAILQ_ENTRY(vhost_user_connection) next;
};
#define MAX_VHOST_SOCKET 1024
struct vhost_user {
struct vhost_user_socket *vsockets[MAX_VHOST_SOCKET];
struct fdset fdset;
int vsocket_cnt;
pthread_mutex_t mutex;
};
#define MAX_VIRTIO_BACKLOG 128
static void vhost_user_server_new_connection(int fd, void *data, int *remove);
static void vhost_user_read_cb(int fd, void *dat, int *remove);
static int create_unix_socket(struct vhost_user_socket *vsocket);
static int vhost_user_start_client(struct vhost_user_socket *vsocket);
static struct vhost_user vhost_user = {
.fdset = {
.fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
.fd_mutex = PTHREAD_MUTEX_INITIALIZER,
.num = 0
},
.vsocket_cnt = 0,
.mutex = PTHREAD_MUTEX_INITIALIZER,
};
/* return bytes# of read on success or negative val on failure. */
int
read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
{
struct iovec iov;
struct msghdr msgh;
size_t fdsize = fd_num * sizeof(int);
char control[CMSG_SPACE(fdsize)];
struct cmsghdr *cmsg;
int got_fds = 0;
int ret;
memset(&msgh, 0, sizeof(msgh));
iov.iov_base = buf;
iov.iov_len = buflen;
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_control = control;
msgh.msg_controllen = sizeof(control);
ret = recvmsg(sockfd, &msgh, 0);
if (ret <= 0) {
RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
return ret;
}
if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
return -1;
}
for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
if ((cmsg->cmsg_level == SOL_SOCKET) &&
(cmsg->cmsg_type == SCM_RIGHTS)) {
got_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
memcpy(fds, CMSG_DATA(cmsg), got_fds * sizeof(int));
break;
}
}
/* Clear out unused file descriptors */
while (got_fds < fd_num)
fds[got_fds++] = -1;
return ret;
}
int
send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
{
struct iovec iov;
struct msghdr msgh;
size_t fdsize = fd_num * sizeof(int);
char control[CMSG_SPACE(fdsize)];
struct cmsghdr *cmsg;
int ret;
memset(&msgh, 0, sizeof(msgh));
iov.iov_base = buf;
iov.iov_len = buflen;
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
if (fds && fd_num > 0) {
msgh.msg_control = control;
msgh.msg_controllen = sizeof(control);
cmsg = CMSG_FIRSTHDR(&msgh);
if (cmsg == NULL) {
RTE_LOG(ERR, VHOST_CONFIG, "cmsg == NULL\n");
errno = EINVAL;
return -1;
}
cmsg->cmsg_len = CMSG_LEN(fdsize);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
memcpy(CMSG_DATA(cmsg), fds, fdsize);
} else {
msgh.msg_control = NULL;
msgh.msg_controllen = 0;
}
do {
ret = sendmsg(sockfd, &msgh, MSG_NOSIGNAL);
} while (ret < 0 && errno == EINTR);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG, "sendmsg error\n");
return ret;
}
return ret;
}
static void
vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
{
int vid;
size_t size;
struct vhost_user_connection *conn;
int ret;
conn = malloc(sizeof(*conn));
if (conn == NULL) {
close(fd);
return;
}
vid = vhost_new_device();
if (vid == -1) {
goto err;
}
size = strnlen(vsocket->path, PATH_MAX);
vhost_set_ifname(vid, vsocket->path, size);
vhost_set_builtin_virtio_net(vid, vsocket->use_builtin_virtio_net);
vhost_attach_vdpa_device(vid, vsocket->vdpa_dev_id);
if (vsocket->dequeue_zero_copy)
vhost_enable_dequeue_zero_copy(vid);
RTE_LOG(INFO, VHOST_CONFIG, "new device, handle is %d\n", vid);
if (vsocket->notify_ops->new_connection) {
ret = vsocket->notify_ops->new_connection(vid);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to add vhost user connection with fd %d\n",
fd);
goto err;
}
}
conn->connfd = fd;
conn->vsocket = vsocket;
conn->vid = vid;
ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
NULL, conn);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to add fd %d into vhost server fdset\n",
fd);
if (vsocket->notify_ops->destroy_connection)
vsocket->notify_ops->destroy_connection(conn->vid);
goto err;
}
pthread_mutex_lock(&vsocket->conn_mutex);
TAILQ_INSERT_TAIL(&vsocket->conn_list, conn, next);
pthread_mutex_unlock(&vsocket->conn_mutex);
fdset_pipe_notify(&vhost_user.fdset);
return;
err:
free(conn);
close(fd);
}
/* call back when there is new vhost-user connection from client */
static void
vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
{
struct vhost_user_socket *vsocket = dat;
fd = accept(fd, NULL, NULL);
if (fd < 0)
return;
RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
vhost_user_add_connection(fd, vsocket);
}
static void
vhost_user_read_cb(int connfd, void *dat, int *remove)
{
struct vhost_user_connection *conn = dat;
struct vhost_user_socket *vsocket = conn->vsocket;
int ret;
ret = vhost_user_msg_handler(conn->vid, connfd);
if (ret < 0) {
close(connfd);
*remove = 1;
vhost_destroy_device(conn->vid);
if (vsocket->notify_ops->destroy_connection)
vsocket->notify_ops->destroy_connection(conn->vid);
pthread_mutex_lock(&vsocket->conn_mutex);
TAILQ_REMOVE(&vsocket->conn_list, conn, next);
pthread_mutex_unlock(&vsocket->conn_mutex);
free(conn);
if (vsocket->reconnect) {
create_unix_socket(vsocket);
vhost_user_start_client(vsocket);
}
}
}
static int
create_unix_socket(struct vhost_user_socket *vsocket)
{
int fd;
struct sockaddr_un *un = &vsocket->un;
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -1;
RTE_LOG(INFO, VHOST_CONFIG, "vhost-user %s: socket created, fd: %d\n",
vsocket->is_server ? "server" : "client", fd);
if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
RTE_LOG(ERR, VHOST_CONFIG,
"vhost-user: can't set nonblocking mode for socket, fd: "
"%d (%s)\n", fd, strerror(errno));
close(fd);
return -1;
}
memset(un, 0, sizeof(*un));
un->sun_family = AF_UNIX;
strncpy(un->sun_path, vsocket->path, sizeof(un->sun_path));
un->sun_path[sizeof(un->sun_path) - 1] = '\0';
vsocket->socket_fd = fd;
return 0;
}
static int
vhost_user_start_server(struct vhost_user_socket *vsocket)
{
int ret;
int fd = vsocket->socket_fd;
const char *path = vsocket->path;
/*
* bind () may fail if the socket file with the same name already
* exists. But the library obviously should not delete the file
* provided by the user, since we can not be sure that it is not
* being used by other applications. Moreover, many applications form
* socket names based on user input, which is prone to errors.
*
* The user must ensure that the socket does not exist before
* registering the vhost driver in server mode.
*/
ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to bind to %s: %s; remove it and try again\n",
path, strerror(errno));
goto err;
}
RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
ret = listen(fd, MAX_VIRTIO_BACKLOG);
if (ret < 0)
goto err;
ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
NULL, vsocket);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to add listen fd %d to vhost server fdset\n",
fd);
goto err;
}
return 0;
err:
close(fd);
return -1;
}
struct vhost_user_reconnect {
struct sockaddr_un un;
int fd;
struct vhost_user_socket *vsocket;
TAILQ_ENTRY(vhost_user_reconnect) next;
};
TAILQ_HEAD(vhost_user_reconnect_tailq_list, vhost_user_reconnect);
struct vhost_user_reconnect_list {
struct vhost_user_reconnect_tailq_list head;
pthread_mutex_t mutex;
};
static struct vhost_user_reconnect_list reconn_list;
static pthread_t reconn_tid;
static int
vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
{
int ret, flags;
ret = connect(fd, un, sz);
if (ret < 0 && errno != EISCONN)
return -1;
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"can't get flags for connfd %d\n", fd);
return -2;
}
if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
RTE_LOG(ERR, VHOST_CONFIG,
"can't disable nonblocking on fd %d\n", fd);
return -2;
}
return 0;
}
static void *
vhost_user_client_reconnect(void *arg __rte_unused)
{
int ret;
struct vhost_user_reconnect *reconn, *next;
while (1) {
pthread_mutex_lock(&reconn_list.mutex);
/*
* An equal implementation of TAILQ_FOREACH_SAFE,
* which does not exist on all platforms.
*/
for (reconn = TAILQ_FIRST(&reconn_list.head);
reconn != NULL; reconn = next) {
next = TAILQ_NEXT(reconn, next);
ret = vhost_user_connect_nonblock(reconn->fd,
(struct sockaddr *)&reconn->un,
sizeof(reconn->un));
if (ret == -2) {
close(reconn->fd);
RTE_LOG(ERR, VHOST_CONFIG,
"reconnection for fd %d failed\n",
reconn->fd);
goto remove_fd;
}
if (ret == -1)
continue;
RTE_LOG(INFO, VHOST_CONFIG,
"%s: connected\n", reconn->vsocket->path);
vhost_user_add_connection(reconn->fd, reconn->vsocket);
remove_fd:
TAILQ_REMOVE(&reconn_list.head, reconn, next);
free(reconn);
}
pthread_mutex_unlock(&reconn_list.mutex);
sleep(1);
}
return NULL;
}
static int
vhost_user_reconnect_init(void)
{
int ret;
char thread_name[RTE_MAX_THREAD_NAME_LEN];
ret = pthread_mutex_init(&reconn_list.mutex, NULL);
if (ret < 0) {
RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
return ret;
}
TAILQ_INIT(&reconn_list.head);
ret = pthread_create(&reconn_tid, NULL,
vhost_user_client_reconnect, NULL);
if (ret != 0) {
RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
if (pthread_mutex_destroy(&reconn_list.mutex)) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to destroy reconnect mutex");
}
} else {
snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN,
"vhost-reconn");
if (rte_thread_setname(reconn_tid, thread_name)) {
RTE_LOG(DEBUG, VHOST_CONFIG,
"failed to set reconnect thread name");
}
}
return ret;
}
static int
vhost_user_start_client(struct vhost_user_socket *vsocket)
{
int ret;
int fd = vsocket->socket_fd;
const char *path = vsocket->path;
struct vhost_user_reconnect *reconn;
ret = vhost_user_connect_nonblock(fd, (struct sockaddr *)&vsocket->un,
sizeof(vsocket->un));
if (ret == 0) {
vhost_user_add_connection(fd, vsocket);
return 0;
}
RTE_LOG(WARNING, VHOST_CONFIG,
"failed to connect to %s: %s\n",
path, strerror(errno));
if (ret == -2 || !vsocket->reconnect) {
close(fd);
return -1;
}
RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
reconn = malloc(sizeof(*reconn));
if (reconn == NULL) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to allocate memory for reconnect\n");
close(fd);
return -1;
}
reconn->un = vsocket->un;
reconn->fd = fd;
reconn->vsocket = vsocket;
pthread_mutex_lock(&reconn_list.mutex);
TAILQ_INSERT_TAIL(&reconn_list.head, reconn, next);
pthread_mutex_unlock(&reconn_list.mutex);
return 0;
}
static struct vhost_user_socket *
find_vhost_user_socket(const char *path)
{
int i;
for (i = 0; i < vhost_user.vsocket_cnt; i++) {
struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
if (!strcmp(vsocket->path, path))
return vsocket;
}
return NULL;
}
int
rte_vhost_driver_attach_vdpa_device(const char *path, int did)
{
struct vhost_user_socket *vsocket;
if (rte_vdpa_get_device(did) == NULL)
return -1;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket)
vsocket->vdpa_dev_id = did;
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
int
rte_vhost_driver_detach_vdpa_device(const char *path)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket)
vsocket->vdpa_dev_id = -1;
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
int
rte_vhost_driver_get_vdpa_device_id(const char *path)
{
struct vhost_user_socket *vsocket;
int did = -1;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket)
did = vsocket->vdpa_dev_id;
pthread_mutex_unlock(&vhost_user.mutex);
return did;
}
int
rte_vhost_driver_disable_features(const char *path, uint64_t features)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
/* Note that use_builtin_virtio_net is not affected by this function
* since callers may want to selectively disable features of the
* built-in vhost net device backend.
*/
if (vsocket)
vsocket->features &= ~features;
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
int
rte_vhost_driver_enable_features(const char *path, uint64_t features)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket) {
if ((vsocket->supported_features & features) != features) {
/*
* trying to enable features the driver doesn't
* support.
*/
pthread_mutex_unlock(&vhost_user.mutex);
return -1;
}
vsocket->features |= features;
}
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
int
rte_vhost_driver_set_features(const char *path, uint64_t features)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket) {
vsocket->supported_features = features;
vsocket->features = features;
/* Anyone setting feature bits is implementing their own vhost
* device backend.
*/
vsocket->use_builtin_virtio_net = false;
}
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
int
rte_vhost_driver_get_features(const char *path, uint64_t *features)
{
struct vhost_user_socket *vsocket;
uint64_t vdpa_features;
struct rte_vdpa_device *vdpa_dev;
int did = -1;
int ret = 0;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (!vsocket) {
RTE_LOG(ERR, VHOST_CONFIG,
"socket file %s is not registered yet.\n", path);
ret = -1;
goto unlock_exit;
}
did = vsocket->vdpa_dev_id;
vdpa_dev = rte_vdpa_get_device(did);
if (!vdpa_dev || !vdpa_dev->ops->get_features) {
*features = vsocket->features;
goto unlock_exit;
}
if (vdpa_dev->ops->get_features(did, &vdpa_features) < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to get vdpa features "
"for socket file %s.\n", path);
ret = -1;
goto unlock_exit;
}
*features = vsocket->features & vdpa_features;
unlock_exit:
pthread_mutex_unlock(&vhost_user.mutex);
return ret;
}
int
rte_vhost_driver_get_protocol_features(const char *path,
uint64_t *protocol_features)
{
struct vhost_user_socket *vsocket;
uint64_t vdpa_protocol_features;
struct rte_vdpa_device *vdpa_dev;
int did = -1;
int ret = 0;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (!vsocket) {
RTE_LOG(ERR, VHOST_CONFIG,
"socket file %s is not registered yet.\n", path);
ret = -1;
goto unlock_exit;
}
did = vsocket->vdpa_dev_id;
vdpa_dev = rte_vdpa_get_device(did);
if (!vdpa_dev || !vdpa_dev->ops->get_protocol_features) {
*protocol_features = VHOST_USER_PROTOCOL_FEATURES;
goto unlock_exit;
}
if (vdpa_dev->ops->get_protocol_features(did,
&vdpa_protocol_features) < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to get vdpa protocol features "
"for socket file %s.\n", path);
ret = -1;
goto unlock_exit;
}
*protocol_features = VHOST_USER_PROTOCOL_FEATURES
& vdpa_protocol_features;
unlock_exit:
pthread_mutex_unlock(&vhost_user.mutex);
return ret;
}
int
rte_vhost_driver_get_queue_num(const char *path, uint32_t *queue_num)
{
struct vhost_user_socket *vsocket;
uint32_t vdpa_queue_num;
struct rte_vdpa_device *vdpa_dev;
int did = -1;
int ret = 0;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (!vsocket) {
RTE_LOG(ERR, VHOST_CONFIG,
"socket file %s is not registered yet.\n", path);
ret = -1;
goto unlock_exit;
}
did = vsocket->vdpa_dev_id;
vdpa_dev = rte_vdpa_get_device(did);
if (!vdpa_dev || !vdpa_dev->ops->get_queue_num) {
*queue_num = VHOST_MAX_QUEUE_PAIRS;
goto unlock_exit;
}
if (vdpa_dev->ops->get_queue_num(did, &vdpa_queue_num) < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to get vdpa queue number "
"for socket file %s.\n", path);
ret = -1;
goto unlock_exit;
}
*queue_num = RTE_MIN((uint32_t)VHOST_MAX_QUEUE_PAIRS, vdpa_queue_num);
unlock_exit:
pthread_mutex_unlock(&vhost_user.mutex);
return ret;
}
/*
* Register a new vhost-user socket; here we could act as server
* (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
* is set.
*/
int
rte_vhost_driver_register(const char *path, uint64_t flags)
{
int ret = -1;
struct vhost_user_socket *vsocket;
if (!path)
return -1;
pthread_mutex_lock(&vhost_user.mutex);
if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
RTE_LOG(ERR, VHOST_CONFIG,
"error: the number of vhost sockets reaches maximum\n");
goto out;
}
vsocket = malloc(sizeof(struct vhost_user_socket));
if (!vsocket)
goto out;
memset(vsocket, 0, sizeof(struct vhost_user_socket));
vsocket->path = strdup(path);
if (vsocket->path == NULL) {
RTE_LOG(ERR, VHOST_CONFIG,
"error: failed to copy socket path string\n");
free(vsocket);
goto out;
}
TAILQ_INIT(&vsocket->conn_list);
ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
if (ret) {
RTE_LOG(ERR, VHOST_CONFIG,
"error: failed to init connection mutex\n");
goto out_free;
}
vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
/*
* Set the supported features correctly for the builtin vhost-user
* net driver.
*
* Applications know nothing about features the builtin virtio net
* driver (virtio_net.c) supports, thus it's not possible for them
* to invoke rte_vhost_driver_set_features(). To workaround it, here
* we set it unconditionally. If the application want to implement
* another vhost-user driver (say SCSI), it should call the
* rte_vhost_driver_set_features(), which will overwrite following
* two values.
*/
vsocket->use_builtin_virtio_net = true;
vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
vsocket->features = VIRTIO_NET_SUPPORTED_FEATURES;
if (!(flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
vsocket->supported_features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
vsocket->features &= ~(1ULL << VIRTIO_F_IOMMU_PLATFORM);
}
if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
if (vsocket->reconnect && reconn_tid == 0) {
if (vhost_user_reconnect_init() != 0)
goto out_mutex;
}
} else {
vsocket->is_server = true;
}
ret = create_unix_socket(vsocket);
if (ret < 0) {
goto out_mutex;
}
vhost_user.vsockets[vhost_user.vsocket_cnt++] = vsocket;
pthread_mutex_unlock(&vhost_user.mutex);
return ret;
out_mutex:
if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
RTE_LOG(ERR, VHOST_CONFIG,
"error: failed to destroy connection mutex\n");
}
out_free:
free(vsocket->path);
free(vsocket);
out:
pthread_mutex_unlock(&vhost_user.mutex);
return ret;
}
static bool
vhost_user_remove_reconnect(struct vhost_user_socket *vsocket)
{
int found = false;
struct vhost_user_reconnect *reconn, *next;
pthread_mutex_lock(&reconn_list.mutex);
for (reconn = TAILQ_FIRST(&reconn_list.head);
reconn != NULL; reconn = next) {
next = TAILQ_NEXT(reconn, next);
if (reconn->vsocket == vsocket) {
TAILQ_REMOVE(&reconn_list.head, reconn, next);
close(reconn->fd);
free(reconn);
found = true;
break;
}
}
pthread_mutex_unlock(&reconn_list.mutex);
return found;
}
/**
* Unregister the specified vhost socket
*/
int
rte_vhost_driver_unregister(const char *path)
{
int i;
int count;
struct vhost_user_connection *conn, *next;
pthread_mutex_lock(&vhost_user.mutex);
for (i = 0; i < vhost_user.vsocket_cnt; i++) {
struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
if (!strcmp(vsocket->path, path)) {
if (vsocket->is_server) {
fdset_del(&vhost_user.fdset, vsocket->socket_fd);
close(vsocket->socket_fd);
unlink(path);
} else if (vsocket->reconnect) {
vhost_user_remove_reconnect(vsocket);
}
pthread_mutex_lock(&vsocket->conn_mutex);
for (conn = TAILQ_FIRST(&vsocket->conn_list);
conn != NULL;
conn = next) {
next = TAILQ_NEXT(conn, next);
fdset_del(&vhost_user.fdset, conn->connfd);
RTE_LOG(INFO, VHOST_CONFIG,
"free connfd = %d for device '%s'\n",
conn->connfd, path);
close(conn->connfd);
vhost_destroy_device(conn->vid);
TAILQ_REMOVE(&vsocket->conn_list, conn, next);
free(conn);
}
pthread_mutex_unlock(&vsocket->conn_mutex);
pthread_mutex_destroy(&vsocket->conn_mutex);
free(vsocket->path);
free(vsocket);
count = --vhost_user.vsocket_cnt;
vhost_user.vsockets[i] = vhost_user.vsockets[count];
vhost_user.vsockets[count] = NULL;
pthread_mutex_unlock(&vhost_user.mutex);
return 0;
}
}
pthread_mutex_unlock(&vhost_user.mutex);
return -1;
}
/*
* Register ops so that we can add/remove device to data core.
*/
int
rte_vhost_driver_callback_register(const char *path,
struct vhost_device_ops const * const ops)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
if (vsocket)
vsocket->notify_ops = ops;
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? 0 : -1;
}
struct vhost_device_ops const *
vhost_driver_callback_get(const char *path)
{
struct vhost_user_socket *vsocket;
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
pthread_mutex_unlock(&vhost_user.mutex);
return vsocket ? vsocket->notify_ops : NULL;
}
int
rte_vhost_driver_start(const char *path)
{
struct vhost_user_socket *vsocket;
static pthread_t fdset_tid;
char thread_name[RTE_MAX_THREAD_NAME_LEN];
pthread_mutex_lock(&vhost_user.mutex);
vsocket = find_vhost_user_socket(path);
pthread_mutex_unlock(&vhost_user.mutex);
if (!vsocket)
return -1;
if (fdset_tid == 0) {
/**
* create a pipe which will be waited by poll and notified to
* rebuild the wait list of poll.
*/
if (fdset_pipe_init(&vhost_user.fdset) < 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to create pipe for vhost fdset\n");
return -1;
}
int ret = pthread_create(&fdset_tid, NULL, fdset_event_dispatch,
&vhost_user.fdset);
if (ret != 0) {
RTE_LOG(ERR, VHOST_CONFIG,
"failed to create fdset handling thread");
fdset_pipe_uninit(&vhost_user.fdset);
return -1;
} else {
snprintf(thread_name, RTE_MAX_THREAD_NAME_LEN,
"vhost-events");
if (rte_thread_setname(fdset_tid, thread_name)) {
RTE_LOG(DEBUG, VHOST_CONFIG,
"failed to set vhost-event thread name");
}
}
}
if (vsocket->is_server)
return vhost_user_start_server(vsocket);
else
return vhost_user_start_client(vsocket);
}