vhost: replace vDPA device ID in Vhost
[dpdk.git] / lib / librte_vhost / socket.c
index 4ce916d..49267ce 100644 (file)
@@ -40,6 +40,8 @@ struct vhost_user_socket {
        bool dequeue_zero_copy;
        bool iommu_support;
        bool use_builtin_virtio_net;
+       bool extbuf;
+       bool linearbuf;
 
        /*
         * The "supported_features" indicates the feature bits the
@@ -51,12 +53,9 @@ struct vhost_user_socket {
        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;
+       uint64_t protocol_features;
+
+       struct rte_vdpa_device *vdpa_dev;
 
        struct vhost_device_ops const *notify_ops;
 };
@@ -88,24 +87,30 @@ static struct vhost_user vhost_user = {
        .fdset = {
                .fd = { [0 ... MAX_FDS - 1] = {-1, NULL, NULL, NULL, 0} },
                .fd_mutex = PTHREAD_MUTEX_INITIALIZER,
+               .fd_pooling_mutex = PTHREAD_MUTEX_INITIALIZER,
                .num = 0
        },
        .vsocket_cnt = 0,
        .mutex = PTHREAD_MUTEX_INITIALIZER,
 };
 
-/* return bytes# of read on success or negative val on failure. */
+/*
+ * return bytes# of read on success or negative val on failure. Update fdnum
+ * with number of fds read.
+ */
 int
-read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
+read_fd_message(int sockfd, char *buf, int buflen, int *fds, int max_fds,
+               int *fd_num)
 {
        struct iovec iov;
        struct msghdr msgh;
-       size_t fdsize = fd_num * sizeof(int);
-       char control[CMSG_SPACE(fdsize)];
+       char control[CMSG_SPACE(max_fds * sizeof(int))];
        struct cmsghdr *cmsg;
        int got_fds = 0;
        int ret;
 
+       *fd_num = 0;
+
        memset(&msgh, 0, sizeof(msgh));
        iov.iov_base = buf;
        iov.iov_len  = buflen;
@@ -117,12 +122,13 @@ read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
 
        ret = recvmsg(sockfd, &msgh, 0);
        if (ret <= 0) {
-               RTE_LOG(ERR, VHOST_CONFIG, "recvmsg failed\n");
+               if (ret)
+                       VHOST_LOG_CONFIG(ERR, "recvmsg failed\n");
                return ret;
        }
 
        if (msgh.msg_flags & (MSG_TRUNC | MSG_CTRUNC)) {
-               RTE_LOG(ERR, VHOST_CONFIG, "truncted msg\n");
+               VHOST_LOG_CONFIG(ERR, "truncated msg\n");
                return -1;
        }
 
@@ -131,13 +137,14 @@ read_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
                if ((cmsg->cmsg_level == SOL_SOCKET) &&
                        (cmsg->cmsg_type == SCM_RIGHTS)) {
                        got_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
+                       *fd_num = got_fds;
                        memcpy(fds, CMSG_DATA(cmsg), got_fds * sizeof(int));
                        break;
                }
        }
 
        /* Clear out unused file descriptors */
-       while (got_fds < fd_num)
+       while (got_fds < max_fds)
                fds[got_fds++] = -1;
 
        return ret;
@@ -166,7 +173,7 @@ send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
                msgh.msg_controllen = sizeof(control);
                cmsg = CMSG_FIRSTHDR(&msgh);
                if (cmsg == NULL) {
-                       RTE_LOG(ERR, VHOST_CONFIG, "cmsg == NULL\n");
+                       VHOST_LOG_CONFIG(ERR, "cmsg == NULL\n");
                        errno = EINVAL;
                        return -1;
                }
@@ -184,7 +191,7 @@ send_fd_message(int sockfd, char *buf, int buflen, int *fds, int fd_num)
        } while (ret < 0 && errno == EINTR);
 
        if (ret < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,  "sendmsg error\n");
+               VHOST_LOG_CONFIG(ERR,  "sendmsg error\n");
                return ret;
        }
 
@@ -199,6 +206,9 @@ vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
        struct vhost_user_connection *conn;
        int ret;
 
+       if (vsocket == NULL)
+               return;
+
        conn = malloc(sizeof(*conn));
        if (conn == NULL) {
                close(fd);
@@ -215,20 +225,26 @@ vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
 
        vhost_set_builtin_virtio_net(vid, vsocket->use_builtin_virtio_net);
 
-       vhost_attach_vdpa_device(vid, vsocket->vdpa_dev_id);
+       vhost_attach_vdpa_device(vid, vsocket->vdpa_dev);
 
        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->extbuf)
+               vhost_enable_extbuf(vid);
+
+       if (vsocket->linearbuf)
+               vhost_enable_linearbuf(vid);
+
+       VHOST_LOG_CONFIG(INFO, "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,
+                       VHOST_LOG_CONFIG(ERR,
                                "failed to add vhost user connection with fd %d\n",
                                fd);
-                       goto err;
+                       goto err_cleanup;
                }
        }
 
@@ -238,14 +254,14 @@ vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
        ret = fdset_add(&vhost_user.fdset, fd, vhost_user_read_cb,
                        NULL, conn);
        if (ret < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "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;
+               goto err_cleanup;
        }
 
        pthread_mutex_lock(&vsocket->conn_mutex);
@@ -255,6 +271,8 @@ vhost_user_add_connection(int fd, struct vhost_user_socket *vsocket)
        fdset_pipe_notify(&vhost_user.fdset);
        return;
 
+err_cleanup:
+       vhost_destroy_device(vid);
 err:
        free(conn);
        close(fd);
@@ -270,7 +288,7 @@ vhost_user_server_new_connection(int fd, void *dat, int *remove __rte_unused)
        if (fd < 0)
                return;
 
-       RTE_LOG(INFO, VHOST_CONFIG, "new vhost user connection is %d\n", fd);
+       VHOST_LOG_CONFIG(INFO, "new vhost user connection is %d\n", fd);
        vhost_user_add_connection(fd, vsocket);
 }
 
@@ -283,23 +301,29 @@ vhost_user_read_cb(int connfd, void *dat, int *remove)
 
        ret = vhost_user_msg_handler(conn->vid, connfd);
        if (ret < 0) {
+               struct virtio_net *dev = get_device(conn->vid);
+
                close(connfd);
                *remove = 1;
-               vhost_destroy_device(conn->vid);
+
+               if (dev)
+                       vhost_destroy_device_notify(dev);
 
                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);
+               vhost_destroy_device(conn->vid);
 
                if (vsocket->reconnect) {
                        create_unix_socket(vsocket);
                        vhost_user_start_client(vsocket);
                }
+
+               pthread_mutex_lock(&vsocket->conn_mutex);
+               TAILQ_REMOVE(&vsocket->conn_list, conn, next);
+               pthread_mutex_unlock(&vsocket->conn_mutex);
+
+               free(conn);
        }
 }
 
@@ -312,11 +336,11 @@ create_unix_socket(struct vhost_user_socket *vsocket)
        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",
+       VHOST_LOG_CONFIG(INFO, "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_LOG_CONFIG(ERR,
                        "vhost-user: can't set nonblocking mode for socket, fd: "
                        "%d (%s)\n", fd, strerror(errno));
                close(fd);
@@ -351,12 +375,12 @@ vhost_user_start_server(struct vhost_user_socket *vsocket)
         */
        ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
        if (ret < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "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);
+       VHOST_LOG_CONFIG(INFO, "bind to %s\n", path);
 
        ret = listen(fd, MAX_VIRTIO_BACKLOG);
        if (ret < 0)
@@ -365,7 +389,7 @@ vhost_user_start_server(struct vhost_user_socket *vsocket)
        ret = fdset_add(&vhost_user.fdset, fd, vhost_user_server_new_connection,
                  NULL, vsocket);
        if (ret < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "failed to add listen fd %d to vhost server fdset\n",
                        fd);
                goto err;
@@ -406,12 +430,12 @@ vhost_user_connect_nonblock(int fd, struct sockaddr *un, size_t sz)
 
        flags = fcntl(fd, F_GETFL, 0);
        if (flags < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "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,
+               VHOST_LOG_CONFIG(ERR,
                                "can't disable nonblocking on fd %d\n", fd);
                return -2;
        }
@@ -440,7 +464,7 @@ vhost_user_client_reconnect(void *arg __rte_unused)
                                                sizeof(reconn->un));
                        if (ret == -2) {
                                close(reconn->fd);
-                               RTE_LOG(ERR, VHOST_CONFIG,
+                               VHOST_LOG_CONFIG(ERR,
                                        "reconnection for fd %d failed\n",
                                        reconn->fd);
                                goto remove_fd;
@@ -448,7 +472,7 @@ vhost_user_client_reconnect(void *arg __rte_unused)
                        if (ret == -1)
                                continue;
 
-                       RTE_LOG(INFO, VHOST_CONFIG,
+                       VHOST_LOG_CONFIG(INFO,
                                "%s: connected\n", reconn->vsocket->path);
                        vhost_user_add_connection(reconn->fd, reconn->vsocket);
 remove_fd:
@@ -470,7 +494,7 @@ vhost_user_reconnect_init(void)
 
        ret = pthread_mutex_init(&reconn_list.mutex, NULL);
        if (ret < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG, "failed to initialize mutex");
+               VHOST_LOG_CONFIG(ERR, "failed to initialize mutex");
                return ret;
        }
        TAILQ_INIT(&reconn_list.head);
@@ -478,9 +502,9 @@ vhost_user_reconnect_init(void)
        ret = rte_ctrl_thread_create(&reconn_tid, "vhost_reconn", NULL,
                             vhost_user_client_reconnect, NULL);
        if (ret != 0) {
-               RTE_LOG(ERR, VHOST_CONFIG, "failed to create reconnect thread");
+               VHOST_LOG_CONFIG(ERR, "failed to create reconnect thread");
                if (pthread_mutex_destroy(&reconn_list.mutex)) {
-                       RTE_LOG(ERR, VHOST_CONFIG,
+                       VHOST_LOG_CONFIG(ERR,
                                "failed to destroy reconnect mutex");
                }
        }
@@ -503,7 +527,7 @@ vhost_user_start_client(struct vhost_user_socket *vsocket)
                return 0;
        }
 
-       RTE_LOG(WARNING, VHOST_CONFIG,
+       VHOST_LOG_CONFIG(WARNING,
                "failed to connect to %s: %s\n",
                path, strerror(errno));
 
@@ -512,10 +536,10 @@ vhost_user_start_client(struct vhost_user_socket *vsocket)
                return -1;
        }
 
-       RTE_LOG(INFO, VHOST_CONFIG, "%s: reconnecting...\n", path);
+       VHOST_LOG_CONFIG(INFO, "%s: reconnecting...\n", path);
        reconn = malloc(sizeof(*reconn));
        if (reconn == NULL) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "failed to allocate memory for reconnect\n");
                close(fd);
                return -1;
@@ -535,6 +559,9 @@ find_vhost_user_socket(const char *path)
 {
        int i;
 
+       if (path == NULL)
+               return NULL;
+
        for (i = 0; i < vhost_user.vsocket_cnt; i++) {
                struct vhost_user_socket *vsocket = vhost_user.vsockets[i];
 
@@ -546,17 +573,18 @@ find_vhost_user_socket(const char *path)
 }
 
 int
-rte_vhost_driver_attach_vdpa_device(const char *path, int did)
+rte_vhost_driver_attach_vdpa_device(const char *path,
+               struct rte_vdpa_device *dev)
 {
        struct vhost_user_socket *vsocket;
 
-       if (rte_vdpa_get_device(did) == NULL)
+       if (dev == NULL || path == NULL)
                return -1;
 
        pthread_mutex_lock(&vhost_user.mutex);
        vsocket = find_vhost_user_socket(path);
        if (vsocket)
-               vsocket->vdpa_dev_id = did;
+               vsocket->vdpa_dev = dev;
        pthread_mutex_unlock(&vhost_user.mutex);
 
        return vsocket ? 0 : -1;
@@ -570,25 +598,25 @@ rte_vhost_driver_detach_vdpa_device(const char *path)
        pthread_mutex_lock(&vhost_user.mutex);
        vsocket = find_vhost_user_socket(path);
        if (vsocket)
-               vsocket->vdpa_dev_id = -1;
+               vsocket->vdpa_dev = NULL;
        pthread_mutex_unlock(&vhost_user.mutex);
 
        return vsocket ? 0 : -1;
 }
 
-int
-rte_vhost_driver_get_vdpa_device_id(const char *path)
+struct rte_vdpa_device *
+rte_vhost_driver_get_vdpa_device(const char *path)
 {
        struct vhost_user_socket *vsocket;
-       int did = -1;
+       struct rte_vdpa_device *dev = NULL;
 
        pthread_mutex_lock(&vhost_user.mutex);
        vsocket = find_vhost_user_socket(path);
        if (vsocket)
-               did = vsocket->vdpa_dev_id;
+               dev = vsocket->vdpa_dev;
        pthread_mutex_unlock(&vhost_user.mutex);
 
-       return did;
+       return dev;
 }
 
 int
@@ -661,27 +689,25 @@ 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,
+               VHOST_LOG_CONFIG(ERR,
                        "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);
+       vdpa_dev = vsocket->vdpa_dev;
        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,
+       if (vdpa_dev->ops->get_features(vdpa_dev, &vdpa_features) < 0) {
+               VHOST_LOG_CONFIG(ERR,
                                "failed to get vdpa features "
                                "for socket file %s.\n", path);
                ret = -1;
@@ -695,6 +721,20 @@ unlock_exit:
        return ret;
 }
 
+int
+rte_vhost_driver_set_protocol_features(const char *path,
+               uint64_t protocol_features)
+{
+       struct vhost_user_socket *vsocket;
+
+       pthread_mutex_lock(&vhost_user.mutex);
+       vsocket = find_vhost_user_socket(path);
+       if (vsocket)
+               vsocket->protocol_features = protocol_features;
+       pthread_mutex_unlock(&vhost_user.mutex);
+       return vsocket ? 0 : -1;
+}
+
 int
 rte_vhost_driver_get_protocol_features(const char *path,
                uint64_t *protocol_features)
@@ -702,35 +742,33 @@ rte_vhost_driver_get_protocol_features(const char *path,
        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,
+               VHOST_LOG_CONFIG(ERR,
                        "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);
+       vdpa_dev = vsocket->vdpa_dev;
        if (!vdpa_dev || !vdpa_dev->ops->get_protocol_features) {
-               *protocol_features = VHOST_USER_PROTOCOL_FEATURES;
+               *protocol_features = vsocket->protocol_features;
                goto unlock_exit;
        }
 
-       if (vdpa_dev->ops->get_protocol_features(did,
+       if (vdpa_dev->ops->get_protocol_features(vdpa_dev,
                                &vdpa_protocol_features) < 0) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                                "failed to get vdpa protocol features "
                                "for socket file %s.\n", path);
                ret = -1;
                goto unlock_exit;
        }
 
-       *protocol_features = VHOST_USER_PROTOCOL_FEATURES
+       *protocol_features = vsocket->protocol_features
                & vdpa_protocol_features;
 
 unlock_exit:
@@ -744,27 +782,25 @@ 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,
+               VHOST_LOG_CONFIG(ERR,
                        "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);
+       vdpa_dev = vsocket->vdpa_dev;
        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,
+       if (vdpa_dev->ops->get_queue_num(vdpa_dev, &vdpa_queue_num) < 0) {
+               VHOST_LOG_CONFIG(ERR,
                                "failed to get vdpa queue number "
                                "for socket file %s.\n", path);
                ret = -1;
@@ -778,6 +814,20 @@ unlock_exit:
        return ret;
 }
 
+static void
+vhost_user_socket_mem_free(struct vhost_user_socket *vsocket)
+{
+       if (vsocket && vsocket->path) {
+               free(vsocket->path);
+               vsocket->path = NULL;
+       }
+
+       if (vsocket) {
+               free(vsocket);
+               vsocket = NULL;
+       }
+}
+
 /*
  * Register a new vhost-user socket; here we could act as server
  * (the default case), or client (when RTE_VHOST_USER_CLIENT) flag
@@ -795,7 +845,7 @@ rte_vhost_driver_register(const char *path, uint64_t flags)
        pthread_mutex_lock(&vhost_user.mutex);
 
        if (vhost_user.vsocket_cnt == MAX_VHOST_SOCKET) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "error: the number of vhost sockets reaches maximum\n");
                goto out;
        }
@@ -806,19 +856,30 @@ rte_vhost_driver_register(const char *path, uint64_t flags)
        memset(vsocket, 0, sizeof(struct vhost_user_socket));
        vsocket->path = strdup(path);
        if (vsocket->path == NULL) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "error: failed to copy socket path string\n");
-               free(vsocket);
+               vhost_user_socket_mem_free(vsocket);
                goto out;
        }
        TAILQ_INIT(&vsocket->conn_list);
        ret = pthread_mutex_init(&vsocket->conn_mutex, NULL);
        if (ret) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "error: failed to init connection mutex\n");
                goto out_free;
        }
+       vsocket->vdpa_dev = NULL;
        vsocket->dequeue_zero_copy = flags & RTE_VHOST_USER_DEQUEUE_ZERO_COPY;
+       vsocket->extbuf = flags & RTE_VHOST_USER_EXTBUF_SUPPORT;
+       vsocket->linearbuf = flags & RTE_VHOST_USER_LINEARBUF_SUPPORT;
+
+       if (vsocket->dequeue_zero_copy &&
+           (flags & RTE_VHOST_USER_IOMMU_SUPPORT)) {
+               VHOST_LOG_CONFIG(ERR,
+                       "error: enabling dequeue zero copy and IOMMU features "
+                       "simultaneously is not supported\n");
+               goto out_mutex;
+       }
 
        /*
         * Set the supported features correctly for the builtin vhost-user
@@ -835,12 +896,76 @@ rte_vhost_driver_register(const char *path, uint64_t flags)
        vsocket->use_builtin_virtio_net = true;
        vsocket->supported_features = VIRTIO_NET_SUPPORTED_FEATURES;
        vsocket->features           = VIRTIO_NET_SUPPORTED_FEATURES;
+       vsocket->protocol_features  = VHOST_USER_PROTOCOL_FEATURES;
+
+       /*
+        * Dequeue zero copy can't assure descriptors returned in order.
+        * Also, it requires that the guest memory is populated, which is
+        * not compatible with postcopy.
+        */
+       if (vsocket->dequeue_zero_copy) {
+               if (vsocket->extbuf) {
+                       VHOST_LOG_CONFIG(ERR,
+                       "error: zero copy is incompatible with external buffers\n");
+                       ret = -1;
+                       goto out_mutex;
+               }
+               if (vsocket->linearbuf) {
+                       VHOST_LOG_CONFIG(ERR,
+                       "error: zero copy is incompatible with linear buffers\n");
+                       ret = -1;
+                       goto out_mutex;
+               }
+               if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
+                       VHOST_LOG_CONFIG(ERR,
+                       "error: zero copy is incompatible with vhost client mode\n");
+                       ret = -1;
+                       goto out_mutex;
+               }
+               vsocket->supported_features &= ~(1ULL << VIRTIO_F_IN_ORDER);
+               vsocket->features &= ~(1ULL << VIRTIO_F_IN_ORDER);
+
+               VHOST_LOG_CONFIG(INFO,
+                       "Dequeue zero copy requested, disabling postcopy support\n");
+               vsocket->protocol_features &=
+                       ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
+       }
+
+       /*
+        * We'll not be able to receive a buffer from guest in linear mode
+        * without external buffer if it will not fit in a single mbuf, which is
+        * likely if segmentation offloading enabled.
+        */
+       if (vsocket->linearbuf && !vsocket->extbuf) {
+               uint64_t seg_offload_features =
+                               (1ULL << VIRTIO_NET_F_HOST_TSO4) |
+                               (1ULL << VIRTIO_NET_F_HOST_TSO6) |
+                               (1ULL << VIRTIO_NET_F_HOST_UFO);
+
+               VHOST_LOG_CONFIG(INFO,
+                       "Linear buffers requested without external buffers, "
+                       "disabling host segmentation offloading support\n");
+               vsocket->supported_features &= ~seg_offload_features;
+               vsocket->features &= ~seg_offload_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_POSTCOPY_SUPPORT)) {
+               vsocket->protocol_features &=
+                       ~(1ULL << VHOST_USER_PROTOCOL_F_PAGEFAULT);
+       } else {
+#ifndef RTE_LIBRTE_VHOST_POSTCOPY
+               VHOST_LOG_CONFIG(ERR,
+                       "Postcopy requested but not compiled\n");
+               ret = -1;
+               goto out_mutex;
+#endif
+       }
+
        if ((flags & RTE_VHOST_USER_CLIENT) != 0) {
                vsocket->reconnect = !(flags & RTE_VHOST_USER_NO_RECONNECT);
                if (vsocket->reconnect && reconn_tid == 0) {
@@ -862,12 +987,11 @@ rte_vhost_driver_register(const char *path, uint64_t flags)
 
 out_mutex:
        if (pthread_mutex_destroy(&vsocket->conn_mutex)) {
-               RTE_LOG(ERR, VHOST_CONFIG,
+               VHOST_LOG_CONFIG(ERR,
                        "error: failed to destroy connection mutex\n");
        }
 out_free:
-       free(vsocket->path);
-       free(vsocket);
+       vhost_user_socket_mem_free(vsocket);
 out:
        pthread_mutex_unlock(&vhost_user.mutex);
 
@@ -908,21 +1032,16 @@ rte_vhost_driver_unregister(const char *path)
        int count;
        struct vhost_user_connection *conn, *next;
 
+       if (path == NULL)
+               return -1;
+
+again:
        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);
-                       }
-
-again:
                        pthread_mutex_lock(&vsocket->conn_mutex);
                        for (conn = TAILQ_FIRST(&vsocket->conn_list);
                             conn != NULL;
@@ -930,18 +1049,20 @@ again:
                                next = TAILQ_NEXT(conn, next);
 
                                /*
-                                * If r/wcb is executing, release the
-                                * conn_mutex lock, and try again since
-                                * the r/wcb may use the conn_mutex lock.
+                                * If r/wcb is executing, release vsocket's
+                                * conn_mutex and vhost_user's mutex locks, and
+                                * try again since the r/wcb may use the
+                                * conn_mutex and mutex locks.
                                 */
                                if (fdset_try_del(&vhost_user.fdset,
                                                  conn->connfd) == -1) {
                                        pthread_mutex_unlock(
                                                        &vsocket->conn_mutex);
+                                       pthread_mutex_unlock(&vhost_user.mutex);
                                        goto again;
                                }
 
-                               RTE_LOG(INFO, VHOST_CONFIG,
+                               VHOST_LOG_CONFIG(INFO,
                                        "free connfd = %d for device '%s'\n",
                                        conn->connfd, path);
                                close(conn->connfd);
@@ -951,9 +1072,26 @@ again:
                        }
                        pthread_mutex_unlock(&vsocket->conn_mutex);
 
+                       if (vsocket->is_server) {
+                               /*
+                                * If r/wcb is executing, release vhost_user's
+                                * mutex lock, and try again since the r/wcb
+                                * may use the mutex lock.
+                                */
+                               if (fdset_try_del(&vhost_user.fdset,
+                                               vsocket->socket_fd) == -1) {
+                                       pthread_mutex_unlock(&vhost_user.mutex);
+                                       goto again;
+                               }
+
+                               close(vsocket->socket_fd);
+                               unlink(path);
+                       } else if (vsocket->reconnect) {
+                               vhost_user_remove_reconnect(vsocket);
+                       }
+
                        pthread_mutex_destroy(&vsocket->conn_mutex);
-                       free(vsocket->path);
-                       free(vsocket);
+                       vhost_user_socket_mem_free(vsocket);
 
                        count = --vhost_user.vsocket_cnt;
                        vhost_user.vsockets[i] = vhost_user.vsockets[count];
@@ -1017,7 +1155,7 @@ rte_vhost_driver_start(const char *path)
                 * rebuild the wait list of poll.
                 */
                if (fdset_pipe_init(&vhost_user.fdset) < 0) {
-                       RTE_LOG(ERR, VHOST_CONFIG,
+                       VHOST_LOG_CONFIG(ERR,
                                "failed to create pipe for vhost fdset\n");
                        return -1;
                }
@@ -1026,7 +1164,7 @@ rte_vhost_driver_start(const char *path)
                        "vhost-events", NULL, fdset_event_dispatch,
                        &vhost_user.fdset);
                if (ret != 0) {
-                       RTE_LOG(ERR, VHOST_CONFIG,
+                       VHOST_LOG_CONFIG(ERR,
                                "failed to create fdset handling thread");
 
                        fdset_pipe_uninit(&vhost_user.fdset);