casaroli commented on code in PR #20963: URL: https://github.com/apache/nuttx/pull/20963#discussion_r4392216336
########## drivers/vhost/vhost-serial.c: ########## @@ -0,0 +1,407 @@ +/**************************************************************************** + * drivers/vhost/vhost-serial.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <debug.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> + +#include <nuttx/lib/lib.h> +#include <nuttx/kthread.h> +#include <nuttx/spinlock.h> +#include <nuttx/vhost/vhost.h> +#include <nuttx/virtio/virtio-config.h> +#include <nuttx/virtio/virtio-serial.h> + +#include "vhost-serial.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct vhost_serial_priv_s +{ + FAR struct vhost_device *hdev; + struct file serial; + sem_t semrx; + sem_t semtx; + pid_t pidrx; + pid_t pidtx; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev); +static void vhost_serial_remove(FAR struct vhost_device *hdev); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct vhost_driver g_vhost_serial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_serial_driver.node), /* node */ + VIRTIO_ID_CONSOLE, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +static struct vhost_driver g_vhost_rprocserial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_rprocserial_driver.node), /* node */ + VIRTIO_ID_RPROC_SERIAL, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t vhost_serial_safe_write(FAR struct vhost_serial_priv_s *priv, + FAR void *buf, uint32_t len) +{ + size_t written = 0; + ssize_t ret; + + while (written < len) + { + ret = file_write(&priv->serial, buf + written, + len - written); + if (ret <= 0) + { + vhosterr("File write data failed %zd\n", ret); + return ret; + } + + written += ret; + } + + return written; +} + +/**************************************************************************** + * Name: vhost_serial_tx_worker + ****************************************************************************/ + +static void vhost_serial_tx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_TX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + /* Write data to actual serial port */ + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = vhost_serial_safe_write(priv, vb[i].buf, vb[i].len); + if (ret <= 0) + { + break; + } + + len += ret; + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_tx_thread + ****************************************************************************/ + +static int vhost_serial_tx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semtx); + vhost_serial_tx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_tx_handler + ****************************************************************************/ + +static void vhost_serial_tx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semtx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semtx); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_worker + ****************************************************************************/ + +static void vhost_serial_rx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_RX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = file_read(&priv->serial, vb[i].buf, vb[i].len); + if (ret < 0) + { + vhosterr("File read data failed %zd\n", ret); + break; + } + + len += ret; + if (ret < vb[i].len) + { + break; + } + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_thread + ****************************************************************************/ + +static int vhost_serial_rx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semrx); + vhost_serial_rx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_rx_handler + ****************************************************************************/ + +static void vhost_serial_rx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semrx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semrx); + } +} + +/**************************************************************************** + * Name: vhost_serial_probe + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev) +{ + FAR struct vhost_serial_priv_s *priv; + FAR const char *vqnames[VIRTIO_SERIAL_NUM]; + vq_callback callbacks[VIRTIO_SERIAL_NUM]; + char path[VIRTIO_SERIAL_PATH_SIZE]; + FAR char *name; + FAR char *argv[2]; + char arg0[32]; + int ret; + + /* Alloc the virtio serial driver and uart buffer */ + + priv = kmm_zalloc(sizeof(*priv)); + if (priv == NULL) + { + vhosterr("No enough memory\n"); + return -ENOMEM; + } + + priv->hdev = hdev; + hdev->priv = priv; + nxsem_init(&priv->semrx, 0, 0); + nxsem_init(&priv->semtx, 0, 0); + + /* Initialize actual serial port path */ + + vhost_read_config_member(priv->hdev, struct vhost_serial_config_s, + path, &path); + ret = file_open(&priv->serial, path, O_RDWR | O_NOCTTY | O_SYNC); + if (ret < 0) + { + vhosterr("Open %s failed, ret=%d\n", path, ret); + goto err_file_open; + } + + /* Initialize the vhost device */ + + vqnames[VIRTIO_SERIAL_RX] = "vhost_serial_rx"; + vqnames[VIRTIO_SERIAL_TX] = "vhost_serial_tx"; + callbacks[VIRTIO_SERIAL_RX] = vhost_serial_rx_handler; + callbacks[VIRTIO_SERIAL_TX] = vhost_serial_tx_handler; + ret = vhost_create_virtqueues(hdev, 0, VIRTIO_SERIAL_NUM, vqnames, + callbacks, NULL); + if (ret < 0) + { + vhosterr("vhost_device_create_virtqueue failed, ret=%d\n", ret); + goto err_init_vq; + } + + snprintf(arg0, sizeof(arg0), "%p", priv); + argv[0] = arg0; + argv[1] = NULL; + + name = lib_get_tempbuffer(PATH_MAX); + if (name == NULL) + { + ret = -ENOMEM; + goto err_init_name; + } + + snprintf(name, PATH_MAX, "vhost_serial_rx_%s", path); + priv->pidrx = kthread_create(name, + CONFIG_DRIVERS_VHOST_SERIAL_PRIORITY, + CONFIG_DRIVERS_VHOST_SERIAL_STACKSIZE, + vhost_serial_rx_thread, argv); + if (priv->pidrx < 0) Review Comment: When `kthread_create()` fails, `ret` is still 0, so probe frees `priv` and returns success. Fix: set `ret = priv->pidrx;` before this `goto` (and `ret = priv->pidtx;` at line 352). ########## drivers/vhost/vhost-serial.c: ########## @@ -0,0 +1,407 @@ +/**************************************************************************** + * drivers/vhost/vhost-serial.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <debug.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> + +#include <nuttx/lib/lib.h> +#include <nuttx/kthread.h> +#include <nuttx/spinlock.h> +#include <nuttx/vhost/vhost.h> +#include <nuttx/virtio/virtio-config.h> +#include <nuttx/virtio/virtio-serial.h> + +#include "vhost-serial.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct vhost_serial_priv_s +{ + FAR struct vhost_device *hdev; + struct file serial; + sem_t semrx; + sem_t semtx; + pid_t pidrx; + pid_t pidtx; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev); +static void vhost_serial_remove(FAR struct vhost_device *hdev); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct vhost_driver g_vhost_serial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_serial_driver.node), /* node */ + VIRTIO_ID_CONSOLE, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +static struct vhost_driver g_vhost_rprocserial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_rprocserial_driver.node), /* node */ + VIRTIO_ID_RPROC_SERIAL, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t vhost_serial_safe_write(FAR struct vhost_serial_priv_s *priv, + FAR void *buf, uint32_t len) +{ + size_t written = 0; + ssize_t ret; + + while (written < len) + { + ret = file_write(&priv->serial, buf + written, + len - written); + if (ret <= 0) + { + vhosterr("File write data failed %zd\n", ret); + return ret; + } + + written += ret; + } + + return written; +} + +/**************************************************************************** + * Name: vhost_serial_tx_worker + ****************************************************************************/ + +static void vhost_serial_tx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_TX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + /* Write data to actual serial port */ + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = vhost_serial_safe_write(priv, vb[i].buf, vb[i].len); + if (ret <= 0) + { + break; + } + + len += ret; + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_tx_thread + ****************************************************************************/ + +static int vhost_serial_tx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semtx); + vhost_serial_tx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_tx_handler + ****************************************************************************/ + +static void vhost_serial_tx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semtx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semtx); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_worker + ****************************************************************************/ + +static void vhost_serial_rx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_RX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = file_read(&priv->serial, vb[i].buf, vb[i].len); + if (ret < 0) + { + vhosterr("File read data failed %zd\n", ret); + break; + } + + len += ret; + if (ret < vb[i].len) + { + break; + } + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_thread + ****************************************************************************/ + +static int vhost_serial_rx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semrx); + vhost_serial_rx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_rx_handler + ****************************************************************************/ + +static void vhost_serial_rx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semrx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semrx); + } +} + +/**************************************************************************** + * Name: vhost_serial_probe + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev) +{ + FAR struct vhost_serial_priv_s *priv; + FAR const char *vqnames[VIRTIO_SERIAL_NUM]; + vq_callback callbacks[VIRTIO_SERIAL_NUM]; + char path[VIRTIO_SERIAL_PATH_SIZE]; + FAR char *name; + FAR char *argv[2]; + char arg0[32]; + int ret; + + /* Alloc the virtio serial driver and uart buffer */ + + priv = kmm_zalloc(sizeof(*priv)); + if (priv == NULL) + { + vhosterr("No enough memory\n"); + return -ENOMEM; + } + + priv->hdev = hdev; + hdev->priv = priv; + nxsem_init(&priv->semrx, 0, 0); + nxsem_init(&priv->semtx, 0, 0); + + /* Initialize actual serial port path */ + + vhost_read_config_member(priv->hdev, struct vhost_serial_config_s, Review Comment: The peer can leave `path` without a NUL, and `file_open()` and `snprintf()` then read past its end. Fix: add `path[sizeof(path) - 1] = '\0';` after `vhost_read_config_member()`, as vhost-can does. ########## drivers/vhost/vhost-serial.c: ########## @@ -0,0 +1,407 @@ +/**************************************************************************** + * drivers/vhost/vhost-serial.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <debug.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> + +#include <nuttx/lib/lib.h> +#include <nuttx/kthread.h> +#include <nuttx/spinlock.h> +#include <nuttx/vhost/vhost.h> +#include <nuttx/virtio/virtio-config.h> +#include <nuttx/virtio/virtio-serial.h> + +#include "vhost-serial.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct vhost_serial_priv_s +{ + FAR struct vhost_device *hdev; + struct file serial; + sem_t semrx; + sem_t semtx; + pid_t pidrx; + pid_t pidtx; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev); +static void vhost_serial_remove(FAR struct vhost_device *hdev); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct vhost_driver g_vhost_serial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_serial_driver.node), /* node */ + VIRTIO_ID_CONSOLE, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +static struct vhost_driver g_vhost_rprocserial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_rprocserial_driver.node), /* node */ + VIRTIO_ID_RPROC_SERIAL, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t vhost_serial_safe_write(FAR struct vhost_serial_priv_s *priv, + FAR void *buf, uint32_t len) +{ + size_t written = 0; + ssize_t ret; + + while (written < len) + { + ret = file_write(&priv->serial, buf + written, Review Comment: `buf + written` is arithmetic on `void *`, a GNU extension. Fix: make `buf` a `FAR uint8_t *` (line 87). ########## drivers/vhost/vhost-serial.c: ########## @@ -0,0 +1,407 @@ +/**************************************************************************** + * drivers/vhost/vhost-serial.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <debug.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> + +#include <nuttx/lib/lib.h> +#include <nuttx/kthread.h> +#include <nuttx/spinlock.h> +#include <nuttx/vhost/vhost.h> +#include <nuttx/virtio/virtio-config.h> +#include <nuttx/virtio/virtio-serial.h> + +#include "vhost-serial.h" + +/**************************************************************************** + * Private Types + ****************************************************************************/ + +struct vhost_serial_priv_s +{ + FAR struct vhost_device *hdev; + struct file serial; + sem_t semrx; + sem_t semtx; + pid_t pidrx; + pid_t pidtx; +}; + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev); +static void vhost_serial_remove(FAR struct vhost_device *hdev); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct vhost_driver g_vhost_serial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_serial_driver.node), /* node */ + VIRTIO_ID_CONSOLE, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +static struct vhost_driver g_vhost_rprocserial_driver = +{ + LIST_INITIAL_VALUE(g_vhost_rprocserial_driver.node), /* node */ + VIRTIO_ID_RPROC_SERIAL, /* device id */ + vhost_serial_probe, /* probe */ + vhost_serial_remove, /* remove */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t vhost_serial_safe_write(FAR struct vhost_serial_priv_s *priv, + FAR void *buf, uint32_t len) +{ + size_t written = 0; + ssize_t ret; + + while (written < len) + { + ret = file_write(&priv->serial, buf + written, + len - written); + if (ret <= 0) + { + vhosterr("File write data failed %zd\n", ret); + return ret; + } + + written += ret; + } + + return written; +} + +/**************************************************************************** + * Name: vhost_serial_tx_worker + ****************************************************************************/ + +static void vhost_serial_tx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_TX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + /* Write data to actual serial port */ + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = vhost_serial_safe_write(priv, vb[i].buf, vb[i].len); + if (ret <= 0) + { + break; + } + + len += ret; + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_tx_thread + ****************************************************************************/ + +static int vhost_serial_tx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semtx); + vhost_serial_tx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_tx_handler + ****************************************************************************/ + +static void vhost_serial_tx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semtx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semtx); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_worker + ****************************************************************************/ + +static void vhost_serial_rx_worker(FAR struct vhost_serial_priv_s *priv) +{ + FAR struct virtqueue *vq = priv->hdev->vrings_info[VIRTIO_SERIAL_RX].vq; + struct virtqueue_buf vb[2]; + bool added = false; + uint32_t len; + ssize_t idx; + ssize_t ret; + size_t vbcnt; + size_t i; + + for (; ; ) + { + idx = vhost_get_vq_buffers(vq, vb, 2, &vbcnt); + if (idx < 0) + { + break; + } + + for (i = 0, len = 0; i < vbcnt; i++) + { + ret = file_read(&priv->serial, vb[i].buf, vb[i].len); + if (ret < 0) + { + vhosterr("File read data failed %zd\n", ret); + break; + } + + len += ret; + if (ret < vb[i].len) + { + break; + } + } + + virtqueue_add_consumed_buffer(vq, idx, len); + added = true; + } + + if (added) + { + virtqueue_kick(vq); + } +} + +/**************************************************************************** + * Name: vhost_serial_rx_thread + ****************************************************************************/ + +static int vhost_serial_rx_thread(int argc, FAR char *argv[]) +{ + FAR struct vhost_serial_priv_s *priv = (FAR struct vhost_serial_priv_s *) + ((uintptr_t)strtoul(argv[1], NULL, 16)); + + for (; ; ) + { + nxsem_wait_uninterruptible(&priv->semrx); + vhost_serial_rx_worker(priv); + } + + return 0; +} + +/**************************************************************************** + * Name: vhost_serial_rx_handler + ****************************************************************************/ + +static void vhost_serial_rx_handler(FAR struct virtqueue *vq) +{ + FAR struct vhost_serial_priv_s *priv = vq->vq_dev->priv; + int semcount; + + nxsem_get_value(&priv->semrx, &semcount); + while (semcount++ < 1) + { + nxsem_post(&priv->semrx); + } +} + +/**************************************************************************** + * Name: vhost_serial_probe + ****************************************************************************/ + +static int vhost_serial_probe(FAR struct vhost_device *hdev) +{ + FAR struct vhost_serial_priv_s *priv; + FAR const char *vqnames[VIRTIO_SERIAL_NUM]; + vq_callback callbacks[VIRTIO_SERIAL_NUM]; + char path[VIRTIO_SERIAL_PATH_SIZE]; + FAR char *name; + FAR char *argv[2]; + char arg0[32]; + int ret; + + /* Alloc the virtio serial driver and uart buffer */ + + priv = kmm_zalloc(sizeof(*priv)); + if (priv == NULL) + { + vhosterr("No enough memory\n"); + return -ENOMEM; + } + + priv->hdev = hdev; + hdev->priv = priv; + nxsem_init(&priv->semrx, 0, 0); + nxsem_init(&priv->semtx, 0, 0); + + /* Initialize actual serial port path */ + + vhost_read_config_member(priv->hdev, struct vhost_serial_config_s, + path, &path); + ret = file_open(&priv->serial, path, O_RDWR | O_NOCTTY | O_SYNC); + if (ret < 0) + { + vhosterr("Open %s failed, ret=%d\n", path, ret); + goto err_file_open; + } + + /* Initialize the vhost device */ + + vqnames[VIRTIO_SERIAL_RX] = "vhost_serial_rx"; + vqnames[VIRTIO_SERIAL_TX] = "vhost_serial_tx"; + callbacks[VIRTIO_SERIAL_RX] = vhost_serial_rx_handler; + callbacks[VIRTIO_SERIAL_TX] = vhost_serial_tx_handler; + ret = vhost_create_virtqueues(hdev, 0, VIRTIO_SERIAL_NUM, vqnames, + callbacks, NULL); + if (ret < 0) + { + vhosterr("vhost_device_create_virtqueue failed, ret=%d\n", ret); + goto err_init_vq; + } + + snprintf(arg0, sizeof(arg0), "%p", priv); + argv[0] = arg0; + argv[1] = NULL; + + name = lib_get_tempbuffer(PATH_MAX); + if (name == NULL) + { + ret = -ENOMEM; + goto err_init_name; + } + + snprintf(name, PATH_MAX, "vhost_serial_rx_%s", path); + priv->pidrx = kthread_create(name, + CONFIG_DRIVERS_VHOST_SERIAL_PRIORITY, + CONFIG_DRIVERS_VHOST_SERIAL_STACKSIZE, + vhost_serial_rx_thread, argv); + if (priv->pidrx < 0) + { + vhosterr("vhost_serial_rx thread create failed %d\n", priv->pidrx); + goto err_rx_thread; + } + + snprintf(name, PATH_MAX, "vhost_serial_tx_%s", path); + priv->pidtx = kthread_create(name, + CONFIG_DRIVERS_VHOST_SERIAL_PRIORITY, + CONFIG_DRIVERS_VHOST_SERIAL_STACKSIZE, + vhost_serial_tx_thread, argv); + if (priv->pidtx < 0) + { + vhosterr("vhost_serial_tx thread create failed %d\n", priv->pidtx); + goto err_tx_thread; + } + + lib_put_tempbuffer(name); Review Comment: An RX kick before the probe has no callback, so no input ever reaches the peer. Fix: post `priv->semrx` and `priv->semtx` once before `return ret;`, as vhost-can does. ########## drivers/vhost/vhost-serial.c: ########## @@ -0,0 +1,407 @@ +/**************************************************************************** Review Comment: `vhost-serial.c` and `vhost-serial.h` have no `SPDX-License-Identifier: Apache-2.0` line. Fix: add it, as the other files in `drivers/vhost/` have. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
