Add multiple-device support virtio-loopback-adapter

Updates [v1]:
- The adapter supports multiple vhost-user devices running in
  parallel.
- Redesign the devices interfaces. Unified their common functionality
  and add it into vhost-user-loopback lib. This eases the addition of
  new vhost-user devices and makes the virtio-loopback adapter more
  device agnostic.

Bug-AGL: SPEC-4834
Change-Id: I9aff91dce0207ccdd8c2d1c5d0769a13b4e9ae04
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>

1 files changed, 0 insertions, 329 deletions

diff --git a/vhost_user_can.c b/vhost_user_can.c
deleted file mode 100644
index c645948..0000000
--- a/vhost_user_can.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * Virtio CAN Device
- *
- * Based on virtio_can.h of OpenSynergy's virtio-can RFC
- * https://github.com/OpenSynergy/qemu/tree/virtio-can-spec-rfc-v3
- *
- * Copyright (C) 2021-2023 OpenSynergy GmbH
- * Copyright (c) 2023 Virtual Open Systems SAS.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the
- * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdint.h>
-#include <string.h>
-#include <stdbool.h>
-#include <sys/param.h>
-
-/* Project header files */
-#include "vhost_user_can.h"
-
-#ifdef DEBUG
-#define DBG(...) printf("vhost-user-can: " __VA_ARGS__)
-#else
-#define DBG(...)
-#endif /* DEBUG */
-
-/***************************** vhost-user-can ******************************/
-
-static const int user_feature_bits[] = {
-    VIRTIO_F_VERSION_1,
-    VIRTIO_RING_F_INDIRECT_DESC,
-    VIRTIO_RING_F_EVENT_IDX,
-    VIRTIO_F_RING_RESET,
-    VIRTIO_F_NOTIFY_ON_EMPTY,
-    VHOST_INVALID_FEATURE_BIT
-};
-
-static void vhost_user_can_get_config(VirtIODevice *vdev, uint8_t *config)
-{
-    VHostUserCan *can = vdev->vhucan;
-
-    DBG("vhost_user_can_get_config: Not yet implemented!\n");
-
-    /*
-     * TODO : Add this check depend on 'busoff' value
-     * if (vcan->busoff) {
-     *     config->status = cpu_to_le32(VIRTIO_CAN_S_CTRL_BUSOFF);
-     * } else {
-     *     config->status = cpu_to_le32(0);
-     * }
-     */
-
-    memcpy(config, &can->config, sizeof(struct virtio_can_config));
-}
-
-
-static void vhost_user_can_start(VirtIODevice *vdev)
-{
-    VHostUserCan *vhucan = vdev->vhucan;
-    VirtioBus *k = vdev->vbus;
-    int ret;
-    unsigned int i;
-
-    DBG("vhost_user_can_start(...)\n");
-
-    if (!k->set_guest_notifiers) {
-        DBG("binding does not support guest notifiers\n");
-        return;
-    }
-
-    ret = vhost_dev_enable_notifiers(vhucan->vhost_dev, vdev);
-    if (ret < 0) {
-        DBG("Error enabling host notifiers: %d\n", -ret);
-        return;
-    }
-
-    ret = k->set_guest_notifiers(k->vdev, vhucan->vhost_dev->nvqs, true);
-    if (ret < 0) {
-        DBG("Error binding guest notifier: %d\n", -ret);
-        goto err_host_notifiers;
-    }
-
-    vhucan->vhost_dev->acked_features = vdev->guest_features;
-
-    ret = vhost_dev_start(vhucan->vhost_dev, vdev, true);
-    if (ret < 0) {
-        DBG("Error starting vhost: %d\n", -ret);
-        goto err_guest_notifiers;
-    }
-
-    /*
-     * guest_notifier_mask/pending not used yet, so just unmask
-     * everything here.  virtio-pci will do the right thing by
-     * enabling/disabling irqfd.
-     */
-    for (i = 0; i < vhucan->vhost_dev->nvqs; i++) {
-        vhost_virtqueue_mask(vhucan->vhost_dev, vdev, i, false);
-    }
-
-    return;
-
-err_guest_notifiers:
-err_host_notifiers:
-    DBG("vhu_start error\n");
-    return;
-}
-
-static void vhost_user_can_stop(VirtIODevice *vdev)
-{
-    DBG("vhost_user_can_stop: not yet implemented\n");
-    (void)vdev;
-}
-
-static void vhost_user_can_set_status(VirtIODevice *vdev, uint8_t status)
-{
-    VHostUserCan *vhucan = vdev->vhucan;
-    bool should_start = virtio_device_started(vdev, status);
-    DBG("vhost_user_can_set_status: %d\n", status);
-
-    if (vhucan->vhost_dev->started == should_start) {
-        DBG("can->vhost_dev->started == should_start\n");
-        return;
-    }
-
-    if (should_start) {
-        vhost_user_can_start(vdev);
-    } else {
-        vhost_user_can_stop(vdev);
-    }
-}
-
-static uint64_t vhost_user_can_get_features(VirtIODevice *vdev,
-                                            uint64_t features)
-{
-    VHostUserCan *s = vdev->vhucan;
-
-    DBG("vhost_user_can_get_features()\n");
-
-    return vhost_get_features(s->vhost_dev, user_feature_bits, features);
-}
-
-static void vhost_user_can_can_handle_output(VirtIODevice *vdev, VirtQueue *vq)
-{
-    /*
-     * Not normally called; it's the daemon that handles the queue;
-     * however virtio's cleanup path can call this.
-     */
-    DBG("vhost_user_can_can_handle_output: Not yet implemented!\n");
-    (void)vdev;
-    (void)vq;
-}
-
-/*
- * TODO: Add it later
- * static void vhost_sound_guest_notifier_mask(VirtIODevice *vdev, int idx,
- *                                             bool mask)
- */
-
-/*
- * TODO: Add it later
- * static bool vhost_sound_guest_notifier_pending(VirtIODevice *vdev,
- *                                                int idx)
- */
-
-static int vhost_user_can_can_config_change(struct vhost_dev *dev)
-{
-    VHostUserCan *vhucan = dev->vdev->vhucan;
-    DBG("vhost_user_can_can_config_change: Not yet implemented!\n");
-
-    int ret = vhost_dev_get_config(dev, (uint8_t *)&vhucan->config,
-                                   sizeof(struct virtio_can_config));
-    if (ret < 0) {
-        DBG("vhost_user_can_sound_config_change error\n");
-        return -1;
-    }
-
-    virtio_notify_config(dev->vdev);
-
-    return 0;
-}
-
-const VhostDevConfigOps can_config_ops = {
-    .vhost_dev_config_notifier = vhost_user_can_can_config_change,
-};
-
-static void vhost_user_can_init(VirtIODevice *vdev);
-
-void vhost_user_can_realize(int queue_num, int queue_size)
-{
-    VirtIODevice *vdev = global_vdev;
-    int ret;
-
-    DBG("vhost_user_can_device_realize\n");
-    (void)queue_num;
-    (void)queue_size;
-
-    /* This needs to be added */
-    proxy = (VirtIOMMIOProxy *)malloc(sizeof(VirtIOMMIOProxy));
-    *proxy = (VirtIOMMIOProxy) {
-        .legacy = 1,
-    };
-
-    /* VIRTIO_ID_CAN is 36, check virtio_ids.h in linux*/
-    virtio_dev_init(vdev, "virtio-can", 36, sizeof(vdev->vhucan->config));
-    vhost_user_can_init(global_vdev);
-
-    /* add queues */
-    vdev->vhucan->ctrl_vq = virtio_add_queue(vdev, 64,
-                                             vhost_user_can_can_handle_output);
-    vdev->vhucan->tx_vq = virtio_add_queue(vdev, 64,
-                                           vhost_user_can_can_handle_output);
-    vdev->vhucan->rx_vq = virtio_add_queue(vdev, 64,
-                                           vhost_user_can_can_handle_output);
-    vdev->vhucan->vhost_dev->nvqs = 3;
-    vdev->vhucan->num_queues = 3;
-    vdev->vhucan->queue_size = 64;
-
-    /* NOTE: global_vdev->vqs == vhucan->virtqs */
-    vdev->vqs = (VirtQueue **)malloc(sizeof(VirtQueue *)
-                                     * global_vdev->vhucan->num_queues);
-    vdev->vqs[0] = vdev->vhucan->tx_vq;
-    vdev->vqs[1] = vdev->vhucan->rx_vq;
-    vdev->vqs[2] = vdev->vhucan->ctrl_vq;
-
-    vdev->vhucan->vhost_vqs = (struct vhost_virtqueue *)malloc(
-                                       sizeof(struct vhost_virtqueue) *
-                                       vdev->vhucan->num_queues);
-
-    /* Set up vhost device */
-    vdev->vhucan->vhost_dev->num_queues = vdev->vhucan->num_queues;
-    vdev->vhucan->vhost_dev->nvqs = vdev->vhucan->num_queues;
-    vdev->vhucan->vhost_dev->vqs = vdev->vhucan->vhost_vqs;
-    vdev->vhucan->vhost_dev->vq_index = 0;
-    vdev->vhucan->vhost_dev->backend_features = 0;
-
-    vhost_dev_set_config_notifier(vdev->vhucan->vhost_dev, &can_config_ops);
-
-    /* TODO: Add error handling */
-    vhost_dev_init(vdev->vhucan->vhost_dev);
-
-    /* Pass the new obtained features */
-    global_vdev->host_features = vdev->vhucan->vhost_dev->features;
-
-    ret = vhost_dev_get_config(vdev->vhucan->vhost_dev,
-                               (uint8_t *)&vdev->vhucan->config,
-                               sizeof(struct virtio_can_config));
-    if (ret < 0) {
-        goto vhost_dev_init_failed;
-    }
-
-    vdev->vdev_class->print_config((uint8_t *)&vdev->vhucan->config);
-
-    return;
-
-vhost_dev_init_failed:
-    DBG("vhost_dev_init_failed\n");
-    return;
-}
-
-static void vhost_user_can_device_unrealize(VirtIODevice *vdev)
-{
-    DBG("vhost_user_blk_device_unrealize not yet implemented\n");
-    (void)vdev;
-}
-
-/* This funciton might be useful in the future
- *
- * static struct vhost_dev *vhost_user_can_get_vhost(VirtIODevice *vdev)
- * {
- *     VHostUserCan *vhucan = vdev->vhucan;
- *     return vhucan->vhost_dev;
- * }
- *
- */
-
-static void print_config_can(uint8_t *config_data)
-{
-    struct virtio_can_config *config_strct =
-        (struct virtio_can_config *)config_data;
-
-    (void)config_strct;
-    DBG("print_config_can:\n");
-
-    DBG("\tuint16_t status: %u\n", config_strct->status);
-}
-
-static void virtio_dev_class_init(VirtIODevice *vdev)
-{
-    DBG("virtio_dev_class_init\n");
-
-    vdev->vdev_class = (VirtioDeviceClass *)malloc(sizeof(VirtioDeviceClass));
-    vdev->vdev_class->parent = vdev;
-    vdev->vdev_class->realize = vhost_user_can_realize;
-    vdev->vdev_class->unrealize = vhost_user_can_device_unrealize;
-    vdev->vdev_class->get_config = vhost_user_can_get_config;
-    vdev->vdev_class->get_features = vhost_user_can_get_features;
-    vdev->vdev_class->set_status = vhost_user_can_set_status;
-    vdev->vdev_class->update_mem_table = update_mem_table;
-    vdev->vdev_class->print_config = print_config_can;
-}
-
-static void vhost_user_can_init(VirtIODevice *vdev)
-{
-    DBG("vhost_user_can_init\n");
-
-    VHostUserCan *vhucan = (VHostUserCan *)malloc(sizeof(VHostUserCan));
-    vdev->vhucan = vhucan;
-    vdev->nvqs = (int *)&vdev->vhdev->nvqs;
-    vhucan->parent = vdev;
-    vhucan->virtqs = vdev->vqs;
-    vhucan->vhost_dev = vdev->vhdev;
-
-    virtio_dev_class_init(vdev);
-    virtio_loopback_bus_init(vdev->vbus);
-}