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, 322 deletions

diff --git a/vhost_user_sound.c b/vhost_user_sound.c
deleted file mode 100644
index d9f6a98..0000000
--- a/vhost_user_sound.c
+++ /dev/null
@@ -1,322 +0,0 @@
-/*
- * Based on vhost-user-sound.c of QEMU project
- *
- * Copyright 2020 Red Hat, Inc.
- *
- * Copyright (c) 2023 Virtual Open Systems SAS.
- *
- * This work is licensed under the terms of the GNU GPL, version 2 or
- * (at your option) any later version.  See the COPYING file in the
- * top-level directory.
- *
- */
-
-
-#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_sound.h"
-
-#ifdef DEBUG
-#define DBG(...) printf("vhost-user-sound: " __VA_ARGS__)
-#else
-#define DBG(...)
-#endif /* DEBUG */
-
-/***************************** vhost-user-sound ******************************/
-
-/*
- * Features supported by the vhost-user-sound frontend:
- *     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 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 vus_get_config(VirtIODevice *vdev, uint8_t *config)
-{
-    VHostUserSound *snd = vdev->vhusnd;
-
-    memcpy(config, &snd->config, sizeof(struct virtio_snd_config));
-}
-
-
-static void vus_start(VirtIODevice *vdev)
-{
-    VHostUserSound *vhusnd = vdev->vhusnd;
-    VirtioBus *k = vdev->vbus;
-    int ret;
-    unsigned int i;
-
-    DBG("vus_start(...)\n");
-
-    if (!k->set_guest_notifiers) {
-        DBG("binding does not support guest notifiers\n");
-        return;
-    }
-
-    ret = vhost_dev_enable_notifiers(vhusnd->vhost_dev, vdev);
-    if (ret < 0) {
-        DBG("Error enabling host notifiers: %d\n", -ret);
-        return;
-    }
-
-    ret = k->set_guest_notifiers(k->vdev, vhusnd->vhost_dev->nvqs, true);
-    if (ret < 0) {
-        DBG("Error binding guest notifier: %d\n", -ret);
-        goto err_host_notifiers;
-    }
-
-    vhusnd->vhost_dev->acked_features = vdev->guest_features;
-
-    ret = vhost_dev_start(vhusnd->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 < vhusnd->vhost_dev->nvqs; i++) {
-        vhost_virtqueue_mask(vhusnd->vhost_dev, vdev, i, false);
-    }
-
-    return;
-
-err_guest_notifiers:
-err_host_notifiers:
-    DBG("vhu_start error\n");
-    return;
-}
-
-static void vus_stop(VirtIODevice *vdev)
-{
-    DBG("vus_stop: not yet implemented\n");
-    (void)vdev;
-}
-
-static void vus_set_status(VirtIODevice *vdev, uint8_t status)
-{
-    VHostUserSound *vhusnd = vdev->vhusnd;
-    bool should_start = virtio_device_started(vdev, status);
-    DBG("vus_set_status\n");
-
-    if (vhusnd->vhost_dev->started == should_start) {
-        DBG("snd->vhost_dev->started == should_start\n");
-        return;
-    }
-
-    if (should_start) {
-        vus_start(vdev);
-    } else {
-        vus_stop(vdev);
-    }
-}
-
-static uint64_t vus_get_features(VirtIODevice *vdev, uint64_t features)
-{
-    VHostUserSound *s = vdev->vhusnd;
-
-    DBG("vus_get_features()\n");
-
-    return vhost_get_features(s->vhost_dev, user_feature_bits, features);
-}
-
-static void vus_snd_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.
-     */
-    (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 vus_sound_config_change(struct vhost_dev *dev)
-{
-    VHostUserSound *vhusnd = dev->vdev->vhusnd;
-    DBG("vus_sound_config_change\n");
-
-    int ret = vhost_dev_get_config(dev, (uint8_t *)&vhusnd->config,
-                                   sizeof(struct virtio_snd_config));
-    if (ret < 0) {
-        DBG("vus_sound_config_change error\n");
-        return -1;
-    }
-
-    virtio_notify_config(dev->vdev);
-
-    return 0;
-}
-
-const VhostDevConfigOps snd_config_ops = {
-    .vhost_dev_config_notifier = vus_sound_config_change,
-};
-
-static void vhost_user_snd_init(VirtIODevice *vdev);
-
-void vus_device_realize(int queue_num, int queue_size)
-{
-    VirtIODevice *vdev = global_vdev;
-    int ret;
-
-    DBG("vus_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_SOUND is 25, check virtio_ids.h in linux*/
-    virtio_dev_init(vdev, "virtio-sound", 25, sizeof(vdev->vhusnd->config));
-    vhost_user_snd_init(global_vdev);
-
-    /* add queues */
-    vdev->vhusnd->ctrl_vq = virtio_add_queue(vdev, 64, vus_snd_handle_output);
-    vdev->vhusnd->event_vq = virtio_add_queue(vdev, 64, vus_snd_handle_output);
-    vdev->vhusnd->tx_vq = virtio_add_queue(vdev, 64, vus_snd_handle_output);
-    vdev->vhusnd->rx_vq = virtio_add_queue(vdev, 64, vus_snd_handle_output);
-    vdev->vhusnd->vhost_dev->nvqs = 4;
-    vdev->vhusnd->num_queues = 4;
-    vdev->vhusnd->queue_size = 64;
-
-    /* NOTE: global_vdev->vqs == vhublk->virtqs */
-    vdev->vqs = (VirtQueue **)malloc(sizeof(VirtQueue *)
-                                     * global_vdev->vhusnd->num_queues);
-    vdev->vqs[0] = vdev->vhusnd->ctrl_vq;
-    vdev->vqs[1] = vdev->vhusnd->event_vq;
-    vdev->vqs[2] = vdev->vhusnd->tx_vq;
-    vdev->vqs[3] = vdev->vhusnd->rx_vq;
-
-    vdev->vhusnd->vhost_vqs = (struct vhost_virtqueue *)malloc(
-                                       sizeof(struct vhost_virtqueue) *
-                                       vdev->vhusnd->num_queues);
-
-    /* Set up vhost device */
-    vdev->vhusnd->vhost_dev->num_queues = vdev->vhusnd->num_queues;
-    vdev->vhusnd->vhost_dev->nvqs = vdev->vhusnd->num_queues;
-    vdev->vhusnd->vhost_dev->vqs = vdev->vhusnd->vhost_vqs;
-    vdev->vhusnd->vhost_dev->vq_index = 0;
-    vdev->vhusnd->vhost_dev->backend_features = 0;
-
-    vhost_dev_set_config_notifier(vdev->vhusnd->vhost_dev, &snd_config_ops);
-
-    /* TODO: Add error handling */
-    vhost_dev_init(vdev->vhusnd->vhost_dev);
-
-    /* Pass the new obtained features */
-    global_vdev->host_features = vdev->vhusnd->vhost_dev->features;
-
-    ret = vhost_dev_get_config(vdev->vhusnd->vhost_dev,
-                               (uint8_t *)&vdev->vhusnd->config,
-                               sizeof(struct virtio_snd_config));
-    if (ret < 0) {
-        goto vhost_dev_init_failed;
-    }
-
-    vdev->vdev_class->print_config((uint8_t *)&vdev->vhusnd->config);
-
-    return;
-
-vhost_dev_init_failed:
-    DBG("vhost_dev_init_failed\n");
-    return;
-}
-
-static void vus_device_unrealize(VirtIODevice *vdev)
-{
-    DBG("vhost_user_blk_device_unrealize not yet implemented\n");
-    (void)vdev;
-}
-
-/*
- * This will be might be useful in the future
- *
- * static struct vhost_dev *vus_get_vhost(VirtIODevice *vdev)
- * {
- *     VHostUserSound *vhusnd = vdev->vhusnd;
- *     return vhusnd->vhost_dev;
- * }
- *
- */
-
-static void print_config_snd(uint8_t *config_data)
-{
-    struct virtio_snd_config *config_strct =
-        (struct virtio_snd_config *)config_data;
-
-    (void)config_strct;
-
-    DBG("print_config_snd:\n");
-    /* # of available physical jacks */
-    DBG("\tuint32_t jacks: %u\n", config_strct->jacks);
-    /* # of available PCM streams */
-    DBG("\tuint32_t streams: %u\n", config_strct->streams);
-    /* # of available channel maps */
-    DBG("\tuint32_t chmaps: %u\n", config_strct->chmaps);
-}
-
-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 = vus_device_realize;
-    vdev->vdev_class->unrealize = vus_device_unrealize;
-    vdev->vdev_class->get_config = vus_get_config;
-    vdev->vdev_class->get_features = vus_get_features;
-    vdev->vdev_class->set_status = vus_set_status;
-    vdev->vdev_class->update_mem_table = update_mem_table;
-    vdev->vdev_class->print_config = print_config_snd;
-}
-
-static void vhost_user_snd_init(VirtIODevice *vdev)
-{
-
-    DBG("vhost_user_blk_init\n");
-
-    VHostUserSound *vhusnd = (VHostUserSound *)malloc(sizeof(VHostUserSound));
-    vdev->vhusnd = vhusnd;
-    vdev->nvqs = (int *)&vdev->vhdev->nvqs;
-    vhusnd->parent = vdev;
-    vhusnd->virtqs = vdev->vqs;
-    vhusnd->vhost_dev = vdev->vhdev;
-
-    virtio_dev_class_init(vdev);
-    virtio_loopback_bus_init(vdev->vbus);
-}