Add virtio-loopback-adapter

The virtio-loopback-adapter is part of the Virtio Loopback
architecture detailed in the following link:
  https://git.virtualopensystems.com/virtio-loopback/docs

The following vhost-user devices are supported:
- vhost-user-blk
- vhost-user-rng
- vhost-user-input
- vhost-user-gpio
- vhost-user-sound

Bug-AGL: SPEC-4834
Change-Id: I4edb28faf370992f5f45390f5c4240a0f5c3084c
Signed-off-by: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/vhost_loopback.h b/vhost_loopback.h
new file mode 100644
index 0000000..198a5af
--- /dev/null
+++ b/vhost_loopback.h
@@ -0,0 +1,80 @@
+/*
+ * Based on vhost.h of QEMU project
+ *
+ * Copyright 2022-2023 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef LOOPBACK_VHOST_H
+#define LOOPBACK_VHOST_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <poll.h>
+#include <pthread.h>
+#include "vhost_user_loopback.h"
+#include "virtio_loopback.h"
+
+#define VHOST_INVALID_FEATURE_BIT (0xff)
+#define VHOST_QUEUE_NUM_CONFIG_INR 0
+
+int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
+int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings);
+void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev,
+                          int n, bool mask);
+int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config,
+                         uint32_t config_len);
+int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data,
+                         uint32_t offset, uint32_t size, uint32_t flags);
+uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
+                            uint64_t features);
+void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
+                        uint64_t features);
+
+/**
+ * vhost_dev_set_config_notifier() - register VhostDevConfigOps
+ * @hdev: common vhost_dev_structure
+ * @ops: notifier ops
+ *
+ * If the device is expected to change configuration a notifier can be
+ * setup to handle the case.
+ */
+
+typedef struct VhostDevConfigOps VhostDevConfigOps;
+
+void vhost_dev_set_config_notifier(struct vhost_dev *dev,
+                                   const VhostDevConfigOps *ops);
+int vhost_dev_prepare_inflight(struct vhost_dev *hdev, VirtIODevice *vdev);
+
+int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
+                           struct vhost_inflight *inflight);
+
+int vhost_dev_set_inflight(struct vhost_dev *dev,
+                           struct vhost_inflight *inflight);
+
+void update_mem_table(VirtIODevice *vdev);
+
+
+struct vhost_inflight {
+    int fd;
+    void *addr;
+    uint64_t size;
+    uint64_t offset;
+    uint16_t queue_size;
+};
+
+#endif /* LOOPBACK_VHOST_H */