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, 59 insertions, 0 deletions

diff --git a/include/vhost_user_blk.h b/include/vhost_user_blk.h
new file mode 100644
index 0000000..3b25dfe
--- /dev/null
+++ b/include/vhost_user_blk.h
@@ -0,0 +1,59 @@
+/*
+ * Based on vhost-user-blk.h of QEMU project
+ *
+ *   Copyright(C) 2017 Intel Corporation.
+ *
+ *   Authors:
+ *    Changpeng Liu <changpeng.liu@intel.com>
+ *
+ *
+ * Copyright (c) 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 VHOST_USER_BLK
+#define VHOST_USER_BLK
+
+#include "vhost_loopback.h"
+#include "vhost_user_loopback.h"
+#include "virtio_loopback.h"
+#include <linux/virtio_blk.h>
+
+#define TYPE_VHOST_USER_BLK "vhost-user-blk"
+
+#define VHOST_USER_BLK_AUTO_NUM_QUEUES UINT16_MAX
+
+struct VHostUserBlk {
+    VirtIODevice *parent;
+    struct vhost_virtqueue *vhost_vq;
+    struct vhost_dev *vhost_dev;
+    VirtQueue *req_vq;
+    VirtQueue **virtqs;
+    uint16_t num_queues;
+    uint32_t queue_size;
+    /* uint32_t config_wce; //We will need it for the next release */
+    uint32_t config_wce;
+    struct vhost_inflight *inflight;
+    struct vhost_virtqueue *vhost_vqs;
+    struct virtio_blk_config blkcfg;
+    bool connected;
+    bool started_vu;
+};
+
+void vhost_user_blk_realize(struct adapter_dev *adev);
+
+#endif /* VHOST_USER_BLK */