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, 54 insertions, 0 deletions

diff --git a/include/vhost_user_can.h b/include/vhost_user_can.h
new file mode 100644
index 0000000..4768499
--- /dev/null
+++ b/include/vhost_user_can.h
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+
+#ifndef VHOST_USER_CAN
+#define VHOST_USER_CAN
+
+#include "virtio_loopback.h"
+#include "vhost_loopback.h"
+#include "vhost_user_loopback.h"
+
+/* The following are defined into virtio_can.h -- Delete them in the future */
+#define VIRTIO_CAN_S_CTRL_BUSOFF (1u << 0) /* Controller BusOff */
+struct virtio_can_config {
+    /* CAN controller status */
+    __le16 status;
+};
+
+typedef struct VHostUserCan {
+    VirtIODevice *parent;
+    struct vhost_virtqueue *vhost_vqs;
+    VirtQueue **virtqs;
+    uint16_t num_queues;
+    uint32_t queue_size;
+    struct virtio_can_config config;
+    struct vhost_dev *vhost_dev;
+    /* Support classic CAN */
+    bool support_can_classic;
+    /* Support CAN FD */
+    bool support_can_fd;
+} VHostUserCan;
+
+void vhost_user_can_realize(struct adapter_dev *adev);
+
+#endif /* VHOST_USER_CAN */