Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 54 insertions, 0 deletions

diff --git a/hw/usb/quirks.c b/hw/usb/quirks.c
new file mode 100644
index 000000000..23ea7a23e
--- /dev/null
+++ b/hw/usb/quirks.c
@@ -0,0 +1,54 @@
+/*
+ * USB quirk handling
+ *
+ * Copyright (c) 2012 Red Hat, Inc.
+ *
+ * Red Hat Authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ *
+ * 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.
+ */
+
+#include "qemu/osdep.h"
+#include "quirks.h"
+#include "hw/usb.h"
+
+static bool usb_id_match(const struct usb_device_id *ids,
+                         uint16_t vendor_id, uint16_t product_id,
+                         uint8_t interface_class, uint8_t interface_subclass,
+                         uint8_t interface_protocol) {
+    int i;
+
+    for (i = 0; ids[i].terminating_entry == 0; i++) {
+        if (ids[i].vendor_id  == vendor_id &&
+            ids[i].product_id == product_id &&
+            (ids[i].interface_protocol_used == 0 ||
+             (ids[i].interface_class == interface_class &&
+              ids[i].interface_subclass == interface_subclass &&
+              ids[i].interface_protocol == interface_protocol))) {
+            return true;
+        }
+    }
+    return false;
+}
+
+int usb_get_quirks(uint16_t vendor_id, uint16_t product_id,
+                   uint8_t interface_class, uint8_t interface_subclass,
+                   uint8_t interface_protocol)
+{
+    int quirks = 0;
+
+    if (usb_id_match(usbredir_raw_serial_ids, vendor_id, product_id,
+                   interface_class, interface_subclass, interface_protocol)) {
+        quirks |= USB_QUIRK_BUFFER_BULK_IN;
+    }
+    if (usb_id_match(usbredir_ftdi_serial_ids, vendor_id, product_id,
+                   interface_class, interface_subclass, interface_protocol)) {
+        quirks |= USB_QUIRK_BUFFER_BULK_IN | USB_QUIRK_IS_FTDI;
+    }
+
+    return quirks;
+}