[PATCH v2 1/3] include/public: add possible status values to usbif.h

[Juergen Gross <jgross@xxxxxxxx>]

The interface definition of PV USB devices is lacking the specification
of possible values of the status field in a response. Those are
negative errno values as used in Linux, so they might differ in other
OS's. Specify them via appropriate defines.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V2:
- add parentheses to macro values (Jan Beulich)
---
 xen/include/public/io/usbif.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/include/public/io/usbif.h b/xen/include/public/io/usbif.h
index c6a58639d6..96b9fb661d 100644
--- a/xen/include/public/io/usbif.h
+++ b/xen/include/public/io/usbif.h
@@ -221,6 +221,13 @@ struct usbif_urb_response {
        uint16_t id; /* request id */
        uint16_t start_frame;  /* start frame (ISO) */
        int32_t status; /* status (non-ISO) */
+#define USBIF_STATUS_OK                0
+#define USBIF_STATUS_NODEV     (-19)
+#define USBIF_STATUS_INVAL     (-22)
+#define USBIF_STATUS_STALL     (-32)
+#define USBIF_STATUS_IOERROR   (-71)
+#define USBIF_STATUS_BABBLE    (-75)
+#define USBIF_STATUS_SHUTDOWN  (-108)
        int32_t actual_length; /* actual transfer length */
        int32_t error_count; /* number of ISO errors */
 };
-- 
2.26.2