libvhost-user: expose vu_request_to_string

This is useful for more human readable debug messages in vhost-user
programs.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220321153037.3622127-9-alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

subprojects/libvhost-user/libvhost-user.c

@@ -99,7 +99,7 @@ static inline bool vu_has_protocol_feature(VuDev *dev, unsigned int fbit)
     return has_feature(dev->protocol_features, fbit);
 }
 
-static const char *
+const char *
 vu_request_to_string(unsigned int req)
 {
 #define REQ(req) [req] = #req

subprojects/libvhost-user/libvhost-user.h

@@ -473,6 +473,15 @@ bool vu_init(VuDev *dev,
  */
 void vu_deinit(VuDev *dev);
 
+
+/**
+ * vu_request_to_string: return string for vhost message request
+ * @req: VhostUserMsg request
+ *
+ * Returns a const string, do not free.
+ */
+const char *vu_request_to_string(unsigned int req);
+
 /**
  * vu_dispatch:
  * @dev: a VuDev context