net: add trace_vhost_user_event

Replace error_report() and use tracing instead. It's not an error to get
a connection or a disconnection, so silence this and trace it instead.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Tested-by: NThibaut Collet <thibaut.collet@6wind.com>

net/vhost-user.c

@@ -15,6 +15,7 @@
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
 #include "qmp-commands.h"
+#include "trace.h"
 
 typedef struct VhostUserState {
     NetClientState nc;
@@ -148,18 +149,17 @@ static void net_vhost_user_event(void *opaque, int event)
                                           NET_CLIENT_OPTIONS_KIND_NIC,
                                           MAX_QUEUE_NUM);
     s = DO_UPCAST(VhostUserState, nc, ncs[0]);
+    trace_vhost_user_event(s->chr->label, event);
     switch (event) {
     case CHR_EVENT_OPENED:
         if (vhost_user_start(queues, ncs) < 0) {
             exit(1);
         }
         qmp_set_link(name, true, &err);
-        error_report("chardev \"%s\" went up", s->chr->label);
         break;
     case CHR_EVENT_CLOSED:
         qmp_set_link(name, true, &err);
         vhost_user_stop(queues, ncs);
-        error_report("chardev \"%s\" went down", s->chr->label);
         break;
     }
 

trace-events

@@ -1705,3 +1705,6 @@ qcrypto_tls_creds_x509_load_cert_list(void *creds, const char *file) "TLS creds
 
 # crypto/tlssession.c
 qcrypto_tls_session_new(void *session, void *creds, const char *hostname, const char *aclname, int endpoint) "TLS session new session=%p creds=%p hostname=%s aclname=%s endpoint=%d"
+
+# net/vhost-user.c
+vhost_user_event(const char *chr, int event) "chr: %s got event: %d"