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diff --git a/src/ceph/src/messages/MMgrReport.h b/src/ceph/src/messages/MMgrReport.h
new file mode 100644
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+++ b/src/ceph/src/messages/MMgrReport.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2016 John Spray <john.spray@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ */
+
+
+#ifndef CEPH_MMGRREPORT_H_
+#define CEPH_MMGRREPORT_H_
+
+#include <boost/optional.hpp>
+
+#include "msg/Message.h"
+
+#include "common/perf_counters.h"
+
+class PerfCounterType
+{
+public:
+  std::string path;
+  std::string description;
+  std::string nick;
+  enum perfcounter_type_d type;
+
+  // For older clients that did not send priority, pretend everything
+  // is "useful" so that mgr plugins filtering on prio will get some
+  // data (albeit probably more than they wanted)
+  uint8_t priority = PerfCountersBuilder::PRIO_USEFUL;
+
+  void encode(bufferlist &bl) const
+  {
+    // TODO: decide whether to drop the per-type
+    // encoding here, we could rely on the MgrReport
+    // verisoning instead.
+    ENCODE_START(2, 1, bl);
+    ::encode(path, bl);
+    ::encode(description, bl);
+    ::encode(nick, bl);
+    static_assert(sizeof(type) == 1, "perfcounter_type_d must be one byte");
+    ::encode((uint8_t)type, bl);
+    ::encode(priority, bl);
+    ENCODE_FINISH(bl);
+  }
+  
+  void decode(bufferlist::iterator &p)
+  {
+    DECODE_START(2, p);
+    ::decode(path, p);
+    ::decode(description, p);
+    ::decode(nick, p);
+    ::decode((uint8_t&)type, p);
+    if (struct_v >= 2) {
+      ::decode(priority, p);
+    }
+    DECODE_FINISH(p);
+  }
+};
+WRITE_CLASS_ENCODER(PerfCounterType)
+
+class MMgrReport : public Message
+{
+  static const int HEAD_VERSION = 4;
+  static const int COMPAT_VERSION = 1;
+
+public:
+  /**
+   * Client is responsible for remembering whether it has introduced
+   * each perf counter to the server.  When first sending a particular
+   * counter, it must inline the counter's schema here.
+   */
+  std::vector<PerfCounterType> declare_types;
+  std::vector<std::string> undeclare_types;
+
+  // For all counters present, sorted by idx, output
+  // as many bytes as are needed to represent them
+
+  // Decode: iterate over the types we know about, sorted by idx,
+  // and use the current type's type to decide how to decode
+  // the next bytes from the bufferlist.
+  bufferlist packed;
+
+  std::string daemon_name;
+  std::string service_name;  // optional; otherwise infer from entity type
+
+  // for service registration
+  boost::optional<std::map<std::string,std::string>> daemon_status;
+
+  void decode_payload() override
+  {
+    bufferlist::iterator p = payload.begin();
+    ::decode(daemon_name, p);
+    ::decode(declare_types, p);
+    ::decode(packed, p);
+    if (header.version >= 2)
+      ::decode(undeclare_types, p);
+    if (header.version >= 3) {
+      ::decode(service_name, p);
+      ::decode(daemon_status, p);
+    }
+  }
+
+  void encode_payload(uint64_t features) override {
+    ::encode(daemon_name, payload);
+    ::encode(declare_types, payload);
+    ::encode(packed, payload);
+    ::encode(undeclare_types, payload);
+    ::encode(service_name, payload);
+    ::encode(daemon_status, payload);
+  }
+
+  const char *get_type_name() const override { return "mgrreport"; }
+  void print(ostream& out) const override {
+    out << get_type_name() << "(";
+    if (service_name.length()) {
+      out << service_name;
+    } else {
+      out << ceph_entity_type_name(get_source().type());
+    }
+    out << "." << daemon_name
+	<< " +" << declare_types.size()
+	<< "-" << undeclare_types.size()
+        << " packed " << packed.length();
+    if (daemon_status) {
+      out << " status=" << daemon_status->size();
+    }
+    out << ")";
+  }
+
+  MMgrReport()
+    : Message(MSG_MGR_REPORT, HEAD_VERSION, COMPAT_VERSION)
+  {}
+};
+
+#endif
+