1 files changed, 109 insertions, 0 deletions
diff --git a/src/messages/MMonPing.h b/src/messages/MMonPing.h
new file mode 100644
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--- /dev/null
+++ b/src/messages/MMonPing.h
@@ -0,0 +1,109 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/**
+ * This is used to send pings between monitors for
+ * heartbeat purposes. We include a timestamp and distinguish between
+ * outgoing pings and responses to those. If you set the
+ * min_message in the constructor, the message will inflate itself
+ * to the specified size -- this is good for dealing with network
+ * issues with jumbo frames. See http://tracker.ceph.com/issues/20087
+ *
+ */
+
+#ifndef CEPH_MMONPING_H
+#define CEPH_MMONPING_H
+
+#include "common/Clock.h"
+
+#include "msg/Message.h"
+#include "mon/ConnectionTracker.h"
+
+class MMonPing final : public Message {
+private:
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+ public:
+  enum {
+    PING = 1,
+    PING_REPLY = 2,
+  };
+  const char *get_op_name(int op) const {
+    switch (op) {
+    case PING: return "ping";
+    case PING_REPLY: return "ping_reply";
+    default: return "???";
+    }
+  }
+
+  __u8 op = 0;
+  utime_t stamp;
+  bufferlist tracker_bl;
+  uint32_t min_message_size = 0;
+
+  MMonPing(__u8 o, utime_t s, const bufferlist& tbl,
+	   uint32_t min_message)
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION},
+      op(o), stamp(s), tracker_bl(tbl), min_message_size(min_message)
+  {}
+  MMonPing(__u8 o, utime_t s, const bufferlist& tbl)
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION},
+      op(o), stamp(s), tracker_bl(tbl) {}
+  MMonPing()
+    : Message{MSG_MON_PING, HEAD_VERSION, COMPAT_VERSION}
+  {}
+private:
+  ~MMonPing() final {}
+
+public:
+  void decode_payload() override {
+    auto p = payload.cbegin();
+    decode(op, p);
+    decode(stamp, p);
+    decode(tracker_bl, p);
+
+    int payload_mid_length = p.get_off();
+    uint32_t size;
+    decode(size, p);
+    p += size;
+    min_message_size = size + payload_mid_length;
+  }
+  void encode_payload(uint64_t features) override {
+    using ceph::encode;
+    encode(op, payload);
+    encode(stamp, payload);
+    encode(tracker_bl, payload);
+
+    size_t s = 0;
+    if (min_message_size > payload.length()) {
+      s = min_message_size - payload.length();
+    }
+    encode((uint32_t)s, payload);
+    if (s) {
+      // this should be big enough for normal min_message padding sizes. since
+      // we are targeting jumbo ethernet frames around 9000 bytes, 16k should
+      // be more than sufficient!  the compiler will statically zero this so
+      // that at runtime we are only adding a bufferptr reference to it.
+      static char zeros[16384] = {};
+      while (s > sizeof(zeros)) {
+        payload.append(buffer::create_static(sizeof(zeros), zeros));
+        s -= sizeof(zeros);
+      }
+      if (s) {
+        payload.append(buffer::create_static(s, zeros));
+      }
+    }
+  }
+
+  std::string_view get_type_name() const override { return "mon_ping"; }
+  void print(ostream& out) const override {
+    out << "mon_ping(" << get_op_name(op)
+	<< " stamp " << stamp
+	<< ")";
+  }
+private:
+  template<class T, typename... Args>
+  friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif