added superpage link id

Author: sy-c

doc/releaseNotes.md

@@ -15,3 +15,4 @@ This file describes the main feature changes for released versions of ReadoutCar
 
 ## next
 - log messages level updated: moved all Ops messages to Devel. The calling layer is in charge to reporting high level operation messages.
+- superpage metadata: added link id.

include/ReadoutCard/Superpage.h

@@ -103,12 +103,23 @@ struct Superpage {
     mUserData = userData;
   }
 
+  /// Set the link id
+  void setLink(int id = -1) {
+    mLink = id;
+  }
+
+  /// Get the link id
+  int getLink() {
+    return mLink;
+  }
+
  private:
   size_t mOffset = 0;        ///< Offset from the start of the DMA buffer to the start of the superpage
   size_t mSize = 0;          ///< Size of the superpage in bytes
   void* mUserData = nullptr; ///< Pointer that users can use for whatever, e.g. to associate data with the superpage
   size_t mReceived = 0;      ///< Size of the received data in bytes
   bool mReady = false;       ///< Indicates this superpage is ready
+  int mLink = -1;            ///< The link producing the data
 };
 
 } // namespace roc

src/Cru/CruDmaChannel.cxx

@@ -327,6 +327,7 @@ void CruDmaChannel::transferSuperpageFromLinkToReady(Link& link, bool reclaim)
     link.queue->frontPtr()->setReceived(0);
   }
 
+  link.queue->frontPtr()->setLink(link.id);
   mReadyQueue->write(*link.queue->frontPtr());
   link.queue->popFront();
   link.superpageCounter++;