dev: Add 'simLength' parameter in EthPacketData

Currently, all the network devices create a 16K buffer for the 'data' field
in EthPacketData, and use 'length' to keep track of the size of the packet
in the buffer.  This patch introduces the 'simLength' parameter to
EthPacketData, which is used to hold the effective length of the packet used
for all timing calulations in the simulator.  Serialization is performed using
only the useful data in the packet ('length') and not necessarily the entire
original buffer.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/dev/net/dist_packet.hh b/src/dev/net/dist_packet.hh
index 4c079c44a..b154ab4a7 100644
--- a/src/dev/net/dist_packet.hh
+++ b/src/dev/net/dist_packet.hh
@@ -86,6 +86,11 @@ class DistHeaderPkt
          */
         MsgType msgType;
         Tick sendTick;
+        /**
+         * Length used for modeling timing in the simulator.
+         * (from EthPacketData::simLength).
+         */
+        unsigned simLength;
         union {
             Tick sendDelay;
             Tick syncRepeat;
@@ -93,6 +98,7 @@ class DistHeaderPkt
         union {
             /**
              * Actual length of the simulated Ethernet packet.
+             * (from EthPacketData::length).
              */
             unsigned dataPacketLength;
             struct {