Changeset 11637:cd6bb67002fa

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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.