Change-Id: I2d673f6b4925e97efd79f3e383607068914cf78e

Documentation in src/networks/model-net/doc/README.fattree.txt

This commit is joint work by Jens Domke and Nikhil Jain.

Jens did all the ground work for dumping the topology and reading the routing
tables. He also wrote the scripts that perform the intermediate steps that
generate the routing tables using the topology.

Nikhil integrated Jens's changes into CODES by breaking them into a 3 step
process as described in src/networks/model-net/doc/README.fattree.txt.

Change-Id: I1478fb2ab83b9ded0673d8f897e09a423868795a

- Update routing algorithm to take into account new custom- mapping
between L1 and L2 switches
- Added total finished packets to stats collection file
- Updates to layout connections output for visualization

 - Verified to construct 3-level fat trees correctly using custom-
approach.
 - Verified to work with 2, 3 and 4 pods.

 - fattree-config-up-connections
 - sim_log.txt

Change-Id: I6385db30cb3a26db69c117c793c1ebd2543d8e9f

  - Cleaned up connections code
  - Wrapped layout generation in #define FATTREE_CONNECTIONS
  - Replaced hard coded switch id to use r->switch_id+p->num_terminals

Change-Id: I4aa8fb074b9142a0bc2a2311c158a356f12f79cb

Change-Id: I31e9ca9f33dc4829e60c69baf9fca45efd7a0f62

Change-Id: I85a8e0d27966afda2dabfbc10a37f91ee838a1af

Change-Id: Ic968ed172e51862dbcfc63050f51ef0b5d01a3cf

Change-Id: I6677c21ebce465ab18ece457b839fa374615da75

Change-Id: Iea68b2f46526244d4c5f874b6f4b844af3e697f2

Change-Id: Ib1c9872d295dbd61d7e2dc16e5269f111107938b

Change-Id: If8c21b26eb9c04ee640e3ba3a4ab170a5b5e4555

- Moved switch reverse event handlers into separate functions located
before their forward counterparts.

- Initialized missing variables in terminal_init to zero
- Optimistic net events number is very close to sequential net events
- Vc_occupany and terminal_length changed to increment/decrement by
chunk_size instead of packet_size in packet_send_rc()
- Updated packet_send() to handle chunk level
- Many changes of packet_size to chunk_size

- Add injection load functionality to workload file
- Correspondingly adjusted stats collection to include load
- Cleaned up log file offsets to match header

- Stats are output to log file in modelnet-test directory
- Stats are added from terminal_final(), switch_final(), report_stats(),
and within main() of the synthetic workload file
- Stats include ROSS sim metrics (i.e. synch mode, gvt-interval,
rollbacks, etc.), as well as network params/results (i.e. num terminals,
num switches, workload, avg latency, max latency, etc)

- Moved terminal reverse event handlers into separate functions located
before their forward counterparts.
- Cleaned up previously commented code

- Cleaned packet_generate()
- Fixed bug in decrementing terminal_length

- Updated terminal packet generate rc handler
- Updated terminal packet arrive rc handler
- Added missing mn_stats
- Added DEBUG_RC flag to turn on data collection and output to tally all
forward and reverse event handlers

- Cleaned up debug printf output
- Added rc_stack_push and pop (replacing copy function)
- Deleted copy_fattree_list_entry() and
create_prepend_to_fattree_message_list() functions (functionality
replaced with rc_stack)

Added missing RC stack creation (fixes segfault in previous commit)
Cleaned up code
Needs verification