Feat/traffic manager voq#25
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…(P1-P2)
First stage of the high-fidelity Traffic Manager that will replace the
output-only NSQueueingLogicPriRL scheduler. This lands the standalone,
event-driven, thread-free core; it is not yet wired into P4CoreV1model.
P1 - Input-side VOQ + accounting:
* VOQ[in][out][priority], 8 priority levels (7 = highest), N*N*8 queues,
stored flat because TmItem is move-only.
* Finite-buffer accounting: global / per-input / per-VOQ byte counters
with configurable limits (0 = unlimited).
* Admission control with explicit drop reasons (global, input, VOQ full);
egress drop reasons defined for later phases.
* Modular packet-format boundary: carries an opaque move-only TmPayload,
never assumes ns3::Packet (bm::Packet wrapper comes with integration).
* TracedCallbacks (enqueue/dequeue/drop/delays) and cumulative TmStats.
P2 - Fabric scheduler:
* Priority-first maximal matching (one input and one output per round),
behind an overridable DoRunFabricScheduler() so iSLIP / round-robin can
drop in later.
Tests (test/p4-traffic-manager-test-suite.cc, 6 cases, all passing on
ns-3.39): enqueue/dequeue + accounting, priority scheduling, per-input VOQ
isolation, one-in/one-out matching, drop-reason correctness, and delay
measurement in simulated time.
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