Once packets dequeued from port 0, still inflight stats shown same as dequeued count.
After that, enqueue failure happens for port 2 from another core due to it reaches Max Enqueue depth .

Port 0 Stats:

Below case, port 0 dequeued 4096 packets and still inflight showed the same value.

  rx   0  drop 0  tx   4096   inflight 4096  

Full Stats:

Dev=0 Port=1EventDev todo-fix-name: ports 3, qids 1
rx   32768
drop 0
tx   4096
sched calls: 628945658
sched cq/qid call: 628964843
sched no IQ enq: 628926401
sched no CQ enq: 628942982
inflight 32768, credits: 0

Port 0
  rx   0  drop 0  tx   4096   inflight 4096
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:100% 1-4:0.00% 5-8:0.00% 9-12:0.00%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128
Port 1
  rx   0  drop 0  tx   0  inflight 0
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:100%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128
Port 2
  rx   32768  drop 0  tx   0  inflight 0
  Max New: 32768  Avg cycles PP: 0    Credits: 0
  Receive burst distribution:
      0:-nan%
  rx ring used:    0 free: 4096
  cq ring used:    0 free:  128

Queue 0 (Atomic)
  rx   32768  drop 0  tx   4096
  Per Port Stats:
    Port 0: Pkts: 4096    Flows: 1
    Port 1: Pkts: 0   Flows: 0
    Port 2: Pkts: 0   Flows: 0
    Port 3: Pkts: 0   Flows: 0
  iq 0: Used 28672

This issue will be resolved once system level restart is done.

Kindly give insight on this issue, if you found any clues. 

TIA.

Regards

Hariharan