igb & ixgbe - Tx timestamp hang warning and PTP time sync issues

Solution Verified - Updated -

Issue

  • igb: Tx timestamp hang warning and PTP time sync issues
  • ixgbe: Tx timestamp hang warning and PTP time sync issues
  • PTP shows jumps of +/- 50μs around the same time that igb reports the warning:

    kernel: igb 0000:01:00.0: clearing Tx timestamp hang
    

Environment

  • Red Hat Enterprise Linux
  • igb module
  • PTP

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