Support for PTP software transmit timestamping in vmxnet3 driver shipped with RHEL7.

Solution In Progress - Updated -


  • Red Hat Enterprise Linux (RHEL)7.
  • Vmwarevmxnet3 driver.


  • Does vmxnet3 driver shipped in RHEL7 supports PTP transmit software timestamping?
  • Does RHEL7 kernel shippedvmxnet3 have support for SOF_TIMESTAMPING_TX_SOFTWAREoptions?


  • At present, software transmit timestamping is not available in vmxnet3 driver.
  • try using the e1000 emulated NICs for the virtual guest which implements SOF_TIMESTAMPING_TX_SOFTWARE feature.

Root Cause

  • vmnxt3 drivers does not have this feature in the upstream release versions.

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Solution is 'in progress' : does this mean RedHat have opened a dialog with VMware to request this feature in their upstream version ?