Why ethtool reports "Cannot get device ring settings: Operation not supported" while viewing or changing ring buffer settings for QLogic Corp. 10GbE Converged Network Adapter(CNA)?

Solution Verified - Updated -

Issue

  • Why ethtool reports "Cannot get device ring settings: Operation not supported" while viewing or changing ring buffer settings for QLogic Corp. 10GbE Converged Network Adapter(CNA)?
  • Cannot change/view ring buffer settings for QLogic 10GbE card. 
# ethtool -g eth0
Ring parameters for eth0:
Cannot get device ring settings: Operation not supported

Environment

  • Red Hat Enterprise Linux 6 (RHEL6).
  • qlge module.
  • QLogic Corp. 10GbE Converged Network Adapter(CNA).

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