ethtool -G ethX always returns EBUSY with Chelsio (cxgb3) NIC

Solution Verified - Updated -

Issue

  • Unable to set the NIC ring buffer on Chelsio NICs using the cxgb3 module:

    # ethtool -G eth0 rx 16384 tx 16384
    Cannot set device ring parameters: Device or resource busy
    

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Chelsio NIC hardware using cxgb3 module

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