illumos gate

In MC_TX(9E), there is the following paragraph

    The mri_tx() entry point is similar to the mc_tx() entry point, except
     that it is used by device drivers that have negotiated the
     MAC_CAPAB_RINGS capability with transmit rings.  The driver should follow
     all of the same rules described earlier, except that it will access a
     ring-specific data structure through driver_rh and when it needs to
     update that there is additional space available, it must use
     mac_tx_update_ring(9F) and not mac_tx_update(9F).

mac_tx_update_ring(9F) is incorrect -- it should be mac_tx_ring_update(9F).