====== Supporting AR9003 and later NICs in FreeBSD ======

===== Overview =====

AR9003 and later support requires some driver changes as well as a new HAL. This page will cover the needed steps.

===== Steps =====

==== HAL ====

  * New HAL code
  * Extend HAL API with new methods (the AR9003 and later descriptors contain data/len pointers for up to four fragments; it also supports descriptor 'checksum' support; there are likely other things needed.)

==== Driver ====

  * PAPRD calibration support (double-check?)
  * MSI support (message-signaled interrupts, for PCIe)
  * Changes to TX/RX descriptor sizes - make it configurable at run-time? Or just compile-time?
  * Rate control changes to support 3-stream and up to MCS31
  * TX/RX DMA changes ("EDMA") to support the new ring-based TX/RX FIFO
  * RX 'high' and 'low' priority changes

==== Net80211 ====

  * Verify that 3-stream support (up to MCS31) is correctly functioning