MFC r196721:   Make sure rx descriptor ring align on 16 bytes. I guess the   alignment requirement could be multiple of 4 bytes but I think   using descriptor size would make intention clearer.   Previously the size of rx descriptor was not power of 2 so it   caused panic in bus_dmamem_alloc(9).
MFC r196721:
  Make sure rx descriptor ring align on 16 bytes. I guess the
  alignment requirement could be multiple of 4 bytes but I think
  using descriptor size would make intention clearer.
  Previously the size of rx descriptor was not power of 2 so it
  caused panic in bus_dmamem_alloc(9).

  Reported by:	Jeff Blank (jb000003 <> mr-happy dot com)
Approved by:	re (kib)

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