K 10
svn:author
V 2
np
K 8
svn:date
V 27
2014-05-07T04:00:05.448441Z
K 7
svn:log
V 843
MFC r255050, r255052.

r255050:
Implement support for rx buffer packing.  Enable it by default for T5
cards.

This is a T4 and T5 chip feature which lets the chip deliver multiple
Ethernet frames in a single buffer.  This is more efficient within the
chip, in the driver, and reduces wastage of space in rx buffers.

- Always allocate rx buffers from the jumbop zone, no matter what the
  MTU is.  Do not use the normal cluster refcounting mechanism.
- Reserve space for an mbuf and a refcount in the cluster itself and let
  the chip DMA multiple frames in the rest.
- Use the embedded mbuf for the first frame and allocate mbufs on the
  fly for any additional frames delivered in the cluster.  Each of these
  mbufs has a reference on the underlying cluster.

r255052:
Fix the sysctl that displays whether buffer packing is enabled
or not.

END