K 10
svn:author
V 7
yongari
K 8
svn:date
V 27
2009-06-18T05:46:33.036626Z
K 7
svn:log
V 1970
MFC r193293-193294:
r193293:
  Add preliminary Yukon Extreme support and register definitions.
  Yukon Extreme uses new descriptor format for TSO and has Tx frame
  parser which greatly reduces CPU cycles spent in computing TCP/UDP
  payload offset calculation in Tx checksum offloading path. The new
  descriptor format also removed TCP/UDP payload computation for TSO
  which in turn results in better TSO performance. It seems Yukon
  Extreme has a lot of new (unknown) features but only basic
  offloading is supported at this time. So far there are two known
  issues.
   o Sometimes Rx overrun errors happen when pulling data over
     gigabit link. Running over 100Mbps seem to ok.
   o Ethernet hardware address shows all-zeroed value on 88E8070.
     Assigning ethernet address with ifconfig is necessary to make it
     work.
  Support for Yukon Extreme is not perfect but it would be better
  than having a non-working device. Special thanks to jbh who fixed
  several bugs of initial patch.

  Tested by:	jhb, Warren Block ( wblock <> wonkity dot com )

r193294:
  Add frame parser capability of Yukon FE+ and Yukon Extreme. With
  this feature hardware automatically computes TCP/UDP payload
  offset. Introduce MSK_FLAG_AUTOTX_CSUM to mark the capability.
  Yukon Extreme B0 revision is known to have a silicon for the
  feature so disable it. Yukon Extreme B0 still can do Tx checksum
  offloading but CPU have to compute TCP/UDP payload offset. To
  enable traditional checksum offloading, disable automatic Tx
  checksum calculation capability.
  Yukon Extreme A0 revision could not use store-and-forward mode for
  jumbo frames(silicon bug) so disable Tx checksum offloading for
  jumbo frames.

  I believe controllers that have MSK_FLAG_AUTOTX_CSUM capability or
  new descriptor format do not have Tx checksum offload bug so
  disable checksum offloading workaround for for short frames.
  Tested by:	jhb, Warren Block ( wblock <> wonkity dot com )

END