K 10
svn:author
V 5
gibbs
K 8
svn:date
V 27
2011-09-21T00:15:29.360198Z
K 7
svn:log
V 689
Update netfront so that it queries and honors published
back-end features.

sys/dev/xen/netfront/netfront.c:
	o Add xn_query_features() which reads the XenStore and
	  records the TSO, LRO, and chained ring-request support
	  of the backend.
	o Rename xn_configure_lro() to xn_configure_features() and
	  use this routine to manage the setup of TSO, LRO, and
	  checksum offload.
	o In create_netdev(), initialize if_capabilities and
	  if_hwassist to the capabilities found on all backends.
	  Delegate configuration of if_capenable and the TSO flag
	  if if_hwassist to xn_configure_features().

Reported by:	Hugo Silva (fix inspired by patch provided)
Approved by:	re
MFC after:	1 week

END