K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2010-09-27T15:24:16.602549Z
K 7
svn:log
V 896
Implement netdump interfaces for if_em and if_lem specifically and,
contemporary, rework the netdump hooks.

The netdump methods are now composed by the following interfaces:
- normal polling operation
- polling operation that tries to skip locking as much as it can
  (to be used in DDB case in order to increase chances of deadlock
  avoidance)
- functions for enabling and disabling interrupts when DEVICE_POLLING
  option is not enabled, in order to avoid problems with polling.

The normal/unlocked version of polling is a bit awkward but still used
in several places in the FreeBSD kernel and effective when entering DDB.

The implementation of netdump_methods is suited for having independency
between NETDUMP_CLIENT and DEVICE_POLLING.
Right now, the only issue left open is using unlocked version in the
KDB_UNATTENDED version too, but it is going to be fixed soon.

Reviewed by:	rstone

END