Update epair(4) to the new netisr implementation and polish

things a bit:
- use dpcpu data to track the ifps with packets queued up,
- per-cpu locking and driver flags
- along with .nh_drainedcpu and NETISR_POLICY_CPU.
- Put the mbufs in flight reference count, preventing interfaces
  from going away, under INVARIANTS as this is a general problem
  of the stack and should be solved in if.c/netisr but still good
  to verify the internal queuing logic.
- Permit changing the MTU to virtually everythinkg like we do for loopback.

Hook epair(4) up to the build.

Approved by:	re (kib)

1 files changed, 8 insertions, 0 deletions

diff --git a/sys/modules/if_epair/Makefile b/sys/modules/if_epair/Makefile
new file mode 100644
index 0000000..aaffa1f
--- /dev/null
+++ b/sys/modules/if_epair/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../net
+
+KMOD=	if_epair
+SRCS=	if_epair.c
+
+.include <bsd.kmod.mk>