svn commit: r312687 - in head/sys: net sys

[Dexuan Cui]

Author: dexuan
Date: Tue Jan 24 09:19:46 2017
New Revision: 312687
URL: https://svnweb.freebsd.org/changeset/base/312687

Log:
  ifnet: introduce event handlers for ifup/ifdown events
  
  Hyper-V's NIC SR-IOV implementation needs a Hyper-V synthetic NIC and
  a VF NIC to work together, mainly to support seamless live migration.
  
  When the VF device becomes UP (or DOWN), the synthetic NIC driver needs
  to switch the data path from the synthetic NIC to the VF (or the opposite).
  
  So the synthetic NIC driver needs to know when a VF device is becoming
  UP or DOWN and hence the patch is made.
  
  Reviewed by:	sephe
  Approved by:	sephe (mentor)
  MFC after:	2 weeks
  Sponsored by:	Microsoft
  Differential Revision:	https://reviews.freebsd.org/D8963

Modified:
  head/sys/net/if.c
  head/sys/sys/eventhandler.h

Modified: head/sys/net/if.c
==============================================================================
--- head/sys/net/if.c	Tue Jan 24 09:15:36 2017	(r312686)
+++ head/sys/net/if.c	Tue Jan 24 09:19:46 2017	(r312687)
@@ -59,6 +59,7 @@
 #include <sys/domain.h>
 #include <sys/jail.h>
 #include <sys/priv.h>
+#include <sys/eventhandler.h>
 
 #include <machine/stdarg.h>
 #include <vm/uma.h>
@@ -2218,6 +2219,7 @@ void
 if_down(struct ifnet *ifp)
 {
 
+	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
 	if_unroute(ifp, IFF_UP, AF_UNSPEC);
 }
 
@@ -2230,6 +2232,7 @@ if_up(struct ifnet *ifp)
 {
 
 	if_route(ifp, IFF_UP, AF_UNSPEC);
+	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
 }
 
 /*

Modified: head/sys/sys/eventhandler.h
==============================================================================
--- head/sys/sys/eventhandler.h	Tue Jan 24 09:15:36 2017	(r312686)
+++ head/sys/sys/eventhandler.h	Tue Jan 24 09:19:46 2017	(r312687)
@@ -284,4 +284,11 @@ typedef void (*swapoff_fn)(void *, struc
 EVENTHANDLER_DECLARE(swapon, swapon_fn);
 EVENTHANDLER_DECLARE(swapoff, swapoff_fn);
 
+/* ifup/ifdown events */
+#define IFNET_EVENT_UP		0
+#define IFNET_EVENT_DOWN	1
+struct ifnet;
+typedef void (*ifnet_event_fn)(void *, struct ifnet *ifp, int event);
+EVENTHANDLER_DECLARE(ifnet_event, ifnet_event_fn);
+
 #endif /* _SYS_EVENTHANDLER_H_ */