svn commit: r321837 - head/sys/dev/hyperv/netvsc

[Sepherosa Ziehau]

Author: sephe
Date: Tue Aug  1 02:55:43 2017
New Revision: 321837
URL: https://svnweb.freebsd.org/changeset/base/321837

Log:
  hyperv/hn: Add comment about ether_ifattach event subscription.
  
  MFC after:	3 days
  Sponsored by:	Microsoft
  Differential Revision:	https://reviews.freebsd.org/D11710

Modified:
  head/sys/dev/hyperv/netvsc/if_hn.c

Modified: head/sys/dev/hyperv/netvsc/if_hn.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/if_hn.c	Tue Aug  1 02:45:54 2017	(r321836)
+++ head/sys/dev/hyperv/netvsc/if_hn.c	Tue Aug  1 02:55:43 2017	(r321837)
@@ -1541,6 +1541,12 @@ hn_attach(device_t dev)
 	sc->hn_ifaddr_evthand = EVENTHANDLER_REGISTER(ifaddr_event,
 	    hn_ifaddr_event, sc, EVENTHANDLER_PRI_ANY);
 
+	/*
+	 * NOTE:
+	 * Subscribe ether_ifattach event, instead of ifnet_arrival event,
+	 * since interface's LLADDR is needed; interface LLADDR is not
+	 * available when ifnet_arrival event is triggered.
+	 */
 	sc->hn_ifnet_atthand = EVENTHANDLER_REGISTER(ether_ifattach_event,
 	    hn_ifnet_attevent, sc, EVENTHANDLER_PRI_ANY);
 	sc->hn_ifnet_dethand = EVENTHANDLER_REGISTER(ifnet_departure_event,