Author: sephe
Date: Mon Sep 19 07:32:08 2016
New Revision: 305965
URL: https://svnweb.freebsd.org/changeset/base/305965

Log:
  hyperv/hn: Don't allow MTU change, if it is not supported by the NVS.
  
  MFC after:    1 week
  Sponsored by: Microsoft
  Differential Revision:        https://reviews.freebsd.org/D7923

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

Modified: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
==============================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c  Mon Sep 19 07:17:43 
2016        (r305964)
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c  Mon Sep 19 07:32:08 
2016        (r305965)
@@ -1572,6 +1572,13 @@ hn_ioctl(struct ifnet *ifp, u_long cmd, 
 
                HN_LOCK(sc);
 
+               if ((sc->hn_caps & HN_CAP_MTU) == 0) {
+                       /* Can't change MTU */
+                       HN_UNLOCK(sc);
+                       error = EOPNOTSUPP;
+                       break;
+               }
+
                if (ifp->if_mtu == ifr->ifr_mtu) {
                        HN_UNLOCK(sc);
                        break;
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