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D7923.id20479.diff
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D7923.id20479.diff

Index: head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
===================================================================
--- head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
+++ head/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c
@@ -1572,6 +1572,13 @@
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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