[azure-edge:x][PATCH 2/2] UBUNTU: SAUCE: hv_netvsc: enable multicast if necessary

[Marcelo Henrique Cerri]

From: Stephen Hemminger <stephen at networkplumber.org>

BugLink: http://bugs.launchpad.net/bugs/1759885

My recent change to netvsc drive in how receive flags are handled
broke multicast.  The Hyper-v/Azure virtual interface there is not a
multicast filter list, filtering is only all or none. The driver must
enable all multicast if any multicast address is present.

Fixes: 009f766ca238 ("hv_netvsc: filter multicast/broadcast")
Signed-off-by: Stephen Hemminger <sthemmin at microsoft.com>
Signed-off-by: Marcelo Henrique Cerri <marcelo.cerri at canonical.com>
---
 drivers/net/hyperv/rndis_filter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index c4bf28d5ba92..71d2ad127536 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -861,7 +861,7 @@ static void rndis_set_multicast(struct work_struct *w)
 	if (flags & IFF_PROMISC) {
 		filter = NDIS_PACKET_TYPE_PROMISCUOUS;
 	} else {
-		if (flags & IFF_ALLMULTI)
+		if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
 			filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
 		if (flags & IFF_BROADCAST)
 			filter |= NDIS_PACKET_TYPE_BROADCAST;
-- 
2.7.4