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 <sthem...@microsoft.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 00ec80c23fe5..8799b0590adc 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -864,7 +864,7 @@ 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;
--
2.16.2
