From: Stephen Hemminger <stephen@networkplumber.org>
Date: Tue, 27 Mar 2018 18:28:48 +0000 (-0700)
Subject: hv_netvsc: enable multicast if necessary
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=78c986bf85b793980cce4eb6b048492bf0aa4f82;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

hv_netvsc: enable multicast if necessary

[ Upstream commit f03dbb06dc380274e351ca4b1ee1587ed4529e62 ]

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@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index 99b55a3f189d..d1ae184008b4 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -856,7 +856,7 @@ 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;