Patch "mvpp2: fix multicast address filter" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

mvpp2: fix multicast address filter

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mvpp2-fix-multicast-address-filter.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Mikulas Patocka <[email protected]>
Date: Sun, 11 Feb 2018 18:10:28 -0500
Subject: mvpp2: fix multicast address filter

From: Mikulas Patocka <[email protected]>

commit 7ac8ff95f48cbfa609a060fd6a1e361dd62feeb3 upstream.

IPv6 doesn't work on the MacchiatoBIN board. It is caused by broken multicast address filter in the mvpp2 driver.

The driver loads doesn't load any multicast entries if "allmulti" is not set. This condition should be reversed.

The condition !netdev_mc_empty(dev) is useless (because netdev_for_each_mc_addr is nop if the list is empty).

This patch also fixes a possible overflow of the multicast list - if mvpp2_prs_mac_da_accept fails, we set the allmulti flag and retry.

---
 drivers/net/ethernet/marvell/mvpp2.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

@@ -5657,6 +5657,7 @@ static void mvpp2_set_rx_mode(struct net
 	int id = port->id;
 	bool allmulti = dev->flags & IFF_ALLMULTI;
 
+retry:
 	mvpp2_prs_mac_promisc_set(priv, id, dev->flags & IFF_PROMISC);
 	mvpp2_prs_mac_multi_set(priv, id, MVPP2_PE_MAC_MC_ALL, allmulti);
 	mvpp2_prs_mac_multi_set(priv, id, MVPP2_PE_MAC_MC_IP6, allmulti);

@@ -5664,9 +5665,13 @@ static void mvpp2_set_rx_mode(struct net
 	/* Remove all port->id's mcast enries */
 	mvpp2_prs_mcast_del_all(priv, id);
 
-	if (allmulti && !netdev_mc_empty(dev)) {
-		netdev_for_each_mc_addr(ha, dev)
-			mvpp2_prs_mac_da_accept(priv, id, ha->addr, true);
+	if (!allmulti) {
+		netdev_for_each_mc_addr(ha, dev) {
+			if (mvpp2_prs_mac_da_accept(priv, id, ha->addr, true)) {
+				allmulti = true;
+				goto retry;
+			}
+		}
 	}
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/mvpp2-fix-multicast-address-filter.patch