[source] lantiq: fix broadcast packets leaking on the wrong vlan on xrx200

[LEDE Commits]

nbd pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/39d03d99594db558f23eb906bd06c7ec0cd648bb

commit 39d03d99594db558f23eb906bd06c7ec0cd648bb
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Feb 22 13:31:17 2017 +0100

    lantiq: fix broadcast packets leaking on the wrong vlan on xrx200
    
    The ethernet driver uses a port map override via special tag to control
    the ports on which multicast packets are sent. This was added to work
    around an issue in the switch that was occasionally leaking packets onto
    the wrong vlan.
    Unfortunately the change had some leftover lines that were overwrting
    the port map with a list of all ports, thus always leaking packets onto
    the wront vlan.
    
    Fix this by only enabling the override with the VLAN port map and only
    if a matching VLAN port map was actually found
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 .../patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch    | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch b/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
index acaadba..b84e205 100644
--- a/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
+++ b/target/linux/lantiq/patches-4.4/0025-NET-MIPS-lantiq-adds-xrx200-net.patch
@@ -209,7 +209,7 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +};
 --- /dev/null
 +++ b/drivers/net/ethernet/lantiq_xrx200.c
-@@ -0,0 +1,1850 @@
+@@ -0,0 +1,1851 @@
 +/*
 + *   This program is free software; you can redistribute it and/or modify it
 + *   under the terms of the GNU General Public License version 2 as published
@@ -1262,6 +1262,7 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +	struct xrx200_chan *ch;
 +	struct ltq_dma_desc *desc;
 +	u32 byte_offset;
++	u16 port_map = 0;
 +	int ret = NETDEV_TX_OK;
 +	int len;
 +#ifdef SW_ROUTING
@@ -1279,8 +1280,6 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +
 +#ifdef SW_ROUTING
 +	if (is_multicast_ether_addr(eth_hdr(skb)->h_dest)) {
-+		u16 port_map = priv->port_map;
-+		special_tag |= PORT_MAP_SEL | PORT_MAP_EN;
 +		if (skb->protocol == htons(ETH_P_8021Q)) {
 +			u16 vid;
 +			int i;
@@ -1294,9 +1293,11 @@ Subject: [PATCH 25/36] NET: MIPS: lantiq: adds xrx200-net
 +				}
 +			}
 +		}
-+		special_tag |= port_map << PORT_MAP_SHIFT;
 +	}
-+	special_tag |= priv->port_map << PORT_MAP_SHIFT;
++	if (port_map) {
++		special_tag |= (port_map << PORT_MAP_SHIFT) |
++			       PORT_MAP_SEL | PORT_MAP_EN;
++	}
 +	if(priv->wan)
 +		special_tag |= (1 << DPID_SHIFT);
 +	if(skb_headroom(skb) < 4) {