netdev - [PATCH v2 1/5] net: dsa: lantiq: Allow special tags only on CPU port

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Date:   Sun,  5 May 2019 23:15:13 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     davem@...emloft.net
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>
Subject: [PATCH v2 1/5] net: dsa: lantiq: Allow special tags only on CPU port

Allow the special tag in ingress only on the CPU port and not on all
ports. A packet with a special tag could circumvent the hardware
forwarding and should only be allowed on the CPU port where Linux
controls the port.

Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
---
 drivers/net/dsa/lantiq_gswip.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index d8328866908c..0a2259cb09df 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -461,8 +461,6 @@ static int gswip_port_enable(struct dsa_switch *ds, int port,
 			 GSWIP_FDMA_PCTRLp(port));
 	gswip_switch_mask(priv, 0, GSWIP_SDMA_PCTRL_EN,
 			  GSWIP_SDMA_PCTRLp(port));
-	gswip_switch_mask(priv, 0, GSWIP_PCE_PCTRL_0_INGRESS,
-			  GSWIP_PCE_PCTRL_0p(port));
 
 	if (!dsa_is_cpu_port(ds, port)) {
 		u32 macconf = GSWIP_MDIO_PHY_LINK_AUTO |
@@ -578,6 +576,10 @@ static int gswip_setup(struct dsa_switch *ds)
 	gswip_switch_mask(priv, 0, GSWIP_FDMA_PCTRL_STEN,
 			  GSWIP_FDMA_PCTRLp(cpu_port));
 
+	/* accept special tag in ingress direction */
+	gswip_switch_mask(priv, 0, GSWIP_PCE_PCTRL_0_INGRESS,
+			  GSWIP_PCE_PCTRL_0p(cpu_port));
+
 	gswip_switch_mask(priv, 0, GSWIP_MAC_CTRL_2_MLEN,
 			  GSWIP_MAC_CTRL_2p(cpu_port));
 	gswip_switch_w(priv, VLAN_ETH_FRAME_LEN + 8, GSWIP_MAC_FLEN);
-- 
2.20.1