diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 6be9fed50ed5..976f06462223 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -26,7 +26,6 @@
 #include "sja1105_tas.h"
 
 #define SJA1105_UNKNOWN_MULTICAST	0x010000000000ull
-#define SJA1105_DEFAULT_VLAN		(VLAN_N_VID - 1)
 
 static void sja1105_hw_reset(struct gpio_desc *gpio, unsigned int pulse_len,
 			     unsigned int startup_delay)
@@ -136,6 +135,9 @@ static int sja1105_commit_pvid(struct dsa_switch *ds, int port)
 			drop_untagged = true;
 	}
 
+	if (dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port))
+		drop_untagged = true;
+
 	return sja1105_drop_untagged(ds, port, drop_untagged);
 }
 
@@ -217,6 +219,12 @@ static int sja1105_init_mac_settings(struct sja1105_private *priv)
 		 */
 		if (dsa_port_is_dsa(dp))
 			dp->learning = true;
+
+		/* Disallow untagged packets from being received on the
+		 * CPU and DSA ports.
+		 */
+		if (dsa_port_is_cpu(dp) || dsa_port_is_dsa(dp))
+			mac[dp->index].drpuntag = true;
 	}
 
 	return 0;
diff --git a/include/linux/dsa/sja1105.h b/include/linux/dsa/sja1105.h
index 6b0dc9ff92d1..8c5601f1c979 100644
--- a/include/linux/dsa/sja1105.h
+++ b/include/linux/dsa/sja1105.h
@@ -16,6 +16,8 @@
 #define ETH_P_SJA1105_META			0x0008
 #define ETH_P_SJA1110				0xdadc
 
+#define SJA1105_DEFAULT_VLAN			(VLAN_N_VID - 1)
+
 /* IEEE 802.3 Annex 57A: Slow Protocols PDUs (01:80:C2:xx:xx:xx) */
 #define SJA1105_LINKLOCAL_FILTER_A		0x0180C2000000ull
 #define SJA1105_LINKLOCAL_FILTER_A_MASK		0xFFFFFF000000ull
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index 5b80a9049e2c..a49308fbd19f 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -168,6 +168,36 @@ static struct sk_buff *sja1105_imprecise_xmit(struct sk_buff *skb,
 	return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp), tx_vid);
 }
 
+/* Transform untagged control packets into pvid-tagged control packets so that
+ * all packets sent by this tagger are VLAN-tagged and we can configure the
+ * switch to drop untagged packets coming from the DSA master.
+ */
+static struct sk_buff *sja1105_pvid_tag_control_pkt(struct dsa_port *dp,
+						    struct sk_buff *skb, u8 pcp)
+{
+	__be16 xmit_tpid = htons(sja1105_xmit_tpid(dp));
+	struct vlan_ethhdr *hdr;
+
+	/* If VLAN tag is in hwaccel area, move it to the payload
+	 * to deal with both cases uniformly and to ensure that
+	 * the VLANs are added in the right order.
+	 */
+	if (unlikely(skb_vlan_tag_present(skb))) {
+		skb = __vlan_hwaccel_push_inside(skb);
+		if (!skb)
+			return NULL;
+	}
+
+	hdr = (struct vlan_ethhdr *)skb_mac_header(skb);
+
+	/* If skb is already VLAN-tagged, leave that VLAN ID in place */
+	if (hdr->h_vlan_proto == xmit_tpid)
+		return skb;
+
+	return vlan_insert_tag(skb, xmit_tpid, (pcp << VLAN_PRIO_SHIFT) |
+			       SJA1105_DEFAULT_VLAN);
+}
+
 static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
 				    struct net_device *netdev)
 {
@@ -183,8 +213,13 @@ static struct sk_buff *sja1105_xmit(struct sk_buff *skb,
 	 * but instead SPI-installed management routes. Part 2 of this
 	 * is the .port_deferred_xmit driver callback.
 	 */
-	if (unlikely(sja1105_is_link_local(skb)))
+	if (unlikely(sja1105_is_link_local(skb))) {
+		skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
+		if (!skb)
+			return NULL;
+
 		return sja1105_defer_xmit(dp, skb);
+	}
 
 	return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
 			     ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
@@ -213,6 +248,10 @@ static struct sk_buff *sja1110_xmit(struct sk_buff *skb,
 		return dsa_8021q_xmit(skb, netdev, sja1105_xmit_tpid(dp),
 				     ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
 
+	skb = sja1105_pvid_tag_control_pkt(dp, skb, pcp);
+	if (!skb)
+		return NULL;
+
 	skb_push(skb, SJA1110_HEADER_LEN);
 
 	dsa_alloc_etype_header(skb, SJA1110_HEADER_LEN);