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Message-Id: <20260118-ks8995-fixups-v1-4-10a493f0339d@kernel.org>
Date: Sun, 18 Jan 2026 23:07:34 +0100
From: Linus Walleij <linusw@...nel.org>
To: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Woojung Huh <woojung.huh@...rochip.com>
Cc: UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
Linus Walleij <linusw@...nel.org>
Subject: [PATCH net-next 4/4] net: dsa: ks8995: Implement port isolation
It is unsound to not have proper port isolation on a
switch which supports it.
Set each port as isolated by default in the setup callback
and de-isolate and isolate the ports in the bridge join/leave
callbacks.
Fixes: a7fe8b266f65 ("net: dsa: ks8995: Add basic switch set-up")
Reported-by: Vladimir Oltean <olteanv@...il.com>
Signed-off-by: Linus Walleij <linusw@...nel.org>
---
drivers/net/dsa/ks8995.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 141 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/ks8995.c b/drivers/net/dsa/ks8995.c
index 060bc8303a14..ad985f0d0dba 100644
--- a/drivers/net/dsa/ks8995.c
+++ b/drivers/net/dsa/ks8995.c
@@ -80,6 +80,11 @@
#define KS8995_PC0_TAG_REM BIT(1) /* Enable tag removal on port */
#define KS8995_PC0_PRIO_EN BIT(0) /* Enable priority handling */
+#define KS8995_PC1_SNIFF_PORT BIT(7) /* This port is a sniffer port */
+#define KS8995_PC1_RCV_SNIFF BIT(6) /* Packets received goes to sniffer port(s) */
+#define KS8995_PC1_XMIT_SNIFF BIT(5) /* Packets transmitted goes to sniffer port(s) */
+#define KS8995_PC1_PORT_VLAN GENMASK(4, 0) /* Port isolation mask */
+
#define KS8995_PC2_TXEN BIT(2) /* Enable TX on port */
#define KS8995_PC2_RXEN BIT(1) /* Enable RX on port */
#define KS8995_PC2_LEARN_DIS BIT(0) /* Disable learning on port */
@@ -441,6 +446,44 @@ dsa_tag_protocol ks8995_get_tag_protocol(struct dsa_switch *ds,
static int ks8995_setup(struct dsa_switch *ds)
{
+ struct ks8995_switch *ks = ds->priv;
+ int ret;
+ u8 val;
+ int i;
+
+ /* Isolate all user ports so they can only send packets to itself and the CPU port */
+ for (i = 0; i < KS8995_CPU_PORT; i++) {
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on port %d\n", i);
+ return ret;
+ }
+
+ val &= ~KS8995_PC1_PORT_VLAN;
+ val |= BIT(i) | BIT(KS8995_CPU_PORT);
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on port %d\n", i);
+ return ret;
+ }
+ }
+
+ /* The CPU port should be able to talk to all ports */
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(KS8995_CPU_PORT, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on CPU port\n");
+ return ret;
+ }
+
+ val |= KS8995_PC1_PORT_VLAN;
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(KS8995_CPU_PORT, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on CPU port\n");
+ return ret;
+ }
+
return 0;
}
@@ -466,8 +509,56 @@ static int ks8995_port_bridge_join(struct dsa_switch *ds, int port,
bool *tx_fwd_offload,
struct netlink_ext_ack *extack)
{
+ struct ks8995_switch *ks = ds->priv;
+ unsigned int port_bitmap = 0;
+ int ret;
+ u8 val;
+ int i;
+
+ /* De-isolate this port from any other port on the bridge */
+ for (i = 0; i < KS8995_CPU_PORT; i++) {
+ /* Current port handled last */
+ if (i == port)
+ continue;
+ /* Not on this bridge */
+ if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
+ continue;
+
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on port %d\n", i);
+ return ret;
+ }
+
+ val |= BIT(port);
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on port %d\n", i);
+ return ret;
+ }
+
+ /* Accumulate this port for access by current */
+ port_bitmap |= BIT(i);
+ }
+
+ /* Let current port access all other ports on the bridge */
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(port, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on port %d\n", port);
+ return ret;
+ }
+
+ val |= BIT(port_bitmap);
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(port, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on port %d\n", port);
+ return ret;
+ }
+
/* port_stp_state_set() will be called after to put the port in
- * appropriate state so there is no need to do anything.
+ * appropriate state.
*/
return 0;
@@ -476,8 +567,56 @@ static int ks8995_port_bridge_join(struct dsa_switch *ds, int port,
static void ks8995_port_bridge_leave(struct dsa_switch *ds, int port,
struct dsa_bridge bridge)
{
+ struct ks8995_switch *ks = ds->priv;
+ unsigned int port_bitmap = 0;
+ int ret;
+ u8 val;
+ int i;
+
+ /* Isolate this port from any other port on the bridge */
+ for (i = 0; i < KS8995_CPU_PORT; i++) {
+ /* Current port handled last */
+ if (i == port)
+ continue;
+ /* Not on this bridge */
+ if (!dsa_port_offloads_bridge(dsa_to_port(ds, i), &bridge))
+ continue;
+
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on port %d\n", i);
+ return;
+ }
+
+ val &= ~BIT(port);
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(i, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on port %d\n", i);
+ return;
+ }
+
+ /* Accumulate this port for access by current */
+ port_bitmap |= BIT(i);
+ }
+
+ /* Isolate this port from all other ports formerly on the bridge */
+ ret = ks8995_read_reg(ks, KS8995_REG_PC(port, KS8995_REG_PC1), &val);
+ if (ret) {
+ dev_err(ks->dev, "failed to read KS8995_REG_PC1 on port %d\n", port);
+ return;
+ }
+
+ val &= ~BIT(port_bitmap);
+
+ ret = ks8995_write_reg(ks, KS8995_REG_PC(port, KS8995_REG_PC1), val);
+ if (ret) {
+ dev_err(ks->dev, "failed to write KS8995_REG_PC1 on port %d\n", port);
+ return;
+ }
+
/* port_stp_state_set() will be called after to put the port in
- * forwarding state so there is no need to do anything.
+ * forwarding state.
*/
}
--
2.52.0
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