[PATCH] dsa: vsc73xx: add support for vlan filtering

From: Pawel Dembicki
Date: Wed Jan 20 2021 - 01:38:07 EST

This patch adds support for vlan filtering in vsc73xx driver.

After vlan filtering enable, CPU_PORT is configured as trunk, without
non-tagged frames. This allows to avoid problems with transmit untagged
frames because vsc73xx is DSA_TAG_PROTO_NONE.

Signed-off-by: Pawel Dembicki <paweldembicki@xxxxxxxxx>
---
drivers/net/dsa/vitesse-vsc73xx-core.c | 311 ++++++++++++++++++++++++-
1 file changed, 310 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index 19ce4aa0973b..bf805eb9d3a6 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -39,6 +39,7 @@
#define VSC73XX_BLOCK_SYSTEM 0x7 /* Only subblock 0 */

#define CPU_PORT 6 /* CPU port */
+#define VLAN_TABLE_ATTEMPTS 10

/* MAC Block registers */
#define VSC73XX_MAC_CFG 0x00
@@ -62,6 +63,8 @@
#define VSC73XX_CAT_DROP 0x6e
#define VSC73XX_CAT_PR_MISC_L2 0x6f
#define VSC73XX_CAT_PR_USR_PRIO 0x75
+#define VSC73XX_CAT_VLAN_MISC 0x79
+#define VSC73XX_CAT_PORT_VLAN 0x7a
#define VSC73XX_Q_MISC_CONF 0xdf

/* MAC_CFG register bits */
@@ -122,6 +125,17 @@
#define VSC73XX_ADVPORTM_IO_LOOPBACK BIT(1)
#define VSC73XX_ADVPORTM_HOST_LOOPBACK BIT(0)

+/* TXUPDCFG transmit modify setup bits */
+#define VSC73XX_TXUPDCFG_DSCP_REWR_MODE GENMASK(20, 19)
+#define VSC73XX_TXUPDCFG_DSCP_REWR_ENA BIT(18)
+#define VSC73XX_TXUPDCFG_TX_INT_TO_USRPRIO_ENA BIT(17)
+#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID GENMASK(15, 4)
+#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA BIT(3)
+#define VSC73XX_TXUPDCFG_TX_UPDATE_CRC_CPU_ENA BIT(1)
+#define VSC73XX_TXUPDCFG_TX_INSERT_TAG BIT(0)
+
+#define VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT 4
+
/* CAT_DROP categorizer frame dropping register bits */
#define VSC73XX_CAT_DROP_DROP_MC_SMAC_ENA BIT(6)
#define VSC73XX_CAT_DROP_FWD_CTRL_ENA BIT(4)
@@ -135,6 +149,15 @@
#define VSC73XX_Q_MISC_CONF_EARLY_TX_512 (1 << 1)
#define VSC73XX_Q_MISC_CONF_MAC_PAUSE_MODE BIT(0)

+/* CAT_VLAN_MISC categorizer VLAN miscellaneous bits*/
+#define VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA BIT(8)
+#define VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA BIT(7)
+
+/* CAT_PORT_VLAN categorizer port VLAN*/
+#define VSC73XX_CAT_PORT_VLAN_VLAN_CFI BIT(15)
+#define VSC73XX_CAT_PORT_VLAN_VLAN_USR_PRIO GENMASK(14, 12)
+#define VSC73XX_CAT_PORT_VLAN_VLAN_VID GENMASK(11, 0)
+
/* Frame analyzer block 2 registers */
#define VSC73XX_STORMLIMIT 0x02
#define VSC73XX_ADVLEARN 0x03
@@ -185,7 +208,8 @@
#define VSC73XX_VLANACCESS_VLAN_MIRROR BIT(29)
#define VSC73XX_VLANACCESS_VLAN_SRC_CHECK BIT(28)
#define VSC73XX_VLANACCESS_VLAN_PORT_MASK GENMASK(9, 2)
-#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK GENMASK(2, 0)
+#define VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT 2
+#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK GENMASK(1, 0)
#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_IDLE 0
#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_READ_ENTRY 1
#define VSC73XX_VLANACCESS_VLAN_TBL_CMD_WRITE_ENTRY 2
@@ -557,6 +581,287 @@ static enum dsa_tag_protocol vsc73xx_get_tag_protocol(struct dsa_switch *ds,
return DSA_TAG_PROTO_NONE;
}

+static int
+vsc73xx_port_wait_for_vlan_table_cmd(struct vsc73xx *vsc, int attempts)
+{
+ u32 val;
+ int i;
+
+ for (i = 0; i <= attempts; i++) {
+ vsc73xx_read(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS,
+ &val);
+ if ((val & VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK) ==
+ VSC73XX_VLANACCESS_VLAN_TBL_CMD_IDLE)
+ return 0;
+ }
+ return -EBUSY;
+}
+
+static int
+vsc73xx_port_read_vlan_table_entry(struct dsa_switch *ds, u16 vid, u8 *portmap)
+{
+ struct vsc73xx *vsc = ds->priv;
+ u32 val;
+ int ret;
+
+ if (vid > 4095)
+ return -EPERM;
+ vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANTIDX, vid);
+ ret = vsc73xx_port_wait_for_vlan_table_cmd(vsc, VLAN_TABLE_ATTEMPTS);
+ if (ret)
+ return ret;
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS,
+ VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK,
+ VSC73XX_VLANACCESS_VLAN_TBL_CMD_READ_ENTRY);
+ ret = vsc73xx_port_wait_for_vlan_table_cmd(vsc, VLAN_TABLE_ATTEMPTS);
+ if (ret)
+ return ret;
+ vsc73xx_read(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS, &val);
+ *portmap =
+ (val & VSC73XX_VLANACCESS_VLAN_PORT_MASK) >>
+ VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT;
+ return 0;
+}
+
+static int
+vsc73xx_port_write_vlan_table_entry(struct dsa_switch *ds, u16 vid, u8 portmap)
+{
+ struct vsc73xx *vsc = ds->priv;
+ int ret;
+
+ if (vid > 4095)
+ return -EPERM;
+ vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANTIDX, vid);
+ ret = vsc73xx_port_wait_for_vlan_table_cmd(vsc, VLAN_TABLE_ATTEMPTS);
+ if (ret)
+ return ret;
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANACCESS,
+ VSC73XX_VLANACCESS_VLAN_SRC_CHECK |
+ VSC73XX_VLANACCESS_VLAN_TBL_CMD_MASK |
+ VSC73XX_VLANACCESS_VLAN_PORT_MASK,
+ VSC73XX_VLANACCESS_VLAN_SRC_CHECK |
+ VSC73XX_VLANACCESS_VLAN_TBL_CMD_WRITE_ENTRY |
+ (portmap <<
+ VSC73XX_VLANACCESS_VLAN_PORT_MASK_SHIFT));
+ ret = vsc73xx_port_wait_for_vlan_table_cmd(vsc, VLAN_TABLE_ATTEMPTS);
+ if (ret)
+ return ret;
+ return 0;
+}
+
+static int
+vsc73xx_port_update_vlan_table(struct dsa_switch *ds, int port, u16 vid_begin,
+ u16 vid_end, bool set)
+{
+ u8 portmap;
+ int ret;
+ u16 i;
+
+ if (vid_begin > 4095 || vid_end > 4095 || vid_begin > vid_end)
+ return -EPERM;
+
+ for (i = vid_begin; i <= vid_end; i++) {
+ ret = vsc73xx_port_read_vlan_table_entry(ds, i, &portmap);
+ if (ret)
+ return ret;
+ if (set)
+ portmap |= BIT(port);
+ else
+ portmap &= ~BIT(port);
+
+ ret = vsc73xx_port_write_vlan_table_entry(ds, i, portmap);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+static int vsc73xx_port_set_vlan_unaware(struct dsa_switch *ds, int port)
+{
+ struct vsc73xx *vsc = ds->priv;
+ int ret;
+
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_MAC_CFG,
+ VSC73XX_MAC_CFG_VLAN_AWR,
+ ~VSC73XX_MAC_CFG_VLAN_AWR);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_MAC_CFG,
+ VSC73XX_MAC_CFG_VLAN_DBLAWR,
+ ~VSC73XX_MAC_CFG_VLAN_DBLAWR);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_VLAN_MISC,
+ VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA,
+ VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_VLAN_MISC,
+ VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA,
+ VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_TAGGED_ENA,
+ ~VSC73XX_CAT_DROP_TAGGED_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA,
+ ~VSC73XX_CAT_DROP_UNTAGGED_ENA);
+
+ ret = vsc73xx_port_update_vlan_table(ds, port, 0, 4095, 0);
+ return ret;
+}
+
+static int vsc73xx_port_set_vlan_aware(struct dsa_switch *ds, int port)
+{
+ struct vsc73xx *vsc = ds->priv;
+ int ret;
+
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_MAC_CFG,
+ VSC73XX_MAC_CFG_VLAN_AWR, VSC73XX_MAC_CFG_VLAN_AWR);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_MAC_CFG,
+ VSC73XX_MAC_CFG_VLAN_DBLAWR,
+ ~VSC73XX_MAC_CFG_VLAN_DBLAWR);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_VLAN_MISC,
+ VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA,
+ ~VSC73XX_CAT_VLAN_MISC_VLAN_TCI_IGNORE_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_VLAN_MISC,
+ VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA,
+ ~VSC73XX_CAT_VLAN_MISC_VLAN_KEEP_TAG_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_TAGGED_ENA,
+ ~VSC73XX_CAT_DROP_TAGGED_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_INSERT_TAG,
+ VSC73XX_TXUPDCFG_TX_INSERT_TAG);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port, VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA,
+ ~VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA);
+
+ if (port == CPU_PORT)
+ ret = vsc73xx_port_update_vlan_table(ds, port, 0, 4095, 1);
+ else
+ ret = vsc73xx_port_update_vlan_table(ds, port, 0, 4095, 0);
+ return ret;
+}
+
+static int
+vsc73xx_port_vlan_filtering(struct dsa_switch *ds, int port,
+ bool vlan_filtering, struct switchdev_trans *trans)
+{
+ int ret;
+
+ if (switchdev_trans_ph_prepare(trans))
+ return 0;
+
+ if (vlan_filtering) {
+ ret = vsc73xx_port_set_vlan_aware(ds, port);
+ if (ret)
+ return ret;
+ ret = vsc73xx_port_set_vlan_aware(ds, CPU_PORT);
+ } else {
+ ret = vsc73xx_port_set_vlan_unaware(ds, port);
+ }
+ return ret;
+}
+
+static int vsc73xx_port_vlan_prepare(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_port_vlan *vlan)
+{
+ /* nothing needed */
+ return 0;
+}
+
+static void vsc73xx_port_vlan_add(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_port_vlan *vlan)
+{
+ bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+ bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
+ struct vsc73xx *vsc = ds->priv;
+ int ret;
+ u32 tmp;
+
+ if (!dsa_port_is_vlan_filtering(dsa_to_port(ds, port)))
+ return;
+
+ ret = vsc73xx_port_update_vlan_table(ds, port, vlan->vid_begin,
+ vlan->vid_end, 1);
+ if (ret)
+ return;
+
+ if (untagged && port != CPU_PORT) {
+ /* VSC73xx can have only one untagged vid per port. */
+ vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG, &tmp);
+
+ if (tmp & VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA)
+ dev_warn(vsc->dev,
+ "Chip support only one untagged VID per port. Overwriting...\n");
+
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID,
+ (vlan->vid_end <<
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT) &
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA);
+ }
+ if (pvid && port != CPU_PORT) {
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA,
+ ~VSC73XX_CAT_DROP_UNTAGGED_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_CAT_PORT_VLAN,
+ VSC73XX_CAT_PORT_VLAN_VLAN_VID,
+ vlan->vid_end &
+ VSC73XX_CAT_PORT_VLAN_VLAN_VID);
+ }
+}
+
+static int vsc73xx_port_vlan_del(struct dsa_switch *ds, int port,
+ const struct switchdev_obj_port_vlan *vlan)
+{
+ bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
+ bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
+ struct vsc73xx *vsc = ds->priv;
+ u32 tmp, untagged_vid;
+ int ret;
+
+ if (!dsa_port_is_vlan_filtering(dsa_to_port(ds, port)))
+ return -EINVAL;
+
+ ret =
+ vsc73xx_port_update_vlan_table(ds, port, vlan->vid_begin,
+ vlan->vid_end, 0);
+ if (ret)
+ return ret;
+
+ /* VSC73xx can have only one untagged vid per port. Check if match. */
+ vsc73xx_read(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG, &tmp);
+ untagged_vid = (tmp & VSC73XX_TXUPDCFG_TX_UNTAGGED_VID)
+ >> VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_SHIFT;
+
+ if (untagged && untagged_vid == vlan->vid_end) {
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA,
+ ~VSC73XX_TXUPDCFG_TX_UNTAGGED_VID_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_TXUPDCFG,
+ VSC73XX_TXUPDCFG_TX_UNTAGGED_VID, 0);
+ }
+ if (pvid) {
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_CAT_DROP,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA,
+ VSC73XX_CAT_DROP_UNTAGGED_ENA);
+ vsc73xx_update_bits(vsc, VSC73XX_BLOCK_MAC, port,
+ VSC73XX_CAT_PORT_VLAN,
+ VSC73XX_CAT_PORT_VLAN_VLAN_VID, 0);
+ }
+ return 0;
+}
+
static int vsc73xx_setup(struct dsa_switch *ds)
{
struct vsc73xx *vsc = ds->priv;
@@ -1051,6 +1356,10 @@ static const struct dsa_switch_ops vsc73xx_ds_ops = {
.port_disable = vsc73xx_port_disable,
.port_change_mtu = vsc73xx_change_mtu,
.port_max_mtu = vsc73xx_get_max_mtu,
+ .port_vlan_filtering = vsc73xx_port_vlan_filtering,
+ .port_vlan_prepare = vsc73xx_port_vlan_prepare,
+ .port_vlan_add = vsc73xx_port_vlan_add,
+ .port_vlan_del = vsc73xx_port_vlan_del,
};

static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
--
2.25.1