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Date: Fri, 29 Oct 2021 14:26:09 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc: andrew@...n.ch, netdev@...r.kernel.org, robh+dt@...nel.org,
UNGLinuxDriver@...rochip.com, Woojung.Huh@...rochip.com,
hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
kuba@...nel.org, linux-kernel@...r.kernel.org,
vivien.didelot@...il.com, f.fainelli@...il.com,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 net-next 10/10] net: dsa: microchip: add support for
vlan operations
On Fri, Oct 29, 2021 at 10:52:56AM +0530, Prasanna Vengateshan wrote:
> Support for VLAN add, del, prepare and filtering operations.
>
> The VLAN aware is a global setting. Mixed vlan filterings
> are not supported. vlan_filtering_is_global is made as true
> in lan937x_setup function.
>
> Signed-off-by: Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
> ---
> drivers/net/dsa/microchip/lan937x_main.c | 188 +++++++++++++++++++++++
> 1 file changed, 188 insertions(+)
>
> diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
> index 980fd74b3bc1..3f1f86633173 100644
> --- a/drivers/net/dsa/microchip/lan937x_main.c
> +++ b/drivers/net/dsa/microchip/lan937x_main.c
> @@ -17,6 +17,14 @@
> #include "ksz_common.h"
> #include "lan937x_dev.h"
>
> +static int lan937x_wait_vlan_ctrl_ready(struct ksz_device *dev)
> +{
> + unsigned int val;
> +
> + return regmap_read_poll_timeout(dev->regmap[0], REG_SW_VLAN_CTRL, val,
> + !(val & VLAN_START), 10, 1000);
> +}
> +
> static u8 lan937x_get_fid(u16 vid)
> {
> if (vid > ALU_FID_SIZE)
> @@ -25,6 +33,97 @@ static u8 lan937x_get_fid(u16 vid)
> return vid;
> }
>
> +static int lan937x_get_vlan_table(struct ksz_device *dev, u16 vid,
> + struct lan937x_vlan *vlan_entry)
> +{
> + u32 data;
> + int ret;
> +
> + mutex_lock(&dev->vlan_mutex);
> +
> + ret = ksz_write16(dev, REG_SW_VLAN_ENTRY_INDEX__2, vid & VLAN_INDEX_M);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write8(dev, REG_SW_VLAN_CTRL, VLAN_READ | VLAN_START);
> + if (ret < 0)
> + goto exit;
> +
> + /* wait to be cleared */
> + ret = lan937x_wait_vlan_ctrl_ready(dev);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_read32(dev, REG_SW_VLAN_ENTRY__4, &data);
> + if (ret < 0)
> + goto exit;
> +
> + vlan_entry->valid = !!(data & VLAN_VALID);
> + vlan_entry->fid = data & VLAN_FID_M;
> +
> + ret = ksz_read32(dev, REG_SW_VLAN_ENTRY_UNTAG__4,
> + &vlan_entry->untag_prtmap);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_read32(dev, REG_SW_VLAN_ENTRY_PORTS__4,
> + &vlan_entry->fwd_map);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write8(dev, REG_SW_VLAN_CTRL, 0);
> + if (ret < 0)
> + goto exit;
> +
> +exit:
> + mutex_unlock(&dev->vlan_mutex);
> +
> + return ret;
> +}
> +
> +static int lan937x_set_vlan_table(struct ksz_device *dev, u16 vid,
> + struct lan937x_vlan *vlan_entry)
> +{
> + u32 data;
> + int ret;
> +
> + mutex_lock(&dev->vlan_mutex);
> +
> + data = vlan_entry->valid ? VLAN_VALID : 0;
> + data |= vlan_entry->fid;
> +
> + ret = ksz_write32(dev, REG_SW_VLAN_ENTRY__4, data);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write32(dev, REG_SW_VLAN_ENTRY_UNTAG__4,
> + vlan_entry->untag_prtmap);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write32(dev, REG_SW_VLAN_ENTRY_PORTS__4, vlan_entry->fwd_map);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write16(dev, REG_SW_VLAN_ENTRY_INDEX__2, vid & VLAN_INDEX_M);
> + if (ret < 0)
> + goto exit;
> +
> + ret = ksz_write8(dev, REG_SW_VLAN_CTRL, VLAN_START | VLAN_WRITE);
> + if (ret < 0)
> + goto exit;
> +
> + /* wait to be cleared */
> + ret = lan937x_wait_vlan_ctrl_ready(dev);
> + if (ret < 0)
> + goto exit;
> +
> +exit:
> + mutex_unlock(&dev->vlan_mutex);
> +
> + return ret;
> +}
> +
> static int lan937x_read_table(struct ksz_device *dev, u32 *table)
> {
> int ret;
> @@ -189,6 +288,92 @@ static void lan937x_port_stp_state_set(struct dsa_switch *ds, int port,
> ksz_update_port_member(dev, port);
> }
>
> +static int lan937x_port_vlan_filtering(struct dsa_switch *ds, int port,
> + bool flag,
> + struct netlink_ext_ack *extack)
> +{
> + struct ksz_device *dev = ds->priv;
> +
> + /* enable/disable VLAN mode, once enabled, look up process starts
> + * and then forwarding and discarding are done based on port
> + * membership of the VLAN table
> + */
> + return lan937x_cfg(dev, REG_SW_LUE_CTRL_0, SW_VLAN_ENABLE, flag);
> +}
> +
> +static int lan937x_port_vlan_add(struct dsa_switch *ds, int port,
> + const struct switchdev_obj_port_vlan *vlan,
> + struct netlink_ext_ack *extack)
> +{
> + bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
> + struct ksz_device *dev = ds->priv;
> + struct lan937x_vlan vlan_entry;
> + int ret;
> +
> + ret = lan937x_get_vlan_table(dev, vlan->vid, &vlan_entry);
> + if (ret < 0) {
> + NL_SET_ERR_MSG_MOD(extack, "Failed to get vlan table");
> + return ret;
> + }
> +
> + vlan_entry.fid = lan937x_get_fid(vlan->vid);
> + vlan_entry.valid = true;
> +
> + /* set/clear switch port when updating vlan table registers */
> + if (untagged)
> + vlan_entry.untag_prtmap |= BIT(port);
> + else
> + vlan_entry.untag_prtmap &= ~BIT(port);
> +
> + vlan_entry.fwd_map |= BIT(port);
> +
> + ret = lan937x_set_vlan_table(dev, vlan->vid, &vlan_entry);
> + if (ret < 0) {
> + NL_SET_ERR_MSG_MOD(extack, "Failed to set vlan table");
> + return ret;
> + }
> +
> + /* change PVID */
> + if (vlan->flags & BRIDGE_VLAN_INFO_PVID) {
> + ret = lan937x_pwrite16(dev, port, REG_PORT_DEFAULT_VID,
> + vlan->vid);
> + if (ret < 0) {
> + NL_SET_ERR_MSG_MOD(extack, "Failed to set pvid");
> + return ret;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int lan937x_port_vlan_del(struct dsa_switch *ds, int port,
> + const struct switchdev_obj_port_vlan *vlan)
> +{
> + struct ksz_device *dev = ds->priv;
> + struct lan937x_vlan vlan_entry;
> + u16 pvid;
> + int ret;
> +
> + lan937x_pread16(dev, port, REG_PORT_DEFAULT_VID, &pvid);
Why do you read the pvid here?
> +
> + ret = lan937x_get_vlan_table(dev, vlan->vid, &vlan_entry);
> + if (ret < 0) {
> + dev_err(dev->dev, "Failed to get vlan table\n");
> + return ret;
> + }
> + /* clear port fwd map & untag entries*/
> + vlan_entry.fwd_map &= ~BIT(port);
> + vlan_entry.untag_prtmap &= ~BIT(port);
> +
> + ret = lan937x_set_vlan_table(dev, vlan->vid, &vlan_entry);
> + if (ret < 0) {
> + dev_err(dev->dev, "Failed to set vlan table\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> static int lan937x_port_fdb_add(struct dsa_switch *ds, int port,
> const unsigned char *addr, u16 vid)
> {
> @@ -1036,6 +1221,9 @@ const struct dsa_switch_ops lan937x_switch_ops = {
> .port_bridge_leave = ksz_port_bridge_leave,
> .port_stp_state_set = lan937x_port_stp_state_set,
> .port_fast_age = ksz_port_fast_age,
> + .port_vlan_filtering = lan937x_port_vlan_filtering,
> + .port_vlan_add = lan937x_port_vlan_add,
> + .port_vlan_del = lan937x_port_vlan_del,
> .port_fdb_dump = lan937x_port_fdb_dump,
> .port_fdb_add = lan937x_port_fdb_add,
> .port_fdb_del = lan937x_port_fdb_del,
> --
> 2.27.0
>
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