Re: [PATCH net-next] net: dsa: rtl8366rb: support bridge offloading

Vladimir Oltean
2021-03-15T21:50:25Z

On Tue, Mar 16, 2021 at 01:01:44AM +0800, LGA1150 wrote:
> From: DENG Qingfang <dqfext@gmail.com>
>
> Use port isolation registers to configure bridge offloading.
> Remove the VLAN init, as we have proper CPU tag and bridge offloading
> support now.
>
> Signed-off-by: DENG Qingfang <dqfext@gmail.com>
> ---
> Changes since RFC:
> Fix build error
>
> drivers/net/dsa/rtl8366rb.c | 71 +++++++++++++++++++++++++++++++++----
> 1 file changed, 65 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/dsa/rtl8366rb.c b/drivers/net/dsa/rtl8366rb.c
> index a89093bc6c6a..bbcfdd84f0e9 100644
> --- a/drivers/net/dsa/rtl8366rb.c
> +++ b/drivers/net/dsa/rtl8366rb.c
> @@ -300,6 +300,12 @@
> #define RTL8366RB_INTERRUPT_STATUS_REG 0x0442
> #define RTL8366RB_NUM_INTERRUPT 14 /* 0..13 */
>
> +/* Port isolation registers */
> +#define RTL8366RB_PORT_ISO_BASE 0x0F08
> +#define RTL8366RB_PORT_ISO(pnum) (RTL8366RB_PORT_ISO_BASE + (pnum))
> +#define RTL8366RB_PORT_ISO_EN BIT(0)
> +#define RTL8366RB_PORT_ISO_PORTS_MASK GENMASK(7, 1)
> +
> /* bits 0..5 enable force when cleared */
> #define RTL8366RB_MAC_FORCE_CTRL_REG 0x0F11
>
> @@ -835,6 +841,15 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
> if (ret)
> return ret;
>
> + /* Isolate user ports */
> + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
> + ret = regmap_write(smi->map, RTL8366RB_PORT_ISO(i),
> + RTL8366RB_PORT_ISO_EN |
> + BIT(RTL8366RB_PORT_NUM_CPU + 1));

You have a RTL8366RB_PORT_ISO_PORTS_MASK that you don't use, and you
open-code a +1 here and everywhere below. Wouldn't it be more useful to
have a macro for RTL8366RB_PORT_ISO_PORTS(mask)?

> + if (ret)
> + return ret;
> + }
> +
> /* Set up the "green ethernet" feature */
> ret = rtl8366rb_jam_table(rtl8366rb_green_jam,
> ARRAY_SIZE(rtl8366rb_green_jam), smi, false);
> @@ -963,10 +978,6 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
> return ret;
> }
>
> - ret = rtl8366_init_vlan(smi);
> - if (ret)
> - return ret;
> -

You can actually delete rtl8366_init_vlan now, it is unused.

> ret = rtl8366rb_setup_cascaded_irq(smi);
> if (ret)
> dev_info(smi->dev, "no interrupt support\n");
> @@ -977,8 +988,6 @@ static int rtl8366rb_setup(struct dsa_switch *ds)
> return -ENODEV;
> }
>
> - ds->configure_vlan_while_not_filtering = false;
> -
> return 0;
> }
>
> @@ -1127,6 +1136,54 @@ rtl8366rb_port_disable(struct dsa_switch *ds, int port)
> rb8366rb_set_port_led(smi, port, false);
> }
>
> +static int
> +rtl8366rb_port_bridge_join(struct dsa_switch *ds, int port,
> + struct net_device *bridge)
> +{
> + struct realtek_smi *smi = ds->priv;
> + unsigned int port_bitmap = 0;
> + int ret, i;
> +
> + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {

Could you use ds->num_ports please?

> + if (i == port)
> + continue;
> + if (dsa_to_port(ds, i)->bridge_dev != bridge)
> + continue;
> + ret = regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i),
> + 0, BIT(port + 1));

You call regmap_update_bits with a mask of 0? What does it mean?
This is tested, right?

> + if (ret)
> + return ret;
> +
> + port_bitmap |= BIT(i);
> + }
> +
> + return regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port),
> + 0, port_bitmap << 1);
> +}
> +
> +static void
> +rtl8366rb_port_bridge_leave(struct dsa_switch *ds, int port,
> + struct net_device *bridge)
> +{
> + struct realtek_smi *smi = ds->priv;
> + unsigned int port_bitmap = 0;
> + int i;
> +
> + for (i = 0; i < RTL8366RB_PORT_NUM_CPU; i++) {
> + if (i == port)
> + continue;
> + if (dsa_to_port(ds, i)->bridge_dev != bridge)
> + continue;
> + regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(i),
> + BIT(port + 1), 0);
> +
> + port_bitmap |= BIT(i);
> + }
> +
> + regmap_update_bits(smi->map, RTL8366RB_PORT_ISO(port),
> + port_bitmap << 1, 0);
> +}
> +