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Date:   Sun, 25 Jun 2023 15:09:11 +0300
From:   Vladimir Oltean <olteanv@gmail.com>
To:     Pawel Dembicki <paweldembicki@gmail.com>
Cc:     netdev@vger.kernel.org, Linus Walleij <linus.walleij@linaro.org>,
        Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v2 3/7] net: dsa: vsc73xx: add
 port_stp_state_set function
Message-ID: <20230625120911.ws6eiywonoo5et7b@skbuf>
References: <20230625115343.1603330-1-paweldembicki@gmail.com>
 <20230625115343.1603330-3-paweldembicki@gmail.com>
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On Sun, Jun 25, 2023 at 01:53:38PM +0200, Pawel Dembicki wrote:
> This isn't fully functional implementation of 802.1D, but
> port_stp_state_set is required for future tag8021q operations.
> 
> This implementation handle properly all states, but vsc 73xx don't

handles

vsc73xx doesn't

> forward STP packets.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
> ---
> v2:
>   - fix kdoc
> 
>  drivers/net/dsa/vitesse-vsc73xx-core.c | 51 +++++++++++++++++++++++---
>  drivers/net/dsa/vitesse-vsc73xx.h      |  2 +
>  2 files changed, 47 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
> index 221672b9e17f..f123ce2ed244 100644
> --- a/drivers/net/dsa/vitesse-vsc73xx-core.c
> +++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
> @@ -164,6 +164,10 @@
>  #define VSC73XX_AGENCTRL	0xf0
>  #define VSC73XX_CAPRST		0xff
>  
> +#define VSC73XX_SRCMASKS_CPU_COPY		BIT(27)
> +#define VSC73XX_SRCMASKS_MIRROR			BIT(26)
> +#define VSC73XX_SRCMASKS_PORTS_MASK		GENMASK(7, 0)
> +
>  #define VSC73XX_MACACCESS_CPU_COPY		BIT(14)
>  #define VSC73XX_MACACCESS_FWD_KILL		BIT(13)
>  #define VSC73XX_MACACCESS_IGNORE_VLAN		BIT(12)
> @@ -620,15 +624,17 @@ static int vsc73xx_setup(struct dsa_switch *ds)
>  	vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
>  		      VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
>  		      VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
> -	/* Enable reception of frames on all ports */
> -	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_RECVMASK,
> -		      0x5f);
>  	/* IP multicast flood mask (table 144) */
>  	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_IFLODMSK,
>  		      0xff);
>  
>  	mdelay(50);
>  
> +	/*configure forward map to CPU <-> port only*/
> +	for (i = 0; i < vsc->ds->num_ports; i++)
> +		vsc->forward_map[i] = VSC73XX_SRCMASKS_PORTS_MASK & BIT(CPU_PORT);
> +	vsc->forward_map[CPU_PORT] = VSC73XX_SRCMASKS_PORTS_MASK & ~BIT(CPU_PORT);
> +
>  	/* Release reset from the internal PHYs */
>  	vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GLORESET,
>  		      VSC73XX_GLORESET_PHY_RESET);
> @@ -871,9 +877,6 @@ static void vsc73xx_phylink_mac_link_up(struct dsa_switch *ds, int port,
>  	if (duplex == DUPLEX_FULL)
>  		val |= VSC73XX_MAC_CFG_FDX;
>  
> -	/* Enable port (forwarding) in the receieve mask */
> -	vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> -			    VSC73XX_RECVMASK, BIT(port), BIT(port));
>  	vsc73xx_adjust_enable_port(vsc, port, val);
>  }
>  
> @@ -1040,6 +1043,41 @@ static int vsc73xx_get_max_mtu(struct dsa_switch *ds, int port)
>  	return 9600;
>  }
>  
> +static void vsc73xx_port_stp_state_set(struct dsa_switch *ds, int port,
> +				       u8 state)
> +{
> +	struct vsc73xx *vsc = ds->priv;

Blank link after variable declarations; this affects comments too.
You can either put that comment above the function, or right above the
first "if" block (to me it makes more sense above the function).

> +	/* FIXME: STP frames isn't forwarded at this moment. BPDU frames are

s/isn't/aren't/

> +	 * forwarded only from to PI/SI interface. For more info see chapter

s/from to/from and to/

> +	 * 2.7.1 (CPU Forwarding) in datasheet.
> +	 * This function is required for tag8021q operations.
> +	 */
> +
> +	if (state == BR_STATE_BLOCKING)

state == BR_STATE_BLOCKING || state == BR_STATE_DISABLED

> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_RECVMASK, BIT(port), 0);
> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_RECVMASK, BIT(port), BIT(port));
> +
> +	if (state == BR_STATE_LEARNING || state == BR_STATE_FORWARDING)
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_LEARNMASK, BIT(port), BIT(port));
> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_LEARNMASK, BIT(port), 0);
> +
> +	if (state == BR_STATE_FORWARDING)
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_SRCMASKS + port,
> +				    VSC73XX_SRCMASKS_PORTS_MASK,
> +				    vsc->forward_map[port]);
> +	else
> +		vsc73xx_update_bits(vsc, VSC73XX_BLOCK_ANALYZER, 0,
> +				    VSC73XX_SRCMASKS + port,
> +				    VSC73XX_SRCMASKS_PORTS_MASK, 0);
> +}
> +
>  static const struct dsa_switch_ops vsc73xx_ds_ops = {
>  	.get_tag_protocol = vsc73xx_get_tag_protocol,
>  	.setup = vsc73xx_setup,
> @@ -1056,6 +1094,7 @@ 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_stp_state_set = vsc73xx_port_stp_state_set,
>  };
>  
>  static int vsc73xx_gpio_get(struct gpio_chip *chip, unsigned int offset)
> diff --git a/drivers/net/dsa/vitesse-vsc73xx.h b/drivers/net/dsa/vitesse-vsc73xx.h
> index 30b1f0a36566..c4d5398edeeb 100644
> --- a/drivers/net/dsa/vitesse-vsc73xx.h
> +++ b/drivers/net/dsa/vitesse-vsc73xx.h
> @@ -5,6 +5,7 @@
>  
>  /**
>   * struct vsc73xx - VSC73xx state container
> + * @forward_map: Forward table cache
>   */
>  struct vsc73xx {
>  	struct device			*dev;
> @@ -15,6 +16,7 @@ struct vsc73xx {
>  	u8				addr[ETH_ALEN];
>  	const struct vsc73xx_ops	*ops;
>  	void				*priv;
> +	u8				forward_map[8];

Can we have this 8 and the one from the vsc->ds->num_ports assignment
consolidated into a single macro, VSC73XX_MAX_NUM_PORTS?

>  };
>  
>  struct vsc73xx_ops {
> -- 
> 2.34.1
>