netdev - Re: [PATCH net-next v4 09/11] net: dsa: realtek: rtl8365mb: use DSA CPU port

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Date:   Mon, 10 Jan 2022 13:22:38 +0000
From:   Alvin Šipraga <ALSI@...g-olufsen.dk>
To:     Luiz Angelo Daros de Luca <luizluca@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "olteanv@...il.com" <olteanv@...il.com>,
        "arinc.unal@...nc9.com" <arinc.unal@...nc9.com>,
        "frank-w@...lic-files.de" <frank-w@...lic-files.de>
Subject: Re: [PATCH net-next v4 09/11] net: dsa: realtek: rtl8365mb: use DSA
 CPU port

Luiz Angelo Daros de Luca <luizluca@...il.com> writes:

> Instead of a fixed CPU port, assume that DSA is correct.
>
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
> Tested-by: Arınç ÜNAL <arinc.unal@...nc9.com>

With the warning fixed:

Reviewed-by: Alvin Šipraga <alsi@...g-olufsen.dk>

> ---
>  drivers/net/dsa/realtek/rtl8365mb.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
> index b22f50a9d1ef..adc72f0844ae 100644
> --- a/drivers/net/dsa/realtek/rtl8365mb.c
> +++ b/drivers/net/dsa/realtek/rtl8365mb.c
> @@ -103,14 +103,13 @@
>  
>  /* Chip-specific data and limits */
>  #define RTL8365MB_CHIP_ID_8365MB_VC		0x6367
> -#define RTL8365MB_CPU_PORT_NUM_8365MB_VC	6
>  #define RTL8365MB_LEARN_LIMIT_MAX_8365MB_VC	2112
>  
>  /* Family-specific data and limits */
>  #define RTL8365MB_PHYADDRMAX	7
>  #define RTL8365MB_NUM_PHYREGS	32
>  #define RTL8365MB_PHYREGMAX	(RTL8365MB_NUM_PHYREGS - 1)
> -#define RTL8365MB_MAX_NUM_PORTS	(RTL8365MB_CPU_PORT_NUM_8365MB_VC + 1)
> +#define RTL8365MB_MAX_NUM_PORTS  7
>  
>  /* Chip identification registers */
>  #define RTL8365MB_CHIP_ID_REG		0x1300
> @@ -1806,6 +1805,8 @@ static int rtl8365mb_reset_chip(struct realtek_priv *priv)
>  static int rtl8365mb_setup(struct dsa_switch *ds)
>  {
>  	struct realtek_priv *priv = ds->priv;
> +	struct rtl8365mb_cpu cpu;

Unused?

> +	struct dsa_port *cpu_dp;
>  	struct rtl8365mb *mb;
>  	int ret;
>  	int i;
> @@ -1833,9 +1834,16 @@ static int rtl8365mb_setup(struct dsa_switch *ds)
>  		dev_info(priv->dev, "no interrupt support\n");
>  
>  	/* Configure CPU tagging */
> -	ret = rtl8365mb_cpu_config(priv);
> -	if (ret)
> -		goto out_teardown_irq;
> +	dsa_switch_for_each_cpu_port(cpu_dp, priv->ds) {
> +		priv->cpu_port = cpu_dp->index;
> +		mb->cpu.mask = BIT(priv->cpu_port);
> +		mb->cpu.trap_port = priv->cpu_port;
> +		ret = rtl8365mb_cpu_config(priv);
> +		if (ret)
> +			goto out_teardown_irq;
> +
> +		break;

Maybe a comment like /* Currently, only one CPU port is supported */?

> +	}
>  
>  	/* Configure ports */
>  	for (i = 0; i < priv->num_ports; i++) {
> @@ -1967,8 +1975,7 @@ static int rtl8365mb_detect(struct realtek_priv *priv)
>  			 "found an RTL8365MB-VC switch (ver=0x%04x)\n",
>  			 chip_ver);
>  
> -		priv->cpu_port = RTL8365MB_CPU_PORT_NUM_8365MB_VC;
> -		priv->num_ports = priv->cpu_port + 1;
> +		priv->num_ports = RTL8365MB_MAX_NUM_PORTS;
>  
>  		mb->priv = priv;
>  		mb->chip_id = chip_id;
> @@ -1979,8 +1986,6 @@ static int rtl8365mb_detect(struct realtek_priv *priv)
>  		mb->jam_size = ARRAY_SIZE(rtl8365mb_init_jam_8365mb_vc);
>  
>  		mb->cpu.enable = 1;
> -		mb->cpu.mask = BIT(priv->cpu_port);
> -		mb->cpu.trap_port = priv->cpu_port;
>  		mb->cpu.insert = RTL8365MB_CPU_INSERT_TO_ALL;
>  		mb->cpu.position = RTL8365MB_CPU_POS_AFTER_SA;
>  		mb->cpu.rx_length = RTL8365MB_CPU_RXLEN_64BYTES;