netdev - Re: [PATCH net-next 2/2] net: dsa: lan9303: Add basic offloading of unicast traffic

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Date:   Thu, 21 Sep 2017 10:26:54 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Egil Hjelmeland <privat@...l-hjelmeland.no>, andrew@...n.ch,
        f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Egil Hjelmeland <privat@...l-hjelmeland.no>
Subject: Re: [PATCH net-next 2/2] net: dsa: lan9303: Add basic offloading of unicast traffic

Hi Egil,

Egil Hjelmeland <privat@...l-hjelmeland.no> writes:

> When both user ports are joined to the same bridge, the normal
> HW MAC learning is enabled. This means that unicast traffic is forwarded
> in HW.
>
> If one of the user ports leave the bridge,
> the ports goes back to the initial separated operation.
>
> Port separation relies on disabled HW MAC learning. Hence the condition
> that both ports must join same bridge.
>
> Add brigde methods port_bridge_join, port_bridge_leave and
> port_stp_state_set.
>
> Signed-off-by: Egil Hjelmeland <privat@...l-hjelmeland.no>

Styling nitpicks below, other than that, the patch LGTM:

Reviewed-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

>  #include <linux/mutex.h>
>  #include <linux/mii.h>
>  #include <linux/phy.h>
> +#include <linux/if_bridge.h>

It's nice to order header inclusions alphabetically.

>  
>  #include "lan9303.h"
>  
> @@ -146,6 +147,7 @@
>  # define LAN9303_SWE_PORT_STATE_FORWARDING_PORT0 (0)
>  # define LAN9303_SWE_PORT_STATE_LEARNING_PORT0 BIT(1)
>  # define LAN9303_SWE_PORT_STATE_BLOCKING_PORT0 BIT(0)
> +# define LAN9303_SWE_PORT_STATE_DISABLED_PORT0 (3)
>  #define LAN9303_SWE_PORT_MIRROR 0x1846
>  # define LAN9303_SWE_PORT_MIRROR_SNIFF_ALL BIT(8)
>  # define LAN9303_SWE_PORT_MIRROR_SNIFFER_PORT2 BIT(7)
> @@ -431,6 +433,20 @@ static int lan9303_read_switch_reg(struct lan9303 *chip, u16 regnum, u32 *val)
>  	return ret;
>  }
>  
> +static int lan9303_write_switch_reg_mask(
> +	struct lan9303 *chip, u16 regnum, u32 val, u32 mask)

That is unlikely to respect the Kernel Coding Style. Please fill the
line as much as possible and align with the opening parenthesis:

    static int lan9303_write_switch_reg_mask(struct lan9303 *chip, u16 regnum,
                                             u32 val, u32 mask)

> +{
> +	int ret;
> +	u32 reg;
> +
> +	ret = lan9303_read_switch_reg(chip, regnum, &reg);
> +	if (ret)
> +		return ret;
> +	reg = (reg & ~mask) | val;
> +
> +	return lan9303_write_switch_reg(chip, regnum, reg);
> +}

...

> +
> +	portmask = 0x3 << (port * 2);
> +	portstate     <<= (port * 2);

Unnecessary alignment, please remove the extra space characters.

> +	lan9303_write_switch_reg_mask(chip, LAN9303_SWE_PORT_STATE,
> +				      portstate, portmask);
> +}
> +
>  static const struct dsa_switch_ops lan9303_switch_ops = {
>  	.get_tag_protocol = lan9303_get_tag_protocol,
>  	.setup = lan9303_setup,
> @@ -855,6 +940,9 @@ static const struct dsa_switch_ops lan9303_switch_ops = {
>  	.get_sset_count = lan9303_get_sset_count,
>  	.port_enable = lan9303_port_enable,
>  	.port_disable = lan9303_port_disable,
> +	.port_bridge_join       = lan9303_port_bridge_join,
> +	.port_bridge_leave      = lan9303_port_bridge_leave,
> +	.port_stp_state_set     = lan9303_port_stp_state_set,

Same here, alignment unnecessary, especially since the rest of the
structure does not do that.

>  };
>  
>  static int lan9303_register_switch(struct lan9303 *chip)
> diff --git a/drivers/net/dsa/lan9303.h b/drivers/net/dsa/lan9303.h
> index 4d8be555ff4d..5be246f05965 100644
> --- a/drivers/net/dsa/lan9303.h
> +++ b/drivers/net/dsa/lan9303.h
> @@ -21,6 +21,7 @@ struct lan9303 {
>  	struct dsa_switch *ds;
>  	struct mutex indirect_mutex; /* protect indexed register access */
>  	const struct lan9303_phy_ops *ops;
> +	bool is_bridged; /* true if port 1 and 2 is bridged */
>  };
>  
>  extern const struct regmap_access_table lan9303_register_set;

Please use the checkpatch.pl script to ensure your patch respects the
kernel conventions before submitting, it can spot nice stuffs!

I use a Git alias(*) to check a commit which does basically this:

    git format-patch --stdout -1 | ./scripts/checkpatch.pl -


(*) in details, especially convenient during interactive rebases:

    $ git config alias.checkcommit '!f () { git format-patch --stdout -1 ${1:-HEAD} | ./scripts/checkpatch.pl - ; }; f'
    $ git checkcommit # i.e. current one
    $ git checkcommit HEAD^^
    $ git checkcommit d329ac88eb21
    ...


Thanks,

        Vivien