netdev - Re: [PATCHv2 net-next 1/4] net: dsa: mv88e6xxx: Implement mv88e6390 tag remap

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Date:   Fri, 02 Dec 2016 14:15:37 -0500
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Andrew Lunn <andrew@...n.ch>, David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCHv2 net-next 1/4] net: dsa: mv88e6xxx: Implement mv88e6390 tag remap

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> +/* Offset 0x18: Port IEEE Priority Remapping Registers [0-3]
> + * Offset 0x19: Port IEEE Priority Remapping Registers [4-7]
> + */
> +
> +int mv88e6095_port_tag_remap(struct mv88e6xxx_chip *chip, int port)
> +{
> +	int err;
> +
> +	/* Use a direct priority mapping for all IEEE tagged frames */
> +	err = mv88e6xxx_port_write(chip, port, PORT_TAG_REGMAP_0123, 0x3210);
> +	if (err)
> +		return err;
> +
> +	return mv88e6xxx_port_write(chip, port, PORT_TAG_REGMAP_4567, 0x7654);
> +}
> +
> +static int mv88e6xxx_port_ieeepmt_write(struct mv88e6xxx_chip *chip,
> +					int port, u16 table,
> +					u8 pointer, u16 data)
> +{
> +	u16 reg;
> +
> +	reg = PORT_IEEE_PRIO_MAP_TABLE_UPDATE |
> +		table |
> +		(pointer << PORT_IEEE_PRIO_MAP_TABLE_POINTER_SHIFT) |
> +		data;
> +
> +	return mv88e6xxx_port_write(chip, port, PORT_IEEE_PRIO_MAP_TABLE, reg);
> +}
> +

I'll send a delta patch to introduce mv88e6xxx_port_update() so we'll
benefit from the free wait on update bit 15.

> +int mv88e6390_port_tag_remap(struct mv88e6xxx_chip *chip, int port)
> +{
> +	int err, i;
> +
> +	for (i = 0; i <= 7; i++) {
> +		err = mv88e6xxx_port_ieeepmt_write(
> +			chip, port, PORT_IEEE_PRIO_MAP_TABLE_INGRESS_PCP,
> +			i, (i | i << 4));

So here you are also mapping the frame's IEEE QPRI (offset 4), this is a
bit inconsistent compared to mv88e6095_port_tag_remap, which doesn't.

But it seems like these functions are only used at the moment to write
the default values, so I guess it doesn't really matter right now...

> +		if (err)
> +			return err;
> +
> +		err = mv88e6xxx_port_ieeepmt_write(
> +			chip, port, PORT_IEEE_PRIO_MAP_TABLE_EGRESS_GREEN_PCP,
> +			i, i);
> +		if (err)
> +			return err;
> +
> +		err = mv88e6xxx_port_ieeepmt_write(
> +			chip, port, PORT_IEEE_PRIO_MAP_TABLE_EGRESS_YELLOW_PCP,
> +			i, i);
> +		if (err)
> +			return err;
> +
> +		err = mv88e6xxx_port_ieeepmt_write(
> +			chip, port, PORT_IEEE_PRIO_MAP_TABLE_EGRESS_AVB_PCP,
> +			i, i);
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}

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

Thanks,

        Vivien