netdev - Re: [PATCH net-next v3 6/8] net: pcs: Add 10GBASE-R mode for Synopsys Designware XPCS

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Message-ID: <20230419131938.3k4kuqucvuuhxcrc@skbuf>
Date:   Wed, 19 Apr 2023 16:19:38 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jiawen Wu <jiawenwu@...stnetic.com>
Cc:     netdev@...r.kernel.org, linux@...linux.org.uk,
        linux-i2c@...r.kernel.org, linux-gpio@...r.kernel.org,
        mengyuanlou@...-swift.com, Jose Abreu <Jose.Abreu@...opsys.com>
Subject: Re: [PATCH net-next v3 6/8] net: pcs: Add 10GBASE-R mode for
 Synopsys Designware XPCS

On Wed, Apr 19, 2023 at 04:27:37PM +0800, Jiawen Wu wrote:
> Add basic support for XPCS using 10GBASE-R interface. This mode will
> be extended to use interrupt, so set pcs.poll false. And avoid soft
> reset so that the device using this mode is in the default configuration.

I'm not clear why the xpcs_soft_reset() call is avoided. Isn't the
out-of-reset configuration the "default" one?

> +static int xpcs_get_state_10gbaser(struct dw_xpcs *xpcs,
> +				   struct phylink_link_state *state)
> +{
> +	int ret;
> +
> +	state->link = false;
> +
> +	ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_STAT1);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ret & MDIO_STAT1_LSTATUS)
> +		state->link = true;
> +
> +	if (state->link) {

It seems pointless to open a new "if" statement when this would have
sufficed:

	if (ret & MDIO_STAT1_LSTATUS) {
		state->link = true;
		state->pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
		...
	}

> +		state->pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
> +		state->duplex = DUPLEX_FULL;
> +		state->speed = SPEED_10000;
> +	}
> +
> +	return 0;
> +}