netdev - Re: [PATCH][net-next v1] gianfar: Add flow control support

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Date:	Mon, 12 Aug 2013 10:08:15 +0300
From:	Claudiu Manoil <claudiu.manoil@...escale.com>
To:	Joe Perches <joe@...ches.com>
CC:	<netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Lutz Jaenicke <ljaenicke@...ominate.com>
Subject: Re: [PATCH][net-next v1] gianfar: Add flow control support

Will provide a static function to factor out the code
that configures the 2 flow control bits for maccfg1.
Thanks.
___
Claudiu

On 8/9/2013 10:09 PM, Joe Perches wrote:
> On Fri, 2013-08-09 at 20:19 +0300, Claudiu Manoil wrote:
>> eTSEC has Rx and Tx flow control capabilities that may be enabled
>> through MACCFG1[Rx_Flow, Tx_Flow] bits.
>
> Trivial note:
>
>> diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
> []
>> @@ -3043,6 +3050,7 @@ static void adjust_link(struct net_device *dev)
> []
>> +		u32 tempval1 = gfar_read(&regs->maccfg1);
> []
>> @@ -3091,6 +3099,32 @@ static void adjust_link(struct net_device *dev)
>>   			priv->oldspeed = phydev->speed;
>>   		}
>>
>> +		tempval1 &= ~(MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
>> +		if (phydev->duplex) {
>> +			if (!priv->pause_aneg_en) {
>> +				if (priv->tx_pause_en)
>> +					tempval1 |= MACCFG1_TX_FLOW;
>> +				if (priv->rx_pause_en)
>> +					tempval1 |= MACCFG1_RX_FLOW;
>> +			} else {
>> +				u8 flowctrl;
>> +				u16 lcl_adv = mii_advertise_flowctrl(
>> +						phydev->advertising);
>> +				u16 rmt_adv = 0;
>> +				if (phydev->pause)
>> +					rmt_adv = LPA_PAUSE_CAP;
>> +				if (phydev->asym_pause)
>> +					rmt_adv |= LPA_PAUSE_ASYM;
>> +				flowctrl = mii_resolve_flowctrl_fdx(
>> +						lcl_adv, rmt_adv);
>> +				if (flowctrl & FLOW_CTRL_TX)
>> +					tempval1 |= MACCFG1_TX_FLOW;
>> +				if (flowctrl & FLOW_CTRL_RX)
>> +					tempval1 |= MACCFG1_RX_FLOW;
>> +			}
>> +		}
>
> I think this bit would be nicer as a static function.
>
> Something like: (uncompiled/untested)
>
> static int gfar_get_cfg1(struct net_device *dev)
> {
> 	struct gfar_private *priv = netdev_priv(dev);
> 	struct gfar __iomem *regs = priv->gfargrp[0].regs;
> 	struct phy_device *phydev = priv->phydev;
> 	int val;
>
> 	val = gfar_read(&regs->maccfg1);
> 	val &= ~(MACCFG1_TX_FLOW | MACCFG1_RX_FLOW);
>
> 	if (!phydev->duplex)
> 		return val;
>
> 	if (!priv->pause_aneg_en) {
> 		if (priv->tx_pause_en)
> 			val |= MACCFG1_TX_FLOW;
> 		if (priv->rx_pause_en)
> 			val |= MACCFG1_RX_FLOW;
> 	} else {
> 		u8 flowctrl;
> 		u16 lcl_adv = mii_advertise_flowctrl(phydev->advertising);
> 		u16 rmt_adv = 0;
> 		if (phydev->pause)
> 			rmt_adv = LPA_PAUSE_CAP;
> 		if (phydev->asym_pause)
> 			rmt_adv |= LPA_PAUSE_ASYM;
> 		flowctrl = mii_resolve_flowctrl_fdx(lcl_adv, rmt_adv);
> 		if (flowctrl & FLOW_CTRL_TX)
> 			val |= MACCFG1_TX_FLOW;
> 		if (flowctrl & FLOW_CTRL_RX)
> 			val |= MACCFG1_RX_FLOW;
> 	}
>
> 	return val;
> }
>


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