Re: [PATCH v2 09/10] net/macb: ethtool interface: add register dump feature

From: Ben Hutchings <bhutchings@solarflare.com>
To: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: <netdev@vger.kernel.org>, <davem@davemloft.net>,
	<linux-arm-kernel@lists.infradead.org>, <havard@skinnemoen.net>,
	<plagnioj@jcrosoft.com>, <patrice.vilchez@atmel.com>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 09/10] net/macb: ethtool interface: add register dump feature
Date: Thu, 6 Sep 2012 15:34:44 +0100	[thread overview]
Message-ID: <1346942084.17321.22.camel@deadeye.wl.decadent.org.uk> (raw)
In-Reply-To: <1346941256-15676-1-git-send-email-nicolas.ferre@atmel.com>

On Thu, 2012-09-06 at 16:20 +0200, Nicolas Ferre wrote:
> Add macb_get_regs() ethtool function and its helper function:
> macb_get_regs_len().
> The version field is deduced from the IP revision which gives the
> "MACB or GEM" information. An additional version field is reserved.
> 
> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com>
> ---
> v2: - modify MACB_GREGS_NBR name and adapt to number of registers
>       actually displayed.
>     - change version format to reflect register layout and
>       add a version number to be future proof.
> 
>  drivers/net/ethernet/cadence/macb.c |   40 +++++++++++++++++++++++++++++++++++
>  drivers/net/ethernet/cadence/macb.h |    3 +++
>  2 files changed, 43 insertions(+)
> 
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index dc34ff1..cab42e7 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -1223,9 +1223,49 @@ static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
>  	return phy_ethtool_sset(phydev, cmd);
>  }
>  
> +static int macb_get_regs_len(struct net_device *netdev)
> +{
> +	return MACB_GREGS_NBR * sizeof(u32);
> +}
> +
> +static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
> +			  void *p)
> +{
> +	struct macb *bp = netdev_priv(dev);
> +	unsigned int tail, head;
> +	u32 *regs_buff = p;
> +
> +	regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
> +			| MACB_GREGS_VERSION;
> +
> +	tail = macb_tx_ring_wrap(bp->tx_tail);
> +	head = macb_tx_ring_wrap(bp->tx_head);
> +
> +	regs_buff[0]  = macb_readl(bp, NCR);
> +	regs_buff[1]  = macb_or_gem_readl(bp, NCFGR);
> +	regs_buff[2]  = macb_readl(bp, NSR);
> +	regs_buff[3]  = macb_readl(bp, TSR);
> +	regs_buff[4]  = macb_readl(bp, RBQP);
> +	regs_buff[5]  = macb_readl(bp, TBQP);
> +	regs_buff[6]  = macb_readl(bp, RSR);
> +	regs_buff[7]  = macb_readl(bp, IMR);
> +
> +	regs_buff[8]  = tail;
> +	regs_buff[9]  = head;
> +	regs_buff[10] = macb_tx_dma(bp, tail);
> +	regs_buff[11] = macb_tx_dma(bp, head);
> +
> +	if (macb_is_gem(bp)) {
> +		regs_buff[12] = gem_readl(bp, USRIO);
> +		regs_buff[13] = gem_readl(bp, DMACFG);
> +	}
> +}
> +
>  static const struct ethtool_ops macb_ethtool_ops = {
>  	.get_settings		= macb_get_settings,
>  	.set_settings		= macb_set_settings,
> +	.get_regs_len		= macb_get_regs_len,
> +	.get_regs		= macb_get_regs,
>  	.get_link		= ethtool_op_get_link,
>  };
>  
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index f69ceef..bcadc3c 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -10,6 +10,9 @@
>  #ifndef _MACB_H
>  #define _MACB_H
>  
> +#define MACB_GREGS_NBR 16
> +#define MACB_GREGS_VERSION 1
> +
>  /* MACB register offsets */
>  #define MACB_NCR				0x0000
>  #define MACB_NCFGR				0x0004

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.