netdev - Re: [PATCH 1/1] drivers: net: cpsw: add support to show hw stats via ethtool

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Date:	Tue, 23 Jul 2013 14:21:56 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH 1/1] drivers: net: cpsw: add support to show hw stats
 via ethtool

On 7/22/2013 10:35 PM, Ben Hutchings wrote:
> On Mon, 2013-07-22 at 14:07 +0530, Mugunthan V N wrote:
>> Add support to show CPSW hardware statistics to user via ethtool
>> so user can find if there were any error reported by hardware or
>> the system is over loaded duing high data rate transfer.
>>
>> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
>> ---
>>  drivers/net/ethernet/ti/cpsw.c | 202 ++++++++++++++++++++++++++++++++++++++++-
>>  1 file changed, 200 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
>> index 05a1674..f344c05 100644
>> --- a/drivers/net/ethernet/ti/cpsw.c
>> +++ b/drivers/net/ethernet/ti/cpsw.c
> [...]
>> +static const struct cpsw_stats cpsw_gstrings_stats[] = {
>> +	{ "Good Rx Frames", CPSW_STAT(rxgoodframes) },
>> +	{ "Broadcast Rx Frames", CPSW_STAT(rxbroadcastframes) },
>> +	{ "Multicast Rx Frames", CPSW_STAT(rxmulticastframes) },
>> +	{ "Pause Rx Frames", CPSW_STAT(rxpauseframes) },
>> +	{ "Rx CRC Errors", CPSW_STAT(rxcrcerrors) },
> [...]
>
> Statistic names usually don't contain spaces, though I can accept this
> is probably more readable.
>
>> +static void cpsw_get_ethtool_stats(struct net_device *ndev,
>> +				    struct ethtool_stats *stats, u64 *data)
>> +{
>> +	struct cpsw_priv *priv = netdev_priv(ndev);
>> +	struct cpdma_chan_stats rx_stats;
>> +	struct cpdma_chan_stats tx_stats;
>> +	u32 val;
>> +	u8 *p;
>> +	int i;
>> +
>> +	/* Collect Davinci CPDMA stats for Rx and Tx Channel */
>> +	cpdma_chan_get_stats(priv->rxch, &rx_stats);
>> +	cpdma_chan_get_stats(priv->txch, &tx_stats);
>> +
>> +	for (i = 0; i < CPSW_STATS_LEN; i++) {
>> +		switch (cpsw_gstrings_stats[i].type) {
>> +		case CPSW_STATS:
>> +			val = readl((u8 *)priv->hw_stats +
> Shouldn't this cast use 'u8 __iomem *'?
Yes, will change this in v2 and submit it.

Regards
Mugunthan V N
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