netdev - Re: [PATCH v6 net-next 14/19] ionic: Add initial ethtool support

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Message-ID: <4c140c92-38b7-7c81-2a82-d23df8d16252@pensando.io>
Date:   Fri, 30 Aug 2019 14:25:12 -0700
From:   Shannon Nelson <snelson@...sando.io>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH v6 net-next 14/19] ionic: Add initial ethtool support

On 8/29/19 4:10 PM, Jakub Kicinski wrote:
> On Thu, 29 Aug 2019 11:27:15 -0700, Shannon Nelson wrote:
>> +static int ionic_get_module_eeprom(struct net_device *netdev,
>> +				   struct ethtool_eeprom *ee,
>> +				   u8 *data)
>> +{
>> +	struct ionic_lif *lif = netdev_priv(netdev);
>> +	struct ionic_dev *idev = &lif->ionic->idev;
>> +	struct ionic_xcvr_status *xcvr;
>> +	char tbuf[sizeof(xcvr->sprom)];
>> +	int count = 10;
>> +	u32 len;
>> +
>> +	/* The NIC keeps the module prom up-to-date in the DMA space
>> +	 * so we can simply copy the module bytes into the data buffer.
>> +	 */
>> +	xcvr = &idev->port_info->status.xcvr;
>> +	len = min_t(u32, sizeof(xcvr->sprom), ee->len);
>> +
>> +	do {
>> +		memcpy(data, xcvr->sprom, len);
>> +		memcpy(tbuf, xcvr->sprom, len);
>> +
>> +		/* Let's make sure we got a consistent copy */
>> +		if (!memcmp(data, tbuf, len))
>> +			break;
>> +
>> +	} while (--count);
> Should this return an error if the image was never consistent?

Sure, how about -EBUSY?

sln