Re: [PATCH v7 net-next 4/5] net: ena: PHC stats through sysfs

[Jakub Kicinski <kuba@kernel.org>]

On Tue, 18 Feb 2025 20:39:47 +0200 David Arinzon wrote:
> +static ssize_t ena_phc_stats_show(struct device *dev,
> +				  struct device_attribute *attr,
> +				  char *buf)
> +{
> +	struct ena_adapter *adapter = dev_get_drvdata(dev);
> +	int i, rc, chars_written = 0;
> +
> +	if (!ena_phc_is_active(adapter))
> +		return 0;
> +
> +	for (i = 0; i < ena_stats_array_ena_com_phc_size; i++) {
> +		const struct ena_stats *ena_stats;
> +		u64 *ptr;
> +
> +		ena_stats = &ena_stats_ena_com_phc_strings[i];
> +		ptr = (u64 *)&adapter->ena_dev->phc.stats +
> +		      ena_stats->stat_offset;
> +		rc = snprintf(buf,
> +			      ETH_GSTRING_LEN + sizeof(u64),
> +			      "%s: %llu\n",
> +			      ena_stats->name,
> +			      *ptr);
> +
> +		buf += rc;
> +		chars_written += rc;
> +	}
> +
> +	return chars_written;
> +}
> +
> +static DEVICE_ATTR(phc_stats, S_IRUGO, ena_phc_stats_show, NULL);

In sysfs I'm afraid the rule is one value per file.
So the stats have to have individual files.
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