quoted

+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.
--
pw-bot: cr

Thanks Jakub, will change  in v8.