[dpdk-dev] [PATCH v1] ethdev: fix xstats id mismatch

[Remy Horton]

When fetching xstats values the driver specific parameters are
placed after the generic ones, but when fetching xstats names
the driver specific parameter names came first. This patch fixes
the resulting id mismatch between names and values.

Fixes: bd6aa172cf35 ("ethdev: fetch extended statistics with integer ids")

Signed-off-by: Remy Horton <remy.horton at intel.com>
---
 lib/librte_ether/rte_ethdev.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index eac260f..80b4d90 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1536,6 +1536,7 @@ rte_eth_xstats_get_names(uint8_t port_id,
 	struct rte_eth_dev *dev;
 	int cnt_used_entries;
 	int cnt_expected_entries;
+	int cnt_driver_entries;
 	uint32_t idx, id_queue;
 
 	cnt_expected_entries = get_xstats_count(port_id);
@@ -1545,16 +1546,7 @@ rte_eth_xstats_get_names(uint8_t port_id,
 
 	/* port_id checked in get_xstats_count() */
 	dev = &rte_eth_devices[port_id];
-	if (dev->dev_ops->xstats_get_names != NULL) {
-		cnt_used_entries = (*dev->dev_ops->xstats_get_names)(
-			dev, xstats_names, size);
-		if (cnt_used_entries < 0)
-			return cnt_used_entries;
-	} else
-		/* Driver itself does not support extended stats, but
-		 * still have basic stats.
-		 */
-		cnt_used_entries = 0;
+	cnt_used_entries = 0;
 
 	for (idx = 0; idx < RTE_NB_STATS; idx++) {
 		snprintf(xstats_names[cnt_used_entries].name,
@@ -1581,6 +1573,20 @@ rte_eth_xstats_get_names(uint8_t port_id,
 			cnt_used_entries++;
 		}
 	}
+
+	if (dev->dev_ops->xstats_get_names != NULL) {
+		/* If there are any driver-specific xstats, append them
+		 * to end of list.
+		 */
+		cnt_driver_entries = (*dev->dev_ops->xstats_get_names)(
+			dev,
+			xstats_names + cnt_used_entries,
+			size - cnt_used_entries);
+		if (cnt_driver_entries < 0)
+			return cnt_driver_entries;
+		cnt_used_entries += cnt_driver_entries;
+	}
+
 	return cnt_used_entries;
 }
 
@@ -1628,7 +1634,6 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 		stats_ptr = RTE_PTR_ADD(&eth_stats,
 					rte_stats_strings[i].offset);
 		val = *stats_ptr;
-		xstats[count].id = count + xcount;
 		xstats[count++].value = val;
 	}
 
@@ -1639,7 +1644,6 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 					rte_rxq_stats_strings[i].offset +
 					q * sizeof(uint64_t));
 			val = *stats_ptr;
-			xstats[count].id = count + xcount;
 			xstats[count++].value = val;
 		}
 	}
@@ -1651,11 +1655,13 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 					rte_txq_stats_strings[i].offset +
 					q * sizeof(uint64_t));
 			val = *stats_ptr;
-			xstats[count].id = count + xcount;
 			xstats[count++].value = val;
 		}
 	}
 
+	for (i = 0; i < count + xcount; i++)
+		xstats[i].id = i;
+
 	return count + xcount;
 }
 
-- 
2.5.5