[dpdk-stable] patch 'ethdev: check maximum number of queues for statistics' has been queued to stable release 16.11.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 16.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable
yet. It will be pushed if I get no objections before 01/28/17.
So please shout if anyone has objections.

---

Note 16.11 is a LTS release. v16.11.1 is planned to be released
shortly (about 2-3 weeks) after v17.02.

---

Thanks.

	--yliu

---
>From 808e1b2ef8861187bb1e503ddeb6de6174d2bf32 Mon Sep 17 00:00:00 2001
From: Bert van Leeuwen <bert.vanleeuwen at netronome.com>
Date: Mon, 21 Nov 2016 09:59:38 +0000
Subject: [PATCH] ethdev: check maximum number of queues for statistics

[ upstream commit e0ccf3380039357274237a3123bba9fa01d3127c ]

Arrays inside rte_eth_stats have size=RTE_ETHDEV_QUEUE_STAT_CNTRS.
Some devices report more queues than that and this code blindly uses
the reported number of queues by the device to fill those arrays up.
This patch fixes the problem using MIN between the reported number of
queues and RTE_ETHDEV_QUEUE_STAT_CNTRS.

Fixes: ce757f5c9a4d ("ethdev: new method to retrieve extended statistics")

Signed-off-by: Alejandro Lucero <alejandro.lucero at netronome.com>
Reviewed-by: Olivier Matz <olivier.matz at 6wind.com>
---
 lib/librte_ether/rte_ethdev.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index fde8112..4209ad0 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -1343,8 +1343,10 @@ get_xstats_count(uint8_t port_id)
 	} else
 		count = 0;
 	count += RTE_NB_STATS;
-	count += dev->data->nb_rx_queues * RTE_NB_RXQ_STATS;
-	count += dev->data->nb_tx_queues * RTE_NB_TXQ_STATS;
+	count += RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
+		 RTE_NB_RXQ_STATS;
+	count += RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS) *
+		 RTE_NB_TXQ_STATS;
 	return count;
 }
 
@@ -1358,6 +1360,7 @@ rte_eth_xstats_get_names(uint8_t port_id,
 	int cnt_expected_entries;
 	int cnt_driver_entries;
 	uint32_t idx, id_queue;
+	uint16_t num_q;
 
 	cnt_expected_entries = get_xstats_count(port_id);
 	if (xstats_names == NULL || cnt_expected_entries < 0 ||
@@ -1374,7 +1377,8 @@ rte_eth_xstats_get_names(uint8_t port_id,
 			"%s", rte_stats_strings[idx].name);
 		cnt_used_entries++;
 	}
-	for (id_queue = 0; id_queue < dev->data->nb_rx_queues; id_queue++) {
+	num_q = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+	for (id_queue = 0; id_queue < num_q; id_queue++) {
 		for (idx = 0; idx < RTE_NB_RXQ_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
@@ -1384,7 +1388,8 @@ rte_eth_xstats_get_names(uint8_t port_id,
 		}
 
 	}
-	for (id_queue = 0; id_queue < dev->data->nb_tx_queues; id_queue++) {
+	num_q = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+	for (id_queue = 0; id_queue < num_q; id_queue++) {
 		for (idx = 0; idx < RTE_NB_TXQ_STATS; idx++) {
 			snprintf(xstats_names[cnt_used_entries].name,
 				sizeof(xstats_names[0].name),
@@ -1420,14 +1425,18 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 	unsigned count = 0, i, q;
 	signed xcount = 0;
 	uint64_t val, *stats_ptr;
+	uint16_t nb_rxqs, nb_txqs;
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
 
 	dev = &rte_eth_devices[port_id];
 
+	nb_rxqs = RTE_MIN(dev->data->nb_rx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+	nb_txqs = RTE_MIN(dev->data->nb_tx_queues, RTE_ETHDEV_QUEUE_STAT_CNTRS);
+
 	/* Return generic statistics */
-	count = RTE_NB_STATS + (dev->data->nb_rx_queues * RTE_NB_RXQ_STATS) +
-		(dev->data->nb_tx_queues * RTE_NB_TXQ_STATS);
+	count = RTE_NB_STATS + (nb_rxqs * RTE_NB_RXQ_STATS) +
+		(nb_txqs * RTE_NB_TXQ_STATS);
 
 	/* implemented by the driver */
 	if (dev->dev_ops->xstats_get != NULL) {
@@ -1458,7 +1467,7 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 	}
 
 	/* per-rxq stats */
-	for (q = 0; q < dev->data->nb_rx_queues; q++) {
+	for (q = 0; q < nb_rxqs; q++) {
 		for (i = 0; i < RTE_NB_RXQ_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
 					rte_rxq_stats_strings[i].offset +
@@ -1469,7 +1478,7 @@ rte_eth_xstats_get(uint8_t port_id, struct rte_eth_xstat *xstats,
 	}
 
 	/* per-txq stats */
-	for (q = 0; q < dev->data->nb_tx_queues; q++) {
+	for (q = 0; q < nb_txqs; q++) {
 		for (i = 0; i < RTE_NB_TXQ_STATS; i++) {
 			stats_ptr = RTE_PTR_ADD(&eth_stats,
 					rte_txq_stats_strings[i].offset +
-- 
1.9.0