net/bnxt: fix extended port counter statistics

[ upstream commit b02a39ba3ba043827fb91c175900aed0eddf0d2d ]

We were trying to fill in more rx extended stats than the size allocated
for stats causing segfault. Fixed this by adding an explicit check.
Rearranged the code to return statistic values in xstats_get as per the
names returned in xstats_get_names.

Fixes: f55e12f ("net/bnxt: support extended port counters")

Signed-off-by: Rahul Gupta <rahul.gupta@broadcom.com>
Signed-off-by: Santoshkumar Karanappa Rastapur <santosh.rastapur@broadcom.com>
Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>

drivers/net/bnxt/bnxt_stats.c

@@ -426,8 +426,12 @@ int bnxt_dev_xstats_get_op(struct rte_eth_dev *eth_dev,
 	bnxt_hwrm_port_qstats(bp);
 	bnxt_hwrm_func_qstats_tx_drop(bp, 0xffff, &tx_drop_pkts);
 	bnxt_hwrm_ext_port_qstats(bp);
-	rx_port_stats_ext_cnt = bp->fw_rx_port_stats_ext_size / stat_size;
-	tx_port_stats_ext_cnt = bp->fw_tx_port_stats_ext_size / stat_size;
+	rx_port_stats_ext_cnt = RTE_MIN(RTE_DIM(bnxt_rx_ext_stats_strings),
+					(bp->fw_rx_port_stats_ext_size /
+					 stat_size));
+	tx_port_stats_ext_cnt = RTE_MIN(RTE_DIM(bnxt_tx_ext_stats_strings),
+					(bp->fw_tx_port_stats_ext_size /
+					 stat_size));
 
 	count = RTE_DIM(bnxt_rx_stats_strings) +
 		RTE_DIM(bnxt_tx_stats_strings) + 1/* For tx_drop_pkts */ +
@@ -462,22 +466,22 @@ int bnxt_dev_xstats_get_op(struct rte_eth_dev *eth_dev,
 	xstats[count].value = rte_le_to_cpu_64(tx_drop_pkts);
 	count++;
 
-	for (i = 0; i < tx_port_stats_ext_cnt; i++) {
-		uint64_t *tx_stats_ext = (uint64_t *)bp->hw_tx_port_stats_ext;
+	for (i = 0; i < rx_port_stats_ext_cnt; i++) {
+		uint64_t *rx_stats_ext = (uint64_t *)bp->hw_rx_port_stats_ext;
 
 		xstats[count].value = rte_le_to_cpu_64
-					(*(uint64_t *)((char *)tx_stats_ext +
-					 bnxt_tx_ext_stats_strings[i].offset));
+					(*(uint64_t *)((char *)rx_stats_ext +
+					 bnxt_rx_ext_stats_strings[i].offset));
 
 		count++;
 	}
 
-	for (i = 0; i < rx_port_stats_ext_cnt; i++) {
-		uint64_t *rx_stats_ext = (uint64_t *)bp->hw_rx_port_stats_ext;
+	for (i = 0; i < tx_port_stats_ext_cnt; i++) {
+		uint64_t *tx_stats_ext = (uint64_t *)bp->hw_tx_port_stats_ext;
 
 		xstats[count].value = rte_le_to_cpu_64
-					(*(uint64_t *)((char *)rx_stats_ext +
-					 bnxt_rx_ext_stats_strings[i].offset));
+					(*(uint64_t *)((char *)tx_stats_ext +
+					 bnxt_tx_ext_stats_strings[i].offset));
 
 		count++;
 	}