net/bnxt: fix xstats

[ upstream commit a9586ab ]

If the HWRM_PORT_QSTATS_EXT fails to initialize
fw_rx_port_stats_ext_size or fw_tx_port_stats_ext_size,
the driver can end up passing junk statistics to the application.

Instead of relying on the application to initialize the xstats
buffer before calling the xstats_get dev_op, memset xstats
with zeros to avoid returning or displaying incorrect statistics.

Also fixed the buffer starting offset.

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

Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>

drivers/net/bnxt/bnxt_ethdev.c

@@ -3349,15 +3349,17 @@ bnxt_dev_init(struct rte_eth_dev *eth_dev)
 			goto skip_ext_stats;
 
 		bp->hw_rx_port_stats_ext = (void *)
-			(bp->hw_rx_port_stats + sizeof(struct rx_port_stats));
+			((uint8_t *)bp->hw_rx_port_stats +
+			 sizeof(struct rx_port_stats));
 		bp->hw_rx_port_stats_ext_map = bp->hw_rx_port_stats_map +
 			sizeof(struct rx_port_stats);
 		bp->flags |= BNXT_FLAG_EXT_RX_PORT_STATS;
 
 
 		if (bp->hwrm_spec_code < HWRM_SPEC_CODE_1_9_2) {
 			bp->hw_tx_port_stats_ext = (void *)
-			(bp->hw_tx_port_stats + sizeof(struct tx_port_stats));
+				((uint8_t *)bp->hw_tx_port_stats +
+				 sizeof(struct tx_port_stats));
 			bp->hw_tx_port_stats_ext_map =
 				bp->hw_tx_port_stats_map +
 				sizeof(struct tx_port_stats);

drivers/net/bnxt/bnxt_stats.c

@@ -414,6 +414,8 @@ int bnxt_dev_xstats_get_op(struct rte_eth_dev *eth_dev,
 	unsigned int stat_size = sizeof(uint64_t);
 	unsigned int stat_count;
 
+	memset(xstats, 0, sizeof(*xstats));
+
 	bnxt_hwrm_port_qstats(bp);
 	bnxt_hwrm_func_qstats_tx_drop(bp, 0xffff, &tx_drop_pkts);
 	bnxt_hwrm_ext_port_qstats(bp);