bnxt_en: Fix 2 stray ethtool -S counters

The recent firmware interface change has added 2 counters in struct
rx_port_stats_ext. This caused 2 stray ethtool counters to be
displayed.

Since new counters are added from time to time, fix it so that the
ethtool logic will only display up to the maximum known counters.
These 2 counters are not used by production firmware yet.

Fixes: 754fbf6 ("bnxt_en: Update firmware interface to 1.10.2.171")
Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231026013231.53271-1-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -535,15 +535,20 @@ static int bnxt_get_num_ring_stats(struct bnxt *bp)
 static int bnxt_get_num_stats(struct bnxt *bp)
 {
 	int num_stats = bnxt_get_num_ring_stats(bp);
+	int len;
 
 	num_stats += BNXT_NUM_RING_ERR_STATS;
 
 	if (bp->flags & BNXT_FLAG_PORT_STATS)
 		num_stats += BNXT_NUM_PORT_STATS;
 
 	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
-		num_stats += bp->fw_rx_stats_ext_size +
-			     bp->fw_tx_stats_ext_size;
+		len = min_t(int, bp->fw_rx_stats_ext_size,
+			    ARRAY_SIZE(bnxt_port_stats_ext_arr));
+		num_stats += len;
+		len = min_t(int, bp->fw_tx_stats_ext_size,
+			    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
+		num_stats += len;
 		if (bp->pri2cos_valid)
 			num_stats += BNXT_NUM_STATS_PRI;
 	}
@@ -653,12 +658,17 @@ static void bnxt_get_ethtool_stats(struct net_device *dev,
 	if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
 		u64 *rx_port_stats_ext = bp->rx_port_stats_ext.sw_stats;
 		u64 *tx_port_stats_ext = bp->tx_port_stats_ext.sw_stats;
+		u32 len;
 
-		for (i = 0; i < bp->fw_rx_stats_ext_size; i++, j++) {
+		len = min_t(u32, bp->fw_rx_stats_ext_size,
+			    ARRAY_SIZE(bnxt_port_stats_ext_arr));
+		for (i = 0; i < len; i++, j++) {
 			buf[j] = *(rx_port_stats_ext +
 				   bnxt_port_stats_ext_arr[i].offset);
 		}
-		for (i = 0; i < bp->fw_tx_stats_ext_size; i++, j++) {
+		len = min_t(u32, bp->fw_tx_stats_ext_size,
+			    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
+		for (i = 0; i < len; i++, j++) {
 			buf[j] = *(tx_port_stats_ext +
 				   bnxt_tx_port_stats_ext_arr[i].offset);
 		}
@@ -757,11 +767,17 @@ static void bnxt_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
 			}
 		}
 		if (bp->flags & BNXT_FLAG_PORT_STATS_EXT) {
-			for (i = 0; i < bp->fw_rx_stats_ext_size; i++) {
+			u32 len;
+
+			len = min_t(u32, bp->fw_rx_stats_ext_size,
+				    ARRAY_SIZE(bnxt_port_stats_ext_arr));
+			for (i = 0; i < len; i++) {
 				strcpy(buf, bnxt_port_stats_ext_arr[i].string);
 				buf += ETH_GSTRING_LEN;
 			}
-			for (i = 0; i < bp->fw_tx_stats_ext_size; i++) {
+			len = min_t(u32, bp->fw_tx_stats_ext_size,
+				    ARRAY_SIZE(bnxt_tx_port_stats_ext_arr));
+			for (i = 0; i < len; i++) {
 				strcpy(buf,
 				       bnxt_tx_port_stats_ext_arr[i].string);
 				buf += ETH_GSTRING_LEN;