bnxt: add pause frame stats

These stats are already reported in ethtool -S.
Hopefully they are equivalent to standard stats?

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1778,6 +1778,24 @@ static void bnxt_get_pauseparam(struct net_device *dev,
 	epause->tx_pause = !!(link_info->req_flow_ctrl & BNXT_LINK_PAUSE_TX);
 }
 
+static void bnxt_get_pause_stats(struct net_device *dev,
+				 struct ethtool_pause_stats *epstat)
+{
+	struct bnxt *bp = netdev_priv(dev);
+	struct rx_port_stats *rx_stats;
+	struct tx_port_stats *tx_stats;
+
+	if (BNXT_VF(bp) || !(bp->flags & BNXT_FLAG_PORT_STATS))
+		return;
+
+	rx_stats = (void *)bp->port_stats.sw_stats;
+	tx_stats = (void *)((unsigned long)bp->port_stats.sw_stats +
+			    BNXT_TX_PORT_STATS_BYTE_OFFSET);
+
+	epstat->rx_pause_frames = rx_stats->rx_pause_frames;
+	epstat->tx_pause_frames = tx_stats->tx_pause_frames;
+}
+
 static int bnxt_set_pauseparam(struct net_device *dev,
 			       struct ethtool_pauseparam *epause)
 {
@@ -3645,6 +3663,7 @@ const struct ethtool_ops bnxt_ethtool_ops = {
 				     ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
 	.get_link_ksettings	= bnxt_get_link_ksettings,
 	.set_link_ksettings	= bnxt_set_link_ksettings,
+	.get_pause_stats	= bnxt_get_pause_stats,
 	.get_pauseparam		= bnxt_get_pauseparam,
 	.set_pauseparam		= bnxt_set_pauseparam,
 	.get_drvinfo		= bnxt_get_drvinfo,