idpf: remove legacy Page Pool Ethtool stats

Page Pool Ethtool stats are deprecated since the Netlink Page Pool
interface introduction.
idpf receives big changes in Rx buffer management, including &page_pool
layout, so keeping these deprecated stats does only harm, not speaking
of that CONFIG_IDPF selects CONFIG_PAGE_POOL_STATS unconditionally,
while the latter is often turned off for better performance.
Remove all the references to PP stats from the Ethtool code. The stats
are still available in their full via the generic Netlink interface.
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/idpf/Kconfig

@@ -7,7 +7,6 @@ config IDPF
 	select DIMLIB
 	select LIBETH
 	select PAGE_POOL
-	select PAGE_POOL_STATS
 	help
 	  This driver supports Intel(R) Infrastructure Data Path Function
 	  devices.

drivers/net/ethernet/intel/idpf/idpf_ethtool.c

@@ -565,8 +565,6 @@ static void idpf_get_stat_strings(struct net_device *netdev, u8 *data)
 	for (i = 0; i < vport_config->max_q.max_rxq; i++)
 		idpf_add_qstat_strings(&data, idpf_gstrings_rx_queue_stats,
 				       "rx", i);
-
-	page_pool_ethtool_stats_get_strings(data);
 }
 
 /**
@@ -600,7 +598,6 @@ static int idpf_get_sset_count(struct net_device *netdev, int sset)
 	struct idpf_netdev_priv *np = netdev_priv(netdev);
 	struct idpf_vport_config *vport_config;
 	u16 max_txq, max_rxq;
-	unsigned int size;
 
 	if (sset != ETH_SS_STATS)
 		return -EINVAL;
@@ -619,11 +616,8 @@ static int idpf_get_sset_count(struct net_device *netdev, int sset)
 	max_txq = vport_config->max_q.max_txq;
 	max_rxq = vport_config->max_q.max_rxq;
 
-	size = IDPF_PORT_STATS_LEN + (IDPF_TX_QUEUE_STATS_LEN * max_txq) +
+	return IDPF_PORT_STATS_LEN + (IDPF_TX_QUEUE_STATS_LEN * max_txq) +
 	       (IDPF_RX_QUEUE_STATS_LEN * max_rxq);
-	size += page_pool_ethtool_stats_get_count();
-
-	return size;
 }
 
 /**
@@ -876,7 +870,6 @@ static void idpf_get_ethtool_stats(struct net_device *netdev,
 {
 	struct idpf_netdev_priv *np = netdev_priv(netdev);
 	struct idpf_vport_config *vport_config;
-	struct page_pool_stats pp_stats = { };
 	struct idpf_vport *vport;
 	unsigned int total = 0;
 	unsigned int i, j;
@@ -946,32 +939,12 @@ static void idpf_get_ethtool_stats(struct net_device *netdev,
 				idpf_add_empty_queue_stats(&data, qtype);
 			else
 				idpf_add_queue_stats(&data, rxq, qtype);
-
-			/* In splitq mode, don't get page pool stats here since
-			 * the pools are attached to the buffer queues
-			 */
-			if (is_splitq)
-				continue;
-
-			if (rxq)
-				page_pool_get_stats(rxq->pp, &pp_stats);
-		}
-	}
-
-	for (i = 0; i < vport->num_rxq_grp; i++) {
-		for (j = 0; j < vport->num_bufqs_per_qgrp; j++) {
-			struct idpf_buf_queue *rxbufq =
-				&vport->rxq_grps[i].splitq.bufq_sets[j].bufq;
-
-			page_pool_get_stats(rxbufq->pp, &pp_stats);
 		}
 	}
 
 	for (; total < vport_config->max_q.max_rxq; total++)
 		idpf_add_empty_queue_stats(&data, VIRTCHNL2_QUEUE_TYPE_RX);
 
-	page_pool_ethtool_stats_get(data, &pp_stats);
-
 	rcu_read_unlock();
 
 	idpf_vport_ctrl_unlock(netdev);