IB/hfi1: Do not use custom stat allocator

With commit 34d21de ("net: Move {l,t,d}stats allocation to core and
convert veth & vrf"), stats allocation could be done on net core
instead of in this driver.

With this new approach, the driver doesn't have to bother with error
handling (allocation failure checking, making sure free happens in the
right spot, etc). This is core responsibility now.

Remove the allocation in the hfi1 driver and leverage the network
core allocation instead.

Signed-off-by: Breno Leitao <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: leitao

drivers/infiniband/hw/hfi1/ipoib_main.c

@@ -21,36 +21,25 @@ static int hfi1_ipoib_dev_init(struct net_device *dev)
 	struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
 	int ret;
 
-	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
 	ret = priv->netdev_ops->ndo_init(dev);
 	if (ret)
-		goto out_ret;
+		return ret;
 
 	ret = hfi1_netdev_add_data(priv->dd,
 				   qpn_from_mac(priv->netdev->dev_addr),
 				   dev);
 	if (ret < 0) {
 		priv->netdev_ops->ndo_uninit(dev);
-		goto out_ret;
+		return ret;
 	}
 
 	return 0;
-out_ret:
-	free_percpu(dev->tstats);
-	dev->tstats = NULL;
-	return ret;
 }
 
 static void hfi1_ipoib_dev_uninit(struct net_device *dev)
 {
 	struct hfi1_ipoib_dev_priv *priv = hfi1_ipoib_priv(dev);
 
-	free_percpu(dev->tstats);
-	dev->tstats = NULL;
-
 	hfi1_netdev_remove_data(priv->dd, qpn_from_mac(priv->netdev->dev_addr));
 
 	priv->netdev_ops->ndo_uninit(dev);
@@ -173,9 +162,6 @@ static void hfi1_ipoib_netdev_dtor(struct net_device *dev)
 
 	hfi1_ipoib_txreq_deinit(priv);
 	hfi1_ipoib_rxq_deinit(priv->netdev);
-
-	free_percpu(dev->tstats);
-	dev->tstats = NULL;
 }
 
 static void hfi1_ipoib_set_id(struct net_device *dev, int id)
@@ -234,6 +220,7 @@ static int hfi1_ipoib_setup_rn(struct ib_device *device,
 
 	netdev->priv_destructor = hfi1_ipoib_netdev_dtor;
 	netdev->needs_free_netdev = true;
+	netdev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 
 	return 0;
 }