net: macsec: Leverage core stats 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 macsec driver and leverage the network
core allocation instead.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/20240305113728.1974944-1-leitao@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/macsec.c

@@ -3519,18 +3519,13 @@ static int macsec_dev_init(struct net_device *dev)
 	struct net_device *real_dev = macsec->real_dev;
 	int err;
 
-	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
-	if (!dev->tstats)
-		return -ENOMEM;
-
 	err = gro_cells_init(&macsec->gro_cells, dev);
-	if (err) {
-		free_percpu(dev->tstats);
+	if (err)
 		return err;
-	}
 
 	dev->features = real_dev->features & MACSEC_FEATURES;
 	dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
+	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
 
 	macsec_set_head_tail_room(dev);
 
@@ -3550,7 +3545,6 @@ static void macsec_dev_uninit(struct net_device *dev)
 	struct macsec_dev *macsec = macsec_priv(dev);
 
 	gro_cells_destroy(&macsec->gro_cells);
-	free_percpu(dev->tstats);
 }
 
 static netdev_features_t macsec_fix_features(struct net_device *dev,