bareudp: Fix device stats updates.

Bareudp devices update their stats concurrently.
Therefore they need proper atomic increments.

Fixes: 571912c ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/04b7b9d0b480158eb3ab4366ec80aa2ab7e41fcb.1725031794.git.gnault@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/bareudp.c

@@ -83,7 +83,7 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 
 		if (skb_copy_bits(skb, BAREUDP_BASE_HLEN, &ipversion,
 				  sizeof(ipversion))) {
-			bareudp->dev->stats.rx_dropped++;
+			DEV_STATS_INC(bareudp->dev, rx_dropped);
 			goto drop;
 		}
 		ipversion >>= 4;
@@ -93,7 +93,7 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 		} else if (ipversion == 6 && bareudp->multi_proto_mode) {
 			proto = htons(ETH_P_IPV6);
 		} else {
-			bareudp->dev->stats.rx_dropped++;
+			DEV_STATS_INC(bareudp->dev, rx_dropped);
 			goto drop;
 		}
 	} else if (bareudp->ethertype == htons(ETH_P_MPLS_UC)) {
@@ -107,7 +107,7 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 				   ipv4_is_multicast(tunnel_hdr->daddr)) {
 				proto = htons(ETH_P_MPLS_MC);
 			} else {
-				bareudp->dev->stats.rx_dropped++;
+				DEV_STATS_INC(bareudp->dev, rx_dropped);
 				goto drop;
 			}
 		} else {
@@ -123,7 +123,7 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 				   (addr_type & IPV6_ADDR_MULTICAST)) {
 				proto = htons(ETH_P_MPLS_MC);
 			} else {
-				bareudp->dev->stats.rx_dropped++;
+				DEV_STATS_INC(bareudp->dev, rx_dropped);
 				goto drop;
 			}
 		}
@@ -135,15 +135,15 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 				 proto,
 				 !net_eq(bareudp->net,
 				 dev_net(bareudp->dev)))) {
-		bareudp->dev->stats.rx_dropped++;
+		DEV_STATS_INC(bareudp->dev, rx_dropped);
 		goto drop;
 	}
 
 	__set_bit(IP_TUNNEL_KEY_BIT, key);
 
 	tun_dst = udp_tun_rx_dst(skb, family, key, 0, 0);
 	if (!tun_dst) {
-		bareudp->dev->stats.rx_dropped++;
+		DEV_STATS_INC(bareudp->dev, rx_dropped);
 		goto drop;
 	}
 	skb_dst_set(skb, &tun_dst->dst);
@@ -169,8 +169,8 @@ static int bareudp_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
 						     &((struct ipv6hdr *)oiph)->saddr);
 		}
 		if (err > 1) {
-			++bareudp->dev->stats.rx_frame_errors;
-			++bareudp->dev->stats.rx_errors;
+			DEV_STATS_INC(bareudp->dev, rx_frame_errors);
+			DEV_STATS_INC(bareudp->dev, rx_errors);
 			goto drop;
 		}
 	}
@@ -467,11 +467,11 @@ static netdev_tx_t bareudp_xmit(struct sk_buff *skb, struct net_device *dev)
 	dev_kfree_skb(skb);
 
 	if (err == -ELOOP)
-		dev->stats.collisions++;
+		DEV_STATS_INC(dev, collisions);
 	else if (err == -ENETUNREACH)
-		dev->stats.tx_carrier_errors++;
+		DEV_STATS_INC(dev, tx_carrier_errors);
 
-	dev->stats.tx_errors++;
+	DEV_STATS_INC(dev, tx_errors);
 	return NETDEV_TX_OK;
 }