[PATCH nf-next 1/3] 8021q: add vlan_dev_sw_netstats_rx_add() and vlan_dev_sw_netstats_tx_add()

[Julius Bairaktaris <julius@bairaktaris.de>]

Let code that forwards packets on behalf of a VLAN device update its
per-cpu counters, like dev_sw_netstats_rx_add() and
dev_sw_netstats_tx_add() do for devices with tstats. The netfilter
flowtable fast path uses them in the next patch.

Assisted-by: Claude:claude-fable-5-1
Signed-off-by: Julius Bairaktaris <julius@bairaktaris.de>
---
 include/linux/if_vlan.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 20cc16ea4e5a..4873a12958da 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -231,6 +231,31 @@ vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
 	return vlan_qos;
 }
 
+static inline void vlan_dev_sw_netstats_rx_add(struct net_device *dev,
+					       unsigned int len)
+{
+	struct vlan_pcpu_stats *stats;
+
+	stats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
+	u64_stats_update_begin(&stats->syncp);
+	u64_stats_inc(&stats->rx_packets);
+	u64_stats_add(&stats->rx_bytes, len);
+	u64_stats_update_end(&stats->syncp);
+}
+
+static inline void vlan_dev_sw_netstats_tx_add(struct net_device *dev,
+					       unsigned int packets,
+					       unsigned int len)
+{
+	struct vlan_pcpu_stats *stats;
+
+	stats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
+	u64_stats_update_begin(&stats->syncp);
+	u64_stats_add(&stats->tx_packets, packets);
+	u64_stats_add(&stats->tx_bytes, len);
+	u64_stats_update_end(&stats->syncp);
+}
+
 extern bool vlan_do_receive(struct sk_buff **skb);
 
 extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
@@ -249,6 +274,17 @@ static inline bool is_vlan_dev(const struct net_device *dev)
 	return false;
 }
 
+static inline void vlan_dev_sw_netstats_rx_add(struct net_device *dev,
+					       unsigned int len)
+{
+}
+
+static inline void vlan_dev_sw_netstats_tx_add(struct net_device *dev,
+					       unsigned int packets,
+					       unsigned int len)
+{
+}
+
 static inline struct net_device *
 __vlan_find_dev_deep_rcu(struct net_device *real_dev,
 		     __be16 vlan_proto, u16 vlan_id)
-- 
2.53.0