net/sched: Enable netdev drivers to update statistics of offloaded actions

Introduce stats_update callback. netdev driver could call it for offloaded
actions to update the basic statistics (packets, bytes and last use).
Since bstats_update() and bstats_cpu_update() use skb as an argument to
get the counters, _bstats_update() and _bstats_cpu_update(), that get
bytes and packets as arguments, were added.
Signed-off-by: Amir Vadai <amirva@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/act_api.h

@@ -106,6 +106,7 @@ struct tc_action_ops {
 			int bind);
 	int     (*walk)(struct net *, struct sk_buff *,
 			struct netlink_callback *, int, struct tc_action *);
+	void	(*stats_update)(struct tc_action *, u64, u32, u64);
 };
 
 struct tc_action_net {
@@ -178,10 +179,21 @@ int tcf_action_copy_stats(struct sk_buff *, struct tc_action *, int);
 
 #define tc_for_each_action(_a, _exts) \
 	list_for_each_entry(a, &(_exts)->actions, list)
+
+static inline void tcf_action_stats_update(struct tc_action *a, u64 bytes,
+					   u64 packets, u64 lastuse)
+{
+	if (!a->ops->stats_update)
+		return;
+
+	a->ops->stats_update(a, bytes, packets, lastuse);
+}
+
 #else /* CONFIG_NET_CLS_ACT */
 
 #define tc_no_actions(_exts) true
 #define tc_for_each_action(_a, _exts) while (0)
+#define tcf_action_stats_update(a, bytes, packets, lastuse)
 
 #endif /* CONFIG_NET_CLS_ACT */
 #endif

include/net/sch_generic.h

@@ -527,11 +527,27 @@ static inline bool qdisc_is_percpu_stats(const struct Qdisc *q)
 	return q->flags & TCQ_F_CPUSTATS;
 }
 
+static inline void _bstats_update(struct gnet_stats_basic_packed *bstats,
+				  __u64 bytes, __u32 packets)
+{
+	bstats->bytes += bytes;
+	bstats->packets += packets;
+}
+
 static inline void bstats_update(struct gnet_stats_basic_packed *bstats,
 				 const struct sk_buff *skb)
 {
-	bstats->bytes += qdisc_pkt_len(skb);
-	bstats->packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
+	_bstats_update(bstats,
+		       qdisc_pkt_len(skb),
+		       skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1);
+}
+
+static inline void _bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,
+				      __u64 bytes, __u32 packets)
+{
+	u64_stats_update_begin(&bstats->syncp);
+	_bstats_update(&bstats->bstats, bytes, packets);
+	u64_stats_update_end(&bstats->syncp);
 }
 
 static inline void bstats_cpu_update(struct gnet_stats_basic_cpu *bstats,