net_sched: factorize qdisc stats handling

HTB takes into account skb is segmented in stats updates.
Generalize this to all schedulers.

They should use qdisc_bstats_update() helper instead of manipulating
bstats.bytes and bstats.packets

Add bstats_update() helper too for classes that use
gnet_stats_basic_packed fields.

Note : Right now, TCQ_F_CAN_BYPASS shortcurt can be taken only if no
stab is setup on qdisc.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 6 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 0af57ebae762..e9eee99d8b1f 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -207,7 +207,7 @@ static inline int qdisc_qlen(struct Qdisc *q)
         return q->q.qlen;
 }
 
-static inline struct qdisc_skb_cb *qdisc_skb_cb(struct sk_buff *skb)
+static inline struct qdisc_skb_cb *qdisc_skb_cb(const struct sk_buff *skb)
 {
         return (struct qdisc_skb_cb *)skb->cb;
 }
@@ -394,7 +394,7 @@ static inline bool qdisc_tx_is_noop(const struct net_device *dev)
         return true;
 }
 
-static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
+static inline unsigned int qdisc_pkt_len(const struct sk_buff *skb)
 {
         return qdisc_skb_cb(skb)->pkt_len;
 }
@@ -426,10 +426,18 @@ static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
         return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
 }
 
-static inline void __qdisc_update_bstats(struct Qdisc *sch, unsigned int len)
+
+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;
+}
+
+static inline void qdisc_bstats_update(struct Qdisc *sch,
+                                       const struct sk_buff *skb)
 {
-        sch->bstats.bytes += len;
-        sch->bstats.packets++;
+        bstats_update(&sch->bstats, skb);
 }
 
 static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
@@ -437,7 +445,7 @@ static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,
 {
         __skb_queue_tail(list, skb);
         sch->qstats.backlog += qdisc_pkt_len(skb);
-        __qdisc_update_bstats(sch, qdisc_pkt_len(skb));
+        qdisc_bstats_update(sch, skb);
 
         return NET_XMIT_SUCCESS;
 }