path: root/include/net/sch_generic.h
diff options
authorJarek Poplawski <jarkao2@gmail.com>2008-08-04 22:31:03 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-04 22:31:03 -0700
commit378a2f090f7a478704a372a4869b8a9ac206234e (patch)
treecf324a45a9dc21231d1d3225c51c9d5d2b57bbee /include/net/sch_generic.h
parentnet: eliminate refcounting in backlog queue (diff)
net_sched: Add qdisc __NET_XMIT_STOLEN flag
Patrick McHardy <kaber@trash.net> noticed: "The other problem that affects all qdiscs supporting actions is TC_ACT_QUEUED/TC_ACT_STOLEN getting mapped to NET_XMIT_SUCCESS even though the packet is not queued, corrupting upper qdiscs' qlen counters." and later explained: "The reason why it translates it at all seems to be to not increase the drops counter. Within a single qdisc this could be avoided by other means easily, upper qdiscs would still increase the counter when we return anything besides NET_XMIT_SUCCESS though. This means we need a new NET_XMIT return value to indicate this to the upper qdiscs. So I'd suggest to introduce NET_XMIT_STOLEN, return that to upper qdiscs and translate it to NET_XMIT_SUCCESS in dev_queue_xmit, similar to NET_XMIT_BYPASS." David Miller <davem@davemloft.net> noticed: "Maybe these NET_XMIT_* values being passed around should be a set of bits. They could be composed of base meanings, combined with specific attributes. So you could say "NET_XMIT_DROP | __NET_XMIT_NO_DROP_COUNT" The attributes get masked out by the top-level ->enqueue() caller, such that the base meanings are the only thing that make their way up into the stack. If it's only about communication within the qdisc tree, let's simply code it that way." This patch is trying to realize these ideas. Signed-off-by: Jarek Poplawski <jarkao2@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sch_generic.h')
1 files changed, 13 insertions, 1 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index c5bb13065051..f15b045a85e9 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -343,6 +343,18 @@ static inline unsigned int qdisc_pkt_len(struct sk_buff *skb)
return qdisc_skb_cb(skb)->pkt_len;
+/* additional qdisc xmit flags */
+enum net_xmit_qdisc_t {
+ __NET_XMIT_STOLEN = 0x00010000,
+#define net_xmit_drop_count(e) ((e) & __NET_XMIT_STOLEN ? 0 : 1)
+#define net_xmit_drop_count(e) (1)
static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
@@ -355,7 +367,7 @@ static inline int qdisc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
static inline int qdisc_enqueue_root(struct sk_buff *skb, struct Qdisc *sch)
qdisc_skb_cb(skb)->pkt_len = skb->len;
- return qdisc_enqueue(skb, sch);
+ return qdisc_enqueue(skb, sch) & NET_XMIT_MASK;
static inline int __qdisc_enqueue_tail(struct sk_buff *skb, struct Qdisc *sch,