From: Jarek Poplawski <redacted>
Date: Mon, 4 Aug 2008 08:57:34 +0000

net_sched: Add qdisc __NET_XMIT_BYPASS flag

Patrick McHardy [off-list ref] noticed that it would be nice to
handle NET_XMIT_BYPASS by NET_XMIT_SUCCESS with an internal qdisc flag
__NET_XMIT_BYPASS and to remove the mapping from dev_queue_xmit().

David Miller [off-list ref] spotted a serious bug in the first
version of this patch.

Signed-off-by: Jarek Poplawski <redacted>

Applied, thanks Jarek.

After applying this I noticed that dst_input()'s usage of
plain NET_XMIT_BYPASS was bogus, and after killing that
there are no more references.

Thus I added the following commit.

commit cc6533e98a7f3cb7fce9d740da49195c7aa523a4
Author: David S. Miller [off-list ref]
Date:   Mon Aug 4 23:04:08 2008 -0700

    net: Kill plain NET_XMIT_BYPASS.
    
    dst_input() was doing something completely absurd, looping
    on skb->dst->input() if NET_XMIT_BYPASS was seen, but these
    functions never return such an error.
    
    And as a result plain ole' NET_XMIT_BYPASS has no more
    references and can be completely killed off.
    
    Signed-off-by: David S. Miller [off-list ref]

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index abbf5d5..488c56e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h

@@ -61,9 +61,6 @@ struct wireless_dev;
 #define NET_XMIT_DROP		1	/* skb dropped			*/
 #define NET_XMIT_CN		2	/* congestion notification	*/
 #define NET_XMIT_POLICED	3	/* skb is shot by police	*/
-#define NET_XMIT_BYPASS		4	/* packet does not leave via dequeue;
-					   (TC use only - dev_queue_xmit
-					   returns this as NET_XMIT_SUCCESS) */
 #define NET_XMIT_MASK		0xFFFF	/* qdisc flags in net/sch_generic.h */
 
 /* Backlog congestion levels */

diff --git a/include/net/dst.h b/include/net/dst.h
index c5c318a..8a8b71e 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h

@@ -252,17 +252,7 @@ static inline int dst_output(struct sk_buff *skb)
 /* Input packet from network to transport.  */
 static inline int dst_input(struct sk_buff *skb)
 {
-	int err;
-
-	for (;;) {
-		err = skb->dst->input(skb);
-
-		if (likely(err == 0))
-			return err;
-		/* Oh, Jamal... Seems, I will not forgive you this mess. :-) */
-		if (unlikely(err != NET_XMIT_BYPASS))
-			return err;
-	}
+	return skb->dst->input(skb);
 }
 
 static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)