netdev - Re: [PATCH take 2] net_sched: Add qdisc __NET_XMIT

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Date:	Mon, 04 Aug 2008 21:35:35 +0300
From:	"Jussi Kivilinna" <jussi.kivilinna@...et.fi>
To:	"Jarek Poplawski" <jarkao2@...il.com>
Cc:	"David Miller" <davem@...emloft.net>, kaber@...sh.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH take 2] net_sched: Add qdisc __NET_XMIT_BYPASS flag

Quoting "Jarek Poplawski" <jarkao2@...il.com>:

>
> These 2 patches aren't supposed to fix these problems:
>
> - the __NET_XMIT_STOLEN patch fixes a problem when a qdiscs passed
>   upwards NET_XMIT_SUCCESS when eg. an skb was stolen by an action,
>   to prevent treating this as dropped; then the upper qdiscs couldn't
>   tell it's not the full NET_XMIT_SUCCESS and counted it as queued,
>   which was wrong. (BTW, I especially tried to do it with minimal
>   changes in htb_enqueue() to let you apply your htb patch without
>   much editing.)
>
> - the __NET_XMIT_BYPASS actually doesn't fix any serious problem, but
>   lets to remove the mapping from dev_queue_xmit(), and BTW it passes
>   better information to upper qdiscs too.
>

This seems to also make sure that when returning 'full'  
NET_XMIT_SUCCESS, skb pointer is safe(r?) to use now.


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