netdev - Re: [PATCH] TX_RING and packet mmap

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Date:	Tue, 07 Apr 2009 09:47:47 -0400
From:	jamal <hadi@...erus.ca>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Johann Baudy <johann.baudy@...-log.net>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] TX_RING and packet mmap

On Tue, 2009-04-07 at 21:04 +0800, Herbert Xu wrote:

> Well through tc ipt actions you can invoke arbitrary netfilter
> targets, including MARK --set-mark.

I thought you were saying this issue can be solved by 
tc/mark but you meant tc/mark is one culprit;->
Solvable by making sure tc/mark is not used in the system
you are running an app using this feature.

But the superset of what Johann wants seems to be a common 
issue: identifying _precisely_ when the skb sent out is done 
with - in his case, so he can use some field to lookup a table.
Other times i have seen people ask for it is for tun/tap 
notification in user space when a packet sent actually went out.

> In fact I've never really liked tc ipt actions since it doesn't
> do any sanity checking on the packet before invoking the target
> while normally netfitler does quite a bit of sanity checking.

more could be done in user space if you really need it.

cheers,
jamal

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