netdev - Re: [PATCH 6/6] net: move qdisc ingress filtering on top of netfilter ingress hooks

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Message-ID: <554172F9.7040002@iogearbox.net>
Date:	Thu, 30 Apr 2015 02:10:33 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	netfilter-devel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, jhs@...atatu.com
Subject: Re: [PATCH 6/6] net: move qdisc ingress filtering on top of netfilter
 ingress hooks

On 04/30/2015 01:32 AM, Pablo Neira Ayuso wrote:
...
> Actually, the extra cost is roughly (getting inlined stuff away and
> other non-relevant stuff):
>
>      `-> nf_hook_slow()
>       `-> [for each entry in hook list]
>        `-> nf_iterate()
>         `-> (*elemp)->hook()

Yep, agreed.

> as part of the generic hook infrastructure, which comes with extra
> flexibility in return. I think the main concern so far was not to harm
> the critical netif_receive_core() path, and this patchset proves not
> to affect this.

Correct, as you use the static key and hide everything behind it.
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