netdev - Re: [PATCH 1/7] net: refactor __netif_receive_skb

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Date:	Fri, 10 Apr 2015 15:47:34 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>,
	netfilter-devel@...r.kernel.org
CC:	kaber@...sh.net, netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH 1/7] net: refactor __netif_receive_skb_core

On 04/10/2015 02:15 PM, Pablo Neira Ayuso wrote:
> This patch splits __netif_receive_skb_core() in smaller functions to improve
> maintainability.
>
> The function __netif_receive_skb_core() has been split in two:
>
> * __netif_receive_skb_ingress(), to perform all actions up to
>    ingress filtering.
>
> * __netif_receive_skb_finish(), if the ingress filter accepts this
>    packet, pass it to the corresponding packet_type function handler for further
> processing.
>
> This patch also adds __NET_RX_ANOTHER_ROUND that is used when the packet is
> stripped off from the vlan header or in case the rx_handler needs it.
>
> This also prepares the introduction of the netfilter ingress hook.

Out of curiosity, what is actually the performance impact on all
of this? We were just arguing on a different matter on two more
instructions in the fast-path, here it's refactoring the whole
function into several ones, I presume gcc won't inline it.
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