netdev - Re: [patch net-next 3/4] net: refactor IPv4 and IPv6 fragmentation APIs

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Date:	Mon, 9 Mar 2015 18:25:59 +0900
From:	Simon Horman <simon.horman@...ronome.com>
To:	Andy Zhou <azhou@...ira.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [patch net-next 3/4] net: refactor IPv4 and IPv6 fragmentation
 APIs

On Mon, Mar 09, 2015 at 01:01:37AM -0700, Andy Zhou wrote:
> Both ip_fragment() and ip6_fragment() APIs assume skb has an
> attached netdev device, from which the MTU size can be derived.
> However, skbs incoming from OVS vports do not have an attached
> netdev device.
> 
> This patch splits the original function into two parts: The core
> fragmentation logic is now provided by
> ip_fragment_mtu()/ip6_fragment_mut().
> 
> The original APIs are kept as is. Their implementation now calls
> the new APIs. Any information derived from the attached netdev
> device is first derived in the original APIs and passed into the
> new APIs.
> 
> In addition, The call back output function into the new APIs now
> accepts two arguments: a skb and an application specific pointer,
> which specifies additional information not directly associated
> with skb, such as OVS flow, to the output function.

I suggest handling that portion of the change separately.
It doesn't seem nearly as well defined as the rest of the change.
And cast below seems somewhat undesirable to me.

[snip]

> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> index a7aea20..b85fd34 100644
> --- a/net/ipv4/ip_output.c
> +++ b/net/ipv4/ip_output.c

> +	return ip_fragment_mtu(skb, mtu, ll_rs, NULL, dev,
> +			(int (*)(struct sk_buff *, void *output_arg))output);
> +}
>  EXPORT_SYMBOL(ip_fragment);
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