netdev - Re: [PATCH net-next V1 1/2] net: Header length compution function

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Date:	Mon, 28 Jul 2014 14:26:08 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	Amir Vadai <amirv@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Yevgeny Petrilin <yevgenyp@...lanox.com>,
	Ido Shamay <idos@...lanox.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH net-next V1 1/2] net: Header length compution function

On Mon, Jul 28, 2014 at 7:50 AM, Alexander Duyck
<alexander.h.duyck@...el.com> wrote:
> On 07/28/2014 04:28 AM, Amir Vadai wrote:
>> +u32 eth_frame_headlen(void *data, unsigned int len)
>> +{
>> +     const struct ethhdr *eth = data;
>> +     struct sk_buff skb;
>> +
>> +     if (unlikely(len < ETH_HLEN))
>> +             return len;
>> +
>> +     skb.protocol = eth->h_proto;
>> +     skb.head = data + ETH_HLEN;
>> +     skb.data = skb.head;
>> +     skb_reset_network_header(&skb);
>> +     skb.len = len - ETH_HLEN;
>> +     skb.data_len = 0;
>> +     return __skb_get_poff(&skb) + ETH_HLEN;
>> +}
>
> I'm still not a big fan of allocating an sk_buff on the stack.  Seems
> like it isn't maintainable and really opens things up to possible issues
> if someone ever extends the __skb_get_poff call.  But I'm not going to
> force the issue since for now this isn't impacting igb or ixgbe.
>

+1

I think you can refactor the code to pass all these input as
arguments instead of a whole skbuff.
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