netdev - Re: [PATCH net] bonding: enhance L2 hash helper with packet type

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Message-ID: <53C4DCB9.1050208@freescale.com>
Date:	Tue, 15 Jul 2014 15:48:09 +0800
From:	Jianhua Xie <jianhua.xie@...escale.com>
To:	David Miller <davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <j.vosburgh@...il.com>,
	<vfalico@...il.com>, <andy@...yhouse.net>,
	<Jiafei.Pan@...escale.com>
Subject: Re: [PATCH net] bonding: enhance L2 hash helper with packet type

On 7/15/2014 10:08 AM, David Miller wrote:
> From: Xie Jianhua <Jianhua.Xie@...escale.com>
> Date: Mon, 14 Jul 2014 14:05:26 +0800
>
>> @@ -3002,7 +3002,7 @@ static inline u32 bond_eth_hash(struct sk_buff *skb)
>>   	struct ethhdr *data = (struct ethhdr *)skb->data;
>>   
>>   	if (skb_headlen(skb) >= offsetof(struct ethhdr, h_proto))
>> -		return data->h_dest[5] ^ data->h_source[5];
>> +		return data->h_dest[5] ^ data->h_source[5] ^ data->h_proto;
>>   
>>   	return 0;
>>   }
> About the headlen check, I don't like the idea that the hash depends upon
> whether we have a fully fragmented packet or not.
>
> Just use the appropriate interface, skb_header_pointer(), and recode this
> as:
>
> 	struct ethhdr *ep, _hdr;
>
> 	ep = skb_header_pointer(skb, 0, sizeof(_hdr), &_hdr);
> 	if (ep)
> 		return ep->h_dest[5] ^ ep->h_source[5] ^ ep->h_proto;
> 	return 0;
Many thanks, patch v2 is coming.

Best Regards,
Jianhua

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