netdev - Re: [PATCH net,v2] ipvlan: implement .parse_protocol hook function in ipvlan_header

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Date: Sat, 2 Dec 2023 10:14:02 +0800
From: shaozhengchao <shaozhengchao@...wei.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	<netdev@...r.kernel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
CC: <luwei32@...wei.com>, <fw@...len.de>, <maheshb@...gle.com>,
	<weiyongjun1@...wei.com>, <yuehaibing@...wei.com>
Subject: Re: [PATCH net,v2] ipvlan: implement .parse_protocol hook function in
 ipvlan_header_ops



On 2023/12/1 23:22, Willem de Bruijn wrote:
> shaozhengchao wrote:
>>
>>
>> On 2023/12/1 10:55, Zhengchao Shao wrote:
>>> The .parse_protocol hook function in the ipvlan_header_ops structure is
>>> not implemented. As a result, when the AF_PACKET family is used to send
>>> packets, skb->protocol will be set to 0.
>>> Ipvlan is a device of type ARPHRD_ETHER (ether_setup). Therefore, use
>>> eth_header_parse_protocol function to obtain the protocol.
>>>
>>> Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.")
>>
>> Maybe Fixes should be: 75c65772c3d1 ("net/packet: Ask driver for
>> protocol if not provided by user")
> 
Hi Willem:
> Definitely not anything older than the introduction of
> header_ops.parse_protocol.
> 
    Yes, I think so.
> I gave my +1 when it targeted net-next, so imho this is not really
> stable material anyhow.
   But, if skb->protocol = 0, no matter what type of packet it is, it
will be discarded directly in ipvlan_process_outbound().
So net branch will be OK? What I missed?
Thanks.

Zhengchao Shao