netdev - Re: [PATCH net-next 2/3] net: mpls: Fixups for GSO

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Date:   Mon, 22 Aug 2016 07:11:27 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        buytenh@...tstofly.org, ebiederm@...ssion.com,
        rshearma@...cade.com, tom@...bertland.com, tgraf@...g.ch,
        olivier.dugeon@...nge.com, alexander.duyck@...il.com,
        roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next 2/3] net: mpls: Fixups for GSO

On 8/22/16 6:21 AM, Simon Horman wrote:
>> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
>> index 1ecbd7715f6d..6d78f162a88b 100644
>> --- a/net/openvswitch/actions.c
>> +++ b/net/openvswitch/actions.c
>> @@ -167,6 +167,12 @@ static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
>>  		skb->mac_len);
>>  	skb_reset_mac_header(skb);
>>  
>> +	/* for GSO: set MPLS as network header and encapsulated protocol
>> +	 * header as inner network header
>> +	 */
>> +	skb_set_network_header(skb, skb->mac_len);
>> +	skb_set_inner_network_header(skb, skb->mac_len + MPLS_HLEN);
>> +
>>  	new_mpls_lse = (__be32 *)skb_mpls_header(skb);
>>  	*new_mpls_lse = mpls->mpls_lse;
> 
> Is the above calculation correct if push_mpls() is called multiple times?
> 

No. Does OVS support more than 1? I really need someone who is familiar with the OVS code to make sure it works for all use cases. e.g., set skb_set_inner_network_header() before pushing a series of MPLS labels.