netdev - Re: [PATCH net-next 1/4] flow_dissector: Get vlan info from skb->vlan

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Message-ID: <CAJL1qvEncNo-10vd387jdLj2Y+Xc_-Ms7rKHU6bQh=QO43ic5w@mail.gmail.com>
Date:	Sun, 14 Aug 2016 17:58:53 +0300
From:	Hadar Hen Zion <hadarh@....mellanox.co.il>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:	Hadar Hen Zion <hadarh@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Jiri Pirko <jiri@...lanox.com>,
	Tom Herbert <tom@...bertland.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>
Subject: Re: [PATCH net-next 1/4] flow_dissector: Get vlan info from
 skb->vlan_tci instead of skb->data

On Fri, Aug 12, 2016 at 9:36 AM, Toshiaki Makita
<makita.toshiaki@....ntt.co.jp> wrote:
> On 2016/08/10 22:32, Hadar Hen Zion wrote:
>> Early in the datapath skb_vlan_untag function is called, stripped
>> the vlan from the skb and set skb->vlan_tci and skb->vlan_proto fields.
>>
>> The current dissection doesn't handle vlan packets correctly.  Vlan
>> doesn't exist in skb->data anymore when applying flow dissection on the
>> skb, fix that.
>
> RPS (and flow-dissector called in RPS) is performed before vlan-strip in
> __netif_receive_skb_core().

right, I'll fix it to v2.

> Also, in cases skb is tagged with multiple vlan headers (typical when
> using 802.1ad), the second level vlan tag is in skb->data.

Currently, flow_dissector doesn't support multiple vlan headers, only
one vlan_id field is present.
There aren't any flow_dissector "customers" yet for multiple vlan support.


> So I think you should handle both of skb->vlan_tci and skb->data cases.

Sure, will do it.


>
> Thanks,
> Toshiaki Makita
>
>