netdev - Re: [PATCH net-next V2 1/5] flow_dissector: For stripped vlan, get vlan info from skb->vlan

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Date:	Thu, 18 Aug 2016 09:24:59 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	Hadar Hen Zion <hadarh@...lanox.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Jiri Pirko <jiri@...lanox.com>,
	Amir Vadai <amirva@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Tom Herbert <tom@...bertland.com>
Subject: Re: [PATCH net-next V2 1/5] flow_dissector: For stripped vlan, get
 vlan info from skb->vlan_tci

Wed, Aug 17, 2016 at 12:36:10PM CEST, hadarh@...lanox.com 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 stripped vlan packets correctly.
>In some flows, vlan doesn't exist in skb->data anymore when applying
>flow dissection on the skb, fix that.
>
>In case vlan info wasn't stripped before applying flow_dissector (RPS
>flow for example), or in case of skb with multiple vlans (e.g. 802.1ad),
>get the vlan info from skb->data. The flow_dissector correctly skips
>any number of vlans and stores only the first level vlan.
>
>Fixes: 0744dd00c1b1 ('net: introduce skb_flow_dissect()')
>Signed-off-by: Hadar Hen Zion <hadarh@...lanox.com>

Acked-by: Jiri Pirko <jiri@...lanox.com>