netdev - Re: [RFC net-next 0/2] net/sched: cls_flower, act

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Date:	Mon, 15 Aug 2016 06:41:14 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Shmulik Ladkani <shmulik.ladkani@...il.com>
Cc:	Amir Vadai <amir@...ai.me>, Jiri Pirko <jiri@...nulli.us>,
	Cong Wang <xiyou.wangcong@...il.com>,
	John Fastabend <john.fastabend@...il.com>,
	Jiri Pirko <jiri@...lanox.com>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Hadar Har-Zion <hadarh@...lanox.com>,
	Oded Shanoon <odeds@...lanox.com>,
	Amir Vadai <amirva@...lanox.com>
Subject: Re: [RFC net-next 0/2] net/sched: cls_flower, act_mirred: VXLAN
 redirect using TC

On 16-08-15 06:24 AM, Shmulik Ladkani wrote:
> On Mon, 15 Aug 2016 06:08:10 -0400, jhs@...atatu.com wrote:

>> Assuming $VXLAN is actually not a linux netdev of type vxlan?
>> then the action does vxlan encap redirect sends it to the $VXLAN
>> dev with encapsulation in place.
>
> I assume Amir refers to vxlan netdev in VXLAN_F_COLLECT_METADATA mode,
> using the tun_info metadata found in skb_metadata_dst.
> The action is supposed to assign the tun metadata.
>

I see - so you let the vxlan netdev do the encap?
Would it still scale to a _very large_ number of tunnels?
How many netdevs are you going to use? I am assuming you will hit
a nasty lock somewhere(qdisc?) if you use only one.

cheers,
jamal