netdev - Re: [PATCH net-next] vxlan: distribute vxlan tunneled traffic across multiple TXQs

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Date:	Tue, 31 Dec 2013 13:56:36 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	stephen@...workplumber.org, sathya.perla@...lex.com,
	netdev@...r.kernel.org, edumazet@...gle.com
Subject: Re: [PATCH net-next] vxlan: distribute vxlan tunneled traffic
 across multiple TXQs

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 24 Dec 2013 10:39:06 -0800

> On Mon, 2013-12-23 at 11:28 -0800, Stephen Hemminger wrote:
> 
>> The idea is good, but without the destructor there is nothing to keep
>> the UDP socket from being destroyed while packet is being sent on another
>> CPU.
> 
> I see no requirement of holding a reference on the vxlan UDP socket in
> transmit path.

I'm trying to figure out how leaving a dangling socket attached to
skb->sk, as in this original patch, can be OK.

If skb->sk is there, anyone can reference it, and meanwhile anyone can
destroy and free it.

That's Stephens' objection.

Are you saying that we have something that allows this to be valid?
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