netdev - Re: [PATCH] tun: orphan an skb on tx

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Message-ID: <1271176838.16881.537.camel@edumazet-laptop>
Date:	Tue, 13 Apr 2010 18:40:38 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	Paul Moore <paul.moore@...com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>
Subject: Re: [PATCH] tun: orphan an skb on tx

Le mardi 13 avril 2010 à 17:36 +0200, Jan Kiszka a écrit :
> Michael S. Tsirkin wrote:
> > The following situation was observed in the field:
> > tap1 sends packets, tap2 does not consume them, as a result
> > tap1 can not be closed.
> 
> And before that, tap1 may not be able to send further packets to anyone
> else on the bridge as its TX resources were blocked by tap2 - that's
> what we saw in the field.
> 

After the patch, tap1 is able to flood tap2, and tap3/tap4 not able to
send one single frame. Is it OK ?

Back to the problem : tap1 cannot be closed.

Why ? because of refcounts ?

When a socket with inflight tx packets is closed, we dont block the
close, we only delay the socket freeing once all packets were delivered
and freed.



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