netdev - Re: [PATCH net 1/2] macvlan: forbid L2 fowarding offload for macvtap

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Message-ID: <52CF9C0C.2020808@redhat.com>
Date:	Fri, 10 Jan 2014 15:06:52 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	John Fastabend <john.fastabend@...il.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Neil Horman <nhorman@...driver.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vlad Yasevich <vyasevic@...hat.com>
Subject: Re: [PATCH net 1/2] macvlan: forbid L2 fowarding offload for macvtap

On 01/10/2014 05:39 AM, Stephen Hemminger wrote:
> On Thu, 09 Jan 2014 16:55:07 +0800
> Jason Wang <jasowang@...hat.com> wrote:
>
>> What if use do want a qdisc and want to change the its queue length for
>> tun/macvlan? And the the name tx_queue_length is misleading. For tun it
>> may make sense since it was used in transmission path. For macvtap it
>> was not. So maybe what we need is just a new ioctl for both tun/macvtap
>> and a new feature flag. If user create the device with new feature flag,
>> the socket receive queue length could be changed by ioctl instead of
>> dev->tx_queue_length. If not, the old behaviour could be kept.
> The overloading of tx_queue_len in macvtap was the original design mistake.
> Can't this just be undone and expose rx_queue_len as sysfs attribute?

That works. But we current allow user to change the socket sndbuf
through TUNSNDBUF. Maybe we need a similar one for receive.
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