From: "Michael S. Tsirkin" <mst@redhat.com>
To: Herbert Xu <herbert@gondor.hengli.com.au>
Cc: "Xin, Xiaohui" <xiaohui.xin@intel.com>,
Stephen Hemminger <shemminger@vyatta.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"davem@davemloft.net" <davem@davemloft.net>,
"jdike@linux.intel.com" <jdike@linux.intel.com>,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [RFC PATCH v7 01/19] Add a new structure for skb buffer from external.
Date: Sun, 20 Jun 2010 14:47:19 +0300 [thread overview]
Message-ID: <20100620114719.GC5285@redhat.com> (raw)
In-Reply-To: <20100620113609.GA31693@gondor.apana.org.au>
On Sun, Jun 20, 2010 at 09:36:09PM +1000, Herbert Xu wrote:
> On Sun, Jun 20, 2010 at 02:11:24PM +0300, Michael S. Tsirkin wrote:
> >
> > Rather than modifying all guests, it seems much easier not to assume
> > specific buffer layout in host. Copying network header around seems a
> > small cost.
>
> Well sure we can debate the specifics of this implementation detail.
Let's do this then. So far the virtio spec avoided making layout
assumptions, leaving guests lay out data as they see fit.
Isn't it possible to keep supporting this with zero copy for hardware
that can issue DMA at arbitrary addresses?
> However, the fact that virtio_net doesn't support feature renegotiation
> on live migration is not a valid reason against this.
>
> Cheers,
--
MST
next prev parent reply other threads:[~2010-06-20 11:52 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-05 10:14 [RFC PATCH v7 01/19] Add a new structure for skb buffer from external xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 02/19] Add a new struct for device to manipulate external buffer xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 03/19] Export 2 func for device to assign/deassign new strucure xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 04/19] Add a ndo_mp_port_prep pointer to net_device_ops xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 05/19] Add a function make external buffer owner to query capability xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 06/19] Add a function to indicate if device use external buffer xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 07/19] Add interface to get external buffers xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 08/19] Make __alloc_skb() to get external buffer xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 09/19] Ignore room skb_reserve() when device is using " xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 10/19] Don't do skb recycle, if device use " xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 11/19] Use callback to deal with skb_release_data() specially xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 12/19] Add a hook to intercept external buffers from NIC driver xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 13/19] To skip GRO if buffer is external currently xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 14/19] Add header file for mp device xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 15/19] Add basic funcs and ioctl to " xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 16/19] Manipulate external buffers in " xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 17/19] Export proto_ops to vhost-net driver xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 18/19] Add a kconfig entry and make entry for mp device xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 19/19] Provides multiple submits and asynchronous notifications xiaohui.xin
2010-06-05 10:14 ` [RFC PATCH v7 00/19] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-06-05 14:56 ` [RFC PATCH v7 11/19] Use callback to deal with skb_release_data() specially Eric Dumazet
2010-06-09 7:30 ` Xin, Xiaohui
2010-06-05 14:53 ` [RFC PATCH v7 08/19] Make __alloc_skb() to get external buffer Eric Dumazet
2010-06-09 7:34 ` Xin, Xiaohui
2010-06-05 14:51 ` [RFC PATCH v7 03/19] Export 2 func for device to assign/deassign new strucure Eric Dumazet
2010-06-06 23:13 ` [RFC PATCH v7 01/19] Add a new structure for skb buffer from external Stephen Hemminger
2010-06-07 7:51 ` Andi Kleen
2010-06-07 8:17 ` Mitchell Erblich
2010-06-09 9:22 ` Xin, Xiaohui
2010-06-09 8:48 ` Xin, Xiaohui
2010-06-08 5:27 ` Herbert Xu
2010-06-09 9:54 ` Xin, Xiaohui
2010-06-11 5:21 ` Herbert Xu
2010-06-12 9:31 ` Xin, Xiaohui
2010-06-13 8:58 ` Xin, Xiaohui
2010-06-17 11:21 ` Herbert Xu
2010-06-18 5:26 ` Xin, Xiaohui
2010-06-18 5:59 ` Herbert Xu
2010-06-18 7:14 ` Xin, Xiaohui
2010-06-18 7:45 ` Herbert Xu
2010-06-20 10:06 ` Michael S. Tsirkin
2010-06-20 10:32 ` Herbert Xu
2010-06-20 10:39 ` Michael S. Tsirkin
2010-06-20 11:02 ` Herbert Xu
2010-06-20 11:11 ` Michael S. Tsirkin
2010-06-20 11:36 ` Herbert Xu
2010-06-20 11:47 ` Michael S. Tsirkin [this message]
2010-06-20 11:59 ` Herbert Xu
2010-06-20 12:48 ` Michael S. Tsirkin
2010-06-20 15:19 ` Ben Hutchings
2010-06-23 8:09 ` Dong, Eddie
2010-06-23 9:52 ` Herbert Xu
2010-06-23 10:05 ` Dong, Eddie
2010-06-24 10:08 ` Herbert Xu
2010-06-25 1:03 ` Dong, Eddie
2010-06-25 11:06 ` Michael S. Tsirkin
2010-06-27 6:14 ` Herbert Xu
2010-06-28 9:56 ` Xin, Xiaohui
2010-06-28 10:00 ` Michael S. Tsirkin
2010-07-03 9:12 ` Herbert Xu
2010-06-25 2:07 ` Xin, Xiaohui
2010-06-17 11:20 ` Herbert Xu
2010-06-09 8:29 ` Xin, Xiaohui
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