From: "Michael S. Tsirkin" <mst@redhat.com>
To: xiaohui.xin@intel.com
Cc: netdev@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, mingo@elte.hu, davem@davemloft.net,
herbert@gondor.hengli.com.au, jdike@linux.intel.com
Subject: Re: [PATCH v11 00/17] Provide a zero-copy method on KVM virtio-net.
Date: Sun, 26 Sep 2010 19:01:42 +0200 [thread overview]
Message-ID: <20100926170142.GA24196@redhat.com> (raw)
In-Reply-To: <1285388855-27410-1-git-send-email-xiaohui.xin@intel.com>
On Sat, Sep 25, 2010 at 12:27:18PM +0800, xiaohui.xin@intel.com wrote:
> We provide an zero-copy method which driver side may get external
> buffers to DMA. Here external means driver don't use kernel space
> to allocate skb buffers. Currently the external buffer can be from
> guest virtio-net driver.
>
> The idea is simple, just to pin the guest VM user space and then
> let host NIC driver has the chance to directly DMA to it.
> The patches are based on vhost-net backend driver. We add a device
> which provides proto_ops as sendmsg/recvmsg to vhost-net to
> send/recv directly to/from the NIC driver. KVM guest who use the
> vhost-net backend may bind any ethX interface in the host side to
> get copyless data transfer thru guest virtio-net frontend.
> patch 01-10: net core and kernel changes.
> patch 11-13: new device as interface to mantpulate external buffers.
> patch 14: for vhost-net.
> patch 15: An example on modifying NIC driver to using napi_gro_frags().
> patch 16: An example how to get guest buffers based on driver
> who using napi_gro_frags().
> patch 17: It's a patch to address comments from Michael S. Thirkin
> to add 2 new ioctls in mp device.
> We split it out here to make easier reiewer.
I commented on how to avoid mm semaphore on data path separately, and
since you didn't have time to review that yet, I won't repeat that here.
At this point what are the plans on macvtap integration?
You indicated this is the interface you intend to use longterm.
next prev parent reply other threads:[~2010-09-26 17:01 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-25 4:27 [PATCH v11 00/17] Provide a zero-copy method on KVM virtio-net xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 01/17] Add a new structure for skb buffer from external xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 02/17] Add a new struct for device to manipulate external buffer xiaohui.xin
2010-09-27 13:41 ` Ben Hutchings
2010-09-25 4:27 ` [PATCH v11 03/17] Add a ndo_mp_port_prep pointer to net_device_ops xiaohui.xin
2010-09-27 13:42 ` Ben Hutchings
2010-09-29 13:41 ` Xin, Xiaohui
2010-09-25 4:27 ` [PATCH v11 04/17]Add a function make external buffer owner to query capability xiaohui.xin
2010-09-27 13:45 ` Ben Hutchings
2010-09-25 4:27 ` [PATCH v11 05/17] Add a function to indicate if device use external buffer xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 06/17]Use callback to deal with skb_release_data() specially xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 07/17] Modify netdev_alloc_page() to get external buffer xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 08/17] Modify netdev_free_page() to release " xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 09/17] Don't do skb recycle, if device use " xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 10/17] Add a hook to intercept external buffers from NIC driver xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 11/17] Add header file for mp device xiaohui.xin
2010-09-27 13:55 ` Ben Hutchings
2010-09-25 4:27 ` [PATCH v11 12/17] Add a kconfig entry and make entry " xiaohui.xin
2010-09-27 13:56 ` Ben Hutchings
2010-09-29 13:39 ` Xin, Xiaohui
2010-09-25 4:27 ` [PATCH v11 13/17] Add mp(mediate passthru) device xiaohui.xin
2010-09-27 21:23 ` Ben Hutchings
2010-09-28 13:06 ` Michael S. Tsirkin
2010-09-28 14:39 ` Arnd Bergmann
2010-09-28 14:43 ` Michael S. Tsirkin
2010-09-28 15:18 ` Arnd Bergmann
2010-09-28 18:48 ` Sridhar Samudrala
2010-09-29 13:38 ` Xin, Xiaohui
2010-09-25 4:27 ` [PATCH v11 14/17]Provides multiple submits and asynchronous notifications xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 15/17]An example how to modifiy NIC driver to use napi_gro_frags() interface xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 16/17]An example how to alloc user buffer based on " xiaohui.xin
2010-09-25 4:27 ` [PATCH v11 17/17]add two new ioctls for mp device xiaohui.xin
2010-09-27 21:36 ` Ben Hutchings
2010-09-28 13:09 ` Michael S. Tsirkin
2010-09-28 9:48 ` Michael S. Tsirkin
2010-09-29 9:36 ` xiaohui.xin
2010-09-26 17:01 ` Michael S. Tsirkin [this message]
2010-09-27 0:44 ` [PATCH v11 00/17] Provide a zero-copy method on KVM virtio-net Xin, Xiaohui
2010-09-28 1:25 ` Xin, Xiaohui
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