On Sat, Sep 25, 2010 at 12:27:18PM +0800, xiaohui.xin@xxxxxxxxx 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. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
