On Mon, 19 Oct 2015 16:28:30 +0000 "Xie, Huawei" <huawei.xie at intel.com> wrote:
> On 10/19/2015 1:16 PM, Stephen Hemminger wrote: > > Virtio supports a feature that allows sender to put transmit > > header prepended to data. It requires that the mbuf be writeable, correct > > alignment, and the feature has been negotiatied. If all this works out, > > then it will be the optimum way to transmit a single segment packet. > "When using legacy interfaces, transitional drivers which have not > negotiated VIRTIO_F_ANY_LAYOUT > MUST use a single descriptor for the struct virtio_net_hdr on both > transmit and receive, with the > network data in the following descriptors." The code checks for the any layout feature, what is the problem?