dd856dfcb9
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. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Acked-by: Huawei Xie <huawei.xie@intel.com>