f689586bc0
The basic idea is to shadow the used ring update: update them into a local buffer first, and then flush them all to the virtio used vring at once in the end. And since we do avail ring reservation before enqueuing data, we would know which and how many descs will be used. Which means we could update the shadow used ring at the reservation time. It also introduce another slight advantage: we don't need access the desc->flag any more inside copy_mbuf_to_desc_mergeable(). Signed-off-by: Zhihong Wang <zhihong.wang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jianbo Liu <jianbo.liu@linaro.org> Tested-by: Maxime Coquelin <maxime.coquelin@redhat.com>
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