When this feature has been negotiated, virtio driver will use descriptors in ring order: starting from offset 0 in the table, and wrapping around at the end of the table. Vhost devices will always use descriptors in the same order in which they have been made available. This can reduce virtio accesses to used ring. Based on updated virtio-spec, this series realized IN_ORDER prototype in virtio driver and vhost. Guo Zhi (5): vhost: reorder used descriptors in a batch vhost: announce VIRTIO_F_IN_ORDER support vhost_test: batch used buffer virtio: get desc id in order virtio: annouce VIRTIO_F_IN_ORDER support drivers/vhost/test.c | 15 +++++++++++- drivers/vhost/vhost.c | 44 ++++++++++++++++++++++++++++++++++-- drivers/vhost/vhost.h | 4 ++++ drivers/virtio/virtio_ring.c | 39 +++++++++++++++++++++++++------- 4 files changed, 91 insertions(+), 11 deletions(-) -- 2.17.1
