Hi all: This RFC implement packed ring layout. The code were tested with pmd implement by Jens at http://dpdk.org/ml/archives/dev/2018-January/089417.html. Minor change was needed for pmd codes to kick virtqueue since it assumes a busy polling backend. Test were done between localhost and guest. Testpmd (rxonly) in guest reports 2.4Mpps. Testpmd (txonly) repots about 2.1Mpps. Notes: The event suppression /indirect descriptor support is complied test only because of lacked driver support. Changes from V1: - Refactor vhost used elem code to avoid open coding on used elem - Event suppression support (compile test only). - Indirect descriptor support (compile test only). - Zerocopy support. - vIOMMU support. - SCSI/VSOCK support (compile test only). - Fix several bugs For simplicity, I don't implement batching or other optimizations. Please review. Thanks Jason Wang (8): vhost: move get_rx_bufs to vhost.c vhost: hide used ring layout from device vhost: do not use vring_used_elem vhost_net: do not explicitly manipulate vhost_used_elem vhost: vhost_put_user() can accept metadata type virtio: introduce packed ring defines vhost: packed ring support vhost: event suppression for packed ring drivers/vhost/net.c | 138 ++----- drivers/vhost/scsi.c | 62 +-- drivers/vhost/vhost.c | 818 ++++++++++++++++++++++++++++++++++--- drivers/vhost/vhost.h | 46 ++- drivers/vhost/vsock.c | 42 +- include/uapi/linux/virtio_config.h | 9 + include/uapi/linux/virtio_ring.h | 32 ++ 7 files changed, 921 insertions(+), 226 deletions(-) -- 2.7.4
