[dpdk-dev] [PATCH v3 0/5] vhost add vectorized data path

[Marvin Liu <yong.liu@intel.com>]

Packed ring format is imported since virtio spec 1.1. All descriptors
are compacted into one single ring when packed ring format is on. It is
straight forward that ring operations can be accelerated by utilizing
SIMD instructions. 

This patch set will introduce vectorized data path in vhost library. If
vectorized option is on, operations like descs check, descs writeback,
address translation will be accelerated by SIMD instructions. On skylake
server, it can bring 6% performance gain in loopback case and around 4%
performance gain in PvP case.

Vhost application can choose whether using vectorized acceleration, just
like external buffer feature. If platform or ring format not support
vectorized function, vhost will fallback to use default batch function.
There will be no impact in current data path.

v3:
* rename vectorized datapath file
* eliminate the impact when avx512 disabled
* dynamically allocate memory regions structure
* remove unlikely hint for in_order

v2:
* add vIOMMU support
* add dequeue offloading
* rebase code

Marvin Liu (5):
  vhost: add vectorized data path
  vhost: reuse packed ring functions
  vhost: prepare memory regions addresses
  vhost: add packed ring vectorized dequeue
  vhost: add packed ring vectorized enqueue

 doc/guides/nics/vhost.rst           |   5 +
 doc/guides/prog_guide/vhost_lib.rst |  12 +
 drivers/net/vhost/rte_eth_vhost.c   |  17 +-
 lib/librte_vhost/meson.build        |  16 ++
 lib/librte_vhost/rte_vhost.h        |   1 +
 lib/librte_vhost/socket.c           |   5 +
 lib/librte_vhost/vhost.c            |  11 +
 lib/librte_vhost/vhost.h            | 239 +++++++++++++++++++
 lib/librte_vhost/vhost_user.c       |  26 +++
 lib/librte_vhost/virtio_net.c       | 258 ++++-----------------
 lib/librte_vhost/virtio_net_avx.c   | 344 ++++++++++++++++++++++++++++
 11 files changed, 718 insertions(+), 216 deletions(-)
 create mode 100644 lib/librte_vhost/virtio_net_avx.c

-- 
2.17.1