[dpdk-dev] [PATCH v3 0/7] add packed ring vectorized datapath

[Marvin Liu]

This patch set introduced vectorized datapath for packed ring.

The size of packed ring descriptor is 16Bytes. Four batched descriptors
are just placed into one cacheline. AVX512 instructions can well handle
this kind of data. Packed ring TX datapath can fully transformed into
vectorized datapath. Rx datapath also can be vectorized when features
limiated(LRO and mergable disabled). User can specify whether disable
vectorized packed ring datapath by 'packed_vec' parameter of virtio user
vdev.

v3:
1. Remove virtio_net_hdr array for better performance
2. disable 'packed_vec' by default

v2:
1. more function blocks replaced by vector instructions
2. clean virtio_net_hdr by vector instruction
3. allow header room size change
4. add 'packed_vec' option in virtio_user vdev 
5. fix build not check whether AVX512 enabled
6. doc update

Marvin Liu (7):
  net/virtio: add Rx free threshold setting
  net/virtio-user: add vectorized packed ring parameter
  net/virtio: add vectorized packed ring Rx function
  net/virtio: reuse packed ring xmit functions
  net/virtio: add vectorized packed ring Tx datapath
  net/virtio: add election for vectorized datapath
  doc: add packed vectorized datapath

 .../nics/features/virtio-packed_vec.ini       |  22 +
 .../{virtio_vec.ini => virtio-split_vec.ini}  |   2 +-
 doc/guides/nics/virtio.rst                    |  44 +-
 drivers/net/virtio/Makefile                   |  28 +
 drivers/net/virtio/meson.build                |  11 +
 drivers/net/virtio/virtio_ethdev.c            |  43 +-
 drivers/net/virtio/virtio_ethdev.h            |   6 +
 drivers/net/virtio/virtio_pci.h               |   2 +
 drivers/net/virtio/virtio_rxtx.c              | 201 ++----
 drivers/net/virtio/virtio_rxtx_packed_avx.c   | 637 ++++++++++++++++++
 drivers/net/virtio/virtio_user_ethdev.c       |  27 +-
 drivers/net/virtio/virtqueue.h                | 165 ++++-
 12 files changed, 1006 insertions(+), 182 deletions(-)
 create mode 100644 doc/guides/nics/features/virtio-packed_vec.ini
 rename doc/guides/nics/features/{virtio_vec.ini => virtio-split_vec.ini} (88%)
 create mode 100644 drivers/net/virtio/virtio_rxtx_packed_avx.c

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2.17.1