[dpdk-dev] [PATCH v4 0/4] net/virtio: make virtqueue struct cache-friendly

[Maxime Coquelin <maxime.coquelin@redhat.com>]

This series optimizes the cache usage of virtqueue struct,
by making a "fake" mbuf being dynamically allocated in Rx
virtnet struct, by removing a useless virtuque pointer
into the virtnet structs and by moving a few fields
to pack holes.

With these 3 patches, the virtqueue struct size goes from
576 bytes (9 cachelines) to 248 bytes (4 cachelines).

Changes in v4:
==============
- Fix ARM build failure after rebase (0-day robot)
- Fix fake_mbuf freeing (David)
- Applied David R-by

Changes in v3:
==============
- Use rte_zmalloc_socket for fake mbuf alloc (David)
- Fix typos in commit messages
- Remove superfluous pointer check befor freeing (David)
- Fix checkpatch warnings

Changes in v2:
==============
- Rebase on latest main
- Improve error path in virtio_init_queue
- Fix various typos in commit messages

Maxime Coquelin (4):
  net/virtio: remove reference to virtqueue in vrings
  net/virtio: improve queue init error path
  net/virtio: allocate fake mbuf in Rx queue
  net/virtio: pack virtqueue struct

 drivers/net/virtio/virtio_ethdev.c            | 64 +++++++++++--------
 drivers/net/virtio/virtio_rxtx.c              | 37 +++++------
 drivers/net/virtio/virtio_rxtx.h              |  5 +-
 drivers/net/virtio/virtio_rxtx_packed.c       |  4 +-
 drivers/net/virtio/virtio_rxtx_packed.h       |  6 +-
 drivers/net/virtio/virtio_rxtx_packed_avx.h   |  4 +-
 drivers/net/virtio/virtio_rxtx_packed_neon.h  |  4 +-
 drivers/net/virtio/virtio_rxtx_simple.h       |  2 +-
 .../net/virtio/virtio_rxtx_simple_altivec.c   |  2 +-
 drivers/net/virtio/virtio_rxtx_simple_neon.c  |  2 +-
 drivers/net/virtio/virtio_rxtx_simple_sse.c   |  2 +-
 .../net/virtio/virtio_user/virtio_user_dev.c  |  4 +-
 drivers/net/virtio/virtio_user_ethdev.c       |  2 +-
 drivers/net/virtio/virtqueue.h                | 24 ++++---
 14 files changed, 87 insertions(+), 75 deletions(-)

-- 
2.29.2