[PATCH v10 00/18] virtio-net RSS/hash report fixes and improvements

[Akihiko Odaki]

This series contains fixes and improvements for virtio-net RSS and hash
reporting feature.

V7 -> V8:
  Reset author email addresses.
  Rebased.

V6 -> V7:
  Dropped patch "virtio-net: Do not clear VIRTIO_NET_F_HASH_REPORT".
  Dropped the changes to remove packet flags.
  Re-introduced tap_receive() and changed it to call tap_receive_iov().
  Removed tap_get_vnet_hdr_len().
  Fixed tap initialization not to call tap_fd_set_vnet_hdr_len() for tap
  without virtio-net header.
  Changed to call error_report() instead of warn_report() for
  programming errors.

V5 -> V6:
  Corrected the message for patch "virtio-net: Return an error when vhost
  cannot enable RSS".
  Removed changes to introduce asserts from "virtio-net: Return an error
  when vhost cannot enable RSS".
  Reorganized patches "virtio-net: Return an error when vhost cannot
  enable RSS" and "virtio-net: Do not clear VIRTIO_NET_F_RSS". This
  version now contains patches "virtio-net: Return an error when vhost
  cannot enable RSS" and "virtio-net: Enable software RSS".
  Rebased.

V4 -> V5:
  Added patch "virtio-net: Do not write hashes to peer buffer".

V3 -> V4:
  Extract patches "tap: Remove tap_receive()" and  "net: Remove flag
  propagation" from "net: Remove receive_raw()".
  Added patch "virtio-net: Always set populate_hash".
  Added patch "virtio-net: Do not clear VIRTIO_NET_F_HASH_REPORT".
  Added patch "ebpf: Use standard section name".
  Added patch "ebpf: Simplify error handling".
  Added patch "ebpf: Return 0 when configuration fails".
  Added patch "ebpf: Refactor tun_rss_steering_prog()".
  Added patch "ebpf: Add a separate target for skeleton".

V2 -> V3:
  Added patch "tap: Remove tap_probe_vnet_hdr_len()".
  Added patch "tap: Remove qemu_using_vnet_hdr()".
  Added patch "net: Move virtio-net header length assertion".
  Added patch "net: Remove receive_raw()".
  Added patch "tap: Shrink zeroed virtio-net header".
  Dropped patch "tap: Fix virtio-net header buffer size".

V1 -> V2:
  Added patch "ebpf: Fix RSS error handling".

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
Changes in v10:
- Dropped an obsolete statement of patch "virtio-net: Do not write
  hashes to peer buffer". (Yuri Benditovich)
- Dropped patch "virtio-net: Return an error when vhost cannot enable
  RSS" and "virtio-net: Report RSS warning at device realization".
- Link to v9: 
20240403-rss-v9-0-c6d87e69d38b@daynix.com">https://lore.kernel.org/r/20240403-rss-v9-0-c6d87e69d38b@daynix.com

Changes in v9:
- Added patch "virtio-net: Do not propagate ebpf-rss-fds errors".
- Added patch "virtio-net: Shrink header byte swapping buffer".
- Rebased.
- Link to v8: 
https://lore.kernel.org/r/20231210-rss-v8-0-9553ee714d38@daynix.com

---
Akihiko Odaki (18):
      tap: Remove tap_probe_vnet_hdr_len()
      tap: Remove qemu_using_vnet_hdr()
      net: Move virtio-net header length assertion
      net: Remove receive_raw()
      tap: Call tap_receive_iov() from tap_receive()
      tap: Shrink zeroed virtio-net header
      virtio-net: Do not propagate ebpf-rss-fds errors
      virtio-net: Add only one queue pair when realizing
      virtio-net: Copy header only when necessary
      virtio-net: Shrink header byte swapping buffer
      virtio-net: Disable RSS on reset
      virtio-net: Unify the logic to update NIC state for RSS
      virtio-net: Always set populate_hash
      virtio-net: Do not write hashes to peer buffer
      ebpf: Fix RSS error handling
      ebpf: Return 0 when configuration fails
      ebpf: Refactor tun_rss_steering_prog()
      ebpf: Add a separate target for skeleton

 ebpf/rss.bpf.skeleton.h  | 1558 +++++++++++++++++++++++-----------------------
 include/net/net.h        |    8 -
 net/tap_int.h            |    1 -
 hw/net/e1000e.c          |    1 -
 hw/net/igb.c             |    1 -
 hw/net/net_tx_pkt.c      |    4 +-
 hw/net/virtio-net.c      |  264 ++++----
 hw/net/vmxnet3.c         |    2 -
 net/dump.c               |    4 +-
 net/net.c                |   47 +-
 net/netmap.c             |    5 -
 net/tap-bsd.c            |    5 -
 net/tap-linux.c          |   20 -
 net/tap-solaris.c        |    5 -
 net/tap-stub.c           |    5 -
 net/tap.c                |   77 +--
 tools/ebpf/rss.bpf.c     |   44 +-
 tools/ebpf/Makefile.ebpf |   15 +-
 18 files changed, 948 insertions(+), 1118 deletions(-)
---
base-commit: e5c6528dce86d7a9ada7ecf02fcb7b8560955131
change-id: 20231210-rss-e7c98e722253

Best regards,
-- 
Akihiko Odaki <akihiko.odaki@daynix.com>