[PATCH v7 00/19] virtio-net RSS/hash report fixes and improvements

[Akihiko Odaki]

Based-on: <20230524064704.47711-1-akihiko.odaki@daynix.com>
("[PATCH 0/2] net: Update MemReentrancyGuard for NIC")

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

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".

Akihiko Odaki (19):
  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: Copy header only when necessary
  virtio-net: Disable RSS on reset
  virtio-net: Unify the logic to update NIC state for RSS
  virtio-net: Return an error when vhost cannot enable RSS
  virtio-net: Report RSS warning at device realization
  virtio-net: Always set populate_hash
  virtio-net: Do not write hashes to peer buffer
  ebpf: Fix RSS error handling
  ebpf: Use standard section name
  ebpf: Simplify 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  | 1557 +++++++++++++++++++-------------------
 include/net/net.h        |    8 -
 net/tap_int.h            |    1 -
 ebpf/ebpf_rss.c          |   12 +-
 hw/net/e1000e.c          |    1 -
 hw/net/igb.c             |    1 -
 hw/net/net_tx_pkt.c      |    4 +-
 hw/net/virtio-net.c      |  308 ++++----
 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     |   46 +-
 tools/ebpf/Makefile.ebpf |   15 +-
 19 files changed, 986 insertions(+), 1137 deletions(-)

-- 
2.42.1