[PATCH net-next v13 0/4] ethtool: provide the dim profile fine-tuning channel

[Heng Qi <hengqi@linux.alibaba.com>]

The NetDIM library provides excellent acceleration for many modern
network cards. However, the default profiles of DIM limits its maximum
capabilities for different NICs, so providing a way which the NIC can
be custom configured is necessary.

Currently, the way is based on the commonly used "ethtool -C".

Please review, thank you very much!

Changelog
=====
v12->v13:
  - Rebase net-next to fix the one-line conflict.
  - Update tiny comments.
  - Config ETHTOOL_NETLINK to select DIMLIB.

v11->v12:
  - Remove the use of IS_ENABLED(DIMLIB).
  - Update Simon's htmldoc hint.

v10->v11:
  - Fix and clean up some issues from Kuba, thanks.
  - Rebase net-next/main

v9->v10:
  - Collect dim related flags/mode/work into one place.
  - Use rx_profile + tx_profile instead of four profiles.
  - Add several helps.
  - Update commit logs.

v8->v9:
  - Fix the compilation error of conflicting names of rx_profile in
    dim.h and ice driver: in dim.h, rx_profile is replaced with
    dim_rx_profile. So does tx_profile.

v7->v8:
  - Use kmemdup() instead of kzalloc()/memcpy() in dev_dim_profile_init().

v6->v7:
  - A new wrapper struct pointer is used in struct net_device.
  - Add IS_ENABLED(CONFIG_DIMLIB) to avoid compiler warnings.
  - Profile fields changed from u16 to u32.

v5->v6:
  - Place the profile in netdevice to bypass the driver.
    The interaction code of ethtool <-> kernel has not changed at all,
    only the interaction part of kernel <-> driver has changed.

v4->v5:
  - Update some snippets from Kuba.

v3->v4:
  - Some tiny updates and patch 1 only add a new comment.

v2->v3:
  - Break up the attributes to avoid the use of raw c structs.
  - Use per-device profile instead of global profile in the driver.

v1->v2:
  - Use ethtool tool instead of net-sysfs.

Heng Qi (4):
  linux/dim: move useful macros to .h file
  ethtool: provide customized dim profile management
  dim: add new interfaces for initialization and getting results
  virtio-net: support dim profile fine-tuning

 Documentation/netlink/specs/ethtool.yaml     |  31 +++
 Documentation/networking/ethtool-netlink.rst |   4 +
 Documentation/networking/net_dim.rst         |  42 +++
 drivers/net/virtio_net.c                     |  47 +++-
 include/linux/dim.h                          | 113 ++++++++
 include/linux/ethtool.h                      |   4 +-
 include/linux/netdevice.h                    |   3 +
 include/uapi/linux/ethtool_netlink.h         |  22 ++
 lib/dim/net_dim.c                            | 144 +++++++++-
 net/Kconfig                                  |   1 +
 net/ethtool/coalesce.c                       | 263 ++++++++++++++++++-
 11 files changed, 658 insertions(+), 16 deletions(-)

-- 
2.32.0.3.g01195cf9f