[net-next,v9,0/4] ethtool: provide the dim profile fine-tuning channel

Message

Heng Qi April 17, 2024, 3:55 p.m. UTC

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, interaction with the driver is still based on the commonly
used "ethtool -C".

Since the profile now exists in netdevice, adding a function similar
to net_dim_get_rx_moderation_dev() with netdevice as argument is
nice, but this would be better along with cleaning up the rest of
the drivers, which we can get to very soon after this set.

Please review, thank you very much!

Changelog
=====
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, Thanks.

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
  virtio-net: refactor dim initialization/destruction
  virtio-net: support dim profile fine-tuning

 Documentation/netlink/specs/ethtool.yaml     |  33 +++
 Documentation/networking/ethtool-netlink.rst |   8 +
 drivers/net/virtio_net.c                     |  46 +++--
 include/linux/dim.h                          |  13 ++
 include/linux/ethtool.h                      |  11 +-
 include/linux/netdevice.h                    |  24 +++
 include/uapi/linux/ethtool_netlink.h         |  24 +++
 lib/dim/net_dim.c                            |  18 +-
 net/core/dev.c                               |  79 ++++++++
 net/ethtool/coalesce.c                       | 201 ++++++++++++++++++-
 10 files changed, 430 insertions(+), 27 deletions(-)