[pull request][net-next V2 00/15] mlx5 socket direct

[Saeed Mahameed <saeed@kernel.org>]

From: Saeed Mahameed <saeedm@nvidia.com>

Support Socket-Direct multi-dev netdev.

V1:
- https://lore.kernel.org/netdev/20231221005721.186607-1-saeed@kernel.org/

V2:
- Add documentation in a new patch.
- Add debugfs in a new patch.
- Add mlx5_ifc bit for MPIR cap check and use it before query.

For more information please see tag log below.

Please pull and let me know if there is any problem.

Thanks,
Saeed.


The following changes since commit 1701940b1a02addc8fe445538442112e84270b02:

  Merge branch 'tools-net-ynl-add-features-for-tc-family' (2024-01-31 21:19:22 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git tags/mlx5-socket-direct-v2

for you to fetch changes up to 1bf74fd7f25345fa46cd8e7c44c0b39c62bea119:

  Documentation: net/mlx5: Add description for Socket-Direct netdev combining (2024-02-01 00:08:06 -0800)

----------------------------------------------------------------
mlx5-socket-direct-v2

Support Socket-Direct multi-dev netdev

This series adds support for combining multiple devices (PFs) of the
same port under one netdev instance. Passing traffic through different
devices belonging to different NUMA sockets saves cross-numa traffic and
allows apps running on the same netdev from different numas to still
feel a sense of proximity to the device and acheive improved
performance.

We acheive this by grouping PFs together, and creating the netdev only
once all group members are probed. Symmetrically, we destroy the netdev
once any of the PFs is removed.

The channels are distributed between all devices, a proper configuration
would utilize the correct close numa when working on a certain app/cpu.

We pick one device to be a primary (leader), and it fills a special
role.  The other devices (secondaries) are disconnected from the network
in the chip level (set to silent mode). All RX/TX traffic is steered
through the primary to/from the secondaries.

Currently, we limit the support to PFs only, and up to two devices
(sockets).

----------------------------------------------------------------
Tariq Toukan (15):
      net/mlx5: Add MPIR bit in mcam_access_reg
      net/mlx5: SD, Introduce SD lib
      net/mlx5: SD, Implement basic query and instantiation
      net/mlx5: SD, Implement devcom communication and primary election
      net/mlx5: SD, Implement steering for primary and secondaries
      net/mlx5: SD, Add informative prints in kernel log
      net/mlx5: SD, Add debugfs
      net/mlx5e: Create single netdev per SD group
      net/mlx5e: Create EN core HW resources for all secondary devices
      net/mlx5e: Let channels be SD-aware
      net/mlx5e: Support cross-vhca RSS
      net/mlx5e: Support per-mdev queue counter
      net/mlx5e: Block TLS device offload on combined SD netdev
      net/mlx5: Enable SD feature
      Documentation: net/mlx5: Add description for Socket-Direct netdev combining

 .../device_drivers/ethernet/mellanox/mlx5/sd.rst   | 134 ++++++
 drivers/net/ethernet/mellanox/mlx5/core/Makefile   |   2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en.h       |   9 +-
 .../net/ethernet/mellanox/mlx5/core/en/channels.c  |  10 +-
 .../net/ethernet/mellanox/mlx5/core/en/channels.h  |   6 +-
 .../ethernet/mellanox/mlx5/core/en/monitor_stats.c |  48 +-
 .../net/ethernet/mellanox/mlx5/core/en/params.c    |   9 +-
 .../net/ethernet/mellanox/mlx5/core/en/params.h    |   3 -
 drivers/net/ethernet/mellanox/mlx5/core/en/ptp.c   |  12 +-
 drivers/net/ethernet/mellanox/mlx5/core/en/qos.c   |   8 +-
 .../ethernet/mellanox/mlx5/core/en/reporter_rx.c   |   4 +-
 .../ethernet/mellanox/mlx5/core/en/reporter_tx.c   |   3 +-
 drivers/net/ethernet/mellanox/mlx5/core/en/rqt.c   | 123 ++++-
 drivers/net/ethernet/mellanox/mlx5/core/en/rqt.h   |   9 +-
 drivers/net/ethernet/mellanox/mlx5/core/en/rss.c   |  17 +-
 drivers/net/ethernet/mellanox/mlx5/core/en/rss.h   |   4 +-
 .../net/ethernet/mellanox/mlx5/core/en/rx_res.c    |  62 ++-
 .../net/ethernet/mellanox/mlx5/core/en/rx_res.h    |   1 +
 drivers/net/ethernet/mellanox/mlx5/core/en/trap.c  |  11 +-
 .../net/ethernet/mellanox/mlx5/core/en/xsk/pool.c  |   6 +-
 .../net/ethernet/mellanox/mlx5/core/en/xsk/setup.c |   8 +-
 .../ethernet/mellanox/mlx5/core/en_accel/ktls.c    |   2 +-
 .../ethernet/mellanox/mlx5/core/en_accel/ktls.h    |   4 +-
 .../ethernet/mellanox/mlx5/core/en_accel/ktls_rx.c |   6 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c  | 176 +++++--
 drivers/net/ethernet/mellanox/mlx5/core/en_stats.c |  39 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c    |   4 +-
 .../net/ethernet/mellanox/mlx5/core/lib/devcom.h   |   1 +
 drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h |  12 +
 drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c   | 524 +++++++++++++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h   |  38 ++
 include/linux/mlx5/driver.h                        |   1 +
 include/linux/mlx5/mlx5_ifc.h                      |   4 +-
 33 files changed, 1127 insertions(+), 173 deletions(-)
 create mode 100644 Documentation/networking/device_drivers/ethernet/mellanox/mlx5/sd.rst
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/sd.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/sd.h