[pull request][net-next V5 00/15] mlx5 socket direct (Multi-PF)

[Saeed Mahameed <saeed@kernel.org>]

From: Saeed Mahameed <saeedm@nvidia.com>

Support Socket-Direct multi-dev netdev.

V5:
 - Address documentation comments from Przemek Kitszel.

V4:
- Improve documentation for better user observability and understanding
  of the feature, in terms of queues and their expected NUMA/CPU/IRQ
  affinity.

V3:
- Fix documentation per Jakubs feedback.
- Fix typos
- Link new documentation in the networking index.rst

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 4166204d7ec26aee3d1f26847e88e4e41841fbe3:

  net: tap: Remove generic .ndo_get_stats64 (2024-03-05 18:32:33 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git tags/mlx5-socket-direct-v3

for you to fetch changes up to 23d8025212973dc6a42a341e550a8907bf7ede4a:

  Documentation: networking: Add description for multi-pf netdev (2024-03-05 18:59:33 -0800)

----------------------------------------------------------------
Support Multi-PF netdev (Socket Direct)

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 achieve improved
performance.

We achieve 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).

V5:
 - Address documentation comments from Przemek Kitszel.

V4:
 - Improve documentation for better user observability and understanding
   of the feature, in terms of queues and their expected NUMA/CPU/IRQ
   affinity.

V3:
 - Fix documentation per Jakubs feedback.
 - Fix typos
 - Link new documentation in the networking index.rst

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.

----------------------------------------------------------------
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: networking: Add description for multi-pf netdev

 Documentation/networking/index.rst                 |   1 +
 Documentation/networking/multi-pf-netdev.rst       | 174 +++++++
 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 +-
 34 files changed, 1168 insertions(+), 173 deletions(-)
 create mode 100644 Documentation/networking/multi-pf-netdev.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