Merge tag 'mlx5-socket-direct-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux

Saeed Mahameed says:

====================
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).

* tag 'mlx5-socket-direct-v3' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux:
  Documentation: networking: Add description for multi-pf netdev
  net/mlx5: Enable SD feature
  net/mlx5e: Block TLS device offload on combined SD netdev
  net/mlx5e: Support per-mdev queue counter
  net/mlx5e: Support cross-vhca RSS
  net/mlx5e: Let channels be SD-aware
  net/mlx5e: Create EN core HW resources for all secondary devices
  net/mlx5e: Create single netdev per SD group
  net/mlx5: SD, Add debugfs
  net/mlx5: SD, Add informative prints in kernel log
  net/mlx5: SD, Implement steering for primary and secondaries
  net/mlx5: SD, Implement devcom communication and primary election
  net/mlx5: SD, Implement basic query and instantiation
  net/mlx5: SD, Introduce SD lib
  net/mlx5: Add MPIR bit in mcam_access_reg
====================

Link: https://lore.kernel.org/r/20240307084229.500776-1-saeed@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>