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net/mlx5e: psp: Make PSP steering config dynamic

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Only create PSP steering tables when PSP configuration is enabled on a
PSP device.

Previously, mlx5e_psp_set_config (== .set_config on the PSP device) did
nothing. Steering was created and hooked up to incoming traffic at
device initialization time, via mlx5e_init_nic_rx -> mlx5e_accel_init_rx
-> mlx5_accel_psp_fs_init_rx_tables. Similarly, TX tables were created
and hooked to egress traffic at mlx5e_init_nic_tx -> mlx5e_accel_init_tx
-> mlx5_accel_psp_fs_init_tx_tables

Doing this means both ingress and egress UDP packets go through the
PSP steering tables, causing extra latency and overhead.
A better solution is to let the incoming encrypted PSP packets get
dropped by SW and not impose an overhead on all UDP packets which have
to traverse the PSP steering rules when PSP isn't used.

Additionally, upcoming changes to support HW-GRO need to reconfigure PSP
steering dynamically and this patch is a necessary step in that
direction.

Two new functions are defined:
- accel_psp_fs_create: Creates steering tables and connects RX UDP v4/v6
  traffic to PSP RX tables.
- accel_psp_fs_destroy: Disconnects incoming RX traffic from PSP
  steering and destroys steering tables.

PSP steering cleanup, which happens independently from PSP device
configuration, is unchanged. When the device is going away, steering
tables are destroyed as well.

The netdev lock is now used for proper synchronization between the new
set_config flow and device steering init/cleanup. This will be important
in future patches, when PSP will be able to reconfigure itself
dynamically upon netdev feature changes.

Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20260707130858.969928-14-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Cosmin Ratiu 2026-07-07 16:08:56 +03:00 • committed by Jakub Kicinski
commit 1e6e0cec0d
3 changed files with 53 additions and 51 deletions
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