[PATCH net-next 0/2] net/mlx5e: Align setdcbx with DCBX capability flags

[Tariq Toukan <tariqt@nvidia.com>]

Hi,

This series by Alexei aligns the mlx5e DCBX mode handling in the setdcbx
DCB callback with the DCBX capability flags.

Today mlx5e_dcbnl_setdcbx() applies two different policies: a request of
mode 0 switches the firmware to AUTO, while any other request is
accepted only if it carries DCB_CAP_DCBX_HOST. Requests with
DCB_CAP_DCBX_LLD_MANAGED are rejected outright, even though that flag
describes exactly the case where DCBX negotiation is done by the
firmware/LLD agent rather than by the host.

Patch 1 switches the firmware between HOST and AUTO modes based solely
on the DCB_CAP_DCBX_HOST bit, which folds the two code paths into one
and removes the dedicated switch-to-host helper. When moving to
firmware-controlled mode, CEE, IEEE and LLD_MANAGED are reported
together due to a firmware limitation.

Patch 2 drops the rejection of DCB_CAP_DCBX_LLD_MANAGED, so that
requesting it switches to firmware-controlled DCBX mode.

Regards,
Tariq

Alexei Lazar (2):
  net/mlx5e: Select DCBX HOST/AUTO from capability flags in setdcbx
  net/mlx5e: Add DCB_CAP_DCBX_LLD_MANAGED support in setdcbx

 .../ethernet/mellanox/mlx5/core/en_dcbnl.c    | 51 +++++--------------
 1 file changed, 14 insertions(+), 37 deletions(-)


base-commit: d8674294aefef02266c4d47ad10131f1bffbe534
-- 
2.44.0