[PATCH net 1/3] net/mlx5e: Report zero bandwidth for non-ETS traffic classes

[Tariq Toukan <tariqt@nvidia.com>]

From: Alexei Lazar <alazar@nvidia.com>

The IEEE 802.1Qaz standard defines that bandwidth allocation percentages
only apply to Enhanced Transmission Selection (ETS) traffic classes.
For STRICT and VENDOR transmission selection algorithms, bandwidth
percentage values are not applicable.

Currently for non-ETS 100 bandwidth is being reported for all traffic
classes in the get operation due to hardware limitation, regardless of
their TSA type.

Fix this by reporting 0 for non-ETS traffic classes.

Fixes: 820c2c5e773d ("net/mlx5e: Read ETS settings directly from firmware")
Signed-off-by: Alexei Lazar <alazar@nvidia.com>
Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
index 4b86df6d5b9e..762f0a46c120 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
@@ -173,6 +173,13 @@ static int mlx5e_dcbnl_ieee_getets(struct net_device *netdev,
 	}
 	memcpy(ets->tc_tsa, priv->dcbx.tc_tsa, sizeof(ets->tc_tsa));
 
+	/* Report 0 for non ETS TSA */
+	for (i = 0; i < ets->ets_cap; i++) {
+		if (ets->tc_tx_bw[i] == MLX5E_MAX_BW_ALLOC &&
+		    priv->dcbx.tc_tsa[i] != IEEE_8021QAZ_TSA_ETS)
+			ets->tc_tx_bw[i] = 0;
+	}
+
 	return err;
 }
 
-- 
2.44.0