[PATCH net 2/3] net/mlx5e: Validate 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 ETS traffic classes.

Reject ETS configurations that specify non-zero bandwidth for traffic
classes.

Fixes: 08fb1dacdd76 ("net/mlx5e: Support DCBNL IEEE ETS")
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 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
index 762f0a46c120..e4161603cdc0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
@@ -324,6 +324,17 @@ static int mlx5e_dbcnl_validate_ets(struct net_device *netdev,
 		}
 	}
 
+	/* Validate Non ETS BW */
+	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
+		if (ets->tc_tsa[i] != IEEE_8021QAZ_TSA_ETS &&
+		    ets->tc_tx_bw[i]) {
+			netdev_err(netdev,
+				   "Failed to validate ETS: tc=%d BW is not 0 for non-ETS TC (tsa=%u, bw=%u)\n",
+				   i, ets->tc_tsa[i], ets->tc_tx_bw[i]);
+			return -EINVAL;
+		}
+	}
+
 	/* Validate Bandwidth Sum */
 	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
 		if (ets->tc_tsa[i] == IEEE_8021QAZ_TSA_ETS) {
-- 
2.44.0