net/mlx5e: Read ETS settings directly from firmware

Issue description:
Current implementation saves the ETS settings from user in
a temporal soft copy and returns this settings when user
queries the ETS settings.

With the new DCBX firmware, the ETS settings can be changed
by firmware when the DCBX is in firmware controlled mode. Therefore,
user will obtain wrong values from the temporal soft copy.

Solution:
1. Read the ETS settings directly from firmware.
2. For tc_tsa:
   a. Initialize tc_tsa to vendor IEEE_8021QAZ_TSA_VENDOR at netdev
      creation.
   b. When reading ETS setting from FW, if the traffic class bandwidth
      is less than 100, set tc_tsa to IEEE_8021QAZ_TSA_ETS. This
      implementation solves the scenarios when the DCBX is in FW control
      and willing bit is on which means the ETS setting is dictated
      by remote switch.

Also check ETS capability where needed.

Signed-off-by: Huy Nguyen <huyn@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 31387ed9113b..60aa13b2b21f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -214,9 +214,6 @@ struct mlx5e_params {
 	u8  toeplitz_hash_key[40];
 	u32 indirection_rqt[MLX5E_INDIR_RQT_SIZE];
 	bool vlan_strip_disable;
-#ifdef CONFIG_MLX5_CORE_EN_DCB
-	struct ieee_ets ets;
-#endif
 	bool rx_am_enabled;
 	u32 lro_timeout;
 };
@@ -238,6 +235,9 @@ enum {
 
 struct mlx5e_dcbx {
 	struct mlx5e_cee_config    cee_cfg; /* pending configuration */
+
+	/* The only setting that cannot be read from FW */
+	u8                         tc_tsa[IEEE_8021QAZ_MAX_TCS];
 };
 #endif