netdev - [PATCH net-next 2/6] mlxsw: Enable string TLV usage according to MGIR output

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Date:   Thu, 19 Jan 2023 11:32:28 +0100
From:   Petr Machata <petrm@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, <netdev@...r.kernel.org>
CC:     Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>,
        "Amit Cohen" <amcohen@...dia.com>,
        Danielle Ratson <danieller@...dia.com>, <mlxsw@...dia.com>
Subject: [PATCH net-next 2/6] mlxsw: Enable string TLV usage according to MGIR output

From: Amit Cohen <amcohen@...dia.com>

String TLV is not supported by old firmware versions, therefore
'struct mlxsw_core' stores the field 'emad.enable_string_tlv', which is
set to true only after firmware version check.

Instead of assuming that firmware version check is enough to enable
string TLV, a better solution is to query if this TLV is supported from
MGIR register. Add such query and initialize 'emad.enable_string_tlv'
accordingly.

Signed-off-by: Amit Cohen <amcohen@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c    | 36 +++++++++++++++----
 drivers/net/ethernet/mellanox/mlxsw/core.h    |  2 --
 .../net/ethernet/mellanox/mlxsw/spectrum.c    |  1 -
 3 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index a0a06e2eff82..cb3715f1582b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -794,6 +794,28 @@ static const struct mlxsw_listener mlxsw_emad_rx_listener =
 	MLXSW_RXL(mlxsw_emad_rx_listener_func, ETHEMAD, TRAP_TO_CPU, false,
 		  EMAD, DISCARD);
 
+static int mlxsw_emad_tlv_enable(struct mlxsw_core *mlxsw_core)
+{
+	char mgir_pl[MLXSW_REG_MGIR_LEN];
+	bool string_tlv;
+	int err;
+
+	mlxsw_reg_mgir_pack(mgir_pl);
+	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgir), mgir_pl);
+	if (err)
+		return err;
+
+	string_tlv = mlxsw_reg_mgir_fw_info_string_tlv_get(mgir_pl);
+	mlxsw_core->emad.enable_string_tlv = string_tlv;
+
+	return 0;
+}
+
+static void mlxsw_emad_tlv_disable(struct mlxsw_core *mlxsw_core)
+{
+	mlxsw_core->emad.enable_string_tlv = false;
+}
+
 static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
 {
 	struct workqueue_struct *emad_wq;
@@ -824,10 +846,17 @@ static int mlxsw_emad_init(struct mlxsw_core *mlxsw_core)
 	if (err)
 		goto err_trap_register;
 
+	err = mlxsw_emad_tlv_enable(mlxsw_core);
+	if (err)
+		goto err_emad_tlv_enable;
+
 	mlxsw_core->emad.use_emad = true;
 
 	return 0;
 
+err_emad_tlv_enable:
+	mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_emad_rx_listener,
+				   mlxsw_core);
 err_trap_register:
 	destroy_workqueue(mlxsw_core->emad_wq);
 	return err;
@@ -840,6 +869,7 @@ static void mlxsw_emad_fini(struct mlxsw_core *mlxsw_core)
 		return;
 
 	mlxsw_core->emad.use_emad = false;
+	mlxsw_emad_tlv_disable(mlxsw_core);
 	mlxsw_core_trap_unregister(mlxsw_core, &mlxsw_emad_rx_listener,
 				   mlxsw_core);
 	destroy_workqueue(mlxsw_core->emad_wq);
@@ -3377,12 +3407,6 @@ bool mlxsw_core_sdq_supports_cqe_v2(struct mlxsw_core *mlxsw_core)
 }
 EXPORT_SYMBOL(mlxsw_core_sdq_supports_cqe_v2);
 
-void mlxsw_core_emad_string_tlv_enable(struct mlxsw_core *mlxsw_core)
-{
-	mlxsw_core->emad.enable_string_tlv = true;
-}
-EXPORT_SYMBOL(mlxsw_core_emad_string_tlv_enable);
-
 static int __init mlxsw_core_module_init(void)
 {
 	int err;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.h b/drivers/net/ethernet/mellanox/mlxsw/core.h
index e0a6fcbbcb19..a77cb0be7108 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.h
@@ -448,8 +448,6 @@ u32 mlxsw_core_read_utc_nsec(struct mlxsw_core *mlxsw_core);
 
 bool mlxsw_core_sdq_supports_cqe_v2(struct mlxsw_core *mlxsw_core);
 
-void mlxsw_core_emad_string_tlv_enable(struct mlxsw_core *mlxsw_core);
-
 bool mlxsw_core_res_valid(struct mlxsw_core *mlxsw_core,
 			  enum mlxsw_res_id res_id);
 
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index f5b2d965d476..3d15d3387aa2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3092,7 +3092,6 @@ static int mlxsw_sp_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->bus_info = mlxsw_bus_info;
 
 	mlxsw_sp_parsing_init(mlxsw_sp);
-	mlxsw_core_emad_string_tlv_enable(mlxsw_core);
 
 	err = mlxsw_sp_base_mac_get(mlxsw_sp);
 	if (err) {
-- 
2.39.0