[net-next 10/10] net/mlx5: Use devlink region_snapshot parameter

[Saeed Mahameed <saeedm@mellanox.com>]

From: Alex Vesker <valex@mellanox.com>

This parameter enables capturing region snapshot of the crspace
during critical errors. The default value of this parameter is
disabled, it can be enabled using devlink param commands.
It is possible to configure during runtime and also driver init.

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
---
 .../net/ethernet/mellanox/mlx5/core/devlink.c | 49 +++++++++++++++++++
 .../ethernet/mellanox/mlx5/core/diag/crdump.c | 22 +++++++++
 .../ethernet/mellanox/mlx5/core/lib/mlx5.h    |  2 +
 3 files changed, 73 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index ec0ca690839e..4e33049096d0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -2,6 +2,7 @@
 /* Copyright (c) 2018, Mellanox Technologies inc. All rights reserved. */
 
 #include <devlink.h>
+#include "lib/mlx5.h"
 
 enum {
 	MLX5_DEVLINK_MPEGC_FIELD_SELECT_TX_OVERFLOW_DROP_EN = BIT(0),
@@ -288,6 +289,24 @@ static int mlx5_devlink_get_congestion_mode(struct devlink *devlink, u32 id,
 	return 0;
 }
 
+static int mlx5_devlink_get_crdump_snapshot(struct devlink *devlink, u32 id,
+					    struct devlink_param_gset_ctx *ctx)
+{
+	struct mlx5_core_dev *dev = devlink_priv(devlink);
+
+	ctx->val.vbool = mlx5_crdump_is_snapshot_enabled(dev);
+	return 0;
+}
+
+static int mlx5_devlink_set_crdump_snapshot(struct devlink *devlink, u32 id,
+					    struct devlink_param_gset_ctx *ctx,
+					    struct netlink_ext_ack *extack)
+{
+	struct mlx5_core_dev *dev = devlink_priv(devlink);
+
+	return mlx5_crdump_set_snapshot_enabled(dev, ctx->val.vbool);
+}
+
 enum mlx5_devlink_param_id {
 	MLX5_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 	MLX5_DEVLINK_PARAM_ID_CONGESTION_ACTION,
@@ -295,6 +314,11 @@ enum mlx5_devlink_param_id {
 };
 
 static const struct devlink_param mlx5_devlink_params[] = {
+	DEVLINK_PARAM_GENERIC(REGION_SNAPSHOT,
+			      BIT(DEVLINK_PARAM_CMODE_RUNTIME) |
+			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
+			      mlx5_devlink_get_crdump_snapshot,
+			      mlx5_devlink_set_crdump_snapshot, NULL),
 	DEVLINK_PARAM_DRIVER(MLX5_DEVLINK_PARAM_ID_CONGESTION_ACTION,
 			     "congestion_action",
 			     DEVLINK_PARAM_TYPE_STRING,
@@ -309,6 +333,29 @@ static const struct devlink_param mlx5_devlink_params[] = {
 			     mlx5_devlink_set_congestion_mode, NULL),
 };
 
+static void mlx5_devlink_set_init_value(struct devlink *devlink, u32 param_id,
+					union devlink_param_value init_val)
+{
+	struct mlx5_core_dev *dev = devlink_priv(devlink);
+	int err;
+
+	err = devlink_param_driverinit_value_set(devlink, param_id, init_val);
+	if (err)
+		dev_warn(&dev->pdev->dev,
+			 "devlink set parameter %u value failed (err = %d)",
+			 param_id, err);
+}
+
+static void mlx5_devlink_set_params_init_values(struct devlink *devlink)
+{
+	union devlink_param_value value;
+
+	value.vbool = false;
+	mlx5_devlink_set_init_value(devlink,
+				    DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT,
+				    value);
+}
+
 int mlx5_devlink_register(struct devlink *devlink, struct device *dev)
 {
 	int err;
@@ -324,6 +371,8 @@ int mlx5_devlink_register(struct devlink *devlink, struct device *dev)
 		goto unregister;
 	}
 
+	mlx5_devlink_set_params_init_values(devlink);
+
 	return 0;
 
 unregister:
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/crdump.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/crdump.c
index fe779e62fc70..94b74b256eaa 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/crdump.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/crdump.c
@@ -44,6 +44,7 @@ static const char *region_cr_space_str = "cr-space";
 
 struct mlx5_fw_crdump {
 	u32			size;
+	bool			snapshot_enable;
 	struct devlink_region	*region_crspace;
 };
 
@@ -125,6 +126,27 @@ int mlx5_crdump_collect(struct mlx5_core_dev *dev)
 	return ret;
 }
 
+bool mlx5_crdump_is_snapshot_enabled(struct mlx5_core_dev *dev)
+{
+	struct mlx5_priv *priv = &dev->priv;
+
+	if (mlx5_crdump_enbaled(dev))
+		return priv->health.crdump->snapshot_enable;
+
+	return false;
+}
+
+int mlx5_crdump_set_snapshot_enabled(struct mlx5_core_dev *dev, bool value)
+{
+	struct mlx5_priv *priv = &dev->priv;
+
+	if (!mlx5_crdump_enbaled(dev))
+		return -ENODEV;
+
+	priv->health.crdump->snapshot_enable = value;
+	return 0;
+}
+
 int mlx5_crdump_init(struct mlx5_core_dev *dev)
 {
 	struct devlink *devlink = priv_to_devlink(dev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
index fbdf332a9174..1533a959b82d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h
@@ -41,5 +41,7 @@ int  mlx5_core_reserved_gid_alloc(struct mlx5_core_dev *dev, int *gid_index);
 void mlx5_core_reserved_gid_free(struct mlx5_core_dev *dev, int gid_index);
 int mlx5_crdump_init(struct mlx5_core_dev *dev);
 void mlx5_crdump_cleanup(struct mlx5_core_dev *dev);
+bool mlx5_crdump_is_snapshot_enabled(struct mlx5_core_dev *dev);
+int mlx5_crdump_set_snapshot_enabled(struct mlx5_core_dev *dev, bool value);
 
 #endif
-- 
2.17.0