[net-next PATCH V3 04/12] octeontx2-af: devlink configuration support

@@ -10,6 +10,7 @@
 #include "rvu.h"
 #include "rvu_reg.h"
 #include "rvu_struct.h"
+#include "rvu_npc_hash.h"
 
 #define DRV_NAME "octeontx2-af"
 

@@ -1436,14 +1437,75 @@ static int rvu_af_dl_dwrr_mtu_get(struct devlink *devlink, u32 id,
 enum rvu_af_dl_param_id {
 	RVU_AF_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
 	RVU_AF_DEVLINK_PARAM_ID_DWRR_MTU,
+	RVU_AF_DEVLINK_PARAM_ID_NPC_EXACT_FEATURE_DISABLE,
 };
 
+static int rvu_af_npc_exact_feature_get(struct devlink *devlink, u32 id,
+					struct devlink_param_gset_ctx *ctx)
+{
+	struct rvu_devlink *rvu_dl = devlink_priv(devlink);
+	struct rvu *rvu = rvu_dl->rvu;
+	bool enabled;
+
+	enabled = rvu_npc_exact_has_match_table(rvu);
+
+	snprintf(ctx->val.vstr, sizeof(ctx->val.vstr), "%s",
+		 enabled ? "enabled" : "disabled");
+
+	return 0;
+}
+
+static int rvu_af_npc_exact_feature_disable(struct devlink *devlink, u32 id,
+					    struct devlink_param_gset_ctx *ctx)
+{
+	struct rvu_devlink *rvu_dl = devlink_priv(devlink);
+	struct rvu *rvu = rvu_dl->rvu;
+
+	rvu_npc_exact_disable_feature(rvu);
+
+	return 0;
+}
+
+static int rvu_af_npc_exact_feature_validate(struct devlink *devlink, u32 id,
+					     union devlink_param_value val,
+					     struct netlink_ext_ack *extack)
+{
+	struct rvu_devlink *rvu_dl = devlink_priv(devlink);
+	struct rvu *rvu = rvu_dl->rvu;
+	u64 enable;
+
+	if (kstrtoull(val.vstr, 10, &enable)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Only 1 value is supported");
+		return -EINVAL;
+	}
+
+	if (enable != 1) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "Only disabling exact match feature is supported");
+		return -EINVAL;
+	}
+
+	if (rvu_npc_exact_can_disable_feature(rvu))
+		return 0;
+
+	NL_SET_ERR_MSG_MOD(extack,
+			   "Can't disable exact match feature; Please try before any configuration");
+	return -EFAULT;
+}
+
 static const struct devlink_param rvu_af_dl_params[] = {
 	DEVLINK_PARAM_DRIVER(RVU_AF_DEVLINK_PARAM_ID_DWRR_MTU,
 			     "dwrr_mtu", DEVLINK_PARAM_TYPE_U32,
 			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
 			     rvu_af_dl_dwrr_mtu_get, rvu_af_dl_dwrr_mtu_set,
 			     rvu_af_dl_dwrr_mtu_validate),
+	DEVLINK_PARAM_DRIVER(RVU_AF_DEVLINK_PARAM_ID_NPC_EXACT_FEATURE_DISABLE,
+			     "npc_exact_feature_disable", DEVLINK_PARAM_TYPE_STRING,
+			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+			     rvu_af_npc_exact_feature_get,
+			     rvu_af_npc_exact_feature_disable,
+			     rvu_af_npc_exact_feature_validate),
 };
 
 /* Devlink switch mode */

@@ -1501,6 +1563,7 @@ int rvu_register_dl(struct rvu *rvu)
 {
 	struct rvu_devlink *rvu_dl;
 	struct devlink *dl;
+	size_t size;
 	int err;
 
 	dl = devlink_alloc(&rvu_devlink_ops, sizeof(struct rvu_devlink),

@@ -1522,8 +1585,12 @@ int rvu_register_dl(struct rvu *rvu)
 		goto err_dl_health;
 	}
 
-	err = devlink_params_register(dl, rvu_af_dl_params,
-				      ARRAY_SIZE(rvu_af_dl_params));
+	/* Register exact match devlink only for CN10K-B */
+	size = ARRAY_SIZE(rvu_af_dl_params);
+	if (!rvu_npc_exact_has_match_table(rvu))
+		size -= 1;
+
+	err = devlink_params_register(dl, rvu_af_dl_params, size);
 	if (err) {
 		dev_err(rvu->dev,
 			"devlink params register failed with error %d", err);

@@ -1154,6 +1154,35 @@ static int __maybe_unused rvu_npc_exact_update_table_entry(struct rvu *rvu, u8 c
 	return 0;
 }
 
+/**
+ *	rvu_npc_exact_can_disable_feature - Check if feature can be disabled.
+ *      @rvu: resource virtualization unit.
+ *	Return: True if exact match feature is supported.
+ */
+bool rvu_npc_exact_can_disable_feature(struct rvu *rvu)
+{
+	struct npc_exact_table *table = rvu->hw->table;
+	bool empty;
+
+	if (!rvu->hw->cap.npc_exact_match_enabled)
+		return false;
+
+	mutex_lock(&table->lock);
+	empty = list_empty(&table->lhead_gbl);
+	mutex_unlock(&table->lock);
+
+	return empty;
+}
+
+/**
+ *	rvu_npc_exact_disable_feature - Disable feature.
+ *      @rvu: resource virtualization unit.
+ */
+void rvu_npc_exact_disable_feature(struct rvu *rvu)
+{
+	rvu->hw->cap.npc_exact_match_enabled = false;
+}
+
 /**
  *      rvu_npc_exact_init - initialize exact match table
  *      @rvu: resource virtualization unit.

@@ -185,4 +185,7 @@ int rvu_npc_exact_del_table_entry_by_id(struct rvu *rvu, u32 seq_id);
 u32 rvu_npc_exact_get_max_entries(struct rvu *rvu);
 int rvu_npc_exact_init(struct rvu *rvu);
 
+bool rvu_npc_exact_can_disable_feature(struct rvu *rvu);
+void rvu_npc_exact_disable_feature(struct rvu *rvu);
+
 #endif /* RVU_NPC_HASH_H */