diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index 8a766fe..f9c7247 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -770,27 +770,35 @@ static void mlxsw_core_driver_put(const char *kind)
 
 static int mlxsw_devlink_port_split(struct devlink *devlink,
 				    unsigned int port_index,
-				    unsigned int count)
+				    unsigned int count,
+				    struct netlink_ext_ack *extack)
 {
 	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 
-	if (port_index >= mlxsw_core->max_ports)
+	if (port_index >= mlxsw_core->max_ports) {
+		NL_SET_ERR_MSG_MOD(extack, "Port index exceeds maximum number of ports");
 		return -EINVAL;
+	}
 	if (!mlxsw_core->driver->port_split)
 		return -EOPNOTSUPP;
-	return mlxsw_core->driver->port_split(mlxsw_core, port_index, count);
+	return mlxsw_core->driver->port_split(mlxsw_core, port_index, count,
+					      extack);
 }
 
 static int mlxsw_devlink_port_unsplit(struct devlink *devlink,
-				      unsigned int port_index)
+				      unsigned int port_index,
+				      struct netlink_ext_ack *extack)
 {
 	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 
-	if (port_index >= mlxsw_core->max_ports)
+	if (port_index >= mlxsw_core->max_ports) {
+		NL_SET_ERR_MSG_MOD(extack, "Port index exceeds maximum number of ports");
 		return -EINVAL;
+	}
 	if (!mlxsw_core->driver->port_unsplit)
 		return -EOPNOTSUPP;
-	return mlxsw_core->driver->port_unsplit(mlxsw_core, port_index);
+	return mlxsw_core->driver->port_unsplit(mlxsw_core, port_index,
+						extack);
 }
 
 static int
@@ -963,7 +971,8 @@ mlxsw_devlink_sb_occ_tc_port_bind_get(struct devlink_port *devlink_port,
 						     pool_type, p_cur, p_max);
 }
 
-static int mlxsw_devlink_core_bus_device_reload(struct devlink *devlink)
+static int mlxsw_devlink_core_bus_device_reload(struct devlink *devlink,
+						struct netlink_ext_ack *extack)
 {
 	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
 	int err;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.h b/drivers/net/ethernet/mellanox/mlxsw/core.h
index 4a8d4c7..552cfa2 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.h
@@ -274,8 +274,9 @@ struct mlxsw_driver {
 	int (*port_type_set)(struct mlxsw_core *mlxsw_core, u8 local_port,
 			     enum devlink_port_type new_type);
 	int (*port_split)(struct mlxsw_core *mlxsw_core, u8 local_port,
-			  unsigned int count);
-	int (*port_unsplit)(struct mlxsw_core *mlxsw_core, u8 local_port);
+			  unsigned int count, struct netlink_ext_ack *extack);
+	int (*port_unsplit)(struct mlxsw_core *mlxsw_core, u8 local_port,
+			    struct netlink_ext_ack *extack);
 	int (*sb_pool_get)(struct mlxsw_core *mlxsw_core,
 			   unsigned int sb_index, u16 pool_index,
 			   struct devlink_sb_pool_info *pool_info);
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index fc39f22..968b88a 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -3092,7 +3092,8 @@ static void mlxsw_sp_port_unsplit_create(struct mlxsw_sp *mlxsw_sp,
 }
 
 static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
-			       unsigned int count)
+			       unsigned int count,
+			       struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
 	struct mlxsw_sp_port *mlxsw_sp_port;
@@ -3104,6 +3105,7 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 	if (!mlxsw_sp_port) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port number \"%d\" does not exist\n",
 			local_port);
+		NL_SET_ERR_MSG_MOD(extack, "Port number does not exist");
 		return -EINVAL;
 	}
 
@@ -3112,11 +3114,13 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 
 	if (count != 2 && count != 4) {
 		netdev_err(mlxsw_sp_port->dev, "Port can only be split into 2 or 4 ports\n");
+		NL_SET_ERR_MSG_MOD(extack, "Port can only be split into 2 or 4 ports");
 		return -EINVAL;
 	}
 
 	if (cur_width != MLXSW_PORT_MODULE_MAX_WIDTH) {
 		netdev_err(mlxsw_sp_port->dev, "Port cannot be split further\n");
+		NL_SET_ERR_MSG_MOD(extack, "Port cannot be split further");
 		return -EINVAL;
 	}
 
@@ -3125,6 +3129,7 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 		base_port = local_port;
 		if (mlxsw_sp->ports[base_port + 1]) {
 			netdev_err(mlxsw_sp_port->dev, "Invalid split configuration\n");
+			NL_SET_ERR_MSG_MOD(extack, "Invalid split configuration");
 			return -EINVAL;
 		}
 	} else {
@@ -3132,6 +3137,7 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 		if (mlxsw_sp->ports[base_port + 1] ||
 		    mlxsw_sp->ports[base_port + 3]) {
 			netdev_err(mlxsw_sp_port->dev, "Invalid split configuration\n");
+			NL_SET_ERR_MSG_MOD(extack, "Invalid split configuration");
 			return -EINVAL;
 		}
 	}
@@ -3153,7 +3159,8 @@ static int mlxsw_sp_port_split(struct mlxsw_core *mlxsw_core, u8 local_port,
 	return err;
 }
 
-static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port)
+static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port,
+				 struct netlink_ext_ack *extack)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
 	struct mlxsw_sp_port *mlxsw_sp_port;
@@ -3165,11 +3172,13 @@ static int mlxsw_sp_port_unsplit(struct mlxsw_core *mlxsw_core, u8 local_port)
 	if (!mlxsw_sp_port) {
 		dev_err(mlxsw_sp->bus_info->dev, "Port number \"%d\" does not exist\n",
 			local_port);
+		NL_SET_ERR_MSG_MOD(extack, "Port number does not exist");
 		return -EINVAL;
 	}
 
 	if (!mlxsw_sp_port->split) {
-		netdev_err(mlxsw_sp_port->dev, "Port wasn't split\n");
+		netdev_err(mlxsw_sp_port->dev, "Port was not split\n");
+		NL_SET_ERR_MSG_MOD(extack, "Port was not split");
 		return -EINVAL;
 	}
 
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
index 71c2edd..db463e2 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
@@ -92,7 +92,7 @@ nfp_devlink_set_lanes(struct nfp_pf *pf, unsigned int idx, unsigned int lanes)
 
 static int
 nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
-		       unsigned int count)
+		       unsigned int count, struct netlink_ext_ack *extack)
 {
 	struct nfp_pf *pf = devlink_priv(devlink);
 	struct nfp_eth_table_port eth_port;
@@ -123,7 +123,8 @@ nfp_devlink_port_split(struct devlink *devlink, unsigned int port_index,
 }
 
 static int
-nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index)
+nfp_devlink_port_unsplit(struct devlink *devlink, unsigned int port_index,
+			 struct netlink_ext_ack *extack)
 {
 	struct nfp_pf *pf = devlink_priv(devlink);
 	struct nfp_eth_table_port eth_port;
diff --git a/drivers/net/netdevsim/devlink.c b/drivers/net/netdevsim/devlink.c
index bef7db5..ba663e5 100644
--- a/drivers/net/netdevsim/devlink.c
+++ b/drivers/net/netdevsim/devlink.c
@@ -147,7 +147,8 @@ static int devlink_resources_register(struct devlink *devlink)
 	return err;
 }
 
-static int nsim_devlink_reload(struct devlink *devlink)
+static int nsim_devlink_reload(struct devlink *devlink,
+			       struct netlink_ext_ack *extack)
 {
 	enum nsim_resource_id res_ids[] = {
 		NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
@@ -162,7 +163,7 @@ static int nsim_devlink_reload(struct devlink *devlink)
 
 		err = devlink_resource_size_get(devlink, res_ids[i], &val);
 		if (!err) {
-			err = nsim_fib_set_max(net, res_ids[i], val);
+			err = nsim_fib_set_max(net, res_ids[i], val, extack);
 			if (err)
 				return err;
 		}
@@ -180,7 +181,7 @@ static void nsim_devlink_net_reset(struct net *net)
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
-		if (nsim_fib_set_max(net, res_ids[i], (u64)-1)) {
+		if (nsim_fib_set_max(net, res_ids[i], (u64)-1, NULL)) {
 			pr_err("Failed to reset limit for resource %u\n",
 			       res_ids[i]);
 		}
diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
index 9bfe9e1..f61d094 100644
--- a/drivers/net/netdevsim/fib.c
+++ b/drivers/net/netdevsim/fib.c
@@ -64,7 +64,8 @@ u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max)
 	return max ? entry->max : entry->num;
 }
 
-int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val)
+int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val,
+		     struct netlink_ext_ack *extack)
 {
 	struct nsim_fib_data *fib_data = net_generic(net, nsim_fib_net_id);
 	struct nsim_fib_entry *entry;
@@ -90,10 +91,12 @@ int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val)
 	/* not allowing a new max to be less than curren occupancy
 	 * --> no means of evicting entries
 	 */
-	if (val < entry->num)
+	if (val < entry->num) {
+		NL_SET_ERR_MSG_MOD(extack, "New size is less than current occupancy");
 		err = -EINVAL;
-	else
+	} else {
 		entry->max = val;
+	}
 
 	return err;
 }
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index 3a8581a..8ca50b7 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -126,7 +126,8 @@ void nsim_devlink_exit(void);
 int nsim_fib_init(void);
 void nsim_fib_exit(void);
 u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max);
-int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val);
+int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val,
+		     struct netlink_ext_ack *extack);
 #else
 static inline int nsim_devlink_setup(struct netdevsim *ns)
 {
diff --git a/include/net/devlink.h b/include/net/devlink.h
index 9686a1a..e336ea9 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -296,12 +296,13 @@ struct devlink_resource {
 #define DEVLINK_RESOURCE_ID_PARENT_TOP 0
 
 struct devlink_ops {
-	int (*reload)(struct devlink *devlink);
+	int (*reload)(struct devlink *devlink, struct netlink_ext_ack *extack);
 	int (*port_type_set)(struct devlink_port *devlink_port,
 			     enum devlink_port_type port_type);
 	int (*port_split)(struct devlink *devlink, unsigned int port_index,
-			  unsigned int count);
-	int (*port_unsplit)(struct devlink *devlink, unsigned int port_index);
+			  unsigned int count, struct netlink_ext_ack *extack);
+	int (*port_unsplit)(struct devlink *devlink, unsigned int port_index,
+			    struct netlink_ext_ack *extack);
 	int (*sb_pool_get)(struct devlink *devlink, unsigned int sb_index,
 			   u16 pool_index,
 			   struct devlink_sb_pool_info *pool_info);
diff --git a/net/core/devlink.c b/net/core/devlink.c
index f75ee02..2209970 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -702,12 +702,13 @@ static int devlink_nl_cmd_port_set_doit(struct sk_buff *skb,
 	return 0;
 }
 
-static int devlink_port_split(struct devlink *devlink,
-			      u32 port_index, u32 count)
+static int devlink_port_split(struct devlink *devlink, u32 port_index,
+			      u32 count, struct netlink_ext_ack *extack)
 
 {
 	if (devlink->ops && devlink->ops->port_split)
-		return devlink->ops->port_split(devlink, port_index, count);
+		return devlink->ops->port_split(devlink, port_index, count,
+						extack);
 	return -EOPNOTSUPP;
 }
 
@@ -724,14 +725,15 @@ static int devlink_nl_cmd_port_split_doit(struct sk_buff *skb,
 
 	port_index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
 	count = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_SPLIT_COUNT]);
-	return devlink_port_split(devlink, port_index, count);
+	return devlink_port_split(devlink, port_index, count, info->extack);
 }
 
-static int devlink_port_unsplit(struct devlink *devlink, u32 port_index)
+static int devlink_port_unsplit(struct devlink *devlink, u32 port_index,
+				struct netlink_ext_ack *extack)
 
 {
 	if (devlink->ops && devlink->ops->port_unsplit)
-		return devlink->ops->port_unsplit(devlink, port_index);
+		return devlink->ops->port_unsplit(devlink, port_index, extack);
 	return -EOPNOTSUPP;
 }
 
@@ -745,7 +747,7 @@ static int devlink_nl_cmd_port_unsplit_doit(struct sk_buff *skb,
 		return -EINVAL;
 
 	port_index = nla_get_u32(info->attrs[DEVLINK_ATTR_PORT_INDEX]);
-	return devlink_port_unsplit(devlink, port_index);
+	return devlink_port_unsplit(devlink, port_index, info->extack);
 }
 
 static int devlink_nl_sb_fill(struct sk_buff *msg, struct devlink *devlink,
@@ -2599,7 +2601,7 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
 		NL_SET_ERR_MSG_MOD(info->extack, "resources size validation failed");
 		return err;
 	}
-	return devlink->ops->reload(devlink);
+	return devlink->ops->reload(devlink, info->extack);
 }
 
 static const struct nla_policy devlink_nl_policy[DEVLINK_ATTR_MAX + 1] = {