net: devlink: stub port params cmds for they are unused internally

Follow-up the removal of unused internal api of port params made by
commit 42ded61a ("devlink: Delete not used port parameters APIs")
and stub the commands and add extack message to tell the user what is
going on.

If later on port params are needed, could be easily re-introduced,
but until then it is a dead code.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20220826082730.1399735-1-jiri@resnulli.usSigned-off-by: Paolo Abeni <pabeni@redhat.com>

include/net/devlink.h

@@ -118,7 +118,6 @@ struct devlink_rate {
 
 struct devlink_port {
 	struct list_head list;
-	struct list_head param_list;
 	struct list_head region_list;
 	struct devlink *devlink;
 	unsigned int index;

net/core/devlink.c

@@ -5635,89 +5635,22 @@ static int devlink_nl_cmd_param_set_doit(struct sk_buff *skb,
 static int devlink_nl_cmd_port_param_get_dumpit(struct sk_buff *msg,
 						struct netlink_callback *cb)
 {
-	struct devlink_param_item *param_item;
-	struct devlink_port *devlink_port;
-	struct devlink *devlink;
-	int start = cb->args[0];
-	unsigned long index;
-	int idx = 0;
-	int err = 0;
-
-	devlinks_xa_for_each_registered_get(sock_net(msg->sk), index, devlink) {
-		devl_lock(devlink);
-		list_for_each_entry(devlink_port, &devlink->port_list, list) {
-			list_for_each_entry(param_item,
-					    &devlink_port->param_list, list) {
-				if (idx < start) {
-					idx++;
-					continue;
-				}
-				err = devlink_nl_param_fill(msg,
-						devlink_port->devlink,
-						devlink_port->index, param_item,
-						DEVLINK_CMD_PORT_PARAM_GET,
-						NETLINK_CB(cb->skb).portid,
-						cb->nlh->nlmsg_seq,
-						NLM_F_MULTI);
-				if (err == -EOPNOTSUPP) {
-					err = 0;
-				} else if (err) {
-					devl_unlock(devlink);
-					devlink_put(devlink);
-					goto out;
-				}
-				idx++;
-			}
-		}
-		devl_unlock(devlink);
-		devlink_put(devlink);
-	}
-out:
-	if (err != -EMSGSIZE)
-		return err;
-
-	cb->args[0] = idx;
+	NL_SET_ERR_MSG_MOD(cb->extack, "Port params are not supported");
 	return msg->len;
 }
 
 static int devlink_nl_cmd_port_param_get_doit(struct sk_buff *skb,
 					      struct genl_info *info)
 {
-	struct devlink_port *devlink_port = info->user_ptr[1];
-	struct devlink_param_item *param_item;
-	struct sk_buff *msg;
-	int err;
-
-	param_item = devlink_param_get_from_info(&devlink_port->param_list,
-						 info);
-	if (!param_item)
-		return -EINVAL;
-
-	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
-	if (!msg)
-		return -ENOMEM;
-
-	err = devlink_nl_param_fill(msg, devlink_port->devlink,
-				    devlink_port->index, param_item,
-				    DEVLINK_CMD_PORT_PARAM_GET,
-				    info->snd_portid, info->snd_seq, 0);
-	if (err) {
-		nlmsg_free(msg);
-		return err;
-	}
-
-	return genlmsg_reply(msg, info);
+	NL_SET_ERR_MSG_MOD(info->extack, "Port params are not supported");
+	return -EINVAL;
 }
 
 static int devlink_nl_cmd_port_param_set_doit(struct sk_buff *skb,
 					      struct genl_info *info)
 {
-	struct devlink_port *devlink_port = info->user_ptr[1];
-
-	return __devlink_nl_cmd_param_set_doit(devlink_port->devlink,
-					       devlink_port->index,
-					       &devlink_port->param_list, info,
-					       DEVLINK_CMD_PORT_PARAM_NEW);
+	NL_SET_ERR_MSG_MOD(info->extack, "Port params are not supported");
+	return -EINVAL;
 }
 
 static int devlink_nl_region_snapshot_id_put(struct sk_buff *msg,
@@ -9943,7 +9876,6 @@ int devl_port_register(struct devlink *devlink,
 	INIT_LIST_HEAD(&devlink_port->reporter_list);
 	mutex_init(&devlink_port->reporters_lock);
 	list_add_tail(&devlink_port->list, &devlink->port_list);
-	INIT_LIST_HEAD(&devlink_port->param_list);
 	INIT_LIST_HEAD(&devlink_port->region_list);
 
 	INIT_DELAYED_WORK(&devlink_port->type_warn_dw, &devlink_port_type_warn);