devlink: parse rate attrs in doit() callbacks

No need to give the rate any special treatment in netlink attributes
parsing, as unlike for ports, there is only a couple of commands
benefiting from that.

Remove DEVLINK_NL_FLAG_NEED_RATE*, make pre_doit() callback simpler
by moving the rate attributes parsing to rate_*_doit() ops.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230811155714.1736405-3-jiri@resnulli.usSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/devlink/devl_internal.h

@@ -92,8 +92,6 @@ static inline bool devl_is_registered(struct devlink *devlink)
 /* Netlink */
 #define DEVLINK_NL_FLAG_NEED_PORT		BIT(0)
 #define DEVLINK_NL_FLAG_NEED_DEVLINK_OR_PORT	BIT(1)
-#define DEVLINK_NL_FLAG_NEED_RATE		BIT(2)
-#define DEVLINK_NL_FLAG_NEED_RATE_NODE		BIT(3)
 
 enum devlink_multicast_groups {
 	DEVLINK_MCGRP_CONFIG,
@@ -205,11 +203,7 @@ int devlink_resources_validate(struct devlink *devlink,
 /* Rates */
 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
 			     struct netlink_ext_ack *extack);
-struct devlink_rate *
-devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info);
-struct devlink_rate *
-devlink_rate_node_get_from_info(struct devlink *devlink,
-				struct genl_info *info);
+
 /* Devlink nl cmds */
 int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info);
 int devlink_nl_cmd_eswitch_get_doit(struct sk_buff *skb, struct genl_info *info);

net/devlink/leftover.c

@@ -232,13 +232,13 @@ devlink_rate_node_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
 	return devlink_rate_node_get_by_name(devlink, rate_node_name);
 }
 
-struct devlink_rate *
+static struct devlink_rate *
 devlink_rate_node_get_from_info(struct devlink *devlink, struct genl_info *info)
 {
 	return devlink_rate_node_get_from_attrs(devlink, info->attrs);
 }
 
-struct devlink_rate *
+static struct devlink_rate *
 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info)
 {
 	struct nlattr **attrs = info->attrs;
@@ -1041,10 +1041,15 @@ const struct devlink_cmd devl_cmd_rate_get = {
 static int devlink_nl_cmd_rate_get_doit(struct sk_buff *skb,
 					struct genl_info *info)
 {
-	struct devlink_rate *devlink_rate = info->user_ptr[1];
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_rate *devlink_rate;
 	struct sk_buff *msg;
 	int err;
 
+	devlink_rate = devlink_rate_get_from_info(devlink, info);
+	if (IS_ERR(devlink_rate))
+		return PTR_ERR(devlink_rate);
+
 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
@@ -1629,11 +1634,16 @@ static bool devlink_rate_set_ops_supported(const struct devlink_ops *ops,
 static int devlink_nl_cmd_rate_set_doit(struct sk_buff *skb,
 					struct genl_info *info)
 {
-	struct devlink_rate *devlink_rate = info->user_ptr[1];
-	struct devlink *devlink = devlink_rate->devlink;
-	const struct devlink_ops *ops = devlink->ops;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_rate *devlink_rate;
+	const struct devlink_ops *ops;
 	int err;
 
+	devlink_rate = devlink_rate_get_from_info(devlink, info);
+	if (IS_ERR(devlink_rate))
+		return PTR_ERR(devlink_rate);
+
+	ops = devlink->ops;
 	if (!ops || !devlink_rate_set_ops_supported(ops, info, devlink_rate->type))
 		return -EOPNOTSUPP;
 
@@ -1704,18 +1714,22 @@ static int devlink_nl_cmd_rate_new_doit(struct sk_buff *skb,
 static int devlink_nl_cmd_rate_del_doit(struct sk_buff *skb,
 					struct genl_info *info)
 {
-	struct devlink_rate *rate_node = info->user_ptr[1];
-	struct devlink *devlink = rate_node->devlink;
-	const struct devlink_ops *ops = devlink->ops;
+	struct devlink *devlink = info->user_ptr[0];
+	struct devlink_rate *rate_node;
 	int err;
 
+	rate_node = devlink_rate_node_get_from_info(devlink, info);
+	if (IS_ERR(rate_node))
+		return PTR_ERR(rate_node);
+
 	if (refcount_read(&rate_node->refcnt) > 1) {
 		NL_SET_ERR_MSG(info->extack, "Node has children. Cannot delete node.");
 		return -EBUSY;
 	}
 
 	devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_DEL);
-	err = ops->rate_node_del(rate_node, rate_node->priv, info->extack);
+	err = devlink->ops->rate_node_del(rate_node, rate_node->priv,
+					  info->extack);
 	if (rate_node->parent)
 		refcount_dec(&rate_node->parent->refcnt);
 	list_del(&rate_node->list);
@@ -6307,14 +6321,12 @@ const struct genl_small_ops devlink_nl_small_ops[54] = {
 		.cmd = DEVLINK_CMD_RATE_GET,
 		.doit = devlink_nl_cmd_rate_get_doit,
 		.dumpit = devlink_nl_instance_iter_dumpit,
-		.internal_flags = DEVLINK_NL_FLAG_NEED_RATE,
 		/* can be retrieved by unprivileged users */
 	},
 	{
 		.cmd = DEVLINK_CMD_RATE_SET,
 		.doit = devlink_nl_cmd_rate_set_doit,
 		.flags = GENL_ADMIN_PERM,
-		.internal_flags = DEVLINK_NL_FLAG_NEED_RATE,
 	},
 	{
 		.cmd = DEVLINK_CMD_RATE_NEW,
@@ -6325,7 +6337,6 @@ const struct genl_small_ops devlink_nl_small_ops[54] = {
 		.cmd = DEVLINK_CMD_RATE_DEL,
 		.doit = devlink_nl_cmd_rate_del_doit,
 		.flags = GENL_ADMIN_PERM,
-		.internal_flags = DEVLINK_NL_FLAG_NEED_RATE_NODE,
 	},
 	{
 		.cmd = DEVLINK_CMD_PORT_SPLIT,

net/devlink/netlink.c

@@ -132,24 +132,6 @@ int devlink_nl_pre_doit(const struct genl_split_ops *ops,
 		devlink_port = devlink_port_get_from_info(devlink, info);
 		if (!IS_ERR(devlink_port))
 			info->user_ptr[1] = devlink_port;
-	} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_RATE) {
-		struct devlink_rate *devlink_rate;
-
-		devlink_rate = devlink_rate_get_from_info(devlink, info);
-		if (IS_ERR(devlink_rate)) {
-			err = PTR_ERR(devlink_rate);
-			goto unlock;
-		}
-		info->user_ptr[1] = devlink_rate;
-	} else if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_RATE_NODE) {
-		struct devlink_rate *rate_node;
-
-		rate_node = devlink_rate_node_get_from_info(devlink, info);
-		if (IS_ERR(rate_node)) {
-			err = PTR_ERR(rate_node);
-			goto unlock;
-		}
-		info->user_ptr[1] = rate_node;
 	}
 	return 0;