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devlink: Allow for devlink-rate nodes parent reassignment 

Currently it's not possible to reassign the parent of the node using one
command. As the previous commit introduced a way to export entire
hierarchy from the driver, being able to modify and reassign parents
become important. This way user might easily change QoS settings without
interrupting traffic.

Example command:
devlink port function rate set pci/0000:4b:00.0/1 parent node_custom_1

This reassigns leaf node parent to node_custom_1.

Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michal Wilczynski 2022-11-15 11:48:18 +01:00 committed by Jakub Kicinski
parent caba177d7f
commit 04d674f04e
1 changed files with 7 additions and 5 deletions
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12
net/core/devlink.c
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@ -1887,10 +1887,8 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *devlink_rate,
int err = -EOPNOTSUPP;
parent = devlink_rate->parent;
if (parent && len) {
NL_SET_ERR_MSG_MOD(info->extack, "Rate object already has parent.");
return -EBUSY;
} else if (parent && !len) {
if (parent && !len) {
if (devlink_rate_is_leaf(devlink_rate))
err = ops->rate_leaf_parent_set(devlink_rate, NULL,
devlink_rate->priv, NULL,
@ -1904,7 +1902,7 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *devlink_rate,
refcount_dec(&parent->refcnt);
devlink_rate->parent = NULL;
} else if (!parent && len) {
} else if (len) {
parent = devlink_rate_node_get_by_name(devlink, parent_name);
if (IS_ERR(parent))
return -ENODEV;
@ -1931,6 +1929,10 @@ devlink_nl_rate_parent_node_set(struct devlink_rate *devlink_rate,
if (err)
return err;
if (devlink_rate->parent)
/* we're reassigning to other parent in this case */
refcount_dec(&devlink_rate->parent->refcnt);
refcount_inc(&parent->refcnt);
devlink_rate->parent = parent;
}