diff mbox series

[net-next,v12,04/11] devlink: Allow for devlink-rate nodes parent reassignment

Message ID 20221115104825.172668-5-michal.wilczynski@intel.com (mailing list archive)
State Accepted
Commit 04d674f04e32d4109f0ee505a8855a384481212d
Delegated to: Netdev Maintainers
Headers show
Series Implement devlink-rate API and extend it | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers warning 3 maintainers not CCed: davem@davemloft.net pabeni@redhat.com edumazet@google.com
netdev/build_clang success Errors and warnings before: 5 this patch: 5
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 30 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Wilczynski, Michal Nov. 15, 2022, 10:48 a.m. UTC 
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>
---
 net/core/devlink.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 3dfee7cd9929..61d431578f5f 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -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;
 	}