ice: check for a leaf node presence

Check for a leaf node presence for a given VSI. This check is required
before removing a VSI since VSIs can't be removed with enabled queues
(with leaf nodes) from the FW scheduler tree unless its a reset.

Signed-off-by: Victor Raj <victor.raj@intel.com>
Reviewed-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c b/drivers/net/ethernet/intel/ice/ice_sched.c
index f355f59d8b64..56049739a250 100644
--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -1616,6 +1616,23 @@ ice_sched_rm_agg_vsi_info(struct ice_port_info *pi, u16 vsi_handle)
 }
 
 /**
+ * ice_sched_is_leaf_node_present - check for a leaf node in the sub-tree
+ * @node: pointer to the sub-tree node
+ *
+ * This function checks for a leaf node presence in a given sub-tree node.
+ */
+static bool ice_sched_is_leaf_node_present(struct ice_sched_node *node)
+{
+        u8 i;
+
+        for (i = 0; i < node->num_children; i++)
+                if (ice_sched_is_leaf_node_present(node->children[i]))
+                        return true;
+        /* check for a leaf node */
+        return (node->info.data.elem_type == ICE_AQC_ELEM_TYPE_LEAF);
+}
+
+/**
  * ice_sched_rm_vsi_cfg - remove the VSI and its children nodes
  * @pi: port information structure
  * @vsi_handle: software VSI handle
@@ -1649,6 +1666,12 @@ ice_sched_rm_vsi_cfg(struct ice_port_info *pi, u16 vsi_handle, u8 owner)
                 if (!vsi_node)
                         continue;
 
+                if (ice_sched_is_leaf_node_present(vsi_node)) {
+                        ice_debug(pi->hw, ICE_DBG_SCHED,
+                                  "VSI has leaf nodes in TC %d\n", i);
+                        status = ICE_ERR_IN_USE;
+                        goto exit_sched_rm_vsi_cfg;
+                }
                 while (j < vsi_node->num_children) {
                         if (vsi_node->children[j]->owner == owner) {
                                 ice_free_sched_node(pi, vsi_node->children[j]);