net/mlx5: Reset bw_share field when changing a node's parent

JIRA: https://issues.redhat.com/browse/RHEL-72227
JIRA: https://issues.redhat.com/browse/RHEL-73520
Upstream-status: v6.16-rc6

commit f7b7646
Author: Carolina Jubran <cjubran@nvidia.com>
Date:   Thu Jul 10 16:53:42 2025 +0300

    net/mlx5: Reset bw_share field when changing a node's parent

    When changing a node's parent, its scheduling element is destroyed and
    re-created with bw_share 0. However, the node's bw_share field was not
    updated accordingly.

    Set the node's bw_share to 0 after re-creation to keep the software
    state in sync with the firmware configuration.

    Fixes: 9c7bbf4 ("net/mlx5: Add support for setting parent of nodes")
    Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
    Reviewed-by: Cosmin Ratiu <cratiu@nvidia.com>
    Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
    Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
    Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
    Link: https://patch.msgid.link/1752155624-24095-2-git-send-email-tariqt@nvidia.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Benjamin Poirier <bpoirier@redhat.com>

Author: Benjamin Poirier

drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c

@@ -1076,6 +1076,7 @@ static int esw_qos_vports_node_update_parent(struct mlx5_esw_sched_node *node,
 		return err;
 	}
 	esw_qos_node_set_parent(node, parent);
+	node->bw_share = 0;
 
 	return 0;
 }