linux-hardening - [PATCH net-next v1 2/7] ice: ice_sched_remove

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Message-Id: <20230810103509.163225-3-przemyslaw.kitszel@intel.com>
Date:   Thu, 10 Aug 2023 06:35:04 -0400
From:   Przemek Kitszel <przemyslaw.kitszel@...el.com>
To:     Kees Cook <keescook@...omium.org>, netdev@...r.kernel.org
Cc:     Jacob Keller <jacob.e.keller@...el.com>,
        intel-wired-lan@...ts.osuosl.org,
        Alexander Lobakin <aleksander.lobakin@...el.com>,
        linux-hardening@...r.kernel.org, Steven Zou <steven.zou@...el.com>,
        Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: [PATCH net-next v1 2/7] ice: ice_sched_remove_elems: replace 1 elem array param by u32

Replace array+size params of ice_sched_remove_elems:() by just single u32,
as all callers are using it with "1".

This enables moving from heap-based, to stack-based allocation, what is also
more elegant thanks to DEFINE_FLEX() macro.

Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
---
add/remove: 2/2 grow/shrink: 0/2 up/down: 252/-388 (-136)
---
 drivers/net/ethernet/intel/ice/ice_sched.c | 26 ++++++++--------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_sched.c b/drivers/net/ethernet/intel/ice/ice_sched.c
index f4677704b95e..02b3a34b7698 100644
--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -229,37 +229,29 @@ ice_aq_delete_sched_elems(struct ice_hw *hw, u16 grps_req,
  * ice_sched_remove_elems - remove nodes from HW
  * @hw: pointer to the HW struct
  * @parent: pointer to the parent node
- * @num_nodes: number of nodes
- * @node_teids: array of node teids to be deleted
+ * @node_teid: node teid to be deleted
  *
  * This function remove nodes from HW
  */
 static int
 ice_sched_remove_elems(struct ice_hw *hw, struct ice_sched_node *parent,
-		       u16 num_nodes, u32 *node_teids)
+		       u32 node_teid)
 {
-	struct ice_aqc_delete_elem *buf;
-	u16 i, num_groups_removed = 0;
-	u16 buf_size;
+	DEFINE_FLEX(struct ice_aqc_delete_elem, buf, teid, 1);
+	u16 buf_size = const_flex_size(buf);
+	u16 num_groups_removed = 0;
 	int status;
 
-	buf_size = struct_size(buf, teid, num_nodes);
-	buf = devm_kzalloc(ice_hw_to_dev(hw), buf_size, GFP_KERNEL);
-	if (!buf)
-		return -ENOMEM;
-
 	buf->hdr.parent_teid = parent->info.node_teid;
-	buf->hdr.num_elems = cpu_to_le16(num_nodes);
-	for (i = 0; i < num_nodes; i++)
-		buf->teid[i] = cpu_to_le32(node_teids[i]);
+	buf->hdr.num_elems = cpu_to_le16(1);
+	buf->teid[0] = cpu_to_le32(node_teid);
 
 	status = ice_aq_delete_sched_elems(hw, 1, buf, buf_size,
 					   &num_groups_removed, NULL);
 	if (status || num_groups_removed != 1)
 		ice_debug(hw, ICE_DBG_SCHED, "remove node failed FW error %d\n",
 			  hw->adminq.sq_last_status);
 
-	devm_kfree(ice_hw_to_dev(hw), buf);
 	return status;
 }
 
@@ -326,7 +318,7 @@ void ice_free_sched_node(struct ice_port_info *pi, struct ice_sched_node *node)
 	    node->info.data.elem_type != ICE_AQC_ELEM_TYPE_LEAF) {
 		u32 teid = le32_to_cpu(node->info.node_teid);
 
-		ice_sched_remove_elems(hw, node->parent, 1, &teid);
+		ice_sched_remove_elems(hw, node->parent, teid);
 	}
 	parent = node->parent;
 	/* root has no parent */
@@ -1193,7 +1185,7 @@ static void ice_rm_dflt_leaf_node(struct ice_port_info *pi)
 		int status;
 
 		/* remove the default leaf node */
-		status = ice_sched_remove_elems(pi->hw, node->parent, 1, &teid);
+		status = ice_sched_remove_elems(pi->hw, node->parent, teid);
 		if (!status)
 			ice_free_sched_node(pi, node);
 	}
-- 
2.40.1