From: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Date: Thu, 9 Aug 2018 06:29:45 -0700
Subject: ice: Updates to Tx scheduler code
Patch-mainline: v4.20-rc1
Git-commit: b36c598c999c628130f6743dc2362585360de65c
References: bsc#1118661 FATE#325277

1) The maximum device nodes is a global value and shared by the whole
   device. Add element AQ command would fail if there is no space to
   add new nodes so the check for max nodes isn't required. So remove
   ice_sched_get_num_nodes_per_layer and ice_sched_val_max_nodes.

2) In ice_sched_add_elems, set default node's CIR/EIR bandwidth weight.

3) Fix default scheduler topology buffer size as the firmware expects
   a 4KB buffer at all times, and will error out if one of any other
   size is provided.

4) In the latest spec, max children per node per layer is replaced by
   max sibling group size. Now it provides the max children of the below
   layer node, not the current layer node.

5) Fix some newline/whitespace issues for consistency.

Signed-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/ice/ice_adminq_cmd.h |    5 
 drivers/net/ethernet/intel/ice/ice_common.c     |    7 +
 drivers/net/ethernet/intel/ice/ice_sched.c      |  161 +++++++-----------------
 drivers/net/ethernet/intel/ice/ice_type.h       |    2 
 4 files changed, 61 insertions(+), 114 deletions(-)

--- a/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
+++ b/drivers/net/ethernet/intel/ice/ice_adminq_cmd.h
@@ -771,9 +771,8 @@ struct ice_aqc_layer_props {
 	u8 chunk_size;
 	__le16 max_device_nodes;
 	__le16 max_pf_nodes;
-	u8 rsvd0[2];
-	__le16 max_shared_rate_lmtr;
-	__le16 max_children;
+	u8 rsvd0[4];
+	__le16 max_sibl_grp_sz;
 	__le16 max_cir_rl_profiles;
 	__le16 max_eir_rl_profiles;
 	__le16 max_srl_profiles;
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -527,6 +527,13 @@ enum ice_status ice_init_hw(struct ice_h
 	if (status)
 		goto err_unroll_sched;
 
+	/* need a valid SW entry point to build a Tx tree */
+	if (!hw->sw_entry_point_layer) {
+		ice_debug(hw, ICE_DBG_SCHED, "invalid sw entry point\n");
+		status = ICE_ERR_CFG;
+		goto err_unroll_sched;
+	}
+
 	status = ice_init_fltr_mgmt_struct(hw);
 	if (status)
 		goto err_unroll_sched;
--- a/drivers/net/ethernet/intel/ice/ice_sched.c
+++ b/drivers/net/ethernet/intel/ice/ice_sched.c
@@ -17,7 +17,6 @@ ice_sched_add_root_node(struct ice_port_
 {
 	struct ice_sched_node *root;
 	struct ice_hw *hw;
-	u16 max_children;
 
 	if (!pi)
 		return ICE_ERR_PARAM;
@@ -28,8 +27,8 @@ ice_sched_add_root_node(struct ice_port_
 	if (!root)
 		return ICE_ERR_NO_MEMORY;
 
-	max_children = le16_to_cpu(hw->layer_info[0].max_children);
-	root->children = devm_kcalloc(ice_hw_to_dev(hw), max_children,
+	/* coverity[suspicious_sizeof] */
+	root->children = devm_kcalloc(ice_hw_to_dev(hw), hw->max_children[0],
 				      sizeof(*root), GFP_KERNEL);
 	if (!root->children) {
 		devm_kfree(ice_hw_to_dev(hw), root);
@@ -100,7 +99,6 @@ ice_sched_add_node(struct ice_port_info
 	struct ice_sched_node *parent;
 	struct ice_sched_node *node;
 	struct ice_hw *hw;
-	u16 max_children;
 
 	if (!pi)
 		return ICE_ERR_PARAM;
@@ -120,9 +118,10 @@ ice_sched_add_node(struct ice_port_info
 	node = devm_kzalloc(ice_hw_to_dev(hw), sizeof(*node), GFP_KERNEL);
 	if (!node)
 		return ICE_ERR_NO_MEMORY;
-	max_children = le16_to_cpu(hw->layer_info[layer].max_children);
-	if (max_children) {
-		node->children = devm_kcalloc(ice_hw_to_dev(hw), max_children,
+	if (hw->max_children[layer]) {
+		/* coverity[suspicious_sizeof] */
+		node->children = devm_kcalloc(ice_hw_to_dev(hw),
+					      hw->max_children[layer],
 					      sizeof(*node), GFP_KERNEL);
 		if (!node->children) {
 			devm_kfree(ice_hw_to_dev(hw), node);
@@ -192,14 +191,17 @@ ice_sched_remove_elems(struct ice_hw *hw
 	buf = devm_kzalloc(ice_hw_to_dev(hw), buf_size, GFP_KERNEL);
 	if (!buf)
 		return ICE_ERR_NO_MEMORY;
+
 	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]);
+
 	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 elements failed\n");
+
 	devm_kfree(ice_hw_to_dev(hw), buf);
 	return status;
 }
@@ -592,13 +594,16 @@ static void ice_sched_clear_port(struct
  */
 void ice_sched_cleanup_all(struct ice_hw *hw)
 {
-	if (!hw || !hw->port_info)
+	if (!hw)
 		return;
 
-	if (hw->layer_info)
+	if (hw->layer_info) {
 		devm_kfree(ice_hw_to_dev(hw), hw->layer_info);
+		hw->layer_info = NULL;
+	}
 
-	ice_sched_clear_port(hw->port_info);
+	if (hw->port_info)
+		ice_sched_clear_port(hw->port_info);
 
 	hw->num_tx_sched_layers = 0;
 	hw->num_tx_sched_phys_layers = 0;
@@ -671,9 +676,13 @@ ice_sched_add_elems(struct ice_port_info
 			ICE_AQC_ELEM_VALID_EIR;
 		buf->generic[i].data.generic = 0;
 		buf->generic[i].data.cir_bw.bw_profile_idx =
-			ICE_SCHED_DFLT_RL_PROF_ID;
+			cpu_to_le16(ICE_SCHED_DFLT_RL_PROF_ID);
+		buf->generic[i].data.cir_bw.bw_alloc =
+			cpu_to_le16(ICE_SCHED_DFLT_BW_WT);
 		buf->generic[i].data.eir_bw.bw_profile_idx =
-			ICE_SCHED_DFLT_RL_PROF_ID;
+			cpu_to_le16(ICE_SCHED_DFLT_RL_PROF_ID);
+		buf->generic[i].data.eir_bw.bw_alloc =
+			cpu_to_le16(ICE_SCHED_DFLT_BW_WT);
 	}
 
 	status = ice_aq_add_sched_elems(hw, 1, buf, buf_size,
@@ -697,7 +706,6 @@ ice_sched_add_elems(struct ice_port_info
 
 		teid = le32_to_cpu(buf->generic[i].node_teid);
 		new_node = ice_sched_find_node_by_teid(parent, teid);
-
 		if (!new_node) {
 			ice_debug(hw, ICE_DBG_SCHED,
 				  "Node is missing for teid =%d\n", teid);
@@ -710,7 +718,6 @@ ice_sched_add_elems(struct ice_port_info
 		/* add it to previous node sibling pointer */
 		/* Note: siblings are not linked across branches */
 		prev = ice_sched_get_first_node(hw, tc_node, layer);
-
 		if (prev && prev != new_node) {
 			while (prev->sibling)
 				prev = prev->sibling;
@@ -760,8 +767,7 @@ ice_sched_add_nodes_to_layer(struct ice_
 		return ICE_ERR_PARAM;
 
 	/* max children per node per layer */
-	max_child_nodes =
-	    le16_to_cpu(hw->layer_info[parent->tx_sched_layer].max_children);
+	max_child_nodes = hw->max_children[parent->tx_sched_layer];
 
 	/* current number of children + required nodes exceed max children ? */
 	if ((parent->num_children + num_nodes) > max_child_nodes) {
@@ -851,78 +857,6 @@ static u8 ice_sched_get_vsi_layer(struct
 }
 
 /**
- * ice_sched_get_num_nodes_per_layer - Get the total number of nodes per layer
- * @pi: pointer to the port info struct
- * @layer: layer number
- *
- * This function calculates the number of nodes present in the scheduler tree
- * including all the branches for a given layer
- */
-static u16
-ice_sched_get_num_nodes_per_layer(struct ice_port_info *pi, u8 layer)
-{
-	struct ice_hw *hw;
-	u16 num_nodes = 0;
-	u8 i;
-
-	if (!pi)
-		return num_nodes;
-
-	hw = pi->hw;
-
-	/* Calculate the number of nodes for all TCs */
-	for (i = 0; i < pi->root->num_children; i++) {
-		struct ice_sched_node *tc_node, *node;
-
-		tc_node = pi->root->children[i];
-
-		/* Get the first node */
-		node = ice_sched_get_first_node(hw, tc_node, layer);
-		if (!node)
-			continue;
-
-		/* count the siblings */
-		while (node) {
-			num_nodes++;
-			node = node->sibling;
-		}
-	}
-
-	return num_nodes;
-}
-
-/**
- * ice_sched_val_max_nodes - check max number of nodes reached or not
- * @pi: port information structure
- * @new_num_nodes_per_layer: pointer to the new number of nodes array
- *
- * This function checks whether the scheduler tree layers have enough space to
- * add new nodes
- */
-static enum ice_status
-ice_sched_validate_for_max_nodes(struct ice_port_info *pi,
-				 u16 *new_num_nodes_per_layer)
-{
-	struct ice_hw *hw = pi->hw;
-	u8 i, qg_layer;
-	u16 num_nodes;
-
-	qg_layer = ice_sched_get_qgrp_layer(hw);
-
-	/* walk through all the layers from SW entry point to qgroup layer */
-	for (i = hw->sw_entry_point_layer; i <= qg_layer; i++) {
-		num_nodes = ice_sched_get_num_nodes_per_layer(pi, i);
-		if (num_nodes + new_num_nodes_per_layer[i] >
-		    le16_to_cpu(hw->layer_info[i].max_pf_nodes)) {
-			ice_debug(hw, ICE_DBG_SCHED,
-				  "max nodes reached for layer = %d\n", i);
-			return ICE_ERR_CFG;
-		}
-	}
-	return 0;
-}
-
-/**
  * ice_rm_dflt_leaf_node - remove the default leaf node in the tree
  * @pi: port information structure
  *
@@ -1003,14 +937,12 @@ enum ice_status ice_sched_init_port(stru
 	hw = pi->hw;
 
 	/* Query the Default Topology from FW */
-	buf = devm_kcalloc(ice_hw_to_dev(hw), ICE_TXSCHED_MAX_BRANCHES,
-			   sizeof(*buf), GFP_KERNEL);
+	buf = devm_kzalloc(ice_hw_to_dev(hw), ICE_AQ_MAX_BUF_LEN, GFP_KERNEL);
 	if (!buf)
 		return ICE_ERR_NO_MEMORY;
 
 	/* Query default scheduling tree topology */
-	status = ice_aq_get_dflt_topo(hw, pi->lport, buf,
-				      sizeof(*buf) * ICE_TXSCHED_MAX_BRANCHES,
+	status = ice_aq_get_dflt_topo(hw, pi->lport, buf, ICE_AQ_MAX_BUF_LEN,
 				      &num_branches, NULL);
 	if (status)
 		goto err_init_port;
@@ -1097,6 +1029,8 @@ enum ice_status ice_sched_query_res_allo
 {
 	struct ice_aqc_query_txsched_res_resp *buf;
 	enum ice_status status = 0;
+	__le16 max_sibl;
+	u8 i;
 
 	if (hw->layer_info)
 		return status;
@@ -1115,7 +1049,20 @@ enum ice_status ice_sched_query_res_allo
 	hw->flattened_layers = buf->sched_props.flattening_bitmap;
 	hw->max_cgds = buf->sched_props.max_pf_cgds;
 
-	 hw->layer_info = devm_kmemdup(ice_hw_to_dev(hw), buf->layer_props,
+	/* max sibling group size of current layer refers to the max children
+	 * of the below layer node.
+	 * layer 1 node max children will be layer 2 max sibling group size
+	 * layer 2 node max children will be layer 3 max sibling group size
+	 * and so on. This array will be populated from root (index 0) to
+	 * qgroup layer 7. Leaf node has no children.
+	 */
+	for (i = 0; i < hw->num_tx_sched_layers; i++) {
+		max_sibl = buf->layer_props[i].max_sibl_grp_sz;
+		hw->max_children[i] = le16_to_cpu(max_sibl);
+	}
+
+	hw->layer_info = (struct ice_aqc_layer_props *)
+			  devm_kmemdup(ice_hw_to_dev(hw), buf->layer_props,
 				       (hw->num_tx_sched_layers *
 					sizeof(*hw->layer_info)),
 				       GFP_KERNEL);
@@ -1202,7 +1149,7 @@ ice_sched_get_free_qparent(struct ice_po
 	u8 qgrp_layer;
 
 	qgrp_layer = ice_sched_get_qgrp_layer(pi->hw);
-	max_children = le16_to_cpu(pi->hw->layer_info[qgrp_layer].max_children);
+	max_children = pi->hw->max_children[qgrp_layer];
 
 	list_elem = ice_sched_get_vsi_info_entry(pi, vsi_id);
 	if (!list_elem)
@@ -1278,10 +1225,8 @@ ice_sched_calc_vsi_child_nodes(struct ic
 
 	/* calculate num nodes from q group to VSI layer */
 	for (i = qgl; i > vsil; i--) {
-		u16 max_children = le16_to_cpu(hw->layer_info[i].max_children);
-
 		/* round to the next integer if there is a remainder */
-		num = DIV_ROUND_UP(num, max_children);
+		num = DIV_ROUND_UP(num, hw->max_children[i]);
 
 		/* need at least one node */
 		num_nodes[i] = num ? num : 1;
@@ -1311,16 +1256,13 @@ ice_sched_add_vsi_child_nodes(struct ice
 	u16 num_added = 0;
 	u8 i, qgl, vsil;
 
-	status = ice_sched_validate_for_max_nodes(pi, num_nodes);
-	if (status)
-		return status;
-
 	qgl = ice_sched_get_qgrp_layer(hw);
 	vsil = ice_sched_get_vsi_layer(hw);
 	parent = ice_sched_get_vsi_node(hw, tc_node, vsi_id);
 	for (i = vsil + 1; i <= qgl; i++) {
 		if (!parent)
 			return ICE_ERR_CFG;
+
 		status = ice_sched_add_nodes_to_layer(pi, tc_node, parent, i,
 						      num_nodes[i],
 						      &first_node_teid,
@@ -1398,8 +1340,8 @@ ice_sched_calc_vsi_support_nodes(struct
 				 struct ice_sched_node *tc_node, u16 *num_nodes)
 {
 	struct ice_sched_node *node;
-	u16 max_child;
-	u8 i, vsil;
+	u8 vsil;
+	int i;
 
 	vsil = ice_sched_get_vsi_layer(hw);
 	for (i = vsil; i >= hw->sw_entry_point_layer; i--)
@@ -1412,12 +1354,10 @@ ice_sched_calc_vsi_support_nodes(struct
 			/* If intermediate nodes are reached max children
 			 * then add a new one.
 			 */
-			node = ice_sched_get_first_node(hw, tc_node, i);
-			max_child = le16_to_cpu(hw->layer_info[i].max_children);
-
+			node = ice_sched_get_first_node(hw, tc_node, (u8)i);
 			/* scan all the siblings */
 			while (node) {
-				if (node->num_children < max_child)
+				if (node->num_children < hw->max_children[i])
 					break;
 				node = node->sibling;
 			}
@@ -1451,10 +1391,6 @@ ice_sched_add_vsi_support_nodes(struct i
 	if (!pi)
 		return ICE_ERR_PARAM;
 
-	status = ice_sched_validate_for_max_nodes(pi, num_nodes);
-	if (status)
-		return status;
-
 	vsil = ice_sched_get_vsi_layer(pi->hw);
 	for (i = pi->hw->sw_entry_point_layer; i <= vsil; i++) {
 		status = ice_sched_add_nodes_to_layer(pi, tc_node, parent,
@@ -1479,6 +1415,7 @@ ice_sched_add_vsi_support_nodes(struct i
 		if (i == vsil)
 			parent->vsi_id = vsi_id;
 	}
+
 	return 0;
 }
 
@@ -1633,9 +1570,11 @@ ice_sched_cfg_vsi(struct ice_port_info *
 		status = ice_sched_add_vsi_to_topo(pi, vsi_id, tc);
 		if (status)
 			return status;
+
 		vsi_node = ice_sched_get_vsi_node(hw, tc_node, vsi_id);
 		if (!vsi_node)
 			return ICE_ERR_CFG;
+
 		vsi->vsi_node[tc] = vsi_node;
 		vsi_node->in_use = true;
 	}
--- a/drivers/net/ethernet/intel/ice/ice_type.h
+++ b/drivers/net/ethernet/intel/ice/ice_type.h
@@ -204,6 +204,7 @@ enum ice_agg_type {
 };
 
 #define ICE_SCHED_DFLT_RL_PROF_ID	0
+#define ICE_SCHED_DFLT_BW_WT		1
 
 /* vsi type list entry to locate corresponding vsi/ag nodes */
 struct ice_sched_vsi_info {
@@ -286,6 +287,7 @@ struct ice_hw {
 	u8 flattened_layers;
 	u8 max_cgds;
 	u8 sw_entry_point_layer;
+	u16 max_children[ICE_AQC_TOPO_MAX_LEVEL_NUM];
 
 	u8 evb_veb;		/* true for VEB, false for VEPA */
 	struct ice_bus_info bus;