text: // SPDX-License-Identifier: GPL-2.0+
  /* Copyright (c) 2015-2016 Quantenna Communications. All rights reserved. */
  
  #include "util.h"
  #include "qtn_hw_ids.h"
  
  void qtnf_sta_list_init(struct qtnf_sta_list *list)
  {
  	if (unlikely(!list))
  		return;
  
  	INIT_LIST_HEAD(&list->head);
  	atomic_set(&list->size, 0);
  }
  
  struct qtnf_sta_node *qtnf_sta_list_lookup(struct qtnf_sta_list *list,
  					   const u8 *mac)
  {
  	struct qtnf_sta_node *node;
  
  	if (unlikely(!mac))
  		return NULL;
  
  	list_for_each_entry(node, &list->head, list) {
  		if (ether_addr_equal(node->mac_addr, mac))
  			return node;
  	}
  
  	return NULL;
  }
  
  struct qtnf_sta_node *qtnf_sta_list_lookup_index(struct qtnf_sta_list *list,
  						 size_t index)
  {
  	struct qtnf_sta_node *node;
  
  	if (qtnf_sta_list_size(list) <= index)
  		return NULL;
  
  	list_for_each_entry(node, &list->head, list) {
  		if (index-- == 0)
  			return node;
  	}
  
  	return NULL;
  }
  
  struct qtnf_sta_node *qtnf_sta_list_add(struct qtnf_vif *vif,
  					const u8 *mac)
  {
  	struct qtnf_sta_list *list = &vif->sta_list;
  	struct qtnf_sta_node *node;
  
  	if (unlikely(!mac))
  		return NULL;
  
  	node = qtnf_sta_list_lookup(list, mac);
  
  	if (node)
  		goto done;
  
  	node = kzalloc(sizeof(*node), GFP_KERNEL);
  	if (unlikely(!node))
  		goto done;
  
  	ether_addr_copy(node->mac_addr, mac);
  	list_add_tail(&node->list, &list->head);
  	atomic_inc(&list->size);
  	++vif->generation;
  
  done:
  	return node;
  }
  
  bool qtnf_sta_list_del(struct qtnf_vif *vif, const u8 *mac)
  {
  	struct qtnf_sta_list *list = &vif->sta_list;
  	struct qtnf_sta_node *node;
  	bool ret = false;
  
  	node = qtnf_sta_list_lookup(list, mac);
  
  	if (node) {
  		list_del(&node->list);
  		atomic_dec(&list->size);
  		kfree(node);
  		++vif->generation;
  		ret = true;
  	}
  
  	return ret;
  }
  
  void qtnf_sta_list_free(struct qtnf_sta_list *list)
  {
  	struct qtnf_sta_node *node, *tmp;
  
  	atomic_set(&list->size, 0);
  
  	list_for_each_entry_safe(node, tmp, &list->head, list) {
  		list_del(&node->list);
  		kfree(node);
  	}
  
  	INIT_LIST_HEAD(&list->head);
  }
  
  const char *qtnf_chipid_to_string(unsigned long chip_id)
  {
  	switch (chip_id) {
  	case QTN_CHIP_ID_TOPAZ:
  		return "Topaz";
  	case QTN_CHIP_ID_PEARL:
  		return "Pearl revA";
  	case QTN_CHIP_ID_PEARL_B:
  		return "Pearl revB";
  	case QTN_CHIP_ID_PEARL_C:
  		return "Pearl revC";
  	default:
  		return "unknown";
  	}
  }
  EXPORT_SYMBOL_GPL(qtnf_chipid_to_string);
  