![Pavel Emelyanov](/assets/img/avatar_default.png)
Many-many code in the kernel initialized the timer->function and timer->data together with calling init_timer(timer). There is already a helper for this. Use it for networking code. The patch is HUGE, but makes the code 130 lines shorter (98 insertions(+), 228 deletions(-)). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
412 lines
9.7 KiB
C
412 lines
9.7 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "ieee80211_rate.h"
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#include "sta_info.h"
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#include "debugfs_sta.h"
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/* Caller must hold local->sta_lock */
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static void sta_info_hash_add(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
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local->sta_hash[STA_HASH(sta->addr)] = sta;
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}
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/* Caller must hold local->sta_lock */
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static int sta_info_hash_del(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct sta_info *s;
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s = local->sta_hash[STA_HASH(sta->addr)];
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if (!s)
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return -ENOENT;
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if (s == sta) {
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local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
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return 0;
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}
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while (s->hnext && s->hnext != sta)
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s = s->hnext;
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if (s->hnext) {
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s->hnext = sta->hnext;
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return 0;
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}
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return -ENOENT;
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}
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struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
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{
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struct sta_info *sta;
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read_lock_bh(&local->sta_lock);
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sta = local->sta_hash[STA_HASH(addr)];
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while (sta) {
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if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
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__sta_info_get(sta);
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break;
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}
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sta = sta->hnext;
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}
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read_unlock_bh(&local->sta_lock);
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return sta;
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}
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EXPORT_SYMBOL(sta_info_get);
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int sta_info_min_txrate_get(struct ieee80211_local *local)
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{
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struct sta_info *sta;
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struct ieee80211_hw_mode *mode;
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int min_txrate = 9999999;
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int i;
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read_lock_bh(&local->sta_lock);
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mode = local->oper_hw_mode;
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for (i = 0; i < STA_HASH_SIZE; i++) {
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sta = local->sta_hash[i];
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while (sta) {
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if (sta->txrate < min_txrate)
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min_txrate = sta->txrate;
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sta = sta->hnext;
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}
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}
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read_unlock_bh(&local->sta_lock);
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if (min_txrate == 9999999)
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min_txrate = 0;
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return mode->rates[min_txrate].rate;
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}
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static void sta_info_release(struct kref *kref)
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{
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struct sta_info *sta = container_of(kref, struct sta_info, kref);
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struct ieee80211_local *local = sta->local;
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struct sk_buff *skb;
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/* free sta structure; it has already been removed from
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* hash table etc. external structures. Make sure that all
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* buffered frames are release (one might have been added
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* after sta_info_free() was called). */
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while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
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local->total_ps_buffered--;
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dev_kfree_skb_any(skb);
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}
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while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
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dev_kfree_skb_any(skb);
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}
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rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
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rate_control_put(sta->rate_ctrl);
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kfree(sta);
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}
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void sta_info_put(struct sta_info *sta)
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{
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kref_put(&sta->kref, sta_info_release);
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}
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EXPORT_SYMBOL(sta_info_put);
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struct sta_info * sta_info_add(struct ieee80211_local *local,
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struct net_device *dev, u8 *addr, gfp_t gfp)
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{
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struct sta_info *sta;
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DECLARE_MAC_BUF(mac);
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sta = kzalloc(sizeof(*sta), gfp);
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if (!sta)
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return NULL;
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kref_init(&sta->kref);
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sta->rate_ctrl = rate_control_get(local->rate_ctrl);
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sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
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if (!sta->rate_ctrl_priv) {
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rate_control_put(sta->rate_ctrl);
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kfree(sta);
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return NULL;
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}
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memcpy(sta->addr, addr, ETH_ALEN);
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sta->local = local;
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sta->dev = dev;
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skb_queue_head_init(&sta->ps_tx_buf);
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skb_queue_head_init(&sta->tx_filtered);
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__sta_info_get(sta); /* sta used by caller, decremented by
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* sta_info_put() */
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write_lock_bh(&local->sta_lock);
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list_add(&sta->list, &local->sta_list);
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local->num_sta++;
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sta_info_hash_add(local, sta);
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if (local->ops->sta_notify)
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local->ops->sta_notify(local_to_hw(local), dev->ifindex,
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STA_NOTIFY_ADD, addr);
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write_unlock_bh(&local->sta_lock);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Added STA %s\n",
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wiphy_name(local->hw.wiphy), print_mac(mac, addr));
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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#ifdef CONFIG_MAC80211_DEBUGFS
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/* debugfs entry adding might sleep, so schedule process
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* context task for adding entry for STAs that do not yet
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* have one. */
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queue_work(local->hw.workqueue, &local->sta_debugfs_add);
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#endif
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return sta;
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}
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/* Caller must hold local->sta_lock */
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void sta_info_remove(struct sta_info *sta)
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{
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata;
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/* don't do anything if we've been removed already */
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if (sta_info_hash_del(local, sta))
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return;
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list_del(&sta->list);
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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if (sta->flags & WLAN_STA_PS) {
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sta->flags &= ~WLAN_STA_PS;
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if (sdata->bss)
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atomic_dec(&sdata->bss->num_sta_ps);
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}
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local->num_sta--;
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sta_info_remove_aid_ptr(sta);
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}
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void sta_info_free(struct sta_info *sta)
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{
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struct sk_buff *skb;
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struct ieee80211_local *local = sta->local;
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DECLARE_MAC_BUF(mac);
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might_sleep();
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write_lock_bh(&local->sta_lock);
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sta_info_remove(sta);
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write_unlock_bh(&local->sta_lock);
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while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
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local->total_ps_buffered--;
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dev_kfree_skb(skb);
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}
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while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
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dev_kfree_skb(skb);
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}
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Removed STA %s\n",
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wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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ieee80211_key_free(sta->key);
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sta->key = NULL;
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if (local->ops->sta_notify)
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local->ops->sta_notify(local_to_hw(local), sta->dev->ifindex,
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STA_NOTIFY_REMOVE, sta->addr);
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rate_control_remove_sta_debugfs(sta);
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ieee80211_sta_debugfs_remove(sta);
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sta_info_put(sta);
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}
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static inline int sta_info_buffer_expired(struct ieee80211_local *local,
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struct sta_info *sta,
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struct sk_buff *skb)
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{
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struct ieee80211_tx_packet_data *pkt_data;
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int timeout;
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if (!skb)
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return 0;
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pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
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/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
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timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
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15625) * HZ;
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if (timeout < STA_TX_BUFFER_EXPIRE)
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timeout = STA_TX_BUFFER_EXPIRE;
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return time_after(jiffies, pkt_data->jiffies + timeout);
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}
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static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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unsigned long flags;
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struct sk_buff *skb;
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DECLARE_MAC_BUF(mac);
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if (skb_queue_empty(&sta->ps_tx_buf))
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return;
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for (;;) {
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spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
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skb = skb_peek(&sta->ps_tx_buf);
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if (sta_info_buffer_expired(local, sta, skb)) {
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skb = __skb_dequeue(&sta->ps_tx_buf);
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if (skb_queue_empty(&sta->ps_tx_buf))
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sta->flags &= ~WLAN_STA_TIM;
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} else
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skb = NULL;
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spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
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if (skb) {
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local->total_ps_buffered--;
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printk(KERN_DEBUG "Buffered frame expired (STA "
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"%s)\n", print_mac(mac, sta->addr));
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dev_kfree_skb(skb);
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} else
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break;
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}
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}
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static void sta_info_cleanup(unsigned long data)
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{
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struct ieee80211_local *local = (struct ieee80211_local *) data;
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struct sta_info *sta;
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read_lock_bh(&local->sta_lock);
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list_for_each_entry(sta, &local->sta_list, list) {
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__sta_info_get(sta);
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sta_info_cleanup_expire_buffered(local, sta);
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sta_info_put(sta);
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}
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read_unlock_bh(&local->sta_lock);
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local->sta_cleanup.expires =
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round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
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add_timer(&local->sta_cleanup);
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}
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#ifdef CONFIG_MAC80211_DEBUGFS
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static void sta_info_debugfs_add_task(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, sta_debugfs_add);
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struct sta_info *sta, *tmp;
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while (1) {
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sta = NULL;
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read_lock_bh(&local->sta_lock);
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list_for_each_entry(tmp, &local->sta_list, list) {
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if (!tmp->debugfs.dir) {
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sta = tmp;
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__sta_info_get(sta);
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break;
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}
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}
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read_unlock_bh(&local->sta_lock);
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if (!sta)
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break;
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ieee80211_sta_debugfs_add(sta);
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rate_control_add_sta_debugfs(sta);
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sta_info_put(sta);
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}
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}
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#endif
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void sta_info_init(struct ieee80211_local *local)
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{
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rwlock_init(&local->sta_lock);
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INIT_LIST_HEAD(&local->sta_list);
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setup_timer(&local->sta_cleanup, sta_info_cleanup,
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(unsigned long)local);
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local->sta_cleanup.expires =
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round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
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#ifdef CONFIG_MAC80211_DEBUGFS
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INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
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#endif
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}
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int sta_info_start(struct ieee80211_local *local)
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{
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add_timer(&local->sta_cleanup);
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return 0;
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}
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void sta_info_stop(struct ieee80211_local *local)
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{
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del_timer(&local->sta_cleanup);
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sta_info_flush(local, NULL);
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}
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void sta_info_remove_aid_ptr(struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata;
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if (sta->aid <= 0)
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return;
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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if (sdata->local->ops->set_tim)
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sdata->local->ops->set_tim(local_to_hw(sdata->local),
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sta->aid, 0);
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if (sdata->bss)
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__bss_tim_clear(sdata->bss, sta->aid);
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}
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/**
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* sta_info_flush - flush matching STA entries from the STA table
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* @local: local interface data
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* @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
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*/
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void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
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{
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struct sta_info *sta, *tmp;
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LIST_HEAD(tmp_list);
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write_lock_bh(&local->sta_lock);
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list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
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if (!dev || dev == sta->dev) {
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__sta_info_get(sta);
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sta_info_remove(sta);
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list_add_tail(&sta->list, &tmp_list);
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}
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write_unlock_bh(&local->sta_lock);
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list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
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sta_info_free(sta);
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sta_info_put(sta);
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}
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}
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