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-rw-r--r--net/mac80211/wme.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
new file mode 100644
index 0000000..139b5f2
--- /dev/null
+++ b/net/mac80211/wme.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright 2004, Instant802 Networks, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <linux/if_arp.h>
+#include <linux/types.h>
+#include <net/ip.h>
+#include <net/pkt_sched.h>
+
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "wme.h"
+
+/* Default mapping in classifier to work with default
+ * queue setup.
+ */
+const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
+
+static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
+
+/* Given a data frame determine the 802.1p/1d tag to use. */
+static unsigned int classify_1d(struct sk_buff *skb)
+{
+ unsigned int dscp;
+
+ /* skb->priority values from 256->263 are magic values to
+ * directly indicate a specific 802.1d priority. This is used
+ * to allow 802.1d priority to be passed directly in from VLAN
+ * tags, etc.
+ */
+ if (skb->priority >= 256 && skb->priority <= 263)
+ return skb->priority - 256;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ dscp = ip_hdr(skb)->tos & 0xfc;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return dscp >> 5;
+}
+
+
+static int wme_downgrade_ac(struct sk_buff *skb)
+{
+ switch (skb->priority) {
+ case 6:
+ case 7:
+ skb->priority = 5; /* VO -> VI */
+ return 0;
+ case 4:
+ case 5:
+ skb->priority = 3; /* VI -> BE */
+ return 0;
+ case 0:
+ case 3:
+ skb->priority = 2; /* BE -> BK */
+ return 0;
+ default:
+ return -1;
+ }
+}
+
+
+/* Indicate which queue to use. */
+static u16 classify80211(struct ieee80211_local *local, struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+ if (!ieee80211_is_data(hdr->frame_control)) {
+ /* management frames go on AC_VO queue, but are sent
+ * without QoS control fields */
+ return 0;
+ }
+
+ if (0 /* injected */) {
+ /* use AC from radiotap */
+ }
+
+ if (!ieee80211_is_data_qos(hdr->frame_control)) {
+ skb->priority = 0; /* required for correct WPA/11i MIC */
+ return ieee802_1d_to_ac[skb->priority];
+ }
+
+ /* use the data classifier to determine what 802.1d tag the
+ * data frame has */
+ skb->priority = classify_1d(skb);
+
+ /* in case we are a client verify acm is not set for this ac */
+ while (unlikely(local->wmm_acm & BIT(skb->priority))) {
+ if (wme_downgrade_ac(skb)) {
+ /* The old code would drop the packet in this
+ * case.
+ */
+ return 0;
+ }
+ }
+
+ /* look up which queue to use for frames with this 1d tag */
+ return ieee802_1d_to_ac[skb->priority];
+}
+
+u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb)
+{
+ struct ieee80211_master_priv *mpriv = netdev_priv(dev);
+ struct ieee80211_local *local = mpriv->local;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct sta_info *sta;
+ u16 queue;
+ u8 tid;
+
+ queue = classify80211(local, skb);
+ if (unlikely(queue >= local->hw.queues))
+ queue = local->hw.queues - 1;
+
+ if (info->flags & IEEE80211_TX_CTL_REQUEUE) {
+ rcu_read_lock();
+ sta = sta_info_get(local, hdr->addr1);
+ tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+ if (sta) {
+ struct ieee80211_hw *hw = &local->hw;
+ int ampdu_queue = sta->tid_to_tx_q[tid];
+
+ if ((ampdu_queue < ieee80211_num_queues(hw)) &&
+ test_bit(ampdu_queue, local->queue_pool)) {
+ queue = ampdu_queue;
+ info->flags |= IEEE80211_TX_CTL_AMPDU;
+ } else {
+ info->flags &= ~IEEE80211_TX_CTL_AMPDU;
+ }
+ }
+ rcu_read_unlock();
+
+ return queue;
+ }
+
+ /* Now we know the 1d priority, fill in the QoS header if
+ * there is one.
+ */
+ if (ieee80211_is_data_qos(hdr->frame_control)) {
+ u8 *p = ieee80211_get_qos_ctl(hdr);
+ u8 ack_policy = 0;
+ tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+ if (local->wifi_wme_noack_test)
+ ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
+ QOS_CONTROL_ACK_POLICY_SHIFT;
+ /* qos header is 2 bytes, second reserved */
+ *p++ = ack_policy | tid;
+ *p = 0;
+
+ rcu_read_lock();
+
+ sta = sta_info_get(local, hdr->addr1);
+ if (sta) {
+ int ampdu_queue = sta->tid_to_tx_q[tid];
+ struct ieee80211_hw *hw = &local->hw;
+
+ if ((ampdu_queue < ieee80211_num_queues(hw)) &&
+ test_bit(ampdu_queue, local->queue_pool)) {
+ queue = ampdu_queue;
+ info->flags |= IEEE80211_TX_CTL_AMPDU;
+ } else {
+ info->flags &= ~IEEE80211_TX_CTL_AMPDU;
+ }
+ }
+
+ rcu_read_unlock();
+ }
+
+ return queue;
+}
+
+int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
+ struct sta_info *sta, u16 tid)
+{
+ int i;
+
+ /* XXX: currently broken due to cb/requeue use */
+ return -EPERM;
+
+ /* prepare the filter and save it for the SW queue
+ * matching the received HW queue */
+
+ if (!local->hw.ampdu_queues)
+ return -EPERM;
+
+ /* try to get a Qdisc from the pool */
+ for (i = local->hw.queues; i < ieee80211_num_queues(&local->hw); i++)
+ if (!test_and_set_bit(i, local->queue_pool)) {
+ ieee80211_stop_queue(local_to_hw(local), i);
+ sta->tid_to_tx_q[tid] = i;
+
+ /* IF there are already pending packets
+ * on this tid first we need to drain them
+ * on the previous queue
+ * since HT is strict in order */
+#ifdef CONFIG_MAC80211_HT_DEBUG
+ if (net_ratelimit()) {
+ DECLARE_MAC_BUF(mac);
+ printk(KERN_DEBUG "allocated aggregation queue"
+ " %d tid %d addr %s pool=0x%lX\n",
+ i, tid, print_mac(mac, sta->sta.addr),
+ local->queue_pool[0]);
+ }
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+ return 0;
+ }
+
+ return -EAGAIN;
+}
+
+/**
+ * the caller needs to hold netdev_get_tx_queue(local->mdev, X)->lock
+ */
+void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
+ struct sta_info *sta, u16 tid,
+ u8 requeue)
+{
+ int agg_queue = sta->tid_to_tx_q[tid];
+ struct ieee80211_hw *hw = &local->hw;
+
+ /* return the qdisc to the pool */
+ clear_bit(agg_queue, local->queue_pool);
+ sta->tid_to_tx_q[tid] = ieee80211_num_queues(hw);
+
+ if (requeue) {
+ ieee80211_requeue(local, agg_queue);
+ } else {
+ struct netdev_queue *txq;
+ spinlock_t *root_lock;
+ struct Qdisc *q;
+
+ txq = netdev_get_tx_queue(local->mdev, agg_queue);
+ q = rcu_dereference(txq->qdisc);
+ root_lock = qdisc_lock(q);
+
+ spin_lock_bh(root_lock);
+ qdisc_reset(q);
+ spin_unlock_bh(root_lock);
+ }
+}
+
+void ieee80211_requeue(struct ieee80211_local *local, int queue)
+{
+ struct netdev_queue *txq = netdev_get_tx_queue(local->mdev, queue);
+ struct sk_buff_head list;
+ spinlock_t *root_lock;
+ struct Qdisc *qdisc;
+ u32 len;
+
+ rcu_read_lock_bh();
+
+ qdisc = rcu_dereference(txq->qdisc);
+ if (!qdisc || !qdisc->dequeue)
+ goto out_unlock;
+
+ skb_queue_head_init(&list);
+
+ root_lock = qdisc_root_lock(qdisc);
+ spin_lock(root_lock);
+ for (len = qdisc->q.qlen; len > 0; len--) {
+ struct sk_buff *skb = qdisc->dequeue(qdisc);
+
+ if (skb)
+ __skb_queue_tail(&list, skb);
+ }
+ spin_unlock(root_lock);
+
+ for (len = list.qlen; len > 0; len--) {
+ struct sk_buff *skb = __skb_dequeue(&list);
+ u16 new_queue;
+
+ BUG_ON(!skb);
+ new_queue = ieee80211_select_queue(local->mdev, skb);
+ skb_set_queue_mapping(skb, new_queue);
+
+ txq = netdev_get_tx_queue(local->mdev, new_queue);
+
+
+ qdisc = rcu_dereference(txq->qdisc);
+ root_lock = qdisc_root_lock(qdisc);
+
+ spin_lock(root_lock);
+ qdisc_enqueue_root(skb, qdisc);
+ spin_unlock(root_lock);
+ }
+
+out_unlock:
+ rcu_read_unlock_bh();
+}
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