304 lines
7.2 KiB
C
304 lines
7.2 KiB
C
/*
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* Copyright 2004, Instant802 Networks, Inc.
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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/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/types.h>
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#include <net/ip.h>
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#include <net/pkt_sched.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "wme.h"
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/* Default mapping in classifier to work with default
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* queue setup.
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*/
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const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
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static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
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/* Given a data frame determine the 802.1p/1d tag to use. */
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static unsigned int classify_1d(struct sk_buff *skb)
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{
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unsigned int dscp;
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/* skb->priority values from 256->263 are magic values to
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* directly indicate a specific 802.1d priority. This is used
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* to allow 802.1d priority to be passed directly in from VLAN
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* tags, etc.
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*/
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if (skb->priority >= 256 && skb->priority <= 263)
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return skb->priority - 256;
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switch (skb->protocol) {
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case __constant_htons(ETH_P_IP):
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dscp = ip_hdr(skb)->tos & 0xfc;
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break;
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default:
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return 0;
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}
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if (dscp & 0x1c)
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return 0;
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return dscp >> 5;
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}
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static int wme_downgrade_ac(struct sk_buff *skb)
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{
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switch (skb->priority) {
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case 6:
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case 7:
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skb->priority = 5; /* VO -> VI */
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return 0;
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case 4:
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case 5:
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skb->priority = 3; /* VI -> BE */
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return 0;
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case 0:
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case 3:
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skb->priority = 2; /* BE -> BK */
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return 0;
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default:
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return -1;
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}
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}
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/* Indicate which queue to use. */
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static u16 classify80211(struct sk_buff *skb, struct net_device *dev)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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if (!ieee80211_is_data(hdr->frame_control)) {
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/* management frames go on AC_VO queue, but are sent
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* without QoS control fields */
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return 0;
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}
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if (0 /* injected */) {
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/* use AC from radiotap */
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}
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if (!ieee80211_is_data_qos(hdr->frame_control)) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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return ieee802_1d_to_ac[skb->priority];
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}
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/* use the data classifier to determine what 802.1d tag the
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* data frame has */
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skb->priority = classify_1d(skb);
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/* in case we are a client verify acm is not set for this ac */
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while (unlikely(local->wmm_acm & BIT(skb->priority))) {
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if (wme_downgrade_ac(skb)) {
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/* The old code would drop the packet in this
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* case.
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*/
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return 0;
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}
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}
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/* look up which queue to use for frames with this 1d tag */
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return ieee802_1d_to_ac[skb->priority];
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}
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u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct sta_info *sta;
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u16 queue;
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u8 tid;
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queue = classify80211(skb, dev);
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if (unlikely(queue >= local->hw.queues))
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queue = local->hw.queues - 1;
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if (info->flags & IEEE80211_TX_CTL_REQUEUE) {
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rcu_read_lock();
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sta = sta_info_get(local, hdr->addr1);
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tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
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if (sta) {
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struct ieee80211_hw *hw = &local->hw;
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int ampdu_queue = sta->tid_to_tx_q[tid];
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if ((ampdu_queue < ieee80211_num_queues(hw)) &&
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test_bit(ampdu_queue, local->queue_pool)) {
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queue = ampdu_queue;
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info->flags |= IEEE80211_TX_CTL_AMPDU;
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} else {
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info->flags &= ~IEEE80211_TX_CTL_AMPDU;
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}
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}
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rcu_read_unlock();
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return queue;
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}
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/* Now we know the 1d priority, fill in the QoS header if
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* there is one.
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*/
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if (ieee80211_is_data_qos(hdr->frame_control)) {
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u8 *p = ieee80211_get_qos_ctl(hdr);
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u8 ack_policy = 0;
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tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
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if (local->wifi_wme_noack_test)
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ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
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QOS_CONTROL_ACK_POLICY_SHIFT;
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/* qos header is 2 bytes, second reserved */
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*p++ = ack_policy | tid;
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*p = 0;
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rcu_read_lock();
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sta = sta_info_get(local, hdr->addr1);
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if (sta) {
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int ampdu_queue = sta->tid_to_tx_q[tid];
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struct ieee80211_hw *hw = &local->hw;
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if ((ampdu_queue < ieee80211_num_queues(hw)) &&
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test_bit(ampdu_queue, local->queue_pool)) {
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queue = ampdu_queue;
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info->flags |= IEEE80211_TX_CTL_AMPDU;
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} else {
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info->flags &= ~IEEE80211_TX_CTL_AMPDU;
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}
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}
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rcu_read_unlock();
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}
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return queue;
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}
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int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
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struct sta_info *sta, u16 tid)
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{
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int i;
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/* XXX: currently broken due to cb/requeue use */
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return -EPERM;
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/* prepare the filter and save it for the SW queue
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* matching the received HW queue */
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if (!local->hw.ampdu_queues)
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return -EPERM;
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/* try to get a Qdisc from the pool */
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for (i = local->hw.queues; i < ieee80211_num_queues(&local->hw); i++)
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if (!test_and_set_bit(i, local->queue_pool)) {
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ieee80211_stop_queue(local_to_hw(local), i);
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sta->tid_to_tx_q[tid] = i;
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/* IF there are already pending packets
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* on this tid first we need to drain them
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* on the previous queue
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* since HT is strict in order */
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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit()) {
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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "allocated aggregation queue"
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" %d tid %d addr %s pool=0x%lX\n",
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i, tid, print_mac(mac, sta->addr),
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local->queue_pool[0]);
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}
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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return 0;
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}
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return -EAGAIN;
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}
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/**
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* the caller needs to hold netdev_get_tx_queue(local->mdev, X)->lock
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*/
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void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
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struct sta_info *sta, u16 tid,
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u8 requeue)
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{
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int agg_queue = sta->tid_to_tx_q[tid];
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struct ieee80211_hw *hw = &local->hw;
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/* return the qdisc to the pool */
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clear_bit(agg_queue, local->queue_pool);
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sta->tid_to_tx_q[tid] = ieee80211_num_queues(hw);
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if (requeue) {
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ieee80211_requeue(local, agg_queue);
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} else {
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struct netdev_queue *txq;
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spinlock_t *root_lock;
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struct Qdisc *q;
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txq = netdev_get_tx_queue(local->mdev, agg_queue);
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q = rcu_dereference(txq->qdisc);
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root_lock = qdisc_lock(q);
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spin_lock_bh(root_lock);
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qdisc_reset(q);
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spin_unlock_bh(root_lock);
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}
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}
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void ieee80211_requeue(struct ieee80211_local *local, int queue)
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{
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struct netdev_queue *txq = netdev_get_tx_queue(local->mdev, queue);
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struct sk_buff_head list;
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spinlock_t *root_lock;
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struct Qdisc *qdisc;
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u32 len;
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rcu_read_lock_bh();
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qdisc = rcu_dereference(txq->qdisc);
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if (!qdisc || !qdisc->dequeue)
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goto out_unlock;
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skb_queue_head_init(&list);
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root_lock = qdisc_root_lock(qdisc);
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spin_lock(root_lock);
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for (len = qdisc->q.qlen; len > 0; len--) {
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struct sk_buff *skb = qdisc->dequeue(qdisc);
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if (skb)
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__skb_queue_tail(&list, skb);
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}
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spin_unlock(root_lock);
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for (len = list.qlen; len > 0; len--) {
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struct sk_buff *skb = __skb_dequeue(&list);
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u16 new_queue;
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BUG_ON(!skb);
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new_queue = ieee80211_select_queue(local->mdev, skb);
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skb_set_queue_mapping(skb, new_queue);
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txq = netdev_get_tx_queue(local->mdev, new_queue);
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qdisc = rcu_dereference(txq->qdisc);
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root_lock = qdisc_root_lock(qdisc);
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spin_lock(root_lock);
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qdisc_enqueue_root(skb, qdisc);
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spin_unlock(root_lock);
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}
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out_unlock:
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rcu_read_unlock_bh();
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}
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