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Jiri Bencf0706e82007-05-05 11:45:53 -07001/*
2 * Copyright 2004, Instant802 Networks, Inc.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#include <linux/netdevice.h>
10#include <linux/skbuff.h>
11#include <linux/module.h>
12#include <linux/if_arp.h>
13#include <linux/types.h>
14#include <net/ip.h>
15#include <net/pkt_sched.h>
16
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "wme.h"
20
David S. Miller51cb6db2008-07-15 03:34:57 -070021/* Default mapping in classifier to work with default
Johannes Berge100bb62008-04-30 18:51:21 +020022 * queue setup.
23 */
Ron Rindjunsky9e723492008-01-28 14:07:18 +020024const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
Jiri Bencf0706e82007-05-05 11:45:53 -070025
Guy Cohena8bdf292008-01-09 19:12:48 +020026static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
Jiri Bencf0706e82007-05-05 11:45:53 -070027
David S. Miller51cb6db2008-07-15 03:34:57 -070028/* Given a data frame determine the 802.1p/1d tag to use. */
29static unsigned int classify_1d(struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -070030{
David S. Miller51cb6db2008-07-15 03:34:57 -070031 unsigned int dscp;
Jiri Bencf0706e82007-05-05 11:45:53 -070032
33 /* skb->priority values from 256->263 are magic values to
David S. Miller51cb6db2008-07-15 03:34:57 -070034 * directly indicate a specific 802.1d priority. This is used
35 * to allow 802.1d priority to be passed directly in from VLAN
36 * tags, etc.
37 */
Jiri Bencf0706e82007-05-05 11:45:53 -070038 if (skb->priority >= 256 && skb->priority <= 263)
39 return skb->priority - 256;
40
David S. Miller51cb6db2008-07-15 03:34:57 -070041 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -070042 case htons(ETH_P_IP):
David S. Miller51cb6db2008-07-15 03:34:57 -070043 dscp = ip_hdr(skb)->tos & 0xfc;
44 break;
45
46 default:
Jiri Bencf0706e82007-05-05 11:45:53 -070047 return 0;
David S. Miller51cb6db2008-07-15 03:34:57 -070048 }
Jiri Bencf0706e82007-05-05 11:45:53 -070049
Jiri Bencf0706e82007-05-05 11:45:53 -070050 return dscp >> 5;
51}
52
53
David S. Miller51cb6db2008-07-15 03:34:57 -070054static int wme_downgrade_ac(struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -070055{
56 switch (skb->priority) {
57 case 6:
58 case 7:
59 skb->priority = 5; /* VO -> VI */
60 return 0;
61 case 4:
62 case 5:
63 skb->priority = 3; /* VI -> BE */
64 return 0;
65 case 0:
66 case 3:
67 skb->priority = 2; /* BE -> BK */
68 return 0;
69 default:
70 return -1;
71 }
72}
73
74
David S. Miller51cb6db2008-07-15 03:34:57 -070075/* Indicate which queue to use. */
Johannes Bergb4a4bf52008-09-26 13:34:54 +020076static u16 classify80211(struct ieee80211_local *local, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -070077{
Jiri Bencf0706e82007-05-05 11:45:53 -070078 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Jiri Bencf0706e82007-05-05 11:45:53 -070079
Harvey Harrison002aaf42008-06-11 14:21:59 -070080 if (!ieee80211_is_data(hdr->frame_control)) {
Jiri Bencf0706e82007-05-05 11:45:53 -070081 /* management frames go on AC_VO queue, but are sent
82 * without QoS control fields */
Johannes Berge100bb62008-04-30 18:51:21 +020083 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -070084 }
85
Johannes Bergf9d540e2007-09-28 14:02:09 +020086 if (0 /* injected */) {
87 /* use AC from radiotap */
Jiri Bencf0706e82007-05-05 11:45:53 -070088 }
89
Harvey Harrison002aaf42008-06-11 14:21:59 -070090 if (!ieee80211_is_data_qos(hdr->frame_control)) {
Jiri Bencf0706e82007-05-05 11:45:53 -070091 skb->priority = 0; /* required for correct WPA/11i MIC */
92 return ieee802_1d_to_ac[skb->priority];
93 }
94
95 /* use the data classifier to determine what 802.1d tag the
Johannes Berg3c3b00c2007-08-28 17:01:55 -040096 * data frame has */
David S. Miller51cb6db2008-07-15 03:34:57 -070097 skb->priority = classify_1d(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -070098
Johannes Berg3c3b00c2007-08-28 17:01:55 -040099 /* in case we are a client verify acm is not set for this ac */
Jiri Bencf0706e82007-05-05 11:45:53 -0700100 while (unlikely(local->wmm_acm & BIT(skb->priority))) {
101 if (wme_downgrade_ac(skb)) {
David S. Miller51cb6db2008-07-15 03:34:57 -0700102 /* The old code would drop the packet in this
103 * case.
104 */
105 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700106 }
107 }
108
109 /* look up which queue to use for frames with this 1d tag */
110 return ieee802_1d_to_ac[skb->priority];
111}
112
David S. Miller51cb6db2008-07-15 03:34:57 -0700113u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700114{
Johannes Bergb4a4bf52008-09-26 13:34:54 +0200115 struct ieee80211_master_priv *mpriv = netdev_priv(dev);
116 struct ieee80211_local *local = mpriv->local;
Sujith8b30b1f2008-10-24 09:55:27 +0530117 struct ieee80211_hw *hw = &local->hw;
Jiri Bencf0706e82007-05-05 11:45:53 -0700118 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200119 struct sta_info *sta;
David S. Miller51cb6db2008-07-15 03:34:57 -0700120 u16 queue;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200121 u8 tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700122
Johannes Bergb4a4bf52008-09-26 13:34:54 +0200123 queue = classify80211(local, skb);
David S. Miller51cb6db2008-07-15 03:34:57 -0700124 if (unlikely(queue >= local->hw.queues))
125 queue = local->hw.queues - 1;
126
Sujith8b30b1f2008-10-24 09:55:27 +0530127 if (skb->requeue) {
128 if (!hw->ampdu_queues)
129 return queue;
130
Johannes Bergd0709a62008-02-25 16:27:46 +0100131 rcu_read_lock();
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200132 sta = sta_info_get(local, hdr->addr1);
Harvey Harrison238f74a2008-07-02 11:05:34 -0700133 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200134 if (sta) {
135 int ampdu_queue = sta->tid_to_tx_q[tid];
David S. Miller51cb6db2008-07-15 03:34:57 -0700136
137 if ((ampdu_queue < ieee80211_num_queues(hw)) &&
Sujith8b30b1f2008-10-24 09:55:27 +0530138 test_bit(ampdu_queue, local->queue_pool))
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200139 queue = ampdu_queue;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200140 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100141 rcu_read_unlock();
David S. Miller51cb6db2008-07-15 03:34:57 -0700142
143 return queue;
Jiri Bencf0706e82007-05-05 11:45:53 -0700144 }
145
David S. Miller51cb6db2008-07-15 03:34:57 -0700146 /* Now we know the 1d priority, fill in the QoS header if
147 * there is one.
Jiri Bencf0706e82007-05-05 11:45:53 -0700148 */
Harvey Harrison002aaf42008-06-11 14:21:59 -0700149 if (ieee80211_is_data_qos(hdr->frame_control)) {
150 u8 *p = ieee80211_get_qos_ctl(hdr);
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200151 u8 ack_policy = 0;
Harvey Harrison238f74a2008-07-02 11:05:34 -0700152 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
Jiri Bencf0706e82007-05-05 11:45:53 -0700153 if (local->wifi_wme_noack_test)
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200154 ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
Jiri Bencf0706e82007-05-05 11:45:53 -0700155 QOS_CONTROL_ACK_POLICY_SHIFT;
156 /* qos header is 2 bytes, second reserved */
Harvey Harrison002aaf42008-06-11 14:21:59 -0700157 *p++ = ack_policy | tid;
Jiri Bencf0706e82007-05-05 11:45:53 -0700158 *p = 0;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200159
Sujith8b30b1f2008-10-24 09:55:27 +0530160 if (!hw->ampdu_queues)
161 return queue;
162
Johannes Bergd0709a62008-02-25 16:27:46 +0100163 rcu_read_lock();
164
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200165 sta = sta_info_get(local, hdr->addr1);
166 if (sta) {
167 int ampdu_queue = sta->tid_to_tx_q[tid];
David S. Miller51cb6db2008-07-15 03:34:57 -0700168
169 if ((ampdu_queue < ieee80211_num_queues(hw)) &&
Sujith8b30b1f2008-10-24 09:55:27 +0530170 test_bit(ampdu_queue, local->queue_pool))
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200171 queue = ampdu_queue;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200172 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100173
174 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700175 }
176
Jiri Bencf0706e82007-05-05 11:45:53 -0700177 return queue;
178}
179
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200180int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
David S. Miller51cb6db2008-07-15 03:34:57 -0700181 struct sta_info *sta, u16 tid)
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200182{
183 int i;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200184
Johannes Bergd0f09802008-07-29 11:32:07 +0200185 /* XXX: currently broken due to cb/requeue use */
186 return -EPERM;
187
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200188 /* prepare the filter and save it for the SW queue
Johannes Berge100bb62008-04-30 18:51:21 +0200189 * matching the received HW queue */
190
191 if (!local->hw.ampdu_queues)
192 return -EPERM;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200193
194 /* try to get a Qdisc from the pool */
David S. Miller51cb6db2008-07-15 03:34:57 -0700195 for (i = local->hw.queues; i < ieee80211_num_queues(&local->hw); i++)
196 if (!test_and_set_bit(i, local->queue_pool)) {
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200197 ieee80211_stop_queue(local_to_hw(local), i);
198 sta->tid_to_tx_q[tid] = i;
199
200 /* IF there are already pending packets
201 * on this tid first we need to drain them
202 * on the previous queue
203 * since HT is strict in order */
204#ifdef CONFIG_MAC80211_HT_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700205 if (net_ratelimit())
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200206 printk(KERN_DEBUG "allocated aggregation queue"
Johannes Berg0c68ae262008-10-27 15:56:10 -0700207 " %d tid %d addr %pM pool=0x%lX\n",
208 i, tid, sta->sta.addr,
David S. Miller51cb6db2008-07-15 03:34:57 -0700209 local->queue_pool[0]);
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200210#endif /* CONFIG_MAC80211_HT_DEBUG */
211 return 0;
212 }
213
214 return -EAGAIN;
215}
216
217/**
David S. Millere8a04642008-07-17 00:34:19 -0700218 * the caller needs to hold netdev_get_tx_queue(local->mdev, X)->lock
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200219 */
220void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
221 struct sta_info *sta, u16 tid,
222 u8 requeue)
223{
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200224 int agg_queue = sta->tid_to_tx_q[tid];
David S. Miller51cb6db2008-07-15 03:34:57 -0700225 struct ieee80211_hw *hw = &local->hw;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200226
227 /* return the qdisc to the pool */
David S. Miller51cb6db2008-07-15 03:34:57 -0700228 clear_bit(agg_queue, local->queue_pool);
229 sta->tid_to_tx_q[tid] = ieee80211_num_queues(hw);
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200230
David S. Miller51cb6db2008-07-15 03:34:57 -0700231 if (requeue) {
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200232 ieee80211_requeue(local, agg_queue);
David S. Miller51cb6db2008-07-15 03:34:57 -0700233 } else {
234 struct netdev_queue *txq;
David S. Miller83874002008-07-17 00:53:03 -0700235 spinlock_t *root_lock;
David S. Miller35ed4e72008-08-02 23:25:50 -0700236 struct Qdisc *q;
David S. Miller51cb6db2008-07-15 03:34:57 -0700237
238 txq = netdev_get_tx_queue(local->mdev, agg_queue);
David S. Miller35ed4e72008-08-02 23:25:50 -0700239 q = rcu_dereference(txq->qdisc);
240 root_lock = qdisc_lock(q);
David S. Miller51cb6db2008-07-15 03:34:57 -0700241
David S. Miller83874002008-07-17 00:53:03 -0700242 spin_lock_bh(root_lock);
David S. Miller35ed4e72008-08-02 23:25:50 -0700243 qdisc_reset(q);
David S. Miller83874002008-07-17 00:53:03 -0700244 spin_unlock_bh(root_lock);
David S. Miller51cb6db2008-07-15 03:34:57 -0700245 }
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200246}
247
248void ieee80211_requeue(struct ieee80211_local *local, int queue)
249{
David S. Miller51cb6db2008-07-15 03:34:57 -0700250 struct netdev_queue *txq = netdev_get_tx_queue(local->mdev, queue);
251 struct sk_buff_head list;
David S. Miller83874002008-07-17 00:53:03 -0700252 spinlock_t *root_lock;
David S. Miller51cb6db2008-07-15 03:34:57 -0700253 struct Qdisc *qdisc;
Ron Rindjunsky0da926f2008-04-23 13:45:12 +0300254 u32 len;
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200255
David S. Miller51cb6db2008-07-15 03:34:57 -0700256 rcu_read_lock_bh();
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200257
David S. Miller51cb6db2008-07-15 03:34:57 -0700258 qdisc = rcu_dereference(txq->qdisc);
259 if (!qdisc || !qdisc->dequeue)
260 goto out_unlock;
261
262 skb_queue_head_init(&list);
263
David S. Miller83874002008-07-17 00:53:03 -0700264 root_lock = qdisc_root_lock(qdisc);
265 spin_lock(root_lock);
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200266 for (len = qdisc->q.qlen; len > 0; len--) {
David S. Miller51cb6db2008-07-15 03:34:57 -0700267 struct sk_buff *skb = qdisc->dequeue(qdisc);
268
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200269 if (skb)
David S. Miller51cb6db2008-07-15 03:34:57 -0700270 __skb_queue_tail(&list, skb);
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200271 }
David S. Miller83874002008-07-17 00:53:03 -0700272 spin_unlock(root_lock);
David S. Miller51cb6db2008-07-15 03:34:57 -0700273
274 for (len = list.qlen; len > 0; len--) {
275 struct sk_buff *skb = __skb_dequeue(&list);
276 u16 new_queue;
277
278 BUG_ON(!skb);
279 new_queue = ieee80211_select_queue(local->mdev, skb);
280 skb_set_queue_mapping(skb, new_queue);
281
282 txq = netdev_get_tx_queue(local->mdev, new_queue);
283
David S. Miller51cb6db2008-07-15 03:34:57 -0700284
285 qdisc = rcu_dereference(txq->qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700286 root_lock = qdisc_root_lock(qdisc);
David S. Miller51cb6db2008-07-15 03:34:57 -0700287
David S. Miller83874002008-07-17 00:53:03 -0700288 spin_lock(root_lock);
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700289 qdisc_enqueue_root(skb, qdisc);
David S. Miller83874002008-07-17 00:53:03 -0700290 spin_unlock(root_lock);
David S. Miller51cb6db2008-07-15 03:34:57 -0700291 }
292
293out_unlock:
294 rcu_read_unlock_bh();
Ron Rindjunsky9e723492008-01-28 14:07:18 +0200295}