2 * Copyright 2004, Instant802 Networks, Inc.
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.
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>
15 #include <net/pkt_sched.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
21 /* maximum number of hardware queues we support. */
22 #define QD_MAX_QUEUES (IEEE80211_MAX_AMPDU_QUEUES + IEEE80211_MAX_QUEUES)
23 /* current number of hardware queues we support. */
24 #define QD_NUM(hw) ((hw)->queues + (hw)->ampdu_queues)
27 * Default mapping in classifier to work with default
30 const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
32 struct ieee80211_sched_data
34 unsigned long qdisc_pool[BITS_TO_LONGS(QD_MAX_QUEUES)];
35 struct tcf_proto *filter_list;
36 struct Qdisc *queues[QD_MAX_QUEUES];
37 struct sk_buff_head requeued[QD_MAX_QUEUES];
40 static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
42 /* given a data frame determine the 802.1p/1d tag to use */
43 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
49 struct ieee80211_sched_data *q = qdisc_priv(qd);
50 struct tcf_result res = { -1, 0 };
52 /* if there is a user set filter list, call out to that */
54 tc_classify(skb, q->filter_list, &res);
59 /* skb->priority values from 256->263 are magic values to
60 * directly indicate a specific 802.1d priority.
61 * This is used to allow 802.1d priority to be passed directly in
62 * from VLAN tags, etc. */
63 if (skb->priority >= 256 && skb->priority <= 263)
64 return skb->priority - 256;
66 /* check there is a valid IP header present */
67 offset = ieee80211_get_hdrlen_from_skb(skb);
68 if (skb->len < offset + sizeof(llc_ip_hdr) + sizeof(*ip) ||
69 memcmp(skb->data + offset, llc_ip_hdr, sizeof(llc_ip_hdr)))
72 ip = (struct iphdr *) (skb->data + offset + sizeof(llc_ip_hdr));
74 dscp = ip->tos & 0xfc;
81 static inline int wme_downgrade_ac(struct sk_buff *skb)
83 switch (skb->priority) {
86 skb->priority = 5; /* VO -> VI */
90 skb->priority = 3; /* VI -> BE */
94 skb->priority = 2; /* BE -> BK */
102 /* positive return value indicates which queue to use
103 * negative return value indicates to drop the frame */
104 static int classify80211(struct sk_buff *skb, struct Qdisc *qd)
106 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
107 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
108 unsigned short fc = le16_to_cpu(hdr->frame_control);
111 /* see if frame is data or non data frame */
112 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
113 /* management frames go on AC_VO queue, but are sent
114 * without QoS control fields */
118 if (0 /* injected */) {
119 /* use AC from radiotap */
122 /* is this a QoS frame? */
123 qos = fc & IEEE80211_STYPE_QOS_DATA;
126 skb->priority = 0; /* required for correct WPA/11i MIC */
127 return ieee802_1d_to_ac[skb->priority];
130 /* use the data classifier to determine what 802.1d tag the
132 skb->priority = classify_1d(skb, qd);
134 /* in case we are a client verify acm is not set for this ac */
135 while (unlikely(local->wmm_acm & BIT(skb->priority))) {
136 if (wme_downgrade_ac(skb)) {
137 /* No AC with lower priority has acm=0, drop packet. */
142 /* look up which queue to use for frames with this 1d tag */
143 return ieee802_1d_to_ac[skb->priority];
147 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
149 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
150 struct ieee80211_hw *hw = &local->hw;
151 struct ieee80211_sched_data *q = qdisc_priv(qd);
152 struct ieee80211_tx_packet_data *pkt_data =
153 (struct ieee80211_tx_packet_data *) skb->cb;
154 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
155 unsigned short fc = le16_to_cpu(hdr->frame_control);
157 struct sta_info *sta;
162 if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) {
163 queue = pkt_data->queue;
165 sta = sta_info_get(local, hdr->addr1);
166 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
168 int ampdu_queue = sta->tid_to_tx_q[tid];
169 if ((ampdu_queue < QD_NUM(hw)) &&
170 test_bit(ampdu_queue, q->qdisc_pool)) {
172 pkt_data->flags |= IEEE80211_TXPD_AMPDU;
174 pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
178 skb_queue_tail(&q->requeued[queue], skb);
183 queue = classify80211(skb, qd);
185 if (unlikely(queue >= local->hw.queues))
186 queue = local->hw.queues - 1;
188 /* now we know the 1d priority, fill in the QoS header if there is one
190 if (WLAN_FC_IS_QOS_DATA(fc)) {
191 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
193 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
194 if (local->wifi_wme_noack_test)
195 ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
196 QOS_CONTROL_ACK_POLICY_SHIFT;
197 /* qos header is 2 bytes, second reserved */
198 *p = ack_policy | tid;
204 sta = sta_info_get(local, hdr->addr1);
206 int ampdu_queue = sta->tid_to_tx_q[tid];
207 if ((ampdu_queue < QD_NUM(hw)) &&
208 test_bit(ampdu_queue, q->qdisc_pool)) {
210 pkt_data->flags |= IEEE80211_TXPD_AMPDU;
212 pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
219 if (unlikely(queue < 0)) {
223 tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
224 pkt_data->queue = (unsigned int) queue;
225 qdisc = q->queues[queue];
226 err = qdisc->enqueue(skb, qdisc);
227 if (err == NET_XMIT_SUCCESS) {
229 qd->bstats.bytes += skb->len;
230 qd->bstats.packets++;
231 return NET_XMIT_SUCCESS;
239 /* TODO: clean up the cases where master_hard_start_xmit
240 * returns non 0 - it shouldn't ever do that. Once done we
241 * can remove this function */
242 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
244 struct ieee80211_sched_data *q = qdisc_priv(qd);
245 struct ieee80211_tx_packet_data *pkt_data =
246 (struct ieee80211_tx_packet_data *) skb->cb;
250 /* we recorded which queue to use earlier! */
251 qdisc = q->queues[pkt_data->queue];
253 if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
262 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
264 struct ieee80211_sched_data *q = qdisc_priv(qd);
265 struct net_device *dev = qd->dev;
266 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
267 struct ieee80211_hw *hw = &local->hw;
272 /* check all the h/w queues in numeric/priority order */
273 for (queue = 0; queue < QD_NUM(hw); queue++) {
274 /* see if there is room in this hardware queue */
275 if ((test_bit(IEEE80211_LINK_STATE_XOFF,
276 &local->state[queue])) ||
277 (test_bit(IEEE80211_LINK_STATE_PENDING,
278 &local->state[queue])) ||
279 (!test_bit(queue, q->qdisc_pool)))
282 /* there is space - try and get a frame */
283 skb = skb_dequeue(&q->requeued[queue]);
289 qdisc = q->queues[queue];
290 skb = qdisc->dequeue(qdisc);
296 /* returning a NULL here when all the h/w queues are full means we
297 * never need to call netif_stop_queue in the driver */
302 static void wme_qdiscop_reset(struct Qdisc* qd)
304 struct ieee80211_sched_data *q = qdisc_priv(qd);
305 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
306 struct ieee80211_hw *hw = &local->hw;
309 /* QUESTION: should we have some hardware flush functionality here? */
311 for (queue = 0; queue < QD_NUM(hw); queue++) {
312 skb_queue_purge(&q->requeued[queue]);
313 qdisc_reset(q->queues[queue]);
319 static void wme_qdiscop_destroy(struct Qdisc* qd)
321 struct ieee80211_sched_data *q = qdisc_priv(qd);
322 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
323 struct ieee80211_hw *hw = &local->hw;
326 tcf_destroy_chain(q->filter_list);
327 q->filter_list = NULL;
329 for (queue = 0; queue < QD_NUM(hw); queue++) {
330 skb_queue_purge(&q->requeued[queue]);
331 qdisc_destroy(q->queues[queue]);
332 q->queues[queue] = &noop_qdisc;
337 /* called whenever parameters are updated on existing qdisc */
338 static int wme_qdiscop_tune(struct Qdisc *qd, struct nlattr *opt)
344 /* called during initial creation of qdisc on device */
345 static int wme_qdiscop_init(struct Qdisc *qd, struct nlattr *opt)
347 struct ieee80211_sched_data *q = qdisc_priv(qd);
348 struct net_device *dev = qd->dev;
349 struct ieee80211_local *local;
350 struct ieee80211_hw *hw;
353 /* check that device is a mac80211 device */
354 if (!dev->ieee80211_ptr ||
355 dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
358 local = wdev_priv(dev->ieee80211_ptr);
361 /* only allow on master dev */
362 if (dev != local->mdev)
365 /* ensure that we are root qdisc */
366 if (qd->parent != TC_H_ROOT)
369 if (qd->flags & TCQ_F_INGRESS)
372 /* if options were passed in, set them */
374 err = wme_qdiscop_tune(qd, opt);
376 /* create child queues */
377 for (i = 0; i < QD_NUM(hw); i++) {
378 skb_queue_head_init(&q->requeued[i]);
379 q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
382 q->queues[i] = &noop_qdisc;
383 printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
387 /* non-aggregation queues: reserve/mark as used */
388 for (i = 0; i < local->hw.queues; i++)
389 set_bit(i, q->qdisc_pool);
394 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
400 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
401 struct Qdisc *new, struct Qdisc **old)
403 struct ieee80211_sched_data *q = qdisc_priv(qd);
404 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
405 struct ieee80211_hw *hw = &local->hw;
406 unsigned long queue = arg - 1;
408 if (queue >= QD_NUM(hw))
415 *old = q->queues[queue];
416 q->queues[queue] = new;
424 static struct Qdisc *
425 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
427 struct ieee80211_sched_data *q = qdisc_priv(qd);
428 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
429 struct ieee80211_hw *hw = &local->hw;
430 unsigned long queue = arg - 1;
432 if (queue >= QD_NUM(hw))
435 return q->queues[queue];
439 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
441 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
442 struct ieee80211_hw *hw = &local->hw;
443 unsigned long queue = TC_H_MIN(classid);
445 if (queue - 1 >= QD_NUM(hw))
452 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
455 return wme_classop_get(qd, classid);
459 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
464 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
465 struct nlattr **tca, unsigned long *arg)
467 unsigned long cl = *arg;
468 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
469 struct ieee80211_hw *hw = &local->hw;
471 if (cl - 1 > QD_NUM(hw))
474 /* TODO: put code to program hardware queue parameters here,
475 * to allow programming from tc command line */
481 /* we don't support deleting hardware queues
482 * when we add WMM-SA support - TSPECs may be deleted here */
483 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
485 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
486 struct ieee80211_hw *hw = &local->hw;
488 if (cl - 1 > QD_NUM(hw))
494 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
495 struct sk_buff *skb, struct tcmsg *tcm)
497 struct ieee80211_sched_data *q = qdisc_priv(qd);
498 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
499 struct ieee80211_hw *hw = &local->hw;
501 if (cl - 1 > QD_NUM(hw))
503 tcm->tcm_handle = TC_H_MIN(cl);
504 tcm->tcm_parent = qd->handle;
505 tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
510 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
512 struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
513 struct ieee80211_hw *hw = &local->hw;
519 for (queue = 0; queue < QD_NUM(hw); queue++) {
520 if (arg->count < arg->skip) {
524 /* we should return classids for our internal queues here
525 * as well as the external ones */
526 if (arg->fn(qd, queue+1, arg) < 0) {
535 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
538 struct ieee80211_sched_data *q = qdisc_priv(qd);
543 return &q->filter_list;
547 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
548 * - these are the operations on the classes */
549 static const struct Qdisc_class_ops class_ops =
551 .graft = wme_classop_graft,
552 .leaf = wme_classop_leaf,
554 .get = wme_classop_get,
555 .put = wme_classop_put,
556 .change = wme_classop_change,
557 .delete = wme_classop_delete,
558 .walk = wme_classop_walk,
560 .tcf_chain = wme_classop_find_tcf,
561 .bind_tcf = wme_classop_bind,
562 .unbind_tcf = wme_classop_put,
564 .dump = wme_classop_dump_class,
568 /* queueing discipline operations */
569 static struct Qdisc_ops wme_qdisc_ops __read_mostly =
572 .cl_ops = &class_ops,
574 .priv_size = sizeof(struct ieee80211_sched_data),
576 .enqueue = wme_qdiscop_enqueue,
577 .dequeue = wme_qdiscop_dequeue,
578 .requeue = wme_qdiscop_requeue,
579 .drop = NULL, /* drop not needed since we are always the root qdisc */
581 .init = wme_qdiscop_init,
582 .reset = wme_qdiscop_reset,
583 .destroy = wme_qdiscop_destroy,
584 .change = wme_qdiscop_tune,
586 .dump = wme_qdiscop_dump,
590 void ieee80211_install_qdisc(struct net_device *dev)
594 qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops, TC_H_ROOT);
596 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
600 /* same handle as would be allocated by qdisc_alloc_handle() */
601 qdisc->handle = 0x80010000;
603 qdisc_lock_tree(dev);
604 list_add_tail(&qdisc->list, &dev->qdisc_list);
605 dev->qdisc_sleeping = qdisc;
606 qdisc_unlock_tree(dev);
610 int ieee80211_qdisc_installed(struct net_device *dev)
612 return dev->qdisc_sleeping->ops == &wme_qdisc_ops;
616 int ieee80211_wme_register(void)
618 return register_qdisc(&wme_qdisc_ops);
622 void ieee80211_wme_unregister(void)
624 unregister_qdisc(&wme_qdisc_ops);
627 int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
628 struct sta_info *sta, u16 tid)
631 struct ieee80211_sched_data *q =
632 qdisc_priv(local->mdev->qdisc_sleeping);
633 DECLARE_MAC_BUF(mac);
635 /* prepare the filter and save it for the SW queue
636 * matching the received HW queue */
638 if (!local->hw.ampdu_queues)
641 /* try to get a Qdisc from the pool */
642 for (i = local->hw.queues; i < QD_NUM(&local->hw); i++)
643 if (!test_and_set_bit(i, q->qdisc_pool)) {
644 ieee80211_stop_queue(local_to_hw(local), i);
645 sta->tid_to_tx_q[tid] = i;
647 /* IF there are already pending packets
648 * on this tid first we need to drain them
649 * on the previous queue
650 * since HT is strict in order */
651 #ifdef CONFIG_MAC80211_HT_DEBUG
653 printk(KERN_DEBUG "allocated aggregation queue"
654 " %d tid %d addr %s pool=0x%lX",
655 i, tid, print_mac(mac, sta->addr),
657 #endif /* CONFIG_MAC80211_HT_DEBUG */
665 * the caller needs to hold local->mdev->queue_lock
667 void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
668 struct sta_info *sta, u16 tid,
671 struct ieee80211_hw *hw = &local->hw;
672 struct ieee80211_sched_data *q =
673 qdisc_priv(local->mdev->qdisc_sleeping);
674 int agg_queue = sta->tid_to_tx_q[tid];
676 /* return the qdisc to the pool */
677 clear_bit(agg_queue, q->qdisc_pool);
678 sta->tid_to_tx_q[tid] = QD_NUM(hw);
681 ieee80211_requeue(local, agg_queue);
683 q->queues[agg_queue]->ops->reset(q->queues[agg_queue]);
686 void ieee80211_requeue(struct ieee80211_local *local, int queue)
688 struct Qdisc *root_qd = local->mdev->qdisc_sleeping;
689 struct ieee80211_sched_data *q = qdisc_priv(root_qd);
690 struct Qdisc *qdisc = q->queues[queue];
691 struct sk_buff *skb = NULL;
694 if (!qdisc || !qdisc->dequeue)
697 printk(KERN_DEBUG "requeue: qlen = %d\n", qdisc->q.qlen);
698 for (len = qdisc->q.qlen; len > 0; len--) {
699 skb = qdisc->dequeue(qdisc);
701 /* packet will be classified again and */
702 /* skb->packet_data->queue will be overridden if needed */
704 wme_qdiscop_enqueue(skb, root_qd);