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/d80211.h>
18 #include "ieee80211_i.h"
21 #define CHILD_QDISC_OPS pfifo_qdisc_ops
23 static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
25 return (fc & 0x8C) == 0x88;
30 ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
32 u8 *data = rx->skb->data;
35 /* does the frame have a qos control field? */
36 if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
37 u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
38 /* frame has qos control */
39 tid = qc[0] & QOS_CONTROL_TID_MASK;
41 if (unlikely((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)) {
42 /* Separate TID for management frames */
43 tid = NUM_RX_DATA_QUEUES - 1;
45 /* no qos control present */
46 tid = 0; /* 802.1d - Best Effort */
49 #ifdef CONFIG_D80211_DEBUG_COUNTERS
50 I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
52 I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
54 #endif /* CONFIG_D80211_DEBUG_COUNTERS */
57 /* Set skb->priority to 1d tag if highest order bit of TID is not set.
58 * For now, set skb->priority to 0 for other cases. */
59 rx->skb->priority = (tid > 7) ? 0 : tid;
66 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
69 u8 *data = rx->skb->data;
70 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
72 if (!WLAN_FC_IS_QOS_DATA(fc))
75 /* remove the qos control field, update frame type and meta-data */
76 memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
77 hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
78 /* change frame type to non QOS */
79 rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
80 hdr->frame_control = cpu_to_le16(fc);
86 /* maximum number of hardware queues we support. */
87 #define TC_80211_MAX_QUEUES 8
89 struct ieee80211_sched_data
91 struct tcf_proto *filter_list;
92 struct Qdisc *queues[TC_80211_MAX_QUEUES];
93 struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
97 /* given a data frame determine the 802.1p/1d tag to use */
98 static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
104 #ifdef CONFIG_NET_SCHED
105 struct ieee80211_sched_data *q = qdisc_priv(qd);
106 struct tcf_result res = { -1, 0 };
108 /* if there is a user set filter list, call out to that */
109 if (q->filter_list) {
110 tc_classify(skb, q->filter_list, &res);
114 #endif /* CONFIG_NET_SCHED */
116 /* skb->priority values from 256->263 are magic values to
117 * directly indicate a specific 802.1d priority.
118 * This is used to allow 802.1d priority to be passed directly in
119 * from VLAN tags, etc. */
120 if (skb->priority >= 256 && skb->priority <= 263)
121 return skb->priority - 256;
123 /* check there is a valid IP header present */
124 offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
125 if (skb->protocol != __constant_htons(ETH_P_IP) ||
126 skb->len < offset + sizeof(*ip))
129 ip = (struct iphdr *) (skb->data + offset);
131 dscp = ip->tos & 0xfc;
153 static inline int wme_downgrade_ac(struct sk_buff *skb)
155 switch (skb->priority) {
158 skb->priority = 5; /* VO -> VI */
162 skb->priority = 3; /* VI -> BE */
166 skb->priority = 2; /* BE -> BK */
174 /* positive return value indicates which queue to use
175 * negative return value indicates to drop the frame */
176 static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
178 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
179 struct ieee80211_tx_packet_data *pkt_data =
180 (struct ieee80211_tx_packet_data *) skb->cb;
181 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
182 unsigned short fc = le16_to_cpu(hdr->frame_control);
184 const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
186 /* see if frame is data or non data frame */
187 if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
188 /* management frames go on AC_VO queue, but are sent
189 * without QoS control fields */
190 return IEEE80211_TX_QUEUE_DATA0;
193 if (unlikely(pkt_data->mgmt_iface)) {
194 /* Data frames from hostapd (mainly, EAPOL) use AC_VO
195 * and they will include QoS control fields if
196 * the target STA is using WME. */
198 return ieee802_1d_to_ac[skb->priority];
201 /* is this a QoS frame? */
202 qos = fc & IEEE80211_STYPE_QOS_DATA;
205 skb->priority = 0; /* required for correct WPA/11i MIC */
206 return ieee802_1d_to_ac[skb->priority];
209 /* use the data classifier to determine what 802.1d tag the
211 skb->priority = classify_1d(skb, qd);
213 /* incase we are a client verify acm is not set for this ac */
214 while (unlikely(local->wmm_acm & BIT(skb->priority))) {
215 if (wme_downgrade_ac(skb)) {
216 /* No AC with lower priority has acm=0,
222 /* look up which queue to use for frames with this 1d tag */
223 return ieee802_1d_to_ac[skb->priority];
227 static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
229 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
230 struct ieee80211_sched_data *q = qdisc_priv(qd);
231 struct ieee80211_tx_packet_data *pkt_data =
232 (struct ieee80211_tx_packet_data *) skb->cb;
233 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
234 unsigned short fc = le16_to_cpu(hdr->frame_control);
238 if (pkt_data->requeue) {
239 skb_queue_tail(&q->requeued[pkt_data->queue], skb);
243 queue = classify80211(skb, qd);
245 /* now we know the 1d priority, fill in the QoS header if there is one
247 if (WLAN_FC_IS_QOS_DATA(fc)) {
248 u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
249 u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
250 if (local->wifi_wme_noack_test)
251 qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
252 QOS_CONTROL_ACK_POLICY_SHIFT;
253 /* qos header is 2 bytes, second reserved */
259 if (unlikely(queue >= local->hw.queues)) {
261 if (net_ratelimit()) {
262 printk(KERN_DEBUG "%s - queue=%d (hw does not "
264 __func__, queue, local->hw.queues - 1);
267 queue = local->hw.queues - 1;
270 if (unlikely(queue < 0)) {
274 pkt_data->queue = (unsigned int) queue;
275 qdisc = q->queues[queue];
276 err = qdisc->enqueue(skb, qdisc);
277 if (err == NET_XMIT_SUCCESS) {
279 qd->bstats.bytes += skb->len;
280 qd->bstats.packets++;
281 return NET_XMIT_SUCCESS;
289 /* TODO: clean up the cases where master_hard_start_xmit
290 * returns non 0 - it shouldn't ever do that. Once done we
291 * can remove this function */
292 static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
294 struct ieee80211_sched_data *q = qdisc_priv(qd);
295 struct ieee80211_tx_packet_data *pkt_data =
296 (struct ieee80211_tx_packet_data *) skb->cb;
300 /* we recorded which queue to use earlier! */
301 qdisc = q->queues[pkt_data->queue];
303 if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
312 static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
314 struct ieee80211_sched_data *q = qdisc_priv(qd);
315 struct net_device *dev = qd->dev;
316 struct ieee80211_local *local = dev->ieee80211_ptr;
317 struct ieee80211_hw *hw = &local->hw;
322 /* check all the h/w queues in numeric/priority order */
323 for (queue = 0; queue < hw->queues; queue++) {
324 /* see if there is room in this hardware queue */
325 if (test_bit(IEEE80211_LINK_STATE_XOFF,
326 &local->state[queue]) ||
327 test_bit(IEEE80211_LINK_STATE_PENDING,
328 &local->state[queue]))
331 /* there is space - try and get a frame */
332 skb = skb_dequeue(&q->requeued[queue]);
336 qdisc = q->queues[queue];
337 skb = qdisc->dequeue(qdisc);
343 /* returning a NULL here when all the h/w queues are full means we
344 * never need to call netif_stop_queue in the driver */
349 static void wme_qdiscop_reset(struct Qdisc* qd)
351 struct ieee80211_sched_data *q = qdisc_priv(qd);
352 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
353 struct ieee80211_hw *hw = &local->hw;
356 /* QUESTION: should we have some hardware flush functionality here? */
358 for (queue = 0; queue < hw->queues; queue++) {
359 skb_queue_purge(&q->requeued[queue]);
360 qdisc_reset(q->queues[queue]);
366 static void wme_qdiscop_destroy(struct Qdisc* qd)
368 struct ieee80211_sched_data *q = qdisc_priv(qd);
369 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
370 struct ieee80211_hw *hw = &local->hw;
371 struct tcf_proto *tp;
374 while ((tp = q->filter_list) != NULL) {
375 q->filter_list = tp->next;
376 tp->ops->destroy(tp);
379 for (queue=0; queue < hw->queues; queue++) {
380 skb_queue_purge(&q->requeued[queue]);
381 qdisc_destroy(q->queues[queue]);
382 q->queues[queue] = &noop_qdisc;
387 /* called whenever parameters are updated on existing qdisc */
388 static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
390 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
392 /* check our options block is the right size */
393 /* copy any options to our local structure */
394 /* Ignore options block for now - always use static mapping
395 struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
397 if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
399 memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
405 /* called during initial creation of qdisc on device */
406 static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
408 struct ieee80211_sched_data *q = qdisc_priv(qd);
409 struct net_device *dev = qd->dev;
410 struct ieee80211_local *local = dev->ieee80211_ptr;
411 int queues = local->hw.queues;
414 /* check this device is an ieee80211 master type device */
415 if (dev->type != ARPHRD_IEEE80211)
418 /* check that there is no qdisc currently attached to device
419 * this ensures that we will be the root qdisc. (I can't find a better
420 * way to test this explicitly) */
421 if (dev->qdisc_sleeping != &noop_qdisc)
424 if (qd->flags & TCQ_F_INGRESS)
427 /* if options were passed in, set them */
429 err = wme_qdiscop_tune(qd, opt);
432 /* create child queues */
433 for (i = 0; i < queues; i++) {
434 skb_queue_head_init(&q->requeued[i]);
435 q->queues[i] = qdisc_create_dflt(qd->dev, &CHILD_QDISC_OPS);
436 if (q->queues[i] == 0) {
437 q->queues[i] = &noop_qdisc;
438 printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
445 static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
447 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
448 unsigned char *p = skb->tail;
449 struct tc_ieee80211_qopt opt;
451 memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
452 RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
456 skb_trim(skb, p - skb->data);*/
461 static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
462 struct Qdisc *new, struct Qdisc **old)
464 struct ieee80211_sched_data *q = qdisc_priv(qd);
465 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
466 struct ieee80211_hw *hw = &local->hw;
467 unsigned long queue = arg - 1;
469 if (queue >= hw->queues)
476 *old = q->queues[queue];
477 q->queues[queue] = new;
485 static struct Qdisc *
486 wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
488 struct ieee80211_sched_data *q = qdisc_priv(qd);
489 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
490 struct ieee80211_hw *hw = &local->hw;
491 unsigned long queue = arg - 1;
493 if (queue >= hw->queues)
496 return q->queues[queue];
500 static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
502 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
503 struct ieee80211_hw *hw = &local->hw;
504 unsigned long queue = TC_H_MIN(classid);
506 if (queue - 1 >= hw->queues)
513 static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
516 return wme_classop_get(qd, classid);
520 static void wme_classop_put(struct Qdisc *q, unsigned long cl)
522 /* printk(KERN_DEBUG "entering %s\n", __func__); */
526 static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
527 struct rtattr **tca, unsigned long *arg)
529 unsigned long cl = *arg;
530 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
531 struct ieee80211_hw *hw = &local->hw;
532 /* printk(KERN_DEBUG "entering %s\n", __func__); */
534 if (cl - 1 > hw->queues)
537 /* TODO: put code to program hardware queue parameters here,
538 * to allow programming from tc command line */
544 /* we don't support deleting hardware queues
545 * when we add WMM-SA support - TSPECs may be deleted here */
546 static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
548 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
549 struct ieee80211_hw *hw = &local->hw;
550 /* printk(KERN_DEBUG "entering %s\n", __func__); */
552 if (cl - 1 > hw->queues)
558 static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
559 struct sk_buff *skb, struct tcmsg *tcm)
561 struct ieee80211_sched_data *q = qdisc_priv(qd);
562 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
563 struct ieee80211_hw *hw = &local->hw;
564 /* printk(KERN_DEBUG "entering %s\n", __func__); */
566 if (cl - 1 > hw->queues)
568 tcm->tcm_handle = TC_H_MIN(cl);
569 tcm->tcm_parent = qd->handle;
570 tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
575 static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
577 struct ieee80211_local *local = qd->dev->ieee80211_ptr;
578 struct ieee80211_hw *hw = &local->hw;
580 /* printk(KERN_DEBUG "entering %s\n", __func__); */
585 for (queue = 0; queue < hw->queues; queue++) {
586 if (arg->count < arg->skip) {
590 /* we should return classids for our internal queues here
591 * as well as the external ones */
592 if (arg->fn(qd, queue+1, arg) < 0) {
601 static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
604 struct ieee80211_sched_data *q = qdisc_priv(qd);
605 /* printk("entering %s\n", __func__); */
610 return &q->filter_list;
614 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
615 * - these are the operations on the classes */
616 static struct Qdisc_class_ops class_ops =
618 .graft = wme_classop_graft,
619 .leaf = wme_classop_leaf,
621 .get = wme_classop_get,
622 .put = wme_classop_put,
623 .change = wme_classop_change,
624 .delete = wme_classop_delete,
625 .walk = wme_classop_walk,
627 .tcf_chain = wme_classop_find_tcf,
628 .bind_tcf = wme_classop_bind,
629 .unbind_tcf = wme_classop_put,
631 .dump = wme_classop_dump_class,
635 /* queueing discipline operations */
636 static struct Qdisc_ops wme_qdisc_ops =
639 .cl_ops = &class_ops,
641 .priv_size = sizeof(struct ieee80211_sched_data),
643 .enqueue = wme_qdiscop_enqueue,
644 .dequeue = wme_qdiscop_dequeue,
645 .requeue = wme_qdiscop_requeue,
646 .drop = NULL, /* drop not needed since we are always the root qdisc */
648 .init = wme_qdiscop_init,
649 .reset = wme_qdiscop_reset,
650 .destroy = wme_qdiscop_destroy,
651 .change = wme_qdiscop_tune,
653 .dump = wme_qdiscop_dump,
657 void ieee80211_install_qdisc(struct net_device *dev)
661 qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops);
663 printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
667 /* same handle as would be allocated by qdisc_alloc_handle() */
668 qdisc->handle = 0x80010000;
670 qdisc_lock_tree(dev);
671 list_add_tail(&qdisc->list, &dev->qdisc_list);
672 dev->qdisc_sleeping = qdisc;
673 qdisc_unlock_tree(dev);
677 int ieee80211_wme_register(void)
681 #ifdef CONFIG_NET_SCHED
682 err = register_qdisc(&wme_qdisc_ops);
688 void ieee80211_wme_unregister(void)
690 #ifdef CONFIG_NET_SCHED
691 unregister_qdisc(&wme_qdisc_ops);