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 TC_80211_MAX_QUEUES 16
24 const int ieee802_1d_to_ac
[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
26 struct ieee80211_sched_data
28 unsigned long qdisc_pool
;
29 struct tcf_proto
*filter_list
;
30 struct Qdisc
*queues
[TC_80211_MAX_QUEUES
];
31 struct sk_buff_head requeued
[TC_80211_MAX_QUEUES
];
34 static const char llc_ip_hdr
[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
36 /* given a data frame determine the 802.1p/1d tag to use */
37 static inline unsigned classify_1d(struct sk_buff
*skb
, struct Qdisc
*qd
)
43 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
44 struct tcf_result res
= { -1, 0 };
46 /* if there is a user set filter list, call out to that */
48 tc_classify(skb
, q
->filter_list
, &res
);
53 /* skb->priority values from 256->263 are magic values to
54 * directly indicate a specific 802.1d priority.
55 * This is used to allow 802.1d priority to be passed directly in
56 * from VLAN tags, etc. */
57 if (skb
->priority
>= 256 && skb
->priority
<= 263)
58 return skb
->priority
- 256;
60 /* check there is a valid IP header present */
61 offset
= ieee80211_get_hdrlen_from_skb(skb
);
62 if (skb
->len
< offset
+ sizeof(llc_ip_hdr
) + sizeof(*ip
) ||
63 memcmp(skb
->data
+ offset
, llc_ip_hdr
, sizeof(llc_ip_hdr
)))
66 ip
= (struct iphdr
*) (skb
->data
+ offset
+ sizeof(llc_ip_hdr
));
68 dscp
= ip
->tos
& 0xfc;
75 static inline int wme_downgrade_ac(struct sk_buff
*skb
)
77 switch (skb
->priority
) {
80 skb
->priority
= 5; /* VO -> VI */
84 skb
->priority
= 3; /* VI -> BE */
88 skb
->priority
= 2; /* BE -> BK */
96 /* positive return value indicates which queue to use
97 * negative return value indicates to drop the frame */
98 static inline int classify80211(struct sk_buff
*skb
, struct Qdisc
*qd
)
100 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
101 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
102 unsigned short fc
= le16_to_cpu(hdr
->frame_control
);
105 /* see if frame is data or non data frame */
106 if (unlikely((fc
& IEEE80211_FCTL_FTYPE
) != IEEE80211_FTYPE_DATA
)) {
107 /* management frames go on AC_VO queue, but are sent
108 * without QoS control fields */
109 return IEEE80211_TX_QUEUE_DATA0
;
112 if (0 /* injected */) {
113 /* use AC from radiotap */
116 /* is this a QoS frame? */
117 qos
= fc
& IEEE80211_STYPE_QOS_DATA
;
120 skb
->priority
= 0; /* required for correct WPA/11i MIC */
121 return ieee802_1d_to_ac
[skb
->priority
];
124 /* use the data classifier to determine what 802.1d tag the
126 skb
->priority
= classify_1d(skb
, qd
);
128 /* in case we are a client verify acm is not set for this ac */
129 while (unlikely(local
->wmm_acm
& BIT(skb
->priority
))) {
130 if (wme_downgrade_ac(skb
)) {
131 /* No AC with lower priority has acm=0, drop packet. */
136 /* look up which queue to use for frames with this 1d tag */
137 return ieee802_1d_to_ac
[skb
->priority
];
141 static int wme_qdiscop_enqueue(struct sk_buff
*skb
, struct Qdisc
* qd
)
143 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
144 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
145 struct ieee80211_tx_packet_data
*pkt_data
=
146 (struct ieee80211_tx_packet_data
*) skb
->cb
;
147 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*) skb
->data
;
148 unsigned short fc
= le16_to_cpu(hdr
->frame_control
);
151 struct sta_info
*sta
;
154 if (pkt_data
->flags
& IEEE80211_TXPD_REQUEUE
) {
155 queue
= pkt_data
->queue
;
156 sta
= sta_info_get(local
, hdr
->addr1
);
157 tid
= skb
->priority
& QOS_CONTROL_TAG1D_MASK
;
159 int ampdu_queue
= sta
->tid_to_tx_q
[tid
];
160 if ((ampdu_queue
< local
->hw
.queues
) &&
161 test_bit(ampdu_queue
, &q
->qdisc_pool
)) {
163 pkt_data
->flags
|= IEEE80211_TXPD_AMPDU
;
165 pkt_data
->flags
&= ~IEEE80211_TXPD_AMPDU
;
169 skb_queue_tail(&q
->requeued
[queue
], skb
);
174 queue
= classify80211(skb
, qd
);
176 /* now we know the 1d priority, fill in the QoS header if there is one
178 if (WLAN_FC_IS_QOS_DATA(fc
)) {
179 u8
*p
= skb
->data
+ ieee80211_get_hdrlen(fc
) - 2;
181 tid
= skb
->priority
& QOS_CONTROL_TAG1D_MASK
;
182 if (local
->wifi_wme_noack_test
)
183 ack_policy
|= QOS_CONTROL_ACK_POLICY_NOACK
<<
184 QOS_CONTROL_ACK_POLICY_SHIFT
;
185 /* qos header is 2 bytes, second reserved */
186 *p
= ack_policy
| tid
;
190 sta
= sta_info_get(local
, hdr
->addr1
);
192 int ampdu_queue
= sta
->tid_to_tx_q
[tid
];
193 if ((ampdu_queue
< local
->hw
.queues
) &&
194 test_bit(ampdu_queue
, &q
->qdisc_pool
)) {
196 pkt_data
->flags
|= IEEE80211_TXPD_AMPDU
;
198 pkt_data
->flags
&= ~IEEE80211_TXPD_AMPDU
;
204 if (unlikely(queue
>= local
->hw
.queues
)) {
206 if (net_ratelimit()) {
207 printk(KERN_DEBUG
"%s - queue=%d (hw does not "
209 __func__
, queue
, local
->hw
.queues
- 1);
212 queue
= local
->hw
.queues
- 1;
215 if (unlikely(queue
< 0)) {
219 tid
= skb
->priority
& QOS_CONTROL_TAG1D_MASK
;
220 pkt_data
->queue
= (unsigned int) queue
;
221 qdisc
= q
->queues
[queue
];
222 err
= qdisc
->enqueue(skb
, qdisc
);
223 if (err
== NET_XMIT_SUCCESS
) {
225 qd
->bstats
.bytes
+= skb
->len
;
226 qd
->bstats
.packets
++;
227 return NET_XMIT_SUCCESS
;
235 /* TODO: clean up the cases where master_hard_start_xmit
236 * returns non 0 - it shouldn't ever do that. Once done we
237 * can remove this function */
238 static int wme_qdiscop_requeue(struct sk_buff
*skb
, struct Qdisc
* qd
)
240 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
241 struct ieee80211_tx_packet_data
*pkt_data
=
242 (struct ieee80211_tx_packet_data
*) skb
->cb
;
246 /* we recorded which queue to use earlier! */
247 qdisc
= q
->queues
[pkt_data
->queue
];
249 if ((err
= qdisc
->ops
->requeue(skb
, qdisc
)) == 0) {
258 static struct sk_buff
*wme_qdiscop_dequeue(struct Qdisc
* qd
)
260 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
261 struct net_device
*dev
= qd
->dev
;
262 struct ieee80211_local
*local
= wdev_priv(dev
->ieee80211_ptr
);
263 struct ieee80211_hw
*hw
= &local
->hw
;
268 /* check all the h/w queues in numeric/priority order */
269 for (queue
= 0; queue
< hw
->queues
; queue
++) {
270 /* see if there is room in this hardware queue */
271 if ((test_bit(IEEE80211_LINK_STATE_XOFF
,
272 &local
->state
[queue
])) ||
273 (test_bit(IEEE80211_LINK_STATE_PENDING
,
274 &local
->state
[queue
])) ||
275 (!test_bit(queue
, &q
->qdisc_pool
)))
278 /* there is space - try and get a frame */
279 skb
= skb_dequeue(&q
->requeued
[queue
]);
285 qdisc
= q
->queues
[queue
];
286 skb
= qdisc
->dequeue(qdisc
);
292 /* returning a NULL here when all the h/w queues are full means we
293 * never need to call netif_stop_queue in the driver */
298 static void wme_qdiscop_reset(struct Qdisc
* qd
)
300 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
301 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
302 struct ieee80211_hw
*hw
= &local
->hw
;
305 /* QUESTION: should we have some hardware flush functionality here? */
307 for (queue
= 0; queue
< hw
->queues
; queue
++) {
308 skb_queue_purge(&q
->requeued
[queue
]);
309 qdisc_reset(q
->queues
[queue
]);
315 static void wme_qdiscop_destroy(struct Qdisc
* qd
)
317 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
318 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
319 struct ieee80211_hw
*hw
= &local
->hw
;
322 tcf_destroy_chain(q
->filter_list
);
323 q
->filter_list
= NULL
;
325 for (queue
=0; queue
< hw
->queues
; queue
++) {
326 skb_queue_purge(&q
->requeued
[queue
]);
327 qdisc_destroy(q
->queues
[queue
]);
328 q
->queues
[queue
] = &noop_qdisc
;
333 /* called whenever parameters are updated on existing qdisc */
334 static int wme_qdiscop_tune(struct Qdisc
*qd
, struct rtattr
*opt
)
336 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
338 /* check our options block is the right size */
339 /* copy any options to our local structure */
340 /* Ignore options block for now - always use static mapping
341 struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
343 if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
345 memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
351 /* called during initial creation of qdisc on device */
352 static int wme_qdiscop_init(struct Qdisc
*qd
, struct rtattr
*opt
)
354 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
355 struct net_device
*dev
= qd
->dev
;
356 struct ieee80211_local
*local
;
360 /* check that device is a mac80211 device */
361 if (!dev
->ieee80211_ptr
||
362 dev
->ieee80211_ptr
->wiphy
->privid
!= mac80211_wiphy_privid
)
365 /* check this device is an ieee80211 master type device */
366 if (dev
->type
!= ARPHRD_IEEE80211
)
369 /* check that there is no qdisc currently attached to device
370 * this ensures that we will be the root qdisc. (I can't find a better
371 * way to test this explicitly) */
372 if (dev
->qdisc_sleeping
!= &noop_qdisc
)
375 if (qd
->flags
& TCQ_F_INGRESS
)
378 local
= wdev_priv(dev
->ieee80211_ptr
);
379 queues
= local
->hw
.queues
;
381 /* if options were passed in, set them */
383 err
= wme_qdiscop_tune(qd
, opt
);
386 /* create child queues */
387 for (i
= 0; i
< queues
; i
++) {
388 skb_queue_head_init(&q
->requeued
[i
]);
389 q
->queues
[i
] = qdisc_create_dflt(qd
->dev
, &pfifo_qdisc_ops
,
392 q
->queues
[i
] = &noop_qdisc
;
393 printk(KERN_ERR
"%s child qdisc %i creation failed", dev
->name
, i
);
397 /* reserve all legacy QoS queues */
398 for (i
= 0; i
< min(IEEE80211_TX_QUEUE_DATA4
, queues
); i
++)
399 set_bit(i
, &q
->qdisc_pool
);
404 static int wme_qdiscop_dump(struct Qdisc
*qd
, struct sk_buff
*skb
)
406 /* struct ieee80211_sched_data *q = qdisc_priv(qd);
407 unsigned char *p = skb->tail;
408 struct tc_ieee80211_qopt opt;
410 memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
411 RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
415 skb_trim(skb, p - skb->data);*/
420 static int wme_classop_graft(struct Qdisc
*qd
, unsigned long arg
,
421 struct Qdisc
*new, struct Qdisc
**old
)
423 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
424 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
425 struct ieee80211_hw
*hw
= &local
->hw
;
426 unsigned long queue
= arg
- 1;
428 if (queue
>= hw
->queues
)
435 *old
= q
->queues
[queue
];
436 q
->queues
[queue
] = new;
444 static struct Qdisc
*
445 wme_classop_leaf(struct Qdisc
*qd
, unsigned long arg
)
447 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
448 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
449 struct ieee80211_hw
*hw
= &local
->hw
;
450 unsigned long queue
= arg
- 1;
452 if (queue
>= hw
->queues
)
455 return q
->queues
[queue
];
459 static unsigned long wme_classop_get(struct Qdisc
*qd
, u32 classid
)
461 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
462 struct ieee80211_hw
*hw
= &local
->hw
;
463 unsigned long queue
= TC_H_MIN(classid
);
465 if (queue
- 1 >= hw
->queues
)
472 static unsigned long wme_classop_bind(struct Qdisc
*qd
, unsigned long parent
,
475 return wme_classop_get(qd
, classid
);
479 static void wme_classop_put(struct Qdisc
*q
, unsigned long cl
)
484 static int wme_classop_change(struct Qdisc
*qd
, u32 handle
, u32 parent
,
485 struct rtattr
**tca
, unsigned long *arg
)
487 unsigned long cl
= *arg
;
488 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
489 struct ieee80211_hw
*hw
= &local
->hw
;
491 if (cl
- 1 > hw
->queues
)
494 /* TODO: put code to program hardware queue parameters here,
495 * to allow programming from tc command line */
501 /* we don't support deleting hardware queues
502 * when we add WMM-SA support - TSPECs may be deleted here */
503 static int wme_classop_delete(struct Qdisc
*qd
, unsigned long cl
)
505 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
506 struct ieee80211_hw
*hw
= &local
->hw
;
508 if (cl
- 1 > hw
->queues
)
514 static int wme_classop_dump_class(struct Qdisc
*qd
, unsigned long cl
,
515 struct sk_buff
*skb
, struct tcmsg
*tcm
)
517 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
518 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
519 struct ieee80211_hw
*hw
= &local
->hw
;
521 if (cl
- 1 > hw
->queues
)
523 tcm
->tcm_handle
= TC_H_MIN(cl
);
524 tcm
->tcm_parent
= qd
->handle
;
525 tcm
->tcm_info
= q
->queues
[cl
-1]->handle
; /* do we need this? */
530 static void wme_classop_walk(struct Qdisc
*qd
, struct qdisc_walker
*arg
)
532 struct ieee80211_local
*local
= wdev_priv(qd
->dev
->ieee80211_ptr
);
533 struct ieee80211_hw
*hw
= &local
->hw
;
539 for (queue
= 0; queue
< hw
->queues
; queue
++) {
540 if (arg
->count
< arg
->skip
) {
544 /* we should return classids for our internal queues here
545 * as well as the external ones */
546 if (arg
->fn(qd
, queue
+1, arg
) < 0) {
555 static struct tcf_proto
** wme_classop_find_tcf(struct Qdisc
*qd
,
558 struct ieee80211_sched_data
*q
= qdisc_priv(qd
);
563 return &q
->filter_list
;
567 /* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
568 * - these are the operations on the classes */
569 static struct Qdisc_class_ops class_ops
=
571 .graft
= wme_classop_graft
,
572 .leaf
= wme_classop_leaf
,
574 .get
= wme_classop_get
,
575 .put
= wme_classop_put
,
576 .change
= wme_classop_change
,
577 .delete = wme_classop_delete
,
578 .walk
= wme_classop_walk
,
580 .tcf_chain
= wme_classop_find_tcf
,
581 .bind_tcf
= wme_classop_bind
,
582 .unbind_tcf
= wme_classop_put
,
584 .dump
= wme_classop_dump_class
,
588 /* queueing discipline operations */
589 static struct Qdisc_ops wme_qdisc_ops
=
592 .cl_ops
= &class_ops
,
594 .priv_size
= sizeof(struct ieee80211_sched_data
),
596 .enqueue
= wme_qdiscop_enqueue
,
597 .dequeue
= wme_qdiscop_dequeue
,
598 .requeue
= wme_qdiscop_requeue
,
599 .drop
= NULL
, /* drop not needed since we are always the root qdisc */
601 .init
= wme_qdiscop_init
,
602 .reset
= wme_qdiscop_reset
,
603 .destroy
= wme_qdiscop_destroy
,
604 .change
= wme_qdiscop_tune
,
606 .dump
= wme_qdiscop_dump
,
610 void ieee80211_install_qdisc(struct net_device
*dev
)
614 qdisc
= qdisc_create_dflt(dev
, &wme_qdisc_ops
, TC_H_ROOT
);
616 printk(KERN_ERR
"%s: qdisc installation failed\n", dev
->name
);
620 /* same handle as would be allocated by qdisc_alloc_handle() */
621 qdisc
->handle
= 0x80010000;
623 qdisc_lock_tree(dev
);
624 list_add_tail(&qdisc
->list
, &dev
->qdisc_list
);
625 dev
->qdisc_sleeping
= qdisc
;
626 qdisc_unlock_tree(dev
);
630 int ieee80211_qdisc_installed(struct net_device
*dev
)
632 return dev
->qdisc_sleeping
->ops
== &wme_qdisc_ops
;
636 int ieee80211_wme_register(void)
638 return register_qdisc(&wme_qdisc_ops
);
642 void ieee80211_wme_unregister(void)
644 unregister_qdisc(&wme_qdisc_ops
);
647 int ieee80211_ht_agg_queue_add(struct ieee80211_local
*local
,
648 struct sta_info
*sta
, u16 tid
)
651 struct ieee80211_sched_data
*q
=
652 qdisc_priv(local
->mdev
->qdisc_sleeping
);
653 DECLARE_MAC_BUF(mac
);
655 /* prepare the filter and save it for the SW queue
656 * matching the recieved HW queue */
658 /* try to get a Qdisc from the pool */
659 for (i
= IEEE80211_TX_QUEUE_BEACON
; i
< local
->hw
.queues
; i
++)
660 if (!test_and_set_bit(i
, &q
->qdisc_pool
)) {
661 ieee80211_stop_queue(local_to_hw(local
), i
);
662 sta
->tid_to_tx_q
[tid
] = i
;
664 /* IF there are already pending packets
665 * on this tid first we need to drain them
666 * on the previous queue
667 * since HT is strict in order */
668 #ifdef CONFIG_MAC80211_HT_DEBUG
670 printk(KERN_DEBUG
"allocated aggregation queue"
671 " %d tid %d addr %s pool=0x%lX\n",
672 i
, tid
, print_mac(mac
, sta
->addr
),
674 #endif /* CONFIG_MAC80211_HT_DEBUG */
682 * the caller needs to hold local->mdev->queue_lock
684 void ieee80211_ht_agg_queue_remove(struct ieee80211_local
*local
,
685 struct sta_info
*sta
, u16 tid
,
688 struct ieee80211_sched_data
*q
=
689 qdisc_priv(local
->mdev
->qdisc_sleeping
);
690 int agg_queue
= sta
->tid_to_tx_q
[tid
];
692 /* return the qdisc to the pool */
693 clear_bit(agg_queue
, &q
->qdisc_pool
);
694 sta
->tid_to_tx_q
[tid
] = local
->hw
.queues
;
697 ieee80211_requeue(local
, agg_queue
);
699 q
->queues
[agg_queue
]->ops
->reset(q
->queues
[agg_queue
]);
702 void ieee80211_requeue(struct ieee80211_local
*local
, int queue
)
704 struct Qdisc
*root_qd
= local
->mdev
->qdisc_sleeping
;
705 struct ieee80211_sched_data
*q
= qdisc_priv(root_qd
);
706 struct Qdisc
*qdisc
= q
->queues
[queue
];
707 struct sk_buff
*skb
= NULL
;
708 u32 len
= qdisc
->q
.qlen
;
710 if (!qdisc
|| !qdisc
->dequeue
)
713 printk(KERN_DEBUG
"requeue: qlen = %d\n", qdisc
->q
.qlen
);
714 for (len
= qdisc
->q
.qlen
; len
> 0; len
--) {
715 skb
= qdisc
->dequeue(qdisc
);
717 /* packet will be classified again and */
718 /* skb->packet_data->queue will be overridden if needed */
720 wme_qdiscop_enqueue(skb
, root_qd
);