+++ /dev/null
-/*
- * Copyright 2004, Instant802 Networks, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/config.h>
-#include <linux/version.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/module.h>
-#include <net/ip.h>
-
-#include <net/ieee80211.h>
-#include "ieee80211_i.h"
-#include "wme.h"
-
-#define CHILD_QDISC_OPS pfifo_qdisc_ops
-
-static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
-{
- return (fc & 0x8C) == 0x88;
-}
-
-
-ieee80211_txrx_result
-ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
-{
- u8 *data = rx->skb->data;
- int tid;
-
- /* does the frame have a qos control field? */
- if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
- u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
- /* frame has qos control */
- tid = qc[0] & QOS_CONTROL_TID_MASK;
- } else {
- if (unlikely(WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_MGMT)) {
- /* Separate TID for management frames */
- tid = NUM_RX_DATA_QUEUES - 1;
- } else {
- /* no qos control present */
- tid = 0; /* 802.1d - Best Effort */
- }
- }
-#ifdef CONFIG_IEEE80211_DEBUG_COUNTERS
- I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
- if (rx->sta) {
- I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
- }
-#endif /* CONFIG_IEEE80211_DEBUG_COUNTERS */
-
- rx->u.rx.queue = tid;
- /* Set skb->priority to 1d tag if highest order bit of TID is not set.
- * For now, set skb->priority to 0 for other cases. */
- rx->skb->priority = (tid > 7) ? 0 : tid;
-
- return TXRX_CONTINUE;
-}
-
-
-ieee80211_txrx_result
-ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
-{
- u16 fc = rx->fc;
- u8 *data = rx->skb->data;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
-
- if (!WLAN_FC_IS_QOS_DATA(fc))
- return TXRX_CONTINUE;
-
- /* remove the qos control field, update frame type and meta-data */
- memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
- hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
- /* change frame type to non QOS */
- rx->fc = fc &= ~(WLAN_FC_STYPE_QOS_DATA << 4);
- hdr->frame_control = cpu_to_le16(fc);
-
- return TXRX_CONTINUE;
-}
-
-
-/* maximum number of hardware queues we support. */
-#define TC_80211_MAX_QUEUES 8
-
-struct ieee80211_sched_data
-{
- struct tcf_proto *filter_list;
- struct Qdisc *queues[TC_80211_MAX_QUEUES];
- struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
-};
-
-
-/* given a data frame determine the 802.1p/1d tag to use */
-static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
-{
- struct iphdr *ip;
- int dscp;
- int offset;
-
-#ifdef CONFIG_NET_SCHED
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct tcf_result res = { -1, 0 };
-
- /* if there is a user set filter list, call out to that */
- if (q->filter_list) {
- tc_classify(skb, q->filter_list, &res);
- if (res.class != -1)
- return res.class;
- }
-#endif /* CONFIG_NET_SCHED */
-
- /* skb->priority values from 256->263 are magic values to
- * directly indicate a specific 802.1d priority.
- * This is used to allow 802.1d priority to be passed directly in
- * from VLAN tags, etc. */
- if (skb->priority >= 256 && skb->priority <= 263)
- return skb->priority - 256;
-
- /* check there is a valid IP header present */
- offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
- if (skb->protocol != __constant_htons(ETH_P_IP) ||
- skb->len < offset + sizeof(*ip))
- return 0;
-
- ip = (struct iphdr *) (skb->data + offset);
-
- dscp = ip->tos & 0xfc;
- switch (dscp) {
- case 0x20:
- return 2;
- case 0x40:
- return 1;
- case 0x60:
- return 3;
- case 0x80:
- return 4;
- case 0xa0:
- return 5;
- case 0xc0:
- return 6;
- case 0xe0:
- return 7;
- default:
- return 0;
- }
-}
-
-
-
-
-static inline int wme_downgrade_ac(struct sk_buff *skb)
-{
- switch (skb->priority) {
- case 6:
- case 7:
- skb->priority = 5; /* VO -> VI */
- return 0;
- case 4:
- case 5:
- skb->priority = 3; /* VI -> BE */
- return 0;
- case 0:
- case 3:
- skb->priority = 2; /* BE -> BK */
- return 0;
- default:
- return -1;
- }
-}
-
-
-/* positive return value indicates which queue to use
- * negative return value indicates to drop the frame */
-static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
-{
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_tx_packet_data *pkt_data =
- (struct ieee80211_tx_packet_data *) skb->cb;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- unsigned short fc = le16_to_cpu(hdr->frame_control);
- int qos;
- const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
-
- if (unlikely(pkt_data->magic != IEEE80211_CB_MAGIC))
- return -1;
-
- /* see if frame is data or non data frame */
- if (unlikely(WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA)) {
- /* management frames go on AC_VO queue, but are sent
- * without QoS control fields */
- return IEEE80211_TX_QUEUE_DATA0;
- }
-
- if (unlikely(pkt_data->sdata->type == IEEE80211_SUB_IF_TYPE_MGMT)) {
- /* Data frames from hostapd (mainly, EAPOL) use AC_VO
- * and they will include QoS control fields if
- * the target STA is using WME. */
- skb->priority = 7;
- return ieee802_1d_to_ac[skb->priority];
- }
-
-
- /* is this a QoS frame? */
- qos = fc & (WLAN_FC_STYPE_QOS_DATA << 4);
-
-
- if (!qos) {
- skb->priority = 0; /* required for correct WPA/11i MIC */
- return ieee802_1d_to_ac[skb->priority];
- }
-
- /* use the data classifier to determine what 802.1d tag the
- * data frame has */
- skb->priority = classify_1d(skb, qd);
-
-
- /* incase we are a client verify acm is not set for this ac */
- for (; unlikely(local->wmm_acm & BIT(skb->priority)); )
- {
- if (wme_downgrade_ac(skb)) {
- /* No AC with lower priority has acm=0,
- * drop packet. */
- return -1;
- }
- }
-
- /* look up which queue to use for frames with this 1d tag */
- return ieee802_1d_to_ac[skb->priority];
-}
-
-
-static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
-{
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_tx_packet_data *pkt_data =
- (struct ieee80211_tx_packet_data *) skb->cb;
- struct ieee80211_tx_control *control = &pkt_data->control;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- unsigned short fc = le16_to_cpu(hdr->frame_control);
- struct Qdisc *qdisc;
- int err, queue;
-
- if (control->requeue) {
- skb_queue_tail(&q->requeued[control->queue], skb);
- return 0;
- }
-
- queue = classify80211(skb, qd);
-
- /* now we know the 1d priority, fill in the QoS header if there is one */
- if (WLAN_FC_IS_QOS_DATA(fc)) {
- struct qos_control *qc = (struct qos_control *) (skb->data + ieee80211_get_hdrlen(fc) - 2);
- u8 *p = (u8 *) qc;
- *p++ = 0; /* do this due to gcc's lack of optimization on bitfield ops */
- *p = 0;
- qc->tag1d = skb->priority;
- if (local->wifi_wme_noack_test)
- qc->ack_policy = 1;
- }
-
- if (unlikely(queue >= local->hw->queues)) {
-#if 0
- if (net_ratelimit()) {
- printk(KERN_DEBUG "%s - queue=%d (hw does not "
- "support) -> %d\n",
- __func__, queue, local->hw->queues - 1);
- }
-#endif
- queue = local->hw->queues - 1;
- }
-
- if (unlikely(queue < 0)) {
- kfree_skb(skb);
- err = NET_XMIT_DROP;
- } else {
- control->queue = (unsigned int) queue;
- qdisc = q->queues[queue];
- err = qdisc->enqueue(skb, qdisc);
- if (err == NET_XMIT_SUCCESS) {
- qd->q.qlen++;
- qd->bstats.bytes += skb->len;
- qd->bstats.packets++;
- return NET_XMIT_SUCCESS;
- }
- }
- qd->qstats.drops++;
- return err;
-}
-
-
-/* TODO: clean up the cases where master_hard_start_xmit
- * returns non 0 - it shouldn't ever do that. Once done we
- * can remove this function */
-static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_tx_packet_data *pkt_data =
- (struct ieee80211_tx_packet_data *) skb->cb;
- struct Qdisc *qdisc;
- int err;
-
- /* we recorded which queue to use earlier! */
- qdisc = q->queues[pkt_data->control.queue];
-
- if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
- qd->q.qlen++;
- return 0;
- }
- qd->qstats.drops++;
- return err;
-}
-
-
-static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct net_device *dev = qd->dev;
- struct ieee80211_local *local = dev->priv;
- struct ieee80211_hw *hw = local->hw;
- struct ieee80211_tx_queue_stats stats;
- struct sk_buff *skb;
- struct Qdisc *qdisc;
- int queue;
-
- /* find which hardware queues have space in them */
- hw->get_tx_stats(dev, &stats);
-
- /* check all the h/w queues in numeric/priority order */
- for (queue = 0; queue < hw->queues; queue++) {
- /* see if there is room in this hardware queue */
- if (stats.data[queue].len >= stats.data[queue].limit)
- continue;
-
- /* there is space - try and get a frame */
- skb = skb_dequeue(&q->requeued[queue]);
- if (skb)
- return skb;
-
- qdisc = q->queues[queue];
- skb = qdisc->dequeue(qdisc);
- if (skb) {
- qd->q.qlen--;
- return skb;
- }
- }
- /* returning a NULL here when all the h/w queues are full means we
- * never need to call netif_stop_queue in the driver */
- return NULL;
-}
-
-
-static void wme_qdiscop_reset(struct Qdisc* qd)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- int queue;
-
- /* QUESTION: should we have some hardware flush functionality here? */
-
- for (queue = 0; queue < hw->queues; queue++) {
- skb_queue_purge(&q->requeued[queue]);
- qdisc_reset(q->queues[queue]);
- }
- qd->q.qlen = 0;
-}
-
-
-static void wme_qdiscop_destroy(struct Qdisc* qd)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- struct tcf_proto *tp;
- int queue;
-
- while ((tp = q->filter_list) != NULL) {
- q->filter_list = tp->next;
- tp->ops->destroy(tp);
- }
-
- for (queue=0; queue < hw->queues; queue++) {
- skb_queue_purge(&q->requeued[queue]);
- qdisc_destroy(q->queues[queue]);
- q->queues[queue] = &noop_qdisc;
- }
-}
-
-
-/* called whenever parameters are updated on existing qdisc */
-static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
-{
-/* struct ieee80211_sched_data *q = qdisc_priv(qd);
-*/
- /* check our options block is the right size */
- /* copy any options to our local structure */
-/* Ignore options block for now - always use static mapping
- struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
-
- if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
- return -EINVAL;
- memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
-*/
- return 0;
-}
-
-
-/* called during initial creation of qdisc on device */
-static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct net_device *dev = qd->dev;
- struct ieee80211_local *local = dev->priv;
- int queues = local->hw->queues;
- int err = 0, i;
-
- /* check this device is an ieee80211 master type device */
- if (dev->type != ARPHRD_IEEE80211)
- return -EINVAL;
-
- /* check that there is no qdisc currently attached to device
- * this ensures that we will be the root qdisc. (I can't find a better
- * way to test this explicitly) */
- if (dev->qdisc_sleeping != &noop_qdisc)
- return -EINVAL;
-
- if (qd->flags & TCQ_F_INGRESS)
- return -EINVAL;
-
- /* if options were passed in, set them */
- if (opt) {
- err = wme_qdiscop_tune(qd, opt);
- }
-
- /* create child queues */
- for (i = 0; i < queues; i++) {
- skb_queue_head_init(&q->requeued[i]);
- q->queues[i] = qdisc_create_dflt(qd->dev, &CHILD_QDISC_OPS);
- if (q->queues[i] == 0) {
- q->queues[i] = &noop_qdisc;
- printk(KERN_ERR "%s child qdisc %i creation failed", dev->name, i);
- }
- }
-
- return err;
-}
-
-static int wme_qdiscop_dump(struct Qdisc *qd, struct sk_buff *skb)
-{
-/* struct ieee80211_sched_data *q = qdisc_priv(qd);
- unsigned char *p = skb->tail;
- struct tc_ieee80211_qopt opt;
-
- memcpy(&opt.tag2queue, q->tag2queue, TC_80211_MAX_TAG + 1);
- RTA_PUT(skb, TCA_OPTIONS, sizeof(opt), &opt);
-*/ return skb->len;
-/*
-rtattr_failure:
- skb_trim(skb, p - skb->data);*/
- return -1;
-}
-
-
-static int wme_classop_graft(struct Qdisc *qd, unsigned long arg,
- struct Qdisc *new, struct Qdisc **old)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- unsigned long queue = arg - 1;
-
- if (queue >= hw->queues)
- return -EINVAL;
-
- if (new == NULL)
- new = &noop_qdisc;
-
- sch_tree_lock(qd);
- *old = q->queues[queue];
- q->queues[queue] = new;
- qdisc_reset(*old);
- sch_tree_unlock(qd);
-
- return 0;
-}
-
-
-static struct Qdisc *
-wme_classop_leaf(struct Qdisc *qd, unsigned long arg)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- unsigned long queue = arg - 1;
-
- if (queue >= hw->queues)
- return NULL;
-
- return q->queues[queue];
-}
-
-
-static unsigned long wme_classop_get(struct Qdisc *qd, u32 classid)
-{
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- unsigned long queue = TC_H_MIN(classid);
-
- if (queue - 1 >= hw->queues)
- return 0;
-
- return queue;
-}
-
-
-static unsigned long wme_classop_bind(struct Qdisc *qd, unsigned long parent,
- u32 classid)
-{
- return wme_classop_get(qd, classid);
-}
-
-
-static void wme_classop_put(struct Qdisc *q, unsigned long cl)
-{
- /* printk(KERN_DEBUG "entering %s\n", __func__); */
-}
-
-
-static int wme_classop_change(struct Qdisc *qd, u32 handle, u32 parent,
- struct rtattr **tca, unsigned long *arg)
-{
- unsigned long cl = *arg;
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- /* printk(KERN_DEBUG "entering %s\n", __func__); */
-
- if (cl - 1 > hw->queues)
- return -ENOENT;
-
- /* TODO: put code to program hardware queue parameters here,
- * to allow programming from tc command line */
-
- return 0;
-}
-
-
-/* we don't support deleting hardware queues
- * when we add WMM-SA support - TSPECs may be deleted here */
-static int wme_classop_delete(struct Qdisc *qd, unsigned long cl)
-{
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- /* printk(KERN_DEBUG "entering %s\n", __func__); */
-
- if (cl - 1 > hw->queues)
- return -ENOENT;
- return 0;
-}
-
-
-static int wme_classop_dump_class(struct Qdisc *qd, unsigned long cl,
- struct sk_buff *skb, struct tcmsg *tcm)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- /* printk(KERN_DEBUG "entering %s\n", __func__); */
-
- if (cl - 1 > hw->queues)
- return -ENOENT;
- tcm->tcm_handle = TC_H_MIN(cl);
- tcm->tcm_parent = qd->handle;
- tcm->tcm_info = q->queues[cl-1]->handle; /* do we need this? */
- return 0;
-}
-
-
-static void wme_classop_walk(struct Qdisc *qd, struct qdisc_walker *arg)
-{
- struct ieee80211_local *local = qd->dev->priv;
- struct ieee80211_hw *hw = local->hw;
- int queue;
- /* printk(KERN_DEBUG "entering %s\n", __func__); */
-
- if (arg->stop)
- return;
-
- for (queue = 0; queue < hw->queues; queue++) {
- if (arg->count < arg->skip) {
- arg->count++;
- continue;
- }
- /* we should return classids for our internal queues here
- * as well as the external ones */
- if (arg->fn(qd, queue+1, arg) < 0) {
- arg->stop = 1;
- break;
- }
- arg->count++;
- }
-}
-
-
-static struct tcf_proto ** wme_classop_find_tcf(struct Qdisc *qd,
- unsigned long cl)
-{
- struct ieee80211_sched_data *q = qdisc_priv(qd);
- /* printk("entering %s\n", __func__); */
-
- if (cl)
- return NULL;
-
- return &q->filter_list;
-}
-
-
-/* this qdisc is classful (i.e. has classes, some of which may have leaf qdiscs attached)
- * - these are the operations on the classes */
-static struct Qdisc_class_ops class_ops =
-{
- .graft = wme_classop_graft,
- .leaf = wme_classop_leaf,
-
- .get = wme_classop_get,
- .put = wme_classop_put,
- .change = wme_classop_change,
- .delete = wme_classop_delete,
- .walk = wme_classop_walk,
-
- .tcf_chain = wme_classop_find_tcf,
- .bind_tcf = wme_classop_bind,
- .unbind_tcf = wme_classop_put,
-
- .dump = wme_classop_dump_class,
-};
-
-
-/* queueing discipline operations */
-static struct Qdisc_ops wme_qdisc_ops =
-{
- .next = NULL,
- .cl_ops = &class_ops,
- .id = "ieee80211",
- .priv_size = sizeof(struct ieee80211_sched_data),
-
- .enqueue = wme_qdiscop_enqueue,
- .dequeue = wme_qdiscop_dequeue,
- .requeue = wme_qdiscop_requeue,
- .drop = NULL, /* drop not needed since we are always the root qdisc */
-
- .init = wme_qdiscop_init,
- .reset = wme_qdiscop_reset,
- .destroy = wme_qdiscop_destroy,
- .change = wme_qdiscop_tune,
-
- .dump = wme_qdiscop_dump,
-};
-
-
-void ieee80211_install_qdisc(struct net_device *dev)
-{
- struct Qdisc *qdisc;
-
- qdisc = qdisc_create_dflt(dev, &wme_qdisc_ops);
- if (qdisc == NULL) {
- printk(KERN_ERR "%s: qdisc installation failed\n", dev->name);
- return;
- }
-
- /* same handle as would be allocated by qdisc_alloc_handle() */
- qdisc->handle = 0x80010000;
-
- write_lock(&qdisc_tree_lock);
- list_add_tail(&qdisc->list, &dev->qdisc_list);
- dev->qdisc_sleeping = qdisc;
- write_unlock(&qdisc_tree_lock);
-}
-
-
-int ieee80211_wme_register(void)
-{
- int err = 0;
-
-#ifdef CONFIG_NET_SCHED
- err = register_qdisc(&wme_qdisc_ops);
-#endif
- return err;
-}
-
-
-void ieee80211_wme_unregister(void)
-{
-#ifdef CONFIG_NET_SCHED
- unregister_qdisc(&wme_qdisc_ops);
-#endif
-}
projects / openwrt / staging / dedeckeh.git / blobdiff