diff options
Diffstat (limited to 'net/mac80211/wme.c')
| -rw-r--r-- | net/mac80211/wme.c | 678 |
1 files changed, 678 insertions, 0 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c new file mode 100644 index 000000000000..89ce81529694 --- /dev/null +++ b/net/mac80211/wme.c @@ -0,0 +1,678 @@ +/* + * 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/netdevice.h> +#include <linux/skbuff.h> +#include <linux/module.h> +#include <linux/if_arp.h> +#include <linux/types.h> +#include <net/ip.h> +#include <net/pkt_sched.h> + +#include <net/mac80211.h> +#include "ieee80211_i.h" +#include "wme.h" + +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((rx->fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_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_MAC80211_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_MAC80211_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 &= ~IEEE80211_STYPE_QOS_DATA; + hdr->frame_control = cpu_to_le16(fc); + + return TXRX_CONTINUE; +} + + +#ifdef CONFIG_NET_SCHED +/* 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; + + 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; + } + + /* 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; + if (dscp & 0x1c) + return 0; + return dscp >> 5; +} + + +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 = wdev_priv(qd->dev->ieee80211_ptr); + 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 }; + + /* see if frame is data or non data frame */ + if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) { + /* management frames go on AC_VO queue, but are sent + * without QoS control fields */ + return IEEE80211_TX_QUEUE_DATA0; + } + + if (unlikely(pkt_data->mgmt_iface)) { + /* 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 & IEEE80211_STYPE_QOS_DATA; + + 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 */ + while (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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_sched_data *q = qdisc_priv(qd); + 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); + struct Qdisc *qdisc; + int err, queue; + + if (pkt_data->requeue) { + skb_queue_tail(&q->requeued[pkt_data->queue], skb); + qd->q.qlen++; + 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)) { + u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2; + u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK; + if (local->wifi_wme_noack_test) + qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK << + QOS_CONTROL_ACK_POLICY_SHIFT; + /* qos header is 2 bytes, second reserved */ + *p = qos_hdr; + p++; + *p = 0; + } + + 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 { + pkt_data->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->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 = wdev_priv(dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + struct sk_buff *skb; + struct Qdisc *qdisc; + int queue; + + /* 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 (test_bit(IEEE80211_LINK_STATE_XOFF, + &local->state[queue]) || + test_bit(IEEE80211_LINK_STATE_PENDING, + &local->state[queue])) + continue; + + /* there is space - try and get a frame */ + skb = skb_dequeue(&q->requeued[queue]); + if (skb) { + qd->q.qlen--; + 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 = wdev_priv(qd->dev->ieee80211_ptr); + 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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + int queue; + + tcf_destroy_chain(q->filter_list); + q->filter_list = NULL; + + 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; + int queues; + int err = 0, i; + + /* check that device is a mac80211 device */ + if (!dev->ieee80211_ptr || + dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid) + return -EINVAL; + + /* 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; + + local = wdev_priv(dev->ieee80211_ptr); + queues = local->hw.queues; + + /* 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, &pfifo_qdisc_ops, + qd->handle); + 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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + unsigned long queue = arg - 1; + + if (queue >= hw->queues) + return -EINVAL; + + if (!new) + 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 = wdev_priv(qd->dev->ieee80211_ptr); + 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 = wdev_priv(qd->dev->ieee80211_ptr); + 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) +{ +} + + +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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + + 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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + + 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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + + 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 = wdev_priv(qd->dev->ieee80211_ptr); + struct ieee80211_hw *hw = &local->hw; + int queue; + + 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); + + 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, TC_H_ROOT); + if (!qdisc) { + printk(KERN_ERR "%s: qdisc installation failed\n", dev->name); + return; + } + + /* same handle as would be allocated by qdisc_alloc_handle() */ + qdisc->handle = 0x80010000; + + qdisc_lock_tree(dev); + list_add_tail(&qdisc->list, &dev->qdisc_list); + dev->qdisc_sleeping = qdisc; + qdisc_unlock_tree(dev); +} + + +int ieee80211_qdisc_installed(struct net_device *dev) +{ + return dev->qdisc_sleeping->ops == &wme_qdisc_ops; +} + + +int ieee80211_wme_register(void) +{ + return register_qdisc(&wme_qdisc_ops); +} + + +void ieee80211_wme_unregister(void) +{ + unregister_qdisc(&wme_qdisc_ops); +} +#endif /* CONFIG_NET_SCHED */ |
