2007-05-05 20:45:53 +02:00
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/*
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* Copyright 2004, Instant802 Networks, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/types.h>
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#include <net/ip.h>
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#include <net/pkt_sched.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "wme.h"
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/* maximum number of hardware queues we support. */
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#define TC_80211_MAX_QUEUES 8
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struct ieee80211_sched_data
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{
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struct tcf_proto *filter_list;
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struct Qdisc *queues[TC_80211_MAX_QUEUES];
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struct sk_buff_head requeued[TC_80211_MAX_QUEUES];
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};
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/* given a data frame determine the 802.1p/1d tag to use */
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static inline unsigned classify_1d(struct sk_buff *skb, struct Qdisc *qd)
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{
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struct iphdr *ip;
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int dscp;
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int offset;
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct tcf_result res = { -1, 0 };
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/* if there is a user set filter list, call out to that */
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if (q->filter_list) {
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tc_classify(skb, q->filter_list, &res);
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if (res.class != -1)
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return res.class;
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}
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/* skb->priority values from 256->263 are magic values to
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* directly indicate a specific 802.1d priority.
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* This is used to allow 802.1d priority to be passed directly in
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* from VLAN tags, etc. */
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if (skb->priority >= 256 && skb->priority <= 263)
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return skb->priority - 256;
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/* check there is a valid IP header present */
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offset = ieee80211_get_hdrlen_from_skb(skb) + 8 /* LLC + proto */;
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2007-12-11 19:54:23 +01:00
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if (skb->protocol != htons(ETH_P_IP) ||
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2007-05-05 20:45:53 +02:00
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skb->len < offset + sizeof(*ip))
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return 0;
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ip = (struct iphdr *) (skb->data + offset);
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dscp = ip->tos & 0xfc;
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if (dscp & 0x1c)
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return 0;
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return dscp >> 5;
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}
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static inline int wme_downgrade_ac(struct sk_buff *skb)
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{
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switch (skb->priority) {
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case 6:
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case 7:
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skb->priority = 5; /* VO -> VI */
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return 0;
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case 4:
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case 5:
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skb->priority = 3; /* VI -> BE */
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return 0;
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case 0:
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case 3:
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skb->priority = 2; /* BE -> BK */
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return 0;
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default:
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return -1;
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}
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}
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/* positive return value indicates which queue to use
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* negative return value indicates to drop the frame */
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static inline int classify80211(struct sk_buff *skb, struct Qdisc *qd)
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{
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struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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unsigned short fc = le16_to_cpu(hdr->frame_control);
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int qos;
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const int ieee802_1d_to_ac[8] = { 2, 3, 3, 2, 1, 1, 0, 0 };
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/* see if frame is data or non data frame */
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if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)) {
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/* management frames go on AC_VO queue, but are sent
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* without QoS control fields */
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return IEEE80211_TX_QUEUE_DATA0;
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}
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2007-09-28 14:02:09 +02:00
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if (0 /* injected */) {
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/* use AC from radiotap */
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2007-05-05 20:45:53 +02:00
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}
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/* is this a QoS frame? */
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qos = fc & IEEE80211_STYPE_QOS_DATA;
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if (!qos) {
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skb->priority = 0; /* required for correct WPA/11i MIC */
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return ieee802_1d_to_ac[skb->priority];
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}
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/* use the data classifier to determine what 802.1d tag the
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2007-08-28 23:01:55 +02:00
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* data frame has */
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2007-05-05 20:45:53 +02:00
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skb->priority = classify_1d(skb, qd);
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2007-08-28 23:01:55 +02:00
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/* in case we are a client verify acm is not set for this ac */
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2007-05-05 20:45:53 +02:00
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while (unlikely(local->wmm_acm & BIT(skb->priority))) {
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if (wme_downgrade_ac(skb)) {
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2007-08-28 23:01:55 +02:00
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/* No AC with lower priority has acm=0, drop packet. */
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2007-05-05 20:45:53 +02:00
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return -1;
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}
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}
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/* look up which queue to use for frames with this 1d tag */
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return ieee802_1d_to_ac[skb->priority];
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}
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static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
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{
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struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct ieee80211_tx_packet_data *pkt_data =
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(struct ieee80211_tx_packet_data *) skb->cb;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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unsigned short fc = le16_to_cpu(hdr->frame_control);
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struct Qdisc *qdisc;
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int err, queue;
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2007-08-28 23:01:54 +02:00
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if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) {
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2007-05-05 20:45:53 +02:00
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skb_queue_tail(&q->requeued[pkt_data->queue], skb);
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qd->q.qlen++;
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return 0;
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}
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queue = classify80211(skb, qd);
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/* now we know the 1d priority, fill in the QoS header if there is one
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*/
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if (WLAN_FC_IS_QOS_DATA(fc)) {
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u8 *p = skb->data + ieee80211_get_hdrlen(fc) - 2;
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u8 qos_hdr = skb->priority & QOS_CONTROL_TAG1D_MASK;
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if (local->wifi_wme_noack_test)
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qos_hdr |= QOS_CONTROL_ACK_POLICY_NOACK <<
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QOS_CONTROL_ACK_POLICY_SHIFT;
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/* qos header is 2 bytes, second reserved */
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*p = qos_hdr;
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p++;
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*p = 0;
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}
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if (unlikely(queue >= local->hw.queues)) {
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#if 0
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if (net_ratelimit()) {
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printk(KERN_DEBUG "%s - queue=%d (hw does not "
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"support) -> %d\n",
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__func__, queue, local->hw.queues - 1);
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}
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#endif
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queue = local->hw.queues - 1;
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}
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if (unlikely(queue < 0)) {
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kfree_skb(skb);
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err = NET_XMIT_DROP;
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} else {
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pkt_data->queue = (unsigned int) queue;
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qdisc = q->queues[queue];
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err = qdisc->enqueue(skb, qdisc);
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if (err == NET_XMIT_SUCCESS) {
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qd->q.qlen++;
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qd->bstats.bytes += skb->len;
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qd->bstats.packets++;
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return NET_XMIT_SUCCESS;
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}
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}
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qd->qstats.drops++;
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return err;
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}
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/* TODO: clean up the cases where master_hard_start_xmit
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* returns non 0 - it shouldn't ever do that. Once done we
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* can remove this function */
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static int wme_qdiscop_requeue(struct sk_buff *skb, struct Qdisc* qd)
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{
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct ieee80211_tx_packet_data *pkt_data =
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(struct ieee80211_tx_packet_data *) skb->cb;
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struct Qdisc *qdisc;
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int err;
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/* we recorded which queue to use earlier! */
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qdisc = q->queues[pkt_data->queue];
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if ((err = qdisc->ops->requeue(skb, qdisc)) == 0) {
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qd->q.qlen++;
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return 0;
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}
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qd->qstats.drops++;
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return err;
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}
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static struct sk_buff *wme_qdiscop_dequeue(struct Qdisc* qd)
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{
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct net_device *dev = qd->dev;
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hw *hw = &local->hw;
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struct sk_buff *skb;
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struct Qdisc *qdisc;
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int queue;
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/* check all the h/w queues in numeric/priority order */
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for (queue = 0; queue < hw->queues; queue++) {
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/* see if there is room in this hardware queue */
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if (test_bit(IEEE80211_LINK_STATE_XOFF,
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&local->state[queue]) ||
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test_bit(IEEE80211_LINK_STATE_PENDING,
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&local->state[queue]))
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continue;
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/* there is space - try and get a frame */
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skb = skb_dequeue(&q->requeued[queue]);
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if (skb) {
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qd->q.qlen--;
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return skb;
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}
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qdisc = q->queues[queue];
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skb = qdisc->dequeue(qdisc);
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if (skb) {
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qd->q.qlen--;
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return skb;
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}
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}
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/* returning a NULL here when all the h/w queues are full means we
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* never need to call netif_stop_queue in the driver */
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return NULL;
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}
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static void wme_qdiscop_reset(struct Qdisc* qd)
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{
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
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struct ieee80211_hw *hw = &local->hw;
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int queue;
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/* QUESTION: should we have some hardware flush functionality here? */
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for (queue = 0; queue < hw->queues; queue++) {
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skb_queue_purge(&q->requeued[queue]);
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qdisc_reset(q->queues[queue]);
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}
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qd->q.qlen = 0;
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}
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static void wme_qdiscop_destroy(struct Qdisc* qd)
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{
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct ieee80211_local *local = wdev_priv(qd->dev->ieee80211_ptr);
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struct ieee80211_hw *hw = &local->hw;
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int queue;
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tcf_destroy_chain(q->filter_list);
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q->filter_list = NULL;
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for (queue=0; queue < hw->queues; queue++) {
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skb_queue_purge(&q->requeued[queue]);
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qdisc_destroy(q->queues[queue]);
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q->queues[queue] = &noop_qdisc;
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}
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}
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/* called whenever parameters are updated on existing qdisc */
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static int wme_qdiscop_tune(struct Qdisc *qd, struct rtattr *opt)
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{
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/* struct ieee80211_sched_data *q = qdisc_priv(qd);
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*/
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/* check our options block is the right size */
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/* copy any options to our local structure */
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/* Ignore options block for now - always use static mapping
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struct tc_ieee80211_qopt *qopt = RTA_DATA(opt);
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if (opt->rta_len < RTA_LENGTH(sizeof(*qopt)))
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return -EINVAL;
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memcpy(q->tag2queue, qopt->tag2queue, sizeof(qopt->tag2queue));
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*/
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return 0;
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}
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/* called during initial creation of qdisc on device */
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static int wme_qdiscop_init(struct Qdisc *qd, struct rtattr *opt)
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{
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struct ieee80211_sched_data *q = qdisc_priv(qd);
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struct net_device *dev = qd->dev;
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struct ieee80211_local *local;
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int queues;
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int err = 0, i;
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/* check that device is a mac80211 device */
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if (!dev->ieee80211_ptr ||
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dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
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return -EINVAL;
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/* check this device is an ieee80211 master type device */
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if (dev->type != ARPHRD_IEEE80211)
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return -EINVAL;
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/* check that there is no qdisc currently attached to device
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* this ensures that we will be the root qdisc. (I can't find a better
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* way to test this explicitly) */
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if (dev->qdisc_sleeping != &noop_qdisc)
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return -EINVAL;
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if (qd->flags & TCQ_F_INGRESS)
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return -EINVAL;
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local = wdev_priv(dev->ieee80211_ptr);
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queues = local->hw.queues;
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/* if options were passed in, set them */
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if (opt) {
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err = wme_qdiscop_tune(qd, opt);
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}
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/* create child queues */
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for (i = 0; i < queues; i++) {
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skb_queue_head_init(&q->requeued[i]);
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q->queues[i] = qdisc_create_dflt(qd->dev, &pfifo_qdisc_ops,
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qd->handle);
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2007-09-10 13:55:08 +02:00
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if (!q->queues[i]) {
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2007-05-05 20:45:53 +02:00
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q->queues[i] = &noop_qdisc;
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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 */
|
2007-11-14 10:44:41 +01:00
|
|
|
static const struct Qdisc_class_ops class_ops =
|
2007-05-05 20:45:53 +02:00
|
|
|
{
|
|
|
|
.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 */
|
2007-11-14 10:44:41 +01:00
|
|
|
static struct Qdisc_ops wme_qdisc_ops __read_mostly =
|
2007-05-05 20:45:53 +02:00
|
|
|
{
|
|
|
|
.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);
|
|
|
|
}
|