mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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add devicescape 802.11 stack
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2791 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
700
target/linux/package/ieee80211-dscape/src/wme.c
Normal file
700
target/linux/package/ieee80211-dscape/src/wme.c
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@@ -0,0 +1,700 @@
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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/config.h>
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#include <linux/version.h>
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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 <net/ip.h>
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#include <net/ieee80211.h>
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#include "ieee80211_i.h"
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#include "wme.h"
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#define CHILD_QDISC_OPS pfifo_qdisc_ops
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static inline int WLAN_FC_IS_QOS_DATA(u16 fc)
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{
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return (fc & 0x8C) == 0x88;
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}
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ieee80211_txrx_result
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ieee80211_rx_h_parse_qos(struct ieee80211_txrx_data *rx)
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{
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u8 *data = rx->skb->data;
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int tid;
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/* does the frame have a qos control field? */
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if (WLAN_FC_IS_QOS_DATA(rx->fc)) {
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u8 *qc = data + ieee80211_get_hdrlen(rx->fc) - QOS_CONTROL_LEN;
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/* frame has qos control */
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tid = qc[0] & QOS_CONTROL_TID_MASK;
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} else {
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if (unlikely(WLAN_FC_GET_TYPE(rx->fc) == WLAN_FC_TYPE_MGMT)) {
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/* Separate TID for management frames */
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tid = NUM_RX_DATA_QUEUES - 1;
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} else {
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/* no qos control present */
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tid = 0; /* 802.1d - Best Effort */
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}
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}
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#ifdef CONFIG_IEEE80211_DEBUG_COUNTERS
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I802_DEBUG_INC(rx->local->wme_rx_queue[tid]);
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if (rx->sta) {
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I802_DEBUG_INC(rx->sta->wme_rx_queue[tid]);
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}
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#endif /* CONFIG_IEEE80211_DEBUG_COUNTERS */
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rx->u.rx.queue = tid;
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/* Set skb->priority to 1d tag if highest order bit of TID is not set.
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* For now, set skb->priority to 0 for other cases. */
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rx->skb->priority = (tid > 7) ? 0 : tid;
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return TXRX_CONTINUE;
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}
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ieee80211_txrx_result
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ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
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{
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u16 fc = rx->fc;
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u8 *data = rx->skb->data;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
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if (!WLAN_FC_IS_QOS_DATA(fc))
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return TXRX_CONTINUE;
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/* remove the qos control field, update frame type and meta-data */
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memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
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hdr = (struct ieee80211_hdr *) skb_pull(rx->skb, 2);
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/* change frame type to non QOS */
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rx->fc = fc &= ~(WLAN_FC_STYPE_QOS_DATA << 4);
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hdr->frame_control = cpu_to_le16(fc);
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return TXRX_CONTINUE;
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}
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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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#ifdef CONFIG_NET_SCHED
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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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#endif /* CONFIG_NET_SCHED */
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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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if (skb->protocol != __constant_htons(ETH_P_IP) ||
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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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switch (dscp) {
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case 0x20:
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return 2;
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case 0x40:
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return 1;
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case 0x60:
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return 3;
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case 0x80:
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return 4;
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case 0xa0:
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return 5;
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case 0xc0:
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return 6;
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case 0xe0:
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return 7;
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default:
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return 0;
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}
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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 = qd->dev->priv;
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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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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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if (unlikely(pkt_data->magic != IEEE80211_CB_MAGIC))
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return -1;
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/* see if frame is data or non data frame */
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if (unlikely(WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_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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if (unlikely(pkt_data->sdata->type == IEEE80211_SUB_IF_TYPE_MGMT)) {
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/* Data frames from hostapd (mainly, EAPOL) use AC_VO
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* and they will include QoS control fields if
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* the target STA is using WME. */
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skb->priority = 7;
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return ieee802_1d_to_ac[skb->priority];
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}
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/* is this a QoS frame? */
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qos = fc & (WLAN_FC_STYPE_QOS_DATA << 4);
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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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* data frame has */
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skb->priority = classify_1d(skb, qd);
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/* incase we are a client verify acm is not set for this ac */
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for (; unlikely(local->wmm_acm & BIT(skb->priority)); )
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{
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if (wme_downgrade_ac(skb)) {
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/* No AC with lower priority has acm=0,
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* drop packet. */
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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 = qd->dev->priv;
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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_tx_control *control = &pkt_data->control;
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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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if (control->requeue) {
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skb_queue_tail(&q->requeued[control->queue], skb);
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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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if (WLAN_FC_IS_QOS_DATA(fc)) {
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struct qos_control *qc = (struct qos_control *) (skb->data + ieee80211_get_hdrlen(fc) - 2);
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u8 *p = (u8 *) qc;
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*p++ = 0; /* do this due to gcc's lack of optimization on bitfield ops */
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*p = 0;
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qc->tag1d = skb->priority;
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if (local->wifi_wme_noack_test)
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qc->ack_policy = 1;
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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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control->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->control.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 = dev->priv;
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struct ieee80211_hw *hw = local->hw;
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struct ieee80211_tx_queue_stats stats;
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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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/* find which hardware queues have space in them */
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hw->get_tx_stats(dev, &stats);
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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 (stats.data[queue].len >= stats.data[queue].limit)
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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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return skb;
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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 = qd->dev->priv;
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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 = qd->dev->priv;
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struct ieee80211_hw *hw = local->hw;
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struct tcf_proto *tp;
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int queue;
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while ((tp = q->filter_list) != NULL) {
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q->filter_list = tp->next;
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tp->ops->destroy(tp);
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}
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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 = dev->priv;
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int queues = local->hw->queues;
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int err = 0, i;
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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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/* 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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||||
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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, &CHILD_QDISC_OPS);
|
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if (q->queues[i] == 0) {
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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);
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}
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}
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return err;
|
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}
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||||
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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
|
||||
}
|
||||
Reference in New Issue
Block a user