2 * Copyright 2004, Instant802 Networks, Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
9 #include <linux/netdevice.h>
10 #include <linux/skbuff.h>
11 #include <linux/module.h>
12 #include <linux/if_arp.h>
13 #include <linux/types.h>
15 #include <net/pkt_sched.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
21 /* Default mapping in classifier to work with default
24 const int ieee802_1d_to_ac[8] = {
35 static int wme_downgrade_ac(struct sk_buff *skb)
37 switch (skb->priority) {
40 skb->priority = 5; /* VO -> VI */
44 skb->priority = 3; /* VI -> BE */
48 skb->priority = 2; /* BE -> BK */
55 static u16 ieee80211_downgrade_queue(struct ieee80211_local *local,
58 /* in case we are a client verify acm is not set for this ac */
59 while (unlikely(local->wmm_acm & BIT(skb->priority))) {
60 if (wme_downgrade_ac(skb)) {
62 * This should not really happen. The AP has marked all
63 * lower ACs to require admission control which is not
64 * a reasonable configuration. Allow the frame to be
65 * transmitted using AC_BK as a workaround.
71 /* look up which queue to use for frames with this 1d tag */
72 return ieee802_1d_to_ac[skb->priority];
75 /* Indicate which queue to use for this fully formed 802.11 frame */
76 u16 ieee80211_select_queue_80211(struct ieee80211_local *local,
78 struct ieee80211_hdr *hdr)
82 if (local->hw.queues < IEEE80211_NUM_ACS)
85 if (!ieee80211_is_data(hdr->frame_control)) {
87 return ieee802_1d_to_ac[skb->priority];
89 if (!ieee80211_is_data_qos(hdr->frame_control)) {
91 return ieee802_1d_to_ac[skb->priority];
94 p = ieee80211_get_qos_ctl(hdr);
95 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
97 return ieee80211_downgrade_queue(local, skb);
100 /* Indicate which queue to use. */
101 u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
104 struct ieee80211_local *local = sdata->local;
105 struct sta_info *sta = NULL;
109 if (local->hw.queues < IEEE80211_NUM_ACS || skb->len < 6) {
110 skb->priority = 0; /* required for correct WPA/11i MIC */
115 switch (sdata->vif.type) {
116 case NL80211_IFTYPE_AP_VLAN:
117 sta = rcu_dereference(sdata->u.vlan.sta);
119 qos = test_sta_flag(sta, WLAN_STA_WME);
122 case NL80211_IFTYPE_AP:
125 case NL80211_IFTYPE_WDS:
126 ra = sdata->u.wds.remote_addr;
128 #ifdef CONFIG_MAC80211_MESH
129 case NL80211_IFTYPE_MESH_POINT:
133 case NL80211_IFTYPE_STATION:
134 ra = sdata->u.mgd.bssid;
136 case NL80211_IFTYPE_ADHOC:
143 if (!sta && ra && !is_multicast_ether_addr(ra)) {
144 sta = sta_info_get(sdata, ra);
146 qos = test_sta_flag(sta, WLAN_STA_WME);
151 skb->priority = 0; /* required for correct WPA/11i MIC */
152 return IEEE80211_AC_BE;
155 /* use the data classifier to determine what 802.1d tag the
157 skb->priority = cfg80211_classify8021d(skb);
159 return ieee80211_downgrade_queue(local, skb);
162 void ieee80211_set_qos_hdr(struct ieee80211_sub_if_data *sdata,
165 struct ieee80211_hdr *hdr = (void *)skb->data;
166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
168 /* Fill in the QoS header if there is one. */
169 if (ieee80211_is_data_qos(hdr->frame_control)) {
170 u8 *p = ieee80211_get_qos_ctl(hdr);
173 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
175 /* preserve EOSP bit */
176 ack_policy = *p & IEEE80211_QOS_CTL_EOSP;
178 if (is_multicast_ether_addr(hdr->addr1) ||
179 sdata->noack_map & BIT(tid)) {
180 ack_policy |= IEEE80211_QOS_CTL_ACK_POLICY_NOACK;
181 info->flags |= IEEE80211_TX_CTL_NO_ACK;
184 /* qos header is 2 bytes */
185 *p++ = ack_policy | tid;
186 *p = ieee80211_vif_is_mesh(&sdata->vif) ?
187 (IEEE80211_QOS_CTL_MESH_CONTROL_PRESENT >> 8) : 0;