mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-16 05:50:19 +00:00
172128468f
There's a redundant rcu_read_lock/unlock pair, a redundant variable, and a few redundant accesses to the 1d_to_ac array. Fix this to make the code neater and easier to follow. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
161 lines
3.7 KiB
C
161 lines
3.7 KiB
C
/*
|
|
* 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"
|
|
|
|
/* Default mapping in classifier to work with default
|
|
* queue setup.
|
|
*/
|
|
const int ieee802_1d_to_ac[8] = {
|
|
IEEE80211_AC_BE,
|
|
IEEE80211_AC_BK,
|
|
IEEE80211_AC_BK,
|
|
IEEE80211_AC_BE,
|
|
IEEE80211_AC_VI,
|
|
IEEE80211_AC_VI,
|
|
IEEE80211_AC_VO,
|
|
IEEE80211_AC_VO
|
|
};
|
|
|
|
static 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;
|
|
}
|
|
}
|
|
|
|
|
|
/* Indicate which queue to use. */
|
|
u16 ieee80211_select_queue(struct ieee80211_sub_if_data *sdata,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta = NULL;
|
|
const u8 *ra = NULL;
|
|
bool qos = false;
|
|
|
|
if (local->hw.queues < 4 || skb->len < 6) {
|
|
skb->priority = 0; /* required for correct WPA/11i MIC */
|
|
return min_t(u16, local->hw.queues - 1, IEEE80211_AC_BE);
|
|
}
|
|
|
|
rcu_read_lock();
|
|
switch (sdata->vif.type) {
|
|
case NL80211_IFTYPE_AP_VLAN:
|
|
sta = rcu_dereference(sdata->u.vlan.sta);
|
|
if (sta) {
|
|
qos = get_sta_flags(sta) & WLAN_STA_WME;
|
|
break;
|
|
}
|
|
case NL80211_IFTYPE_AP:
|
|
ra = skb->data;
|
|
break;
|
|
case NL80211_IFTYPE_WDS:
|
|
ra = sdata->u.wds.remote_addr;
|
|
break;
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
/*
|
|
* XXX: This is clearly broken ... but already was before,
|
|
* because ieee80211_fill_mesh_addresses() would clear A1
|
|
* except for multicast addresses.
|
|
*/
|
|
break;
|
|
#endif
|
|
case NL80211_IFTYPE_STATION:
|
|
ra = sdata->u.mgd.bssid;
|
|
break;
|
|
case NL80211_IFTYPE_ADHOC:
|
|
ra = skb->data;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (!sta && ra && !is_multicast_ether_addr(ra)) {
|
|
sta = sta_info_get(sdata, ra);
|
|
if (sta)
|
|
qos = get_sta_flags(sta) & WLAN_STA_WME;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!qos) {
|
|
skb->priority = 0; /* required for correct WPA/11i MIC */
|
|
return IEEE80211_AC_BE;
|
|
}
|
|
|
|
/* use the data classifier to determine what 802.1d tag the
|
|
* data frame has */
|
|
skb->priority = cfg80211_classify8021d(skb);
|
|
|
|
return ieee80211_downgrade_queue(local, skb);
|
|
}
|
|
|
|
u16 ieee80211_downgrade_queue(struct ieee80211_local *local,
|
|
struct sk_buff *skb)
|
|
{
|
|
/* in case 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)) {
|
|
/*
|
|
* This should not really happen. The AP has marked all
|
|
* lower ACs to require admission control which is not
|
|
* a reasonable configuration. Allow the frame to be
|
|
* transmitted using AC_BK as a workaround.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* look up which queue to use for frames with this 1d tag */
|
|
return ieee802_1d_to_ac[skb->priority];
|
|
}
|
|
|
|
void ieee80211_set_qos_hdr(struct ieee80211_local *local, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_hdr *hdr = (void *)skb->data;
|
|
|
|
/* Fill in the QoS header if there is one. */
|
|
if (ieee80211_is_data_qos(hdr->frame_control)) {
|
|
u8 *p = ieee80211_get_qos_ctl(hdr);
|
|
u8 ack_policy = 0, tid;
|
|
|
|
tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
|
|
|
|
if (unlikely(local->wifi_wme_noack_test))
|
|
ack_policy |= QOS_CONTROL_ACK_POLICY_NOACK <<
|
|
QOS_CONTROL_ACK_POLICY_SHIFT;
|
|
/* qos header is 2 bytes, second reserved */
|
|
*p++ = ack_policy | tid;
|
|
*p = 0;
|
|
}
|
|
}
|