146 lines
3.6 KiB
C
146 lines
3.6 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] = { 2, 3, 3, 2, 1, 1, 0, 0 };
|
|
|
|
static const char llc_ip_hdr[8] = {0xAA, 0xAA, 0x3, 0, 0, 0, 0x08, 0};
|
|
|
|
/* Given a data frame determine the 802.1p/1d tag to use. */
|
|
static unsigned int classify_1d(struct sk_buff *skb)
|
|
{
|
|
unsigned int dscp;
|
|
|
|
/* 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;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
dscp = ip_hdr(skb)->tos & 0xfc;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return dscp >> 5;
|
|
}
|
|
|
|
|
|
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. */
|
|
static u16 classify80211(struct ieee80211_local *local, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
|
|
if (!ieee80211_is_data(hdr->frame_control)) {
|
|
/* management frames go on AC_VO queue, but are sent
|
|
* without QoS control fields */
|
|
return 0;
|
|
}
|
|
|
|
if (0 /* injected */) {
|
|
/* use AC from radiotap */
|
|
}
|
|
|
|
if (!ieee80211_is_data_qos(hdr->frame_control)) {
|
|
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);
|
|
|
|
/* 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];
|
|
}
|
|
|
|
u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_master_priv *mpriv = netdev_priv(dev);
|
|
struct ieee80211_local *local = mpriv->local;
|
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
u16 queue;
|
|
u8 tid;
|
|
|
|
queue = classify80211(local, skb);
|
|
if (unlikely(queue >= local->hw.queues))
|
|
queue = local->hw.queues - 1;
|
|
|
|
/*
|
|
* Now we know the 1d priority, fill in the QoS header if
|
|
* there is one (and we haven't done this before).
|
|
*/
|
|
if (!skb->requeue && ieee80211_is_data_qos(hdr->frame_control)) {
|
|
u8 *p = ieee80211_get_qos_ctl(hdr);
|
|
u8 ack_policy = 0;
|
|
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;
|
|
}
|
|
|
|
return queue;
|
|
}
|