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rt2x00: Only update rssi average approximation on receiving beacon frames. 

Restrict rssi average updating to beacon frames of the bssid the
interface is
associated with. Without this restriction, strong signals belonging to other
BSS, e.g. beacon frames coming from a nearby AP, would cause incorrectly high
rssi approximation values. This would then cause the link tuner to reduce
sensitivity, resulting in transmissions from the BSS associated to to be
missed.

Signed-off-by: Mattias Nissler <mattias.nissler@gmx.de>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Mattias Nissler 2007-11-27 21:50:26 +01:00 committed by David S. Miller
parent d28c2561fb
commit 61af43c56b
2 changed files with 25 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/net/wireless/rt2x00/rt2x00.h
View File

@ -32,6 +32,7 @@
#include <linux/workqueue.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/etherdevice.h>
#include <net/mac80211.h>
@ -149,6 +150,12 @@ static inline int is_probe_resp(u16 fc)
((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP));
}
static inline int is_beacon(u16 fc)
{
return (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) &&
((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON));
}
/*
* Chipset identification
* The chipset on the device is composed of a RT and RF chip.

19
drivers/net/wireless/rt2x00/rt2x00dev.c
View File

@ -526,11 +526,14 @@ void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
struct rxdata_entry_desc *desc)
{
struct rt2x00_dev *rt2x00dev = entry->ring->rt2x00dev;
struct interface *intf = &rt2x00dev->interface;
struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
struct ieee80211_hw_mode *mode;
struct ieee80211_rate *rate;
struct ieee80211_hdr *hdr;
unsigned int i;
int val = 0;
u16 fc;
/*
* Update RX statistics.
@ -555,7 +558,21 @@ void rt2x00lib_rxdone(struct data_entry *entry, struct sk_buff *skb,
}
}
rt2x00lib_update_link_stats(&rt2x00dev->link, desc->rssi);
/*
* Only update link status if this is a beacon frame carrying our
* bssid.
*/
hdr = (struct ieee80211_hdr *) skb->data;
if (skb->len >= sizeof(struct ieee80211_hdr *)) {
fc = le16_to_cpu(hdr->frame_control);
if ((intf->type == IEEE80211_IF_TYPE_STA
|| intf->type == IEEE80211_IF_TYPE_IBSS)
&& is_beacon(fc)
&& compare_ether_addr(hdr->addr3, intf->bssid) == 0)
rt2x00lib_update_link_stats(&rt2x00dev->link,
desc->rssi);
}
rt2x00dev->link.qual.rx_success++;
rx_status->rate = val;