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iwlagn: Enable/disable PS poll based on RSSI and BT coex traffic state

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WiFi throughput drops drastically when BT is turned on, BT and WiFi
are simultaneously transmitting/receiving traffic. This is particularly true
when BT has higher priority over WiFi, and hence the device defers TX frames.
The AP assumes that the channel is bad and reduces the data rate, implying
longer airtime, which exacerbates the problem further, resulting ultimately
in what is popularly called the "death-spiral" phenomenon. The use of PS-poll
in such scenarios guarantees a low but consistent throughput.

Since the death-spiral phenomenon is observed only when the RSSI is low, use
PS-poll only when RSSI is low and disable when high, with a known hysterisis.

This feature specifies the high and low thresholds and implements the
callbacks registered with mac80211, which will be called when threshold events
occur.

iwlwifi: dynamic pspoll: optimize rssi monitor code

Signed-off-by: Meenakshi Venkataraman <meenakshi.venkataraman@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Meenakshi Venkataraman
2011-07-08 08:46:23 -07:00
committed by John W. Linville
parent 615f7b9bb1
commit 207ecc5eab
6 changed files with 150 additions and 2 deletions
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3
drivers/net/wireless/iwlwifi/iwl-commands.h
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@ -1931,6 +1931,9 @@ struct iwl_bt_cmd {
/* Disable Sync PSPoll on SCO/eSCO */
#define IWLAGN_BT_FLAG_SYNC_2_BT_DISABLE BIT(7)
#define IWLAGN_BT_PSP_MIN_RSSI_THRESHOLD -75 /* dBm */
#define IWLAGN_BT_PSP_MAX_RSSI_THRESHOLD -65 /* dBm */
#define IWLAGN_BT_PRIO_BOOST_MAX 0xFF
#define IWLAGN_BT_PRIO_BOOST_MIN 0x00
#define IWLAGN_BT_PRIO_BOOST_DEFAULT 0xF0