iwlagn: Enable/disable PS poll based on RSSI and BT coex traffic state
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>
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 8a2edf8..ee25637 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -1931,6 +1931,9 @@
/* 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