From 1db5950f1d0b82e07371b211a48317b8972da063 Mon Sep 17 00:00:00 2001 From: Trieu 'Andrew' Nguyen Date: Wed, 10 Feb 2010 10:27:34 -0800 Subject: iwlwifi: Monitor and recover the aggregation TX flow failure This change monitors the tx statistics to detect the drop in throughput. When the throughput drops, the ratio of the actual_ack_count and the expected_ ack_count also drops. At the same time, the aggregated ba_timeout (the number of ba timeout retries) also rises. If the actual_ack_count/expected_ack_count ratio is 0 and the number of ba timeout retries rises to 16, no tx packets (tcp, udp, or ping - icmp) can be delivered. The driver recovers from this situation by reseting the uCode firmware. If the actual_ack_count/expected_ ack_count ratio drops below 50% (but not 0) and the aggregated ba_timeout retries just exceed 5 (but not 16), then the driver can reset the radio to bring the throughput up. Signed-off-by: Trieu 'Andrew' Nguyen Signed-off-by: Reinette Chatre --- drivers/net/wireless/iwlwifi/iwl-dev.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/net/wireless/iwlwifi/iwl-dev.h') diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h index 71cf1558e640..f81317d478ee 100644 --- a/drivers/net/wireless/iwlwifi/iwl-dev.h +++ b/drivers/net/wireless/iwlwifi/iwl-dev.h @@ -1072,6 +1072,9 @@ struct iwl_priv { /* storing the jiffies when the plcp error rate is received */ unsigned long plcp_jiffies; + /* reporting the number of tids has AGG on. 0 means no AGGREGATION */ + u8 agg_tids_count; + /* force reset */ unsigned long last_force_reset_jiffies; -- cgit v1.2.1