iwlwifi: new debugging feature for dumping data traffic

The traffic buffer will only beallocated and used if either bit 23
(IWL_DX_TX) or bit 24 (IWL_DL_RX) of "debug" is set;
example: "debug=0x800000" - log tx data traffic
         "debug=0x1000000" - log rx data traffic
         "debug=0x1800000" - log both tx and rx traffic

The traffic log will store the beginning portion (64 bytes)  of the
latest 256 of tx and rx packets in the round-robbin buffer for
debugging,
user can examine the log through debugfs file.

How to display the current logged tx/rx traffic and txfifo and rxfifo
read/write point:
"cat traffic_log" in /sys/kernel/debug/ieee80211/phy0/iwlagn/debug
directory

By echo "0" to traffic_log file will empty the traffic log buffer and
reset both tx and rx taffic log index to 0.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-debug.h b/drivers/net/wireless/iwlwifi/iwl-debug.h
index 09af046927ab..335ff5c43966 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debug.h
+++ b/drivers/net/wireless/iwlwifi/iwl-debug.h
@@ -72,6 +72,7 @@ struct iwl_debugfs {
 	const char *name;
 	struct dentry *dir_drv;
 	struct dentry *dir_data;
+	struct dentry *dir_debug;
 	struct dentry *dir_rf;
 	struct dir_data_files {
 		struct dentry *file_sram;
@@ -95,6 +96,9 @@ struct iwl_debugfs {
 		struct dentry *file_disable_chain_noise;
 		struct dentry *file_disable_tx_power;
 	} dbgfs_rf_files;
+	struct dir_debug_files {
+		struct dentry *file_traffic_log;
+	} dbgfs_debug_files;
 	u32 sram_offset;
 	u32 sram_len;
 };