iwlwifi: format and show statistics counter from uCode

To help debug uCode related problem, adding "delta" and "max"
information in debugfs statistics counters display.

Those information show the delta between two statistics report from
uCode, user can monitor the counters for any "un-normal" behavior.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Jay Sternberg<jay.e.sternberg@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 3 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index 10db97327452..5bbe5f1f749c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -564,15 +564,24 @@ static void iwl_accumulative_statistics(struct iwl_priv *priv,
         int i;
         __le32 *prev_stats;
         u32 *accum_stats;
+        u32 *delta, *max_delta;
 
         prev_stats = (__le32 *)&priv->statistics;
         accum_stats = (u32 *)&priv->accum_statistics;
+        delta = (u32 *)&priv->delta_statistics;
+        max_delta = (u32 *)&priv->max_delta;
 
         for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
-             i += sizeof(__le32), stats++, prev_stats++, accum_stats++)
-                if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats))
-                        *accum_stats += (le32_to_cpu(*stats) -
+             i += sizeof(__le32), stats++, prev_stats++, delta++,
+             max_delta++, accum_stats++) {
+                if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
+                        *delta = (le32_to_cpu(*stats) -
                                 le32_to_cpu(*prev_stats));
+                        *accum_stats += *delta;
+                        if (*delta > *max_delta)
+                                *max_delta = *delta;
+                }
+        }
 
         /* reset accumulative statistics for "no-counter" type statistics */
         priv->accum_statistics.general.temperature =
@@ -641,6 +650,10 @@ void iwl_reply_statistics(struct iwl_priv *priv,
 #ifdef CONFIG_IWLWIFI_DEBUG
                 memset(&priv->accum_statistics, 0,
                         sizeof(struct iwl_notif_statistics));
+                memset(&priv->delta_statistics, 0,
+                        sizeof(struct iwl_notif_statistics));
+                memset(&priv->max_delta, 0,
+                        sizeof(struct iwl_notif_statistics));
 #endif
                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
         }