iwlwifi: add num_of_sos_stats to statistics counter

When uCode detects number of beacon missed consecutively above the
internal missed beacon threshold (set by uCode), it will reset and
re-tune the radio in order to get out of bad PHY state.

This "num_of_sos_states" counter monitors number of time uCode
encounters this bad condition and has to re-tune the radio.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@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>

2 files changed, 13 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index 3320cce3d57b..8dc34a3d4f7e 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -3095,7 +3095,12 @@ struct statistics_general {
         __le32 ttl_timestamp;
         struct statistics_div div;
         __le32 rx_enable_counter;
-        __le32 reserved1;
+        /*
+         * num_of_sos_states:
+         *  count the number of times we have to re-tune
+         *  in order to get out of bad PHY status
+         */
+        __le32 num_of_sos_states;
         __le32 reserved2;
         __le32 reserved3;
 } __attribute__ ((packed));
diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 2264cbd95a00..19c7fab47939 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -1728,7 +1728,7 @@ static ssize_t iwl_dbgfs_ucode_general_stats_read(struct file *file,
         struct iwl_priv *priv = file->private_data;
         int pos = 0;
         char *buf;
-        int bufsz = sizeof(struct statistics_general) * 8 + 250;
+        int bufsz = sizeof(struct statistics_general) * 10 + 300;
         ssize_t ret;
         struct statistics_general *general, *accum_general;
         struct statistics_general *delta_general, *max_general;
@@ -1828,6 +1828,12 @@ static ssize_t iwl_dbgfs_ucode_general_stats_read(struct file *file,
                          accum_general->rx_enable_counter,
                          delta_general->rx_enable_counter,
                          max_general->rx_enable_counter);
+        pos += scnprintf(buf + pos, bufsz - pos, ucode_stats_format,
+                         "num_of_sos_states:",
+                         le32_to_cpu(general->num_of_sos_states),
+                         accum_general->num_of_sos_states,
+                         delta_general->num_of_sos_states,
+                         max_general->num_of_sos_states);
         ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
         kfree(buf);
         return ret;