iwlwifi: mvm: add trigger for firmware dump upon statistics

It can be very useful to monitor the statistics and trigger
a firmware dump when a certain value hits a certain offset.
Since the statistics are huge, add a generic trigger. When
the DWORD at offset X reaches value Y.

Since there is another trigger before this one I can't add
right now because of a dependency on mac80211, add a
reserved entry to keep the enum in place.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

3 files changed, 48 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h b/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h
index 1d5195b4aad2..95bef179ddc1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h
+++ b/drivers/net/wireless/iwlwifi/iwl-fw-error-dump.h
@@ -246,6 +246,8 @@ iwl_fw_error_next_data(struct iwl_fw_error_dump_data *data)
  * @FW_DBG_TRIGGER_CHANNEL_SWITCH: trigger log collection upon channel switch.
  * @FW_DBG_TRIGGER_FW_NOTIF: trigger log collection when the firmware sends a
  *      command response or a notification.
+ * @FW_DB_TRIGGER_RESERVED: reserved
+ * @FW_DBG_TRIGGER_STATS: trigger log collection upon statistics threshold.
  */
 enum iwl_fw_dbg_trigger {
         FW_DBG_TRIGGER_INVALID = 0,
@@ -254,6 +256,8 @@ enum iwl_fw_dbg_trigger {
         FW_DBG_TRIGGER_MISSED_BEACONS,
         FW_DBG_TRIGGER_CHANNEL_SWITCH,
         FW_DBG_TRIGGER_FW_NOTIF,
+        FW_DB_TRIGGER_RESERVED,
+        FW_DBG_TRIGGER_STATS,
 
         /* must be last */
         FW_DBG_TRIGGER_MAX,
diff --git a/drivers/net/wireless/iwlwifi/iwl-fw-file.h b/drivers/net/wireless/iwlwifi/iwl-fw-file.h
index 49388c290704..de0e96d76fa3 100644
--- a/drivers/net/wireless/iwlwifi/iwl-fw-file.h
+++ b/drivers/net/wireless/iwlwifi/iwl-fw-file.h
@@ -552,6 +552,20 @@ struct iwl_fw_dbg_trigger_cmd {
 } __packed;
 
 /**
+ * iwl_fw_dbg_trigger_stats - configures trigger for statistics
+ * @stop_offset: the offset of the value to be monitored
+ * @stop_threshold: the threshold above which to collect
+ * @start_offset: the offset of the value to be monitored
+ * @start_threshold: the threshold above which to start recording
+ */
+struct iwl_fw_dbg_trigger_stats {
+        __le32 stop_offset;
+        __le32 stop_threshold;
+        __le32 start_offset;
+        __le32 start_threshold;
+} __packed;
+
+/**
  * struct iwl_fw_dbg_conf_tlv - a TLV that describes a debug configuration.
  * @id: conf id
  * @usniffer: should the uSniffer image be used
diff --git a/drivers/net/wireless/iwlwifi/mvm/rx.c b/drivers/net/wireless/iwlwifi/mvm/rx.c
index b86ff66ee0ce..9b2c537b5e95 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rx.c
@@ -508,6 +508,34 @@ static void iwl_mvm_stat_iterator(void *_data, u8 *mac,
         }
 }
 
+static inline void
+iwl_mvm_rx_stats_check_trigger(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
+{
+        struct iwl_fw_dbg_trigger_tlv *trig;
+        struct iwl_fw_dbg_trigger_stats *trig_stats;
+        u32 trig_offset, trig_thold;
+
+        if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_STATS))
+                return;
+
+        trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_STATS);
+        trig_stats = (void *)trig->data;
+
+        if (!iwl_fw_dbg_trigger_check_stop(mvm, NULL, trig))
+                return;
+
+        trig_offset = le32_to_cpu(trig_stats->stop_offset);
+        trig_thold = le32_to_cpu(trig_stats->stop_threshold);
+
+        if (WARN_ON_ONCE(trig_offset >= iwl_rx_packet_payload_len(pkt)))
+                return;
+
+        if (le32_to_cpup((__le32 *) (pkt->data + trig_offset)) < trig_thold)
+                return;
+
+        iwl_mvm_fw_dbg_collect_trig(mvm, trig, NULL, 0);
+}
+
 void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
                                   struct iwl_rx_packet *pkt)
 {
@@ -553,6 +581,8 @@ void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
                 iwl_mvm_update_rx_statistics(mvm, &stats->rx);
         }
 
+        iwl_mvm_rx_stats_check_trigger(mvm, pkt);
+
         /* Only handle rx statistics temperature changes if async temp
          * notifications are not supported
          */