wifi: iwlwifi: refactor RX tracing

When there's not going to be any data in the data event, we
don't need to add it at all (unlike the TX version, it has
no data at all.)

Also combine the tracing into a separate inline so we only
call iwl_rx_trace_len() once, which also simplifies things,
and lets us have a single place to later add other checks.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20231207044813.13325a4848d2.Ic9e7d794fc4aebfe5ac5136b539ee62789f210f3@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-devtrace-data.h

@@ -3,7 +3,7 @@
  *
  * Copyright(c) 2009 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2015        Intel Deutschland GmbH
- * Copyright(c) 2018 - 2019 Intel Corporation
+ * Copyright(c) 2018 - 2019, 2023 Intel Corporation
  *****************************************************************************/
 
 #if !defined(__IWLWIFI_DEVICE_TRACE_DATA) || defined(TRACE_HEADER_MULTI_READ)
@@ -36,20 +36,17 @@ TRACE_EVENT(iwlwifi_dev_tx_tb,
 
 TRACE_EVENT(iwlwifi_dev_rx_data,
 	TP_PROTO(const struct device *dev,
-		 const struct iwl_trans *trans,
-		 void *rxbuf, size_t len),
-	TP_ARGS(dev, trans, rxbuf, len),
+		 void *rxbuf, size_t len, size_t start),
+	TP_ARGS(dev, rxbuf, len, start),
 	TP_STRUCT__entry(
 		DEV_ENTRY
-		__dynamic_array(u8, data,
-				len - iwl_rx_trace_len(trans, rxbuf, len, NULL))
+		__dynamic_array(u8, data, len - start)
 	),
 	TP_fast_assign(
-		size_t offs = iwl_rx_trace_len(trans, rxbuf, len, NULL);
 		DEV_ASSIGN;
-		if (offs < len)
+		if (start < len)
 			memcpy(__get_dynamic_array(data),
-			       ((u8 *)rxbuf) + offs, len - offs);
+			       ((u8 *)rxbuf) + start, len - start);
 	),
 	TP_printk("[%s] RX frame data", __get_str(dev))
 );

drivers/net/wireless/intel/iwlwifi/iwl-devtrace-iwlwifi.h

@@ -4,7 +4,7 @@
  * Copyright(c) 2009 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2015 Intel Mobile Communications GmbH
  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
- * Copyright(c) 2018        Intel Corporation
+ * Copyright(c) 2018, 2023  Intel Corporation
  *****************************************************************************/
 
 #if !defined(__IWLWIFI_DEVICE_TRACE_IWLWIFI) || defined(TRACE_HEADER_MULTI_READ)
@@ -50,23 +50,20 @@ TRACE_EVENT(iwlwifi_dev_hcmd,
 );
 
 TRACE_EVENT(iwlwifi_dev_rx,
-	TP_PROTO(const struct device *dev, const struct iwl_trans *trans,
-		 struct iwl_rx_packet *pkt, size_t len),
-	TP_ARGS(dev, trans, pkt, len),
+	TP_PROTO(const struct device *dev,
+		 struct iwl_rx_packet *pkt, size_t len, size_t trace_len,
+		 size_t hdr_offset),
+	TP_ARGS(dev, pkt, len, trace_len, hdr_offset),
 	TP_STRUCT__entry(
 		DEV_ENTRY
 		__field(u16, cmd)
 		__field(u8, hdr_offset)
-		__dynamic_array(u8, rxbuf,
-				iwl_rx_trace_len(trans, pkt, len, NULL))
+		__dynamic_array(u8, rxbuf, trace_len)
 	),
 	TP_fast_assign(
-		size_t hdr_offset = 0;
-
 		DEV_ASSIGN;
 		__entry->cmd = WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd);
-		memcpy(__get_dynamic_array(rxbuf), pkt,
-		       iwl_rx_trace_len(trans, pkt, len, &hdr_offset));
+		memcpy(__get_dynamic_array(rxbuf), pkt, trace_len);
 		__entry->hdr_offset = hdr_offset;
 	),
 	TP_printk("[%s] RX cmd %#.2x",

drivers/net/wireless/intel/iwlwifi/iwl-devtrace.c

@@ -2,7 +2,7 @@
 /******************************************************************************
  *
  * Copyright(c) 2009 - 2014 Intel Corporation. All rights reserved.
- * Copyright (C) 2018 Intel Corporation
+ * Copyright (C) 2018, 2023 Intel Corporation
  *****************************************************************************/
 
 #include <linux/module.h>
@@ -20,4 +20,17 @@
 EXPORT_TRACEPOINT_SYMBOL(iwlwifi_dev_ucode_event);
 EXPORT_TRACEPOINT_SYMBOL(iwlwifi_dev_ucode_cont_event);
 EXPORT_TRACEPOINT_SYMBOL(iwlwifi_dev_ucode_wrap_event);
-#endif
+#else
+#include "iwl-devtrace.h"
+#endif /* __CHECKER__ */
+
+void __trace_iwlwifi_dev_rx(struct iwl_trans *trans, void *pkt, size_t len)
+{
+	size_t hdr_offset = 0, trace_len;
+
+	trace_len = iwl_rx_trace_len(trans, pkt, len, &hdr_offset);
+	trace_iwlwifi_dev_rx(trans->dev, pkt, len, trace_len, hdr_offset);
+
+	if (trace_len < len)
+		trace_iwlwifi_dev_rx_data(trans->dev, pkt, len, trace_len);
+}

drivers/net/wireless/intel/iwlwifi/iwl-devtrace.h

@@ -7,12 +7,12 @@
  *****************************************************************************/
 
 #ifndef __IWLWIFI_DEVICE_TRACE
+#define __IWLWIFI_DEVICE_TRACE
 #include <linux/skbuff.h>
 #include <linux/ieee80211.h>
 #include <net/cfg80211.h>
 #include <net/mac80211.h>
 #include "iwl-trans.h"
-#if !defined(__IWLWIFI_DEVICE_TRACE)
 static inline bool iwl_trace_data(struct sk_buff *skb)
 {
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
@@ -70,9 +70,6 @@ static inline size_t iwl_rx_trace_len(const struct iwl_trans *trans,
 	return sizeof(__le32) + sizeof(*cmd) + trans->rx_mpdu_cmd_hdr_size +
 		ieee80211_hdrlen(hdr->frame_control);
 }
-#endif
-
-#define __IWLWIFI_DEVICE_TRACE
 
 #include <linux/tracepoint.h>
 #include <linux/device.h>
@@ -98,4 +95,20 @@ static inline void trace_ ## name(proto) {}
 #include "iwl-devtrace-data.h"
 #include "iwl-devtrace-iwlwifi.h"
 
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+DECLARE_TRACEPOINT(iwlwifi_dev_rx);
+DECLARE_TRACEPOINT(iwlwifi_dev_rx_data);
+#endif
+
+void __trace_iwlwifi_dev_rx(struct iwl_trans *trans, void *pkt, size_t len);
+
+static inline void maybe_trace_iwlwifi_dev_rx(struct iwl_trans *trans,
+					      void *pkt, size_t len)
+{
+#ifdef CONFIG_IWLWIFI_DEVICE_TRACING
+	if (tracepoint_enabled(iwlwifi_dev_rx) ||
+	    tracepoint_enabled(iwlwifi_dev_rx_data))
+		__trace_iwlwifi_dev_rx(trans, pkt, len);
+#endif
+}
 #endif /* __IWLWIFI_DEVICE_TRACE */

drivers/net/wireless/intel/iwlwifi/pcie/rx.c

@@ -1351,8 +1351,7 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
 		if (len < sizeof(*pkt) || offset > max_len)
 			break;
 
-		trace_iwlwifi_dev_rx(trans->dev, trans, pkt, len);
-		trace_iwlwifi_dev_rx_data(trans->dev, trans, pkt, len);
+		maybe_trace_iwlwifi_dev_rx(trans, pkt, len);
 
 		/* Reclaim a command buffer only if this packet is a response
 		 *   to a (driver-originated) command.